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[PATCH] x86: add an accessor function for getting the per-CPU gdt
[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:
201 * http://www.microsoft.com/hwdev/busbios/amp_12.htm]
202 */
203
204#include <linux/config.h>
205#include <linux/module.h>
206
207#include <linux/poll.h>
208#include <linux/types.h>
209#include <linux/stddef.h>
210#include <linux/timer.h>
211#include <linux/fcntl.h>
212#include <linux/slab.h>
213#include <linux/stat.h>
214#include <linux/proc_fs.h>
215#include <linux/miscdevice.h>
216#include <linux/apm_bios.h>
217#include <linux/init.h>
218#include <linux/time.h>
219#include <linux/sched.h>
220#include <linux/pm.h>
221#include <linux/device.h>
222#include <linux/kernel.h>
223#include <linux/smp.h>
224#include <linux/smp_lock.h>
225#include <linux/dmi.h>
226#include <linux/suspend.h>
227
228#include <asm/system.h>
229#include <asm/uaccess.h>
230#include <asm/desc.h>
306e440d 231#include <asm/i8253.h>
1da177e4
LT		 232
233#include "io_ports.h"
234
1da177e4
LT		 235extern unsigned long get_cmos_time(void);
236extern void machine_real_restart(unsigned char *, int);
237
238#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
239extern int (*console_blank_hook)(int);
240#endif
241
242/*
243 * The apm_bios device is one of the misc char devices.
244 * This is its minor number.
245 */
246#define APM_MINOR_DEV 134
247
248/*
249 * See Documentation/Config.help for the configuration options.
250 *
251 * Various options can be changed at boot time as follows:
252 * (We allow underscores for compatibility with the modules code)
253 * apm=on/off enable/disable APM
254 * [no-]allow[-_]ints allow interrupts during BIOS calls
255 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
256 * [no-]realmode[-_]power[-_]off switch to real mode before
257 * powering off
258 * [no-]debug log some debugging messages
259 * [no-]power[-_]off power off on shutdown
260 * [no-]smp Use apm even on an SMP box
261 * bounce[-_]interval=<n> number of ticks to ignore suspend
262 * bounces
263 * idle[-_]threshold=<n> System idle percentage above which to
264 * make APM BIOS idle calls. Set it to
265 * 100 to disable.
266 * idle[-_]period=<n> Period (in 1/100s of a second) over
267 * which the idle percentage is
268 * calculated.
269 */
270
271/* KNOWN PROBLEM MACHINES:
272 *
273 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
274 * [Confirmed by TI representative]
275 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
276 * [Confirmed by BIOS disassembly]
277 * [This may work now ...]
278 * P: Toshiba 1950S: battery life information only gets updated after resume
279 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
280 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
281 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
282 * Neale Banks <neale@lowendale.com.au> December 2000
283 *
284 * Legend: U = unusable with APM patches
285 * P = partially usable with APM patches
286 */
287
288/*
289 * Define as 1 to make the driver always call the APM BIOS busy
290 * routine even if the clock was not reported as slowed by the
291 * idle routine. Otherwise, define as 0.
292 */
293#define ALWAYS_CALL_BUSY 1
294
295/*
296 * Define to make the APM BIOS calls zero all data segment registers (so
297 * that an incorrect BIOS implementation will cause a kernel panic if it
298 * tries to write to arbitrary memory).
299 */
300#define APM_ZERO_SEGS
301
302#include "apm.h"
303
304/*
305 * Define to make all _set_limit calls use 64k limits. The APM 1.1 BIOS is
306 * supposed to provide limit information that it recognizes. Many machines
307 * do this correctly, but many others do not restrict themselves to their
308 * claimed limit. When this happens, they will cause a segmentation
309 * violation in the kernel at boot time. Most BIOS's, however, will
310 * respect a 64k limit, so we use that. If you want to be pedantic and
311 * hold your BIOS to its claims, then undefine this.
312 */
313#define APM_RELAX_SEGMENTS
314
315/*
316 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
317 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
318 * David Chen <chen@ctpa04.mit.edu>
319 */
320#undef INIT_TIMER_AFTER_SUSPEND
321
322#ifdef INIT_TIMER_AFTER_SUSPEND
323#include <linux/timex.h>
324#include <asm/io.h>
325#include <linux/delay.h>
326#endif
327
328/*
329 * Need to poll the APM BIOS every second
330 */
331#define APM_CHECK_TIMEOUT (HZ)
332
333/*
334 * Ignore suspend events for this amount of time after a resume
335 */
336#define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
337
338/*
339 * Maximum number of events stored
340 */
341#define APM_MAX_EVENTS 20
342
343/*
344 * The per-file APM data
345 */
346struct apm_user {
347 int magic;
348 struct apm_user * next;
77617bd8
DP		 349 unsigned int suser: 1;
350 unsigned int writer: 1;
351 unsigned int reader: 1;
352 unsigned int suspend_wait: 1;
1da177e4
LT		 353 int suspend_result;
354 int suspends_pending;
355 int standbys_pending;
356 int suspends_read;
357 int standbys_read;
358 int event_head;
359 int event_tail;
360 apm_event_t events[APM_MAX_EVENTS];
361};
362
363/*
364 * The magic number in apm_user
365 */
366#define APM_BIOS_MAGIC 0x4101
367
368/*
369 * idle percentage above which bios idle calls are done
370 */
371#ifdef CONFIG_APM_CPU_IDLE
372#define DEFAULT_IDLE_THRESHOLD 95
373#else
374#define DEFAULT_IDLE_THRESHOLD 100
375#endif
376#define DEFAULT_IDLE_PERIOD (100 / 3)
377
378/*
379 * Local variables
380 */
381static struct {
382 unsigned long offset;
383 unsigned short segment;
384} apm_bios_entry;
385static int clock_slowed;
386static int idle_threshold = DEFAULT_IDLE_THRESHOLD;
387static int idle_period = DEFAULT_IDLE_PERIOD;
388static int set_pm_idle;
389static int suspends_pending;
390static int standbys_pending;
391static int ignore_sys_suspend;
392static int ignore_normal_resume;
393static int bounce_interval = DEFAULT_BOUNCE_INTERVAL;
394
395#ifdef CONFIG_APM_RTC_IS_GMT
396# define clock_cmos_diff 0
397# define got_clock_diff 1
398#else
399static long clock_cmos_diff;
400static int got_clock_diff;
401#endif
402static int debug;
403static int smp;
404static int apm_disabled = -1;
405#ifdef CONFIG_SMP
406static int power_off;
407#else
408static int power_off = 1;
409#endif
410#ifdef CONFIG_APM_REAL_MODE_POWER_OFF
411static int realmode_power_off = 1;
412#else
413static int realmode_power_off;
414#endif
415static int exit_kapmd;
416static int kapmd_running;
417#ifdef CONFIG_APM_ALLOW_INTS
418static int allow_ints = 1;
419#else
420static int allow_ints;
421#endif
422static int broken_psr;
423
424static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
425static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
426static struct apm_user * user_list;
427static DEFINE_SPINLOCK(user_list_lock);
428static struct desc_struct bad_bios_desc = { 0, 0x00409200 };
429
430static char driver_version[] = "1.16ac"; /* no spaces */
431
432/*
433 * APM event names taken from the APM 1.2 specification. These are
434 * the message codes that the BIOS uses to tell us about events
435 */
436static char * apm_event_name[] = {
437 "system standby",
438 "system suspend",
439 "normal resume",
440 "critical resume",
441 "low battery",
442 "power status change",
443 "update time",
444 "critical suspend",
445 "user standby",
446 "user suspend",
447 "system standby resume",
448 "capabilities change"
449};
450#define NR_APM_EVENT_NAME \
451 (sizeof(apm_event_name) / sizeof(apm_event_name[0]))
452
453typedef struct lookup_t {
454 int key;
455 char * msg;
456} lookup_t;
457
458/*
459 * The BIOS returns a set of standard error codes in AX when the
460 * carry flag is set.
461 */
462
463static const lookup_t error_table[] = {
464/* N/A { APM_SUCCESS, "Operation succeeded" }, */
465 { APM_DISABLED, "Power management disabled" },
466 { APM_CONNECTED, "Real mode interface already connected" },
467 { APM_NOT_CONNECTED, "Interface not connected" },
468 { APM_16_CONNECTED, "16 bit interface already connected" },
469/* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
470 { APM_32_CONNECTED, "32 bit interface already connected" },
471 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
472 { APM_BAD_DEVICE, "Unrecognized device ID" },
473 { APM_BAD_PARAM, "Parameter out of range" },
474 { APM_NOT_ENGAGED, "Interface not engaged" },
475 { APM_BAD_FUNCTION, "Function not supported" },
476 { APM_RESUME_DISABLED, "Resume timer disabled" },
477 { APM_BAD_STATE, "Unable to enter requested state" },
478/* N/A { APM_NO_EVENTS, "No events pending" }, */
479 { APM_NO_ERROR, "BIOS did not set a return code" },
480 { APM_NOT_PRESENT, "No APM present" }
481};
482#define ERROR_COUNT (sizeof(error_table)/sizeof(lookup_t))
483
484/**
485 * apm_error - display an APM error
486 * @str: information string
487 * @err: APM BIOS return code
488 *
489 * Write a meaningful log entry to the kernel log in the event of
490 * an APM error.
