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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* -*- linux-c -*-
3 * APM BIOS driver for Linux
4 * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
5 *
6 * Initial development of this driver was funded by NEC Australia P/L
7 * and NEC Corporation
8 *
9 * October 1995, Rik Faith (faith@cs.unc.edu):
10 * Minor enhancements and updates (to the patch set) for 1.3.x
11 * Documentation
12 * January 1996, Rik Faith (faith@cs.unc.edu):
13 * Make /proc/apm easy to format (bump driver version)
14 * March 1996, Rik Faith (faith@cs.unc.edu):
15 * Prohibit APM BIOS calls unless apm_enabled.
16 * (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>)
17 * April 1996, Stephen Rothwell (sfr@canb.auug.org.au)
18 * Version 1.0 and 1.1
19 * May 1996, Version 1.2
20 * Feb 1998, Version 1.3
21 * Feb 1998, Version 1.4
22 * Aug 1998, Version 1.5
23 * Sep 1998, Version 1.6
24 * Nov 1998, Version 1.7
25 * Jan 1999, Version 1.8
26 * Jan 1999, Version 1.9
27 * Oct 1999, Version 1.10
28 * Nov 1999, Version 1.11
29 * Jan 2000, Version 1.12
30 * Feb 2000, Version 1.13
31 * Nov 2000, Version 1.14
32 * Oct 2001, Version 1.15
33 * Jan 2002, Version 1.16
34 * Oct 2002, Version 1.16ac
35 *
36 * History:
37 * 0.6b: first version in official kernel, Linux 1.3.46
38 * 0.7: changed /proc/apm format, Linux 1.3.58
39 * 0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59
40 * 0.9: only call bios if bios is present, Linux 1.3.72
41 * 1.0: use fixed device number, consolidate /proc/apm into this file,
42 * Linux 1.3.85
43 * 1.1: support user-space standby and suspend, power off after system
44 * halted, Linux 1.3.98
45 * 1.2: When resetting RTC after resume, take care so that the time
46 * is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
47 * <jtoth@princeton.edu>); improve interaction between
48 * screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
49 * 1.2a:Simple change to stop mysterious bug reports with SMP also added
50 * levels to the printk calls. APM is not defined for SMP machines.
51 * The new replacement for it is, but Linux doesn't yet support this.
52 * Alan Cox Linux 2.1.55
53 * 1.3: Set up a valid data descriptor 0x40 for buggy BIOS's
54 * 1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by
55 * Dean Gaudet <dgaudet@arctic.org>.
56 * C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87
57 * 1.5: Fix segment register reloading (in case of bad segments saved
58 * across BIOS call).
59 * Stephen Rothwell
60 * 1.6: Cope with compiler/assembler differences.
61 * Only try to turn off the first display device.
62 * Fix OOPS at power off with no APM BIOS by Jan Echternach
63 * <echter@informatik.uni-rostock.de>
64 * Stephen Rothwell
65 * 1.7: Modify driver's cached copy of the disabled/disengaged flags
66 * to reflect current state of APM BIOS.
67 * Chris Rankin <rankinc@bellsouth.net>
68 * Reset interrupt 0 timer to 100Hz after suspend
69 * Chad Miller <cmiller@surfsouth.com>
70 * Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
71 * Richard Gooch <rgooch@atnf.csiro.au>
72 * Allow boot time disabling of APM
73 * Make boot messages far less verbose by default
74 * Make asm safer
75 * Stephen Rothwell
76 * 1.8: Add CONFIG_APM_RTC_IS_GMT
77 * Richard Gooch <rgooch@atnf.csiro.au>
78 * change APM_NOINTS to CONFIG_APM_ALLOW_INTS
79 * remove dependency on CONFIG_PROC_FS
80 * Stephen Rothwell
81 * 1.9: Fix small typo. <laslo@wodip.opole.pl>
82 * Try to cope with BIOS's that need to have all display
83 * devices blanked and not just the first one.
84 * Ross Paterson <ross@soi.city.ac.uk>
85 * Fix segment limit setting it has always been wrong as
86 * the segments needed to have byte granularity.
87 * Mark a few things __init.
88 * Add hack to allow power off of SMP systems by popular request.
89 * Use CONFIG_SMP instead of __SMP__
90 * Ignore BOUNCES for three seconds.
91 * Stephen Rothwell
92 * 1.10: Fix for Thinkpad return code.
93 * Merge 2.2 and 2.3 drivers.
94 * Remove APM dependencies in arch/i386/kernel/process.c
95 * Remove APM dependencies in drivers/char/sysrq.c
96 * Reset time across standby.
97 * Allow more initialisation on SMP.
98 * Remove CONFIG_APM_POWER_OFF and make it boot time
99 * configurable (default on).
100 * Make debug only a boot time parameter (remove APM_DEBUG).
101 * Try to blank all devices on any error.
102 * 1.11: Remove APM dependencies in drivers/char/console.c
103 * Check nr_running to detect if we are idle (from
104 * Borislav Deianov <borislav@lix.polytechnique.fr>)
105 * Fix for bioses that don't zero the top part of the
106 * entrypoint offset (Mario Sitta <sitta@al.unipmn.it>)
107 * (reported by Panos Katsaloulis <teras@writeme.com>).
108 * Real mode power off patch (Walter Hofmann
109 * <Walter.Hofmann@physik.stud.uni-erlangen.de>).
110 * 1.12: Remove CONFIG_SMP as the compiler will optimize
111 * the code away anyway (smp_num_cpus == 1 in UP)
112 * noted by Artur Skawina <skawina@geocities.com>.
113 * Make power off under SMP work again.
114 * Fix thinko with initial engaging of BIOS.
115 * Make sure power off only happens on CPU 0
116 * (Paul "Rusty" Russell <rusty@rustcorp.com.au>).
117 * Do error notification to user mode if BIOS calls fail.
118 * Move entrypoint offset fix to ...boot/setup.S
119 * where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>).
120 * Remove smp-power-off. SMP users must now specify
121 * "apm=power-off" on the kernel command line. Suggested
122 * by Jim Avera <jima@hal.com>, modified by Alan Cox
123 * <alan@lxorguk.ukuu.org.uk>.
124 * Register the /proc/apm entry even on SMP so that
125 * scripts that check for it before doing power off
126 * work (Jim Avera <jima@hal.com>).
127 * 1.13: Changes for new pm_ interfaces (Andy Henroid
128 * <andy_henroid@yahoo.com>).
