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[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
1da177e4
LT		 204#include <linux/module.h>
205
206#include <linux/poll.h>
207#include <linux/types.h>
208#include <linux/stddef.h>
209#include <linux/timer.h>
210#include <linux/fcntl.h>
211#include <linux/slab.h>
212#include <linux/stat.h>
213#include <linux/proc_fs.h>
214#include <linux/miscdevice.h>
215#include <linux/apm_bios.h>
216#include <linux/init.h>
217#include <linux/time.h>
218#include <linux/sched.h>
219#include <linux/pm.h>
bca73e4b 220#include <linux/pm_legacy.h>
a9415644 221#include <linux/capability.h>
1da177e4
LT		 222#include <linux/device.h>
223#include <linux/kernel.h>
224#include <linux/smp.h>
225#include <linux/smp_lock.h>
226#include <linux/dmi.h>
227#include <linux/suspend.h>
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
1da177e4
LT		 305/*
306 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
307 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
308 * David Chen <chen@ctpa04.mit.edu>
309 */
310#undef INIT_TIMER_AFTER_SUSPEND
311
312#ifdef INIT_TIMER_AFTER_SUSPEND
313#include <linux/timex.h>
314#include <asm/io.h>
315#include <linux/delay.h>
316#endif
317
318/*
319 * Need to poll the APM BIOS every second
320 */
321#define APM_CHECK_TIMEOUT (HZ)
322
323/*
324 * Ignore suspend events for this amount of time after a resume
325 */
326#define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
327
328/*
329 * Maximum number of events stored
330 */
331#define APM_MAX_EVENTS 20
332
333/*
334 * The per-file APM data
335 */
336struct apm_user {
337 int magic;
338 struct apm_user * next;
77617bd8
DP		 339 unsigned int suser: 1;
340 unsigned int writer: 1;
341 unsigned int reader: 1;
342 unsigned int suspend_wait: 1;
1da177e4
LT		 343 int suspend_result;
344 int suspends_pending;
345 int standbys_pending;
346 int suspends_read;
347 int standbys_read;
348 int event_head;
349 int event_tail;
350 apm_event_t events[APM_MAX_EVENTS];
351};
352
353/*
354 * The magic number in apm_user
355 */
356#define APM_BIOS_MAGIC 0x4101
357
358/*
359 * idle percentage above which bios idle calls are done
360 */
361#ifdef CONFIG_APM_CPU_IDLE
362#define DEFAULT_IDLE_THRESHOLD 95
363#else
364#define DEFAULT_IDLE_THRESHOLD 100
365#endif
366#define DEFAULT_IDLE_PERIOD (100 / 3)
367
368/*
369 * Local variables
370 */
371static struct {
372 unsigned long offset;
373 unsigned short segment;
374} apm_bios_entry;
375static int clock_slowed;
87af2ffd
AM		 376static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
377static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
1da177e4
LT		 378static int set_pm_idle;
379static int suspends_pending;
380static int standbys_pending;
381static int ignore_sys_suspend;
382static int ignore_normal_resume;
87af2ffd 383static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
1da177e4
LT		 384
385#ifdef CONFIG_APM_RTC_IS_GMT
386# define clock_cmos_diff 0
387# define got_clock_diff 1
388#else
389static long clock_cmos_diff;
390static int got_clock_diff;
391#endif
87af2ffd
AM		 392static int debug __read_mostly;
393static int smp __read_mostly;
1da177e4
LT		 394static int apm_disabled = -1;
395#ifdef CONFIG_SMP
396static int power_off;
397#else
398static int power_off = 1;
399#endif
400#ifdef CONFIG_APM_REAL_MODE_POWER_OFF
401static int realmode_power_off = 1;
402#else
403static int realmode_power_off;
404#endif
87af2ffd
AM		 405static int exit_kapmd __read_mostly;
406static int kapmd_running __read_mostly;
1da177e4
LT		 407#ifdef CONFIG_APM_ALLOW_INTS
408static int allow_ints = 1;
409#else
410static int allow_ints;
411#endif
412static int broken_psr;
413
414static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
415static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
416static struct apm_user * user_list;
417static DEFINE_SPINLOCK(user_list_lock);
87af2ffd 418static const struct desc_struct bad_bios_desc = { 0, 0x00409200 };
1da177e4 419
87af2ffd 420static const char driver_version[] = "1.16ac"; /* no spaces */
1da177e4
LT		 421
422/*
423 * APM event names taken from the APM 1.2 specification. These are
424 * the message codes that the BIOS uses to tell us about events
425 */
87af2ffd 426static const char * const apm_event_name[] = {
1da177e4
LT		 427 "system standby",
428 "system suspend",
429 "normal resume",
430 "critical resume",
431 "low battery",
432 "power status change",
433 "update time",
434 "critical suspend",
435 "user standby",
436 "user suspend",
437 "system standby resume",
438 "capabilities change"
439};
38e548ee 440#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
1da177e4
LT		 441
442typedef struct lookup_t {
443 int key;
444 char * msg;
445} lookup_t;
446
447/*
448 * The BIOS returns a set of standard error codes in AX when the
449 * carry flag is set.
450 */
451
452static const lookup_t error_table[] = {
453/* N/A { APM_SUCCESS, "Operation succeeded" }, */
454 { APM_DISABLED, "Power management disabled" },
455 { APM_CONNECTED, "Real mode interface already connected" },
456 { APM_NOT_CONNECTED, "Interface not connected" },
457 { APM_16_CONNECTED, "16 bit interface already connected" },
458/* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
459 { APM_32_CONNECTED, "32 bit interface already connected" },
460 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
461 { APM_BAD_DEVICE, "Unrecognized device ID" },
462 { APM_BAD_PARAM, "Parameter out of range" },
463 { APM_NOT_ENGAGED, "Interface not engaged" },
464 { APM_BAD_FUNCTION, "Function not supported" },
465 { APM_RESUME_DISABLED, "Resume timer disabled" },
466 { APM_BAD_STATE, "Unable to enter requested state" },
467/* N/A { APM_NO_EVENTS, "No events pending" }, */
468 { APM_NO_ERROR, "BIOS did not set a return code" },
469 { APM_NOT_PRESENT, "No APM present" }
470};
38e548ee 471#define ERROR_COUNT ARRAY_SIZE(error_table)
1da177e4
LT		 472
473/**
474 * apm_error - display an APM error
475 * @str: information string
476 * @err: APM BIOS return code
477 *
478 * Write a meaningful log entry to the kernel log in the event of
479 * an APM error.
480 */
481
482static void apm_error(char *str, int err)
483{
484 int i;
485
486 for (i = 0; i < ERROR_COUNT; i++)
487 if (error_table[i].key == err) break;
488 if (i < ERROR_COUNT)
489 printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
490 else
491 printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
492 str, err);
493}
494
495/*
496 * Lock APM functionality to physical CPU 0
497 */
498
499#ifdef CONFIG_SMP
500
501static cpumask_t apm_save_cpus(void)
502{
503 cpumask_t x = current->cpus_allowed;
504 /* Some bioses don't like being called from CPU != 0 */
505 set_cpus_allowed(current, cpumask_of_cpu(0));
506 BUG_ON(smp_processor_id() != 0);
507 return x;
508}
509
510static inline void apm_restore_cpus(cpumask_t mask)
511{
512 set_cpus_allowed(current, mask);
513}
514
515#else
516
517/*
518 * No CPU lockdown needed on a uniprocessor
519 */
520
521#define apm_save_cpus() (current->cpus_allowed)
522#define apm_restore_cpus(x) (void)(x)
523
524#endif
525
526/*
527 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
528 * apm_info.allow_ints, we are being really paranoid here! Not only
529 * are interrupts disabled, but all the segment registers (except SS)
530 * are saved and zeroed this means that if the BIOS tries to reference
531 * any data without explicitly loading the segment registers, the kernel
532 * will fault immediately rather than have some unforeseen circumstances
533 * for the rest of the kernel. And it will be very obvious! :-) Doing
534 * this depends on CS referring to the same physical memory as DS so that
535 * DS can be zeroed before the call. Unfortunately, we can't do anything
536 * about the stack segment/pointer. Also, we tell the compiler that
537 * everything could change.
538 *
539 * Also, we KNOW that for the non error case of apm_bios_call, there
540 * is no useful data returned in the low order 8 bits of eax.
