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[deliverable/linux.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:
201 * http://www.microsoft.com/hwdev/busbios/amp_12.htm]
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>
1da177e4
LT		 234
235#include "io_ports.h"
236
1da177e4
LT		 237extern unsigned long get_cmos_time(void);
238extern void machine_real_restart(unsigned char *, int);
239
240#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
241extern int (*console_blank_hook)(int);
242#endif
243
244/*
245 * The apm_bios device is one of the misc char devices.
246 * This is its minor number.
247 */
248#define APM_MINOR_DEV 134
249
250/*
251 * See Documentation/Config.help for the configuration options.
252 *
253 * Various options can be changed at boot time as follows:
254 * (We allow underscores for compatibility with the modules code)
255 * apm=on/off enable/disable APM
256 * [no-]allow[-_]ints allow interrupts during BIOS calls
257 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
258 * [no-]realmode[-_]power[-_]off switch to real mode before
259 * powering off
260 * [no-]debug log some debugging messages
261 * [no-]power[-_]off power off on shutdown
262 * [no-]smp Use apm even on an SMP box
263 * bounce[-_]interval=<n> number of ticks to ignore suspend
264 * bounces
265 * idle[-_]threshold=<n> System idle percentage above which to
266 * make APM BIOS idle calls. Set it to
267 * 100 to disable.
268 * idle[-_]period=<n> Period (in 1/100s of a second) over
269 * which the idle percentage is
270 * calculated.
271 */
272
273/* KNOWN PROBLEM MACHINES:
274 *
275 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
276 * [Confirmed by TI representative]
277 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
278 * [Confirmed by BIOS disassembly]
279 * [This may work now ...]
280 * P: Toshiba 1950S: battery life information only gets updated after resume
281 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
282 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
283 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
284 * Neale Banks <neale@lowendale.com.au> December 2000
285 *
286 * Legend: U = unusable with APM patches
287 * P = partially usable with APM patches
288 */
289
290/*
291 * Define as 1 to make the driver always call the APM BIOS busy
292 * routine even if the clock was not reported as slowed by the
293 * idle routine. Otherwise, define as 0.
294 */
295#define ALWAYS_CALL_BUSY 1
296
297/*
298 * Define to make the APM BIOS calls zero all data segment registers (so
299 * that an incorrect BIOS implementation will cause a kernel panic if it
300 * tries to write to arbitrary memory).
301 */
302#define APM_ZERO_SEGS
303
304#include "apm.h"
305
1da177e4
LT		 306/*
307 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
308 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
309 * David Chen <chen@ctpa04.mit.edu>
310 */
311#undef INIT_TIMER_AFTER_SUSPEND
312
313#ifdef INIT_TIMER_AFTER_SUSPEND
314#include <linux/timex.h>
315#include <asm/io.h>
316#include <linux/delay.h>
317#endif
318
319/*
320 * Need to poll the APM BIOS every second
321 */
322#define APM_CHECK_TIMEOUT (HZ)
323
324/*
325 * Ignore suspend events for this amount of time after a resume
326 */
327#define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
328
329/*
330 * Maximum number of events stored
331 */
332#define APM_MAX_EVENTS 20
333
334/*
335 * The per-file APM data
336 */
337struct apm_user {
338 int magic;
339 struct apm_user * next;
77617bd8
DP		 340 unsigned int suser: 1;
341 unsigned int writer: 1;
342 unsigned int reader: 1;
343 unsigned int suspend_wait: 1;
1da177e4
LT		 344 int suspend_result;
345 int suspends_pending;
346 int standbys_pending;
347 int suspends_read;
348 int standbys_read;
349 int event_head;
350 int event_tail;
351 apm_event_t events[APM_MAX_EVENTS];
352};
353
354/*
355 * The magic number in apm_user
356 */
357#define APM_BIOS_MAGIC 0x4101
358
359/*
360 * idle percentage above which bios idle calls are done
361 */
362#ifdef CONFIG_APM_CPU_IDLE
363#define DEFAULT_IDLE_THRESHOLD 95
364#else
365#define DEFAULT_IDLE_THRESHOLD 100
366#endif
367#define DEFAULT_IDLE_PERIOD (100 / 3)
368
369/*
370 * Local variables
371 */
372static struct {
373 unsigned long offset;
374 unsigned short segment;
375} apm_bios_entry;
376static int clock_slowed;
87af2ffd
AM		 377static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
378static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
1da177e4
LT		 379static int set_pm_idle;
380static int suspends_pending;
381static int standbys_pending;
382static int ignore_sys_suspend;
383static int ignore_normal_resume;
87af2ffd 384static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
1da177e4
LT		 385
386#ifdef CONFIG_APM_RTC_IS_GMT
387# define clock_cmos_diff 0
388# define got_clock_diff 1
389#else
390static long clock_cmos_diff;
391static int got_clock_diff;
392#endif
87af2ffd
AM		 393static int debug __read_mostly;
394static int smp __read_mostly;
1da177e4
LT		 395static int apm_disabled = -1;
396#ifdef CONFIG_SMP
397static int power_off;
398#else
399static int power_off = 1;
400#endif
401#ifdef CONFIG_APM_REAL_MODE_POWER_OFF
402static int realmode_power_off = 1;
403#else
404static int realmode_power_off;
405#endif
1da177e4
LT		 406#ifdef CONFIG_APM_ALLOW_INTS
407static int allow_ints = 1;
408#else
409static int allow_ints;
410#endif
411static int broken_psr;
412
413static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
414static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
415static struct apm_user * user_list;
416static DEFINE_SPINLOCK(user_list_lock);
87af2ffd 417static const struct desc_struct bad_bios_desc = { 0, 0x00409200 };
1da177e4 418
87af2ffd 419static const char driver_version[] = "1.16ac"; /* no spaces */
1da177e4 420
fc09561d
SH		 421static struct task_struct *kapmd_task;
422
1da177e4
LT		 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 */
87af2ffd 427static const char * const apm_event_name[] = {
1da177e4
LT		 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};
38e548ee 441#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
1da177e4
LT		 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};
38e548ee 472#define ERROR_COUNT ARRAY_SIZE(error_table)
1da177e4
LT		 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.
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) break;
489 if (i < ERROR_COUNT)
490 printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
491 else
492 printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
493 str, err);
494}
495
496/*
497 * Lock APM functionality to physical CPU 0
498 */
499
500#ifdef CONFIG_SMP
501
502static cpumask_t apm_save_cpus(void)
503{
504 cpumask_t x = current->cpus_allowed;
505 /* Some bioses don't like being called from CPU != 0 */
506 set_cpus_allowed(current, cpumask_of_cpu(0));
507 BUG_ON(smp_processor_id() != 0);
508 return x;
509}
510
511static inline void apm_restore_cpus(cpumask_t mask)
512{
513 set_cpus_allowed(current, mask);
514}
515
516#else
517
518/*
519 * No CPU lockdown needed on a uniprocessor
520 */
521
522#define apm_save_cpus() (current->cpus_allowed)
523#define apm_restore_cpus(x) (void)(x)
524
525#endif
526
527/*
528 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
529 * apm_info.allow_ints, we are being really paranoid here! Not only
530 * are interrupts disabled, but all the segment registers (except SS)
531 * are saved and zeroed this means that if the BIOS tries to reference
532 * any data without explicitly loading the segment registers, the kernel
533 * will fault immediately rather than have some unforeseen circumstances
534 * for the rest of the kernel. And it will be very obvious! :-) Doing
535 * this depends on CS referring to the same physical memory as DS so that
536 * DS can be zeroed before the call. Unfortunately, we can't do anything
537 * about the stack segment/pointer. Also, we tell the compiler that
538 * everything could change.
539 *
540 * Also, we KNOW that for the non error case of apm_bios_call, there
541 * is no useful data returned in the low order 8 bits of eax.
