2 * APM BIOS driver for Linux
3 * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
5 * Initial development of this driver was funded by NEC Australia P/L
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
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.
18 * October 1995, Rik Faith (faith@cs.unc.edu):
19 * Minor enhancements and updates (to the patch set) for 1.3.x
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)
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
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,
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 replacement 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
69 * 1.6: Cope with compiler/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>
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
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
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.
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@ucw.cz>
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@lxorguk.ukuu.org.uk>).
164 * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
165 * calling it - instead idle. (Alan Cox <alan@lxorguk.ukuu.org.uk>)
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.
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.
191 * [This document is available free from Intel by calling 800.628.8686 (fax
192 * 916.356.6100) or 800.548.4725; or from
193 * http://www.microsoft.com/whdc/archive/amp_12.mspx It is also
194 * available from Microsoft by calling 206.882.8080.]
197 * Intel Corporation, Microsoft Corporation. Advanced Power Management
198 * (APM) BIOS Interface Specification, Revision 1.2, February 1996.
200 * [This document is available from Microsoft at:
201 * http://www.microsoft.com/whdc/archive/amp_12.mspx]
204 #define pr_fmt(fmt) "apm: " fmt
206 #include <linux/module.h>
208 #include <linux/poll.h>
209 #include <linux/types.h>
210 #include <linux/stddef.h>
211 #include <linux/timer.h>
212 #include <linux/fcntl.h>
213 #include <linux/slab.h>
214 #include <linux/stat.h>
215 #include <linux/proc_fs.h>
216 #include <linux/seq_file.h>
217 #include <linux/miscdevice.h>
218 #include <linux/apm_bios.h>
219 #include <linux/init.h>
220 #include <linux/time.h>
221 #include <linux/sched.h>
222 #include <linux/pm.h>
223 #include <linux/capability.h>
224 #include <linux/device.h>
225 #include <linux/kernel.h>
226 #include <linux/freezer.h>
227 #include <linux/smp.h>
228 #include <linux/dmi.h>
229 #include <linux/suspend.h>
230 #include <linux/kthread.h>
231 #include <linux/jiffies.h>
232 #include <linux/acpi.h>
233 #include <linux/syscore_ops.h>
234 #include <linux/i8253.h>
235 #include <linux/cpuidle.h>
237 #include <asm/uaccess.h>
238 #include <asm/desc.h>
239 #include <asm/olpc.h>
240 #include <asm/paravirt.h>
241 #include <asm/reboot.h>
243 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
244 extern int (*console_blank_hook)(int);
248 * The apm_bios device is one of the misc char devices.
249 * This is its minor number.
251 #define APM_MINOR_DEV 134
254 * Various options can be changed at boot time as follows:
255 * (We allow underscores for compatibility with the modules code)
256 * apm=on/off enable/disable APM
257 * [no-]allow[-_]ints allow interrupts during BIOS calls
258 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
259 * [no-]realmode[-_]power[-_]off switch to real mode before
261 * [no-]debug log some debugging messages
262 * [no-]power[-_]off power off on shutdown
263 * [no-]smp Use apm even on an SMP box
264 * bounce[-_]interval=<n> number of ticks to ignore suspend
266 * idle[-_]threshold=<n> System idle percentage above which to
267 * make APM BIOS idle calls. Set it to
269 * idle[-_]period=<n> Period (in 1/100s of a second) over
270 * which the idle percentage is
274 /* KNOWN PROBLEM MACHINES:
276 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
277 * [Confirmed by TI representative]
278 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
279 * [Confirmed by BIOS disassembly]
280 * [This may work now ...]
281 * P: Toshiba 1950S: battery life information only gets updated after resume
282 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
283 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
284 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
285 * Neale Banks <neale@lowendale.com.au> December 2000
287 * Legend: U = unusable with APM patches
288 * P = partially usable with APM patches
292 * Define as 1 to make the driver always call the APM BIOS busy
293 * routine even if the clock was not reported as slowed by the
294 * idle routine. Otherwise, define as 0.
296 #define ALWAYS_CALL_BUSY 1
299 * Define to make the APM BIOS calls zero all data segment registers (so
300 * that an incorrect BIOS implementation will cause a kernel panic if it
301 * tries to write to arbitrary memory).
303 #define APM_ZERO_SEGS
308 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
309 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
310 * David Chen <chen@ctpa04.mit.edu>
312 #undef INIT_TIMER_AFTER_SUSPEND
314 #ifdef INIT_TIMER_AFTER_SUSPEND
315 #include <linux/timex.h>
317 #include <linux/delay.h>
321 * Need to poll the APM BIOS every second
323 #define APM_CHECK_TIMEOUT (HZ)
326 * Ignore suspend events for this amount of time after a resume
328 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
331 * Maximum number of events stored
333 #define APM_MAX_EVENTS 20
336 * The per-file APM data
340 struct apm_user *next;
341 unsigned int suser: 1;
342 unsigned int writer: 1;
343 unsigned int reader: 1;
344 unsigned int suspend_wait: 1;
346 int suspends_pending;
347 int standbys_pending;
352 apm_event_t events[APM_MAX_EVENTS];
356 * The magic number in apm_user
358 #define APM_BIOS_MAGIC 0x4101
361 * idle percentage above which bios idle calls are done
363 #ifdef CONFIG_APM_CPU_IDLE
364 #define DEFAULT_IDLE_THRESHOLD 95
366 #define DEFAULT_IDLE_THRESHOLD 100
368 #define DEFAULT_IDLE_PERIOD (100 / 3)
370 static int apm_cpu_idle(struct cpuidle_device *dev,
371 struct cpuidle_driver *drv, int index);
373 static struct cpuidle_driver apm_idle_driver = {
375 .owner = THIS_MODULE,
377 { /* entry 0 is for polling */ },
378 { /* entry 1 is for APM idle */
381 .flags = CPUIDLE_FLAG_TIME_VALID,
382 .exit_latency = 250, /* WAG */
383 .target_residency = 500, /* WAG */
384 .enter = &apm_cpu_idle
390 static struct cpuidle_device apm_cpuidle_device;
396 unsigned long offset;
397 unsigned short segment;
399 static int clock_slowed;
400 static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
401 static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
402 static int suspends_pending;
403 static int standbys_pending;
404 static int ignore_sys_suspend;
405 static int ignore_normal_resume;
406 static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
408 static bool debug __read_mostly;
409 static bool smp __read_mostly;
410 static int apm_disabled = -1;
412 static bool power_off;
414 static bool power_off = 1;
416 static bool realmode_power_off;
417 #ifdef CONFIG_APM_ALLOW_INTS
418 static bool allow_ints = 1;
420 static bool allow_ints;
422 static bool broken_psr;
424 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
425 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
426 static struct apm_user *user_list;
427 static DEFINE_SPINLOCK(user_list_lock);
428 static DEFINE_MUTEX(apm_mutex);
431 * Set up a segment that references the real mode segment 0x40
432 * that extends up to the end of page zero (that we have reserved).