129 * Modularize the code.
130 * Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS
131 * is now the way life works).
132 * Fix thinko in suspend() (wrong return).
133 * Notify drivers on critical suspend.
134 * Make kapmd absorb more idle time (Pavel Machek <pavel@ucw.cz>
135 * modified by sfr).
136 * Disable interrupts while we are suspended (Andy Henroid
137 * <andy_henroid@yahoo.com> fixed by sfr).
138 * Make power off work on SMP again (Tony Hoyle
139 * <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr.
140 * Remove CONFIG_APM_SUSPEND_BOUNCE. The bounce ignore
141 * interval is now configurable.
142 * 1.14: Make connection version persist across module unload/load.
143 * Enable and engage power management earlier.
144 * Disengage power management on module unload.
145 * Changed to use the sysrq-register hack for registering the
146 * power off function called by magic sysrq based upon discussions
147 * in irc://irc.openprojects.net/#kernelnewbies
148 * (Crutcher Dunnavant <crutcher+kernel@datastacks.com>).
149 * Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable.
150 * (Arjan van de Ven <arjanv@redhat.com>) modified by sfr.
151 * Work around byte swap bug in one of the Vaio's BIOS's
152 * (Marc Boucher <marc@mbsi.ca>).
153 * Exposed the disable flag to dmi so that we can handle known
154 * broken APM (Alan Cox <alan@lxorguk.ukuu.org.uk>).
155 * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
156 * calling it - instead idle. (Alan Cox <alan@lxorguk.ukuu.org.uk>)
157 * If an APM idle fails log it and idle sensibly
158 * 1.15: Don't queue events to clients who open the device O_WRONLY.
159 * Don't expect replies from clients who open the device O_RDONLY.
160 * (Idea from Thomas Hood)
161 * Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>)
162 * 1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.)
163 * Notify listeners of standby or suspend events before notifying
164 * drivers. Return EBUSY to ioctl() if suspend is rejected.
165 * (Russell King <rmk@arm.linux.org.uk> and Thomas Hood)
166 * Ignore first resume after we generate our own resume event
167 * after a suspend (Thomas Hood)
168 * Daemonize now gets rid of our controlling terminal (sfr).
169 * CONFIG_APM_CPU_IDLE now just affects the default value of
170 * idle_threshold (sfr).
171 * Change name of kernel apm daemon (as it no longer idles) (sfr).
172 * 1.16ac: Fix up SMP support somewhat. You can now force SMP on and we
173 * make _all_ APM calls on the CPU#0. Fix unsafe sign bug.
174 * TODO: determine if its "boot CPU" or "CPU0" we want to lock to.
175 *
176 * APM 1.1 Reference:
177 *
178 * Intel Corporation, Microsoft Corporation. Advanced Power Management
179 * (APM) BIOS Interface Specification, Revision 1.1, September 1993.
180 * Intel Order Number 241704-001. Microsoft Part Number 781-110-X01.
181 *
182 * [This document is available free from Intel by calling 800.628.8686 (fax
183 * 916.356.6100) or 800.548.4725; or from
184 * http://www.microsoft.com/whdc/archive/amp_12.mspx It is also
185 * available from Microsoft by calling 206.882.8080.]
186 *
187 * APM 1.2 Reference:
188 * Intel Corporation, Microsoft Corporation. Advanced Power Management
189 * (APM) BIOS Interface Specification, Revision 1.2, February 1996.
190 *
191 * [This document is available from Microsoft at:
192 * http://www.microsoft.com/whdc/archive/amp_12.mspx]
193 */
194
195#define pr_fmt(fmt) "apm: " fmt
196
197#include <linux/module.h>
198
199#include <linux/poll.h>
200#include <linux/types.h>
201#include <linux/stddef.h>
202#include <linux/timer.h>
203#include <linux/fcntl.h>
204#include <linux/slab.h>
205#include <linux/stat.h>
206#include <linux/proc_fs.h>
207#include <linux/seq_file.h>
208#include <linux/miscdevice.h>
209#include <linux/apm_bios.h>
210#include <linux/init.h>
211#include <linux/time.h>
212#include <linux/sched/signal.h>
213#include <linux/sched/cputime.h>
214#include <linux/pm.h>
215#include <linux/capability.h>
216#include <linux/device.h>
217#include <linux/kernel.h>
218#include <linux/freezer.h>
219#include <linux/smp.h>
220#include <linux/dmi.h>
221#include <linux/suspend.h>
222#include <linux/kthread.h>
223#include <linux/jiffies.h>
224#include <linux/acpi.h>
225#include <linux/syscore_ops.h>
226#include <linux/i8253.h>
227#include <linux/cpuidle.h>
228
229#include <linux/uaccess.h>
230#include <asm/desc.h>
231#include <asm/olpc.h>
232#include <asm/paravirt.h>
233#include <asm/reboot.h>
234#include <asm/nospec-branch.h>
235#include <asm/ibt.h>
236
237#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
238extern int (*console_blank_hook)(int);
239#endif
240
241/*
242 * Various options can be changed at boot time as follows:
243 * (We allow underscores for compatibility with the modules code)
244 * apm=on/off enable/disable APM
245 * [no-]allow[-_]ints allow interrupts during BIOS calls
246 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
247 * [no-]realmode[-_]power[-_]off switch to real mode before
248 * powering off
249 * [no-]debug log some debugging messages
250 * [no-]power[-_]off power off on shutdown
251 * [no-]smp Use apm even on an SMP box
252 * bounce[-_]interval=<n> number of ticks to ignore suspend
253 * bounces
254 * idle[-_]threshold=<n> System idle percentage above which to
255 * make APM BIOS idle calls. Set it to
256 * 100 to disable.
257 * idle[-_]period=<n> Period (in 1/100s of a second) over
258 * which the idle percentage is
259 * calculated.
260 */
261
262/* KNOWN PROBLEM MACHINES:
263 *
264 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
265 * [Confirmed by TI representative]
266 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
267 * [Confirmed by BIOS disassembly]
268 * [This may work now ...]
269 * P: Toshiba 1950S: battery life information only gets updated after resume
270 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
271 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
272 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
273 * Neale Banks <neale@lowendale.com.au> December 2000
274 *
275 * Legend: U = unusable with APM patches
276 * P = partially usable with APM patches
277 */
278
279/*
280 * Define as 1 to make the driver always call the APM BIOS busy
281 * routine even if the clock was not reported as slowed by the
282 * idle routine. Otherwise, define as 0.