542 */
3864c489
PZ		 543
544static inline unsigned long __apm_irq_save(void)
545{
546 unsigned long flags;
547 local_save_flags(flags);
548 if (apm_info.allow_ints) {
549 if (irqs_disabled_flags(flags))
550 local_irq_enable();
551 } else
552 local_irq_disable();
553
554 return flags;
555}
556
557#define apm_irq_save(flags) \
558 do { flags = __apm_irq_save(); } while (0)
559
560static inline void apm_irq_restore(unsigned long flags)
561{
562 if (irqs_disabled_flags(flags))
1da177e4 563 local_irq_disable();
3864c489
PZ		 564 else if (irqs_disabled())
565 local_irq_enable();
566}
1da177e4
LT		 567
568#ifdef APM_ZERO_SEGS
569# define APM_DECL_SEGS \
570 unsigned int saved_fs; unsigned int saved_gs;
571# define APM_DO_SAVE_SEGS \
572 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
573# define APM_DO_RESTORE_SEGS \
574 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
575#else
576# define APM_DECL_SEGS
577# define APM_DO_SAVE_SEGS
578# define APM_DO_RESTORE_SEGS
579#endif
580
581/**
582 * apm_bios_call - Make an APM BIOS 32bit call
583 * @func: APM function to execute
584 * @ebx_in: EBX register for call entry
585 * @ecx_in: ECX register for call entry
586 * @eax: EAX register return
587 * @ebx: EBX register return
588 * @ecx: ECX register return
589 * @edx: EDX register return
590 * @esi: ESI register return
591 *
592 * Make an APM call using the 32bit protected mode interface. The
593 * caller is responsible for knowing if APM BIOS is configured and
594 * enabled. This call can disable interrupts for a long period of
595 * time on some laptops. The return value is in AH and the carry
596 * flag is loaded into AL. If there is an error, then the error
597 * code is returned in AH (bits 8-15 of eax) and this function
598 * returns non-zero.
599 */
600
601static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in,
602 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi)
603{
604 APM_DECL_SEGS
605 unsigned long flags;
606 cpumask_t cpus;
607 int cpu;
608 struct desc_struct save_desc_40;
251e6912 609 struct desc_struct *gdt;
1da177e4
LT		 610
611 cpus = apm_save_cpus();
612
613 cpu = get_cpu();
251e6912
ZA		 614 gdt = get_cpu_gdt_table(cpu);
615 save_desc_40 = gdt[0x40 / 8];
616 gdt[0x40 / 8] = bad_bios_desc;
1da177e4 617
3864c489 618 apm_irq_save(flags);
1da177e4
LT		 619 APM_DO_SAVE_SEGS;
620 apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi);
621 APM_DO_RESTORE_SEGS;
3864c489 622 apm_irq_restore(flags);
251e6912 623 gdt[0x40 / 8] = save_desc_40;
1da177e4
LT		 624 put_cpu();
625 apm_restore_cpus(cpus);
626
627 return *eax & 0xff;
628}
629
630/**
631 * apm_bios_call_simple - make a simple APM BIOS 32bit call
632 * @func: APM function to invoke
633 * @ebx_in: EBX register value for BIOS call
634 * @ecx_in: ECX register value for BIOS call
635 * @eax: EAX register on return from the BIOS call
636 *
87af2ffd 637 * Make a BIOS call that returns one value only, or just status.
1da177e4
LT		 638 * If there is an error, then the error code is returned in AH
639 * (bits 8-15 of eax) and this function returns non-zero. This is
640 * used for simpler BIOS operations. This call may hold interrupts
641 * off for a long time on some laptops.
642 */
643
644static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax)
645{
646 u8 error;
647 APM_DECL_SEGS
648 unsigned long flags;
649 cpumask_t cpus;
650 int cpu;
651 struct desc_struct save_desc_40;
251e6912 652 struct desc_struct *gdt;
1da177e4
LT		 653
654 cpus = apm_save_cpus();
655
656 cpu = get_cpu();
251e6912
ZA		 657 gdt = get_cpu_gdt_table(cpu);
658 save_desc_40 = gdt[0x40 / 8];
659 gdt[0x40 / 8] = bad_bios_desc;
1da177e4 660
3864c489 661 apm_irq_save(flags);
1da177e4
LT		 662 APM_DO_SAVE_SEGS;
663 error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax);
664 APM_DO_RESTORE_SEGS;
3864c489 665 apm_irq_restore(flags);
251e6912 666 gdt[0x40 / 8] = save_desc_40;
1da177e4
LT		 667 put_cpu();
668 apm_restore_cpus(cpus);
669 return error;
670}
671
672/**
673 * apm_driver_version - APM driver version
674 * @val: loaded with the APM version on return
675 *
676 * Retrieve the APM version supported by the BIOS. This is only
677 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
678 * probably present.
679 *
680 * On entry val should point to a value indicating the APM driver
681 * version with the high byte being the major and the low byte the
682 * minor number both in BCD
683 *
684 * On return it will hold the BIOS revision supported in the
685 * same format.
686 */
687
688static int apm_driver_version(u_short *val)
689{
690 u32 eax;
691
692 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax))
693 return (eax >> 8) & 0xff;
694 *val = eax;
695 return APM_SUCCESS;
696}
697
698/**
699 * apm_get_event - get an APM event from the BIOS
700 * @event: pointer to the event
701 * @info: point to the event information
702 *
703 * The APM BIOS provides a polled information for event
704 * reporting. The BIOS expects to be polled at least every second
705 * when events are pending. When a message is found the caller should
706 * poll until no more messages are present. However, this causes
707 * problems on some laptops where a suspend event notification is
708 * not cleared until it is acknowledged.
709 *
710 * Additional information is returned in the info pointer, providing
711 * that APM 1.2 is in use. If no messges are pending the value 0x80
712 * is returned (No power management events pending).
713 */
714
715static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
716{
717 u32 eax;
718 u32 ebx;
719 u32 ecx;
720 u32 dummy;
721
722 if (apm_bios_call(APM_FUNC_GET_EVENT, 0, 0, &eax, &ebx, &ecx,
723 &dummy, &dummy))
724 return (eax >> 8) & 0xff;
725 *event = ebx;
726 if (apm_info.connection_version < 0x0102)
727 *info = ~0; /* indicate info not valid */
728 else
729 *info = ecx;
730 return APM_SUCCESS;
731}
732
733/**
734 * set_power_state - set the power management state
735 * @what: which items to transition
736 * @state: state to transition to
737 *
738 * Request an APM change of state for one or more system devices. The
739 * processor state must be transitioned last of all. what holds the
740 * class of device in the upper byte and the device number (0xFF for
741 * all) for the object to be transitioned.
742 *
743 * The state holds the state to transition to, which may in fact
744 * be an acceptance of a BIOS requested state change.
745 */
746
747static int set_power_state(u_short what, u_short state)
748{
749 u32 eax;
750
751 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax))
752 return (eax >> 8) & 0xff;
753 return APM_SUCCESS;
754}
755
756/**
757 * set_system_power_state - set system wide power state
758 * @state: which state to enter
759 *
760 * Transition the entire system into a new APM power state.
761 */
762
763static int set_system_power_state(u_short state)
764{
765 return set_power_state(APM_DEVICE_ALL, state);
766}
767
768/**
769 * apm_do_idle - perform power saving
770 *
771 * This function notifies the BIOS that the processor is (in the view
772 * of the OS) idle. It returns -1 in the event that the BIOS refuses
773 * to handle the idle request. On a success the function returns 1
774 * if the BIOS did clock slowing or 0 otherwise.
775 */
776
777static int apm_do_idle(void)
778{
779 u32 eax;
64c7c8f8
NP		 780 u8 ret = 0;
781 int idled = 0;
782 int polling;
783
495ab9c0 784 polling = !!(current_thread_info()->status & TS_POLLING);
64c7c8f8 785 if (polling) {
495ab9c0 786 current_thread_info()->status &= ~TS_POLLING;
64c7c8f8
NP		 787 smp_mb__after_clear_bit();
788 }
789 if (!need_resched()) {
790 idled = 1;
791 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax);
792 }
793 if (polling)
495ab9c0 794 current_thread_info()->status |= TS_POLLING;
64c7c8f8
NP		 795
796 if (!idled)
797 return 0;
798
799 if (ret) {
1da177e4
LT		 800 static unsigned long t;
801
802 /* This always fails on some SMP boards running UP kernels.
803 * Only report the failure the first 5 times.
804 */
805 if (++t < 5)
806 {
807 printk(KERN_DEBUG "apm_do_idle failed (%d)\n",
808 (eax >> 8) & 0xff);
809 t = jiffies;
810 }
811 return -1;
812 }
813 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
814 return clock_slowed;
815}
816
817/**
818 * apm_do_busy - inform the BIOS the CPU is busy
819 *
820 * Request that the BIOS brings the CPU back to full performance.
