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[PATCH] x86: Pnp segments in segment h
[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>
bca73e4b 221#include <linux/pm_legacy.h>
1da177e4
LT		 222#include <linux/device.h>
223#include <linux/kernel.h>
224#include <linux/smp.h>
225#include <linux/smp_lock.h>
226#include <linux/dmi.h>
227#include <linux/suspend.h>
228
229#include <asm/system.h>
230#include <asm/uaccess.h>
231#include <asm/desc.h>
306e440d 232#include <asm/i8253.h>
1da177e4
LT		 233
234#include "io_ports.h"
235
1da177e4
LT		 236extern unsigned long get_cmos_time(void);
237extern void machine_real_restart(unsigned char *, int);
238
239#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
240extern int (*console_blank_hook)(int);
241#endif
242
243/*
244 * The apm_bios device is one of the misc char devices.
245 * This is its minor number.
246 */
247#define APM_MINOR_DEV 134
248
249/*
250 * See Documentation/Config.help for the configuration options.
251 *
252 * Various options can be changed at boot time as follows:
253 * (We allow underscores for compatibility with the modules code)
254 * apm=on/off enable/disable APM
255 * [no-]allow[-_]ints allow interrupts during BIOS calls
256 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
257 * [no-]realmode[-_]power[-_]off switch to real mode before
258 * powering off
259 * [no-]debug log some debugging messages
260 * [no-]power[-_]off power off on shutdown
261 * [no-]smp Use apm even on an SMP box
262 * bounce[-_]interval=<n> number of ticks to ignore suspend
263 * bounces
264 * idle[-_]threshold=<n> System idle percentage above which to
265 * make APM BIOS idle calls. Set it to
266 * 100 to disable.
267 * idle[-_]period=<n> Period (in 1/100s of a second) over
268 * which the idle percentage is
269 * calculated.
270 */
271
272/* KNOWN PROBLEM MACHINES:
273 *
274 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
275 * [Confirmed by TI representative]
276 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
277 * [Confirmed by BIOS disassembly]
278 * [This may work now ...]
279 * P: Toshiba 1950S: battery life information only gets updated after resume
280 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
281 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
282 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
283 * Neale Banks <neale@lowendale.com.au> December 2000
284 *
285 * Legend: U = unusable with APM patches
286 * P = partially usable with APM patches
287 */
288
289/*
290 * Define as 1 to make the driver always call the APM BIOS busy
291 * routine even if the clock was not reported as slowed by the
292 * idle routine. Otherwise, define as 0.
293 */
294#define ALWAYS_CALL_BUSY 1
295
296/*
297 * Define to make the APM BIOS calls zero all data segment registers (so
298 * that an incorrect BIOS implementation will cause a kernel panic if it
299 * tries to write to arbitrary memory).
300 */
301#define APM_ZERO_SEGS
302
303#include "apm.h"
304
305/*
306 * Define to make all _set_limit calls use 64k limits. The APM 1.1 BIOS is
307 * supposed to provide limit information that it recognizes. Many machines
308 * do this correctly, but many others do not restrict themselves to their
309 * claimed limit. When this happens, they will cause a segmentation
310 * violation in the kernel at boot time. Most BIOS's, however, will
311 * respect a 64k limit, so we use that. If you want to be pedantic and
312 * hold your BIOS to its claims, then undefine this.
313 */
314#define APM_RELAX_SEGMENTS
315
316/*
317 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
318 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
319 * David Chen <chen@ctpa04.mit.edu>
320 */
321#undef INIT_TIMER_AFTER_SUSPEND
322
323#ifdef INIT_TIMER_AFTER_SUSPEND
324#include <linux/timex.h>
325#include <asm/io.h>
326#include <linux/delay.h>
327#endif
328
329/*
330 * Need to poll the APM BIOS every second
331 */
332#define APM_CHECK_TIMEOUT (HZ)
333
334/*
335 * Ignore suspend events for this amount of time after a resume
336 */
337#define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
338
339/*
340 * Maximum number of events stored
341 */
342#define APM_MAX_EVENTS 20
343
344/*
345 * The per-file APM data
346 */
347struct apm_user {
348 int magic;
349 struct apm_user * next;
77617bd8
DP		 350 unsigned int suser: 1;
351 unsigned int writer: 1;
352 unsigned int reader: 1;
353 unsigned int suspend_wait: 1;
1da177e4
LT		 354 int suspend_result;
355 int suspends_pending;
356 int standbys_pending;
357 int suspends_read;
358 int standbys_read;
359 int event_head;
360 int event_tail;
361 apm_event_t events[APM_MAX_EVENTS];
362};
363
364/*
365 * The magic number in apm_user
366 */
367#define APM_BIOS_MAGIC 0x4101
368
369/*
370 * idle percentage above which bios idle calls are done
371 */
372#ifdef CONFIG_APM_CPU_IDLE
373#define DEFAULT_IDLE_THRESHOLD 95
374#else
375#define DEFAULT_IDLE_THRESHOLD 100
376#endif
377#define DEFAULT_IDLE_PERIOD (100 / 3)
378
379/*
380 * Local variables
381 */
382static struct {
383 unsigned long offset;
384 unsigned short segment;
385} apm_bios_entry;
386static int clock_slowed;
387static int idle_threshold = DEFAULT_IDLE_THRESHOLD;
388static int idle_period = DEFAULT_IDLE_PERIOD;
389static int set_pm_idle;
390static int suspends_pending;
391static int standbys_pending;
392static int ignore_sys_suspend;
393static int ignore_normal_resume;
394static int bounce_interval = DEFAULT_BOUNCE_INTERVAL;
395
396#ifdef CONFIG_APM_RTC_IS_GMT
397# define clock_cmos_diff 0
398# define got_clock_diff 1
399#else
400static long clock_cmos_diff;
401static int got_clock_diff;
402#endif
403static int debug;
404static int smp;
405static int apm_disabled = -1;
406#ifdef CONFIG_SMP
407static int power_off;
408#else
409static int power_off = 1;
410#endif
411#ifdef CONFIG_APM_REAL_MODE_POWER_OFF
412static int realmode_power_off = 1;
413#else
414static int realmode_power_off;
415#endif
416static int exit_kapmd;
417static int kapmd_running;
418#ifdef CONFIG_APM_ALLOW_INTS
419static int allow_ints = 1;
420#else
421static int allow_ints;
422#endif
423static int broken_psr;
424
425static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
426static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
427static struct apm_user * user_list;
428static DEFINE_SPINLOCK(user_list_lock);
429static struct desc_struct bad_bios_desc = { 0, 0x00409200 };
430
431static char driver_version[] = "1.16ac"; /* no spaces */
432
433/*
434 * APM event names taken from the APM 1.2 specification. These are
435 * the message codes that the BIOS uses to tell us about events
436 */
437static char * apm_event_name[] = {
438 "system standby",
439 "system suspend",
440 "normal resume",
441 "critical resume",
442 "low battery",
443 "power status change",
444 "update time",
445 "critical suspend",
446 "user standby",
447 "user suspend",
448 "system standby resume",
449 "capabilities change"
450};
38e548ee 451#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
1da177e4
LT		 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};
38e548ee 482#define ERROR_COUNT ARRAY_SIZE(error_table)
1da177e4
LT		 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;
64c7c8f8
NP		 773 u8 ret = 0;
774 int idled = 0;
775 int polling;
776
777 polling = test_thread_flag(TIF_POLLING_NRFLAG);
778 if (polling) {
779 clear_thread_flag(TIF_POLLING_NRFLAG);
780 smp_mb__after_clear_bit();
781 }
782 if (!need_resched()) {
783 idled = 1;
784 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax);
785 }
786 if (polling)
787 set_thread_flag(TIF_POLLING_NRFLAG);
788
789 if (!idled)
790 return 0;
791
792 if (ret) {
1da177e4
LT		 793 static unsigned long t;
794
795 /* This always fails on some SMP boards running UP kernels.
