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[linux-2.6-block.git] / arch / i386 / kernel / apm.c
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1da177e4
LT		 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 replacment 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 complier/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@suse.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@redhat.com>).
164 * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
165 * calling it - instead idle. (Alan Cox <alan@redhat.com>)
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 via anonymous ftp from
193 * ftp://ftp.intel.com/pub/IAL/software_specs/apmv11.doc. 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:
3f4b23e9 201 * http://www.microsoft.com/whdc/archive/amp_12.mspx]
1da177e4
LT		 202 */
203
1da177e4
LT		 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/miscdevice.h>
215#include <linux/apm_bios.h>
216#include <linux/init.h>
217#include <linux/time.h>
218#include <linux/sched.h>
219#include <linux/pm.h>
bca73e4b 220#include <linux/pm_legacy.h>
a9415644 221#include <linux/capability.h>
1da177e4
LT		 222#include <linux/device.h>
223#include <linux/kernel.h>
224#include <linux/smp.h>
225#include <linux/smp_lock.h>
226#include <linux/dmi.h>
227#include <linux/suspend.h>
fc09561d 228#include <linux/kthread.h>
1da177e4
LT		 229
230#include <asm/system.h>
231#include <asm/uaccess.h>
232#include <asm/desc.h>
306e440d 233#include <asm/i8253.h>
6020c8f3 234#include <asm/paravirt.h>
1da177e4
LT		 235
236#include "io_ports.h"
237
1da177e4
LT		 238extern unsigned long get_cmos_time(void);
239extern void machine_real_restart(unsigned char *, int);
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 "apm.h"
306
1da177e4
LT		 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;
77617bd8
DP		 341 unsigned int suser: 1;
342 unsigned int writer: 1;
343 unsigned int reader: 1;
344 unsigned int suspend_wait: 1;
1da177e4
LT		 345 int suspend_result;
346 int suspends_pending;
347 int standbys_pending;
348 int suspends_read;
349 int standbys_read;
350 int event_head;
351 int event_tail;
352 apm_event_t events[APM_MAX_EVENTS];
353};
354
355/*
356 * The magic number in apm_user
357 */
358#define APM_BIOS_MAGIC 0x4101
359
360/*
361 * idle percentage above which bios idle calls are done
362 */
363#ifdef CONFIG_APM_CPU_IDLE
364#define DEFAULT_IDLE_THRESHOLD 95
365#else
366#define DEFAULT_IDLE_THRESHOLD 100
367#endif
368#define DEFAULT_IDLE_PERIOD (100 / 3)
369
370/*
371 * Local variables
372 */
373static struct {
374 unsigned long offset;
375 unsigned short segment;
376} apm_bios_entry;
377static int clock_slowed;
87af2ffd
AM		 378static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
379static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
1da177e4
LT		 380static int set_pm_idle;
381static int suspends_pending;
382static int standbys_pending;
383static int ignore_sys_suspend;
384static int ignore_normal_resume;
87af2ffd 385static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
1da177e4
LT		 386
387#ifdef CONFIG_APM_RTC_IS_GMT
388# define clock_cmos_diff 0
389# define got_clock_diff 1
390#else
391static long clock_cmos_diff;
392static int got_clock_diff;
393#endif
87af2ffd
AM		 394static int debug __read_mostly;
395static int smp __read_mostly;
1da177e4
LT		 396static int apm_disabled = -1;
397#ifdef CONFIG_SMP
398static int power_off;
399#else
400static int power_off = 1;
401#endif
402#ifdef CONFIG_APM_REAL_MODE_POWER_OFF
403static int realmode_power_off = 1;
404#else
405static int realmode_power_off;
406#endif
1da177e4
LT		 407#ifdef CONFIG_APM_ALLOW_INTS
408static int allow_ints = 1;
409#else
410static int allow_ints;
411#endif
412static int broken_psr;
413
414static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
415static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
416static struct apm_user * user_list;
417static DEFINE_SPINLOCK(user_list_lock);
87af2ffd 418static const struct desc_struct bad_bios_desc = { 0, 0x00409200 };
1da177e4 419
87af2ffd 420static const char driver_version[] = "1.16ac"; /* no spaces */
1da177e4 421
fc09561d
SH		 422static struct task_struct *kapmd_task;
423
1da177e4
LT		 424/*
425 * APM event names taken from the APM 1.2 specification. These are
426 * the message codes that the BIOS uses to tell us about events
427 */
87af2ffd 428static const char * const apm_event_name[] = {
1da177e4
LT		 429 "system standby",
430 "system suspend",
431 "normal resume",
432 "critical resume",
433 "low battery",
434 "power status change",
435 "update time",
436 "critical suspend",
437 "user standby",
438 "user suspend",
439 "system standby resume",
440 "capabilities change"
441};
38e548ee 442#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
1da177e4
LT		 443
444typedef struct lookup_t {
445 int key;
446 char * msg;
447} lookup_t;
448
449/*
450 * The BIOS returns a set of standard error codes in AX when the
451 * carry flag is set.
452 */
453
454static const lookup_t error_table[] = {
455/* N/A { APM_SUCCESS, "Operation succeeded" }, */
456 { APM_DISABLED, "Power management disabled" },
457 { APM_CONNECTED, "Real mode interface already connected" },
458 { APM_NOT_CONNECTED, "Interface not connected" },
459 { APM_16_CONNECTED, "16 bit interface already connected" },
460/* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
461 { APM_32_CONNECTED, "32 bit interface already connected" },
462 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
463 { APM_BAD_DEVICE, "Unrecognized device ID" },
464 { APM_BAD_PARAM, "Parameter out of range" },
465 { APM_NOT_ENGAGED, "Interface not engaged" },
466 { APM_BAD_FUNCTION, "Function not supported" },
467 { APM_RESUME_DISABLED, "Resume timer disabled" },
468 { APM_BAD_STATE, "Unable to enter requested state" },
469/* N/A { APM_NO_EVENTS, "No events pending" }, */
470 { APM_NO_ERROR, "BIOS did not set a return code" },
471 { APM_NOT_PRESENT, "No APM present" }
472};
38e548ee 473#define ERROR_COUNT ARRAY_SIZE(error_table)
1da177e4
LT		 474
475/**
476 * apm_error - display an APM error
477 * @str: information string
478 * @err: APM BIOS return code
479 *
480 * Write a meaningful log entry to the kernel log in the event of
481 * an APM error.
482 */
483
484static void apm_error(char *str, int err)
485{
486 int i;
487
488 for (i = 0; i < ERROR_COUNT; i++)
489 if (error_table[i].key == err) break;
490 if (i < ERROR_COUNT)
491 printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
492 else
493 printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
494 str, err);
495}
496
497/*
498 * Lock APM functionality to physical CPU 0
499 */
500
501#ifdef CONFIG_SMP
502
503static cpumask_t apm_save_cpus(void)
504{
505 cpumask_t x = current->cpus_allowed;
506 /* Some bioses don't like being called from CPU != 0 */
507 set_cpus_allowed(current, cpumask_of_cpu(0));
508 BUG_ON(smp_processor_id() != 0);
509 return x;
510}
511
512static inline void apm_restore_cpus(cpumask_t mask)
513{
514 set_cpus_allowed(current, mask);
515}
516
517#else
518
519/*
520 * No CPU lockdown needed on a uniprocessor
521 */
522
523#define apm_save_cpus() (current->cpus_allowed)
524#define apm_restore_cpus(x) (void)(x)
525
526#endif
527
528/*
529 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
530 * apm_info.allow_ints, we are being really paranoid here! Not only
531 * are interrupts disabled, but all the segment registers (except SS)
532 * are saved and zeroed this means that if the BIOS tries to reference
533 * any data without explicitly loading the segment registers, the kernel
534 * will fault immediately rather than have some unforeseen circumstances
535 * for the rest of the kernel. And it will be very obvious! :-) Doing
536 * this depends on CS referring to the same physical memory as DS so that
537 * DS can be zeroed before the call. Unfortunately, we can't do anything
538 * about the stack segment/pointer. Also, we tell the compiler that
539 * everything could change.
540 *
541 * Also, we KNOW that for the non error case of apm_bios_call, there
542 * is no useful data returned in the low order 8 bits of eax.