821 */
822
823static void apm_do_busy(void)
824{
825 u32 dummy;
826
827 if (clock_slowed || ALWAYS_CALL_BUSY) {
828 (void) apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy);
829 clock_slowed = 0;
830 }
831}
832
833/*
834 * If no process has really been interested in
835 * the CPU for some time, we want to call BIOS
836 * power management - we probably want
837 * to conserve power.
838 */
839#define IDLE_CALC_LIMIT (HZ * 100)
840#define IDLE_LEAKY_MAX 16
841
87af2ffd 842static void (*original_pm_idle)(void) __read_mostly;
1da177e4 843
1da177e4
LT		 844/**
845 * apm_cpu_idle - cpu idling for APM capable Linux
846 *
847 * This is the idling function the kernel executes when APM is available. It
848 * tries to do BIOS powermanagement based on the average system idle time.
849 * Furthermore it calls the system default idle routine.
850 */
851
852static void apm_cpu_idle(void)
853{
854 static int use_apm_idle; /* = 0 */
855 static unsigned int last_jiffies; /* = 0 */
856 static unsigned int last_stime; /* = 0 */
857
858 int apm_idle_done = 0;
859 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
860 unsigned int bucket;
861
862recalc:
863 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
864 use_apm_idle = 0;
865 last_jiffies = jiffies;
866 last_stime = current->stime;
867 } else if (jiffies_since_last_check > idle_period) {
868 unsigned int idle_percentage;
869
870 idle_percentage = current->stime - last_stime;
871 idle_percentage *= 100;
872 idle_percentage /= jiffies_since_last_check;
873 use_apm_idle = (idle_percentage > idle_threshold);
874 if (apm_info.forbid_idle)
875 use_apm_idle = 0;
876 last_jiffies = jiffies;
877 last_stime = current->stime;
878 }
879
880 bucket = IDLE_LEAKY_MAX;
881
882 while (!need_resched()) {
883 if (use_apm_idle) {
884 unsigned int t;
885
886 t = jiffies;
887 switch (apm_do_idle()) {
888 case 0: apm_idle_done = 1;
889 if (t != jiffies) {
890 if (bucket) {
891 bucket = IDLE_LEAKY_MAX;
892 continue;
893 }
894 } else if (bucket) {
895 bucket--;
896 continue;
897 }
898 break;
899 case 1: apm_idle_done = 1;
900 break;
901 default: /* BIOS refused */
902 break;
903 }
904 }
905 if (original_pm_idle)
906 original_pm_idle();
907 else
908 default_idle();
909 jiffies_since_last_check = jiffies - last_jiffies;
910 if (jiffies_since_last_check > idle_period)
911 goto recalc;
912 }
913
914 if (apm_idle_done)
915 apm_do_busy();
916}
917
918/**
919 * apm_power_off - ask the BIOS to power off
920 *
921 * Handle the power off sequence. This is the one piece of code we
922 * will execute even on SMP machines. In order to deal with BIOS
923 * bugs we support real mode APM BIOS power off calls. We also make
924 * the SMP call on CPU0 as some systems will only honour this call
925 * on their first cpu.
926 */
927
928static void apm_power_off(void)
929{
930 unsigned char po_bios_call[] = {
931 0xb8, 0x00, 0x10, /* movw $0x1000,ax */
932 0x8e, 0xd0, /* movw ax,ss */
933 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
934 0xb8, 0x07, 0x53, /* movw $0x5307,ax */
935 0xbb, 0x01, 0x00, /* movw $0x0001,bx */
936 0xb9, 0x03, 0x00, /* movw $0x0003,cx */
937 0xcd, 0x15 /* int $0x15 */
938 };
939
1da177e4 940 /* Some bioses don't like being called from CPU != 0 */
1da177e4
LT		 941 if (apm_info.realmode_power_off)
942 {
943 (void)apm_save_cpus();
944 machine_real_restart(po_bios_call, sizeof(po_bios_call));
945 }
946 else
947 (void) set_system_power_state(APM_STATE_OFF);
948}
949
950#ifdef CONFIG_APM_DO_ENABLE
951
952/**
953 * apm_enable_power_management - enable BIOS APM power management
954 * @enable: enable yes/no
955 *
956 * Enable or disable the APM BIOS power services.
957 */
958
959static int apm_enable_power_management(int enable)
960{
961 u32 eax;
962
963 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
964 return APM_NOT_ENGAGED;
965 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
966 enable, &eax))
967 return (eax >> 8) & 0xff;
968 if (enable)
969 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
970 else
971 apm_info.bios.flags |= APM_BIOS_DISABLED;
972 return APM_SUCCESS;
973}
974#endif
975
976/**
977 * apm_get_power_status - get current power state
978 * @status: returned status
979 * @bat: battery info
980 * @life: estimated life
981 *
982 * Obtain the current power status from the APM BIOS. We return a
983 * status which gives the rough battery status, and current power
984 * source. The bat value returned give an estimate as a percentage
985 * of life and a status value for the battery. The estimated life
986 * if reported is a lifetime in secodnds/minutes at current powwer
987 * consumption.
988 */
989
990static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
991{
992 u32 eax;
993 u32 ebx;
994 u32 ecx;
995 u32 edx;
996 u32 dummy;
997
998 if (apm_info.get_power_status_broken)
999 return APM_32_UNSUPPORTED;
1000 if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0,
1001 &eax, &ebx, &ecx, &edx, &dummy))
1002 return (eax >> 8) & 0xff;
1003 *status = ebx;
1004 *bat = ecx;
1005 if (apm_info.get_power_status_swabinminutes) {
1006 *life = swab16((u16)edx);
1007 *life |= 0x8000;
1008 } else
1009 *life = edx;
1010 return APM_SUCCESS;
1011}
1012
1013#if 0
1014static int apm_get_battery_status(u_short which, u_short *status,
1015 u_short *bat, u_short *life, u_short *nbat)
1016{
1017 u32 eax;
1018 u32 ebx;
1019 u32 ecx;
1020 u32 edx;
1021 u32 esi;
1022
1023 if (apm_info.connection_version < 0x0102) {
1024 /* pretend we only have one battery. */
1025 if (which != 1)
1026 return APM_BAD_DEVICE;
1027 *nbat = 1;
1028 return apm_get_power_status(status, bat, life);
1029 }
1030
1031 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1032 &ebx, &ecx, &edx, &esi))
1033 return (eax >> 8) & 0xff;
1034 *status = ebx;
1035 *bat = ecx;
1036 *life = edx;
1037 *nbat = esi;
1038 return APM_SUCCESS;
1039}
1040#endif
1041
1042/**
1043 * apm_engage_power_management - enable PM on a device
1044 * @device: identity of device
1045 * @enable: on/off
1046 *
1047 * Activate or deactive power management on either a specific device
1048 * or the entire system (%APM_DEVICE_ALL).
1049 */
1050
1051static int apm_engage_power_management(u_short device, int enable)
1052{
1053 u32 eax;
1054
1055 if ((enable == 0) && (device == APM_DEVICE_ALL)
1056 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1057 return APM_DISABLED;
1058 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax))
1059 return (eax >> 8) & 0xff;
1060 if (device == APM_DEVICE_ALL) {
1061 if (enable)
1062 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1063 else
1064 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1065 }
1066 return APM_SUCCESS;
1067}
1068
1069#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1070
1071/**
1072 * apm_console_blank - blank the display
1073 * @blank: on/off
1074 *
1075 * Attempt to blank the console, firstly by blanking just video device
1076 * zero, and if that fails (some BIOSes don't support it) then it blanks
1077 * all video devices. Typically the BIOS will do laptop backlight and
1078 * monitor powerdown for us.
