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