541 */
542#define APM_DO_CLI \
543 if (apm_info.allow_ints) \
544 local_irq_enable(); \
545 else \
546 local_irq_disable();
547
548#ifdef APM_ZERO_SEGS
549# define APM_DECL_SEGS \
550 unsigned int saved_fs; unsigned int saved_gs;
551# define APM_DO_SAVE_SEGS \
552 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
553# define APM_DO_RESTORE_SEGS \
554 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
555#else
556# define APM_DECL_SEGS
557# define APM_DO_SAVE_SEGS
558# define APM_DO_RESTORE_SEGS
559#endif
560
561/**
562 * apm_bios_call - Make an APM BIOS 32bit call
563 * @func: APM function to execute
564 * @ebx_in: EBX register for call entry
565 * @ecx_in: ECX register for call entry
566 * @eax: EAX register return
567 * @ebx: EBX register return
568 * @ecx: ECX register return
569 * @edx: EDX register return
570 * @esi: ESI register return
571 *
572 * Make an APM call using the 32bit protected mode interface. The
573 * caller is responsible for knowing if APM BIOS is configured and
574 * enabled. This call can disable interrupts for a long period of
575 * time on some laptops. The return value is in AH and the carry
576 * flag is loaded into AL. If there is an error, then the error
577 * code is returned in AH (bits 8-15 of eax) and this function
578 * returns non-zero.
579 */
580
581static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in,
582 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi)
583{
584 APM_DECL_SEGS
585 unsigned long flags;
586 cpumask_t cpus;
587 int cpu;
588 struct desc_struct save_desc_40;
251e6912 589 struct desc_struct *gdt;
1da177e4
LT		 590
591 cpus = apm_save_cpus();
592
593 cpu = get_cpu();
251e6912
ZA		 594 gdt = get_cpu_gdt_table(cpu);
595 save_desc_40 = gdt[0x40 / 8];
596 gdt[0x40 / 8] = bad_bios_desc;
1da177e4
LT		 597
598 local_save_flags(flags);
599 APM_DO_CLI;
600 APM_DO_SAVE_SEGS;
601 apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi);
602 APM_DO_RESTORE_SEGS;
603 local_irq_restore(flags);
251e6912 604 gdt[0x40 / 8] = save_desc_40;
1da177e4
LT		 605 put_cpu();
606 apm_restore_cpus(cpus);
607
608 return *eax & 0xff;
609}
610
611/**
612 * apm_bios_call_simple - make a simple APM BIOS 32bit call
613 * @func: APM function to invoke
614 * @ebx_in: EBX register value for BIOS call
615 * @ecx_in: ECX register value for BIOS call
616 * @eax: EAX register on return from the BIOS call
617 *
87af2ffd 618 * Make a BIOS call that returns one value only, or just status.
1da177e4
LT		 619 * If there is an error, then the error code is returned in AH
620 * (bits 8-15 of eax) and this function returns non-zero. This is
621 * used for simpler BIOS operations. This call may hold interrupts
622 * off for a long time on some laptops.
623 */
624
625static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax)
626{
627 u8 error;
628 APM_DECL_SEGS
629 unsigned long flags;
630 cpumask_t cpus;
631 int cpu;
632 struct desc_struct save_desc_40;
251e6912 633 struct desc_struct *gdt;
1da177e4
LT		 634
635 cpus = apm_save_cpus();
636
637 cpu = get_cpu();
251e6912
ZA		 638 gdt = get_cpu_gdt_table(cpu);
639 save_desc_40 = gdt[0x40 / 8];
640 gdt[0x40 / 8] = bad_bios_desc;
1da177e4
LT		 641
642 local_save_flags(flags);
643 APM_DO_CLI;
644 APM_DO_SAVE_SEGS;
645 error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax);
646 APM_DO_RESTORE_SEGS;
647 local_irq_restore(flags);
251e6912 648 gdt[0x40 / 8] = save_desc_40;
1da177e4
LT		 649 put_cpu();
650 apm_restore_cpus(cpus);
651 return error;
652}
653
654/**
655 * apm_driver_version - APM driver version
656 * @val: loaded with the APM version on return
657 *
658 * Retrieve the APM version supported by the BIOS. This is only
659 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
660 * probably present.
661 *
662 * On entry val should point to a value indicating the APM driver
663 * version with the high byte being the major and the low byte the
664 * minor number both in BCD
665 *
666 * On return it will hold the BIOS revision supported in the
667 * same format.
668 */
669
670static int apm_driver_version(u_short *val)
671{
672 u32 eax;
673
674 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax))
675 return (eax >> 8) & 0xff;
676 *val = eax;
677 return APM_SUCCESS;
678}
679
680/**
681 * apm_get_event - get an APM event from the BIOS
682 * @event: pointer to the event
683 * @info: point to the event information
684 *
685 * The APM BIOS provides a polled information for event
686 * reporting. The BIOS expects to be polled at least every second
687 * when events are pending. When a message is found the caller should
688 * poll until no more messages are present. However, this causes
689 * problems on some laptops where a suspend event notification is
690 * not cleared until it is acknowledged.
691 *
692 * Additional information is returned in the info pointer, providing
693 * that APM 1.2 is in use. If no messges are pending the value 0x80
694 * is returned (No power management events pending).
695 */
696
697static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
698{
699 u32 eax;
700 u32 ebx;
701 u32 ecx;
702 u32 dummy;
703
704 if (apm_bios_call(APM_FUNC_GET_EVENT, 0, 0, &eax, &ebx, &ecx,
705 &dummy, &dummy))
706 return (eax >> 8) & 0xff;
707 *event = ebx;
708 if (apm_info.connection_version < 0x0102)
709 *info = ~0; /* indicate info not valid */
710 else
711 *info = ecx;
712 return APM_SUCCESS;
713}
714
715/**
716 * set_power_state - set the power management state
717 * @what: which items to transition
718 * @state: state to transition to
719 *
720 * Request an APM change of state for one or more system devices. The
721 * processor state must be transitioned last of all. what holds the
722 * class of device in the upper byte and the device number (0xFF for
723 * all) for the object to be transitioned.
724 *
725 * The state holds the state to transition to, which may in fact
726 * be an acceptance of a BIOS requested state change.
727 */
728
729static int set_power_state(u_short what, u_short state)
730{
731 u32 eax;
732
733 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax))
734 return (eax >> 8) & 0xff;
735 return APM_SUCCESS;
736}
737
738/**
739 * set_system_power_state - set system wide power state
740 * @state: which state to enter
741 *
742 * Transition the entire system into a new APM power state.
743 */
744
745static int set_system_power_state(u_short state)
746{
747 return set_power_state(APM_DEVICE_ALL, state);
748}
749
750/**
751 * apm_do_idle - perform power saving
752 *
753 * This function notifies the BIOS that the processor is (in the view
754 * of the OS) idle. It returns -1 in the event that the BIOS refuses
755 * to handle the idle request. On a success the function returns 1
756 * if the BIOS did clock slowing or 0 otherwise.
757 */
758
759static int apm_do_idle(void)
760{
761 u32 eax;
64c7c8f8
NP		 762 u8 ret = 0;
763 int idled = 0;
764 int polling;
765
495ab9c0 766 polling = !!(current_thread_info()->status & TS_POLLING);
64c7c8f8 767 if (polling) {
495ab9c0 768 current_thread_info()->status &= ~TS_POLLING;
64c7c8f8
NP		 769 smp_mb__after_clear_bit();
770 }
771 if (!need_resched()) {
772 idled = 1;
773 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax);
774 }
775 if (polling)
495ab9c0 776 current_thread_info()->status |= TS_POLLING;
64c7c8f8
NP		 777
778 if (!idled)
779 return 0;
780
781 if (ret) {
1da177e4
LT		 782 static unsigned long t;
783
784 /* This always fails on some SMP boards running UP kernels.
785 * Only report the failure the first 5 times.
786 */
787 if (++t < 5)
788 {
789 printk(KERN_DEBUG "apm_do_idle failed (%d)\n",
790 (eax >> 8) & 0xff);
791 t = jiffies;
792 }
793 return -1;
794 }
795 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
796 return clock_slowed;
797}
798
799/**
800 * apm_do_busy - inform the BIOS the CPU is busy
801 *
802 * Request that the BIOS brings the CPU back to full performance.
803 */
804
805static void apm_do_busy(void)
806{
807 u32 dummy;
808
809 if (clock_slowed || ALWAYS_CALL_BUSY) {
810 (void) apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy);
811 clock_slowed = 0;
812 }
813}
814
815/*
816 * If no process has really been interested in
817 * the CPU for some time, we want to call BIOS
818 * power management - we probably want
819 * to conserve power.