1079 */
1080
1081static int apm_console_blank(int blank)
1082{
87af2ffd
AM		 1083 int error = APM_NOT_ENGAGED; /* silence gcc */
1084 int i;
3841b0a1
JC		 1085 u_short state;
1086 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1da177e4
LT		 1087
1088 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
3841b0a1
JC		 1089
1090 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1091 error = set_power_state(dev[i], state);
1092
1093 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1094 return 1;
1095
1096 if (error == APM_NOT_ENGAGED)
1097 break;
1da177e4 1098 }
3841b0a1 1099
73374454 1100 if (error == APM_NOT_ENGAGED) {
1da177e4
LT		 1101 static int tried;
1102 int eng_error;
1103 if (tried++ == 0) {
1104 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1105 if (eng_error) {
1106 apm_error("set display", error);
1107 apm_error("engage interface", eng_error);
1108 return 0;
1109 } else
1110 return apm_console_blank(blank);
1111 }
1112 }
1113 apm_error("set display", error);
1114 return 0;
1115}
1116#endif
1117
1118static int queue_empty(struct apm_user *as)
1119{
1120 return as->event_head == as->event_tail;
1121}
1122
1123static apm_event_t get_queued_event(struct apm_user *as)
1124{
87af2ffd
AM		 1125 if (++as->event_tail >= APM_MAX_EVENTS)
1126 as->event_tail = 0;
1da177e4
LT		 1127 return as->events[as->event_tail];
1128}
1129
1130static void queue_event(apm_event_t event, struct apm_user *sender)
1131{
1132 struct apm_user * as;
1133
1134 spin_lock(&user_list_lock);
1135 if (user_list == NULL)
1136 goto out;
1137 for (as = user_list; as != NULL; as = as->next) {
1138 if ((as == sender) || (!as->reader))
1139 continue;
87af2ffd
AM		 1140 if (++as->event_head >= APM_MAX_EVENTS)
1141 as->event_head = 0;
1142
1da177e4
LT		 1143 if (as->event_head == as->event_tail) {
1144 static int notified;
1145
1146 if (notified++ == 0)
1147 printk(KERN_ERR "apm: an event queue overflowed\n");
87af2ffd
AM		 1148 if (++as->event_tail >= APM_MAX_EVENTS)
1149 as->event_tail = 0;
1da177e4
LT		 1150 }
1151 as->events[as->event_head] = event;
1152 if ((!as->suser) || (!as->writer))
1153 continue;
1154 switch (event) {
1155 case APM_SYS_SUSPEND:
1156 case APM_USER_SUSPEND:
1157 as->suspends_pending++;
1158 suspends_pending++;
1159 break;
1160
1161 case APM_SYS_STANDBY:
1162 case APM_USER_STANDBY:
1163 as->standbys_pending++;
1164 standbys_pending++;
1165 break;
1166 }
1167 }
1168 wake_up_interruptible(&apm_waitqueue);
1169out:
1170 spin_unlock(&user_list_lock);
1171}
1172
1173static void set_time(void)
1174{
c7f40ff1 1175 struct timespec ts;
1da177e4 1176 if (got_clock_diff) { /* Must know time zone in order to set clock */
c7f40ff1 1177 ts.tv_sec = get_cmos_time() + clock_cmos_diff;
1178 ts.tv_nsec = 0;
1179 do_settimeofday(&ts);
1da177e4
LT		 1180 }
1181}
1182
1183static void get_time_diff(void)
1184{
1185#ifndef CONFIG_APM_RTC_IS_GMT
1186 /*
1187 * Estimate time zone so that set_time can update the clock
1188 */
1189 clock_cmos_diff = -get_cmos_time();
1190 clock_cmos_diff += get_seconds();
1191 got_clock_diff = 1;
1192#endif
1193}
1194
1195static void reinit_timer(void)
1196{
1197#ifdef INIT_TIMER_AFTER_SUSPEND
306e440d 1198 unsigned long flags;
1da177e4
LT		 1199
1200 spin_lock_irqsave(&i8253_lock, flags);
1201 /* set the clock to 100 Hz */
1202 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1203 udelay(10);
1204 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1205 udelay(10);
1206 outb(LATCH >> 8, PIT_CH0); /* MSB */
1207 udelay(10);
1208 spin_unlock_irqrestore(&i8253_lock, flags);
1209#endif
1210}
1211
1212static int suspend(int vetoable)
1213{
1214 int err;
1215 struct apm_user *as;
1216
1217 if (pm_send_all(PM_SUSPEND, (void *)3)) {
1218 /* Vetoed */
1219 if (vetoable) {
1220 if (apm_info.connection_version > 0x100)
1221 set_system_power_state(APM_STATE_REJECT);
1222 err = -EBUSY;
1223 ignore_sys_suspend = 0;
1224 printk(KERN_WARNING "apm: suspend was vetoed.\n");
1225 goto out;
1226 }
1227 printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
1228 }
1229
1230 device_suspend(PMSG_SUSPEND);
1231 local_irq_disable();
1232 device_power_down(PMSG_SUSPEND);
1233
1234 /* serialize with the timer interrupt */
1235 write_seqlock(&xtime_lock);
1236
1237 /* protect against access to timer chip registers */
1238 spin_lock(&i8253_lock);
1239
1240 get_time_diff();
1241 /*
1242 * Irq spinlock must be dropped around set_system_power_state.
1243 * We'll undo any timer changes due to interrupts below.
1244 */
1245 spin_unlock(&i8253_lock);
1246 write_sequnlock(&xtime_lock);
1247 local_irq_enable();
1248
1249 save_processor_state();
1250 err = set_system_power_state(APM_STATE_SUSPEND);
92c6dc59 1251 ignore_normal_resume = 1;
1da177e4
LT		 1252 restore_processor_state();
1253
1254 local_irq_disable();
1da177e4 1255 set_time();
c7f40ff1 1256 reinit_timer();
1da177e4
LT		 1257
1258 if (err == APM_NO_ERROR)
1259 err = APM_SUCCESS;
1260 if (err != APM_SUCCESS)
1261 apm_error("suspend", err);
1262 err = (err == APM_SUCCESS) ? 0 : -EIO;
1263 device_power_up();
1264 local_irq_enable();
1265 device_resume();
1266 pm_send_all(PM_RESUME, (void *)0);
1267 queue_event(APM_NORMAL_RESUME, NULL);
1268 out:
1269 spin_lock(&user_list_lock);
1270 for (as = user_list; as != NULL; as = as->next) {
1271 as->suspend_wait = 0;
1272 as->suspend_result = err;
1273 }
1274 spin_unlock(&user_list_lock);
1275 wake_up_interruptible(&apm_suspend_waitqueue);
1276 return err;
1277}
1278
1279static void standby(void)
1280{
1281 int err;
1282
1283 local_irq_disable();
1284 device_power_down(PMSG_SUSPEND);
1285 /* serialize with the timer interrupt */
1286 write_seqlock(&xtime_lock);
1287 /* If needed, notify drivers here */
1288 get_time_diff();
1289 write_sequnlock(&xtime_lock);
1290 local_irq_enable();
1291
1292 err = set_system_power_state(APM_STATE_STANDBY);
1293 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1294 apm_error("standby", err);
1295
1296 local_irq_disable();
1297 device_power_up();
1298 local_irq_enable();
1299}
1300
1301static apm_event_t get_event(void)
1302{
1303 int error;
87af2ffd 1304 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1da177e4
LT		 1305 apm_eventinfo_t info;
1306
1307 static int notified;
1308
1309 /* we don't use the eventinfo */
1310 error = apm_get_event(&event, &info);
1311 if (error == APM_SUCCESS)
1312 return event;
1313
1314 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1315 apm_error("get_event", error);
1316
1317 return 0;
1318}
1319
1320static void check_events(void)
1321{
1322 apm_event_t event;
1323 static unsigned long last_resume;
1324 static int ignore_bounce;
1325
1326 while ((event = get_event()) != 0) {
1327 if (debug) {
1328 if (event <= NR_APM_EVENT_NAME)
1329 printk(KERN_DEBUG "apm: received %s notify\n",
1330 apm_event_name[event - 1]);
1331 else
1332 printk(KERN_DEBUG "apm: received unknown "
1333 "event 0x%02x\n", event);
1334 }
1335 if (ignore_bounce
1336 && ((jiffies - last_resume) > bounce_interval))
1337 ignore_bounce = 0;
1338
1339 switch (event) {
1340 case APM_SYS_STANDBY:
1341 case APM_USER_STANDBY:
1342 queue_event(event, NULL);
1343 if (standbys_pending <= 0)
1344 standby();
1345 break;
1346
1347 case APM_USER_SUSPEND:
1348#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1349 if (apm_info.connection_version > 0x100)
1350 set_system_power_state(APM_STATE_REJECT);
1351 break;
1352#endif
1353 case APM_SYS_SUSPEND:
1354 if (ignore_bounce) {
1355 if (apm_info.connection_version > 0x100)
1356 set_system_power_state(APM_STATE_REJECT);
1357 break;
1358 }
1359 /*
1360 * If we are already processing a SUSPEND,
1361 * then further SUSPEND events from the BIOS
1362 * will be ignored. We also return here to
1363 * cope with the fact that the Thinkpads keep
1364 * sending a SUSPEND event until something else
1365 * happens!