283 */
284#define ALWAYS_CALL_BUSY 1
285
286/*
287 * Define to make the APM BIOS calls zero all data segment registers (so
288 * that an incorrect BIOS implementation will cause a kernel panic if it
289 * tries to write to arbitrary memory).
290 */
291#define APM_ZERO_SEGS
292
293#include <asm/apm.h>
294
295/*
296 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
297 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
298 * David Chen <chen@ctpa04.mit.edu>
299 */
300#undef INIT_TIMER_AFTER_SUSPEND
301
302#ifdef INIT_TIMER_AFTER_SUSPEND
303#include <linux/timex.h>
304#include <asm/io.h>
305#include <linux/delay.h>
306#endif
307
308/*
309 * Need to poll the APM BIOS every second
310 */
311#define APM_CHECK_TIMEOUT (HZ)
312
313/*
314 * Ignore suspend events for this amount of time after a resume
315 */
316#define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
317
318/*
319 * Maximum number of events stored
320 */
321#define APM_MAX_EVENTS 20
322
323/*
324 * The per-file APM data
325 */
326struct apm_user {
327 int magic;
328 struct apm_user *next;
329 unsigned int suser: 1;
330 unsigned int writer: 1;
331 unsigned int reader: 1;
332 unsigned int suspend_wait: 1;
333 int suspend_result;
334 int suspends_pending;
335 int standbys_pending;
336 int suspends_read;
337 int standbys_read;
338 int event_head;
339 int event_tail;
340 apm_event_t events[APM_MAX_EVENTS];
341};
342
343/*
344 * The magic number in apm_user
345 */
346#define APM_BIOS_MAGIC 0x4101
347
348/*
349 * idle percentage above which bios idle calls are done
350 */
351#ifdef CONFIG_APM_CPU_IDLE
352#define DEFAULT_IDLE_THRESHOLD 95
353#else
354#define DEFAULT_IDLE_THRESHOLD 100
355#endif
356#define DEFAULT_IDLE_PERIOD (100 / 3)
357
358static int apm_cpu_idle(struct cpuidle_device *dev,
359 struct cpuidle_driver *drv, int index);
360
361static struct cpuidle_driver apm_idle_driver = {
362 .name = "apm_idle",
363 .owner = THIS_MODULE,
364 .states = {
365 { /* entry 0 is for polling */ },
366 { /* entry 1 is for APM idle */
367 .name = "APM",
368 .desc = "APM idle",
369 .exit_latency = 250, /* WAG */
370 .target_residency = 500, /* WAG */
371 .enter = &apm_cpu_idle
372 },
373 },
374 .state_count = 2,
375};
376
377static struct cpuidle_device apm_cpuidle_device;
378
379/*
380 * Local variables
381 */
382__visible struct {
383 unsigned long offset;
384 unsigned short segment;
385} apm_bios_entry;
386static int clock_slowed;
387static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
388static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
389static int suspends_pending;
390static int standbys_pending;
391static int ignore_sys_suspend;
392static int ignore_normal_resume;
393static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
394
395static bool debug __read_mostly;
396static bool smp __read_mostly;
397static int apm_disabled = -1;
398#ifdef CONFIG_SMP
399static bool power_off;
400#else
401static bool power_off = 1;
402#endif
403static bool realmode_power_off;
404#ifdef CONFIG_APM_ALLOW_INTS
405static bool allow_ints = 1;
406#else
407static bool allow_ints;
408#endif
409static bool broken_psr;
410
411static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
412static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
413static struct apm_user *user_list;
414static DEFINE_SPINLOCK(user_list_lock);
415static DEFINE_MUTEX(apm_mutex);
416
417/*
418 * Set up a segment that references the real mode segment 0x40
419 * that extends up to the end of page zero (that we have reserved).
420 * This is for buggy BIOS's that refer to (real mode) segment 0x40
421 * even though they are called in protected mode.
422 */
423static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(DESC_DATA32_BIOS,
424 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
425
426static const char driver_version[] = "1.16ac"; /* no spaces */
427
428static struct task_struct *kapmd_task;
429
430/*
431 * APM event names taken from the APM 1.2 specification. These are
432 * the message codes that the BIOS uses to tell us about events
433 */
434static const char * const apm_event_name[] = {
435 "system standby",
436 "system suspend",
437 "normal resume",
438 "critical resume",
439 "low battery",
440 "power status change",
441 "update time",
442 "critical suspend",
443 "user standby",
444 "user suspend",
445 "system standby resume",
446 "capabilities change"
447};
448#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
449
450typedef struct lookup_t {
451 int key;
452 char *msg;
453} lookup_t;
454
455/*
456 * The BIOS returns a set of standard error codes in AX when the
457 * carry flag is set.
458 */
459
460static const lookup_t error_table[] = {
461/* N/A { APM_SUCCESS, "Operation succeeded" }, */
462 { APM_DISABLED, "Power management disabled" },
463 { APM_CONNECTED, "Real mode interface already connected" },
464 { APM_NOT_CONNECTED, "Interface not connected" },
465 { APM_16_CONNECTED, "16 bit interface already connected" },
466/* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
467 { APM_32_CONNECTED, "32 bit interface already connected" },
468 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
469 { APM_BAD_DEVICE, "Unrecognized device ID" },
470 { APM_BAD_PARAM, "Parameter out of range" },
471 { APM_NOT_ENGAGED, "Interface not engaged" },
472 { APM_BAD_FUNCTION, "Function not supported" },
473 { APM_RESUME_DISABLED, "Resume timer disabled" },
474 { APM_BAD_STATE, "Unable to enter requested state" },
475/* N/A { APM_NO_EVENTS, "No events pending" }, */
476 { APM_NO_ERROR, "BIOS did not set a return code" },
477 { APM_NOT_PRESENT, "No APM present" }
478};
479#define ERROR_COUNT ARRAY_SIZE(error_table)
480
481/**
482 * apm_error - display an APM error
483 * @str: information string
484 * @err: APM BIOS return code
485 *
486 * Write a meaningful log entry to the kernel log in the event of
487 * an APM error. Note that this also handles (negative) kernel errors.