796 * Only report the failure the first 5 times.
797 */
798 if (++t < 5)
799 {
800 printk(KERN_DEBUG "apm_do_idle failed (%d)\n",
801 (eax >> 8) & 0xff);
802 t = jiffies;
803 }
804 return -1;
805 }
806 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
807 return clock_slowed;
808}
809
810/**
811 * apm_do_busy - inform the BIOS the CPU is busy
812 *
813 * Request that the BIOS brings the CPU back to full performance.
814 */
815
816static void apm_do_busy(void)
817{
818 u32 dummy;
819
820 if (clock_slowed || ALWAYS_CALL_BUSY) {
821 (void) apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy);
822 clock_slowed = 0;
823 }
824}
825
826/*
827 * If no process has really been interested in
828 * the CPU for some time, we want to call BIOS
829 * power management - we probably want
830 * to conserve power.
831 */
832#define IDLE_CALC_LIMIT (HZ * 100)
833#define IDLE_LEAKY_MAX 16
834
835static void (*original_pm_idle)(void);
836
837extern void default_idle(void);
838
839/**
840 * apm_cpu_idle - cpu idling for APM capable Linux
841 *
842 * This is the idling function the kernel executes when APM is available. It
843 * tries to do BIOS powermanagement based on the average system idle time.
844 * Furthermore it calls the system default idle routine.
845 */
846
847static void apm_cpu_idle(void)
848{
849 static int use_apm_idle; /* = 0 */
850 static unsigned int last_jiffies; /* = 0 */
851 static unsigned int last_stime; /* = 0 */
852
853 int apm_idle_done = 0;
854 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
855 unsigned int bucket;
856
857recalc:
858 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
859 use_apm_idle = 0;
860 last_jiffies = jiffies;
861 last_stime = current->stime;
862 } else if (jiffies_since_last_check > idle_period) {
863 unsigned int idle_percentage;
864
865 idle_percentage = current->stime - last_stime;
866 idle_percentage *= 100;
867 idle_percentage /= jiffies_since_last_check;
868 use_apm_idle = (idle_percentage > idle_threshold);
869 if (apm_info.forbid_idle)
870 use_apm_idle = 0;
871 last_jiffies = jiffies;
872 last_stime = current->stime;
873 }
874
875 bucket = IDLE_LEAKY_MAX;
876
877 while (!need_resched()) {
878 if (use_apm_idle) {
879 unsigned int t;
880
881 t = jiffies;
882 switch (apm_do_idle()) {
883 case 0: apm_idle_done = 1;
884 if (t != jiffies) {
885 if (bucket) {
886 bucket = IDLE_LEAKY_MAX;
887 continue;
888 }
889 } else if (bucket) {
890 bucket--;
891 continue;
892 }
893 break;
894 case 1: apm_idle_done = 1;
895 break;
896 default: /* BIOS refused */
897 break;
898 }
899 }
900 if (original_pm_idle)
901 original_pm_idle();
902 else
903 default_idle();
904 jiffies_since_last_check = jiffies - last_jiffies;
905 if (jiffies_since_last_check > idle_period)
906 goto recalc;
907 }
908
909 if (apm_idle_done)
910 apm_do_busy();
911}
912
913/**
914 * apm_power_off - ask the BIOS to power off
915 *
916 * Handle the power off sequence. This is the one piece of code we
917 * will execute even on SMP machines. In order to deal with BIOS
918 * bugs we support real mode APM BIOS power off calls. We also make
919 * the SMP call on CPU0 as some systems will only honour this call
920 * on their first cpu.
921 */
922
923static void apm_power_off(void)
924{
925 unsigned char po_bios_call[] = {
926 0xb8, 0x00, 0x10, /* movw $0x1000,ax */
927 0x8e, 0xd0, /* movw ax,ss */
928 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
929 0xb8, 0x07, 0x53, /* movw $0x5307,ax */
930 0xbb, 0x01, 0x00, /* movw $0x0001,bx */
931 0xb9, 0x03, 0x00, /* movw $0x0003,cx */
932 0xcd, 0x15 /* int $0x15 */
933 };
934
1da177e4 935 /* Some bioses don't like being called from CPU != 0 */
1da177e4
LT		 936 if (apm_info.realmode_power_off)
937 {
938 (void)apm_save_cpus();
939 machine_real_restart(po_bios_call, sizeof(po_bios_call));
940 }
941 else
942 (void) set_system_power_state(APM_STATE_OFF);
943}
944
945#ifdef CONFIG_APM_DO_ENABLE
946
947/**
948 * apm_enable_power_management - enable BIOS APM power management
949 * @enable: enable yes/no
950 *
951 * Enable or disable the APM BIOS power services.
952 */
953
954static int apm_enable_power_management(int enable)
955{
956 u32 eax;
957
958 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
959 return APM_NOT_ENGAGED;
960 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
961 enable, &eax))
962 return (eax >> 8) & 0xff;
963 if (enable)
964 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
965 else
966 apm_info.bios.flags |= APM_BIOS_DISABLED;
967 return APM_SUCCESS;
968}
969#endif
970
971/**
972 * apm_get_power_status - get current power state
973 * @status: returned status
974 * @bat: battery info
975 * @life: estimated life
976 *
977 * Obtain the current power status from the APM BIOS. We return a
978 * status which gives the rough battery status, and current power
979 * source. The bat value returned give an estimate as a percentage
980 * of life and a status value for the battery. The estimated life
981 * if reported is a lifetime in secodnds/minutes at current powwer
982 * consumption.
983 */
984
985static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
986{
987 u32 eax;
988 u32 ebx;
989 u32 ecx;
990 u32 edx;
991 u32 dummy;
992
993 if (apm_info.get_power_status_broken)
994 return APM_32_UNSUPPORTED;
995 if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0,
996 &eax, &ebx, &ecx, &edx, &dummy))
997 return (eax >> 8) & 0xff;
998 *status = ebx;
999 *bat = ecx;
1000 if (apm_info.get_power_status_swabinminutes) {
1001 *life = swab16((u16)edx);
1002 *life |= 0x8000;
1003 } else
1004 *life = edx;
1005 return APM_SUCCESS;
1006}
1007
1008#if 0
1009static int apm_get_battery_status(u_short which, u_short *status,
1010 u_short *bat, u_short *life, u_short *nbat)
1011{
1012 u32 eax;
1013 u32 ebx;
1014 u32 ecx;
1015 u32 edx;
1016 u32 esi;
1017
1018 if (apm_info.connection_version < 0x0102) {
1019 /* pretend we only have one battery. */
1020 if (which != 1)
1021 return APM_BAD_DEVICE;
1022 *nbat = 1;
1023 return apm_get_power_status(status, bat, life);
1024 }
1025
1026 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1027 &ebx, &ecx, &edx, &esi))
1028 return (eax >> 8) & 0xff;
1029 *status = ebx;
1030 *bat = ecx;
1031 *life = edx;
1032 *nbat = esi;
1033 return APM_SUCCESS;
1034}
1035#endif
1036
1037/**
1038 * apm_engage_power_management - enable PM on a device
1039 * @device: identity of device
1040 * @enable: on/off
1041 *
1042 * Activate or deactive power management on either a specific device
1043 * or the entire system (%APM_DEVICE_ALL).