491 */
492
493static void apm_error(char *str, int err)
494{
495 int i;
496
497 for (i = 0; i < ERROR_COUNT; i++)
498 if (error_table[i].key == err) break;
499 if (i < ERROR_COUNT)
500 printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
501 else
502 printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
503 str, err);
504}
505
506/*
507 * Lock APM functionality to physical CPU 0
508 */
509
510#ifdef CONFIG_SMP
511
512static cpumask_t apm_save_cpus(void)
513{
514 cpumask_t x = current->cpus_allowed;
515 /* Some bioses don't like being called from CPU != 0 */
516 set_cpus_allowed(current, cpumask_of_cpu(0));
517 BUG_ON(smp_processor_id() != 0);
518 return x;
519}
520
521static inline void apm_restore_cpus(cpumask_t mask)
522{
523 set_cpus_allowed(current, mask);
524}
525
526#else
527
528/*
529 * No CPU lockdown needed on a uniprocessor
530 */
531
532#define apm_save_cpus() (current->cpus_allowed)
533#define apm_restore_cpus(x) (void)(x)
534
535#endif
536
537/*
538 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
539 * apm_info.allow_ints, we are being really paranoid here! Not only
540 * are interrupts disabled, but all the segment registers (except SS)
541 * are saved and zeroed this means that if the BIOS tries to reference
542 * any data without explicitly loading the segment registers, the kernel
543 * will fault immediately rather than have some unforeseen circumstances
544 * for the rest of the kernel. And it will be very obvious! :-) Doing
545 * this depends on CS referring to the same physical memory as DS so that
546 * DS can be zeroed before the call. Unfortunately, we can't do anything
547 * about the stack segment/pointer. Also, we tell the compiler that
548 * everything could change.
549 *
550 * Also, we KNOW that for the non error case of apm_bios_call, there
551 * is no useful data returned in the low order 8 bits of eax.
552 */
553#define APM_DO_CLI \
554 if (apm_info.allow_ints) \
555 local_irq_enable(); \
556 else \
557 local_irq_disable();
558
559#ifdef APM_ZERO_SEGS
560# define APM_DECL_SEGS \
561 unsigned int saved_fs; unsigned int saved_gs;
562# define APM_DO_SAVE_SEGS \
563 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
564# define APM_DO_RESTORE_SEGS \
565 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
566#else
567# define APM_DECL_SEGS
568# define APM_DO_SAVE_SEGS
569# define APM_DO_RESTORE_SEGS
570#endif
571
572/**
573 * apm_bios_call - Make an APM BIOS 32bit call
574 * @func: APM function to execute
575 * @ebx_in: EBX register for call entry
576 * @ecx_in: ECX register for call entry
577 * @eax: EAX register return
578 * @ebx: EBX register return
579 * @ecx: ECX register return
580 * @edx: EDX register return
581 * @esi: ESI register return
582 *
583 * Make an APM call using the 32bit protected mode interface. The
584 * caller is responsible for knowing if APM BIOS is configured and
585 * enabled. This call can disable interrupts for a long period of
586 * time on some laptops. The return value is in AH and the carry
587 * flag is loaded into AL. If there is an error, then the error
588 * code is returned in AH (bits 8-15 of eax) and this function
589 * returns non-zero.
590 */
591
592static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in,
593 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi)
594{
595 APM_DECL_SEGS
596 unsigned long flags;
597 cpumask_t cpus;
598 int cpu;
599 struct desc_struct save_desc_40;
251e6912 600 struct desc_struct *gdt;
1da177e4
LT		 601
602 cpus = apm_save_cpus();
603
604 cpu = get_cpu();
251e6912
ZA		 605 gdt = get_cpu_gdt_table(cpu);
606 save_desc_40 = gdt[0x40 / 8];
607 gdt[0x40 / 8] = bad_bios_desc;
1da177e4
LT		 608
609 local_save_flags(flags);
610 APM_DO_CLI;
611 APM_DO_SAVE_SEGS;
612 apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi);
613 APM_DO_RESTORE_SEGS;
614 local_irq_restore(flags);
251e6912 615 gdt[0x40 / 8] = save_desc_40;
1da177e4
LT		 616 put_cpu();
617 apm_restore_cpus(cpus);
618
619 return *eax & 0xff;
620}
621
622/**
623 * apm_bios_call_simple - make a simple APM BIOS 32bit call
624 * @func: APM function to invoke
625 * @ebx_in: EBX register value for BIOS call
626 * @ecx_in: ECX register value for BIOS call
627 * @eax: EAX register on return from the BIOS call
628 *
629 * Make a BIOS call that does only returns one value, or just status.
630 * If there is an error, then the error code is returned in AH
631 * (bits 8-15 of eax) and this function returns non-zero. This is
632 * used for simpler BIOS operations. This call may hold interrupts
633 * off for a long time on some laptops.
634 */
635
636static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax)
637{
638 u8 error;
639 APM_DECL_SEGS
640 unsigned long flags;
641 cpumask_t cpus;
642 int cpu;
643 struct desc_struct save_desc_40;
251e6912 644 struct desc_struct *gdt;
1da177e4
LT		 645
646 cpus = apm_save_cpus();
647
648 cpu = get_cpu();
251e6912
ZA		 649 gdt = get_cpu_gdt_table(cpu);
650 save_desc_40 = gdt[0x40 / 8];
651 gdt[0x40 / 8] = bad_bios_desc;
1da177e4
LT		 652
653 local_save_flags(flags);
654 APM_DO_CLI;
655 APM_DO_SAVE_SEGS;
656 error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax);
657 APM_DO_RESTORE_SEGS;
658 local_irq_restore(flags);
251e6912 659 gdt[0x40 / 8] = save_desc_40;
1da177e4
LT		 660 put_cpu();
661 apm_restore_cpus(cpus);
662 return error;
663}
664
665/**
666 * apm_driver_version - APM driver version
667 * @val: loaded with the APM version on return
668 *
669 * Retrieve the APM version supported by the BIOS. This is only
670 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
671 * probably present.
672 *
673 * On entry val should point to a value indicating the APM driver
674 * version with the high byte being the major and the low byte the
675 * minor number both in BCD
676 *
677 * On return it will hold the BIOS revision supported in the
678 * same format.
679 */
680
681static int apm_driver_version(u_short *val)
682{
683 u32 eax;
684
685 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax))
686 return (eax >> 8) & 0xff;
687 *val = eax;
688 return APM_SUCCESS;
689}
690
691/**
692 * apm_get_event - get an APM event from the BIOS
693 * @event: pointer to the event
694 * @info: point to the event information
695 *
696 * The APM BIOS provides a polled information for event
697 * reporting. The BIOS expects to be polled at least every second
698 * when events are pending. When a message is found the caller should
699 * poll until no more messages are present. However, this causes
700 * problems on some laptops where a suspend event notification is
701 * not cleared until it is acknowledged.
702 *
703 * Additional information is returned in the info pointer, providing
704 * that APM 1.2 is in use. If no messges are pending the value 0x80
705 * is returned (No power management events pending).
706 */
707
708static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
709{
710 u32 eax;
711 u32 ebx;
712 u32 ecx;
713 u32 dummy;
714
715 if (apm_bios_call(APM_FUNC_GET_EVENT, 0, 0, &eax, &ebx, &ecx,
716 &dummy, &dummy))
717 return (eax >> 8) & 0xff;
718 *event = ebx;
719 if (apm_info.connection_version < 0x0102)
720 *info = ~0; /* indicate info not valid */
721 else
722 *info = ecx;
723 return APM_SUCCESS;
724}
725
726/**
727 * set_power_state - set the power management state
728 * @what: which items to transition
729 * @state: state to transition to
730 *
731 * Request an APM change of state for one or more system devices. The
732 * processor state must be transitioned last of all. what holds the
733 * class of device in the upper byte and the device number (0xFF for
734 * all) for the object to be transitioned.
735 *
736 * The state holds the state to transition to, which may in fact
737 * be an acceptance of a BIOS requested state change.
738 */
739
740static int set_power_state(u_short what, u_short state)
741{
742 u32 eax;
743
744 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax))
745 return (eax >> 8) & 0xff;
746 return APM_SUCCESS;
747}
748
749/**
750 * set_system_power_state - set system wide power state
751 * @state: which state to enter
752 *
753 * Transition the entire system into a new APM power state.