488 */
489
490static void apm_error(char *str, int err)
491{
492 int i;
493
494 for (i = 0; i < ERROR_COUNT; i++)
495 if (error_table[i].key == err)
496 break;
497 if (i < ERROR_COUNT)
498 pr_notice("%s: %s\n", str, error_table[i].msg);
499 else if (err < 0)
500 pr_notice("%s: linux error code %i\n", str, err);
501 else
502 pr_notice("%s: unknown error code %#2.2x\n",
503 str, err);
504}
505
506/*
507 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
508 * apm_info.allow_ints, we are being really paranoid here! Not only
509 * are interrupts disabled, but all the segment registers (except SS)
510 * are saved and zeroed this means that if the BIOS tries to reference
511 * any data without explicitly loading the segment registers, the kernel
512 * will fault immediately rather than have some unforeseen circumstances
513 * for the rest of the kernel. And it will be very obvious! :-) Doing
514 * this depends on CS referring to the same physical memory as DS so that
515 * DS can be zeroed before the call. Unfortunately, we can't do anything
516 * about the stack segment/pointer. Also, we tell the compiler that
517 * everything could change.
518 *
519 * Also, we KNOW that for the non error case of apm_bios_call, there
520 * is no useful data returned in the low order 8 bits of eax.
521 */
522
523static inline unsigned long __apm_irq_save(void)
524{
525 unsigned long flags;
526 local_save_flags(flags);
527 if (apm_info.allow_ints) {
528 if (irqs_disabled_flags(flags))
529 local_irq_enable();
530 } else
531 local_irq_disable();
532
533 return flags;
534}
535
536#define apm_irq_save(flags) \
537 do { flags = __apm_irq_save(); } while (0)
538
539static inline void apm_irq_restore(unsigned long flags)
540{
541 if (irqs_disabled_flags(flags))
542 local_irq_disable();
543 else if (irqs_disabled())
544 local_irq_enable();
545}
546
547#ifdef APM_ZERO_SEGS
548# define APM_DECL_SEGS \
549 unsigned int saved_fs; unsigned int saved_gs;
550# define APM_DO_SAVE_SEGS \
551 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
552# define APM_DO_RESTORE_SEGS \
553 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
554#else
555# define APM_DECL_SEGS
556# define APM_DO_SAVE_SEGS
557# define APM_DO_RESTORE_SEGS
558#endif
559
560struct apm_bios_call {
561 u32 func;
562 /* In and out */
563 u32 ebx;
564 u32 ecx;
565 /* Out only */
566 u32 eax;
567 u32 edx;
568 u32 esi;
569
570 /* Error: -ENOMEM, or bits 8-15 of eax */
571 int err;
572};
573
574/**
575 * __apm_bios_call - Make an APM BIOS 32bit call
576 * @_call: pointer to struct apm_bios_call.
577 *
578 * Make an APM call using the 32bit protected mode interface. The
579 * caller is responsible for knowing if APM BIOS is configured and
580 * enabled. This call can disable interrupts for a long period of
581 * time on some laptops. The return value is in AH and the carry
582 * flag is loaded into AL. If there is an error, then the error
583 * code is returned in AH (bits 8-15 of eax) and this function
584 * returns non-zero.
585 *
586 * Note: this makes the call on the current CPU.
587 */
588static long __apm_bios_call(void *_call)
589{
590 APM_DECL_SEGS
591 unsigned long flags;
592 int cpu;
593 struct desc_struct save_desc_40;
594 struct desc_struct *gdt;
595 struct apm_bios_call *call = _call;
596 u64 ibt;
597
598 cpu = get_cpu();
599 BUG_ON(cpu != 0);
600 gdt = get_cpu_gdt_rw(cpu);
601 save_desc_40 = gdt[0x40 / 8];
602 gdt[0x40 / 8] = bad_bios_desc;
603
604 apm_irq_save(flags);
605 firmware_restrict_branch_speculation_start();
606 ibt = ibt_save(true);
607 APM_DO_SAVE_SEGS;
608 apm_bios_call_asm(call->func, call->ebx, call->ecx,
609 &call->eax, &call->ebx, &call->ecx, &call->edx,
610 &call->esi);
611 APM_DO_RESTORE_SEGS;
612 ibt_restore(ibt);
613 firmware_restrict_branch_speculation_end();
614 apm_irq_restore(flags);
615 gdt[0x40 / 8] = save_desc_40;
616 put_cpu();
617
618 return call->eax & 0xff;
619}
620
621/* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
622static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
623{
624 int ret;
625
626 /* Don't bother with work_on_cpu in the common case, so we don't
627 * have to worry about OOM or overhead. */
628 if (get_cpu() == 0) {
629 ret = fn(call);
630 put_cpu();
631 } else {
632 put_cpu();
633 ret = work_on_cpu(0, fn, call);
634 }
635
636 /* work_on_cpu can fail with -ENOMEM */
637 if (ret < 0)
638 call->err = ret;
639 else
640 call->err = (call->eax >> 8) & 0xff;
641
642 return ret;
643}
644
645/**
646 * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0)
647 * @call: the apm_bios_call registers.
648 *
649 * If there is an error, it is returned in @call.err.
650 */
651static int apm_bios_call(struct apm_bios_call *call)
652{
653 return on_cpu0(__apm_bios_call, call);
654}
655
656/**
657 * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
658 * @_call: pointer to struct apm_bios_call.
659 *
660 * Make a BIOS call that returns one value only, or just status.
661 * If there is an error, then the error code is returned in AH
662 * (bits 8-15 of eax) and this function returns non-zero (it can
663 * also return -ENOMEM). This is used for simpler BIOS operations.
664 * This call may hold interrupts off for a long time on some laptops.
665 *
666 * Note: this makes the call on the current CPU.
667 */
668static long __apm_bios_call_simple(void *_call)
669{
670 u8 error;
671 APM_DECL_SEGS
672 unsigned long flags;
673 int cpu;
674 struct desc_struct save_desc_40;
675 struct desc_struct *gdt;
676 struct apm_bios_call *call = _call;
677 u64 ibt;
678
679 cpu = get_cpu();
680 BUG_ON(cpu != 0);
681 gdt = get_cpu_gdt_rw(cpu);
682 save_desc_40 = gdt[0x40 / 8];
683 gdt[0x40 / 8] = bad_bios_desc;
684
685 apm_irq_save(flags);
686 firmware_restrict_branch_speculation_start();
687 ibt = ibt_save(true);
688 APM_DO_SAVE_SEGS;
689 error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
690 &call->eax);
691 APM_DO_RESTORE_SEGS;
692 ibt_restore(ibt);
693 firmware_restrict_branch_speculation_end();
694 apm_irq_restore(flags);
695 gdt[0x40 / 8] = save_desc_40;
696 put_cpu();
697 return error;
698}
699
700/**
701 * apm_bios_call_simple - make a simple APM BIOS 32bit call
702 * @func: APM function to invoke
703 * @ebx_in: EBX register value for BIOS call
704 * @ecx_in: ECX register value for BIOS call
705 * @eax: EAX register on return from the BIOS call
706 * @err: bits
707 *
708 * Make a BIOS call that returns one value only, or just status.