1044 */
1045
1046static int apm_engage_power_management(u_short device, int enable)
1047{
1048 u32 eax;
1049
1050 if ((enable == 0) && (device == APM_DEVICE_ALL)
1051 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1052 return APM_DISABLED;
1053 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax))
1054 return (eax >> 8) & 0xff;
1055 if (device == APM_DEVICE_ALL) {
1056 if (enable)
1057 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1058 else
1059 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1060 }
1061 return APM_SUCCESS;
1062}
1063
1064#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1065
1066/**
1067 * apm_console_blank - blank the display
1068 * @blank: on/off
1069 *
1070 * Attempt to blank the console, firstly by blanking just video device
1071 * zero, and if that fails (some BIOSes don't support it) then it blanks
1072 * all video devices. Typically the BIOS will do laptop backlight and
1073 * monitor powerdown for us.
1074 */
1075
1076static int apm_console_blank(int blank)
1077{
1078 int error;
1079 u_short state;
1080
1081 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1082 /* Blank the first display device */
1083 error = set_power_state(0x100, state);
1084 if ((error != APM_SUCCESS) && (error != APM_NO_ERROR)) {
1085 /* try to blank them all instead */
1086 error = set_power_state(0x1ff, state);
1087 if ((error != APM_SUCCESS) && (error != APM_NO_ERROR))
1088 /* try to blank device one instead */
1089 error = set_power_state(0x101, state);
1090 }
1091 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1092 return 1;
1093 if (error == APM_NOT_ENGAGED) {
1094 static int tried;
1095 int eng_error;
1096 if (tried++ == 0) {
1097 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1098 if (eng_error) {
1099 apm_error("set display", error);
1100 apm_error("engage interface", eng_error);
1101 return 0;
1102 } else
1103 return apm_console_blank(blank);
1104 }
1105 }
1106 apm_error("set display", error);
1107 return 0;
1108}
1109#endif
1110
1111static int queue_empty(struct apm_user *as)
1112{
1113 return as->event_head == as->event_tail;
1114}
1115
1116static apm_event_t get_queued_event(struct apm_user *as)
1117{
1118 as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
1119 return as->events[as->event_tail];
1120}
1121
1122static void queue_event(apm_event_t event, struct apm_user *sender)
1123{
1124 struct apm_user * as;
1125
1126 spin_lock(&user_list_lock);
1127 if (user_list == NULL)
1128 goto out;
1129 for (as = user_list; as != NULL; as = as->next) {
1130 if ((as == sender) || (!as->reader))
1131 continue;
1132 as->event_head = (as->event_head + 1) % APM_MAX_EVENTS;
1133 if (as->event_head == as->event_tail) {
1134 static int notified;
1135
1136 if (notified++ == 0)
1137 printk(KERN_ERR "apm: an event queue overflowed\n");
1138 as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
1139 }
1140 as->events[as->event_head] = event;
1141 if ((!as->suser) || (!as->writer))
1142 continue;
1143 switch (event) {
1144 case APM_SYS_SUSPEND:
1145 case APM_USER_SUSPEND:
1146 as->suspends_pending++;
1147 suspends_pending++;
1148 break;
1149
1150 case APM_SYS_STANDBY:
1151 case APM_USER_STANDBY:
1152 as->standbys_pending++;
1153 standbys_pending++;
1154 break;
1155 }
1156 }
1157 wake_up_interruptible(&apm_waitqueue);
1158out:
1159 spin_unlock(&user_list_lock);
1160}
1161
1162static void set_time(void)
1163{
1164 if (got_clock_diff) { /* Must know time zone in order to set clock */
1165 xtime.tv_sec = get_cmos_time() + clock_cmos_diff;
1166 xtime.tv_nsec = 0;
1167 }
1168}
1169
1170static void get_time_diff(void)
1171{
1172#ifndef CONFIG_APM_RTC_IS_GMT
1173 /*
1174 * Estimate time zone so that set_time can update the clock
1175 */
1176 clock_cmos_diff = -get_cmos_time();
1177 clock_cmos_diff += get_seconds();
1178 got_clock_diff = 1;
1179#endif
1180}
1181
1182static void reinit_timer(void)
1183{
1184#ifdef INIT_TIMER_AFTER_SUSPEND
306e440d 1185 unsigned long flags;
1da177e4
LT		 1186
1187 spin_lock_irqsave(&i8253_lock, flags);
1188 /* set the clock to 100 Hz */
1189 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1190 udelay(10);
1191 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1192 udelay(10);
1193 outb(LATCH >> 8, PIT_CH0); /* MSB */
1194 udelay(10);
1195 spin_unlock_irqrestore(&i8253_lock, flags);
1196#endif
1197}
1198
1199static int suspend(int vetoable)
1200{
1201 int err;
1202 struct apm_user *as;
1203
1204 if (pm_send_all(PM_SUSPEND, (void *)3)) {
1205 /* Vetoed */
1206 if (vetoable) {
1207 if (apm_info.connection_version > 0x100)
1208 set_system_power_state(APM_STATE_REJECT);
1209 err = -EBUSY;
1210 ignore_sys_suspend = 0;
1211 printk(KERN_WARNING "apm: suspend was vetoed.\n");
1212 goto out;
1213 }
1214 printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
1215 }
1216
1217 device_suspend(PMSG_SUSPEND);
1218 local_irq_disable();
1219 device_power_down(PMSG_SUSPEND);
1220
1221 /* serialize with the timer interrupt */
1222 write_seqlock(&xtime_lock);
1223
1224 /* protect against access to timer chip registers */
1225 spin_lock(&i8253_lock);
1226
1227 get_time_diff();
1228 /*
1229 * Irq spinlock must be dropped around set_system_power_state.
1230 * We'll undo any timer changes due to interrupts below.