433 * This is for buggy BIOS's that refer to (real mode) segment 0x40
434 * even though they are called in protected mode.
436 static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
437 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
439 static const char driver_version[] = "1.16ac"; /* no spaces */
441 static struct task_struct *kapmd_task;
444 * APM event names taken from the APM 1.2 specification. These are
445 * the message codes that the BIOS uses to tell us about events
447 static const char * const apm_event_name[] = {
453 "power status change",
458 "system standby resume",
459 "capabilities change"
461 #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
463 typedef struct lookup_t {
469 * The BIOS returns a set of standard error codes in AX when the
473 static const lookup_t error_table[] = {
474 /* N/A { APM_SUCCESS, "Operation succeeded" }, */
475 { APM_DISABLED, "Power management disabled" },
476 { APM_CONNECTED, "Real mode interface already connected" },
477 { APM_NOT_CONNECTED, "Interface not connected" },
478 { APM_16_CONNECTED, "16 bit interface already connected" },
479 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
480 { APM_32_CONNECTED, "32 bit interface already connected" },
481 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
482 { APM_BAD_DEVICE, "Unrecognized device ID" },
483 { APM_BAD_PARAM, "Parameter out of range" },
484 { APM_NOT_ENGAGED, "Interface not engaged" },
485 { APM_BAD_FUNCTION, "Function not supported" },
486 { APM_RESUME_DISABLED, "Resume timer disabled" },
487 { APM_BAD_STATE, "Unable to enter requested state" },
488 /* N/A { APM_NO_EVENTS, "No events pending" }, */
489 { APM_NO_ERROR, "BIOS did not set a return code" },
490 { APM_NOT_PRESENT, "No APM present" }
492 #define ERROR_COUNT ARRAY_SIZE(error_table)
495 * apm_error - display an APM error
496 * @str: information string
497 * @err: APM BIOS return code
499 * Write a meaningful log entry to the kernel log in the event of
500 * an APM error. Note that this also handles (negative) kernel errors.
503 static void apm_error(char *str, int err)
507 for (i = 0; i < ERROR_COUNT; i++)
508 if (error_table[i].key == err)
511 pr_notice("%s: %s\n", str, error_table[i].msg);
513 pr_notice("%s: linux error code %i\n", str, err);
515 pr_notice("%s: unknown error code %#2.2x\n",
520 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
521 * apm_info.allow_ints, we are being really paranoid here! Not only
522 * are interrupts disabled, but all the segment registers (except SS)
523 * are saved and zeroed this means that if the BIOS tries to reference
524 * any data without explicitly loading the segment registers, the kernel
525 * will fault immediately rather than have some unforeseen circumstances
526 * for the rest of the kernel. And it will be very obvious! :-) Doing
527 * this depends on CS referring to the same physical memory as DS so that
528 * DS can be zeroed before the call. Unfortunately, we can't do anything
529 * about the stack segment/pointer. Also, we tell the compiler that
530 * everything could change.
532 * Also, we KNOW that for the non error case of apm_bios_call, there
533 * is no useful data returned in the low order 8 bits of eax.
536 static inline unsigned long __apm_irq_save(void)
539 local_save_flags(flags);
540 if (apm_info.allow_ints) {
541 if (irqs_disabled_flags(flags))
549 #define apm_irq_save(flags) \
550 do { flags = __apm_irq_save(); } while (0)
552 static inline void apm_irq_restore(unsigned long flags)
554 if (irqs_disabled_flags(flags))
556 else if (irqs_disabled())
561 # define APM_DECL_SEGS \
562 unsigned int saved_fs; unsigned int saved_gs;
563 # define APM_DO_SAVE_SEGS \
564 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
565 # define APM_DO_RESTORE_SEGS \
566 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
568 # define APM_DECL_SEGS
569 # define APM_DO_SAVE_SEGS
570 # define APM_DO_RESTORE_SEGS
573 struct apm_bios_call {
583 /* Error: -ENOMEM, or bits 8-15 of eax */
588 * __apm_bios_call - Make an APM BIOS 32bit call
589 * @_call: pointer to struct apm_bios_call.
591 * Make an APM call using the 32bit protected mode interface. The
592 * caller is responsible for knowing if APM BIOS is configured and
593 * enabled. This call can disable interrupts for a long period of
594 * time on some laptops. The return value is in AH and the carry
595 * flag is loaded into AL. If there is an error, then the error
596 * code is returned in AH (bits 8-15 of eax) and this function
599 * Note: this makes the call on the current CPU.
601 static long __apm_bios_call(void *_call)
606 struct desc_struct save_desc_40;
607 struct desc_struct *gdt;
608 struct apm_bios_call *call = _call;
612 gdt = get_cpu_gdt_table(cpu);
613 save_desc_40 = gdt[0x40 / 8];
614 gdt[0x40 / 8] = bad_bios_desc;
618 apm_bios_call_asm(call->func, call->ebx, call->ecx,
619 &call->eax, &call->ebx, &call->ecx, &call->edx,
622 apm_irq_restore(flags);
623 gdt[0x40 / 8] = save_desc_40;
626 return call->eax & 0xff;
629 /* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
630 static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
634 /* Don't bother with work_on_cpu in the common case, so we don't
635 * have to worry about OOM or overhead. */
636 if (get_cpu() == 0) {
641 ret = work_on_cpu(0, fn, call);
644 /* work_on_cpu can fail with -ENOMEM */
648 call->err = (call->eax >> 8) & 0xff;
654 * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0)
655 * @call: the apm_bios_call registers.
657 * If there is an error, it is returned in @call.err.
659 static int apm_bios_call(struct apm_bios_call *call)
661 return on_cpu0(__apm_bios_call, call);
665 * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
666 * @_call: pointer to struct apm_bios_call.
668 * Make a BIOS call that returns one value only, or just status.
669 * If there is an error, then the error code is returned in AH
670 * (bits 8-15 of eax) and this function returns non-zero (it can
671 * also return -ENOMEM). This is used for simpler BIOS operations.
672 * This call may hold interrupts off for a long time on some laptops.
674 * Note: this makes the call on the current CPU.