709 * If there is an error, then the error code is returned in @err
710 * and this function returns non-zero. This is used for simpler
711 * BIOS operations. This call may hold interrupts off for a long
712 * time on some laptops.
713 */
714static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
715 int *err)
716{
717 struct apm_bios_call call;
718 int ret;
719
720 call.func = func;
721 call.ebx = ebx_in;
722 call.ecx = ecx_in;
723
724 ret = on_cpu0(__apm_bios_call_simple, &call);
725 *eax = call.eax;
726 *err = call.err;
727 return ret;
728}
729
730/**
731 * apm_driver_version - APM driver version
732 * @val: loaded with the APM version on return
733 *
734 * Retrieve the APM version supported by the BIOS. This is only
735 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
736 * probably present.
737 *
738 * On entry val should point to a value indicating the APM driver
739 * version with the high byte being the major and the low byte the
740 * minor number both in BCD
741 *
742 * On return it will hold the BIOS revision supported in the
743 * same format.
744 */
745
746static int apm_driver_version(u_short *val)
747{
748 u32 eax;
749 int err;
750
751 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
752 return err;
753 *val = eax;
754 return APM_SUCCESS;
755}
756
757/**
758 * apm_get_event - get an APM event from the BIOS
759 * @event: pointer to the event
760 * @info: point to the event information
761 *
762 * The APM BIOS provides a polled information for event
763 * reporting. The BIOS expects to be polled at least every second
764 * when events are pending. When a message is found the caller should
765 * poll until no more messages are present. However, this causes
766 * problems on some laptops where a suspend event notification is
767 * not cleared until it is acknowledged.
768 *
769 * Additional information is returned in the info pointer, providing
770 * that APM 1.2 is in use. If no messages are pending the value 0x80
771 * is returned (No power management events pending).
772 */
773static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
774{
775 struct apm_bios_call call;
776
777 call.func = APM_FUNC_GET_EVENT;
778 call.ebx = call.ecx = 0;
779
780 if (apm_bios_call(&call))
781 return call.err;
782
783 *event = call.ebx;
784 if (apm_info.connection_version < 0x0102)
785 *info = ~0; /* indicate info not valid */
786 else
787 *info = call.ecx;
788 return APM_SUCCESS;
789}
790
791/**
792 * set_power_state - set the power management state
793 * @what: which items to transition
794 * @state: state to transition to
795 *
796 * Request an APM change of state for one or more system devices. The
797 * processor state must be transitioned last of all. what holds the
798 * class of device in the upper byte and the device number (0xFF for
799 * all) for the object to be transitioned.
800 *
801 * The state holds the state to transition to, which may in fact
802 * be an acceptance of a BIOS requested state change.
803 */
804
805static int set_power_state(u_short what, u_short state)
806{
807 u32 eax;
808 int err;
809
810 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
811 return err;
812 return APM_SUCCESS;
813}
814
815/**
816 * set_system_power_state - set system wide power state
817 * @state: which state to enter
818 *
819 * Transition the entire system into a new APM power state.
820 */
821
822static int set_system_power_state(u_short state)
823{
824 return set_power_state(APM_DEVICE_ALL, state);
825}
826
827/**
828 * apm_do_idle - perform power saving
829 *
830 * This function notifies the BIOS that the processor is (in the view
831 * of the OS) idle. It returns -1 in the event that the BIOS refuses
832 * to handle the idle request. On a success the function returns 1
833 * if the BIOS did clock slowing or 0 otherwise.
834 */
835
836static int apm_do_idle(void)
837{
838 u32 eax;
839 u8 ret = 0;
840 int idled = 0;
841 int err = 0;
842
843 if (!need_resched()) {
844 idled = 1;
845 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
846 }
847
848 if (!idled)
849 return 0;
850
851 if (ret) {
852 static unsigned long t;
853
854 /* This always fails on some SMP boards running UP kernels.
855 * Only report the failure the first 5 times.
856 */
857 if (++t < 5) {
858 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
859 t = jiffies;
860 }
861 return -1;
862 }
863 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
864 return clock_slowed;
865}
866
867/**
868 * apm_do_busy - inform the BIOS the CPU is busy
869 *
870 * Request that the BIOS brings the CPU back to full performance.
871 */
872
873static void apm_do_busy(void)
874{
875 u32 dummy;
876 int err;
877
878 if (clock_slowed || ALWAYS_CALL_BUSY) {
879 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
880 clock_slowed = 0;
881 }
882}
883
884/*
885 * If no process has really been interested in
886 * the CPU for some time, we want to call BIOS
887 * power management - we probably want
888 * to conserve power.
889 */
890#define IDLE_CALC_LIMIT (HZ * 100)
891#define IDLE_LEAKY_MAX 16
892
893/**
894 * apm_cpu_idle - cpu idling for APM capable Linux
895 *
896 * This is the idling function the kernel executes when APM is available. It
897 * tries to do BIOS powermanagement based on the average system idle time.
898 * Furthermore it calls the system default idle routine.