1366 */
1367 if (ignore_sys_suspend)
1368 return;
1369 ignore_sys_suspend = 1;
1370 queue_event(event, NULL);
1371 if (suspends_pending <= 0)
1372 (void) suspend(1);
1373 break;
1374
1375 case APM_NORMAL_RESUME:
1376 case APM_CRITICAL_RESUME:
1377 case APM_STANDBY_RESUME:
1378 ignore_sys_suspend = 0;
1379 last_resume = jiffies;
1380 ignore_bounce = 1;
1381 if ((event != APM_NORMAL_RESUME)
1382 || (ignore_normal_resume == 0)) {
1da177e4 1383 set_time();
1da177e4
LT		 1384 device_resume();
1385 pm_send_all(PM_RESUME, (void *)0);
1386 queue_event(event, NULL);
1387 }
1388 ignore_normal_resume = 0;
1389 break;
1390
1391 case APM_CAPABILITY_CHANGE:
1392 case APM_LOW_BATTERY:
1393 case APM_POWER_STATUS_CHANGE:
1394 queue_event(event, NULL);
1395 /* If needed, notify drivers here */
1396 break;
1397
1398 case APM_UPDATE_TIME:
1da177e4 1399 set_time();
1da177e4
LT		 1400 break;
1401
1402 case APM_CRITICAL_SUSPEND:
1403 /*
1404 * We are not allowed to reject a critical suspend.
1405 */
1406 (void) suspend(0);
1407 break;
1408 }
1409 }
1410}
1411
1412static void apm_event_handler(void)
1413{
1414 static int pending_count = 4;
1415 int err;
1416
1417 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1418 if ((apm_info.connection_version > 0x100) &&
1419 (pending_count-- <= 0)) {
1420 pending_count = 4;
1421 if (debug)
1422 printk(KERN_DEBUG "apm: setting state busy\n");
1423 err = set_system_power_state(APM_STATE_BUSY);
1424 if (err)
1425 apm_error("busy", err);
1426 }
1427 } else
1428 pending_count = 4;
1429 check_events();
1430}
1431
1432/*
1433 * This is the APM thread main loop.
1434 */
1435
1436static void apm_mainloop(void)
1437{
1438 DECLARE_WAITQUEUE(wait, current);
1439
1440 add_wait_queue(&apm_waitqueue, &wait);
1441 set_current_state(TASK_INTERRUPTIBLE);
1442 for (;;) {
1443 schedule_timeout(APM_CHECK_TIMEOUT);
fc09561d 1444 if (kthread_should_stop())
1da177e4
LT		 1445 break;
1446 /*
1447 * Ok, check all events, check for idle (and mark us sleeping
1448 * so as not to count towards the load average)..
1449 */
1450 set_current_state(TASK_INTERRUPTIBLE);
1451 apm_event_handler();
1452 }
1453 remove_wait_queue(&apm_waitqueue, &wait);
1454}
1455
1456static int check_apm_user(struct apm_user *as, const char *func)
1457{
1458 if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) {
1459 printk(KERN_ERR "apm: %s passed bad filp\n", func);
1460 return 1;
1461 }
1462 return 0;
1463}
1464
1465static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1466{
1467 struct apm_user * as;
1468 int i;
1469 apm_event_t event;
1470
1471 as = fp->private_data;
1472 if (check_apm_user(as, "read"))
1473 return -EIO;
1474 if ((int)count < sizeof(apm_event_t))
1475 return -EINVAL;
1476 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1477 return -EAGAIN;
1478 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1479 i = count;
1480 while ((i >= sizeof(event)) && !queue_empty(as)) {
1481 event = get_queued_event(as);
1482 if (copy_to_user(buf, &event, sizeof(event))) {
1483 if (i < count)
1484 break;
1485 return -EFAULT;
1486 }
1487 switch (event) {
1488 case APM_SYS_SUSPEND:
1489 case APM_USER_SUSPEND:
1490 as->suspends_read++;
1491 break;
1492
1493 case APM_SYS_STANDBY:
1494 case APM_USER_STANDBY:
1495 as->standbys_read++;
1496 break;
1497 }
1498 buf += sizeof(event);
1499 i -= sizeof(event);
1500 }
1501 if (i < count)
1502 return count - i;
1503 if (signal_pending(current))
1504 return -ERESTARTSYS;
1505 return 0;
1506}
1507
1508static unsigned int do_poll(struct file *fp, poll_table * wait)
1509{
1510 struct apm_user * as;
1511
1512 as = fp->private_data;
1513 if (check_apm_user(as, "poll"))
1514 return 0;
1515 poll_wait(fp, &apm_waitqueue, wait);
1516 if (!queue_empty(as))
1517 return POLLIN | POLLRDNORM;
1518 return 0;
1519}
1520
1521static int do_ioctl(struct inode * inode, struct file *filp,
1522 u_int cmd, u_long arg)
1523{
1524 struct apm_user * as;
1525
1526 as = filp->private_data;
1527 if (check_apm_user(as, "ioctl"))
1528 return -EIO;
1529 if ((!as->suser) || (!as->writer))
1530 return -EPERM;
1531 switch (cmd) {
1532 case APM_IOC_STANDBY:
1533 if (as->standbys_read > 0) {
1534 as->standbys_read--;
1535 as->standbys_pending--;
1536 standbys_pending--;
1537 } else
1538 queue_event(APM_USER_STANDBY, as);
1539 if (standbys_pending <= 0)
1540 standby();
1541 break;
1542 case APM_IOC_SUSPEND:
1543 if (as->suspends_read > 0) {
1544 as->suspends_read--;
1545 as->suspends_pending--;
1546 suspends_pending--;
1547 } else
1548 queue_event(APM_USER_SUSPEND, as);
1549 if (suspends_pending <= 0) {
1550 return suspend(1);
1551 } else {
1552 as->suspend_wait = 1;
1553 wait_event_interruptible(apm_suspend_waitqueue,
1554 as->suspend_wait == 0);
1555 return as->suspend_result;
1556 }
1557 break;
1558 default:
1559 return -EINVAL;
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 = (struct apm_user *)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 apm_get_info(char *buf, char **start, off_t fpos, int length)
1635{
1636 char * p;
1637 unsigned short bx;
1638 unsigned short cx;
1639 unsigned short dx;
1640 int error;
1641 unsigned short ac_line_status = 0xff;
1642 unsigned short battery_status = 0xff;
1643 unsigned short battery_flag = 0xff;
1644 int percentage = -1;
1645 int time_units = -1;
1646 char *units = "?";
1647
1648 p = buf;
1649
1650 if ((num_online_cpus() == 1) &&
1651 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1652 ac_line_status = (bx >> 8) & 0xff;
1653 battery_status = bx & 0xff;
1654 if ((cx & 0xff) != 0xff)
1655 percentage = cx & 0xff;
1656
1657 if (apm_info.connection_version > 0x100) {
1658 battery_flag = (cx >> 8) & 0xff;
1659 if (dx != 0xffff) {
1660 units = (dx & 0x8000) ? "min" : "sec";
1661 time_units = dx & 0x7fff;
1662 }
1663 }
1664 }
1665 /* Arguments, with symbols from linux/apm_bios.h. Information is
1666 from the Get Power Status (0x0a) call unless otherwise noted.