676 static long __apm_bios_call_simple(void *_call)
682 struct desc_struct save_desc_40;
683 struct desc_struct *gdt;
684 struct apm_bios_call *call = _call;
688 gdt = get_cpu_gdt_table(cpu);
689 save_desc_40 = gdt[0x40 / 8];
690 gdt[0x40 / 8] = bad_bios_desc;
694 error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
697 apm_irq_restore(flags);
698 gdt[0x40 / 8] = save_desc_40;
704 * apm_bios_call_simple - make a simple APM BIOS 32bit call
705 * @func: APM function to invoke
706 * @ebx_in: EBX register value for BIOS call
707 * @ecx_in: ECX register value for BIOS call
708 * @eax: EAX register on return from the BIOS call
711 * Make a BIOS call that returns one value only, or just status.
712 * If there is an error, then the error code is returned in @err
713 * and this function returns non-zero. This is used for simpler
714 * BIOS operations. This call may hold interrupts off for a long
715 * time on some laptops.
717 static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
720 struct apm_bios_call call;
727 ret = on_cpu0(__apm_bios_call_simple, &call);
734 * apm_driver_version - APM driver version
735 * @val: loaded with the APM version on return
737 * Retrieve the APM version supported by the BIOS. This is only
738 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
741 * On entry val should point to a value indicating the APM driver
742 * version with the high byte being the major and the low byte the
743 * minor number both in BCD
745 * On return it will hold the BIOS revision supported in the
749 static int apm_driver_version(u_short *val)
754 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
761 * apm_get_event - get an APM event from the BIOS
762 * @event: pointer to the event
763 * @info: point to the event information
765 * The APM BIOS provides a polled information for event
766 * reporting. The BIOS expects to be polled at least every second
767 * when events are pending. When a message is found the caller should
768 * poll until no more messages are present. However, this causes
769 * problems on some laptops where a suspend event notification is
770 * not cleared until it is acknowledged.
772 * Additional information is returned in the info pointer, providing
773 * that APM 1.2 is in use. If no messges are pending the value 0x80
774 * is returned (No power management events pending).
776 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
778 struct apm_bios_call call;
780 call.func = APM_FUNC_GET_EVENT;
781 call.ebx = call.ecx = 0;
783 if (apm_bios_call(&call))
787 if (apm_info.connection_version < 0x0102)
788 *info = ~0; /* indicate info not valid */
795 * set_power_state - set the power management state
796 * @what: which items to transition
797 * @state: state to transition to
799 * Request an APM change of state for one or more system devices. The
800 * processor state must be transitioned last of all. what holds the
801 * class of device in the upper byte and the device number (0xFF for
802 * all) for the object to be transitioned.
804 * The state holds the state to transition to, which may in fact
805 * be an acceptance of a BIOS requested state change.
808 static int set_power_state(u_short what, u_short state)
813 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
819 * set_system_power_state - set system wide power state
820 * @state: which state to enter
822 * Transition the entire system into a new APM power state.
825 static int set_system_power_state(u_short state)
827 return set_power_state(APM_DEVICE_ALL, state);
831 * apm_do_idle - perform power saving
833 * This function notifies the BIOS that the processor is (in the view
834 * of the OS) idle. It returns -1 in the event that the BIOS refuses
835 * to handle the idle request. On a success the function returns 1
836 * if the BIOS did clock slowing or 0 otherwise.
839 static int apm_do_idle(void)
847 if (!need_resched()) {
849 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
856 static unsigned long t;
858 /* This always fails on some SMP boards running UP kernels.
859 * Only report the failure the first 5 times.
862 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
867 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
872 * apm_do_busy - inform the BIOS the CPU is busy
874 * Request that the BIOS brings the CPU back to full performance.
877 static void apm_do_busy(void)
882 if (clock_slowed || ALWAYS_CALL_BUSY) {
883 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
889 * If no process has really been interested in
890 * the CPU for some time, we want to call BIOS
891 * power management - we probably want
894 #define IDLE_CALC_LIMIT (HZ * 100)
895 #define IDLE_LEAKY_MAX 16
898 * apm_cpu_idle - cpu idling for APM capable Linux
900 * This is the idling function the kernel executes when APM is available. It
901 * tries to do BIOS powermanagement based on the average system idle time.
902 * Furthermore it calls the system default idle routine.
905 static int apm_cpu_idle(struct cpuidle_device *dev,
906 struct cpuidle_driver *drv, int index)
908 static int use_apm_idle; /* = 0 */
909 static unsigned int last_jiffies; /* = 0 */
910 static unsigned int last_stime; /* = 0 */
913 int apm_idle_done = 0;
914 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
918 task_cputime(current, NULL, &stime);
919 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
921 } else if (jiffies_since_last_check > idle_period) {
922 unsigned int idle_percentage;
924 idle_percentage = stime - last_stime;
925 idle_percentage *= 100;
926 idle_percentage /= jiffies_since_last_check;
927 use_apm_idle = (idle_percentage > idle_threshold);
928 if (apm_info.forbid_idle)
932 last_jiffies = jiffies;
935 bucket = IDLE_LEAKY_MAX;
937 while (!need_resched()) {
942 switch (apm_do_idle()) {
947 bucket = IDLE_LEAKY_MAX;
958 default: /* BIOS refused */
964 jiffies_since_last_check = jiffies - last_jiffies;
965 if (jiffies_since_last_check > idle_period)
976 * apm_power_off - ask the BIOS to power off
978 * Handle the power off sequence. This is the one piece of code we
979 * will execute even on SMP machines. In order to deal with BIOS
980 * bugs we support real mode APM BIOS power off calls. We also make
981 * the SMP call on CPU0 as some systems will only honour this call
982 * on their first cpu.
985 static void apm_power_off(void)
987 /* Some bioses don't like being called from CPU != 0 */
988 if (apm_info.realmode_power_off) {
989 set_cpus_allowed_ptr(current, cpumask_of(0));
990 machine_real_restart(MRR_APM);
992 (void)set_system_power_state(APM_STATE_OFF);
996 #ifdef CONFIG_APM_DO_ENABLE
999 * apm_enable_power_management - enable BIOS APM power management
1000 * @enable: enable yes/no
1002 * Enable or disable the APM BIOS power services.