899 */
900
901static int apm_cpu_idle(struct cpuidle_device *dev,
902 struct cpuidle_driver *drv, int index)
903{
904 static int use_apm_idle; /* = 0 */
905 static unsigned int last_jiffies; /* = 0 */
906 static u64 last_stime; /* = 0 */
907 u64 stime, utime;
908
909 int apm_idle_done = 0;
910 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
911 unsigned int bucket;
912
913recalc:
914 task_cputime(current, &utime, &stime);
915 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
916 use_apm_idle = 0;
917 } else if (jiffies_since_last_check > idle_period) {
918 unsigned int idle_percentage;
919
920 idle_percentage = nsecs_to_jiffies(stime - last_stime);
921 idle_percentage *= 100;
922 idle_percentage /= jiffies_since_last_check;
923 use_apm_idle = (idle_percentage > idle_threshold);
924 if (apm_info.forbid_idle)
925 use_apm_idle = 0;
926 }
927
928 last_jiffies = jiffies;
929 last_stime = stime;
930
931 bucket = IDLE_LEAKY_MAX;
932
933 while (!need_resched()) {
934 if (use_apm_idle) {
935 unsigned int t;
936
937 t = jiffies;
938 switch (apm_do_idle()) {
939 case 0:
940 apm_idle_done = 1;
941 if (t != jiffies) {
942 if (bucket) {
943 bucket = IDLE_LEAKY_MAX;
944 continue;
945 }
946 } else if (bucket) {
947 bucket--;
948 continue;
949 }
950 break;
951 case 1:
952 apm_idle_done = 1;
953 break;
954 default: /* BIOS refused */
955 break;
956 }
957 }
958 default_idle();
959 local_irq_disable();
960 jiffies_since_last_check = jiffies - last_jiffies;
961 if (jiffies_since_last_check > idle_period)
962 goto recalc;
963 }
964
965 if (apm_idle_done)
966 apm_do_busy();
967
968 return index;
969}
970
971/**
972 * apm_power_off - ask the BIOS to power off
973 *
974 * Handle the power off sequence. This is the one piece of code we
975 * will execute even on SMP machines. In order to deal with BIOS
976 * bugs we support real mode APM BIOS power off calls. We also make
977 * the SMP call on CPU0 as some systems will only honour this call
978 * on their first cpu.
979 */
980
981static void apm_power_off(void)
982{
983 /* Some bioses don't like being called from CPU != 0 */
984 if (apm_info.realmode_power_off) {
985 set_cpus_allowed_ptr(current, cpumask_of(0));
986 machine_real_restart(MRR_APM);
987 } else {
988 (void)set_system_power_state(APM_STATE_OFF);
989 }
990}
991
992#ifdef CONFIG_APM_DO_ENABLE
993
994/**
995 * apm_enable_power_management - enable BIOS APM power management
996 * @enable: enable yes/no
997 *
998 * Enable or disable the APM BIOS power services.
999 */
1000
1001static int apm_enable_power_management(int enable)
1002{
1003 u32 eax;
1004 int err;
1005
1006 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1007 return APM_NOT_ENGAGED;
1008 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1009 enable, &eax, &err))
1010 return err;
1011 if (enable)
1012 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1013 else
1014 apm_info.bios.flags |= APM_BIOS_DISABLED;
1015 return APM_SUCCESS;
1016}
1017#endif
1018
1019/**
1020 * apm_get_power_status - get current power state
1021 * @status: returned status
1022 * @bat: battery info
1023 * @life: estimated life
1024 *
1025 * Obtain the current power status from the APM BIOS. We return a
1026 * status which gives the rough battery status, and current power
1027 * source. The bat value returned give an estimate as a percentage
1028 * of life and a status value for the battery. The estimated life
1029 * if reported is a lifetime in seconds/minutes at current power
1030 * consumption.
1031 */
1032
1033static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1034{
1035 struct apm_bios_call call;
1036
1037 call.func = APM_FUNC_GET_STATUS;
1038 call.ebx = APM_DEVICE_ALL;
1039 call.ecx = 0;
1040
1041 if (apm_info.get_power_status_broken)
1042 return APM_32_UNSUPPORTED;
1043 if (apm_bios_call(&call)) {
1044 if (!call.err)
1045 return APM_NO_ERROR;
1046 return call.err;
1047 }
1048 *status = call.ebx;
1049 *bat = call.ecx;
1050 if (apm_info.get_power_status_swabinminutes) {
1051 *life = swab16((u16)call.edx);
1052 *life |= 0x8000;
1053 } else
1054 *life = call.edx;
1055 return APM_SUCCESS;
1056}
1057
1058/**
1059 * apm_engage_power_management - enable PM on a device
1060 * @device: identity of device
1061 * @enable: on/off
1062 *
1063 * Activate or deactivate power management on either a specific device
1064 * or the entire system (%APM_DEVICE_ALL).
1065 */
1066
1067static int apm_engage_power_management(u_short device, int enable)
1068{
1069 u32 eax;
1070 int err;
1071
1072 if ((enable == 0) && (device == APM_DEVICE_ALL)
1073 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1074 return APM_DISABLED;
1075 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1076 &eax, &err))
1077 return err;
1078 if (device == APM_DEVICE_ALL) {
1079 if (enable)
1080 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1081 else
1082 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1083 }
1084 return APM_SUCCESS;
1085}
1086
1087#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1088
1089/**
1090 * apm_console_blank - blank the display
1091 * @blank: on/off
1092 *
1093 * Attempt to blank the console, firstly by blanking just video device
1094 * zero, and if that fails (some BIOSes don't support it) then it blanks
1095 * all video devices. Typically the BIOS will do laptop backlight and
1096 * monitor powerdown for us.