754 */
755
756static int set_system_power_state(u_short state)
757{
758 return set_power_state(APM_DEVICE_ALL, state);
759}
760
761/**
762 * apm_do_idle - perform power saving
763 *
764 * This function notifies the BIOS that the processor is (in the view
765 * of the OS) idle. It returns -1 in the event that the BIOS refuses
766 * to handle the idle request. On a success the function returns 1
767 * if the BIOS did clock slowing or 0 otherwise.
768 */
769
770static int apm_do_idle(void)
771{
772 u32 eax;
773
774 if (apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax)) {
775 static unsigned long t;
776
777 /* This always fails on some SMP boards running UP kernels.
778 * Only report the failure the first 5 times.
779 */
780 if (++t < 5)
781 {
782 printk(KERN_DEBUG "apm_do_idle failed (%d)\n",
783 (eax >> 8) & 0xff);
784 t = jiffies;
785 }
786 return -1;
787 }
788 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
789 return clock_slowed;
790}
791
792/**
793 * apm_do_busy - inform the BIOS the CPU is busy
794 *
795 * Request that the BIOS brings the CPU back to full performance.
796 */
797
798static void apm_do_busy(void)
799{
800 u32 dummy;
801
802 if (clock_slowed || ALWAYS_CALL_BUSY) {
803 (void) apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy);
804 clock_slowed = 0;
805 }
806}
807
808/*
809 * If no process has really been interested in
810 * the CPU for some time, we want to call BIOS
811 * power management - we probably want
812 * to conserve power.
813 */
814#define IDLE_CALC_LIMIT (HZ * 100)
815#define IDLE_LEAKY_MAX 16
816
817static void (*original_pm_idle)(void);
818
819extern void default_idle(void);
820
821/**
822 * apm_cpu_idle - cpu idling for APM capable Linux
823 *
824 * This is the idling function the kernel executes when APM is available. It
825 * tries to do BIOS powermanagement based on the average system idle time.
826 * Furthermore it calls the system default idle routine.
827 */
828
829static void apm_cpu_idle(void)
830{
831 static int use_apm_idle; /* = 0 */
832 static unsigned int last_jiffies; /* = 0 */
833 static unsigned int last_stime; /* = 0 */
834
835 int apm_idle_done = 0;
836 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
837 unsigned int bucket;
838
839recalc:
840 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
841 use_apm_idle = 0;
842 last_jiffies = jiffies;
843 last_stime = current->stime;
844 } else if (jiffies_since_last_check > idle_period) {
845 unsigned int idle_percentage;
846
847 idle_percentage = current->stime - last_stime;
848 idle_percentage *= 100;
849 idle_percentage /= jiffies_since_last_check;
850 use_apm_idle = (idle_percentage > idle_threshold);
851 if (apm_info.forbid_idle)
852 use_apm_idle = 0;
853 last_jiffies = jiffies;
854 last_stime = current->stime;
855 }
856
857 bucket = IDLE_LEAKY_MAX;
858
859 while (!need_resched()) {
860 if (use_apm_idle) {
861 unsigned int t;
862
863 t = jiffies;
864 switch (apm_do_idle()) {
865 case 0: apm_idle_done = 1;
866 if (t != jiffies) {
867 if (bucket) {
868 bucket = IDLE_LEAKY_MAX;
869 continue;
870 }
871 } else if (bucket) {
872 bucket--;
873 continue;
874 }
875 break;
876 case 1: apm_idle_done = 1;
877 break;
878 default: /* BIOS refused */
879 break;
880 }
881 }
882 if (original_pm_idle)
883 original_pm_idle();
884 else
885 default_idle();
886 jiffies_since_last_check = jiffies - last_jiffies;
887 if (jiffies_since_last_check > idle_period)
888 goto recalc;
889 }
890
891 if (apm_idle_done)
892 apm_do_busy();
893}
894
895/**
896 * apm_power_off - ask the BIOS to power off
897 *
898 * Handle the power off sequence. This is the one piece of code we
899 * will execute even on SMP machines. In order to deal with BIOS
900 * bugs we support real mode APM BIOS power off calls. We also make
901 * the SMP call on CPU0 as some systems will only honour this call
902 * on their first cpu.
903 */
904
905static void apm_power_off(void)
906{
907 unsigned char po_bios_call[] = {
908 0xb8, 0x00, 0x10, /* movw $0x1000,ax */
909 0x8e, 0xd0, /* movw ax,ss */
910 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
911 0xb8, 0x07, 0x53, /* movw $0x5307,ax */
912 0xbb, 0x01, 0x00, /* movw $0x0001,bx */
913 0xb9, 0x03, 0x00, /* movw $0x0003,cx */
914 0xcd, 0x15 /* int $0x15 */
915 };
916
1da177e4 917 /* Some bioses don't like being called from CPU != 0 */
1da177e4
LT		 918 if (apm_info.realmode_power_off)
919 {
920 (void)apm_save_cpus();
921 machine_real_restart(po_bios_call, sizeof(po_bios_call));
922 }
923 else
924 (void) set_system_power_state(APM_STATE_OFF);
925}
926
927#ifdef CONFIG_APM_DO_ENABLE
928
929/**
930 * apm_enable_power_management - enable BIOS APM power management
931 * @enable: enable yes/no
932 *
933 * Enable or disable the APM BIOS power services.
934 */
935
936static int apm_enable_power_management(int enable)
937{
938 u32 eax;
939
940 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
941 return APM_NOT_ENGAGED;
942 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
943 enable, &eax))
944 return (eax >> 8) & 0xff;
945 if (enable)
946 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
947 else
948 apm_info.bios.flags |= APM_BIOS_DISABLED;
949 return APM_SUCCESS;
950}
951#endif
952
953/**
954 * apm_get_power_status - get current power state
955 * @status: returned status
956 * @bat: battery info
957 * @life: estimated life
958 *
959 * Obtain the current power status from the APM BIOS. We return a
960 * status which gives the rough battery status, and current power
961 * source. The bat value returned give an estimate as a percentage
962 * of life and a status value for the battery. The estimated life
963 * if reported is a lifetime in secodnds/minutes at current powwer
964 * consumption.
965 */
966
967static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
968{
969 u32 eax;
970 u32 ebx;
971 u32 ecx;
972 u32 edx;
973 u32 dummy;
974
975 if (apm_info.get_power_status_broken)
976 return APM_32_UNSUPPORTED;
977 if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0,
978 &eax, &ebx, &ecx, &edx, &dummy))
979 return (eax >> 8) & 0xff;
980 *status = ebx;
981 *bat = ecx;
982 if (apm_info.get_power_status_swabinminutes) {
983 *life = swab16((u16)edx);
984 *life |= 0x8000;
985 } else
986 *life = edx;
987 return APM_SUCCESS;
988}
989
990#if 0
991static int apm_get_battery_status(u_short which, u_short *status,
992 u_short *bat, u_short *life, u_short *nbat)
993{
994 u32 eax;
995 u32 ebx;
996 u32 ecx;
997 u32 edx;
998 u32 esi;
999
1000 if (apm_info.connection_version < 0x0102) {
1001 /* pretend we only have one battery. */
1002 if (which != 1)
1003 return APM_BAD_DEVICE;
1004 *nbat = 1;
1005 return apm_get_power_status(status, bat, life);
1006 }
1007
1008 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1009 &ebx, &ecx, &edx, &esi))
1010 return (eax >> 8) & 0xff;
1011 *status = ebx;
1012 *bat = ecx;
1013 *life = edx;
1014 *nbat = esi;
1015 return APM_SUCCESS;
1016}
1017#endif
1018
1019/**
1020 * apm_engage_power_management - enable PM on a device
1021 * @device: identity of device
1022 * @enable: on/off
1023 *
1024 * Activate or deactive power management on either a specific device
1025 * or the entire system (%APM_DEVICE_ALL).
1026 */
1027
1028static int apm_engage_power_management(u_short device, int enable)
1029{
1030 u32 eax;
1031
1032 if ((enable == 0) && (device == APM_DEVICE_ALL)
1033 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1034 return APM_DISABLED;
1035 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax))
1036 return (eax >> 8) & 0xff;
1037 if (device == APM_DEVICE_ALL) {
1038 if (enable)
1039 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1040 else
1041 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1042 }
1043 return APM_SUCCESS;
1044}
1045
1046#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1047
1048/**
1049 * apm_console_blank - blank the display
1050 * @blank: on/off
1051 *
1052 * Attempt to blank the console, firstly by blanking just video device
1053 * zero, and if that fails (some BIOSes don't support it) then it blanks
1054 * all video devices. Typically the BIOS will do laptop backlight and
1055 * monitor powerdown for us.