1005 static int apm_enable_power_management(int enable)
1010 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1011 return APM_NOT_ENGAGED;
1012 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1013 enable, &eax, &err))
1016 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1018 apm_info.bios.flags |= APM_BIOS_DISABLED;
1024 * apm_get_power_status - get current power state
1025 * @status: returned status
1026 * @bat: battery info
1027 * @life: estimated life
1029 * Obtain the current power status from the APM BIOS. We return a
1030 * status which gives the rough battery status, and current power
1031 * source. The bat value returned give an estimate as a percentage
1032 * of life and a status value for the battery. The estimated life
1033 * if reported is a lifetime in secodnds/minutes at current powwer
1037 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1039 struct apm_bios_call call;
1041 call.func = APM_FUNC_GET_STATUS;
1042 call.ebx = APM_DEVICE_ALL;
1045 if (apm_info.get_power_status_broken)
1046 return APM_32_UNSUPPORTED;
1047 if (apm_bios_call(&call))
1051 if (apm_info.get_power_status_swabinminutes) {
1052 *life = swab16((u16)call.edx);
1060 static int apm_get_battery_status(u_short which, u_short *status,
1061 u_short *bat, u_short *life, u_short *nbat)
1069 if (apm_info.connection_version < 0x0102) {
1070 /* pretend we only have one battery. */
1072 return APM_BAD_DEVICE;
1074 return apm_get_power_status(status, bat, life);
1077 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1078 &ebx, &ecx, &edx, &esi))
1079 return (eax >> 8) & 0xff;
1089 * apm_engage_power_management - enable PM on a device
1090 * @device: identity of device
1093 * Activate or deactive power management on either a specific device
1094 * or the entire system (%APM_DEVICE_ALL).
1097 static int apm_engage_power_management(u_short device, int enable)
1102 if ((enable == 0) && (device == APM_DEVICE_ALL)
1103 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1104 return APM_DISABLED;
1105 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1108 if (device == APM_DEVICE_ALL) {
1110 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1112 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1117 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1120 * apm_console_blank - blank the display
1123 * Attempt to blank the console, firstly by blanking just video device
1124 * zero, and if that fails (some BIOSes don't support it) then it blanks
1125 * all video devices. Typically the BIOS will do laptop backlight and
1126 * monitor powerdown for us.
1129 static int apm_console_blank(int blank)
1131 int error = APM_NOT_ENGAGED; /* silence gcc */
1134 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1136 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1138 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1139 error = set_power_state(dev[i], state);
1141 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1144 if (error == APM_NOT_ENGAGED)
1148 if (error == APM_NOT_ENGAGED) {
1152 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1154 apm_error("set display", error);
1155 apm_error("engage interface", eng_error);
1158 return apm_console_blank(blank);
1161 apm_error("set display", error);
1166 static int queue_empty(struct apm_user *as)
1168 return as->event_head == as->event_tail;
1171 static apm_event_t get_queued_event(struct apm_user *as)
1173 if (++as->event_tail >= APM_MAX_EVENTS)
1175 return as->events[as->event_tail];
1178 static void queue_event(apm_event_t event, struct apm_user *sender)
1180 struct apm_user *as;
1182 spin_lock(&user_list_lock);
1183 if (user_list == NULL)
1185 for (as = user_list; as != NULL; as = as->next) {
1186 if ((as == sender) || (!as->reader))
1188 if (++as->event_head >= APM_MAX_EVENTS)
1191 if (as->event_head == as->event_tail) {
1192 static int notified;
1194 if (notified++ == 0)
1195 pr_err("an event queue overflowed\n");
1196 if (++as->event_tail >= APM_MAX_EVENTS)
1199 as->events[as->event_head] = event;
1200 if (!as->suser || !as->writer)
1203 case APM_SYS_SUSPEND:
1204 case APM_USER_SUSPEND:
1205 as->suspends_pending++;
1209 case APM_SYS_STANDBY:
1210 case APM_USER_STANDBY:
1211 as->standbys_pending++;
1216 wake_up_interruptible(&apm_waitqueue);
1218 spin_unlock(&user_list_lock);
1221 static void reinit_timer(void)
1223 #ifdef INIT_TIMER_AFTER_SUSPEND
1224 unsigned long flags;
1226 raw_spin_lock_irqsave(&i8253_lock, flags);
1227 /* set the clock to HZ */
1228 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1230 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1232 outb_p(LATCH >> 8, PIT_CH0); /* MSB */
1234 raw_spin_unlock_irqrestore(&i8253_lock, flags);
1238 static int suspend(int vetoable)
1241 struct apm_user *as;
1243 dpm_suspend_start(PMSG_SUSPEND);
1244 dpm_suspend_end(PMSG_SUSPEND);
1246 local_irq_disable();
1251 save_processor_state();
1252 err = set_system_power_state(APM_STATE_SUSPEND);
1253 ignore_normal_resume = 1;
1254 restore_processor_state();
1256 local_irq_disable();
1259 if (err == APM_NO_ERROR)
1261 if (err != APM_SUCCESS)
1262 apm_error("suspend", err);
1263 err = (err == APM_SUCCESS) ? 0 : -EIO;
1268 dpm_resume_start(PMSG_RESUME);
1269 dpm_resume_end(PMSG_RESUME);
1271 queue_event(APM_NORMAL_RESUME, NULL);
1272 spin_lock(&user_list_lock);
1273 for (as = user_list; as != NULL; as = as->next) {
1274 as->suspend_wait = 0;
1275 as->suspend_result = err;
1277 spin_unlock(&user_list_lock);
1278 wake_up_interruptible(&apm_suspend_waitqueue);
1282 static void standby(void)
1286 dpm_suspend_end(PMSG_SUSPEND);
1288 local_irq_disable();
1292 err = set_system_power_state(APM_STATE_STANDBY);
1293 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1294 apm_error("standby", err);
1296 local_irq_disable();
1300 dpm_resume_start(PMSG_RESUME);
1303 static apm_event_t get_event(void)
1306 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1307 apm_eventinfo_t info;
1309 static int notified;
1311 /* we don't use the eventinfo */
1312 error = apm_get_event(&event, &info);
1313 if (error == APM_SUCCESS)
1316 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1317 apm_error("get_event", error);
1322 static void check_events(void)
1325 static unsigned long last_resume;
1326 static int ignore_bounce;
1328 while ((event = get_event()) != 0) {
1330 if (event <= NR_APM_EVENT_NAME)
1331 printk(KERN_DEBUG "apm: received %s notify\n",
1332 apm_event_name[event - 1]);
1334 printk(KERN_DEBUG "apm: received unknown "
1335 "event 0x%02x\n", event);
1338 && (time_after(jiffies, last_resume + bounce_interval)))
1342 case APM_SYS_STANDBY:
1343 case APM_USER_STANDBY:
1344 queue_event(event, NULL);
1345 if (standbys_pending <= 0)
1349 case APM_USER_SUSPEND:
1350 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1351 if (apm_info.connection_version > 0x100)
1352 set_system_power_state(APM_STATE_REJECT);
1355 case APM_SYS_SUSPEND:
1356 if (ignore_bounce) {
1357 if (apm_info.connection_version > 0x100)
1358 set_system_power_state(APM_STATE_REJECT);
1362 * If we are already processing a SUSPEND,
1363 * then further SUSPEND events from the BIOS
1364 * will be ignored. We also return here to
1365 * cope with the fact that the Thinkpads keep
1366 * sending a SUSPEND event until something else
1369 if (ignore_sys_suspend)
1371 ignore_sys_suspend = 1;
1372 queue_event(event, NULL);
1373 if (suspends_pending <= 0)
1377 case APM_NORMAL_RESUME:
1378 case APM_CRITICAL_RESUME:
1379 case APM_STANDBY_RESUME:
1380 ignore_sys_suspend = 0;
1381 last_resume = jiffies;
1383 if ((event != APM_NORMAL_RESUME)
1384 || (ignore_normal_resume == 0)) {
1385 dpm_resume_end(PMSG_RESUME);
1386 queue_event(event, NULL);
1388 ignore_normal_resume = 0;
1391 case APM_CAPABILITY_CHANGE:
1392 case APM_LOW_BATTERY:
1393 case APM_POWER_STATUS_CHANGE:
1394 queue_event(event, NULL);
1395 /* If needed, notify drivers here */
1398 case APM_UPDATE_TIME:
1401 case APM_CRITICAL_SUSPEND:
1403 * We are not allowed to reject a critical suspend.