1097 */
1098
1099static int apm_console_blank(int blank)
1100{
1101 int error = APM_NOT_ENGAGED; /* silence gcc */
1102 int i;
1103 u_short state;
1104 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1105
1106 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1107
1108 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1109 error = set_power_state(dev[i], state);
1110
1111 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1112 return 1;
1113
1114 if (error == APM_NOT_ENGAGED)
1115 break;
1116 }
1117
1118 if (error == APM_NOT_ENGAGED) {
1119 static int tried;
1120 int eng_error;
1121 if (tried++ == 0) {
1122 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1123 if (eng_error) {
1124 apm_error("set display", error);
1125 apm_error("engage interface", eng_error);
1126 return 0;
1127 } else
1128 return apm_console_blank(blank);
1129 }
1130 }
1131 apm_error("set display", error);
1132 return 0;
1133}
1134#endif
1135
1136static int queue_empty(struct apm_user *as)
1137{
1138 return as->event_head == as->event_tail;
1139}
1140
1141static apm_event_t get_queued_event(struct apm_user *as)
1142{
1143 if (++as->event_tail >= APM_MAX_EVENTS)
1144 as->event_tail = 0;
1145 return as->events[as->event_tail];
1146}
1147
1148static void queue_event(apm_event_t event, struct apm_user *sender)
1149{
1150 struct apm_user *as;
1151
1152 spin_lock(&user_list_lock);
1153 if (user_list == NULL)
1154 goto out;
1155 for (as = user_list; as != NULL; as = as->next) {
1156 if ((as == sender) || (!as->reader))
1157 continue;
1158 if (++as->event_head >= APM_MAX_EVENTS)
1159 as->event_head = 0;
1160
1161 if (as->event_head == as->event_tail) {
1162 static int notified;
1163
1164 if (notified++ == 0)
1165 pr_err("an event queue overflowed\n");
1166 if (++as->event_tail >= APM_MAX_EVENTS)
1167 as->event_tail = 0;
1168 }
1169 as->events[as->event_head] = event;
1170 if (!as->suser || !as->writer)
1171 continue;
1172 switch (event) {
1173 case APM_SYS_SUSPEND:
1174 case APM_USER_SUSPEND:
1175 as->suspends_pending++;
1176 suspends_pending++;
1177 break;
1178
1179 case APM_SYS_STANDBY:
1180 case APM_USER_STANDBY:
1181 as->standbys_pending++;
1182 standbys_pending++;
1183 break;
1184 }
1185 }
1186 wake_up_interruptible(&apm_waitqueue);
1187out:
1188 spin_unlock(&user_list_lock);
1189}
1190
1191static void reinit_timer(void)
1192{
1193#ifdef INIT_TIMER_AFTER_SUSPEND
1194 unsigned long flags;
1195
1196 raw_spin_lock_irqsave(&i8253_lock, flags);
1197 /* set the clock to HZ */
1198 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1199 udelay(10);
1200 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1201 udelay(10);
1202 outb_p(LATCH >> 8, PIT_CH0); /* MSB */
1203 udelay(10);
1204 raw_spin_unlock_irqrestore(&i8253_lock, flags);
1205#endif
1206}
1207
1208static int suspend(int vetoable)
1209{
1210 int err;
1211 struct apm_user *as;
1212
1213 dpm_suspend_start(PMSG_SUSPEND);
1214 dpm_suspend_end(PMSG_SUSPEND);
1215
1216 local_irq_disable();
1217 syscore_suspend();
1218
1219 local_irq_enable();
1220
1221 save_processor_state();
1222 err = set_system_power_state(APM_STATE_SUSPEND);
1223 ignore_normal_resume = 1;
1224 restore_processor_state();
1225
1226 local_irq_disable();
1227 reinit_timer();
1228
1229 if (err == APM_NO_ERROR)
1230 err = APM_SUCCESS;
1231 if (err != APM_SUCCESS)
1232 apm_error("suspend", err);
1233 err = (err == APM_SUCCESS) ? 0 : -EIO;
1234
1235 syscore_resume();
1236 local_irq_enable();
1237
1238 dpm_resume_start(PMSG_RESUME);
1239 dpm_resume_end(PMSG_RESUME);
1240
1241 queue_event(APM_NORMAL_RESUME, NULL);
1242 spin_lock(&user_list_lock);
1243 for (as = user_list; as != NULL; as = as->next) {
1244 as->suspend_wait = 0;
1245 as->suspend_result = err;
1246 }
1247 spin_unlock(&user_list_lock);
1248 wake_up_interruptible(&apm_suspend_waitqueue);
1249 return err;
1250}
1251
1252static void standby(void)
1253{
1254 int err;
1255
1256 dpm_suspend_end(PMSG_SUSPEND);
1257
1258 local_irq_disable();
1259 syscore_suspend();
1260 local_irq_enable();
1261
1262 err = set_system_power_state(APM_STATE_STANDBY);
1263 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1264 apm_error("standby", err);
1265
1266 local_irq_disable();
1267 syscore_resume();
1268 local_irq_enable();
1269
1270 dpm_resume_start(PMSG_RESUME);
1271}
1272
1273static apm_event_t get_event(void)
1274{
1275 int error;
1276 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1277 apm_eventinfo_t info;
1278
1279 static int notified;
1280
1281 /* we don't use the eventinfo */
1282 error = apm_get_event(&event, &info);
1283 if (error == APM_SUCCESS)
1284 return event;
1285
1286 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1287 apm_error("get_event", error);
1288
1289 return 0;
1290}
1291
1292static void check_events(void)
1293{
1294 apm_event_t event;
1295 static unsigned long last_resume;
1296 static int ignore_bounce;
1297
1298 while ((event = get_event()) != 0) {
1299 if (debug) {
1300 if (event <= NR_APM_EVENT_NAME)
1301 printk(KERN_DEBUG "apm: received %s notify\n",
1302 apm_event_name[event - 1]);
1303 else
1304 printk(KERN_DEBUG "apm: received unknown "
1305 "event 0x%02x\n", event);
1306 }
1307 if (ignore_bounce
1308 && (time_after(jiffies, last_resume + bounce_interval)))
1309 ignore_bounce = 0;
1310
1311 switch (event) {
1312 case APM_SYS_STANDBY:
1313 case APM_USER_STANDBY:
1314 queue_event(event, NULL);
1315 if (standbys_pending <= 0)
1316 standby();
1317 break;
1318
1319 case APM_USER_SUSPEND:
1320#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1321 if (apm_info.connection_version > 0x100)
1322 set_system_power_state(APM_STATE_REJECT);
1323 break;
1324#endif
1325 case APM_SYS_SUSPEND:
1326 if (ignore_bounce) {
1327 if (apm_info.connection_version > 0x100)
1328 set_system_power_state(APM_STATE_REJECT);
1329 break;
1330 }
1331 /*
1332 * If we are already processing a SUSPEND,
1333 * then further SUSPEND events from the BIOS
1334 * will be ignored. We also return here to
1335 * cope with the fact that the Thinkpads keep
1336 * sending a SUSPEND event until something else
1337 * happens!
1338 */
1339 if (ignore_sys_suspend)
1340 return;
1341 ignore_sys_suspend = 1;
1342 queue_event(event, NULL);
1343 if (suspends_pending <= 0)
1344 (void) suspend(1);
1345 break;
1346
1347 case APM_NORMAL_RESUME:
1348 case APM_CRITICAL_RESUME:
1349 case APM_STANDBY_RESUME:
1350 ignore_sys_suspend = 0;
1351 last_resume = jiffies;
1352 ignore_bounce = 1;
1353 if ((event != APM_NORMAL_RESUME)
1354 || (ignore_normal_resume == 0)) {
1355 dpm_resume_end(PMSG_RESUME);
1356 queue_event(event, NULL);
1357 }
1358 ignore_normal_resume = 0;
1359 break;
1360
1361 case APM_CAPABILITY_CHANGE:
1362 case APM_LOW_BATTERY:
1363 case APM_POWER_STATUS_CHANGE:
1364 queue_event(event, NULL);
1365 /* If needed, notify drivers here */
1366 break;
1367
1368 case APM_UPDATE_TIME:
1369 break;
1370
1371 case APM_CRITICAL_SUSPEND:
1372 /*
1373 * We are not allowed to reject a critical suspend.