1056 */
1057
1058static int apm_console_blank(int blank)
1059{
1060 int error;
1061 u_short state;
1062
1063 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1064 /* Blank the first display device */
1065 error = set_power_state(0x100, state);
1066 if ((error != APM_SUCCESS) && (error != APM_NO_ERROR)) {
1067 /* try to blank them all instead */
1068 error = set_power_state(0x1ff, state);
1069 if ((error != APM_SUCCESS) && (error != APM_NO_ERROR))
1070 /* try to blank device one instead */
1071 error = set_power_state(0x101, state);
1072 }
1073 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1074 return 1;
1075 if (error == APM_NOT_ENGAGED) {
1076 static int tried;
1077 int eng_error;
1078 if (tried++ == 0) {
1079 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1080 if (eng_error) {
1081 apm_error("set display", error);
1082 apm_error("engage interface", eng_error);
1083 return 0;
1084 } else
1085 return apm_console_blank(blank);
1086 }
1087 }
1088 apm_error("set display", error);
1089 return 0;
1090}
1091#endif
1092
1093static int queue_empty(struct apm_user *as)
1094{
1095 return as->event_head == as->event_tail;
1096}
1097
1098static apm_event_t get_queued_event(struct apm_user *as)
1099{
1100 as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
1101 return as->events[as->event_tail];
1102}
1103
1104static void queue_event(apm_event_t event, struct apm_user *sender)
1105{
1106 struct apm_user * as;
1107
1108 spin_lock(&user_list_lock);
1109 if (user_list == NULL)
1110 goto out;
1111 for (as = user_list; as != NULL; as = as->next) {
1112 if ((as == sender) || (!as->reader))
1113 continue;
1114 as->event_head = (as->event_head + 1) % APM_MAX_EVENTS;
1115 if (as->event_head == as->event_tail) {
1116 static int notified;
1117
1118 if (notified++ == 0)
1119 printk(KERN_ERR "apm: an event queue overflowed\n");
1120 as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
1121 }
1122 as->events[as->event_head] = event;
1123 if ((!as->suser) || (!as->writer))
1124 continue;
1125 switch (event) {
1126 case APM_SYS_SUSPEND:
1127 case APM_USER_SUSPEND:
1128 as->suspends_pending++;
1129 suspends_pending++;
1130 break;
1131
1132 case APM_SYS_STANDBY:
1133 case APM_USER_STANDBY:
1134 as->standbys_pending++;
1135 standbys_pending++;
1136 break;
1137 }
1138 }
1139 wake_up_interruptible(&apm_waitqueue);
1140out:
1141 spin_unlock(&user_list_lock);
1142}
1143
1144static void set_time(void)
1145{
1146 if (got_clock_diff) { /* Must know time zone in order to set clock */
1147 xtime.tv_sec = get_cmos_time() + clock_cmos_diff;
1148 xtime.tv_nsec = 0;
1149 }
1150}
1151
1152static void get_time_diff(void)
1153{
1154#ifndef CONFIG_APM_RTC_IS_GMT
1155 /*
1156 * Estimate time zone so that set_time can update the clock
1157 */
1158 clock_cmos_diff = -get_cmos_time();
1159 clock_cmos_diff += get_seconds();
1160 got_clock_diff = 1;
1161#endif
1162}
1163
1164static void reinit_timer(void)
1165{
1166#ifdef INIT_TIMER_AFTER_SUSPEND
306e440d 1167 unsigned long flags;
1da177e4
LT		 1168
1169 spin_lock_irqsave(&i8253_lock, flags);
1170 /* set the clock to 100 Hz */
1171 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1172 udelay(10);
1173 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1174 udelay(10);
1175 outb(LATCH >> 8, PIT_CH0); /* MSB */
1176 udelay(10);
1177 spin_unlock_irqrestore(&i8253_lock, flags);
1178#endif
1179}
1180
1181static int suspend(int vetoable)
1182{
1183 int err;
1184 struct apm_user *as;
1185
1186 if (pm_send_all(PM_SUSPEND, (void *)3)) {
1187 /* Vetoed */
1188 if (vetoable) {
1189 if (apm_info.connection_version > 0x100)
1190 set_system_power_state(APM_STATE_REJECT);
1191 err = -EBUSY;
1192 ignore_sys_suspend = 0;
1193 printk(KERN_WARNING "apm: suspend was vetoed.\n");
1194 goto out;
1195 }
1196 printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
1197 }
1198
1199 device_suspend(PMSG_SUSPEND);
1200 local_irq_disable();
1201 device_power_down(PMSG_SUSPEND);
1202
1203 /* serialize with the timer interrupt */
1204 write_seqlock(&xtime_lock);
1205
1206 /* protect against access to timer chip registers */
1207 spin_lock(&i8253_lock);
1208
1209 get_time_diff();
1210 /*
1211 * Irq spinlock must be dropped around set_system_power_state.
1212 * We'll undo any timer changes due to interrupts below.
1213 */
1214 spin_unlock(&i8253_lock);
1215 write_sequnlock(&xtime_lock);
1216 local_irq_enable();
1217
1218 save_processor_state();
1219 err = set_system_power_state(APM_STATE_SUSPEND);
92c6dc59 1220 ignore_normal_resume = 1;
1da177e4
LT		 1221 restore_processor_state();
1222
1223 local_irq_disable();
1224 write_seqlock(&xtime_lock);
1225 spin_lock(&i8253_lock);
1226 reinit_timer();
1227 set_time();
1da177e4
LT		 1228
1229 spin_unlock(&i8253_lock);
1230 write_sequnlock(&xtime_lock);
1231
1232 if (err == APM_NO_ERROR)
1233 err = APM_SUCCESS;
1234 if (err != APM_SUCCESS)
1235 apm_error("suspend", err);
1236 err = (err == APM_SUCCESS) ? 0 : -EIO;
1237 device_power_up();
1238 local_irq_enable();
1239 device_resume();
1240 pm_send_all(PM_RESUME, (void *)0);
1241 queue_event(APM_NORMAL_RESUME, NULL);
1242 out:
1243 spin_lock(&user_list_lock);
1244 for (as = user_list; as != NULL; as = as->next) {
1245 as->suspend_wait = 0;
1246 as->suspend_result = err;
1247 }
1248 spin_unlock(&user_list_lock);
1249 wake_up_interruptible(&apm_suspend_waitqueue);
1250 return err;
1251}
1252
1253static void standby(void)
1254{
1255 int err;
1256
1257 local_irq_disable();
1258 device_power_down(PMSG_SUSPEND);
1259 /* serialize with the timer interrupt */
1260 write_seqlock(&xtime_lock);
1261 /* If needed, notify drivers here */
1262 get_time_diff();
1263 write_sequnlock(&xtime_lock);
1264 local_irq_enable();
1265
1266 err = set_system_power_state(APM_STATE_STANDBY);
1267 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1268 apm_error("standby", err);
1269
1270 local_irq_disable();
1271 device_power_up();
1272 local_irq_enable();
1273}
1274
1275static apm_event_t get_event(void)
1276{
1277 int error;
1278 apm_event_t event;
1279 apm_eventinfo_t info;
1280
1281 static int notified;
1282
1283 /* we don't use the eventinfo */
1284 error = apm_get_event(&event, &info);
1285 if (error == APM_SUCCESS)
1286 return event;
1287
1288 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1289 apm_error("get_event", error);
1290
1291 return 0;
1292}
1293
1294static void check_events(void)
1295{
1296 apm_event_t event;
1297 static unsigned long last_resume;
1298 static int ignore_bounce;
1299
1300 while ((event = get_event()) != 0) {
1301 if (debug) {
1302 if (event <= NR_APM_EVENT_NAME)
1303 printk(KERN_DEBUG "apm: received %s notify\n",
1304 apm_event_name[event - 1]);
1305 else
1306 printk(KERN_DEBUG "apm: received unknown "
1307 "event 0x%02x\n", event);
1308 }
1309 if (ignore_bounce
1310 && ((jiffies - last_resume) > bounce_interval))
1311 ignore_bounce = 0;
1312
1313 switch (event) {
1314 case APM_SYS_STANDBY:
1315 case APM_USER_STANDBY:
1316 queue_event(event, NULL);
1317 if (standbys_pending <= 0)
1318 standby();
1319 break;
1320
1321 case APM_USER_SUSPEND:
1322#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1323 if (apm_info.connection_version > 0x100)
1324 set_system_power_state(APM_STATE_REJECT);
1325 break;
1326#endif
1327 case APM_SYS_SUSPEND:
1328 if (ignore_bounce) {
1329 if (apm_info.connection_version > 0x100)
1330 set_system_power_state(APM_STATE_REJECT);
1331 break;
1332 }
1333 /*
1334 * If we are already processing a SUSPEND,
1335 * then further SUSPEND events from the BIOS
1336 * will be ignored. We also return here to
1337 * cope with the fact that the Thinkpads keep
1338 * sending a SUSPEND event until something else
1339 * happens!