543 */
3864c489
PZ		 544
545static inline unsigned long __apm_irq_save(void)
546{
547 unsigned long flags;
548 local_save_flags(flags);
549 if (apm_info.allow_ints) {
550 if (irqs_disabled_flags(flags))
551 local_irq_enable();
552 } else
553 local_irq_disable();
554
555 return flags;
556}
557
558#define apm_irq_save(flags) \
559 do { flags = __apm_irq_save(); } while (0)
560
561static inline void apm_irq_restore(unsigned long flags)
562{
563 if (irqs_disabled_flags(flags))
1da177e4 564 local_irq_disable();
3864c489
PZ		 565 else if (irqs_disabled())
566 local_irq_enable();
567}
1da177e4
LT		 568
569#ifdef APM_ZERO_SEGS
570# define APM_DECL_SEGS \
571 unsigned int saved_fs; unsigned int saved_gs;
572# define APM_DO_SAVE_SEGS \
573 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
574# define APM_DO_RESTORE_SEGS \
575 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
576#else
577# define APM_DECL_SEGS
578# define APM_DO_SAVE_SEGS
579# define APM_DO_RESTORE_SEGS
580#endif
581
582/**
583 * apm_bios_call - Make an APM BIOS 32bit call
584 * @func: APM function to execute
585 * @ebx_in: EBX register for call entry
586 * @ecx_in: ECX register for call entry
587 * @eax: EAX register return
588 * @ebx: EBX register return
589 * @ecx: ECX register return
590 * @edx: EDX register return
591 * @esi: ESI register return
592 *
593 * Make an APM call using the 32bit protected mode interface. The
594 * caller is responsible for knowing if APM BIOS is configured and
595 * enabled. This call can disable interrupts for a long period of
596 * time on some laptops. The return value is in AH and the carry
597 * flag is loaded into AL. If there is an error, then the error
598 * code is returned in AH (bits 8-15 of eax) and this function
599 * returns non-zero.
600 */
601
602static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in,
603 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi)
604{
605 APM_DECL_SEGS
606 unsigned long flags;
607 cpumask_t cpus;
608 int cpu;
609 struct desc_struct save_desc_40;
251e6912 610 struct desc_struct *gdt;
1da177e4
LT		 611
612 cpus = apm_save_cpus();
613
614 cpu = get_cpu();
251e6912
ZA		 615 gdt = get_cpu_gdt_table(cpu);
616 save_desc_40 = gdt[0x40 / 8];
617 gdt[0x40 / 8] = bad_bios_desc;
1da177e4 618
3864c489 619 apm_irq_save(flags);
1da177e4
LT		 620 APM_DO_SAVE_SEGS;
621 apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi);
622 APM_DO_RESTORE_SEGS;
3864c489 623 apm_irq_restore(flags);
251e6912 624 gdt[0x40 / 8] = save_desc_40;
1da177e4
LT		 625 put_cpu();
626 apm_restore_cpus(cpus);
627
628 return *eax & 0xff;
629}
630
631/**
632 * apm_bios_call_simple - make a simple APM BIOS 32bit call
633 * @func: APM function to invoke
634 * @ebx_in: EBX register value for BIOS call
635 * @ecx_in: ECX register value for BIOS call
636 * @eax: EAX register on return from the BIOS call
637 *
87af2ffd 638 * Make a BIOS call that returns one value only, or just status.
1da177e4
LT		 639 * If there is an error, then the error code is returned in AH
640 * (bits 8-15 of eax) and this function returns non-zero. This is
641 * used for simpler BIOS operations. This call may hold interrupts
642 * off for a long time on some laptops.
643 */
644
645static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax)
646{
647 u8 error;
648 APM_DECL_SEGS
649 unsigned long flags;
650 cpumask_t cpus;
651 int cpu;
652 struct desc_struct save_desc_40;
251e6912 653 struct desc_struct *gdt;
1da177e4
LT		 654
655 cpus = apm_save_cpus();
656
657 cpu = get_cpu();
251e6912
ZA		 658 gdt = get_cpu_gdt_table(cpu);
659 save_desc_40 = gdt[0x40 / 8];
660 gdt[0x40 / 8] = bad_bios_desc;
1da177e4 661
3864c489 662 apm_irq_save(flags);
1da177e4
LT		 663 APM_DO_SAVE_SEGS;
664 error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax);
665 APM_DO_RESTORE_SEGS;
3864c489 666 apm_irq_restore(flags);
251e6912 667 gdt[0x40 / 8] = save_desc_40;
1da177e4
LT		 668 put_cpu();
669 apm_restore_cpus(cpus);
670 return error;
671}
672
673/**
674 * apm_driver_version - APM driver version
675 * @val: loaded with the APM version on return
676 *
677 * Retrieve the APM version supported by the BIOS. This is only
678 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
679 * probably present.
680 *
681 * On entry val should point to a value indicating the APM driver
682 * version with the high byte being the major and the low byte the
683 * minor number both in BCD
684 *
685 * On return it will hold the BIOS revision supported in the
686 * same format.
687 */
688
689static int apm_driver_version(u_short *val)
690{
691 u32 eax;
692
693 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax))
694 return (eax >> 8) & 0xff;
695 *val = eax;
696 return APM_SUCCESS;
697}
698
699/**
700 * apm_get_event - get an APM event from the BIOS
701 * @event: pointer to the event
702 * @info: point to the event information
703 *
704 * The APM BIOS provides a polled information for event
705 * reporting. The BIOS expects to be polled at least every second
706 * when events are pending. When a message is found the caller should
707 * poll until no more messages are present. However, this causes
708 * problems on some laptops where a suspend event notification is
709 * not cleared until it is acknowledged.
710 *
711 * Additional information is returned in the info pointer, providing
712 * that APM 1.2 is in use. If no messges are pending the value 0x80
713 * is returned (No power management events pending).
714 */
715
716static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
717{
718 u32 eax;
719 u32 ebx;
720 u32 ecx;
721 u32 dummy;
722
723 if (apm_bios_call(APM_FUNC_GET_EVENT, 0, 0, &eax, &ebx, &ecx,
724 &dummy, &dummy))
725 return (eax >> 8) & 0xff;
726 *event = ebx;
727 if (apm_info.connection_version < 0x0102)
728 *info = ~0; /* indicate info not valid */
729 else
730 *info = ecx;
731 return APM_SUCCESS;
732}
733
734/**
735 * set_power_state - set the power management state
736 * @what: which items to transition
737 * @state: state to transition to
738 *
739 * Request an APM change of state for one or more system devices. The
740 * processor state must be transitioned last of all. what holds the
741 * class of device in the upper byte and the device number (0xFF for
742 * all) for the object to be transitioned.
743 *
744 * The state holds the state to transition to, which may in fact
745 * be an acceptance of a BIOS requested state change.
746 */
747
748static int set_power_state(u_short what, u_short state)
749{
750 u32 eax;
751
752 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax))
753 return (eax >> 8) & 0xff;
754 return APM_SUCCESS;
755}
756
757/**
758 * set_system_power_state - set system wide power state
759 * @state: which state to enter
760 *
761 * Transition the entire system into a new APM power state.
762 */
763
764static int set_system_power_state(u_short state)
765{
766 return set_power_state(APM_DEVICE_ALL, state);
767}
768
769/**
770 * apm_do_idle - perform power saving
771 *
772 * This function notifies the BIOS that the processor is (in the view
773 * of the OS) idle. It returns -1 in the event that the BIOS refuses
774 * to handle the idle request. On a success the function returns 1
775 * if the BIOS did clock slowing or 0 otherwise.
776 */
777
778static int apm_do_idle(void)
779{
780 u32 eax;
64c7c8f8
NP		 781 u8 ret = 0;
782 int idled = 0;
783 int polling;
784
495ab9c0 785 polling = !!(current_thread_info()->status & TS_POLLING);
64c7c8f8 786 if (polling) {
495ab9c0 787 current_thread_info()->status &= ~TS_POLLING;
0888f06a
IM		 788 /*
789 * TS_POLLING-cleared state must be visible before we
790 * test NEED_RESCHED:
791 */
792 smp_mb();
64c7c8f8
NP		 793 }
794 if (!need_resched()) {
795 idled = 1;
796 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax);
797 }
798 if (polling)
495ab9c0 799 current_thread_info()->status |= TS_POLLING;
64c7c8f8
NP		 800
801 if (!idled)
802 return 0;
803
804 if (ret) {
1da177e4
LT		 805 static unsigned long t;
806
807 /* This always fails on some SMP boards running UP kernels.
808 * Only report the failure the first 5 times.
809 */
810 if (++t < 5)
811 {
812 printk(KERN_DEBUG "apm_do_idle failed (%d)\n",
813 (eax >> 8) & 0xff);
814 t = jiffies;
815 }
816 return -1;
817 }
818 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
819 return clock_slowed;
820}
821
822/**
823 * apm_do_busy - inform the BIOS the CPU is busy
824 *
825 * Request that the BIOS brings the CPU back to full performance.