820 */
821#define IDLE_CALC_LIMIT (HZ * 100)
822#define IDLE_LEAKY_MAX 16
823
87af2ffd 824static void (*original_pm_idle)(void) __read_mostly;
1da177e4 825
1da177e4
LT		 826/**
827 * apm_cpu_idle - cpu idling for APM capable Linux
828 *
829 * This is the idling function the kernel executes when APM is available. It
830 * tries to do BIOS powermanagement based on the average system idle time.
831 * Furthermore it calls the system default idle routine.
832 */
833
834static void apm_cpu_idle(void)
835{
836 static int use_apm_idle; /* = 0 */
837 static unsigned int last_jiffies; /* = 0 */
838 static unsigned int last_stime; /* = 0 */
839
840 int apm_idle_done = 0;
841 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
842 unsigned int bucket;
843
844recalc:
845 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
846 use_apm_idle = 0;
847 last_jiffies = jiffies;
848 last_stime = current->stime;
849 } else if (jiffies_since_last_check > idle_period) {
850 unsigned int idle_percentage;
851
852 idle_percentage = current->stime - last_stime;
853 idle_percentage *= 100;
854 idle_percentage /= jiffies_since_last_check;
855 use_apm_idle = (idle_percentage > idle_threshold);
856 if (apm_info.forbid_idle)
857 use_apm_idle = 0;
858 last_jiffies = jiffies;
859 last_stime = current->stime;
860 }
861
862 bucket = IDLE_LEAKY_MAX;
863
864 while (!need_resched()) {
865 if (use_apm_idle) {
866 unsigned int t;
867
868 t = jiffies;
869 switch (apm_do_idle()) {
870 case 0: apm_idle_done = 1;
871 if (t != jiffies) {
872 if (bucket) {
873 bucket = IDLE_LEAKY_MAX;
874 continue;
875 }
876 } else if (bucket) {
877 bucket--;
878 continue;
879 }
880 break;
881 case 1: apm_idle_done = 1;
882 break;
883 default: /* BIOS refused */
884 break;
885 }
886 }
887 if (original_pm_idle)
888 original_pm_idle();
889 else
890 default_idle();
891 jiffies_since_last_check = jiffies - last_jiffies;
892 if (jiffies_since_last_check > idle_period)
893 goto recalc;
894 }
895
896 if (apm_idle_done)
897 apm_do_busy();
898}
899
900/**
901 * apm_power_off - ask the BIOS to power off
902 *
903 * Handle the power off sequence. This is the one piece of code we
904 * will execute even on SMP machines. In order to deal with BIOS
905 * bugs we support real mode APM BIOS power off calls. We also make
906 * the SMP call on CPU0 as some systems will only honour this call
907 * on their first cpu.
908 */
909
910static void apm_power_off(void)
911{
912 unsigned char po_bios_call[] = {
913 0xb8, 0x00, 0x10, /* movw $0x1000,ax */
914 0x8e, 0xd0, /* movw ax,ss */
915 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
916 0xb8, 0x07, 0x53, /* movw $0x5307,ax */
917 0xbb, 0x01, 0x00, /* movw $0x0001,bx */
918 0xb9, 0x03, 0x00, /* movw $0x0003,cx */
919 0xcd, 0x15 /* int $0x15 */
920 };
921
1da177e4 922 /* Some bioses don't like being called from CPU != 0 */
1da177e4
LT		 923 if (apm_info.realmode_power_off)
924 {
925 (void)apm_save_cpus();
926 machine_real_restart(po_bios_call, sizeof(po_bios_call));
927 }
928 else
929 (void) set_system_power_state(APM_STATE_OFF);
930}
931
932#ifdef CONFIG_APM_DO_ENABLE
933
934/**
935 * apm_enable_power_management - enable BIOS APM power management
936 * @enable: enable yes/no
937 *
938 * Enable or disable the APM BIOS power services.
939 */
940
941static int apm_enable_power_management(int enable)
942{
943 u32 eax;
944
945 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
946 return APM_NOT_ENGAGED;
947 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
948 enable, &eax))
949 return (eax >> 8) & 0xff;
950 if (enable)
951 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
952 else
953 apm_info.bios.flags |= APM_BIOS_DISABLED;
954 return APM_SUCCESS;
955}
956#endif
957
958/**
959 * apm_get_power_status - get current power state
960 * @status: returned status
961 * @bat: battery info
962 * @life: estimated life
963 *
964 * Obtain the current power status from the APM BIOS. We return a
965 * status which gives the rough battery status, and current power
966 * source. The bat value returned give an estimate as a percentage
967 * of life and a status value for the battery. The estimated life
968 * if reported is a lifetime in secodnds/minutes at current powwer
969 * consumption.
970 */
971
972static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
973{
974 u32 eax;
975 u32 ebx;
976 u32 ecx;
977 u32 edx;
978 u32 dummy;
979
980 if (apm_info.get_power_status_broken)
981 return APM_32_UNSUPPORTED;
982 if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0,
983 &eax, &ebx, &ecx, &edx, &dummy))
984 return (eax >> 8) & 0xff;
985 *status = ebx;
986 *bat = ecx;
987 if (apm_info.get_power_status_swabinminutes) {
988 *life = swab16((u16)edx);
989 *life |= 0x8000;
990 } else
991 *life = edx;
992 return APM_SUCCESS;
993}
994
995#if 0
996static int apm_get_battery_status(u_short which, u_short *status,
997 u_short *bat, u_short *life, u_short *nbat)
998{
999 u32 eax;
1000 u32 ebx;
1001 u32 ecx;
1002 u32 edx;
1003 u32 esi;
1004
1005 if (apm_info.connection_version < 0x0102) {
1006 /* pretend we only have one battery. */
1007 if (which != 1)
1008 return APM_BAD_DEVICE;
1009 *nbat = 1;
1010 return apm_get_power_status(status, bat, life);
1011 }
1012
1013 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1014 &ebx, &ecx, &edx, &esi))
1015 return (eax >> 8) & 0xff;
1016 *status = ebx;
1017 *bat = ecx;
1018 *life = edx;
1019 *nbat = esi;
1020 return APM_SUCCESS;
1021}
1022#endif
1023
1024/**
1025 * apm_engage_power_management - enable PM on a device
1026 * @device: identity of device
1027 * @enable: on/off
1028 *
1029 * Activate or deactive power management on either a specific device
1030 * or the entire system (%APM_DEVICE_ALL).
1031 */
1032
1033static int apm_engage_power_management(u_short device, int enable)
1034{
1035 u32 eax;
1036
1037 if ((enable == 0) && (device == APM_DEVICE_ALL)
1038 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1039 return APM_DISABLED;
1040 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax))
1041 return (eax >> 8) & 0xff;
1042 if (device == APM_DEVICE_ALL) {
1043 if (enable)
1044 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1045 else
1046 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1047 }
1048 return APM_SUCCESS;
1049}
1050
1051#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1052
1053/**
1054 * apm_console_blank - blank the display
1055 * @blank: on/off
1056 *
1057 * Attempt to blank the console, firstly by blanking just video device
1058 * zero, and if that fails (some BIOSes don't support it) then it blanks
1059 * all video devices. Typically the BIOS will do laptop backlight and
1060 * monitor powerdown for us.