1340 */
1341 if (ignore_sys_suspend)
1342 return;
1343 ignore_sys_suspend = 1;
1344 queue_event(event, NULL);
1345 if (suspends_pending <= 0)
1346 (void) suspend(1);
1347 break;
1348
1349 case APM_NORMAL_RESUME:
1350 case APM_CRITICAL_RESUME:
1351 case APM_STANDBY_RESUME:
1352 ignore_sys_suspend = 0;
1353 last_resume = jiffies;
1354 ignore_bounce = 1;
1355 if ((event != APM_NORMAL_RESUME)
1356 || (ignore_normal_resume == 0)) {
1357 write_seqlock_irq(&xtime_lock);
1358 set_time();
1359 write_sequnlock_irq(&xtime_lock);
1360 device_resume();
1361 pm_send_all(PM_RESUME, (void *)0);
1362 queue_event(event, NULL);
1363 }
1364 ignore_normal_resume = 0;
1365 break;
1366
1367 case APM_CAPABILITY_CHANGE:
1368 case APM_LOW_BATTERY:
1369 case APM_POWER_STATUS_CHANGE:
1370 queue_event(event, NULL);
1371 /* If needed, notify drivers here */
1372 break;
1373
1374 case APM_UPDATE_TIME:
1375 write_seqlock_irq(&xtime_lock);
1376 set_time();
1377 write_sequnlock_irq(&xtime_lock);
1378 break;
1379
1380 case APM_CRITICAL_SUSPEND:
1381 /*
1382 * We are not allowed to reject a critical suspend.
1383 */
1384 (void) suspend(0);
1385 break;
1386 }
1387 }
1388}
1389
1390static void apm_event_handler(void)
1391{
1392 static int pending_count = 4;
1393 int err;
1394
1395 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1396 if ((apm_info.connection_version > 0x100) &&
1397 (pending_count-- <= 0)) {
1398 pending_count = 4;
1399 if (debug)
1400 printk(KERN_DEBUG "apm: setting state busy\n");
1401 err = set_system_power_state(APM_STATE_BUSY);
1402 if (err)
1403 apm_error("busy", err);
1404 }
1405 } else
1406 pending_count = 4;
1407 check_events();
1408}
1409
1410/*
1411 * This is the APM thread main loop.
1412 */
1413
1414static void apm_mainloop(void)
1415{
1416 DECLARE_WAITQUEUE(wait, current);
1417
1418 add_wait_queue(&apm_waitqueue, &wait);
1419 set_current_state(TASK_INTERRUPTIBLE);
1420 for (;;) {
1421 schedule_timeout(APM_CHECK_TIMEOUT);
1422 if (exit_kapmd)
1423 break;
1424 /*
1425 * Ok, check all events, check for idle (and mark us sleeping
1426 * so as not to count towards the load average)..
1427 */
1428 set_current_state(TASK_INTERRUPTIBLE);
1429 apm_event_handler();
1430 }
1431 remove_wait_queue(&apm_waitqueue, &wait);
1432}
1433
1434static int check_apm_user(struct apm_user *as, const char *func)
1435{
1436 if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) {
1437 printk(KERN_ERR "apm: %s passed bad filp\n", func);
1438 return 1;
1439 }
1440 return 0;
1441}
1442
1443static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1444{
1445 struct apm_user * as;
1446 int i;
1447 apm_event_t event;
1448
1449 as = fp->private_data;
1450 if (check_apm_user(as, "read"))
1451 return -EIO;
1452 if ((int)count < sizeof(apm_event_t))
1453 return -EINVAL;
1454 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1455 return -EAGAIN;
1456 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1457 i = count;
1458 while ((i >= sizeof(event)) && !queue_empty(as)) {
1459 event = get_queued_event(as);
1460 if (copy_to_user(buf, &event, sizeof(event))) {
1461 if (i < count)
1462 break;
1463 return -EFAULT;
1464 }
1465 switch (event) {
1466 case APM_SYS_SUSPEND:
1467 case APM_USER_SUSPEND:
1468 as->suspends_read++;
1469 break;
1470
1471 case APM_SYS_STANDBY:
1472 case APM_USER_STANDBY:
1473 as->standbys_read++;
1474 break;
1475 }
1476 buf += sizeof(event);
1477 i -= sizeof(event);
1478 }
1479 if (i < count)
1480 return count - i;
1481 if (signal_pending(current))
1482 return -ERESTARTSYS;
1483 return 0;
1484}
1485
1486static unsigned int do_poll(struct file *fp, poll_table * wait)
1487{
1488 struct apm_user * as;
1489
1490 as = fp->private_data;
1491 if (check_apm_user(as, "poll"))
1492 return 0;
1493 poll_wait(fp, &apm_waitqueue, wait);
1494 if (!queue_empty(as))
1495 return POLLIN | POLLRDNORM;
1496 return 0;
1497}
1498
1499static int do_ioctl(struct inode * inode, struct file *filp,
1500 u_int cmd, u_long arg)
1501{
1502 struct apm_user * as;
1503
1504 as = filp->private_data;
1505 if (check_apm_user(as, "ioctl"))
1506 return -EIO;
1507 if ((!as->suser) || (!as->writer))
1508 return -EPERM;
1509 switch (cmd) {
1510 case APM_IOC_STANDBY:
1511 if (as->standbys_read > 0) {
1512 as->standbys_read--;
1513 as->standbys_pending--;
1514 standbys_pending--;
1515 } else
1516 queue_event(APM_USER_STANDBY, as);
1517 if (standbys_pending <= 0)
1518 standby();
1519 break;
1520 case APM_IOC_SUSPEND:
1521 if (as->suspends_read > 0) {
1522 as->suspends_read--;
1523 as->suspends_pending--;
1524 suspends_pending--;
1525 } else
1526 queue_event(APM_USER_SUSPEND, as);
1527 if (suspends_pending <= 0) {
1528 return suspend(1);
1529 } else {
1530 as->suspend_wait = 1;
1531 wait_event_interruptible(apm_suspend_waitqueue,
1532 as->suspend_wait == 0);
1533 return as->suspend_result;
1534 }
1535 break;
1536 default:
1537 return -EINVAL;
1538 }
1539 return 0;
1540}
1541
1542static int do_release(struct inode * inode, struct file * filp)
1543{
1544 struct apm_user * as;
1545
1546 as = filp->private_data;
1547 if (check_apm_user(as, "release"))
1548 return 0;
1549 filp->private_data = NULL;
1550 if (as->standbys_pending > 0) {
1551 standbys_pending -= as->standbys_pending;
1552 if (standbys_pending <= 0)
1553 standby();
1554 }
1555 if (as->suspends_pending > 0) {
1556 suspends_pending -= as->suspends_pending;
1557 if (suspends_pending <= 0)
1558 (void) suspend(1);
1559 }
1560 spin_lock(&user_list_lock);
1561 if (user_list == as)
1562 user_list = as->next;
1563 else {
1564 struct apm_user * as1;
1565
1566 for (as1 = user_list;
1567 (as1 != NULL) && (as1->next != as);
1568 as1 = as1->next)
1569 ;
1570 if (as1 == NULL)
1571 printk(KERN_ERR "apm: filp not in user list\n");
1572 else
1573 as1->next = as->next;
1574 }
1575 spin_unlock(&user_list_lock);
1576 kfree(as);
1577 return 0;
1578}
1579
1580static int do_open(struct inode * inode, struct file * filp)
1581{
1582 struct apm_user * as;
1583
1584 as = (struct apm_user *)kmalloc(sizeof(*as), GFP_KERNEL);
1585 if (as == NULL) {
1586 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1587 sizeof(*as));
1588 return -ENOMEM;
1589 }
1590 as->magic = APM_BIOS_MAGIC;
1591 as->event_tail = as->event_head = 0;
1592 as->suspends_pending = as->standbys_pending = 0;
1593 as->suspends_read = as->standbys_read = 0;
1594 /*
1595 * XXX - this is a tiny bit broken, when we consider BSD
1596 * process accounting. If the device is opened by root, we
1597 * instantly flag that we used superuser privs. Who knows,
1598 * we might close the device immediately without doing a
1599 * privileged operation -- cevans
1600 */
1601 as->suser = capable(CAP_SYS_ADMIN);
1602 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1603 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1604 spin_lock(&user_list_lock);
1605 as->next = user_list;
1606 user_list = as;
1607 spin_unlock(&user_list_lock);
1608 filp->private_data = as;
1609 return 0;
1610}
1611
1612static int apm_get_info(char *buf, char **start, off_t fpos, int length)
1613{
1614 char * p;
1615 unsigned short bx;
1616 unsigned short cx;
1617 unsigned short dx;
1618 int error;
1619 unsigned short ac_line_status = 0xff;
1620 unsigned short battery_status = 0xff;
1621 unsigned short battery_flag = 0xff;
1622 int percentage = -1;
1623 int time_units = -1;
1624 char *units = "?";
1625
1626 p = buf;
1627
1628 if ((num_online_cpus() == 1) &&
1629 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1630 ac_line_status = (bx >> 8) & 0xff;
1631 battery_status = bx & 0xff;
1632 if ((cx & 0xff) != 0xff)
1633 percentage = cx & 0xff;
1634
1635 if (apm_info.connection_version > 0x100) {
1636 battery_flag = (cx >> 8) & 0xff;
1637 if (dx != 0xffff) {
1638 units = (dx & 0x8000) ? "min" : "sec";
1639 time_units = dx & 0x7fff;
1640 }
1641 }
1642 }
1643 /* Arguments, with symbols from linux/apm_bios.h. Information is
1644 from the Get Power Status (0x0a) call unless otherwise noted.