826 */
827
828static void apm_do_busy(void)
829{
830 u32 dummy;
831
832 if (clock_slowed || ALWAYS_CALL_BUSY) {
833 (void) apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy);
834 clock_slowed = 0;
835 }
836}
837
838/*
839 * If no process has really been interested in
840 * the CPU for some time, we want to call BIOS
841 * power management - we probably want
842 * to conserve power.
843 */
844#define IDLE_CALC_LIMIT (HZ * 100)
845#define IDLE_LEAKY_MAX 16
846
87af2ffd 847static void (*original_pm_idle)(void) __read_mostly;
1da177e4 848
1da177e4
LT		 849/**
850 * apm_cpu_idle - cpu idling for APM capable Linux
851 *
852 * This is the idling function the kernel executes when APM is available. It
853 * tries to do BIOS powermanagement based on the average system idle time.
854 * Furthermore it calls the system default idle routine.
855 */
856
857static void apm_cpu_idle(void)
858{
859 static int use_apm_idle; /* = 0 */
860 static unsigned int last_jiffies; /* = 0 */
861 static unsigned int last_stime; /* = 0 */
862
863 int apm_idle_done = 0;
864 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
865 unsigned int bucket;
866
867recalc:
868 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
869 use_apm_idle = 0;
870 last_jiffies = jiffies;
871 last_stime = current->stime;
872 } else if (jiffies_since_last_check > idle_period) {
873 unsigned int idle_percentage;
874
875 idle_percentage = current->stime - last_stime;
876 idle_percentage *= 100;
877 idle_percentage /= jiffies_since_last_check;
878 use_apm_idle = (idle_percentage > idle_threshold);
879 if (apm_info.forbid_idle)
880 use_apm_idle = 0;
881 last_jiffies = jiffies;
882 last_stime = current->stime;
883 }
884
885 bucket = IDLE_LEAKY_MAX;
886
887 while (!need_resched()) {
888 if (use_apm_idle) {
889 unsigned int t;
890
891 t = jiffies;
892 switch (apm_do_idle()) {
893 case 0: apm_idle_done = 1;
894 if (t != jiffies) {
895 if (bucket) {
896 bucket = IDLE_LEAKY_MAX;
897 continue;
898 }
899 } else if (bucket) {
900 bucket--;
901 continue;
902 }
903 break;
904 case 1: apm_idle_done = 1;
905 break;
906 default: /* BIOS refused */
907 break;
908 }
909 }
910 if (original_pm_idle)
911 original_pm_idle();
912 else
913 default_idle();
914 jiffies_since_last_check = jiffies - last_jiffies;
915 if (jiffies_since_last_check > idle_period)
916 goto recalc;
917 }
918
919 if (apm_idle_done)
920 apm_do_busy();
921}
922
923/**
924 * apm_power_off - ask the BIOS to power off
925 *
926 * Handle the power off sequence. This is the one piece of code we
927 * will execute even on SMP machines. In order to deal with BIOS
928 * bugs we support real mode APM BIOS power off calls. We also make
929 * the SMP call on CPU0 as some systems will only honour this call
930 * on their first cpu.
931 */
932
933static void apm_power_off(void)
934{
935 unsigned char po_bios_call[] = {
936 0xb8, 0x00, 0x10, /* movw $0x1000,ax */
937 0x8e, 0xd0, /* movw ax,ss */
938 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
939 0xb8, 0x07, 0x53, /* movw $0x5307,ax */
940 0xbb, 0x01, 0x00, /* movw $0x0001,bx */
941 0xb9, 0x03, 0x00, /* movw $0x0003,cx */
942 0xcd, 0x15 /* int $0x15 */
943 };
944
1da177e4 945 /* Some bioses don't like being called from CPU != 0 */
1da177e4
LT		 946 if (apm_info.realmode_power_off)
947 {
948 (void)apm_save_cpus();
949 machine_real_restart(po_bios_call, sizeof(po_bios_call));
950 }
951 else
952 (void) set_system_power_state(APM_STATE_OFF);
953}
954
955#ifdef CONFIG_APM_DO_ENABLE
956
957/**
958 * apm_enable_power_management - enable BIOS APM power management
959 * @enable: enable yes/no
960 *
961 * Enable or disable the APM BIOS power services.
962 */
963
964static int apm_enable_power_management(int enable)
965{
966 u32 eax;
967
968 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
969 return APM_NOT_ENGAGED;
970 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
971 enable, &eax))
972 return (eax >> 8) & 0xff;
973 if (enable)
974 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
975 else
976 apm_info.bios.flags |= APM_BIOS_DISABLED;
977 return APM_SUCCESS;
978}
979#endif
980
981/**
982 * apm_get_power_status - get current power state
983 * @status: returned status
984 * @bat: battery info
985 * @life: estimated life
986 *
987 * Obtain the current power status from the APM BIOS. We return a
988 * status which gives the rough battery status, and current power
989 * source. The bat value returned give an estimate as a percentage
990 * of life and a status value for the battery. The estimated life
991 * if reported is a lifetime in secodnds/minutes at current powwer
992 * consumption.
993 */
994
995static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
996{
997 u32 eax;
998 u32 ebx;
999 u32 ecx;
1000 u32 edx;
1001 u32 dummy;
1002
1003 if (apm_info.get_power_status_broken)
1004 return APM_32_UNSUPPORTED;
1005 if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0,
1006 &eax, &ebx, &ecx, &edx, &dummy))
1007 return (eax >> 8) & 0xff;
1008 *status = ebx;
1009 *bat = ecx;
1010 if (apm_info.get_power_status_swabinminutes) {
1011 *life = swab16((u16)edx);
1012 *life |= 0x8000;
1013 } else
1014 *life = edx;
1015 return APM_SUCCESS;
1016}
1017
1018#if 0
1019static int apm_get_battery_status(u_short which, u_short *status,
1020 u_short *bat, u_short *life, u_short *nbat)
1021{
1022 u32 eax;
1023 u32 ebx;
1024 u32 ecx;
1025 u32 edx;
1026 u32 esi;
1027
1028 if (apm_info.connection_version < 0x0102) {
1029 /* pretend we only have one battery. */
1030 if (which != 1)
1031 return APM_BAD_DEVICE;
1032 *nbat = 1;
1033 return apm_get_power_status(status, bat, life);
1034 }
1035
1036 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1037 &ebx, &ecx, &edx, &esi))
1038 return (eax >> 8) & 0xff;
1039 *status = ebx;
1040 *bat = ecx;
1041 *life = edx;
1042 *nbat = esi;
1043 return APM_SUCCESS;
1044}
1045#endif
1046
1047/**
1048 * apm_engage_power_management - enable PM on a device
1049 * @device: identity of device
1050 * @enable: on/off
1051 *
1052 * Activate or deactive power management on either a specific device
1053 * or the entire system (%APM_DEVICE_ALL).
1054 */
1055
1056static int apm_engage_power_management(u_short device, int enable)
1057{
1058 u32 eax;
1059
1060 if ((enable == 0) && (device == APM_DEVICE_ALL)
1061 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1062 return APM_DISABLED;
1063 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax))
1064 return (eax >> 8) & 0xff;
1065 if (device == APM_DEVICE_ALL) {
1066 if (enable)
1067 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1068 else
1069 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1070 }
1071 return APM_SUCCESS;
1072}
1073
1074#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1075
1076/**
1077 * apm_console_blank - blank the display
1078 * @blank: on/off
1079 *
1080 * Attempt to blank the console, firstly by blanking just video device
1081 * zero, and if that fails (some BIOSes don't support it) then it blanks
1082 * all video devices. Typically the BIOS will do laptop backlight and
1083 * monitor powerdown for us.