1411 static void apm_event_handler(void)
1413 static int pending_count = 4;
1416 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1417 if ((apm_info.connection_version > 0x100) &&
1418 (pending_count-- <= 0)) {
1421 printk(KERN_DEBUG "apm: setting state busy\n");
1422 err = set_system_power_state(APM_STATE_BUSY);
1424 apm_error("busy", err);
1432 * This is the APM thread main loop.
1435 static void apm_mainloop(void)
1437 DECLARE_WAITQUEUE(wait, current);
1439 add_wait_queue(&apm_waitqueue, &wait);
1440 set_current_state(TASK_INTERRUPTIBLE);
1442 schedule_timeout(APM_CHECK_TIMEOUT);
1443 if (kthread_should_stop())
1446 * Ok, check all events, check for idle (and mark us sleeping
1447 * so as not to count towards the load average)..
1449 set_current_state(TASK_INTERRUPTIBLE);
1450 apm_event_handler();
1452 remove_wait_queue(&apm_waitqueue, &wait);
1455 static int check_apm_user(struct apm_user *as, const char *func)
1457 if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1458 pr_err("%s passed bad filp\n", func);
1464 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1466 struct apm_user *as;
1470 as = fp->private_data;
1471 if (check_apm_user(as, "read"))
1473 if ((int)count < sizeof(apm_event_t))
1475 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1477 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1479 while ((i >= sizeof(event)) && !queue_empty(as)) {
1480 event = get_queued_event(as);
1481 if (copy_to_user(buf, &event, sizeof(event))) {
1487 case APM_SYS_SUSPEND:
1488 case APM_USER_SUSPEND:
1489 as->suspends_read++;
1492 case APM_SYS_STANDBY:
1493 case APM_USER_STANDBY:
1494 as->standbys_read++;
1497 buf += sizeof(event);
1502 if (signal_pending(current))
1503 return -ERESTARTSYS;
1507 static unsigned int do_poll(struct file *fp, poll_table *wait)
1509 struct apm_user *as;
1511 as = fp->private_data;
1512 if (check_apm_user(as, "poll"))
1514 poll_wait(fp, &apm_waitqueue, wait);
1515 if (!queue_empty(as))
1516 return POLLIN | POLLRDNORM;
1520 static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1522 struct apm_user *as;
1525 as = filp->private_data;
1526 if (check_apm_user(as, "ioctl"))
1528 if (!as->suser || !as->writer)
1531 case APM_IOC_STANDBY:
1532 mutex_lock(&apm_mutex);
1533 if (as->standbys_read > 0) {
1534 as->standbys_read--;
1535 as->standbys_pending--;
1538 queue_event(APM_USER_STANDBY, as);
1539 if (standbys_pending <= 0)
1541 mutex_unlock(&apm_mutex);
1543 case APM_IOC_SUSPEND:
1544 mutex_lock(&apm_mutex);
1545 if (as->suspends_read > 0) {
1546 as->suspends_read--;
1547 as->suspends_pending--;
1550 queue_event(APM_USER_SUSPEND, as);
1551 if (suspends_pending <= 0) {
1553 mutex_unlock(&apm_mutex);
1555 as->suspend_wait = 1;
1556 mutex_unlock(&apm_mutex);
1557 wait_event_interruptible(apm_suspend_waitqueue,
1558 as->suspend_wait == 0);
1559 ret = as->suspend_result;
1568 static int do_release(struct inode *inode, struct file *filp)
1570 struct apm_user *as;
1572 as = filp->private_data;
1573 if (check_apm_user(as, "release"))
1575 filp->private_data = NULL;
1576 if (as->standbys_pending > 0) {
1577 standbys_pending -= as->standbys_pending;
1578 if (standbys_pending <= 0)
1581 if (as->suspends_pending > 0) {
1582 suspends_pending -= as->suspends_pending;
1583 if (suspends_pending <= 0)
1586 spin_lock(&user_list_lock);
1587 if (user_list == as)
1588 user_list = as->next;
1590 struct apm_user *as1;
1592 for (as1 = user_list;
1593 (as1 != NULL) && (as1->next != as);
1597 pr_err("filp not in user list\n");
1599 as1->next = as->next;
1601 spin_unlock(&user_list_lock);
1606 static int do_open(struct inode *inode, struct file *filp)
1608 struct apm_user *as;
1610 as = kmalloc(sizeof(*as), GFP_KERNEL);
1614 as->magic = APM_BIOS_MAGIC;
1615 as->event_tail = as->event_head = 0;
1616 as->suspends_pending = as->standbys_pending = 0;
1617 as->suspends_read = as->standbys_read = 0;
1619 * XXX - this is a tiny bit broken, when we consider BSD
1620 * process accounting. If the device is opened by root, we
1621 * instantly flag that we used superuser privs. Who knows,
1622 * we might close the device immediately without doing a
1623 * privileged operation -- cevans
1625 as->suser = capable(CAP_SYS_ADMIN);
1626 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1627 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1628 spin_lock(&user_list_lock);
1629 as->next = user_list;
1631 spin_unlock(&user_list_lock);
1632 filp->private_data = as;
1636 static int proc_apm_show(struct seq_file *m, void *v)
1642 unsigned short ac_line_status = 0xff;
1643 unsigned short battery_status = 0xff;
1644 unsigned short battery_flag = 0xff;
1645 int percentage = -1;
1646 int time_units = -1;
1649 if ((num_online_cpus() == 1) &&
1650 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1651 ac_line_status = (bx >> 8) & 0xff;
1652 battery_status = bx & 0xff;
1653 if ((cx & 0xff) != 0xff)
1654 percentage = cx & 0xff;
1656 if (apm_info.connection_version > 0x100) {
1657 battery_flag = (cx >> 8) & 0xff;
1659 units = (dx & 0x8000) ? "min" : "sec";
1660 time_units = dx & 0x7fff;
1664 /* Arguments, with symbols from linux/apm_bios.h. Information is
1665 from the Get Power Status (0x0a) call unless otherwise noted.