1645
1646 0) Linux driver version (this will change if format changes)
1647 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1648 2) APM flags from APM Installation Check (0x00):
1649 bit 0: APM_16_BIT_SUPPORT
1650 bit 1: APM_32_BIT_SUPPORT
1651 bit 2: APM_IDLE_SLOWS_CLOCK
1652 bit 3: APM_BIOS_DISABLED
1653 bit 4: APM_BIOS_DISENGAGED
1654 3) AC line status
1655 0x00: Off-line
1656 0x01: On-line
1657 0x02: On backup power (BIOS >= 1.1 only)
1658 0xff: Unknown
1659 4) Battery status
1660 0x00: High
1661 0x01: Low
1662 0x02: Critical
1663 0x03: Charging
1664 0x04: Selected battery not present (BIOS >= 1.2 only)
1665 0xff: Unknown
1666 5) Battery flag
1667 bit 0: High
1668 bit 1: Low
1669 bit 2: Critical
1670 bit 3: Charging
1671 bit 7: No system battery
1672 0xff: Unknown
1673 6) Remaining battery life (percentage of charge):
1674 0-100: valid
1675 -1: Unknown
1676 7) Remaining battery life (time units):
1677 Number of remaining minutes or seconds
1678 -1: Unknown
1679 8) min = minutes; sec = seconds */
1680
1681 p += sprintf(p, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1682 driver_version,
1683 (apm_info.bios.version >> 8) & 0xff,
1684 apm_info.bios.version & 0xff,
1685 apm_info.bios.flags,
1686 ac_line_status,
1687 battery_status,
1688 battery_flag,
1689 percentage,
1690 time_units,
1691 units);
1692
1693 return p - buf;
1694}
1695
1696static int apm(void *unused)
1697{
1698 unsigned short bx;
1699 unsigned short cx;
1700 unsigned short dx;
1701 int error;
1702 char * power_stat;
1703 char * bat_stat;
1704
1705 kapmd_running = 1;
1706
1707 daemonize("kapmd");
1708
1709 current->flags |= PF_NOFREEZE;
1710
1711#ifdef CONFIG_SMP
1712 /* 2002/08/01 - WT
1713 * This is to avoid random crashes at boot time during initialization
1714 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1715 * Some bioses don't like being called from CPU != 0.
1716 * Method suggested by Ingo Molnar.
1717 */
1718 set_cpus_allowed(current, cpumask_of_cpu(0));
1719 BUG_ON(smp_processor_id() != 0);
1720#endif
1721
1722 if (apm_info.connection_version == 0) {
1723 apm_info.connection_version = apm_info.bios.version;
1724 if (apm_info.connection_version > 0x100) {
1725 /*
1726 * We only support BIOSs up to version 1.2
1727 */
1728 if (apm_info.connection_version > 0x0102)
1729 apm_info.connection_version = 0x0102;
1730 error = apm_driver_version(&apm_info.connection_version);
1731 if (error != APM_SUCCESS) {
1732 apm_error("driver version", error);
1733 /* Fall back to an APM 1.0 connection. */
1734 apm_info.connection_version = 0x100;
1735 }
1736 }
1737 }
1738
1739 if (debug)
1740 printk(KERN_INFO "apm: Connection version %d.%d\n",
1741 (apm_info.connection_version >> 8) & 0xff,
1742 apm_info.connection_version & 0xff);
1743
1744#ifdef CONFIG_APM_DO_ENABLE
1745 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1746 /*
1747 * This call causes my NEC UltraLite Versa 33/C to hang if it
1748 * is booted with PM disabled but not in the docking station.
1749 * Unfortunate ...
1750 */
1751 error = apm_enable_power_management(1);
1752 if (error) {
1753 apm_error("enable power management", error);
1754 return -1;
1755 }
1756 }
1757#endif
1758
1759 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1760 && (apm_info.connection_version > 0x0100)) {
1761 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1762 if (error) {
1763 apm_error("engage power management", error);
1764 return -1;
1765 }
1766 }
1767
1768 if (debug && (num_online_cpus() == 1 || smp )) {
1769 error = apm_get_power_status(&bx, &cx, &dx);
1770 if (error)
1771 printk(KERN_INFO "apm: power status not available\n");
1772 else {
1773 switch ((bx >> 8) & 0xff) {
1774 case 0: power_stat = "off line"; break;
1775 case 1: power_stat = "on line"; break;
1776 case 2: power_stat = "on backup power"; break;
1777 default: power_stat = "unknown"; break;
1778 }
1779 switch (bx & 0xff) {
1780 case 0: bat_stat = "high"; break;
1781 case 1: bat_stat = "low"; break;
1782 case 2: bat_stat = "critical"; break;
1783 case 3: bat_stat = "charging"; break;
1784 default: bat_stat = "unknown"; break;
1785 }
1786 printk(KERN_INFO
1787 "apm: AC %s, battery status %s, battery life ",
1788 power_stat, bat_stat);
1789 if ((cx & 0xff) == 0xff)
1790 printk("unknown\n");
1791 else
1792 printk("%d%%\n", cx & 0xff);
1793 if (apm_info.connection_version > 0x100) {
1794 printk(KERN_INFO
1795 "apm: battery flag 0x%02x, battery life ",
1796 (cx >> 8) & 0xff);
1797 if (dx == 0xffff)
1798 printk("unknown\n");
1799 else
1800 printk("%d %s\n", dx & 0x7fff,
1801 (dx & 0x8000) ?
1802 "minutes" : "seconds");
1803 }
1804 }
1805 }
1806
1807 /* Install our power off handler.. */
1808 if (power_off)
1809 pm_power_off = apm_power_off;
1810
1811 if (num_online_cpus() == 1 || smp) {
1812#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1813 console_blank_hook = apm_console_blank;
1814#endif
1815 apm_mainloop();
1816#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1817 console_blank_hook = NULL;
1818#endif
1819 }
1820 kapmd_running = 0;
1821
1822 return 0;
1823}
1824
1825#ifndef MODULE
1826static int __init apm_setup(char *str)
1827{
1828 int invert;
1829
1830 while ((str != NULL) && (*str != '\0')) {
1831 if (strncmp(str, "off", 3) == 0)
1832 apm_disabled = 1;
1833 if (strncmp(str, "on", 2) == 0)
1834 apm_disabled = 0;
1835 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1836 (strncmp(str, "bounce_interval=", 16) == 0))
1837 bounce_interval = simple_strtol(str + 16, NULL, 0);
1838 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1839 (strncmp(str, "idle_threshold=", 15) == 0))
1840 idle_threshold = simple_strtol(str + 15, NULL, 0);
1841 if ((strncmp(str, "idle-period=", 12) == 0) ||
1842 (strncmp(str, "idle_period=", 12) == 0))
1843 idle_period = simple_strtol(str + 12, NULL, 0);
1844 invert = (strncmp(str, "no-", 3) == 0) ||
1845 (strncmp(str, "no_", 3) == 0);
1846 if (invert)
1847 str += 3;
1848 if (strncmp(str, "debug", 5) == 0)
1849 debug = !invert;
1850 if ((strncmp(str, "power-off", 9) == 0) ||
1851 (strncmp(str, "power_off", 9) == 0))
1852 power_off = !invert;
1853 if (strncmp(str, "smp", 3) == 0)
1854 {
1855 smp = !invert;
1856 idle_threshold = 100;
1857 }
1858 if ((strncmp(str, "allow-ints", 10) == 0) ||
1859 (strncmp(str, "allow_ints", 10) == 0))
1860 apm_info.allow_ints = !invert;
1861 if ((strncmp(str, "broken-psr", 10) == 0) ||
1862 (strncmp(str, "broken_psr", 10) == 0))
1863 apm_info.get_power_status_broken = !invert;
1864 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1865 (strncmp(str, "realmode_power_off", 18) == 0))
1866 apm_info.realmode_power_off = !invert;
1867 str = strchr(str, ',');
1868 if (str != NULL)
1869 str += strspn(str, ", \t");
1870 }
1871 return 1;
1872}
1873
1874__setup("apm=", apm_setup);
1875#endif
1876
1877static struct file_operations apm_bios_fops = {
1878 .owner = THIS_MODULE,
1879 .read = do_read,
1880 .poll = do_poll,
1881 .ioctl = do_ioctl,
1882 .open = do_open,
1883 .release = do_release,
1884};
1885
1886static struct miscdevice apm_device = {
1887 APM_MINOR_DEV,
1888 "apm_bios",
1889 &apm_bios_fops
1890};
1891
1892
1893/* Simple "print if true" callback */
1894static int __init print_if_true(struct dmi_system_id *d)
1895{
1896 printk("%s\n", d->ident);
1897 return 0;
1898}
1899
1900/*
1901 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1902 * disabled before the suspend. Linux used to get terribly confused by that.