1084 */
1085
1086static int apm_console_blank(int blank)
1087{
87af2ffd
AM		 1088 int error = APM_NOT_ENGAGED; /* silence gcc */
1089 int i;
3841b0a1
JC		 1090 u_short state;
1091 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1da177e4
LT		 1092
1093 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
3841b0a1
JC		 1094
1095 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1096 error = set_power_state(dev[i], state);
1097
1098 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1099 return 1;
1100
1101 if (error == APM_NOT_ENGAGED)
1102 break;
1da177e4 1103 }
3841b0a1 1104
73374454 1105 if (error == APM_NOT_ENGAGED) {
1da177e4
LT		 1106 static int tried;
1107 int eng_error;
1108 if (tried++ == 0) {
1109 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1110 if (eng_error) {
1111 apm_error("set display", error);
1112 apm_error("engage interface", eng_error);
1113 return 0;
1114 } else
1115 return apm_console_blank(blank);
1116 }
1117 }
1118 apm_error("set display", error);
1119 return 0;
1120}
1121#endif
1122
1123static int queue_empty(struct apm_user *as)
1124{
1125 return as->event_head == as->event_tail;
1126}
1127
1128static apm_event_t get_queued_event(struct apm_user *as)
1129{
87af2ffd
AM		 1130 if (++as->event_tail >= APM_MAX_EVENTS)
1131 as->event_tail = 0;
1da177e4
LT		 1132 return as->events[as->event_tail];
1133}
1134
1135static void queue_event(apm_event_t event, struct apm_user *sender)
1136{
1137 struct apm_user * as;
1138
1139 spin_lock(&user_list_lock);
1140 if (user_list == NULL)
1141 goto out;
1142 for (as = user_list; as != NULL; as = as->next) {
1143 if ((as == sender) || (!as->reader))
1144 continue;
87af2ffd
AM		 1145 if (++as->event_head >= APM_MAX_EVENTS)
1146 as->event_head = 0;
1147
1da177e4
LT		 1148 if (as->event_head == as->event_tail) {
1149 static int notified;
1150
1151 if (notified++ == 0)
1152 printk(KERN_ERR "apm: an event queue overflowed\n");
87af2ffd
AM		 1153 if (++as->event_tail >= APM_MAX_EVENTS)
1154 as->event_tail = 0;
1da177e4
LT		 1155 }
1156 as->events[as->event_head] = event;
1157 if ((!as->suser) || (!as->writer))
1158 continue;
1159 switch (event) {
1160 case APM_SYS_SUSPEND:
1161 case APM_USER_SUSPEND:
1162 as->suspends_pending++;
1163 suspends_pending++;
1164 break;
1165
1166 case APM_SYS_STANDBY:
1167 case APM_USER_STANDBY:
1168 as->standbys_pending++;
1169 standbys_pending++;
1170 break;
1171 }
1172 }
1173 wake_up_interruptible(&apm_waitqueue);
1174out:
1175 spin_unlock(&user_list_lock);
1176}
1177
1178static void set_time(void)
1179{
c7f40ff1 1180 struct timespec ts;
1da177e4 1181 if (got_clock_diff) { /* Must know time zone in order to set clock */
c7f40ff1 1182 ts.tv_sec = get_cmos_time() + clock_cmos_diff;
1183 ts.tv_nsec = 0;
1184 do_settimeofday(&ts);
1da177e4
LT		 1185 }
1186}
1187
1188static void get_time_diff(void)
1189{
1190#ifndef CONFIG_APM_RTC_IS_GMT
1191 /*
1192 * Estimate time zone so that set_time can update the clock
1193 */
1194 clock_cmos_diff = -get_cmos_time();
1195 clock_cmos_diff += get_seconds();
1196 got_clock_diff = 1;
1197#endif
1198}
1199
1200static void reinit_timer(void)
1201{
1202#ifdef INIT_TIMER_AFTER_SUSPEND
306e440d 1203 unsigned long flags;
1da177e4
LT		 1204
1205 spin_lock_irqsave(&i8253_lock, flags);
1206 /* set the clock to 100 Hz */
1207 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1208 udelay(10);
1209 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1210 udelay(10);
1211 outb(LATCH >> 8, PIT_CH0); /* MSB */
1212 udelay(10);
1213 spin_unlock_irqrestore(&i8253_lock, flags);
1214#endif
1215}
1216
1217static int suspend(int vetoable)
1218{
1219 int err;
1220 struct apm_user *as;
1221
1222 if (pm_send_all(PM_SUSPEND, (void *)3)) {
1223 /* Vetoed */
1224 if (vetoable) {
1225 if (apm_info.connection_version > 0x100)
1226 set_system_power_state(APM_STATE_REJECT);
1227 err = -EBUSY;
1228 ignore_sys_suspend = 0;
1229 printk(KERN_WARNING "apm: suspend was vetoed.\n");
1230 goto out;
1231 }
1232 printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
1233 }
1234
1235 device_suspend(PMSG_SUSPEND);
1236 local_irq_disable();
1237 device_power_down(PMSG_SUSPEND);
1238
1239 /* serialize with the timer interrupt */
1240 write_seqlock(&xtime_lock);
1241
1242 /* protect against access to timer chip registers */
1243 spin_lock(&i8253_lock);
1244
1245 get_time_diff();
1246 /*
1247 * Irq spinlock must be dropped around set_system_power_state.
1248 * We'll undo any timer changes due to interrupts below.
1249 */
1250 spin_unlock(&i8253_lock);
1251 write_sequnlock(&xtime_lock);
1252 local_irq_enable();
1253
1254 save_processor_state();
1255 err = set_system_power_state(APM_STATE_SUSPEND);
92c6dc59 1256 ignore_normal_resume = 1;
1da177e4
LT		 1257 restore_processor_state();
1258
1259 local_irq_disable();
1da177e4 1260 set_time();
c7f40ff1 1261 reinit_timer();
1da177e4
LT		 1262
1263 if (err == APM_NO_ERROR)
1264 err = APM_SUCCESS;
1265 if (err != APM_SUCCESS)
1266 apm_error("suspend", err);
1267 err = (err == APM_SUCCESS) ? 0 : -EIO;
1268 device_power_up();
1269 local_irq_enable();
1270 device_resume();
1271 pm_send_all(PM_RESUME, (void *)0);
1272 queue_event(APM_NORMAL_RESUME, NULL);
1273 out:
1274 spin_lock(&user_list_lock);
1275 for (as = user_list; as != NULL; as = as->next) {
1276 as->suspend_wait = 0;
1277 as->suspend_result = err;
1278 }
1279 spin_unlock(&user_list_lock);
1280 wake_up_interruptible(&apm_suspend_waitqueue);
1281 return err;
1282}
1283
1284static void standby(void)
1285{
1286 int err;
1287
1288 local_irq_disable();
1289 device_power_down(PMSG_SUSPEND);
1290 /* serialize with the timer interrupt */
1291 write_seqlock(&xtime_lock);
1292 /* If needed, notify drivers here */
1293 get_time_diff();
1294 write_sequnlock(&xtime_lock);
1295 local_irq_enable();
1296
1297 err = set_system_power_state(APM_STATE_STANDBY);
1298 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1299 apm_error("standby", err);
1300
1301 local_irq_disable();
1302 device_power_up();
1303 local_irq_enable();
1304}
1305
1306static apm_event_t get_event(void)
1307{
1308 int error;
87af2ffd 1309 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1da177e4
LT		 1310 apm_eventinfo_t info;
1311
1312 static int notified;
1313
1314 /* we don't use the eventinfo */
1315 error = apm_get_event(&event, &info);
1316 if (error == APM_SUCCESS)
1317 return event;
1318
1319 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1320 apm_error("get_event", error);
1321
1322 return 0;
1323}
1324
1325static void check_events(void)
1326{
1327 apm_event_t event;
1328 static unsigned long last_resume;
1329 static int ignore_bounce;
1330
1331 while ((event = get_event()) != 0) {
1332 if (debug) {
1333 if (event <= NR_APM_EVENT_NAME)
1334 printk(KERN_DEBUG "apm: received %s notify\n",
1335 apm_event_name[event - 1]);
1336 else
1337 printk(KERN_DEBUG "apm: received unknown "
1338 "event 0x%02x\n", event);
1339 }
1340 if (ignore_bounce
1341 && ((jiffies - last_resume) > bounce_interval))
1342 ignore_bounce = 0;
1343
1344 switch (event) {
1345 case APM_SYS_STANDBY:
1346 case APM_USER_STANDBY:
1347 queue_event(event, NULL);
1348 if (standbys_pending <= 0)
1349 standby();
1350 break;
1351
1352 case APM_USER_SUSPEND:
1353#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1354 if (apm_info.connection_version > 0x100)
1355 set_system_power_state(APM_STATE_REJECT);
1356 break;
1357#endif
1358 case APM_SYS_SUSPEND:
1359 if (ignore_bounce) {
1360 if (apm_info.connection_version > 0x100)
1361 set_system_power_state(APM_STATE_REJECT);
1362 break;
1363 }
1364 /*
1365 * If we are already processing a SUSPEND,
1366 * then further SUSPEND events from the BIOS
1367 * will be ignored. We also return here to
1368 * cope with the fact that the Thinkpads keep
1369 * sending a SUSPEND event until something else
1370 * happens!