1231 */
1232 spin_unlock(&i8253_lock);
1233 write_sequnlock(&xtime_lock);
1234 local_irq_enable();
1235
1236 save_processor_state();
1237 err = set_system_power_state(APM_STATE_SUSPEND);
92c6dc59 1238 ignore_normal_resume = 1;
1da177e4
LT		 1239 restore_processor_state();
1240
1241 local_irq_disable();
1242 write_seqlock(&xtime_lock);
1243 spin_lock(&i8253_lock);
1244 reinit_timer();
1245 set_time();
1da177e4
LT		 1246
1247 spin_unlock(&i8253_lock);
1248 write_sequnlock(&xtime_lock);
1249
1250 if (err == APM_NO_ERROR)
1251 err = APM_SUCCESS;
1252 if (err != APM_SUCCESS)
1253 apm_error("suspend", err);
1254 err = (err == APM_SUCCESS) ? 0 : -EIO;
1255 device_power_up();
1256 local_irq_enable();
1257 device_resume();
1258 pm_send_all(PM_RESUME, (void *)0);
1259 queue_event(APM_NORMAL_RESUME, NULL);
1260 out:
1261 spin_lock(&user_list_lock);
1262 for (as = user_list; as != NULL; as = as->next) {
1263 as->suspend_wait = 0;
1264 as->suspend_result = err;
1265 }
1266 spin_unlock(&user_list_lock);
1267 wake_up_interruptible(&apm_suspend_waitqueue);
1268 return err;
1269}
1270
1271static void standby(void)
1272{
1273 int err;
1274
1275 local_irq_disable();
1276 device_power_down(PMSG_SUSPEND);
1277 /* serialize with the timer interrupt */
1278 write_seqlock(&xtime_lock);
1279 /* If needed, notify drivers here */
1280 get_time_diff();
1281 write_sequnlock(&xtime_lock);
1282 local_irq_enable();
1283
1284 err = set_system_power_state(APM_STATE_STANDBY);
1285 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1286 apm_error("standby", err);
1287
1288 local_irq_disable();
1289 device_power_up();
1290 local_irq_enable();
1291}
1292
1293static apm_event_t get_event(void)
1294{
1295 int error;
1296 apm_event_t event;
1297 apm_eventinfo_t info;
1298
1299 static int notified;
1300
1301 /* we don't use the eventinfo */
1302 error = apm_get_event(&event, &info);
1303 if (error == APM_SUCCESS)
1304 return event;
1305
1306 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1307 apm_error("get_event", error);
1308
1309 return 0;
1310}
1311
1312static void check_events(void)
1313{
1314 apm_event_t event;
1315 static unsigned long last_resume;
1316 static int ignore_bounce;
1317
1318 while ((event = get_event()) != 0) {
1319 if (debug) {
1320 if (event <= NR_APM_EVENT_NAME)
1321 printk(KERN_DEBUG "apm: received %s notify\n",
1322 apm_event_name[event - 1]);
1323 else
1324 printk(KERN_DEBUG "apm: received unknown "
1325 "event 0x%02x\n", event);
1326 }
1327 if (ignore_bounce
1328 && ((jiffies - last_resume) > bounce_interval))
1329 ignore_bounce = 0;
1330
1331 switch (event) {
1332 case APM_SYS_STANDBY:
1333 case APM_USER_STANDBY:
1334 queue_event(event, NULL);
1335 if (standbys_pending <= 0)
1336 standby();
1337 break;
1338
1339 case APM_USER_SUSPEND:
1340#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1341 if (apm_info.connection_version > 0x100)
1342 set_system_power_state(APM_STATE_REJECT);
1343 break;
1344#endif
1345 case APM_SYS_SUSPEND:
1346 if (ignore_bounce) {
1347 if (apm_info.connection_version > 0x100)
1348 set_system_power_state(APM_STATE_REJECT);
1349 break;
1350 }
1351 /*
1352 * If we are already processing a SUSPEND,
1353 * then further SUSPEND events from the BIOS
1354 * will be ignored. We also return here to
1355 * cope with the fact that the Thinkpads keep
1356 * sending a SUSPEND event until something else
1357 * happens!
1358 */
1359 if (ignore_sys_suspend)
1360 return;
1361 ignore_sys_suspend = 1;
1362 queue_event(event, NULL);
1363 if (suspends_pending <= 0)
1364 (void) suspend(1);
1365 break;
1366
1367 case APM_NORMAL_RESUME:
1368 case APM_CRITICAL_RESUME:
1369 case APM_STANDBY_RESUME:
1370 ignore_sys_suspend = 0;
1371 last_resume = jiffies;
1372 ignore_bounce = 1;
1373 if ((event != APM_NORMAL_RESUME)
1374 || (ignore_normal_resume == 0)) {
1375 write_seqlock_irq(&xtime_lock);
1376 set_time();
1377 write_sequnlock_irq(&xtime_lock);
1378 device_resume();
1379 pm_send_all(PM_RESUME, (void *)0);
1380 queue_event(event, NULL);
1381 }
1382 ignore_normal_resume = 0;
1383 break;
1384
1385 case APM_CAPABILITY_CHANGE:
1386 case APM_LOW_BATTERY:
1387 case APM_POWER_STATUS_CHANGE:
1388 queue_event(event, NULL);
1389 /* If needed, notify drivers here */
1390 break;
1391
1392 case APM_UPDATE_TIME:
1393 write_seqlock_irq(&xtime_lock);
1394 set_time();
1395 write_sequnlock_irq(&xtime_lock);
1396 break;
1397
1398 case APM_CRITICAL_SUSPEND:
1399 /*
1400 * We are not allowed to reject a critical suspend.
1401 */
1402 (void) suspend(0);
1403 break;
1404 }
1405 }
1406}
1407
1408static void apm_event_handler(void)
1409{
1410 static int pending_count = 4;
1411 int err;
1412
1413 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1414 if ((apm_info.connection_version > 0x100) &&
1415 (pending_count-- <= 0)) {
1416 pending_count = 4;
1417 if (debug)
1418 printk(KERN_DEBUG "apm: setting state busy\n");
1419 err = set_system_power_state(APM_STATE_BUSY);
1420 if (err)
1421 apm_error("busy", err);
1422 }
1423 } else
1424 pending_count = 4;
1425 check_events();
1426}
1427
1428/*
1429 * This is the APM thread main loop.
1430 */
1431
1432static void apm_mainloop(void)
1433{
1434 DECLARE_WAITQUEUE(wait, current);
1435
1436 add_wait_queue(&apm_waitqueue, &wait);
1437 set_current_state(TASK_INTERRUPTIBLE);
1438 for (;;) {
1439 schedule_timeout(APM_CHECK_TIMEOUT);
1440 if (exit_kapmd)
1441 break;
1442 /*
1443 * Ok, check all events, check for idle (and mark us sleeping
1444 * so as not to count towards the load average)..
1445 */
1446 set_current_state(TASK_INTERRUPTIBLE);
1447 apm_event_handler();
1448 }
1449 remove_wait_queue(&apm_waitqueue, &wait);
1450}
1451
1452static int check_apm_user(struct apm_user *as, const char *func)
1453{
1454 if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) {
1455 printk(KERN_ERR "apm: %s passed bad filp\n", func);
1456 return 1;
1457 }
1458 return 0;
1459}
1460
1461static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1462{
1463 struct apm_user * as;
1464 int i;
1465 apm_event_t event;
1466
1467 as = fp->private_data;
1468 if (check_apm_user(as, "read"))
1469 return -EIO;
1470 if ((int)count < sizeof(apm_event_t))
1471 return -EINVAL;
1472 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1473 return -EAGAIN;
1474 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1475 i = count;
1476 while ((i >= sizeof(event)) && !queue_empty(as)) {
1477 event = get_queued_event(as);
1478 if (copy_to_user(buf, &event, sizeof(event))) {
1479 if (i < count)
1480 break;
1481 return -EFAULT;
1482 }
1483 switch (event) {
1484 case APM_SYS_SUSPEND:
1485 case APM_USER_SUSPEND:
1486 as->suspends_read++;
1487 break;
1488
1489 case APM_SYS_STANDBY:
1490 case APM_USER_STANDBY:
1491 as->standbys_read++;
1492 break;
1493 }
1494 buf += sizeof(event);
1495 i -= sizeof(event);
1496 }
1497 if (i < count)
1498 return count - i;
1499 if (signal_pending(current))
1500 return -ERESTARTSYS;
1501 return 0;
1502}
1503
1504static unsigned int do_poll(struct file *fp, poll_table * wait)
1505{
1506 struct apm_user * as;
1507
1508 as = fp->private_data;
1509 if (check_apm_user(as, "poll"))
1510 return 0;
1511 poll_wait(fp, &apm_waitqueue, wait);