1061 */
1062
1063static int apm_console_blank(int blank)
1064{
87af2ffd
AM		 1065 int error = APM_NOT_ENGAGED; /* silence gcc */
1066 int i;
3841b0a1
JC		 1067 u_short state;
1068 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1da177e4
LT		 1069
1070 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
3841b0a1
JC		 1071
1072 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1073 error = set_power_state(dev[i], state);
1074
1075 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1076 return 1;
1077
1078 if (error == APM_NOT_ENGAGED)
1079 break;
1da177e4 1080 }
3841b0a1 1081
73374454 1082 if (error == APM_NOT_ENGAGED) {
1da177e4
LT		 1083 static int tried;
1084 int eng_error;
1085 if (tried++ == 0) {
1086 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1087 if (eng_error) {
1088 apm_error("set display", error);
1089 apm_error("engage interface", eng_error);
1090 return 0;
1091 } else
1092 return apm_console_blank(blank);
1093 }
1094 }
1095 apm_error("set display", error);
1096 return 0;
1097}
1098#endif
1099
1100static int queue_empty(struct apm_user *as)
1101{
1102 return as->event_head == as->event_tail;
1103}
1104
1105static apm_event_t get_queued_event(struct apm_user *as)
1106{
87af2ffd
AM		 1107 if (++as->event_tail >= APM_MAX_EVENTS)
1108 as->event_tail = 0;
1da177e4
LT		 1109 return as->events[as->event_tail];
1110}
1111
1112static void queue_event(apm_event_t event, struct apm_user *sender)
1113{
1114 struct apm_user * as;
1115
1116 spin_lock(&user_list_lock);
1117 if (user_list == NULL)
1118 goto out;
1119 for (as = user_list; as != NULL; as = as->next) {
1120 if ((as == sender) || (!as->reader))
1121 continue;
87af2ffd
AM		 1122 if (++as->event_head >= APM_MAX_EVENTS)
1123 as->event_head = 0;
1124
1da177e4
LT		 1125 if (as->event_head == as->event_tail) {
1126 static int notified;
1127
1128 if (notified++ == 0)
1129 printk(KERN_ERR "apm: an event queue overflowed\n");
87af2ffd
AM		 1130 if (++as->event_tail >= APM_MAX_EVENTS)
1131 as->event_tail = 0;
1da177e4
LT		 1132 }
1133 as->events[as->event_head] = event;
1134 if ((!as->suser) || (!as->writer))
1135 continue;
1136 switch (event) {
1137 case APM_SYS_SUSPEND:
1138 case APM_USER_SUSPEND:
1139 as->suspends_pending++;
1140 suspends_pending++;
1141 break;
1142
1143 case APM_SYS_STANDBY:
1144 case APM_USER_STANDBY:
1145 as->standbys_pending++;
1146 standbys_pending++;
1147 break;
1148 }
1149 }
1150 wake_up_interruptible(&apm_waitqueue);
1151out:
1152 spin_unlock(&user_list_lock);
1153}
1154
1155static void set_time(void)
1156{
c7f40ff1 1157 struct timespec ts;
1da177e4 1158 if (got_clock_diff) { /* Must know time zone in order to set clock */
c7f40ff1 1159 ts.tv_sec = get_cmos_time() + clock_cmos_diff;
1160 ts.tv_nsec = 0;
1161 do_settimeofday(&ts);
1da177e4
LT		 1162 }
1163}
1164
1165static void get_time_diff(void)
1166{
1167#ifndef CONFIG_APM_RTC_IS_GMT
1168 /*
1169 * Estimate time zone so that set_time can update the clock
1170 */
1171 clock_cmos_diff = -get_cmos_time();
1172 clock_cmos_diff += get_seconds();
1173 got_clock_diff = 1;
1174#endif
1175}
1176
1177static void reinit_timer(void)
1178{
1179#ifdef INIT_TIMER_AFTER_SUSPEND
306e440d 1180 unsigned long flags;
1da177e4
LT		 1181
1182 spin_lock_irqsave(&i8253_lock, flags);
1183 /* set the clock to 100 Hz */
1184 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1185 udelay(10);
1186 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1187 udelay(10);
1188 outb(LATCH >> 8, PIT_CH0); /* MSB */
1189 udelay(10);
1190 spin_unlock_irqrestore(&i8253_lock, flags);
1191#endif
1192}
1193
1194static int suspend(int vetoable)
1195{
1196 int err;
1197 struct apm_user *as;
1198
1199 if (pm_send_all(PM_SUSPEND, (void *)3)) {
1200 /* Vetoed */
1201 if (vetoable) {
1202 if (apm_info.connection_version > 0x100)
1203 set_system_power_state(APM_STATE_REJECT);
1204 err = -EBUSY;
1205 ignore_sys_suspend = 0;
1206 printk(KERN_WARNING "apm: suspend was vetoed.\n");
1207 goto out;
1208 }
1209 printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
1210 }
1211
1212 device_suspend(PMSG_SUSPEND);
1213 local_irq_disable();
1214 device_power_down(PMSG_SUSPEND);
1215
1216 /* serialize with the timer interrupt */
1217 write_seqlock(&xtime_lock);
1218
1219 /* protect against access to timer chip registers */
1220 spin_lock(&i8253_lock);
1221
1222 get_time_diff();
1223 /*
1224 * Irq spinlock must be dropped around set_system_power_state.
1225 * We'll undo any timer changes due to interrupts below.
1226 */
1227 spin_unlock(&i8253_lock);
1228 write_sequnlock(&xtime_lock);
1229 local_irq_enable();
1230
1231 save_processor_state();
1232 err = set_system_power_state(APM_STATE_SUSPEND);
92c6dc59 1233 ignore_normal_resume = 1;
1da177e4
LT		 1234 restore_processor_state();
1235
1236 local_irq_disable();
1da177e4 1237 set_time();
c7f40ff1 1238 reinit_timer();
1da177e4
LT		 1239
1240 if (err == APM_NO_ERROR)
1241 err = APM_SUCCESS;
1242 if (err != APM_SUCCESS)
1243 apm_error("suspend", err);
1244 err = (err == APM_SUCCESS) ? 0 : -EIO;
1245 device_power_up();
1246 local_irq_enable();
1247 device_resume();
1248 pm_send_all(PM_RESUME, (void *)0);
1249 queue_event(APM_NORMAL_RESUME, NULL);
1250 out:
1251 spin_lock(&user_list_lock);
1252 for (as = user_list; as != NULL; as = as->next) {
1253 as->suspend_wait = 0;
1254 as->suspend_result = err;
1255 }
1256 spin_unlock(&user_list_lock);
1257 wake_up_interruptible(&apm_suspend_waitqueue);
1258 return err;
1259}
1260
1261static void standby(void)
1262{
1263 int err;
1264
1265 local_irq_disable();
1266 device_power_down(PMSG_SUSPEND);
1267 /* serialize with the timer interrupt */
1268 write_seqlock(&xtime_lock);
1269 /* If needed, notify drivers here */
1270 get_time_diff();
1271 write_sequnlock(&xtime_lock);
1272 local_irq_enable();
1273
1274 err = set_system_power_state(APM_STATE_STANDBY);
1275 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1276 apm_error("standby", err);
1277
1278 local_irq_disable();
1279 device_power_up();
1280 local_irq_enable();
1281}
1282
1283static apm_event_t get_event(void)
1284{
1285 int error;
87af2ffd 1286 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1da177e4
LT		 1287 apm_eventinfo_t info;
1288
1289 static int notified;
1290
1291 /* we don't use the eventinfo */
1292 error = apm_get_event(&event, &info);
1293 if (error == APM_SUCCESS)
1294 return event;
1295
1296 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1297 apm_error("get_event", error);
1298
1299 return 0;
1300}
1301
1302static void check_events(void)
1303{
1304 apm_event_t event;
1305 static unsigned long last_resume;
1306 static int ignore_bounce;
1307
1308 while ((event = get_event()) != 0) {
1309 if (debug) {
1310 if (event <= NR_APM_EVENT_NAME)
1311 printk(KERN_DEBUG "apm: received %s notify\n",
1312 apm_event_name[event - 1]);
1313 else
1314 printk(KERN_DEBUG "apm: received unknown "
1315 "event 0x%02x\n", event);
1316 }
1317 if (ignore_bounce
1318 && ((jiffies - last_resume) > bounce_interval))
1319 ignore_bounce = 0;
1320
1321 switch (event) {
1322 case APM_SYS_STANDBY:
1323 case APM_USER_STANDBY:
1324 queue_event(event, NULL);
1325 if (standbys_pending <= 0)
1326 standby();
1327 break;
1328
1329 case APM_USER_SUSPEND:
1330#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1331 if (apm_info.connection_version > 0x100)
1332 set_system_power_state(APM_STATE_REJECT);
1333 break;
1334#endif
1335 case APM_SYS_SUSPEND:
1336 if (ignore_bounce) {
1337 if (apm_info.connection_version > 0x100)
1338 set_system_power_state(APM_STATE_REJECT);
1339 break;
1340 }
1341 /*
1342 * If we are already processing a SUSPEND,
1343 * then further SUSPEND events from the BIOS
1344 * will be ignored. We also return here to
1345 * cope with the fact that the Thinkpads keep
1346 * sending a SUSPEND event until something else
1347 * happens!
1348 */
1349 if (ignore_sys_suspend)
1350 return;
1351 ignore_sys_suspend = 1;
1352 queue_event(event, NULL);
1353 if (suspends_pending <= 0)
1354 (void) suspend(1);
1355 break;
1356
1357 case APM_NORMAL_RESUME:
1358 case APM_CRITICAL_RESUME:
1359 case APM_STANDBY_RESUME:
1360 ignore_sys_suspend = 0;
1361 last_resume = jiffies;
1362 ignore_bounce = 1;
1363 if ((event != APM_NORMAL_RESUME)
1364 || (ignore_normal_resume == 0)) {
1da177e4 1365 set_time();
1da177e4
LT		 1366 device_resume();
1367 pm_send_all(PM_RESUME, (void *)0);
1368 queue_event(event, NULL);
1369 }
1370 ignore_normal_resume = 0;
1371 break;
1372
1373 case APM_CAPABILITY_CHANGE:
1374 case APM_LOW_BATTERY:
1375 case APM_POWER_STATUS_CHANGE:
1376 queue_event(event, NULL);
1377 /* If needed, notify drivers here */
1378 break;
1379
1380 case APM_UPDATE_TIME:
1da177e4 1381 set_time();
1da177e4
LT		 1382 break;
1383
1384 case APM_CRITICAL_SUSPEND:
1385 /*
1386 * We are not allowed to reject a critical suspend.