1371 */
1372 if (ignore_sys_suspend)
1373 return;
1374 ignore_sys_suspend = 1;
1375 queue_event(event, NULL);
1376 if (suspends_pending <= 0)
1377 (void) suspend(1);
1378 break;
1379
1380 case APM_NORMAL_RESUME:
1381 case APM_CRITICAL_RESUME:
1382 case APM_STANDBY_RESUME:
1383 ignore_sys_suspend = 0;
1384 last_resume = jiffies;
1385 ignore_bounce = 1;
1386 if ((event != APM_NORMAL_RESUME)
1387 || (ignore_normal_resume == 0)) {
1da177e4 1388 set_time();
1da177e4
LT		 1389 device_resume();
1390 pm_send_all(PM_RESUME, (void *)0);
1391 queue_event(event, NULL);
1392 }
1393 ignore_normal_resume = 0;
1394 break;
1395
1396 case APM_CAPABILITY_CHANGE:
1397 case APM_LOW_BATTERY:
1398 case APM_POWER_STATUS_CHANGE:
1399 queue_event(event, NULL);
1400 /* If needed, notify drivers here */
1401 break;
1402
1403 case APM_UPDATE_TIME:
1da177e4 1404 set_time();
1da177e4
LT		 1405 break;
1406
1407 case APM_CRITICAL_SUSPEND:
1408 /*
1409 * We are not allowed to reject a critical suspend.
1410 */
1411 (void) suspend(0);
1412 break;
1413 }
1414 }
1415}
1416
1417static void apm_event_handler(void)
1418{
1419 static int pending_count = 4;
1420 int err;
1421
1422 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1423 if ((apm_info.connection_version > 0x100) &&
1424 (pending_count-- <= 0)) {
1425 pending_count = 4;
1426 if (debug)
1427 printk(KERN_DEBUG "apm: setting state busy\n");
1428 err = set_system_power_state(APM_STATE_BUSY);
1429 if (err)
1430 apm_error("busy", err);
1431 }
1432 } else
1433 pending_count = 4;
1434 check_events();
1435}
1436
1437/*
1438 * This is the APM thread main loop.
1439 */
1440
1441static void apm_mainloop(void)
1442{
1443 DECLARE_WAITQUEUE(wait, current);
1444
1445 add_wait_queue(&apm_waitqueue, &wait);
1446 set_current_state(TASK_INTERRUPTIBLE);
1447 for (;;) {
1448 schedule_timeout(APM_CHECK_TIMEOUT);
fc09561d 1449 if (kthread_should_stop())
1da177e4
LT		 1450 break;
1451 /*
1452 * Ok, check all events, check for idle (and mark us sleeping
1453 * so as not to count towards the load average)..
1454 */
1455 set_current_state(TASK_INTERRUPTIBLE);
1456 apm_event_handler();
1457 }
1458 remove_wait_queue(&apm_waitqueue, &wait);
1459}
1460
1461static int check_apm_user(struct apm_user *as, const char *func)
1462{
1463 if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) {
1464 printk(KERN_ERR "apm: %s passed bad filp\n", func);
1465 return 1;
1466 }
1467 return 0;
1468}
1469
1470static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1471{
1472 struct apm_user * as;
1473 int i;
1474 apm_event_t event;
1475
1476 as = fp->private_data;
1477 if (check_apm_user(as, "read"))
1478 return -EIO;
1479 if ((int)count < sizeof(apm_event_t))
1480 return -EINVAL;
1481 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1482 return -EAGAIN;
1483 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1484 i = count;
1485 while ((i >= sizeof(event)) && !queue_empty(as)) {
1486 event = get_queued_event(as);
1487 if (copy_to_user(buf, &event, sizeof(event))) {
1488 if (i < count)
1489 break;
1490 return -EFAULT;
1491 }
1492 switch (event) {
1493 case APM_SYS_SUSPEND:
1494 case APM_USER_SUSPEND:
1495 as->suspends_read++;
1496 break;
1497
1498 case APM_SYS_STANDBY:
1499 case APM_USER_STANDBY:
1500 as->standbys_read++;
1501 break;
1502 }
1503 buf += sizeof(event);
1504 i -= sizeof(event);
1505 }
1506 if (i < count)
1507 return count - i;
1508 if (signal_pending(current))
1509 return -ERESTARTSYS;
1510 return 0;
1511}
1512
1513static unsigned int do_poll(struct file *fp, poll_table * wait)
1514{
1515 struct apm_user * as;
1516
1517 as = fp->private_data;
1518 if (check_apm_user(as, "poll"))
1519 return 0;
1520 poll_wait(fp, &apm_waitqueue, wait);
1521 if (!queue_empty(as))
1522 return POLLIN | POLLRDNORM;
1523 return 0;
1524}
1525
1526static int do_ioctl(struct inode * inode, struct file *filp,
1527 u_int cmd, u_long arg)
1528{
1529 struct apm_user * as;
1530
1531 as = filp->private_data;
1532 if (check_apm_user(as, "ioctl"))
1533 return -EIO;
1534 if ((!as->suser) || (!as->writer))
1535 return -EPERM;
1536 switch (cmd) {
1537 case APM_IOC_STANDBY:
1538 if (as->standbys_read > 0) {
1539 as->standbys_read--;
1540 as->standbys_pending--;
1541 standbys_pending--;
1542 } else
1543 queue_event(APM_USER_STANDBY, as);
1544 if (standbys_pending <= 0)
1545 standby();
1546 break;
1547 case APM_IOC_SUSPEND:
1548 if (as->suspends_read > 0) {
1549 as->suspends_read--;
1550 as->suspends_pending--;
1551 suspends_pending--;
1552 } else
1553 queue_event(APM_USER_SUSPEND, as);
1554 if (suspends_pending <= 0) {
1555 return suspend(1);
1556 } else {
1557 as->suspend_wait = 1;
1558 wait_event_interruptible(apm_suspend_waitqueue,
1559 as->suspend_wait == 0);
1560 return as->suspend_result;
1561 }
1562 break;
1563 default:
1564 return -EINVAL;
1565 }
1566 return 0;
1567}
1568
1569static int do_release(struct inode * inode, struct file * filp)
1570{
1571 struct apm_user * as;
1572
1573 as = filp->private_data;
1574 if (check_apm_user(as, "release"))
1575 return 0;
1576 filp->private_data = NULL;
1577 if (as->standbys_pending > 0) {
1578 standbys_pending -= as->standbys_pending;
1579 if (standbys_pending <= 0)
1580 standby();
1581 }
1582 if (as->suspends_pending > 0) {
1583 suspends_pending -= as->suspends_pending;
1584 if (suspends_pending <= 0)
1585 (void) suspend(1);
1586 }
1587 spin_lock(&user_list_lock);
1588 if (user_list == as)
1589 user_list = as->next;
1590 else {
1591 struct apm_user * as1;
1592
1593 for (as1 = user_list;
1594 (as1 != NULL) && (as1->next != as);
1595 as1 = as1->next)
1596 ;
1597 if (as1 == NULL)
1598 printk(KERN_ERR "apm: filp not in user list\n");
1599 else
1600 as1->next = as->next;
1601 }
1602 spin_unlock(&user_list_lock);
1603 kfree(as);
1604 return 0;
1605}
1606
1607static int do_open(struct inode * inode, struct file * filp)
1608{
1609 struct apm_user * as;
1610
5cbded58 1611 as = kmalloc(sizeof(*as), GFP_KERNEL);
1da177e4
LT		 1612 if (as == NULL) {
1613 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1614 sizeof(*as));
1615 return -ENOMEM;
1616 }
1617 as->magic = APM_BIOS_MAGIC;
1618 as->event_tail = as->event_head = 0;
1619 as->suspends_pending = as->standbys_pending = 0;
1620 as->suspends_read = as->standbys_read = 0;
1621 /*
1622 * XXX - this is a tiny bit broken, when we consider BSD
1623 * process accounting. If the device is opened by root, we
1624 * instantly flag that we used superuser privs. Who knows,
1625 * we might close the device immediately without doing a
1626 * privileged operation -- cevans
1627 */
1628 as->suser = capable(CAP_SYS_ADMIN);
1629 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1630 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1631 spin_lock(&user_list_lock);
1632 as->next = user_list;
1633 user_list = as;
1634 spin_unlock(&user_list_lock);
1635 filp->private_data = as;
1636 return 0;
1637}
1638
1639static int apm_get_info(char *buf, char **start, off_t fpos, int length)
1640{
1641 char * p;
1642 unsigned short bx;
1643 unsigned short cx;
1644 unsigned short dx;
1645 int error;
1646 unsigned short ac_line_status = 0xff;
1647 unsigned short battery_status = 0xff;
1648 unsigned short battery_flag = 0xff;
1649 int percentage = -1;
1650 int time_units = -1;
1651 char *units = "?";
1652
1653 p = buf;
1654
1655 if ((num_online_cpus() == 1) &&
1656 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1657 ac_line_status = (bx >> 8) & 0xff;
1658 battery_status = bx & 0xff;
1659 if ((cx & 0xff) != 0xff)
1660 percentage = cx & 0xff;
1661
1662 if (apm_info.connection_version > 0x100) {
1663 battery_flag = (cx >> 8) & 0xff;
1664 if (dx != 0xffff) {
1665 units = (dx & 0x8000) ? "min" : "sec";
1666 time_units = dx & 0x7fff;
1667 }
1668 }
1669 }
1670 /* Arguments, with symbols from linux/apm_bios.h. Information is
1671 from the Get Power Status (0x0a) call unless otherwise noted.