1512 if (!queue_empty(as))
1513 return POLLIN | POLLRDNORM;
1514 return 0;
1515}
1516
1517static int do_ioctl(struct inode * inode, struct file *filp,
1518 u_int cmd, u_long arg)
1519{
1520 struct apm_user * as;
1521
1522 as = filp->private_data;
1523 if (check_apm_user(as, "ioctl"))
1524 return -EIO;
1525 if ((!as->suser) || (!as->writer))
1526 return -EPERM;
1527 switch (cmd) {
1528 case APM_IOC_STANDBY:
1529 if (as->standbys_read > 0) {
1530 as->standbys_read--;
1531 as->standbys_pending--;
1532 standbys_pending--;
1533 } else
1534 queue_event(APM_USER_STANDBY, as);
1535 if (standbys_pending <= 0)
1536 standby();
1537 break;
1538 case APM_IOC_SUSPEND:
1539 if (as->suspends_read > 0) {
1540 as->suspends_read--;
1541 as->suspends_pending--;
1542 suspends_pending--;
1543 } else
1544 queue_event(APM_USER_SUSPEND, as);
1545 if (suspends_pending <= 0) {
1546 return suspend(1);
1547 } else {
1548 as->suspend_wait = 1;
1549 wait_event_interruptible(apm_suspend_waitqueue,
1550 as->suspend_wait == 0);
1551 return as->suspend_result;
1552 }
1553 break;
1554 default:
1555 return -EINVAL;
1556 }
1557 return 0;
1558}
1559
1560static int do_release(struct inode * inode, struct file * filp)
1561{
1562 struct apm_user * as;
1563
1564 as = filp->private_data;
1565 if (check_apm_user(as, "release"))
1566 return 0;
1567 filp->private_data = NULL;
1568 if (as->standbys_pending > 0) {
1569 standbys_pending -= as->standbys_pending;
1570 if (standbys_pending <= 0)
1571 standby();
1572 }
1573 if (as->suspends_pending > 0) {
1574 suspends_pending -= as->suspends_pending;
1575 if (suspends_pending <= 0)
1576 (void) suspend(1);
1577 }
1578 spin_lock(&user_list_lock);
1579 if (user_list == as)
1580 user_list = as->next;
1581 else {
1582 struct apm_user * as1;
1583
1584 for (as1 = user_list;
1585 (as1 != NULL) && (as1->next != as);
1586 as1 = as1->next)
1587 ;
1588 if (as1 == NULL)
1589 printk(KERN_ERR "apm: filp not in user list\n");
1590 else
1591 as1->next = as->next;
1592 }
1593 spin_unlock(&user_list_lock);
1594 kfree(as);
1595 return 0;
1596}
1597
1598static int do_open(struct inode * inode, struct file * filp)
1599{
1600 struct apm_user * as;
1601
1602 as = (struct apm_user *)kmalloc(sizeof(*as), GFP_KERNEL);
1603 if (as == NULL) {
1604 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1605 sizeof(*as));
1606 return -ENOMEM;
1607 }
1608 as->magic = APM_BIOS_MAGIC;
1609 as->event_tail = as->event_head = 0;
1610 as->suspends_pending = as->standbys_pending = 0;
1611 as->suspends_read = as->standbys_read = 0;
1612 /*
1613 * XXX - this is a tiny bit broken, when we consider BSD
1614 * process accounting. If the device is opened by root, we
1615 * instantly flag that we used superuser privs. Who knows,
1616 * we might close the device immediately without doing a
1617 * privileged operation -- cevans
1618 */
1619 as->suser = capable(CAP_SYS_ADMIN);
1620 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1621 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1622 spin_lock(&user_list_lock);
1623 as->next = user_list;
1624 user_list = as;
1625 spin_unlock(&user_list_lock);
1626 filp->private_data = as;
1627 return 0;
1628}
1629
1630static int apm_get_info(char *buf, char **start, off_t fpos, int length)
1631{
1632 char * p;
1633 unsigned short bx;
1634 unsigned short cx;
1635 unsigned short dx;
1636 int error;
1637 unsigned short ac_line_status = 0xff;
1638 unsigned short battery_status = 0xff;
1639 unsigned short battery_flag = 0xff;
1640 int percentage = -1;
1641 int time_units = -1;
1642 char *units = "?";
1643
1644 p = buf;
1645
1646 if ((num_online_cpus() == 1) &&
1647 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1648 ac_line_status = (bx >> 8) & 0xff;
1649 battery_status = bx & 0xff;
1650 if ((cx & 0xff) != 0xff)
1651 percentage = cx & 0xff;
1652
1653 if (apm_info.connection_version > 0x100) {
1654 battery_flag = (cx >> 8) & 0xff;
1655 if (dx != 0xffff) {
1656 units = (dx & 0x8000) ? "min" : "sec";
1657 time_units = dx & 0x7fff;
1658 }
1659 }
1660 }
1661 /* Arguments, with symbols from linux/apm_bios.h. Information is
1662 from the Get Power Status (0x0a) call unless otherwise noted.
1663
1664 0) Linux driver version (this will change if format changes)
1665 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1666 2) APM flags from APM Installation Check (0x00):
1667 bit 0: APM_16_BIT_SUPPORT
1668 bit 1: APM_32_BIT_SUPPORT
1669 bit 2: APM_IDLE_SLOWS_CLOCK
1670 bit 3: APM_BIOS_DISABLED
1671 bit 4: APM_BIOS_DISENGAGED
1672 3) AC line status
1673 0x00: Off-line
1674 0x01: On-line
1675 0x02: On backup power (BIOS >= 1.1 only)
1676 0xff: Unknown
1677 4) Battery status
1678 0x00: High
1679 0x01: Low
1680 0x02: Critical
1681 0x03: Charging
1682 0x04: Selected battery not present (BIOS >= 1.2 only)
1683 0xff: Unknown
1684 5) Battery flag
1685 bit 0: High
1686 bit 1: Low
1687 bit 2: Critical
1688 bit 3: Charging
1689 bit 7: No system battery
1690 0xff: Unknown
1691 6) Remaining battery life (percentage of charge):
1692 0-100: valid
1693 -1: Unknown
1694 7) Remaining battery life (time units):
1695 Number of remaining minutes or seconds
1696 -1: Unknown
1697 8) min = minutes; sec = seconds */
1698
1699 p += sprintf(p, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1700 driver_version,
1701 (apm_info.bios.version >> 8) & 0xff,
1702 apm_info.bios.version & 0xff,
1703 apm_info.bios.flags,
1704 ac_line_status,
1705 battery_status,
1706 battery_flag,
1707 percentage,
1708 time_units,
1709 units);
1710
1711 return p - buf;
1712}
1713
1714static int apm(void *unused)
1715{
1716 unsigned short bx;
1717 unsigned short cx;
1718 unsigned short dx;
1719 int error;
1720 char * power_stat;
1721 char * bat_stat;
1722
1723 kapmd_running = 1;
1724
1725 daemonize("kapmd");
1726
1727 current->flags |= PF_NOFREEZE;
1728
1729#ifdef CONFIG_SMP
1730 /* 2002/08/01 - WT
1731 * This is to avoid random crashes at boot time during initialization
1732 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1733 * Some bioses don't like being called from CPU != 0.
1734 * Method suggested by Ingo Molnar.
1735 */
1736 set_cpus_allowed(current, cpumask_of_cpu(0));
1737 BUG_ON(smp_processor_id() != 0);
1738#endif
1739
1740 if (apm_info.connection_version == 0) {
1741 apm_info.connection_version = apm_info.bios.version;
1742 if (apm_info.connection_version > 0x100) {
1743 /*
1744 * We only support BIOSs up to version 1.2
1745 */
1746 if (apm_info.connection_version > 0x0102)
1747 apm_info.connection_version = 0x0102;
1748 error = apm_driver_version(&apm_info.connection_version);
1749 if (error != APM_SUCCESS) {
1750 apm_error("driver version", error);
1751 /* Fall back to an APM 1.0 connection. */
1752 apm_info.connection_version = 0x100;
1753 }
1754 }
1755 }
1756
1757 if (debug)
1758 printk(KERN_INFO "apm: Connection version %d.%d\n",
1759 (apm_info.connection_version >> 8) & 0xff,
1760 apm_info.connection_version & 0xff);
1761
1762#ifdef CONFIG_APM_DO_ENABLE
1763 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1764 /*
1765 * This call causes my NEC UltraLite Versa 33/C to hang if it
1766 * is booted with PM disabled but not in the docking station.