1387 */
1388 (void) suspend(0);
1389 break;
1390 }
1391 }
1392}
1393
1394static void apm_event_handler(void)
1395{
1396 static int pending_count = 4;
1397 int err;
1398
1399 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1400 if ((apm_info.connection_version > 0x100) &&
1401 (pending_count-- <= 0)) {
1402 pending_count = 4;
1403 if (debug)
1404 printk(KERN_DEBUG "apm: setting state busy\n");
1405 err = set_system_power_state(APM_STATE_BUSY);
1406 if (err)
1407 apm_error("busy", err);
1408 }
1409 } else
1410 pending_count = 4;
1411 check_events();
1412}
1413
1414/*
1415 * This is the APM thread main loop.
1416 */
1417
1418static void apm_mainloop(void)
1419{
1420 DECLARE_WAITQUEUE(wait, current);
1421
1422 add_wait_queue(&apm_waitqueue, &wait);
1423 set_current_state(TASK_INTERRUPTIBLE);
1424 for (;;) {
1425 schedule_timeout(APM_CHECK_TIMEOUT);
1426 if (exit_kapmd)
1427 break;
1428 /*
1429 * Ok, check all events, check for idle (and mark us sleeping
1430 * so as not to count towards the load average)..
1431 */
1432 set_current_state(TASK_INTERRUPTIBLE);
1433 apm_event_handler();
1434 }
1435 remove_wait_queue(&apm_waitqueue, &wait);
1436}
1437
1438static int check_apm_user(struct apm_user *as, const char *func)
1439{
1440 if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) {
1441 printk(KERN_ERR "apm: %s passed bad filp\n", func);
1442 return 1;
1443 }
1444 return 0;
1445}
1446
1447static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1448{
1449 struct apm_user * as;
1450 int i;
1451 apm_event_t event;
1452
1453 as = fp->private_data;
1454 if (check_apm_user(as, "read"))
1455 return -EIO;
1456 if ((int)count < sizeof(apm_event_t))
1457 return -EINVAL;
1458 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1459 return -EAGAIN;
1460 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1461 i = count;
1462 while ((i >= sizeof(event)) && !queue_empty(as)) {
1463 event = get_queued_event(as);
1464 if (copy_to_user(buf, &event, sizeof(event))) {
1465 if (i < count)
1466 break;
1467 return -EFAULT;
1468 }
1469 switch (event) {
1470 case APM_SYS_SUSPEND:
1471 case APM_USER_SUSPEND:
1472 as->suspends_read++;
1473 break;
1474
1475 case APM_SYS_STANDBY:
1476 case APM_USER_STANDBY:
1477 as->standbys_read++;
1478 break;
1479 }
1480 buf += sizeof(event);
1481 i -= sizeof(event);
1482 }
1483 if (i < count)
1484 return count - i;
1485 if (signal_pending(current))
1486 return -ERESTARTSYS;
1487 return 0;
1488}
1489
1490static unsigned int do_poll(struct file *fp, poll_table * wait)
1491{
1492 struct apm_user * as;
1493
1494 as = fp->private_data;
1495 if (check_apm_user(as, "poll"))
1496 return 0;
1497 poll_wait(fp, &apm_waitqueue, wait);
1498 if (!queue_empty(as))
1499 return POLLIN | POLLRDNORM;
1500 return 0;
1501}
1502
1503static int do_ioctl(struct inode * inode, struct file *filp,
1504 u_int cmd, u_long arg)
1505{
1506 struct apm_user * as;
1507
1508 as = filp->private_data;
1509 if (check_apm_user(as, "ioctl"))
1510 return -EIO;
1511 if ((!as->suser) || (!as->writer))
1512 return -EPERM;
1513 switch (cmd) {
1514 case APM_IOC_STANDBY:
1515 if (as->standbys_read > 0) {
1516 as->standbys_read--;
1517 as->standbys_pending--;
1518 standbys_pending--;
1519 } else
1520 queue_event(APM_USER_STANDBY, as);
1521 if (standbys_pending <= 0)
1522 standby();
1523 break;
1524 case APM_IOC_SUSPEND:
1525 if (as->suspends_read > 0) {
1526 as->suspends_read--;
1527 as->suspends_pending--;
1528 suspends_pending--;
1529 } else
1530 queue_event(APM_USER_SUSPEND, as);
1531 if (suspends_pending <= 0) {
1532 return suspend(1);
1533 } else {
1534 as->suspend_wait = 1;
1535 wait_event_interruptible(apm_suspend_waitqueue,
1536 as->suspend_wait == 0);
1537 return as->suspend_result;
1538 }
1539 break;
1540 default:
1541 return -EINVAL;
1542 }
1543 return 0;
1544}
1545
1546static int do_release(struct inode * inode, struct file * filp)
1547{
1548 struct apm_user * as;
1549
1550 as = filp->private_data;
1551 if (check_apm_user(as, "release"))
1552 return 0;
1553 filp->private_data = NULL;
1554 if (as->standbys_pending > 0) {
1555 standbys_pending -= as->standbys_pending;
1556 if (standbys_pending <= 0)
1557 standby();
1558 }
1559 if (as->suspends_pending > 0) {
1560 suspends_pending -= as->suspends_pending;
1561 if (suspends_pending <= 0)
1562 (void) suspend(1);
1563 }
1564 spin_lock(&user_list_lock);
1565 if (user_list == as)
1566 user_list = as->next;
1567 else {
1568 struct apm_user * as1;
1569
1570 for (as1 = user_list;
1571 (as1 != NULL) && (as1->next != as);
1572 as1 = as1->next)
1573 ;
1574 if (as1 == NULL)
1575 printk(KERN_ERR "apm: filp not in user list\n");
1576 else
1577 as1->next = as->next;
1578 }
1579 spin_unlock(&user_list_lock);
1580 kfree(as);
1581 return 0;
1582}
1583
1584static int do_open(struct inode * inode, struct file * filp)
1585{
1586 struct apm_user * as;
1587
1588 as = (struct apm_user *)kmalloc(sizeof(*as), GFP_KERNEL);
1589 if (as == NULL) {
1590 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1591 sizeof(*as));
1592 return -ENOMEM;
1593 }
1594 as->magic = APM_BIOS_MAGIC;
1595 as->event_tail = as->event_head = 0;
1596 as->suspends_pending = as->standbys_pending = 0;
1597 as->suspends_read = as->standbys_read = 0;
1598 /*
1599 * XXX - this is a tiny bit broken, when we consider BSD
1600 * process accounting. If the device is opened by root, we
1601 * instantly flag that we used superuser privs. Who knows,
1602 * we might close the device immediately without doing a
1603 * privileged operation -- cevans
1604 */
1605 as->suser = capable(CAP_SYS_ADMIN);
1606 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1607 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1608 spin_lock(&user_list_lock);
1609 as->next = user_list;
1610 user_list = as;
1611 spin_unlock(&user_list_lock);
1612 filp->private_data = as;
1613 return 0;
1614}
1615
1616static int apm_get_info(char *buf, char **start, off_t fpos, int length)
1617{
1618 char * p;
1619 unsigned short bx;
1620 unsigned short cx;
1621 unsigned short dx;
1622 int error;
1623 unsigned short ac_line_status = 0xff;
1624 unsigned short battery_status = 0xff;
1625 unsigned short battery_flag = 0xff;
1626 int percentage = -1;
1627 int time_units = -1;
1628 char *units = "?";
1629
1630 p = buf;
1631
1632 if ((num_online_cpus() == 1) &&
1633 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1634 ac_line_status = (bx >> 8) & 0xff;
1635 battery_status = bx & 0xff;
1636 if ((cx & 0xff) != 0xff)
1637 percentage = cx & 0xff;
1638
1639 if (apm_info.connection_version > 0x100) {
1640 battery_flag = (cx >> 8) & 0xff;
1641 if (dx != 0xffff) {
1642 units = (dx & 0x8000) ? "min" : "sec";
1643 time_units = dx & 0x7fff;
1644 }
1645 }
1646 }
1647 /* Arguments, with symbols from linux/apm_bios.h. Information is
1648 from the Get Power Status (0x0a) call unless otherwise noted.