1903 */
1904static int __init broken_ps2_resume(struct dmi_system_id *d)
1905{
1906 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug workaround hopefully not needed.\n", d->ident);
1907 return 0;
1908}
1909
1910/* Some bioses have a broken protected mode poweroff and need to use realmode */
1911static int __init set_realmode_power_off(struct dmi_system_id *d)
1912{
1913 if (apm_info.realmode_power_off == 0) {
1914 apm_info.realmode_power_off = 1;
1915 printk(KERN_INFO "%s bios detected. Using realmode poweroff only.\n", d->ident);
1916 }
1917 return 0;
1918}
1919
1920/* Some laptops require interrupts to be enabled during APM calls */
1921static int __init set_apm_ints(struct dmi_system_id *d)
1922{
1923 if (apm_info.allow_ints == 0) {
1924 apm_info.allow_ints = 1;
1925 printk(KERN_INFO "%s machine detected. Enabling interrupts during APM calls.\n", d->ident);
1926 }
1927 return 0;
1928}
1929
1930/* Some APM bioses corrupt memory or just plain do not work */
1931static int __init apm_is_horked(struct dmi_system_id *d)
1932{
1933 if (apm_info.disabled == 0) {
1934 apm_info.disabled = 1;
1935 printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
1936 }
1937 return 0;
1938}
1939
1940static int __init apm_is_horked_d850md(struct dmi_system_id *d)
1941{
1942 if (apm_info.disabled == 0) {
1943 apm_info.disabled = 1;
1944 printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
1945 printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n");
1946 printk(KERN_INFO "download from support.intel.com \n");
1947 }
1948 return 0;
1949}
1950
1951/* Some APM bioses hang on APM idle calls */
1952static int __init apm_likes_to_melt(struct dmi_system_id *d)
1953{
1954 if (apm_info.forbid_idle == 0) {
1955 apm_info.forbid_idle = 1;
1956 printk(KERN_INFO "%s machine detected. Disabling APM idle calls.\n", d->ident);
1957 }
1958 return 0;
1959}
1960
1961/*
1962 * Check for clue free BIOS implementations who use
1963 * the following QA technique
1964 *
1965 * [ Write BIOS Code ]<------
1966 * | ^
1967 * < Does it Compile >----N--
1968 * |Y ^
1969 * < Does it Boot Win98 >-N--
1970 * |Y
1971 * [Ship It]
1972 *
1973 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
1974 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
1975 */
1976static int __init broken_apm_power(struct dmi_system_id *d)
1977{
1978 apm_info.get_power_status_broken = 1;
1979 printk(KERN_WARNING "BIOS strings suggest APM bugs, disabling power status reporting.\n");
1980 return 0;
1981}
1982
1983/*
1984 * This bios swaps the APM minute reporting bytes over (Many sony laptops
1985 * have this problem).
1986 */
1987static int __init swab_apm_power_in_minutes(struct dmi_system_id *d)
1988{
1989 apm_info.get_power_status_swabinminutes = 1;
1990 printk(KERN_WARNING "BIOS strings suggest APM reports battery life in minutes and wrong byte order.\n");
1991 return 0;
1992}
1993
1994static struct dmi_system_id __initdata apm_dmi_table[] = {
1995 {
1996 print_if_true,
1997 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
1998 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
1999 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2000 },
2001 { /* Handle problems with APM on the C600 */
2002 broken_ps2_resume, "Dell Latitude C600",
2003 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2004 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2005 },
2006 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2007 set_apm_ints, "Dell Latitude",
2008 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2009 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2010 },
2011 { /* APM crashes */
2012 apm_is_horked, "Dell Inspiron 2500",
2013 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2014 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2015 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
2016 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2017 },
2018 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2019 set_apm_ints, "Dell Inspiron", {
2020 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2021 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2022 },
2023 { /* Handle problems with APM on Inspiron 5000e */
2024 broken_apm_power, "Dell Inspiron 5000e",
2025 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2026 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2027 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2028 },
2029 { /* Handle problems with APM on Inspiron 2500 */
2030 broken_apm_power, "Dell Inspiron 2500",
2031 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2032 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2033 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2034 },
2035 { /* APM crashes */
2036 apm_is_horked, "Dell Dimension 4100",
2037 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2038 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2039 DMI_MATCH(DMI_BIOS_VENDOR,"Intel Corp."),
2040 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2041 },
2042 { /* Allow interrupts during suspend on Compaq Laptops*/
2043 set_apm_ints, "Compaq 12XL125",
2044 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2045 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2046 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2047 DMI_MATCH(DMI_BIOS_VERSION,"4.06"), },
2048 },
2049 { /* Allow interrupts during APM or the clock goes slow */
2050 set_apm_ints, "ASUSTeK",
2051 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2052 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2053 },
2054 { /* APM blows on shutdown */
2055 apm_is_horked, "ABIT KX7-333[R]",
2056 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2057 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2058 },
2059 { /* APM crashes */
2060 apm_is_horked, "Trigem Delhi3",
2061 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2062 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2063 },
2064 { /* APM crashes */
2065 apm_is_horked, "Fujitsu-Siemens",
2066 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2067 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2068 },
2069 { /* APM crashes */
2070 apm_is_horked_d850md, "Intel D850MD",
2071 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2072 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2073 },
2074 { /* APM crashes */
2075 apm_is_horked, "Intel D810EMO",
2076 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2077 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2078 },
2079 { /* APM crashes */
2080 apm_is_horked, "Dell XPS-Z",
2081 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2082 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2083 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2084 },
2085 { /* APM crashes */
2086 apm_is_horked, "Sharp PC-PJ/AX",
2087 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2088 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2089 DMI_MATCH(DMI_BIOS_VENDOR,"SystemSoft"),
2090 DMI_MATCH(DMI_BIOS_VERSION,"Version R2.08"), },
2091 },
2092 { /* APM crashes */
2093 apm_is_horked, "Dell Inspiron 2500",
2094 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2095 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2096 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
2097 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2098 },
2099 { /* APM idle hangs */
2100 apm_likes_to_melt, "Jabil AMD",
2101 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2102 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2103 },
2104 { /* APM idle hangs */
2105 apm_likes_to_melt, "AMI Bios",
2106 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2107 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2108 },
2109 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2110 swab_apm_power_in_minutes, "Sony VAIO",
2111 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2112 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2113 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2114 },
2115 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2116 swab_apm_power_in_minutes, "Sony VAIO",
2117 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2118 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2119 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2120 },
2121 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2122 swab_apm_power_in_minutes, "Sony VAIO",
2123 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2124 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2125 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2126 },
2127 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2128 swab_apm_power_in_minutes, "Sony VAIO",
2129 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2130 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2131 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2132 },
2133 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2134 swab_apm_power_in_minutes, "Sony VAIO",
2135 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2136 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2137 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2138 },
2139 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2140 swab_apm_power_in_minutes, "Sony VAIO",
2141 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2142 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2143 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2144 },
2145 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2146 swab_apm_power_in_minutes, "Sony VAIO",
2147 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2148 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2149 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2150 },
2151 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2152 swab_apm_power_in_minutes, "Sony VAIO",
2153 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2154 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2155 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2156 },
2157 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2158 swab_apm_power_in_minutes, "Sony VAIO",
2159 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2160 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2161 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2162 },
2163 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2164 swab_apm_power_in_minutes, "Sony VAIO",
2165 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2166 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2167 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2168 },
2169
2170 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2171 swab_apm_power_in_minutes, "Sony VAIO",
2172 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2173 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2174 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2175 },
2176 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2177 swab_apm_power_in_minutes, "Sony VAIO",
2178 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2179 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2180 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2181 },
2182 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2183 swab_apm_power_in_minutes, "Sony VAIO",
2184 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2185 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2186 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2187 },
2188 { /* broken PM poweroff bios */
2189 set_realmode_power_off, "Award Software v4.60 PGMA",
2190 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2191 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2192 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2193 },
2194
2195 /* Generic per vendor APM settings */
2196
2197 { /* Allow interrupts during suspend on IBM laptops */
2198 set_apm_ints, "IBM",
2199 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2200 },
2201
2202 { }
2203};
2204
2205/*
2206 * Just start the APM thread. We do NOT want to do APM BIOS
2207 * calls from anything but the APM thread, if for no other reason
2208 * than the fact that we don't trust the APM BIOS. This way,
2209 * most common APM BIOS problems that lead to protection errors
2210 * etc will have at least some level of being contained...