1767 * Unfortunate ...
1768 */
1769 error = apm_enable_power_management(1);
1770 if (error) {
1771 apm_error("enable power management", error);
1772 return -1;
1773 }
1774 }
1775#endif
1776
1777 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1778 && (apm_info.connection_version > 0x0100)) {
1779 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1780 if (error) {
1781 apm_error("engage power management", error);
1782 return -1;
1783 }
1784 }
1785
1786 if (debug && (num_online_cpus() == 1 || smp )) {
1787 error = apm_get_power_status(&bx, &cx, &dx);
1788 if (error)
1789 printk(KERN_INFO "apm: power status not available\n");
1790 else {
1791 switch ((bx >> 8) & 0xff) {
1792 case 0: power_stat = "off line"; break;
1793 case 1: power_stat = "on line"; break;
1794 case 2: power_stat = "on backup power"; break;
1795 default: power_stat = "unknown"; break;
1796 }
1797 switch (bx & 0xff) {
1798 case 0: bat_stat = "high"; break;
1799 case 1: bat_stat = "low"; break;
1800 case 2: bat_stat = "critical"; break;
1801 case 3: bat_stat = "charging"; break;
1802 default: bat_stat = "unknown"; break;
1803 }
1804 printk(KERN_INFO
1805 "apm: AC %s, battery status %s, battery life ",
1806 power_stat, bat_stat);
1807 if ((cx & 0xff) == 0xff)
1808 printk("unknown\n");
1809 else
1810 printk("%d%%\n", cx & 0xff);
1811 if (apm_info.connection_version > 0x100) {
1812 printk(KERN_INFO
1813 "apm: battery flag 0x%02x, battery life ",
1814 (cx >> 8) & 0xff);
1815 if (dx == 0xffff)
1816 printk("unknown\n");
1817 else
1818 printk("%d %s\n", dx & 0x7fff,
1819 (dx & 0x8000) ?
1820 "minutes" : "seconds");
1821 }
1822 }
1823 }
1824
1825 /* Install our power off handler.. */
1826 if (power_off)
1827 pm_power_off = apm_power_off;
1828
1829 if (num_online_cpus() == 1 || smp) {
1830#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1831 console_blank_hook = apm_console_blank;
1832#endif
1833 apm_mainloop();
1834#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1835 console_blank_hook = NULL;
1836#endif
1837 }
1838 kapmd_running = 0;
1839
1840 return 0;
1841}
1842
1843#ifndef MODULE
1844static int __init apm_setup(char *str)
1845{
1846 int invert;
1847
1848 while ((str != NULL) && (*str != '\0')) {
1849 if (strncmp(str, "off", 3) == 0)
1850 apm_disabled = 1;
1851 if (strncmp(str, "on", 2) == 0)
1852 apm_disabled = 0;
1853 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1854 (strncmp(str, "bounce_interval=", 16) == 0))
1855 bounce_interval = simple_strtol(str + 16, NULL, 0);
1856 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1857 (strncmp(str, "idle_threshold=", 15) == 0))
1858 idle_threshold = simple_strtol(str + 15, NULL, 0);
1859 if ((strncmp(str, "idle-period=", 12) == 0) ||
1860 (strncmp(str, "idle_period=", 12) == 0))
1861 idle_period = simple_strtol(str + 12, NULL, 0);
1862 invert = (strncmp(str, "no-", 3) == 0) ||
1863 (strncmp(str, "no_", 3) == 0);
1864 if (invert)
1865 str += 3;
1866 if (strncmp(str, "debug", 5) == 0)
1867 debug = !invert;
1868 if ((strncmp(str, "power-off", 9) == 0) ||
1869 (strncmp(str, "power_off", 9) == 0))
1870 power_off = !invert;
1871 if (strncmp(str, "smp", 3) == 0)
1872 {
1873 smp = !invert;
1874 idle_threshold = 100;
1875 }
1876 if ((strncmp(str, "allow-ints", 10) == 0) ||
1877 (strncmp(str, "allow_ints", 10) == 0))
1878 apm_info.allow_ints = !invert;
1879 if ((strncmp(str, "broken-psr", 10) == 0) ||
1880 (strncmp(str, "broken_psr", 10) == 0))
1881 apm_info.get_power_status_broken = !invert;
1882 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1883 (strncmp(str, "realmode_power_off", 18) == 0))
1884 apm_info.realmode_power_off = !invert;
1885 str = strchr(str, ',');
1886 if (str != NULL)
1887 str += strspn(str, ", \t");
1888 }
1889 return 1;
1890}
1891
1892__setup("apm=", apm_setup);
1893#endif
1894
1895static struct file_operations apm_bios_fops = {
1896 .owner = THIS_MODULE,
1897 .read = do_read,
1898 .poll = do_poll,
1899 .ioctl = do_ioctl,
1900 .open = do_open,
1901 .release = do_release,
1902};
1903
1904static struct miscdevice apm_device = {
1905 APM_MINOR_DEV,
1906 "apm_bios",
1907 &apm_bios_fops
1908};
1909
1910
1911/* Simple "print if true" callback */
1912static int __init print_if_true(struct dmi_system_id *d)
1913{
1914 printk("%s\n", d->ident);
1915 return 0;
1916}
1917
1918/*
1919 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1920 * disabled before the suspend. Linux used to get terribly confused by that.
1921 */
1922static int __init broken_ps2_resume(struct dmi_system_id *d)
1923{
1924 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug workaround hopefully not needed.\n", d->ident);
1925 return 0;
1926}
1927
1928/* Some bioses have a broken protected mode poweroff and need to use realmode */
1929static int __init set_realmode_power_off(struct dmi_system_id *d)
1930{
1931 if (apm_info.realmode_power_off == 0) {
1932 apm_info.realmode_power_off = 1;
1933 printk(KERN_INFO "%s bios detected. Using realmode poweroff only.\n", d->ident);
1934 }
1935 return 0;
1936}
1937
1938/* Some laptops require interrupts to be enabled during APM calls */
1939static int __init set_apm_ints(struct dmi_system_id *d)
1940{
1941 if (apm_info.allow_ints == 0) {
1942 apm_info.allow_ints = 1;
1943 printk(KERN_INFO "%s machine detected. Enabling interrupts during APM calls.\n", d->ident);
1944 }
1945 return 0;
1946}
1947
1948/* Some APM bioses corrupt memory or just plain do not work */
1949static int __init apm_is_horked(struct dmi_system_id *d)
1950{
1951 if (apm_info.disabled == 0) {
1952 apm_info.disabled = 1;
1953 printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
1954 }
1955 return 0;
1956}
1957
1958static int __init apm_is_horked_d850md(struct dmi_system_id *d)
1959{
1960 if (apm_info.disabled == 0) {
1961 apm_info.disabled = 1;
1962 printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
1963 printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n");
1964 printk(KERN_INFO "download from support.intel.com \n");
1965 }
1966 return 0;
1967}
1968
1969/* Some APM bioses hang on APM idle calls */
1970static int __init apm_likes_to_melt(struct dmi_system_id *d)
1971{
1972 if (apm_info.forbid_idle == 0) {
1973 apm_info.forbid_idle = 1;
1974 printk(KERN_INFO "%s machine detected. Disabling APM idle calls.\n", d->ident);
1975 }
1976 return 0;
1977}
1978
1979/*
1980 * Check for clue free BIOS implementations who use
1981 * the following QA technique
1982 *
1983 * [ Write BIOS Code ]<------
1984 * | ^
1985 * < Does it Compile >----N--
1986 * |Y ^
1987 * < Does it Boot Win98 >-N--
1988 * |Y
1989 * [Ship It]
1990 *
1991 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
1992 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
1993 */
1994static int __init broken_apm_power(struct dmi_system_id *d)
1995{
1996 apm_info.get_power_status_broken = 1;
1997 printk(KERN_WARNING "BIOS strings suggest APM bugs, disabling power status reporting.\n");
1998 return 0;
1999}
2000
2001/*
2002 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2003 * have this problem).