1649
1650 0) Linux driver version (this will change if format changes)
1651 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1652 2) APM flags from APM Installation Check (0x00):
1653 bit 0: APM_16_BIT_SUPPORT
1654 bit 1: APM_32_BIT_SUPPORT
1655 bit 2: APM_IDLE_SLOWS_CLOCK
1656 bit 3: APM_BIOS_DISABLED
1657 bit 4: APM_BIOS_DISENGAGED
1658 3) AC line status
1659 0x00: Off-line
1660 0x01: On-line
1661 0x02: On backup power (BIOS >= 1.1 only)
1662 0xff: Unknown
1663 4) Battery status
1664 0x00: High
1665 0x01: Low
1666 0x02: Critical
1667 0x03: Charging
1668 0x04: Selected battery not present (BIOS >= 1.2 only)
1669 0xff: Unknown
1670 5) Battery flag
1671 bit 0: High
1672 bit 1: Low
1673 bit 2: Critical
1674 bit 3: Charging
1675 bit 7: No system battery
1676 0xff: Unknown
1677 6) Remaining battery life (percentage of charge):
1678 0-100: valid
1679 -1: Unknown
1680 7) Remaining battery life (time units):
1681 Number of remaining minutes or seconds
1682 -1: Unknown
1683 8) min = minutes; sec = seconds */
1684
1685 p += sprintf(p, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1686 driver_version,
1687 (apm_info.bios.version >> 8) & 0xff,
1688 apm_info.bios.version & 0xff,
1689 apm_info.bios.flags,
1690 ac_line_status,
1691 battery_status,
1692 battery_flag,
1693 percentage,
1694 time_units,
1695 units);
1696
1697 return p - buf;
1698}
1699
1700static int apm(void *unused)
1701{
1702 unsigned short bx;
1703 unsigned short cx;
1704 unsigned short dx;
1705 int error;
1706 char * power_stat;
1707 char * bat_stat;
1708
1709 kapmd_running = 1;
1710
1711 daemonize("kapmd");
1712
1713 current->flags |= PF_NOFREEZE;
1714
1715#ifdef CONFIG_SMP
1716 /* 2002/08/01 - WT
1717 * This is to avoid random crashes at boot time during initialization
1718 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1719 * Some bioses don't like being called from CPU != 0.
1720 * Method suggested by Ingo Molnar.
1721 */
1722 set_cpus_allowed(current, cpumask_of_cpu(0));
1723 BUG_ON(smp_processor_id() != 0);
1724#endif
1725
1726 if (apm_info.connection_version == 0) {
1727 apm_info.connection_version = apm_info.bios.version;
1728 if (apm_info.connection_version > 0x100) {
1729 /*
1730 * We only support BIOSs up to version 1.2
1731 */
1732 if (apm_info.connection_version > 0x0102)
1733 apm_info.connection_version = 0x0102;
1734 error = apm_driver_version(&apm_info.connection_version);
1735 if (error != APM_SUCCESS) {
1736 apm_error("driver version", error);
1737 /* Fall back to an APM 1.0 connection. */
1738 apm_info.connection_version = 0x100;
1739 }
1740 }
1741 }
1742
1743 if (debug)
1744 printk(KERN_INFO "apm: Connection version %d.%d\n",
1745 (apm_info.connection_version >> 8) & 0xff,
1746 apm_info.connection_version & 0xff);
1747
1748#ifdef CONFIG_APM_DO_ENABLE
1749 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1750 /*
1751 * This call causes my NEC UltraLite Versa 33/C to hang if it
1752 * is booted with PM disabled but not in the docking station.
1753 * Unfortunate ...
1754 */
1755 error = apm_enable_power_management(1);
1756 if (error) {
1757 apm_error("enable power management", error);
1758 return -1;
1759 }
1760 }
1761#endif
1762
1763 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1764 && (apm_info.connection_version > 0x0100)) {
1765 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1766 if (error) {
1767 apm_error("engage power management", error);
1768 return -1;
1769 }
1770 }
1771
1772 if (debug && (num_online_cpus() == 1 || smp )) {
1773 error = apm_get_power_status(&bx, &cx, &dx);
1774 if (error)
1775 printk(KERN_INFO "apm: power status not available\n");
1776 else {
1777 switch ((bx >> 8) & 0xff) {
1778 case 0: power_stat = "off line"; break;
1779 case 1: power_stat = "on line"; break;
1780 case 2: power_stat = "on backup power"; break;
1781 default: power_stat = "unknown"; break;
1782 }
1783 switch (bx & 0xff) {
1784 case 0: bat_stat = "high"; break;
1785 case 1: bat_stat = "low"; break;
1786 case 2: bat_stat = "critical"; break;
1787 case 3: bat_stat = "charging"; break;
1788 default: bat_stat = "unknown"; break;
1789 }
1790 printk(KERN_INFO
1791 "apm: AC %s, battery status %s, battery life ",
1792 power_stat, bat_stat);
1793 if ((cx & 0xff) == 0xff)
1794 printk("unknown\n");
1795 else
1796 printk("%d%%\n", cx & 0xff);
1797 if (apm_info.connection_version > 0x100) {
1798 printk(KERN_INFO
1799 "apm: battery flag 0x%02x, battery life ",
1800 (cx >> 8) & 0xff);
1801 if (dx == 0xffff)
1802 printk("unknown\n");
1803 else
1804 printk("%d %s\n", dx & 0x7fff,
1805 (dx & 0x8000) ?
1806 "minutes" : "seconds");
1807 }
1808 }
1809 }
1810
1811 /* Install our power off handler.. */
1812 if (power_off)
1813 pm_power_off = apm_power_off;
1814
1815 if (num_online_cpus() == 1 || smp) {
1816#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1817 console_blank_hook = apm_console_blank;
1818#endif
1819 apm_mainloop();
1820#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1821 console_blank_hook = NULL;
1822#endif
1823 }
1824 kapmd_running = 0;
1825
1826 return 0;
1827}
1828
1829#ifndef MODULE
1830static int __init apm_setup(char *str)
1831{
1832 int invert;
1833
1834 while ((str != NULL) && (*str != '\0')) {
1835 if (strncmp(str, "off", 3) == 0)
1836 apm_disabled = 1;
1837 if (strncmp(str, "on", 2) == 0)
1838 apm_disabled = 0;
1839 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1840 (strncmp(str, "bounce_interval=", 16) == 0))
1841 bounce_interval = simple_strtol(str + 16, NULL, 0);
1842 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1843 (strncmp(str, "idle_threshold=", 15) == 0))
1844 idle_threshold = simple_strtol(str + 15, NULL, 0);
1845 if ((strncmp(str, "idle-period=", 12) == 0) ||
1846 (strncmp(str, "idle_period=", 12) == 0))
1847 idle_period = simple_strtol(str + 12, NULL, 0);
1848 invert = (strncmp(str, "no-", 3) == 0) ||
1849 (strncmp(str, "no_", 3) == 0);
1850 if (invert)
1851 str += 3;
1852 if (strncmp(str, "debug", 5) == 0)
1853 debug = !invert;
1854 if ((strncmp(str, "power-off", 9) == 0) ||
1855 (strncmp(str, "power_off", 9) == 0))
1856 power_off = !invert;
1857 if (strncmp(str, "smp", 3) == 0)
1858 {
1859 smp = !invert;
1860 idle_threshold = 100;
1861 }
1862 if ((strncmp(str, "allow-ints", 10) == 0) ||
1863 (strncmp(str, "allow_ints", 10) == 0))
1864 apm_info.allow_ints = !invert;
1865 if ((strncmp(str, "broken-psr", 10) == 0) ||
1866 (strncmp(str, "broken_psr", 10) == 0))
1867 apm_info.get_power_status_broken = !invert;
1868 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1869 (strncmp(str, "realmode_power_off", 18) == 0))
1870 apm_info.realmode_power_off = !invert;
1871 str = strchr(str, ',');
1872 if (str != NULL)
1873 str += strspn(str, ", \t");
1874 }
1875 return 1;
1876}
1877
1878__setup("apm=", apm_setup);
1879#endif
1880
1881static struct file_operations apm_bios_fops = {
1882 .owner = THIS_MODULE,
1883 .read = do_read,
1884 .poll = do_poll,
1885 .ioctl = do_ioctl,
1886 .open = do_open,
1887 .release = do_release,
1888};
1889
1890static struct miscdevice apm_device = {
1891 APM_MINOR_DEV,
1892 "apm_bios",
1893 &apm_bios_fops
1894};
1895
1896
1897/* Simple "print if true" callback */
1898static int __init print_if_true(struct dmi_system_id *d)
1899{
1900 printk("%s\n", d->ident);
1901 return 0;
1902}
1903
1904/*
1905 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1906 * disabled before the suspend. Linux used to get terribly confused by that.