1672
1673 0) Linux driver version (this will change if format changes)
1674 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1675 2) APM flags from APM Installation Check (0x00):
1676 bit 0: APM_16_BIT_SUPPORT
1677 bit 1: APM_32_BIT_SUPPORT
1678 bit 2: APM_IDLE_SLOWS_CLOCK
1679 bit 3: APM_BIOS_DISABLED
1680 bit 4: APM_BIOS_DISENGAGED
1681 3) AC line status
1682 0x00: Off-line
1683 0x01: On-line
1684 0x02: On backup power (BIOS >= 1.1 only)
1685 0xff: Unknown
1686 4) Battery status
1687 0x00: High
1688 0x01: Low
1689 0x02: Critical
1690 0x03: Charging
1691 0x04: Selected battery not present (BIOS >= 1.2 only)
1692 0xff: Unknown
1693 5) Battery flag
1694 bit 0: High
1695 bit 1: Low
1696 bit 2: Critical
1697 bit 3: Charging
1698 bit 7: No system battery
1699 0xff: Unknown
1700 6) Remaining battery life (percentage of charge):
1701 0-100: valid
1702 -1: Unknown
1703 7) Remaining battery life (time units):
1704 Number of remaining minutes or seconds
1705 -1: Unknown
1706 8) min = minutes; sec = seconds */
1707
1708 p += sprintf(p, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1709 driver_version,
1710 (apm_info.bios.version >> 8) & 0xff,
1711 apm_info.bios.version & 0xff,
1712 apm_info.bios.flags,
1713 ac_line_status,
1714 battery_status,
1715 battery_flag,
1716 percentage,
1717 time_units,
1718 units);
1719
1720 return p - buf;
1721}
1722
1723static int apm(void *unused)
1724{
1725 unsigned short bx;
1726 unsigned short cx;
1727 unsigned short dx;
1728 int error;
1729 char * power_stat;
1730 char * bat_stat;
1731
1da177e4
LT		 1732#ifdef CONFIG_SMP
1733 /* 2002/08/01 - WT
1734 * This is to avoid random crashes at boot time during initialization
1735 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1736 * Some bioses don't like being called from CPU != 0.
1737 * Method suggested by Ingo Molnar.
1738 */
1739 set_cpus_allowed(current, cpumask_of_cpu(0));
1740 BUG_ON(smp_processor_id() != 0);
1741#endif
1742
1743 if (apm_info.connection_version == 0) {
1744 apm_info.connection_version = apm_info.bios.version;
1745 if (apm_info.connection_version > 0x100) {
1746 /*
1747 * We only support BIOSs up to version 1.2
1748 */
1749 if (apm_info.connection_version > 0x0102)
1750 apm_info.connection_version = 0x0102;
1751 error = apm_driver_version(&apm_info.connection_version);
1752 if (error != APM_SUCCESS) {
1753 apm_error("driver version", error);
1754 /* Fall back to an APM 1.0 connection. */
1755 apm_info.connection_version = 0x100;
1756 }
1757 }
1758 }
1759
1760 if (debug)
1761 printk(KERN_INFO "apm: Connection version %d.%d\n",
1762 (apm_info.connection_version >> 8) & 0xff,
1763 apm_info.connection_version & 0xff);
1764
1765#ifdef CONFIG_APM_DO_ENABLE
1766 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1767 /*
1768 * This call causes my NEC UltraLite Versa 33/C to hang if it
1769 * is booted with PM disabled but not in the docking station.
1770 * Unfortunate ...
1771 */
1772 error = apm_enable_power_management(1);
1773 if (error) {
1774 apm_error("enable power management", error);
1775 return -1;
1776 }
1777 }
1778#endif
1779
1780 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1781 && (apm_info.connection_version > 0x0100)) {
1782 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1783 if (error) {
1784 apm_error("engage power management", error);
1785 return -1;
1786 }
1787 }
1788
1789 if (debug && (num_online_cpus() == 1 || smp )) {
1790 error = apm_get_power_status(&bx, &cx, &dx);
1791 if (error)
1792 printk(KERN_INFO "apm: power status not available\n");
1793 else {
1794 switch ((bx >> 8) & 0xff) {
1795 case 0: power_stat = "off line"; break;
1796 case 1: power_stat = "on line"; break;
1797 case 2: power_stat = "on backup power"; break;
1798 default: power_stat = "unknown"; break;
1799 }
1800 switch (bx & 0xff) {
1801 case 0: bat_stat = "high"; break;
1802 case 1: bat_stat = "low"; break;
1803 case 2: bat_stat = "critical"; break;
1804 case 3: bat_stat = "charging"; break;
1805 default: bat_stat = "unknown"; break;
1806 }
1807 printk(KERN_INFO
1808 "apm: AC %s, battery status %s, battery life ",
1809 power_stat, bat_stat);
1810 if ((cx & 0xff) == 0xff)
1811 printk("unknown\n");
1812 else
1813 printk("%d%%\n", cx & 0xff);
1814 if (apm_info.connection_version > 0x100) {
1815 printk(KERN_INFO
1816 "apm: battery flag 0x%02x, battery life ",
1817 (cx >> 8) & 0xff);
1818 if (dx == 0xffff)
1819 printk("unknown\n");
1820 else
1821 printk("%d %s\n", dx & 0x7fff,
1822 (dx & 0x8000) ?
1823 "minutes" : "seconds");
1824 }
1825 }
1826 }
1827
1828 /* Install our power off handler.. */
1829 if (power_off)
1830 pm_power_off = apm_power_off;
1831
1832 if (num_online_cpus() == 1 || smp) {
1833#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1834 console_blank_hook = apm_console_blank;
1835#endif
1836 apm_mainloop();
1837#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1838 console_blank_hook = NULL;
1839#endif
1840 }
1da177e4
LT		 1841
1842 return 0;
1843}
1844
1845#ifndef MODULE
1846static int __init apm_setup(char *str)
1847{
1848 int invert;
1849
1850 while ((str != NULL) && (*str != '\0')) {
1851 if (strncmp(str, "off", 3) == 0)
1852 apm_disabled = 1;
1853 if (strncmp(str, "on", 2) == 0)
1854 apm_disabled = 0;
1855 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1856 (strncmp(str, "bounce_interval=", 16) == 0))
1857 bounce_interval = simple_strtol(str + 16, NULL, 0);
1858 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1859 (strncmp(str, "idle_threshold=", 15) == 0))
1860 idle_threshold = simple_strtol(str + 15, NULL, 0);
1861 if ((strncmp(str, "idle-period=", 12) == 0) ||
1862 (strncmp(str, "idle_period=", 12) == 0))
1863 idle_period = simple_strtol(str + 12, NULL, 0);
1864 invert = (strncmp(str, "no-", 3) == 0) ||
1865 (strncmp(str, "no_", 3) == 0);
1866 if (invert)
1867 str += 3;
1868 if (strncmp(str, "debug", 5) == 0)
1869 debug = !invert;
1870 if ((strncmp(str, "power-off", 9) == 0) ||
1871 (strncmp(str, "power_off", 9) == 0))
1872 power_off = !invert;
1873 if (strncmp(str, "smp", 3) == 0)
1874 {
1875 smp = !invert;
1876 idle_threshold = 100;
1877 }
1878 if ((strncmp(str, "allow-ints", 10) == 0) ||
1879 (strncmp(str, "allow_ints", 10) == 0))
1880 apm_info.allow_ints = !invert;
1881 if ((strncmp(str, "broken-psr", 10) == 0) ||
1882 (strncmp(str, "broken_psr", 10) == 0))
1883 apm_info.get_power_status_broken = !invert;
1884 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1885 (strncmp(str, "realmode_power_off", 18) == 0))
1886 apm_info.realmode_power_off = !invert;
1887 str = strchr(str, ',');
1888 if (str != NULL)
1889 str += strspn(str, ", \t");
1890 }
1891 return 1;
1892}
1893
1894__setup("apm=", apm_setup);
1895#endif
1896
1897static struct file_operations apm_bios_fops = {
1898 .owner = THIS_MODULE,
1899 .read = do_read,
1900 .poll = do_poll,
1901 .ioctl = do_ioctl,
1902 .open = do_open,
1903 .release = do_release,
1904};
1905
1906static struct miscdevice apm_device = {
1907 APM_MINOR_DEV,
1908 "apm_bios",
1909 &apm_bios_fops
1910};
1911
1912
1913/* Simple "print if true" callback */
1914static int __init print_if_true(struct dmi_system_id *d)
1915{
1916 printk("%s\n", d->ident);
1917 return 0;
1918}
1919
1920/*
1921 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1922 * disabled before the suspend. Linux used to get terribly confused by that.