2004 */
2005static int __init swab_apm_power_in_minutes(struct dmi_system_id *d)
2006{
2007 apm_info.get_power_status_swabinminutes = 1;
2008 printk(KERN_WARNING "BIOS strings suggest APM reports battery life in minutes and wrong byte order.\n");
2009 return 0;
2010}
2011
2012static struct dmi_system_id __initdata apm_dmi_table[] = {
2013 {
2014 print_if_true,
2015 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2016 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2017 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2018 },
2019 { /* Handle problems with APM on the C600 */
2020 broken_ps2_resume, "Dell Latitude C600",
2021 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2022 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2023 },
2024 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2025 set_apm_ints, "Dell Latitude",
2026 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2027 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2028 },
2029 { /* APM crashes */
2030 apm_is_horked, "Dell Inspiron 2500",
2031 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2032 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2033 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
2034 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2035 },
2036 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2037 set_apm_ints, "Dell Inspiron", {
2038 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2039 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2040 },
2041 { /* Handle problems with APM on Inspiron 5000e */
2042 broken_apm_power, "Dell Inspiron 5000e",
2043 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2044 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2045 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2046 },
2047 { /* Handle problems with APM on Inspiron 2500 */
2048 broken_apm_power, "Dell Inspiron 2500",
2049 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2050 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2051 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2052 },
2053 { /* APM crashes */
2054 apm_is_horked, "Dell Dimension 4100",
2055 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2056 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2057 DMI_MATCH(DMI_BIOS_VENDOR,"Intel Corp."),
2058 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2059 },
2060 { /* Allow interrupts during suspend on Compaq Laptops*/
2061 set_apm_ints, "Compaq 12XL125",
2062 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2063 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2064 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2065 DMI_MATCH(DMI_BIOS_VERSION,"4.06"), },
2066 },
2067 { /* Allow interrupts during APM or the clock goes slow */
2068 set_apm_ints, "ASUSTeK",
2069 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2070 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2071 },
2072 { /* APM blows on shutdown */
2073 apm_is_horked, "ABIT KX7-333[R]",
2074 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2075 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2076 },
2077 { /* APM crashes */
2078 apm_is_horked, "Trigem Delhi3",
2079 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2080 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2081 },
2082 { /* APM crashes */
2083 apm_is_horked, "Fujitsu-Siemens",
2084 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2085 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2086 },
2087 { /* APM crashes */
2088 apm_is_horked_d850md, "Intel D850MD",
2089 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2090 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2091 },
2092 { /* APM crashes */
2093 apm_is_horked, "Intel D810EMO",
2094 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2095 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2096 },
2097 { /* APM crashes */
2098 apm_is_horked, "Dell XPS-Z",
2099 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2100 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2101 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2102 },
2103 { /* APM crashes */
2104 apm_is_horked, "Sharp PC-PJ/AX",
2105 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2106 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2107 DMI_MATCH(DMI_BIOS_VENDOR,"SystemSoft"),
2108 DMI_MATCH(DMI_BIOS_VERSION,"Version R2.08"), },
2109 },
2110 { /* APM crashes */
2111 apm_is_horked, "Dell Inspiron 2500",
2112 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2113 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2114 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
2115 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2116 },
2117 { /* APM idle hangs */
2118 apm_likes_to_melt, "Jabil AMD",
2119 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2120 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2121 },
2122 { /* APM idle hangs */
2123 apm_likes_to_melt, "AMI Bios",
2124 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2125 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2126 },
2127 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2128 swab_apm_power_in_minutes, "Sony VAIO",
2129 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2130 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2131 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2132 },
2133 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2134 swab_apm_power_in_minutes, "Sony VAIO",
2135 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2136 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2137 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2138 },
2139 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2140 swab_apm_power_in_minutes, "Sony VAIO",
2141 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2142 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2143 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2144 },
2145 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2146 swab_apm_power_in_minutes, "Sony VAIO",
2147 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2148 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2149 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2150 },
2151 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2152 swab_apm_power_in_minutes, "Sony VAIO",
2153 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2154 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2155 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2156 },
2157 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2158 swab_apm_power_in_minutes, "Sony VAIO",
2159 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2160 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2161 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2162 },
2163 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2164 swab_apm_power_in_minutes, "Sony VAIO",
2165 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2166 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2167 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2168 },
2169 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2170 swab_apm_power_in_minutes, "Sony VAIO",
2171 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2172 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2173 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2174 },
2175 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2176 swab_apm_power_in_minutes, "Sony VAIO",
2177 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2178 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2179 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2180 },
2181 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2182 swab_apm_power_in_minutes, "Sony VAIO",
2183 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2184 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2185 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2186 },
2187
2188 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2189 swab_apm_power_in_minutes, "Sony VAIO",
2190 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2191 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2192 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2193 },
2194 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2195 swab_apm_power_in_minutes, "Sony VAIO",
2196 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2197 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2198 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2199 },
2200 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2201 swab_apm_power_in_minutes, "Sony VAIO",
2202 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2203 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2204 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2205 },
2206 { /* broken PM poweroff bios */
2207 set_realmode_power_off, "Award Software v4.60 PGMA",
2208 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2209 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2210 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2211 },
2212
2213 /* Generic per vendor APM settings */
2214
2215 { /* Allow interrupts during suspend on IBM laptops */
2216 set_apm_ints, "IBM",
2217 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2218 },
2219
2220 { }
2221};
2222
2223/*
2224 * Just start the APM thread. We do NOT want to do APM BIOS
2225 * calls from anything but the APM thread, if for no other reason
2226 * than the fact that we don't trust the APM BIOS. This way,
2227 * most common APM BIOS problems that lead to protection errors
2228 * etc will have at least some level of being contained...
2229 *
2230 * In short, if something bad happens, at least we have a choice
2231 * of just killing the apm thread..
2232 */
2233static int __init apm_init(void)
2234{
2235 struct proc_dir_entry *apm_proc;
2236 int ret;
2237 int i;
2238
2239 dmi_check_system(apm_dmi_table);
2240
2241 if (apm_info.bios.version == 0) {
2242 printk(KERN_INFO "apm: BIOS not found.\n");
2243 return -ENODEV;
2244 }
2245 printk(KERN_INFO
2246 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2247 ((apm_info.bios.version >> 8) & 0xff),
2248 (apm_info.bios.version & 0xff),
2249 apm_info.bios.flags,
2250 driver_version);
2251 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2252 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2253 return -ENODEV;
2254 }
2255
2256 if (allow_ints)
2257 apm_info.allow_ints = 1;
2258 if (broken_psr)
2259 apm_info.get_power_status_broken = 1;
2260 if (realmode_power_off)
2261 apm_info.realmode_power_off = 1;
2262 /* User can override, but default is to trust DMI */
2263 if (apm_disabled != -1)
2264 apm_info.disabled = apm_disabled;
2265
2266 /*
2267 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2268 * but is reportedly a 1.0 BIOS.