1667 0) Linux driver version (this will change if format changes)
1668 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1669 2) APM flags from APM Installation Check (0x00):
1670 bit 0: APM_16_BIT_SUPPORT
1671 bit 1: APM_32_BIT_SUPPORT
1672 bit 2: APM_IDLE_SLOWS_CLOCK
1673 bit 3: APM_BIOS_DISABLED
1674 bit 4: APM_BIOS_DISENGAGED
1678 0x02: On backup power (BIOS >= 1.1 only)
1685 0x04: Selected battery not present (BIOS >= 1.2 only)
1692 bit 7: No system battery
1694 6) Remaining battery life (percentage of charge):
1697 7) Remaining battery life (time units):
1698 Number of remaining minutes or seconds
1700 8) min = minutes; sec = seconds */
1702 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1704 (apm_info.bios.version >> 8) & 0xff,
1705 apm_info.bios.version & 0xff,
1706 apm_info.bios.flags,
1716 static int proc_apm_open(struct inode *inode, struct file *file)
1718 return single_open(file, proc_apm_show, NULL);
1721 static const struct file_operations apm_file_ops = {
1722 .owner = THIS_MODULE,
1723 .open = proc_apm_open,
1725 .llseek = seq_lseek,
1726 .release = single_release,
1729 static int apm(void *unused)
1739 * This is to avoid random crashes at boot time during initialization
1740 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1741 * Some bioses don't like being called from CPU != 0.
1742 * Method suggested by Ingo Molnar.
1744 set_cpus_allowed_ptr(current, cpumask_of(0));
1745 BUG_ON(smp_processor_id() != 0);
1747 if (apm_info.connection_version == 0) {
1748 apm_info.connection_version = apm_info.bios.version;
1749 if (apm_info.connection_version > 0x100) {
1751 * We only support BIOSs up to version 1.2
1753 if (apm_info.connection_version > 0x0102)
1754 apm_info.connection_version = 0x0102;
1755 error = apm_driver_version(&apm_info.connection_version);
1756 if (error != APM_SUCCESS) {
1757 apm_error("driver version", error);
1758 /* Fall back to an APM 1.0 connection. */
1759 apm_info.connection_version = 0x100;
1765 printk(KERN_INFO "apm: Connection version %d.%d\n",
1766 (apm_info.connection_version >> 8) & 0xff,
1767 apm_info.connection_version & 0xff);
1769 #ifdef CONFIG_APM_DO_ENABLE
1770 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1772 * This call causes my NEC UltraLite Versa 33/C to hang if it
1773 * is booted with PM disabled but not in the docking station.
1776 error = apm_enable_power_management(1);
1778 apm_error("enable power management", error);
1784 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1785 && (apm_info.connection_version > 0x0100)) {
1786 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1788 apm_error("engage power management", error);
1793 if (debug && (num_online_cpus() == 1 || smp)) {
1794 error = apm_get_power_status(&bx, &cx, &dx);
1796 printk(KERN_INFO "apm: power status not available\n");
1798 switch ((bx >> 8) & 0xff) {
1800 power_stat = "off line";
1803 power_stat = "on line";
1806 power_stat = "on backup power";
1809 power_stat = "unknown";
1812 switch (bx & 0xff) {
1820 bat_stat = "critical";
1823 bat_stat = "charging";
1826 bat_stat = "unknown";
1830 "apm: AC %s, battery status %s, battery life ",
1831 power_stat, bat_stat);
1832 if ((cx & 0xff) == 0xff)
1833 printk("unknown\n");
1835 printk("%d%%\n", cx & 0xff);
1836 if (apm_info.connection_version > 0x100) {
1838 "apm: battery flag 0x%02x, battery life ",
1841 printk("unknown\n");
1843 printk("%d %s\n", dx & 0x7fff,
1845 "minutes" : "seconds");
1850 /* Install our power off handler.. */
1852 pm_power_off = apm_power_off;
1854 if (num_online_cpus() == 1 || smp) {
1855 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1856 console_blank_hook = apm_console_blank;
1859 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1860 console_blank_hook = NULL;
1868 static int __init apm_setup(char *str)
1872 while ((str != NULL) && (*str != '\0')) {
1873 if (strncmp(str, "off", 3) == 0)
1875 if (strncmp(str, "on", 2) == 0)
1877 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1878 (strncmp(str, "bounce_interval=", 16) == 0))
1879 bounce_interval = simple_strtol(str + 16, NULL, 0);
1880 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1881 (strncmp(str, "idle_threshold=", 15) == 0))
1882 idle_threshold = simple_strtol(str + 15, NULL, 0);
1883 if ((strncmp(str, "idle-period=", 12) == 0) ||
1884 (strncmp(str, "idle_period=", 12) == 0))
1885 idle_period = simple_strtol(str + 12, NULL, 0);
1886 invert = (strncmp(str, "no-", 3) == 0) ||
1887 (strncmp(str, "no_", 3) == 0);
1890 if (strncmp(str, "debug", 5) == 0)
1892 if ((strncmp(str, "power-off", 9) == 0) ||
1893 (strncmp(str, "power_off", 9) == 0))
1894 power_off = !invert;
1895 if (strncmp(str, "smp", 3) == 0) {
1897 idle_threshold = 100;
1899 if ((strncmp(str, "allow-ints", 10) == 0) ||
1900 (strncmp(str, "allow_ints", 10) == 0))
1901 apm_info.allow_ints = !invert;
1902 if ((strncmp(str, "broken-psr", 10) == 0) ||
1903 (strncmp(str, "broken_psr", 10) == 0))
1904 apm_info.get_power_status_broken = !invert;
1905 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1906 (strncmp(str, "realmode_power_off", 18) == 0))
1907 apm_info.realmode_power_off = !invert;
1908 str = strchr(str, ',');
1910 str += strspn(str, ", \t");
1915 __setup("apm=", apm_setup);
1918 static const struct file_operations apm_bios_fops = {
1919 .owner = THIS_MODULE,
1922 .unlocked_ioctl = do_ioctl,
1924 .release = do_release,
1925 .llseek = noop_llseek,
1928 static struct miscdevice apm_device = {
1935 /* Simple "print if true" callback */
1936 static int __init print_if_true(const struct dmi_system_id *d)
1938 printk("%s\n", d->ident);
1943 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1944 * disabled before the suspend. Linux used to get terribly confused by that.