1923 */
1924static int __init broken_ps2_resume(struct dmi_system_id *d)
1925{
1926 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug workaround hopefully not needed.\n", d->ident);
1927 return 0;
1928}
1929
1930/* Some bioses have a broken protected mode poweroff and need to use realmode */
1931static int __init set_realmode_power_off(struct dmi_system_id *d)
1932{
1933 if (apm_info.realmode_power_off == 0) {
1934 apm_info.realmode_power_off = 1;
1935 printk(KERN_INFO "%s bios detected. Using realmode poweroff only.\n", d->ident);
1936 }
1937 return 0;
1938}
1939
1940/* Some laptops require interrupts to be enabled during APM calls */
1941static int __init set_apm_ints(struct dmi_system_id *d)
1942{
1943 if (apm_info.allow_ints == 0) {
1944 apm_info.allow_ints = 1;
1945 printk(KERN_INFO "%s machine detected. Enabling interrupts during APM calls.\n", d->ident);
1946 }
1947 return 0;
1948}
1949
1950/* Some APM bioses corrupt memory or just plain do not work */
1951static int __init apm_is_horked(struct dmi_system_id *d)
1952{
1953 if (apm_info.disabled == 0) {
1954 apm_info.disabled = 1;
1955 printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
1956 }
1957 return 0;
1958}
1959
1960static int __init apm_is_horked_d850md(struct dmi_system_id *d)
1961{
1962 if (apm_info.disabled == 0) {
1963 apm_info.disabled = 1;
1964 printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
1965 printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n");
1966 printk(KERN_INFO "download from support.intel.com \n");
1967 }
1968 return 0;
1969}
1970
1971/* Some APM bioses hang on APM idle calls */
1972static int __init apm_likes_to_melt(struct dmi_system_id *d)
1973{
1974 if (apm_info.forbid_idle == 0) {
1975 apm_info.forbid_idle = 1;
1976 printk(KERN_INFO "%s machine detected. Disabling APM idle calls.\n", d->ident);
1977 }
1978 return 0;
1979}
1980
1981/*
1982 * Check for clue free BIOS implementations who use
1983 * the following QA technique
1984 *
1985 * [ Write BIOS Code ]<------
1986 * | ^
1987 * < Does it Compile >----N--
1988 * |Y ^
1989 * < Does it Boot Win98 >-N--
1990 * |Y
1991 * [Ship It]
1992 *
1993 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
1994 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
1995 */
1996static int __init broken_apm_power(struct dmi_system_id *d)
1997{
1998 apm_info.get_power_status_broken = 1;
1999 printk(KERN_WARNING "BIOS strings suggest APM bugs, disabling power status reporting.\n");
2000 return 0;
2001}
2002
2003/*
2004 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2005 * have this problem).
2006 */
2007static int __init swab_apm_power_in_minutes(struct dmi_system_id *d)
2008{
2009 apm_info.get_power_status_swabinminutes = 1;
2010 printk(KERN_WARNING "BIOS strings suggest APM reports battery life in minutes and wrong byte order.\n");
2011 return 0;
2012}
2013
2014static struct dmi_system_id __initdata apm_dmi_table[] = {
2015 {
2016 print_if_true,
2017 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2018 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2019 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2020 },
2021 { /* Handle problems with APM on the C600 */
2022 broken_ps2_resume, "Dell Latitude C600",
2023 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2024 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2025 },
2026 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2027 set_apm_ints, "Dell Latitude",
2028 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2029 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2030 },
2031 { /* APM crashes */
2032 apm_is_horked, "Dell Inspiron 2500",
2033 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2034 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2035 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
2036 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2037 },
2038 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2039 set_apm_ints, "Dell Inspiron", {
2040 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2041 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2042 },
2043 { /* Handle problems with APM on Inspiron 5000e */
2044 broken_apm_power, "Dell Inspiron 5000e",
2045 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2046 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2047 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2048 },
2049 { /* Handle problems with APM on Inspiron 2500 */
2050 broken_apm_power, "Dell Inspiron 2500",
2051 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2052 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2053 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2054 },
2055 { /* APM crashes */
2056 apm_is_horked, "Dell Dimension 4100",
2057 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2058 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2059 DMI_MATCH(DMI_BIOS_VENDOR,"Intel Corp."),
2060 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2061 },
2062 { /* Allow interrupts during suspend on Compaq Laptops*/
2063 set_apm_ints, "Compaq 12XL125",
2064 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2065 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2066 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2067 DMI_MATCH(DMI_BIOS_VERSION,"4.06"), },
2068 },
2069 { /* Allow interrupts during APM or the clock goes slow */
2070 set_apm_ints, "ASUSTeK",
2071 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2072 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2073 },
2074 { /* APM blows on shutdown */
2075 apm_is_horked, "ABIT KX7-333[R]",
2076 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2077 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2078 },
2079 { /* APM crashes */
2080 apm_is_horked, "Trigem Delhi3",
2081 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2082 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2083 },
2084 { /* APM crashes */
2085 apm_is_horked, "Fujitsu-Siemens",
2086 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2087 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2088 },
2089 { /* APM crashes */
2090 apm_is_horked_d850md, "Intel D850MD",
2091 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2092 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2093 },
2094 { /* APM crashes */
2095 apm_is_horked, "Intel D810EMO",
2096 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2097 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2098 },
2099 { /* APM crashes */
2100 apm_is_horked, "Dell XPS-Z",
2101 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2102 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2103 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2104 },
2105 { /* APM crashes */
2106 apm_is_horked, "Sharp PC-PJ/AX",
2107 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2108 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2109 DMI_MATCH(DMI_BIOS_VENDOR,"SystemSoft"),
2110 DMI_MATCH(DMI_BIOS_VERSION,"Version R2.08"), },
2111 },
2112 { /* APM crashes */
2113 apm_is_horked, "Dell Inspiron 2500",
2114 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2115 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2116 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
2117 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2118 },
2119 { /* APM idle hangs */
2120 apm_likes_to_melt, "Jabil AMD",
2121 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2122 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2123 },
2124 { /* APM idle hangs */
2125 apm_likes_to_melt, "AMI Bios",
2126 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2127 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2128 },
2129 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2130 swab_apm_power_in_minutes, "Sony VAIO",
2131 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2132 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2133 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2134 },
2135 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2136 swab_apm_power_in_minutes, "Sony VAIO",
2137 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2138 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2139 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2140 },
2141 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2142 swab_apm_power_in_minutes, "Sony VAIO",
2143 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2144 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2145 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2146 },
2147 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2148 swab_apm_power_in_minutes, "Sony VAIO",
2149 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2150 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2151 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2152 },
2153 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2154 swab_apm_power_in_minutes, "Sony VAIO",
2155 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2156 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2157 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2158 },
2159 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2160 swab_apm_power_in_minutes, "Sony VAIO",
2161 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2162 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2163 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2164 },
2165 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2166 swab_apm_power_in_minutes, "Sony VAIO",
2167 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2168 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2169 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2170 },
2171 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2172 swab_apm_power_in_minutes, "Sony VAIO",
2173 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2174 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2175 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2176 },
2177 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2178 swab_apm_power_in_minutes, "Sony VAIO",
2179 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2180 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2181 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2182 },
2183 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2184 swab_apm_power_in_minutes, "Sony VAIO",
2185 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2186 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2187 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2188 },
2189
2190 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2191 swab_apm_power_in_minutes, "Sony VAIO",
2192 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2193 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2194 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2195 },
2196 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2197 swab_apm_power_in_minutes, "Sony VAIO",
2198 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2199 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2200 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2201 },
2202 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2203 swab_apm_power_in_minutes, "Sony VAIO",
2204 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2205 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2206 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2207 },
2208 { /* broken PM poweroff bios */
2209 set_realmode_power_off, "Award Software v4.60 PGMA",
2210 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2211 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2212 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2213 },
2214
2215 /* Generic per vendor APM settings */
2216
2217 { /* Allow interrupts during suspend on IBM laptops */
2218 set_apm_ints, "IBM",
2219 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2220 },
2221
2222 { }
2223};
2224
2225/*
2226 * Just start the APM thread. We do NOT want to do APM BIOS
2227 * calls from anything but the APM thread, if for no other reason
2228 * than the fact that we don't trust the APM BIOS. This way,
2229 * most common APM BIOS problems that lead to protection errors
2230 * etc will have at least some level of being contained...