1667
1668 0) Linux driver version (this will change if format changes)
1669 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1670 2) APM flags from APM Installation Check (0x00):
1671 bit 0: APM_16_BIT_SUPPORT
1672 bit 1: APM_32_BIT_SUPPORT
1673 bit 2: APM_IDLE_SLOWS_CLOCK
1674 bit 3: APM_BIOS_DISABLED
1675 bit 4: APM_BIOS_DISENGAGED
1676 3) AC line status
1677 0x00: Off-line
1678 0x01: On-line
1679 0x02: On backup power (BIOS >= 1.1 only)
1680 0xff: Unknown
1681 4) Battery status
1682 0x00: High
1683 0x01: Low
1684 0x02: Critical
1685 0x03: Charging
1686 0x04: Selected battery not present (BIOS >= 1.2 only)
1687 0xff: Unknown
1688 5) Battery flag
1689 bit 0: High
1690 bit 1: Low
1691 bit 2: Critical
1692 bit 3: Charging
1693 bit 7: No system battery
1694 0xff: Unknown
1695 6) Remaining battery life (percentage of charge):
1696 0-100: valid
1697 -1: Unknown
1698 7) Remaining battery life (time units):
1699 Number of remaining minutes or seconds
1700 -1: Unknown
1701 8) min = minutes; sec = seconds */
1702
1703 p += sprintf(p, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1704 driver_version,
1705 (apm_info.bios.version >> 8) & 0xff,
1706 apm_info.bios.version & 0xff,
1707 apm_info.bios.flags,
1708 ac_line_status,
1709 battery_status,
1710 battery_flag,
1711 percentage,
1712 time_units,
1713 units);
1714
1715 return p - buf;
1716}
1717
1718static int apm(void *unused)
1719{
1720 unsigned short bx;
1721 unsigned short cx;
1722 unsigned short dx;
1723 int error;
1724 char * power_stat;
1725 char * bat_stat;
1726
1da177e4
LT		 1727#ifdef CONFIG_SMP
1728 /* 2002/08/01 - WT
1729 * This is to avoid random crashes at boot time during initialization
1730 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1731 * Some bioses don't like being called from CPU != 0.
1732 * Method suggested by Ingo Molnar.
1733 */
1734 set_cpus_allowed(current, cpumask_of_cpu(0));
1735 BUG_ON(smp_processor_id() != 0);
1736#endif
1737
1738 if (apm_info.connection_version == 0) {
1739 apm_info.connection_version = apm_info.bios.version;
1740 if (apm_info.connection_version > 0x100) {
1741 /*
1742 * We only support BIOSs up to version 1.2
1743 */
1744 if (apm_info.connection_version > 0x0102)
1745 apm_info.connection_version = 0x0102;
1746 error = apm_driver_version(&apm_info.connection_version);
1747 if (error != APM_SUCCESS) {
1748 apm_error("driver version", error);
1749 /* Fall back to an APM 1.0 connection. */
1750 apm_info.connection_version = 0x100;
1751 }
1752 }
1753 }
1754
1755 if (debug)
1756 printk(KERN_INFO "apm: Connection version %d.%d\n",
1757 (apm_info.connection_version >> 8) & 0xff,
1758 apm_info.connection_version & 0xff);
1759
1760#ifdef CONFIG_APM_DO_ENABLE
1761 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1762 /*
1763 * This call causes my NEC UltraLite Versa 33/C to hang if it
1764 * is booted with PM disabled but not in the docking station.
1765 * Unfortunate ...
1766 */
1767 error = apm_enable_power_management(1);
1768 if (error) {
1769 apm_error("enable power management", error);
1770 return -1;
1771 }
1772 }
1773#endif
1774
1775 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1776 && (apm_info.connection_version > 0x0100)) {
1777 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1778 if (error) {
1779 apm_error("engage power management", error);
1780 return -1;
1781 }
1782 }
1783
1784 if (debug && (num_online_cpus() == 1 || smp )) {
1785 error = apm_get_power_status(&bx, &cx, &dx);
1786 if (error)
1787 printk(KERN_INFO "apm: power status not available\n");
1788 else {
1789 switch ((bx >> 8) & 0xff) {
1790 case 0: power_stat = "off line"; break;
1791 case 1: power_stat = "on line"; break;
1792 case 2: power_stat = "on backup power"; break;
1793 default: power_stat = "unknown"; break;
1794 }
1795 switch (bx & 0xff) {
1796 case 0: bat_stat = "high"; break;
1797 case 1: bat_stat = "low"; break;
1798 case 2: bat_stat = "critical"; break;
1799 case 3: bat_stat = "charging"; break;
1800 default: bat_stat = "unknown"; break;
1801 }
1802 printk(KERN_INFO
1803 "apm: AC %s, battery status %s, battery life ",
1804 power_stat, bat_stat);
1805 if ((cx & 0xff) == 0xff)
1806 printk("unknown\n");
1807 else
1808 printk("%d%%\n", cx & 0xff);
1809 if (apm_info.connection_version > 0x100) {
1810 printk(KERN_INFO
1811 "apm: battery flag 0x%02x, battery life ",
1812 (cx >> 8) & 0xff);
1813 if (dx == 0xffff)
1814 printk("unknown\n");
1815 else
1816 printk("%d %s\n", dx & 0x7fff,
1817 (dx & 0x8000) ?
1818 "minutes" : "seconds");
1819 }
1820 }
1821 }
1822
1823 /* Install our power off handler.. */
1824 if (power_off)
1825 pm_power_off = apm_power_off;
1826
1827 if (num_online_cpus() == 1 || smp) {
1828#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1829 console_blank_hook = apm_console_blank;
1830#endif
1831 apm_mainloop();
1832#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1833 console_blank_hook = NULL;
1834#endif
1835 }
1da177e4
LT		 1836
1837 return 0;
1838}
1839
1840#ifndef MODULE
1841static int __init apm_setup(char *str)
1842{
1843 int invert;
1844
1845 while ((str != NULL) && (*str != '\0')) {
1846 if (strncmp(str, "off", 3) == 0)
1847 apm_disabled = 1;
1848 if (strncmp(str, "on", 2) == 0)
1849 apm_disabled = 0;
1850 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1851 (strncmp(str, "bounce_interval=", 16) == 0))
1852 bounce_interval = simple_strtol(str + 16, NULL, 0);
1853 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1854 (strncmp(str, "idle_threshold=", 15) == 0))
1855 idle_threshold = simple_strtol(str + 15, NULL, 0);
1856 if ((strncmp(str, "idle-period=", 12) == 0) ||
1857 (strncmp(str, "idle_period=", 12) == 0))
1858 idle_period = simple_strtol(str + 12, NULL, 0);
1859 invert = (strncmp(str, "no-", 3) == 0) ||
1860 (strncmp(str, "no_", 3) == 0);
1861 if (invert)
1862 str += 3;
1863 if (strncmp(str, "debug", 5) == 0)
1864 debug = !invert;
1865 if ((strncmp(str, "power-off", 9) == 0) ||
1866 (strncmp(str, "power_off", 9) == 0))
1867 power_off = !invert;
1868 if (strncmp(str, "smp", 3) == 0)
1869 {
1870 smp = !invert;
1871 idle_threshold = 100;
1872 }
1873 if ((strncmp(str, "allow-ints", 10) == 0) ||
1874 (strncmp(str, "allow_ints", 10) == 0))
1875 apm_info.allow_ints = !invert;
1876 if ((strncmp(str, "broken-psr", 10) == 0) ||
1877 (strncmp(str, "broken_psr", 10) == 0))
1878 apm_info.get_power_status_broken = !invert;
1879 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1880 (strncmp(str, "realmode_power_off", 18) == 0))
1881 apm_info.realmode_power_off = !invert;
1882 str = strchr(str, ',');
1883 if (str != NULL)
1884 str += strspn(str, ", \t");
1885 }
1886 return 1;
1887}
1888
1889__setup("apm=", apm_setup);
1890#endif
1891
1892static struct file_operations apm_bios_fops = {
1893 .owner = THIS_MODULE,
1894 .read = do_read,
1895 .poll = do_poll,
1896 .ioctl = do_ioctl,
1897 .open = do_open,
1898 .release = do_release,
1899};
1900
1901static struct miscdevice apm_device = {
1902 APM_MINOR_DEV,
1903 "apm_bios",
1904 &apm_bios_fops
1905};
1906
1907
1908/* Simple "print if true" callback */
1909static int __init print_if_true(struct dmi_system_id *d)
1910{
1911 printk("%s\n", d->ident);
1912 return 0;
1913}
1914
1915/*
1916 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1917 * disabled before the suspend. Linux used to get terribly confused by that.