1946 static int __init broken_ps2_resume(const struct dmi_system_id *d)
1948 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1949 "workaround hopefully not needed.\n", d->ident);
1953 /* Some bioses have a broken protected mode poweroff and need to use realmode */
1954 static int __init set_realmode_power_off(const struct dmi_system_id *d)
1956 if (apm_info.realmode_power_off == 0) {
1957 apm_info.realmode_power_off = 1;
1958 printk(KERN_INFO "%s bios detected. "
1959 "Using realmode poweroff only.\n", d->ident);
1964 /* Some laptops require interrupts to be enabled during APM calls */
1965 static int __init set_apm_ints(const struct dmi_system_id *d)
1967 if (apm_info.allow_ints == 0) {
1968 apm_info.allow_ints = 1;
1969 printk(KERN_INFO "%s machine detected. "
1970 "Enabling interrupts during APM calls.\n", d->ident);
1975 /* Some APM bioses corrupt memory or just plain do not work */
1976 static int __init apm_is_horked(const struct dmi_system_id *d)
1978 if (apm_info.disabled == 0) {
1979 apm_info.disabled = 1;
1980 printk(KERN_INFO "%s machine detected. "
1981 "Disabling APM.\n", d->ident);
1986 static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1988 if (apm_info.disabled == 0) {
1989 apm_info.disabled = 1;
1990 printk(KERN_INFO "%s machine detected. "
1991 "Disabling APM.\n", d->ident);
1992 printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
1993 printk(KERN_INFO "download from support.intel.com\n");
1998 /* Some APM bioses hang on APM idle calls */
1999 static int __init apm_likes_to_melt(const struct dmi_system_id *d)
2001 if (apm_info.forbid_idle == 0) {
2002 apm_info.forbid_idle = 1;
2003 printk(KERN_INFO "%s machine detected. "
2004 "Disabling APM idle calls.\n", d->ident);
2010 * Check for clue free BIOS implementations who use
2011 * the following QA technique
2013 * [ Write BIOS Code ]<------
2015 * < Does it Compile >----N--
2017 * < Does it Boot Win98 >-N--
2021 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
2022 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
2024 static int __init broken_apm_power(const struct dmi_system_id *d)
2026 apm_info.get_power_status_broken = 1;
2027 printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2028 "disabling power status reporting.\n");
2033 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2034 * have this problem).
2036 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2038 apm_info.get_power_status_swabinminutes = 1;
2039 printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2040 "in minutes and wrong byte order.\n");
2044 static struct dmi_system_id __initdata apm_dmi_table[] = {
2047 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2048 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2049 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2051 { /* Handle problems with APM on the C600 */
2052 broken_ps2_resume, "Dell Latitude C600",
2053 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2054 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2056 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2057 set_apm_ints, "Dell Latitude",
2058 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2059 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2062 apm_is_horked, "Dell Inspiron 2500",
2063 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2064 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2065 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2066 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2068 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2069 set_apm_ints, "Dell Inspiron", {
2070 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2071 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2073 { /* Handle problems with APM on Inspiron 5000e */
2074 broken_apm_power, "Dell Inspiron 5000e",
2075 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2076 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2077 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2079 { /* Handle problems with APM on Inspiron 2500 */
2080 broken_apm_power, "Dell Inspiron 2500",
2081 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2082 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2083 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2086 apm_is_horked, "Dell Dimension 4100",
2087 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2088 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2089 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2090 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2092 { /* Allow interrupts during suspend on Compaq Laptops*/
2093 set_apm_ints, "Compaq 12XL125",
2094 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2095 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2096 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2097 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2099 { /* Allow interrupts during APM or the clock goes slow */
2100 set_apm_ints, "ASUSTeK",
2101 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2102 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2104 { /* APM blows on shutdown */
2105 apm_is_horked, "ABIT KX7-333[R]",
2106 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2107 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2110 apm_is_horked, "Trigem Delhi3",
2111 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2112 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2115 apm_is_horked, "Fujitsu-Siemens",
2116 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2117 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2120 apm_is_horked_d850md, "Intel D850MD",
2121 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2122 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2125 apm_is_horked, "Intel D810EMO",
2126 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2127 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2130 apm_is_horked, "Dell XPS-Z",
2131 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2132 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2133 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2136 apm_is_horked, "Sharp PC-PJ/AX",
2137 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2138 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2139 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2140 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2143 apm_is_horked, "Dell Inspiron 2500",
2144 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2145 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2146 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2147 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2149 { /* APM idle hangs */
2150 apm_likes_to_melt, "Jabil AMD",
2151 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2152 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2154 { /* APM idle hangs */
2155 apm_likes_to_melt, "AMI Bios",
2156 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2157 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2159 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2160 swab_apm_power_in_minutes, "Sony VAIO",
2161 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2162 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2163 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2165 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2166 swab_apm_power_in_minutes, "Sony VAIO",
2167 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2168 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2169 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2171 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2172 swab_apm_power_in_minutes, "Sony VAIO",
2173 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2174 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2175 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2177 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2178 swab_apm_power_in_minutes, "Sony VAIO",
2179 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2180 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2181 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2183 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2184 swab_apm_power_in_minutes, "Sony VAIO",
2185 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2186 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2187 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2189 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2190 swab_apm_power_in_minutes, "Sony VAIO",
2191 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2192 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2193 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2195 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2196 swab_apm_power_in_minutes, "Sony VAIO",
2197 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2198 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2199 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2201 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2202 swab_apm_power_in_minutes, "Sony VAIO",
2203 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2204 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2205 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2207 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2208 swab_apm_power_in_minutes, "Sony VAIO",
2209 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2210 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2211 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2213 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2214 swab_apm_power_in_minutes, "Sony VAIO",
2215 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2216 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2217 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2220 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2221 swab_apm_power_in_minutes, "Sony VAIO",
2222 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2223 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2224 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2226 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2227 swab_apm_power_in_minutes, "Sony VAIO",
2228 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2229 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2230 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2232 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2233 swab_apm_power_in_minutes, "Sony VAIO",
2234 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2235 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2236 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2238 { /* broken PM poweroff bios */
2239 set_realmode_power_off, "Award Software v4.60 PGMA",
2240 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2241 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2242 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2245 /* Generic per vendor APM settings */
2247 { /* Allow interrupts during suspend on IBM laptops */
2248 set_apm_ints, "IBM",
2249 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2256 * Just start the APM thread. We do NOT want to do APM BIOS
2257 * calls from anything but the APM thread, if for no other reason
2258 * than the fact that we don't trust the APM BIOS. This way,
2259 * most common APM BIOS problems that lead to protection errors
2260 * etc will have at least some level of being contained...