2231 *
2232 * In short, if something bad happens, at least we have a choice
2233 * of just killing the apm thread..
2234 */
2235static int __init apm_init(void)
2236{
2237 struct proc_dir_entry *apm_proc;
92f17f01 2238 struct desc_struct *gdt;
fc09561d 2239 int err;
1da177e4
LT		 2240
2241 dmi_check_system(apm_dmi_table);
2242
6020c8f3 2243 if (apm_info.bios.version == 0 || paravirt_enabled()) {
1da177e4
LT		 2244 printk(KERN_INFO "apm: BIOS not found.\n");
2245 return -ENODEV;
2246 }
2247 printk(KERN_INFO
2248 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2249 ((apm_info.bios.version >> 8) & 0xff),
2250 (apm_info.bios.version & 0xff),
2251 apm_info.bios.flags,
2252 driver_version);
2253 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2254 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2255 return -ENODEV;
2256 }
2257
2258 if (allow_ints)
2259 apm_info.allow_ints = 1;
2260 if (broken_psr)
2261 apm_info.get_power_status_broken = 1;
2262 if (realmode_power_off)
2263 apm_info.realmode_power_off = 1;
2264 /* User can override, but default is to trust DMI */
2265 if (apm_disabled != -1)
2266 apm_info.disabled = apm_disabled;
2267
2268 /*
2269 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2270 * but is reportedly a 1.0 BIOS.
2271 */
2272 if (apm_info.bios.version == 0x001)
2273 apm_info.bios.version = 0x100;
2274
2275 /* BIOS < 1.2 doesn't set cseg_16_len */
2276 if (apm_info.bios.version < 0x102)
2277 apm_info.bios.cseg_16_len = 0; /* 64k */
2278
2279 if (debug) {
2280 printk(KERN_INFO "apm: entry %x:%lx cseg16 %x dseg %x",
2281 apm_info.bios.cseg, apm_info.bios.offset,
2282 apm_info.bios.cseg_16, apm_info.bios.dseg);
2283 if (apm_info.bios.version > 0x100)
2284 printk(" cseg len %x, dseg len %x",
2285 apm_info.bios.cseg_len,
2286 apm_info.bios.dseg_len);
2287 if (apm_info.bios.version > 0x101)
2288 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2289 printk("\n");
2290 }
2291
2292 if (apm_info.disabled) {
2293 printk(KERN_NOTICE "apm: disabled on user request.\n");
2294 return -ENODEV;
2295 }
2296 if ((num_online_cpus() > 1) && !power_off && !smp) {
2297 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2298 apm_info.disabled = 1;
2299 return -ENODEV;
2300 }
2301 if (PM_IS_ACTIVE()) {
2302 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2303 apm_info.disabled = 1;
2304 return -ENODEV;
2305 }
987d4613 2306#ifdef CONFIG_PM_LEGACY
1da177e4 2307 pm_active = 1;
987d4613 2308#endif
1da177e4
LT		 2309
2310 /*
2311 * Set up a segment that references the real mode segment 0x40
2312 * that extends up to the end of page zero (that we have reserved).
2313 * This is for buggy BIOS's that refer to (real mode) segment 0x40
2314 * even though they are called in protected mode.
2315 */
2316 set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
2317 _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
2318
3012d2d2
ZA		 2319 /*
2320 * Set up the long jump entry point to the APM BIOS, which is called
2321 * from inline assembly.
2322 */
1da177e4
LT		 2323 apm_bios_entry.offset = apm_info.bios.offset;
2324 apm_bios_entry.segment = APM_CS;
2325
3012d2d2
ZA		 2326 /*
2327 * The APM 1.1 BIOS is supposed to provide limit information that it
2328 * recognizes. Many machines do this correctly, but many others do
2329 * not restrict themselves to their claimed limit. When this happens,
2330 * they will cause a segmentation violation in the kernel at boot time.
2331 * Most BIOS's, however, will respect a 64k limit, so we use that.
92f17f01
ZA		 2332 *
2333 * Note we only set APM segments on CPU zero, since we pin the APM
2334 * code to that CPU.
3012d2d2 2335 */
92f17f01
ZA		 2336 gdt = get_cpu_gdt_table(0);
2337 set_base(gdt[APM_CS >> 3],
2338 __va((unsigned long)apm_info.bios.cseg << 4));
2339 set_base(gdt[APM_CS_16 >> 3],
2340 __va((unsigned long)apm_info.bios.cseg_16 << 4));
2341 set_base(gdt[APM_DS >> 3],
2342 __va((unsigned long)apm_info.bios.dseg << 4));
1da177e4
LT		 2343
2344 apm_proc = create_proc_info_entry("apm", 0, NULL, apm_get_info);
2345 if (apm_proc)
2346 apm_proc->owner = THIS_MODULE;
2347
fc09561d
SH		 2348 kapmd_task = kthread_create(apm, NULL, "kapmd");
2349 if (IS_ERR(kapmd_task)) {
2350 printk(KERN_ERR "apm: disabled - Unable to start kernel "
2351 "thread.\n");
2352 err = PTR_ERR(kapmd_task);
2353 kapmd_task = NULL;
c94a62aa 2354 remove_proc_entry("apm", NULL);
fc09561d 2355 return err;
1da177e4 2356 }
fc09561d
SH		 2357 kapmd_task->flags |= PF_NOFREEZE;
2358 wake_up_process(kapmd_task);
1da177e4
LT		 2359
2360 if (num_online_cpus() > 1 && !smp ) {
2361 printk(KERN_NOTICE
2362 "apm: disabled - APM is not SMP safe (power off active).\n");
2363 return 0;
2364 }
2365
c94a62aa
NH		 2366 /*
2367 * Note we don't actually care if the misc_device cannot be registered.
2368 * this driver can do its job without it, even if userspace can't
2369 * control it. just log the error
2370 */
2371 if (misc_register(&apm_device))
2372 printk(KERN_WARNING "apm: Could not register misc device.\n");
1da177e4
LT		 2373
2374 if (HZ != 100)
2375 idle_period = (idle_period * HZ) / 100;
2376 if (idle_threshold < 100) {
2377 original_pm_idle = pm_idle;
2378 pm_idle = apm_cpu_idle;
2379 set_pm_idle = 1;
2380 }
2381
2382 return 0;
2383}
2384
2385static void __exit apm_exit(void)
2386{
2387 int error;
2388
2389 if (set_pm_idle) {
2390 pm_idle = original_pm_idle;
2391 /*
2392 * We are about to unload the current idle thread pm callback
2393 * (pm_idle), Wait for all processors to update cached/local
2394 * copies of pm_idle before proceeding.
2395 */
2396 cpu_idle_wait();
2397 }
2398 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2399 && (apm_info.connection_version > 0x0100)) {
2400 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2401 if (error)
2402 apm_error("disengage power management", error);
2403 }
2404 misc_deregister(&apm_device);
2405 remove_proc_entry("apm", NULL);
2406 if (power_off)
2407 pm_power_off = NULL;
fc09561d
SH		 2408 if (kapmd_task) {
2409 kthread_stop(kapmd_task);
2410 kapmd_task = NULL;
2411 }
987d4613 2412#ifdef CONFIG_PM_LEGACY
1da177e4 2413 pm_active = 0;
987d4613 2414#endif
1da177e4
LT		 2415}
2416
2417module_init(apm_init);
2418module_exit(apm_exit);
2419
2420MODULE_AUTHOR("Stephen Rothwell");
2421MODULE_DESCRIPTION("Advanced Power Management");
2422MODULE_LICENSE("GPL");
2423module_param(debug, bool, 0644);
2424MODULE_PARM_DESC(debug, "Enable debug mode");
2425module_param(power_off, bool, 0444);
2426MODULE_PARM_DESC(power_off, "Enable power off");
2427module_param(bounce_interval, int, 0444);
2428MODULE_PARM_DESC(bounce_interval,
2429 "Set the number of ticks to ignore suspend bounces");
2430module_param(allow_ints, bool, 0444);
2431MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2432module_param(broken_psr, bool, 0444);
2433MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2434module_param(realmode_power_off, bool, 0444);
2435MODULE_PARM_DESC(realmode_power_off,
2436 "Switch to real mode before powering off");
2437module_param(idle_threshold, int, 0444);
2438MODULE_PARM_DESC(idle_threshold,
2439 "System idle percentage above which to make APM BIOS idle calls");
2440module_param(idle_period, int, 0444);
2441MODULE_PARM_DESC(idle_period,
2442 "Period (in sec/100) over which to caculate the idle percentage");
2443module_param(smp, bool, 0444);
2444MODULE_PARM_DESC(smp,
2445 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2446MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
Linux 6.x block layer and io_uring tree(s)