1907 */
1908static int __init broken_ps2_resume(struct dmi_system_id *d)
1909{
1910 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug workaround hopefully not needed.\n", d->ident);
1911 return 0;
1912}
1913
1914/* Some bioses have a broken protected mode poweroff and need to use realmode */
1915static int __init set_realmode_power_off(struct dmi_system_id *d)
1916{
1917 if (apm_info.realmode_power_off == 0) {
1918 apm_info.realmode_power_off = 1;
1919 printk(KERN_INFO "%s bios detected. Using realmode poweroff only.\n", d->ident);
1920 }
1921 return 0;
1922}
1923
1924/* Some laptops require interrupts to be enabled during APM calls */
1925static int __init set_apm_ints(struct dmi_system_id *d)
1926{
1927 if (apm_info.allow_ints == 0) {
1928 apm_info.allow_ints = 1;
1929 printk(KERN_INFO "%s machine detected. Enabling interrupts during APM calls.\n", d->ident);
1930 }
1931 return 0;
1932}
1933
1934/* Some APM bioses corrupt memory or just plain do not work */
1935static int __init apm_is_horked(struct dmi_system_id *d)
1936{
1937 if (apm_info.disabled == 0) {
1938 apm_info.disabled = 1;
1939 printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
1940 }
1941 return 0;
1942}
1943
1944static int __init apm_is_horked_d850md(struct dmi_system_id *d)
1945{
1946 if (apm_info.disabled == 0) {
1947 apm_info.disabled = 1;
1948 printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
1949 printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n");
1950 printk(KERN_INFO "download from support.intel.com \n");
1951 }
1952 return 0;
1953}
1954
1955/* Some APM bioses hang on APM idle calls */
1956static int __init apm_likes_to_melt(struct dmi_system_id *d)
1957{
1958 if (apm_info.forbid_idle == 0) {
1959 apm_info.forbid_idle = 1;
1960 printk(KERN_INFO "%s machine detected. Disabling APM idle calls.\n", d->ident);
1961 }
1962 return 0;
1963}
1964
1965/*
1966 * Check for clue free BIOS implementations who use
1967 * the following QA technique
1968 *
1969 * [ Write BIOS Code ]<------
1970 * | ^
1971 * < Does it Compile >----N--
1972 * |Y ^
1973 * < Does it Boot Win98 >-N--
1974 * |Y
1975 * [Ship It]
1976 *
1977 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
1978 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
1979 */
1980static int __init broken_apm_power(struct dmi_system_id *d)
1981{
1982 apm_info.get_power_status_broken = 1;
1983 printk(KERN_WARNING "BIOS strings suggest APM bugs, disabling power status reporting.\n");
1984 return 0;
1985}
1986
1987/*
1988 * This bios swaps the APM minute reporting bytes over (Many sony laptops
1989 * have this problem).
1990 */
1991static int __init swab_apm_power_in_minutes(struct dmi_system_id *d)
1992{
1993 apm_info.get_power_status_swabinminutes = 1;
1994 printk(KERN_WARNING "BIOS strings suggest APM reports battery life in minutes and wrong byte order.\n");
1995 return 0;
1996}
1997
1998static struct dmi_system_id __initdata apm_dmi_table[] = {
1999 {
2000 print_if_true,
2001 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2002 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2003 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2004 },
2005 { /* Handle problems with APM on the C600 */
2006 broken_ps2_resume, "Dell Latitude C600",
2007 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2008 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2009 },
2010 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2011 set_apm_ints, "Dell Latitude",
2012 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2013 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2014 },
2015 { /* APM crashes */
2016 apm_is_horked, "Dell Inspiron 2500",
2017 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2018 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2019 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
2020 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2021 },
2022 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2023 set_apm_ints, "Dell Inspiron", {
2024 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2025 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2026 },
2027 { /* Handle problems with APM on Inspiron 5000e */
2028 broken_apm_power, "Dell Inspiron 5000e",
2029 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2030 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2031 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2032 },
2033 { /* Handle problems with APM on Inspiron 2500 */
2034 broken_apm_power, "Dell Inspiron 2500",
2035 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2036 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2037 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2038 },
2039 { /* APM crashes */
2040 apm_is_horked, "Dell Dimension 4100",
2041 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2042 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2043 DMI_MATCH(DMI_BIOS_VENDOR,"Intel Corp."),
2044 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2045 },
2046 { /* Allow interrupts during suspend on Compaq Laptops*/
2047 set_apm_ints, "Compaq 12XL125",
2048 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2049 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2050 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2051 DMI_MATCH(DMI_BIOS_VERSION,"4.06"), },
2052 },
2053 { /* Allow interrupts during APM or the clock goes slow */
2054 set_apm_ints, "ASUSTeK",
2055 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2056 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2057 },
2058 { /* APM blows on shutdown */
2059 apm_is_horked, "ABIT KX7-333[R]",
2060 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2061 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2062 },
2063 { /* APM crashes */
2064 apm_is_horked, "Trigem Delhi3",
2065 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2066 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2067 },
2068 { /* APM crashes */
2069 apm_is_horked, "Fujitsu-Siemens",
2070 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2071 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2072 },
2073 { /* APM crashes */
2074 apm_is_horked_d850md, "Intel D850MD",
2075 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2076 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2077 },
2078 { /* APM crashes */
2079 apm_is_horked, "Intel D810EMO",
2080 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2081 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2082 },
2083 { /* APM crashes */
2084 apm_is_horked, "Dell XPS-Z",
2085 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2086 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2087 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2088 },
2089 { /* APM crashes */
2090 apm_is_horked, "Sharp PC-PJ/AX",
2091 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2092 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2093 DMI_MATCH(DMI_BIOS_VENDOR,"SystemSoft"),
2094 DMI_MATCH(DMI_BIOS_VERSION,"Version R2.08"), },
2095 },
2096 { /* APM crashes */
2097 apm_is_horked, "Dell Inspiron 2500",
2098 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2099 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2100 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
2101 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2102 },
2103 { /* APM idle hangs */
2104 apm_likes_to_melt, "Jabil AMD",
2105 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2106 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2107 },
2108 { /* APM idle hangs */
2109 apm_likes_to_melt, "AMI Bios",
2110 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2111 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2112 },
2113 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2114 swab_apm_power_in_minutes, "Sony VAIO",
2115 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2116 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2117 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2118 },
2119 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2120 swab_apm_power_in_minutes, "Sony VAIO",
2121 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2122 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2123 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2124 },
2125 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2126 swab_apm_power_in_minutes, "Sony VAIO",
2127 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2128 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2129 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2130 },
2131 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2132 swab_apm_power_in_minutes, "Sony VAIO",
2133 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2134 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2135 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2136 },
2137 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2138 swab_apm_power_in_minutes, "Sony VAIO",
2139 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2140 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2141 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2142 },
2143 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2144 swab_apm_power_in_minutes, "Sony VAIO",
2145 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2146 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2147 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2148 },
2149 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2150 swab_apm_power_in_minutes, "Sony VAIO",
2151 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2152 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2153 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2154 },
2155 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2156 swab_apm_power_in_minutes, "Sony VAIO",
2157 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2158 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2159 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2160 },
2161 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2162 swab_apm_power_in_minutes, "Sony VAIO",
2163 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2164 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2165 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2166 },
2167 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2168 swab_apm_power_in_minutes, "Sony VAIO",
2169 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2170 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2171 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2172 },
2173
2174 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2175 swab_apm_power_in_minutes, "Sony VAIO",
2176 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2177 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2178 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2179 },
2180 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2181 swab_apm_power_in_minutes, "Sony VAIO",
2182 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2183 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2184 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2185 },
2186 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2187 swab_apm_power_in_minutes, "Sony VAIO",
2188 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2189 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2190 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2191 },
2192 { /* broken PM poweroff bios */
2193 set_realmode_power_off, "Award Software v4.60 PGMA",
2194 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2195 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2196 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2197 },
2198
2199 /* Generic per vendor APM settings */
2200
2201 { /* Allow interrupts during suspend on IBM laptops */
2202 set_apm_ints, "IBM",
2203 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2204 },
2205
2206 { }
2207};
2208
2209/*
2210 * Just start the APM thread. We do NOT want to do APM BIOS
2211 * calls from anything but the APM thread, if for no other reason
2212 * than the fact that we don't trust the APM BIOS. This way,
2213 * most common APM BIOS problems that lead to protection errors
2214 * etc will have at least some level of being contained...