2262 * In short, if something bad happens, at least we have a choice
2263 * of just killing the apm thread..
2265 static int __init apm_init(void)
2267 struct desc_struct *gdt;
2270 dmi_check_system(apm_dmi_table);
2272 if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) {
2273 printk(KERN_INFO "apm: BIOS not found.\n");
2277 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2278 ((apm_info.bios.version >> 8) & 0xff),
2279 (apm_info.bios.version & 0xff),
2280 apm_info.bios.flags,
2282 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2283 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2288 apm_info.allow_ints = 1;
2290 apm_info.get_power_status_broken = 1;
2291 if (realmode_power_off)
2292 apm_info.realmode_power_off = 1;
2293 /* User can override, but default is to trust DMI */
2294 if (apm_disabled != -1)
2295 apm_info.disabled = apm_disabled;
2298 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2299 * but is reportedly a 1.0 BIOS.
2301 if (apm_info.bios.version == 0x001)
2302 apm_info.bios.version = 0x100;
2304 /* BIOS < 1.2 doesn't set cseg_16_len */
2305 if (apm_info.bios.version < 0x102)
2306 apm_info.bios.cseg_16_len = 0; /* 64k */
2309 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2310 apm_info.bios.cseg, apm_info.bios.offset,
2311 apm_info.bios.cseg_16, apm_info.bios.dseg);
2312 if (apm_info.bios.version > 0x100)
2313 printk(" cseg len %x, dseg len %x",
2314 apm_info.bios.cseg_len,
2315 apm_info.bios.dseg_len);
2316 if (apm_info.bios.version > 0x101)
2317 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2321 if (apm_info.disabled) {
2322 pr_notice("disabled on user request.\n");
2325 if ((num_online_cpus() > 1) && !power_off && !smp) {
2326 pr_notice("disabled - APM is not SMP safe.\n");
2327 apm_info.disabled = 1;
2330 if (!acpi_disabled) {
2331 pr_notice("overridden by ACPI.\n");
2332 apm_info.disabled = 1;
2337 * Set up the long jump entry point to the APM BIOS, which is called
2338 * from inline assembly.
2340 apm_bios_entry.offset = apm_info.bios.offset;
2341 apm_bios_entry.segment = APM_CS;
2344 * The APM 1.1 BIOS is supposed to provide limit information that it
2345 * recognizes. Many machines do this correctly, but many others do
2346 * not restrict themselves to their claimed limit. When this happens,
2347 * they will cause a segmentation violation in the kernel at boot time.
2348 * Most BIOS's, however, will respect a 64k limit, so we use that.
2350 * Note we only set APM segments on CPU zero, since we pin the APM
2353 gdt = get_cpu_gdt_table(0);
2354 set_desc_base(&gdt[APM_CS >> 3],
2355 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2356 set_desc_base(&gdt[APM_CS_16 >> 3],
2357 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2358 set_desc_base(&gdt[APM_DS >> 3],
2359 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2361 proc_create("apm", 0, NULL, &apm_file_ops);
2363 kapmd_task = kthread_create(apm, NULL, "kapmd");
2364 if (IS_ERR(kapmd_task)) {
2365 pr_err("disabled - Unable to start kernel thread\n");
2366 err = PTR_ERR(kapmd_task);
2368 remove_proc_entry("apm", NULL);
2371 wake_up_process(kapmd_task);
2373 if (num_online_cpus() > 1 && !smp) {
2375 "apm: disabled - APM is not SMP safe (power off active).\n");
2380 * Note we don't actually care if the misc_device cannot be registered.
2381 * this driver can do its job without it, even if userspace can't
2382 * control it. just log the error
2384 if (misc_register(&apm_device))
2385 printk(KERN_WARNING "apm: Could not register misc device.\n");
2388 idle_period = (idle_period * HZ) / 100;
2389 if (idle_threshold < 100) {
2390 if (!cpuidle_register_driver(&apm_idle_driver))
2391 if (cpuidle_register_device(&apm_cpuidle_device))
2392 cpuidle_unregister_driver(&apm_idle_driver);
2398 static void __exit apm_exit(void)
2402 cpuidle_unregister_device(&apm_cpuidle_device);
2403 cpuidle_unregister_driver(&apm_idle_driver);
2405 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2406 && (apm_info.connection_version > 0x0100)) {
2407 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2409 apm_error("disengage power management", error);
2411 misc_deregister(&apm_device);
2412 remove_proc_entry("apm", NULL);
2414 pm_power_off = NULL;
2416 kthread_stop(kapmd_task);
2421 module_init(apm_init);
2422 module_exit(apm_exit);
2424 MODULE_AUTHOR("Stephen Rothwell");
2425 MODULE_DESCRIPTION("Advanced Power Management");
2426 MODULE_LICENSE("GPL");
2427 module_param(debug, bool, 0644);
2428 MODULE_PARM_DESC(debug, "Enable debug mode");
2429 module_param(power_off, bool, 0444);
2430 MODULE_PARM_DESC(power_off, "Enable power off");
2431 module_param(bounce_interval, int, 0444);
2432 MODULE_PARM_DESC(bounce_interval,
2433 "Set the number of ticks to ignore suspend bounces");
2434 module_param(allow_ints, bool, 0444);
2435 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2436 module_param(broken_psr, bool, 0444);
2437 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2438 module_param(realmode_power_off, bool, 0444);
2439 MODULE_PARM_DESC(realmode_power_off,
2440 "Switch to real mode before powering off");
2441 module_param(idle_threshold, int, 0444);
2442 MODULE_PARM_DESC(idle_threshold,
2443 "System idle percentage above which to make APM BIOS idle calls");
2444 module_param(idle_period, int, 0444);
2445 MODULE_PARM_DESC(idle_period,
2446 "Period (in sec/100) over which to caculate the idle percentage");
2447 module_param(smp, bool, 0444);
2448 MODULE_PARM_DESC(smp,
2449 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2450 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);