1918 */
1919static int __init broken_ps2_resume(struct dmi_system_id *d)
1920{
1921 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug workaround hopefully not needed.\n", d->ident);
1922 return 0;
1923}
1924
1925/* Some bioses have a broken protected mode poweroff and need to use realmode */
1926static int __init set_realmode_power_off(struct dmi_system_id *d)
1927{
1928 if (apm_info.realmode_power_off == 0) {
1929 apm_info.realmode_power_off = 1;
1930 printk(KERN_INFO "%s bios detected. Using realmode poweroff only.\n", d->ident);
1931 }
1932 return 0;
1933}
1934
1935/* Some laptops require interrupts to be enabled during APM calls */
1936static int __init set_apm_ints(struct dmi_system_id *d)
1937{
1938 if (apm_info.allow_ints == 0) {
1939 apm_info.allow_ints = 1;
1940 printk(KERN_INFO "%s machine detected. Enabling interrupts during APM calls.\n", d->ident);
1941 }
1942 return 0;
1943}
1944
1945/* Some APM bioses corrupt memory or just plain do not work */
1946static int __init apm_is_horked(struct dmi_system_id *d)
1947{
1948 if (apm_info.disabled == 0) {
1949 apm_info.disabled = 1;
1950 printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
1951 }
1952 return 0;
1953}
1954
1955static int __init apm_is_horked_d850md(struct dmi_system_id *d)
1956{
1957 if (apm_info.disabled == 0) {
1958 apm_info.disabled = 1;
1959 printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
1960 printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n");
1961 printk(KERN_INFO "download from support.intel.com \n");
1962 }
1963 return 0;
1964}
1965
1966/* Some APM bioses hang on APM idle calls */
1967static int __init apm_likes_to_melt(struct dmi_system_id *d)
1968{
1969 if (apm_info.forbid_idle == 0) {
1970 apm_info.forbid_idle = 1;
1971 printk(KERN_INFO "%s machine detected. Disabling APM idle calls.\n", d->ident);
1972 }
1973 return 0;
1974}
1975
1976/*
1977 * Check for clue free BIOS implementations who use
1978 * the following QA technique
1979 *
1980 * [ Write BIOS Code ]<------
1981 * | ^
1982 * < Does it Compile >----N--
1983 * |Y ^
1984 * < Does it Boot Win98 >-N--
1985 * |Y
1986 * [Ship It]
1987 *
1988 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
1989 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
1990 */
1991static int __init broken_apm_power(struct dmi_system_id *d)
1992{
1993 apm_info.get_power_status_broken = 1;
1994 printk(KERN_WARNING "BIOS strings suggest APM bugs, disabling power status reporting.\n");
1995 return 0;
1996}
1997
1998/*
1999 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2000 * have this problem).
2001 */
2002static int __init swab_apm_power_in_minutes(struct dmi_system_id *d)
2003{
2004 apm_info.get_power_status_swabinminutes = 1;
2005 printk(KERN_WARNING "BIOS strings suggest APM reports battery life in minutes and wrong byte order.\n");
2006 return 0;
2007}
2008
2009static struct dmi_system_id __initdata apm_dmi_table[] = {
2010 {
2011 print_if_true,
2012 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2013 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2014 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2015 },
2016 { /* Handle problems with APM on the C600 */
2017 broken_ps2_resume, "Dell Latitude C600",
2018 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2019 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2020 },
2021 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2022 set_apm_ints, "Dell Latitude",
2023 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2024 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2025 },
2026 { /* APM crashes */
2027 apm_is_horked, "Dell Inspiron 2500",
2028 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2029 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2030 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
2031 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2032 },
2033 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2034 set_apm_ints, "Dell Inspiron", {
2035 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2036 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2037 },
2038 { /* Handle problems with APM on Inspiron 5000e */
2039 broken_apm_power, "Dell Inspiron 5000e",
2040 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2041 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2042 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2043 },
2044 { /* Handle problems with APM on Inspiron 2500 */
2045 broken_apm_power, "Dell Inspiron 2500",
2046 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2047 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2048 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2049 },
2050 { /* APM crashes */
2051 apm_is_horked, "Dell Dimension 4100",
2052 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2053 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2054 DMI_MATCH(DMI_BIOS_VENDOR,"Intel Corp."),
2055 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2056 },
2057 { /* Allow interrupts during suspend on Compaq Laptops*/
2058 set_apm_ints, "Compaq 12XL125",
2059 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2060 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2061 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2062 DMI_MATCH(DMI_BIOS_VERSION,"4.06"), },
2063 },
2064 { /* Allow interrupts during APM or the clock goes slow */
2065 set_apm_ints, "ASUSTeK",
2066 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2067 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2068 },
2069 { /* APM blows on shutdown */
2070 apm_is_horked, "ABIT KX7-333[R]",
2071 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2072 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2073 },
2074 { /* APM crashes */
2075 apm_is_horked, "Trigem Delhi3",
2076 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2077 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2078 },
2079 { /* APM crashes */
2080 apm_is_horked, "Fujitsu-Siemens",
2081 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2082 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2083 },
2084 { /* APM crashes */
2085 apm_is_horked_d850md, "Intel D850MD",
2086 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2087 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2088 },
2089 { /* APM crashes */
2090 apm_is_horked, "Intel D810EMO",
2091 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2092 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2093 },
2094 { /* APM crashes */
2095 apm_is_horked, "Dell XPS-Z",
2096 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2097 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2098 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2099 },
2100 { /* APM crashes */
2101 apm_is_horked, "Sharp PC-PJ/AX",
2102 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2103 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2104 DMI_MATCH(DMI_BIOS_VENDOR,"SystemSoft"),
2105 DMI_MATCH(DMI_BIOS_VERSION,"Version R2.08"), },
2106 },
2107 { /* APM crashes */
2108 apm_is_horked, "Dell Inspiron 2500",
2109 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2110 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2111 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
2112 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2113 },
2114 { /* APM idle hangs */
2115 apm_likes_to_melt, "Jabil AMD",
2116 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2117 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2118 },
2119 { /* APM idle hangs */
2120 apm_likes_to_melt, "AMI Bios",
2121 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2122 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2123 },
2124 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2125 swab_apm_power_in_minutes, "Sony VAIO",
2126 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2127 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2128 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2129 },
2130 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2131 swab_apm_power_in_minutes, "Sony VAIO",
2132 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2133 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2134 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2135 },
2136 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2137 swab_apm_power_in_minutes, "Sony VAIO",
2138 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2139 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2140 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
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, "R0121Z1"),
2146 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2147 },
2148 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2149 swab_apm_power_in_minutes, "Sony VAIO",
2150 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2151 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2152 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2153 },
2154 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2155 swab_apm_power_in_minutes, "Sony VAIO",
2156 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2157 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2158 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
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, "R0203D0"),
2164 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2165 },
2166 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2167 swab_apm_power_in_minutes, "Sony VAIO",
2168 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2169 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2170 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2171 },
2172 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2173 swab_apm_power_in_minutes, "Sony VAIO",
2174 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2175 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2176 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2177 },
2178 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2179 swab_apm_power_in_minutes, "Sony VAIO",
2180 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2181 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2182 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2183 },
2184
2185 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2186 swab_apm_power_in_minutes, "Sony VAIO",
2187 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2188 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2189 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
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, "R0204P1"),
2195 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2196 },
2197 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2198 swab_apm_power_in_minutes, "Sony VAIO",
2199 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2200 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2201 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2202 },
2203 { /* broken PM poweroff bios */
2204 set_realmode_power_off, "Award Software v4.60 PGMA",
2205 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2206 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2207 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2208 },
2209
2210 /* Generic per vendor APM settings */
2211
2212 { /* Allow interrupts during suspend on IBM laptops */
2213 set_apm_ints, "IBM",
2214 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2215 },
2216
2217 { }
2218};
2219
2220/*
2221 * Just start the APM thread. We do NOT want to do APM BIOS
2222 * calls from anything but the APM thread, if for no other reason
2223 * than the fact that we don't trust the APM BIOS. This way,
2224 * most common APM BIOS problems that lead to protection errors
2225 * etc will have at least some level of being contained...
2226 *
2227 * In short, if something bad happens, at least we have a choice
2228 * of just killing the apm thread..