2211 *
2212 * In short, if something bad happens, at least we have a choice
2213 * of just killing the apm thread..
2214 */
2215static int __init apm_init(void)
2216{
2217 struct proc_dir_entry *apm_proc;
2218 int ret;
2219 int i;
2220
2221 dmi_check_system(apm_dmi_table);
2222
2223 if (apm_info.bios.version == 0) {
2224 printk(KERN_INFO "apm: BIOS not found.\n");
2225 return -ENODEV;
2226 }
2227 printk(KERN_INFO
2228 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2229 ((apm_info.bios.version >> 8) & 0xff),
2230 (apm_info.bios.version & 0xff),
2231 apm_info.bios.flags,
2232 driver_version);
2233 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2234 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2235 return -ENODEV;
2236 }
2237
2238 if (allow_ints)
2239 apm_info.allow_ints = 1;
2240 if (broken_psr)
2241 apm_info.get_power_status_broken = 1;
2242 if (realmode_power_off)
2243 apm_info.realmode_power_off = 1;
2244 /* User can override, but default is to trust DMI */
2245 if (apm_disabled != -1)
2246 apm_info.disabled = apm_disabled;
2247
2248 /*
2249 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2250 * but is reportedly a 1.0 BIOS.
2251 */
2252 if (apm_info.bios.version == 0x001)
2253 apm_info.bios.version = 0x100;
2254
2255 /* BIOS < 1.2 doesn't set cseg_16_len */
2256 if (apm_info.bios.version < 0x102)
2257 apm_info.bios.cseg_16_len = 0; /* 64k */
2258
2259 if (debug) {
2260 printk(KERN_INFO "apm: entry %x:%lx cseg16 %x dseg %x",
2261 apm_info.bios.cseg, apm_info.bios.offset,
2262 apm_info.bios.cseg_16, apm_info.bios.dseg);
2263 if (apm_info.bios.version > 0x100)
2264 printk(" cseg len %x, dseg len %x",
2265 apm_info.bios.cseg_len,
2266 apm_info.bios.dseg_len);
2267 if (apm_info.bios.version > 0x101)
2268 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2269 printk("\n");
2270 }
2271
2272 if (apm_info.disabled) {
2273 printk(KERN_NOTICE "apm: disabled on user request.\n");
2274 return -ENODEV;
2275 }
2276 if ((num_online_cpus() > 1) && !power_off && !smp) {
2277 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2278 apm_info.disabled = 1;
2279 return -ENODEV;
2280 }
2281 if (PM_IS_ACTIVE()) {
2282 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2283 apm_info.disabled = 1;
2284 return -ENODEV;
2285 }
2286 pm_active = 1;
2287
2288 /*
2289 * Set up a segment that references the real mode segment 0x40
2290 * that extends up to the end of page zero (that we have reserved).
2291 * This is for buggy BIOS's that refer to (real mode) segment 0x40
2292 * even though they are called in protected mode.
2293 */
2294 set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
2295 _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
2296
2297 apm_bios_entry.offset = apm_info.bios.offset;
2298 apm_bios_entry.segment = APM_CS;
2299
2300 for (i = 0; i < NR_CPUS; i++) {
251e6912
ZA		 2301 struct desc_struct *gdt = get_cpu_gdt_table(i);
2302 set_base(gdt[APM_CS >> 3],
1da177e4 2303 __va((unsigned long)apm_info.bios.cseg << 4));
251e6912 2304 set_base(gdt[APM_CS_16 >> 3],
1da177e4 2305 __va((unsigned long)apm_info.bios.cseg_16 << 4));
251e6912 2306 set_base(gdt[APM_DS >> 3],
1da177e4
LT		 2307 __va((unsigned long)apm_info.bios.dseg << 4));
2308#ifndef APM_RELAX_SEGMENTS
2309 if (apm_info.bios.version == 0x100) {
2310#endif
2311 /* For ASUS motherboard, Award BIOS rev 110 (and others?) */
251e6912 2312 _set_limit((char *)&gdt[APM_CS >> 3], 64 * 1024 - 1);
1da177e4 2313 /* For some unknown machine. */
251e6912 2314 _set_limit((char *)&gdt[APM_CS_16 >> 3], 64 * 1024 - 1);
1da177e4 2315 /* For the DEC Hinote Ultra CT475 (and others?) */
251e6912 2316 _set_limit((char *)&gdt[APM_DS >> 3], 64 * 1024 - 1);
1da177e4
LT		 2317#ifndef APM_RELAX_SEGMENTS
2318 } else {
251e6912 2319 _set_limit((char *)&gdt[APM_CS >> 3],
1da177e4 2320 (apm_info.bios.cseg_len - 1) & 0xffff);
251e6912 2321 _set_limit((char *)&gdt[APM_CS_16 >> 3],
1da177e4 2322 (apm_info.bios.cseg_16_len - 1) & 0xffff);
251e6912 2323 _set_limit((char *)&gdt[APM_DS >> 3],
1da177e4
LT		 2324 (apm_info.bios.dseg_len - 1) & 0xffff);
2325 /* workaround for broken BIOSes */
2326 if (apm_info.bios.cseg_len <= apm_info.bios.offset)
251e6912 2327 _set_limit((char *)&gdt[APM_CS >> 3], 64 * 1024 -1);
1da177e4
LT		 2328 if (apm_info.bios.dseg_len <= 0x40) { /* 0x40 * 4kB == 64kB */
2329 /* for the BIOS that assumes granularity = 1 */
251e6912 2330 gdt[APM_DS >> 3].b |= 0x800000;
1da177e4
LT		 2331 printk(KERN_NOTICE "apm: we set the granularity of dseg.\n");
2332 }
2333 }
2334#endif
2335 }
2336
2337 apm_proc = create_proc_info_entry("apm", 0, NULL, apm_get_info);
2338 if (apm_proc)
2339 apm_proc->owner = THIS_MODULE;
2340
2341 ret = kernel_thread(apm, NULL, CLONE_KERNEL | SIGCHLD);
2342 if (ret < 0) {
2343 printk(KERN_ERR "apm: disabled - Unable to start kernel thread.\n");
2344 return -ENOMEM;
2345 }
2346
2347 if (num_online_cpus() > 1 && !smp ) {
2348 printk(KERN_NOTICE
2349 "apm: disabled - APM is not SMP safe (power off active).\n");
2350 return 0;
2351 }
2352
2353 misc_register(&apm_device);
2354
2355 if (HZ != 100)
2356 idle_period = (idle_period * HZ) / 100;
2357 if (idle_threshold < 100) {
2358 original_pm_idle = pm_idle;
2359 pm_idle = apm_cpu_idle;
2360 set_pm_idle = 1;
2361 }
2362
2363 return 0;
2364}
2365
2366static void __exit apm_exit(void)
2367{
2368 int error;
2369
2370 if (set_pm_idle) {
2371 pm_idle = original_pm_idle;
2372 /*
2373 * We are about to unload the current idle thread pm callback
2374 * (pm_idle), Wait for all processors to update cached/local
2375 * copies of pm_idle before proceeding.
2376 */
2377 cpu_idle_wait();
2378 }
2379 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2380 && (apm_info.connection_version > 0x0100)) {
2381 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2382 if (error)
2383 apm_error("disengage power management", error);
2384 }
2385 misc_deregister(&apm_device);
2386 remove_proc_entry("apm", NULL);
2387 if (power_off)
2388 pm_power_off = NULL;
2389 exit_kapmd = 1;
2390 while (kapmd_running)
2391 schedule();
2392 pm_active = 0;
2393}
2394
2395module_init(apm_init);
2396module_exit(apm_exit);
2397
2398MODULE_AUTHOR("Stephen Rothwell");
2399MODULE_DESCRIPTION("Advanced Power Management");
2400MODULE_LICENSE("GPL");
2401module_param(debug, bool, 0644);
2402MODULE_PARM_DESC(debug, "Enable debug mode");
2403module_param(power_off, bool, 0444);
2404MODULE_PARM_DESC(power_off, "Enable power off");
2405module_param(bounce_interval, int, 0444);
2406MODULE_PARM_DESC(bounce_interval,
2407 "Set the number of ticks to ignore suspend bounces");
2408module_param(allow_ints, bool, 0444);
2409MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2410module_param(broken_psr, bool, 0444);
2411MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2412module_param(realmode_power_off, bool, 0444);
2413MODULE_PARM_DESC(realmode_power_off,
2414 "Switch to real mode before powering off");
2415module_param(idle_threshold, int, 0444);
2416MODULE_PARM_DESC(idle_threshold,
2417 "System idle percentage above which to make APM BIOS idle calls");
2418module_param(idle_period, int, 0444);
2419MODULE_PARM_DESC(idle_period,
2420 "Period (in sec/100) over which to caculate the idle percentage");
2421module_param(smp, bool, 0444);
2422MODULE_PARM_DESC(smp,
2423 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2424MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
Linux 6.x block layer and io_uring tree(s)