2269 */
2270 if (apm_info.bios.version == 0x001)
2271 apm_info.bios.version = 0x100;
2272
2273 /* BIOS < 1.2 doesn't set cseg_16_len */
2274 if (apm_info.bios.version < 0x102)
2275 apm_info.bios.cseg_16_len = 0; /* 64k */
2276
2277 if (debug) {
2278 printk(KERN_INFO "apm: entry %x:%lx cseg16 %x dseg %x",
2279 apm_info.bios.cseg, apm_info.bios.offset,
2280 apm_info.bios.cseg_16, apm_info.bios.dseg);
2281 if (apm_info.bios.version > 0x100)
2282 printk(" cseg len %x, dseg len %x",
2283 apm_info.bios.cseg_len,
2284 apm_info.bios.dseg_len);
2285 if (apm_info.bios.version > 0x101)
2286 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2287 printk("\n");
2288 }
2289
2290 if (apm_info.disabled) {
2291 printk(KERN_NOTICE "apm: disabled on user request.\n");
2292 return -ENODEV;
2293 }
2294 if ((num_online_cpus() > 1) && !power_off && !smp) {
2295 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2296 apm_info.disabled = 1;
2297 return -ENODEV;
2298 }
2299 if (PM_IS_ACTIVE()) {
2300 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2301 apm_info.disabled = 1;
2302 return -ENODEV;
2303 }
2304 pm_active = 1;
2305
2306 /*
2307 * Set up a segment that references the real mode segment 0x40
2308 * that extends up to the end of page zero (that we have reserved).
2309 * This is for buggy BIOS's that refer to (real mode) segment 0x40
2310 * even though they are called in protected mode.
2311 */
2312 set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
2313 _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
2314
2315 apm_bios_entry.offset = apm_info.bios.offset;
2316 apm_bios_entry.segment = APM_CS;
2317
2318 for (i = 0; i < NR_CPUS; i++) {
251e6912 2319 struct desc_struct *gdt = get_cpu_gdt_table(i);
7c4cb60e
ZA		 2320 if (!gdt)
2321 continue;
251e6912 2322 set_base(gdt[APM_CS >> 3],
1da177e4 2323 __va((unsigned long)apm_info.bios.cseg << 4));
251e6912 2324 set_base(gdt[APM_CS_16 >> 3],
1da177e4 2325 __va((unsigned long)apm_info.bios.cseg_16 << 4));
251e6912 2326 set_base(gdt[APM_DS >> 3],
1da177e4
LT		 2327 __va((unsigned long)apm_info.bios.dseg << 4));
2328#ifndef APM_RELAX_SEGMENTS
2329 if (apm_info.bios.version == 0x100) {
2330#endif
2331 /* For ASUS motherboard, Award BIOS rev 110 (and others?) */
251e6912 2332 _set_limit((char *)&gdt[APM_CS >> 3], 64 * 1024 - 1);
1da177e4 2333 /* For some unknown machine. */
251e6912 2334 _set_limit((char *)&gdt[APM_CS_16 >> 3], 64 * 1024 - 1);
1da177e4 2335 /* For the DEC Hinote Ultra CT475 (and others?) */
251e6912 2336 _set_limit((char *)&gdt[APM_DS >> 3], 64 * 1024 - 1);
1da177e4
LT		 2337#ifndef APM_RELAX_SEGMENTS
2338 } else {
251e6912 2339 _set_limit((char *)&gdt[APM_CS >> 3],
1da177e4 2340 (apm_info.bios.cseg_len - 1) & 0xffff);
251e6912 2341 _set_limit((char *)&gdt[APM_CS_16 >> 3],
1da177e4 2342 (apm_info.bios.cseg_16_len - 1) & 0xffff);
251e6912 2343 _set_limit((char *)&gdt[APM_DS >> 3],
1da177e4
LT		 2344 (apm_info.bios.dseg_len - 1) & 0xffff);
2345 /* workaround for broken BIOSes */
2346 if (apm_info.bios.cseg_len <= apm_info.bios.offset)
251e6912 2347 _set_limit((char *)&gdt[APM_CS >> 3], 64 * 1024 -1);
1da177e4
LT		 2348 if (apm_info.bios.dseg_len <= 0x40) { /* 0x40 * 4kB == 64kB */
2349 /* for the BIOS that assumes granularity = 1 */
251e6912 2350 gdt[APM_DS >> 3].b |= 0x800000;
1da177e4
LT		 2351 printk(KERN_NOTICE "apm: we set the granularity of dseg.\n");
2352 }
2353 }
2354#endif
2355 }
2356
2357 apm_proc = create_proc_info_entry("apm", 0, NULL, apm_get_info);
2358 if (apm_proc)
2359 apm_proc->owner = THIS_MODULE;
2360
2361 ret = kernel_thread(apm, NULL, CLONE_KERNEL | SIGCHLD);
2362 if (ret < 0) {
2363 printk(KERN_ERR "apm: disabled - Unable to start kernel thread.\n");
2364 return -ENOMEM;
2365 }
2366
2367 if (num_online_cpus() > 1 && !smp ) {
2368 printk(KERN_NOTICE
2369 "apm: disabled - APM is not SMP safe (power off active).\n");
2370 return 0;
2371 }
2372
2373 misc_register(&apm_device);
2374
2375 if (HZ != 100)
2376 idle_period = (idle_period * HZ) / 100;
2377 if (idle_threshold < 100) {
2378 original_pm_idle = pm_idle;
2379 pm_idle = apm_cpu_idle;
2380 set_pm_idle = 1;
2381 }
2382
2383 return 0;
2384}
2385
2386static void __exit apm_exit(void)
2387{
2388 int error;
2389
2390 if (set_pm_idle) {
2391 pm_idle = original_pm_idle;
2392 /*
2393 * We are about to unload the current idle thread pm callback
2394 * (pm_idle), Wait for all processors to update cached/local
2395 * copies of pm_idle before proceeding.
2396 */
2397 cpu_idle_wait();
2398 }
2399 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2400 && (apm_info.connection_version > 0x0100)) {
2401 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2402 if (error)
2403 apm_error("disengage power management", error);
2404 }
2405 misc_deregister(&apm_device);
2406 remove_proc_entry("apm", NULL);
2407 if (power_off)
2408 pm_power_off = NULL;
2409 exit_kapmd = 1;
2410 while (kapmd_running)
2411 schedule();
2412 pm_active = 0;
2413}
2414
2415module_init(apm_init);
2416module_exit(apm_exit);
2417
2418MODULE_AUTHOR("Stephen Rothwell");
2419MODULE_DESCRIPTION("Advanced Power Management");
2420MODULE_LICENSE("GPL");
2421module_param(debug, bool, 0644);
2422MODULE_PARM_DESC(debug, "Enable debug mode");
2423module_param(power_off, bool, 0444);
2424MODULE_PARM_DESC(power_off, "Enable power off");
2425module_param(bounce_interval, int, 0444);
2426MODULE_PARM_DESC(bounce_interval,
2427 "Set the number of ticks to ignore suspend bounces");
2428module_param(allow_ints, bool, 0444);
2429MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2430module_param(broken_psr, bool, 0444);
2431MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2432module_param(realmode_power_off, bool, 0444);
2433MODULE_PARM_DESC(realmode_power_off,
2434 "Switch to real mode before powering off");
2435module_param(idle_threshold, int, 0444);
2436MODULE_PARM_DESC(idle_threshold,
2437 "System idle percentage above which to make APM BIOS idle calls");
2438module_param(idle_period, int, 0444);
2439MODULE_PARM_DESC(idle_period,
2440 "Period (in sec/100) over which to caculate the idle percentage");
2441module_param(smp, bool, 0444);
2442MODULE_PARM_DESC(smp,
2443 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2444MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
Linux 6.x block layer and io_uring tree(s)