2229 */
2230static int __init apm_init(void)
2231{
2232 struct proc_dir_entry *apm_proc;
92f17f01 2233 struct desc_struct *gdt;
fc09561d 2234 int err;
1da177e4
LT		 2235
2236 dmi_check_system(apm_dmi_table);
2237
2238 if (apm_info.bios.version == 0) {
2239 printk(KERN_INFO "apm: BIOS not found.\n");
2240 return -ENODEV;
2241 }
2242 printk(KERN_INFO
2243 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2244 ((apm_info.bios.version >> 8) & 0xff),
2245 (apm_info.bios.version & 0xff),
2246 apm_info.bios.flags,
2247 driver_version);
2248 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2249 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2250 return -ENODEV;
2251 }
2252
2253 if (allow_ints)
2254 apm_info.allow_ints = 1;
2255 if (broken_psr)
2256 apm_info.get_power_status_broken = 1;
2257 if (realmode_power_off)
2258 apm_info.realmode_power_off = 1;
2259 /* User can override, but default is to trust DMI */
2260 if (apm_disabled != -1)
2261 apm_info.disabled = apm_disabled;
2262
2263 /*
2264 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2265 * but is reportedly a 1.0 BIOS.
2266 */
2267 if (apm_info.bios.version == 0x001)
2268 apm_info.bios.version = 0x100;
2269
2270 /* BIOS < 1.2 doesn't set cseg_16_len */
2271 if (apm_info.bios.version < 0x102)
2272 apm_info.bios.cseg_16_len = 0; /* 64k */
2273
2274 if (debug) {
2275 printk(KERN_INFO "apm: entry %x:%lx cseg16 %x dseg %x",
2276 apm_info.bios.cseg, apm_info.bios.offset,
2277 apm_info.bios.cseg_16, apm_info.bios.dseg);
2278 if (apm_info.bios.version > 0x100)
2279 printk(" cseg len %x, dseg len %x",
2280 apm_info.bios.cseg_len,
2281 apm_info.bios.dseg_len);
2282 if (apm_info.bios.version > 0x101)
2283 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2284 printk("\n");
2285 }
2286
2287 if (apm_info.disabled) {
2288 printk(KERN_NOTICE "apm: disabled on user request.\n");
2289 return -ENODEV;
2290 }
2291 if ((num_online_cpus() > 1) && !power_off && !smp) {
2292 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2293 apm_info.disabled = 1;
2294 return -ENODEV;
2295 }
2296 if (PM_IS_ACTIVE()) {
2297 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2298 apm_info.disabled = 1;
2299 return -ENODEV;
2300 }
987d4613 2301#ifdef CONFIG_PM_LEGACY
1da177e4 2302 pm_active = 1;
987d4613 2303#endif
1da177e4
LT		 2304
2305 /*
2306 * Set up a segment that references the real mode segment 0x40
2307 * that extends up to the end of page zero (that we have reserved).
2308 * This is for buggy BIOS's that refer to (real mode) segment 0x40
2309 * even though they are called in protected mode.
2310 */
2311 set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
2312 _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
2313
3012d2d2
ZA		 2314 /*
2315 * Set up the long jump entry point to the APM BIOS, which is called
2316 * from inline assembly.
2317 */
1da177e4
LT		 2318 apm_bios_entry.offset = apm_info.bios.offset;
2319 apm_bios_entry.segment = APM_CS;
2320
3012d2d2
ZA		 2321 /*
2322 * The APM 1.1 BIOS is supposed to provide limit information that it
2323 * recognizes. Many machines do this correctly, but many others do
2324 * not restrict themselves to their claimed limit. When this happens,
2325 * they will cause a segmentation violation in the kernel at boot time.
2326 * Most BIOS's, however, will respect a 64k limit, so we use that.
92f17f01
ZA		 2327 *
2328 * Note we only set APM segments on CPU zero, since we pin the APM
2329 * code to that CPU.
3012d2d2 2330 */
92f17f01
ZA		 2331 gdt = get_cpu_gdt_table(0);
2332 set_base(gdt[APM_CS >> 3],
2333 __va((unsigned long)apm_info.bios.cseg << 4));
2334 set_base(gdt[APM_CS_16 >> 3],
2335 __va((unsigned long)apm_info.bios.cseg_16 << 4));
2336 set_base(gdt[APM_DS >> 3],
2337 __va((unsigned long)apm_info.bios.dseg << 4));
1da177e4
LT		 2338
2339 apm_proc = create_proc_info_entry("apm", 0, NULL, apm_get_info);
2340 if (apm_proc)
2341 apm_proc->owner = THIS_MODULE;
2342
fc09561d
SH		 2343 kapmd_task = kthread_create(apm, NULL, "kapmd");
2344 if (IS_ERR(kapmd_task)) {
2345 printk(KERN_ERR "apm: disabled - Unable to start kernel "
2346 "thread.\n");
2347 err = PTR_ERR(kapmd_task);
2348 kapmd_task = NULL;
c94a62aa 2349 remove_proc_entry("apm", NULL);
fc09561d 2350 return err;
1da177e4 2351 }
fc09561d
SH		 2352 kapmd_task->flags |= PF_NOFREEZE;
2353 wake_up_process(kapmd_task);
1da177e4
LT		 2354
2355 if (num_online_cpus() > 1 && !smp ) {
2356 printk(KERN_NOTICE
2357 "apm: disabled - APM is not SMP safe (power off active).\n");
2358 return 0;
2359 }
2360
c94a62aa
NH		 2361 /*
2362 * Note we don't actually care if the misc_device cannot be registered.
2363 * this driver can do its job without it, even if userspace can't
2364 * control it. just log the error
2365 */
2366 if (misc_register(&apm_device))
2367 printk(KERN_WARNING "apm: Could not register misc device.\n");
1da177e4
LT		 2368
2369 if (HZ != 100)
2370 idle_period = (idle_period * HZ) / 100;
2371 if (idle_threshold < 100) {
2372 original_pm_idle = pm_idle;
2373 pm_idle = apm_cpu_idle;
2374 set_pm_idle = 1;
2375 }
2376
2377 return 0;
2378}
2379
2380static void __exit apm_exit(void)
2381{
2382 int error;
2383
2384 if (set_pm_idle) {
2385 pm_idle = original_pm_idle;
2386 /*
2387 * We are about to unload the current idle thread pm callback
2388 * (pm_idle), Wait for all processors to update cached/local
2389 * copies of pm_idle before proceeding.
2390 */
2391 cpu_idle_wait();
2392 }
2393 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2394 && (apm_info.connection_version > 0x0100)) {
2395 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2396 if (error)
2397 apm_error("disengage power management", error);
2398 }
2399 misc_deregister(&apm_device);
2400 remove_proc_entry("apm", NULL);
2401 if (power_off)
2402 pm_power_off = NULL;
fc09561d
SH		 2403 if (kapmd_task) {
2404 kthread_stop(kapmd_task);
2405 kapmd_task = NULL;
2406 }
987d4613 2407#ifdef CONFIG_PM_LEGACY
1da177e4 2408 pm_active = 0;
987d4613 2409#endif
1da177e4
LT		 2410}
2411
2412module_init(apm_init);
2413module_exit(apm_exit);
2414
2415MODULE_AUTHOR("Stephen Rothwell");
2416MODULE_DESCRIPTION("Advanced Power Management");
2417MODULE_LICENSE("GPL");
2418module_param(debug, bool, 0644);
2419MODULE_PARM_DESC(debug, "Enable debug mode");
2420module_param(power_off, bool, 0444);
2421MODULE_PARM_DESC(power_off, "Enable power off");
2422module_param(bounce_interval, int, 0444);
2423MODULE_PARM_DESC(bounce_interval,
2424 "Set the number of ticks to ignore suspend bounces");
2425module_param(allow_ints, bool, 0444);
2426MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2427module_param(broken_psr, bool, 0444);
2428MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2429module_param(realmode_power_off, bool, 0444);
2430MODULE_PARM_DESC(realmode_power_off,
2431 "Switch to real mode before powering off");
2432module_param(idle_threshold, int, 0444);
2433MODULE_PARM_DESC(idle_threshold,
2434 "System idle percentage above which to make APM BIOS idle calls");
2435module_param(idle_period, int, 0444);
2436MODULE_PARM_DESC(idle_period,
2437 "Period (in sec/100) over which to caculate the idle percentage");
2438module_param(smp, bool, 0444);
2439MODULE_PARM_DESC(smp,
2440 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2441MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
Linux kernel - Deliverables
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