2215 *
2216 * In short, if something bad happens, at least we have a choice
2217 * of just killing the apm thread..
2218 */
2219static int __init apm_init(void)
2220{
2221 struct proc_dir_entry *apm_proc;
92f17f01 2222 struct desc_struct *gdt;
1da177e4 2223 int ret;
1da177e4
LT		 2224
2225 dmi_check_system(apm_dmi_table);
2226
2227 if (apm_info.bios.version == 0) {
2228 printk(KERN_INFO "apm: BIOS not found.\n");
2229 return -ENODEV;
2230 }
2231 printk(KERN_INFO
2232 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2233 ((apm_info.bios.version >> 8) & 0xff),
2234 (apm_info.bios.version & 0xff),
2235 apm_info.bios.flags,
2236 driver_version);
2237 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2238 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2239 return -ENODEV;
2240 }
2241
2242 if (allow_ints)
2243 apm_info.allow_ints = 1;
2244 if (broken_psr)
2245 apm_info.get_power_status_broken = 1;
2246 if (realmode_power_off)
2247 apm_info.realmode_power_off = 1;
2248 /* User can override, but default is to trust DMI */
2249 if (apm_disabled != -1)
2250 apm_info.disabled = apm_disabled;
2251
2252 /*
2253 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2254 * but is reportedly a 1.0 BIOS.
2255 */
2256 if (apm_info.bios.version == 0x001)
2257 apm_info.bios.version = 0x100;
2258
2259 /* BIOS < 1.2 doesn't set cseg_16_len */
2260 if (apm_info.bios.version < 0x102)
2261 apm_info.bios.cseg_16_len = 0; /* 64k */
2262
2263 if (debug) {
2264 printk(KERN_INFO "apm: entry %x:%lx cseg16 %x dseg %x",
2265 apm_info.bios.cseg, apm_info.bios.offset,
2266 apm_info.bios.cseg_16, apm_info.bios.dseg);
2267 if (apm_info.bios.version > 0x100)
2268 printk(" cseg len %x, dseg len %x",
2269 apm_info.bios.cseg_len,
2270 apm_info.bios.dseg_len);
2271 if (apm_info.bios.version > 0x101)
2272 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2273 printk("\n");
2274 }
2275
2276 if (apm_info.disabled) {
2277 printk(KERN_NOTICE "apm: disabled on user request.\n");
2278 return -ENODEV;
2279 }
2280 if ((num_online_cpus() > 1) && !power_off && !smp) {
2281 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2282 apm_info.disabled = 1;
2283 return -ENODEV;
2284 }
2285 if (PM_IS_ACTIVE()) {
2286 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2287 apm_info.disabled = 1;
2288 return -ENODEV;
2289 }
987d4613 2290#ifdef CONFIG_PM_LEGACY
1da177e4 2291 pm_active = 1;
987d4613 2292#endif
1da177e4
LT		 2293
2294 /*
2295 * Set up a segment that references the real mode segment 0x40
2296 * that extends up to the end of page zero (that we have reserved).
2297 * This is for buggy BIOS's that refer to (real mode) segment 0x40
2298 * even though they are called in protected mode.
2299 */
2300 set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
2301 _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
2302
3012d2d2
ZA		 2303 /*
2304 * Set up the long jump entry point to the APM BIOS, which is called
2305 * from inline assembly.
2306 */
1da177e4
LT		 2307 apm_bios_entry.offset = apm_info.bios.offset;
2308 apm_bios_entry.segment = APM_CS;
2309
3012d2d2
ZA		 2310 /*
2311 * The APM 1.1 BIOS is supposed to provide limit information that it
2312 * recognizes. Many machines do this correctly, but many others do
2313 * not restrict themselves to their claimed limit. When this happens,
2314 * they will cause a segmentation violation in the kernel at boot time.
2315 * Most BIOS's, however, will respect a 64k limit, so we use that.
92f17f01
ZA		 2316 *
2317 * Note we only set APM segments on CPU zero, since we pin the APM
2318 * code to that CPU.
3012d2d2 2319 */
92f17f01
ZA		 2320 gdt = get_cpu_gdt_table(0);
2321 set_base(gdt[APM_CS >> 3],
2322 __va((unsigned long)apm_info.bios.cseg << 4));
2323 set_base(gdt[APM_CS_16 >> 3],
2324 __va((unsigned long)apm_info.bios.cseg_16 << 4));
2325 set_base(gdt[APM_DS >> 3],
2326 __va((unsigned long)apm_info.bios.dseg << 4));
1da177e4
LT		 2327
2328 apm_proc = create_proc_info_entry("apm", 0, NULL, apm_get_info);
2329 if (apm_proc)
2330 apm_proc->owner = THIS_MODULE;
2331
2332 ret = kernel_thread(apm, NULL, CLONE_KERNEL | SIGCHLD);
2333 if (ret < 0) {
2334 printk(KERN_ERR "apm: disabled - Unable to start kernel thread.\n");
c94a62aa 2335 remove_proc_entry("apm", NULL);
1da177e4
LT		 2336 return -ENOMEM;
2337 }
2338
2339 if (num_online_cpus() > 1 && !smp ) {
2340 printk(KERN_NOTICE
2341 "apm: disabled - APM is not SMP safe (power off active).\n");
2342 return 0;
2343 }
2344
c94a62aa
NH		 2345 /*
2346 * Note we don't actually care if the misc_device cannot be registered.
2347 * this driver can do its job without it, even if userspace can't
2348 * control it. just log the error
2349 */
2350 if (misc_register(&apm_device))
2351 printk(KERN_WARNING "apm: Could not register misc device.\n");
1da177e4
LT		 2352
2353 if (HZ != 100)
2354 idle_period = (idle_period * HZ) / 100;
2355 if (idle_threshold < 100) {
2356 original_pm_idle = pm_idle;
2357 pm_idle = apm_cpu_idle;
2358 set_pm_idle = 1;
2359 }
2360
2361 return 0;
2362}
2363
2364static void __exit apm_exit(void)
2365{
2366 int error;
2367
2368 if (set_pm_idle) {
2369 pm_idle = original_pm_idle;
2370 /*
2371 * We are about to unload the current idle thread pm callback
2372 * (pm_idle), Wait for all processors to update cached/local
2373 * copies of pm_idle before proceeding.
2374 */
2375 cpu_idle_wait();
2376 }
2377 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2378 && (apm_info.connection_version > 0x0100)) {
2379 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2380 if (error)
2381 apm_error("disengage power management", error);
2382 }
2383 misc_deregister(&apm_device);
2384 remove_proc_entry("apm", NULL);
2385 if (power_off)
2386 pm_power_off = NULL;
2387 exit_kapmd = 1;
2388 while (kapmd_running)
2389 schedule();
987d4613 2390#ifdef CONFIG_PM_LEGACY
1da177e4 2391 pm_active = 0;
987d4613 2392#endif
1da177e4
LT		 2393}
2394
2395module_init(apm_init);
2396module_exit(apm_exit);
2397
2398MODULE_AUTHOR("Stephen Rothwell");
2399MODULE_DESCRIPTION("Advanced Power Management");
2400MODULE_LICENSE("GPL");
2401module_param(debug, bool, 0644);
2402MODULE_PARM_DESC(debug, "Enable debug mode");
2403module_param(power_off, bool, 0444);
2404MODULE_PARM_DESC(power_off, "Enable power off");
2405module_param(bounce_interval, int, 0444);
2406MODULE_PARM_DESC(bounce_interval,
2407 "Set the number of ticks to ignore suspend bounces");
2408module_param(allow_ints, bool, 0444);
2409MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2410module_param(broken_psr, bool, 0444);
2411MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2412module_param(realmode_power_off, bool, 0444);
2413MODULE_PARM_DESC(realmode_power_off,
2414 "Switch to real mode before powering off");
2415module_param(idle_threshold, int, 0444);
2416MODULE_PARM_DESC(idle_threshold,
2417 "System idle percentage above which to make APM BIOS idle calls");
2418module_param(idle_period, int, 0444);
2419MODULE_PARM_DESC(idle_period,
2420 "Period (in sec/100) over which to caculate the idle percentage");
2421module_param(smp, bool, 0444);
2422MODULE_PARM_DESC(smp,
2423 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2424MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
Linux 6.x block layer and io_uring tree(s)