1374 */
1375 (void)suspend(0);
1376 break;
1377 }
1378 }
1379}
1380
1381static void apm_event_handler(void)
1382{
1383 static int pending_count = 4;
1384 int err;
1385
1386 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1387 if ((apm_info.connection_version > 0x100) &&
1388 (pending_count-- <= 0)) {
1389 pending_count = 4;
1390 if (debug)
1391 printk(KERN_DEBUG "apm: setting state busy\n");
1392 err = set_system_power_state(APM_STATE_BUSY);
1393 if (err)
1394 apm_error("busy", err);
1395 }
1396 } else
1397 pending_count = 4;
1398 check_events();
1399}
1400
1401/*
1402 * This is the APM thread main loop.
1403 */
1404
1405static void apm_mainloop(void)
1406{
1407 DECLARE_WAITQUEUE(wait, current);
1408
1409 add_wait_queue(&apm_waitqueue, &wait);
1410 set_current_state(TASK_INTERRUPTIBLE);
1411 for (;;) {
1412 schedule_timeout(APM_CHECK_TIMEOUT);
1413 if (kthread_should_stop())
1414 break;
1415 /*
1416 * Ok, check all events, check for idle (and mark us sleeping
1417 * so as not to count towards the load average)..
1418 */
1419 set_current_state(TASK_INTERRUPTIBLE);
1420 apm_event_handler();
1421 }
1422 remove_wait_queue(&apm_waitqueue, &wait);
1423}
1424
1425static int check_apm_user(struct apm_user *as, const char *func)
1426{
1427 if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1428 pr_err("%s passed bad filp\n", func);
1429 return 1;
1430 }
1431 return 0;
1432}
1433
1434static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1435{
1436 struct apm_user *as;
1437 int i;
1438 apm_event_t event;
1439
1440 as = fp->private_data;
1441 if (check_apm_user(as, "read"))
1442 return -EIO;
1443 if ((int)count < sizeof(apm_event_t))
1444 return -EINVAL;
1445 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1446 return -EAGAIN;
1447 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1448 i = count;
1449 while ((i >= sizeof(event)) && !queue_empty(as)) {
1450 event = get_queued_event(as);
1451 if (copy_to_user(buf, &event, sizeof(event))) {
1452 if (i < count)
1453 break;
1454 return -EFAULT;
1455 }
1456 switch (event) {
1457 case APM_SYS_SUSPEND:
1458 case APM_USER_SUSPEND:
1459 as->suspends_read++;
1460 break;
1461
1462 case APM_SYS_STANDBY:
1463 case APM_USER_STANDBY:
1464 as->standbys_read++;
1465 break;
1466 }
1467 buf += sizeof(event);
1468 i -= sizeof(event);
1469 }
1470 if (i < count)
1471 return count - i;
1472 if (signal_pending(current))
1473 return -ERESTARTSYS;
1474 return 0;
1475}
1476
1477static __poll_t do_poll(struct file *fp, poll_table *wait)
1478{
1479 struct apm_user *as;
1480
1481 as = fp->private_data;
1482 if (check_apm_user(as, "poll"))
1483 return 0;
1484 poll_wait(fp, &apm_waitqueue, wait);
1485 if (!queue_empty(as))
1486 return EPOLLIN | EPOLLRDNORM;
1487 return 0;
1488}
1489
1490static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1491{
1492 struct apm_user *as;
1493 int ret;
1494
1495 as = filp->private_data;
1496 if (check_apm_user(as, "ioctl"))
1497 return -EIO;
1498 if (!as->suser || !as->writer)
1499 return -EPERM;
1500 switch (cmd) {
1501 case APM_IOC_STANDBY:
1502 mutex_lock(&apm_mutex);
1503 if (as->standbys_read > 0) {
1504 as->standbys_read--;
1505 as->standbys_pending--;
1506 standbys_pending--;
1507 } else
1508 queue_event(APM_USER_STANDBY, as);
1509 if (standbys_pending <= 0)
1510 standby();
1511 mutex_unlock(&apm_mutex);
1512 break;
1513 case APM_IOC_SUSPEND:
1514 mutex_lock(&apm_mutex);
1515 if (as->suspends_read > 0) {
1516 as->suspends_read--;
1517 as->suspends_pending--;
1518 suspends_pending--;
1519 } else
1520 queue_event(APM_USER_SUSPEND, as);
1521 if (suspends_pending <= 0) {
1522 ret = suspend(1);
1523 mutex_unlock(&apm_mutex);
1524 } else {
1525 as->suspend_wait = 1;
1526 mutex_unlock(&apm_mutex);
1527 wait_event_interruptible(apm_suspend_waitqueue,
1528 as->suspend_wait == 0);
1529 ret = as->suspend_result;
1530 }
1531 return ret;
1532 default:
1533 return -ENOTTY;
1534 }
1535 return 0;
1536}
1537
1538static int do_release(struct inode *inode, struct file *filp)
1539{
1540 struct apm_user *as;
1541
1542 as = filp->private_data;
1543 if (check_apm_user(as, "release"))
1544 return 0;
1545 filp->private_data = NULL;
1546 if (as->standbys_pending > 0) {
1547 standbys_pending -= as->standbys_pending;
1548 if (standbys_pending <= 0)
1549 standby();
1550 }
1551 if (as->suspends_pending > 0) {
1552 suspends_pending -= as->suspends_pending;
1553 if (suspends_pending <= 0)
1554 (void) suspend(1);
1555 }
1556 spin_lock(&user_list_lock);
1557 if (user_list == as)
1558 user_list = as->next;
1559 else {
1560 struct apm_user *as1;
1561
1562 for (as1 = user_list;
1563 (as1 != NULL) && (as1->next != as);
1564 as1 = as1->next)
1565 ;
1566 if (as1 == NULL)
1567 pr_err("filp not in user list\n");
1568 else
1569 as1->next = as->next;
1570 }
1571 spin_unlock(&user_list_lock);
1572 kfree(as);
1573 return 0;
1574}
1575
1576static int do_open(struct inode *inode, struct file *filp)
1577{
1578 struct apm_user *as;
1579
1580 as = kmalloc(sizeof(*as), GFP_KERNEL);
1581 if (as == NULL)
1582 return -ENOMEM;
1583
1584 as->magic = APM_BIOS_MAGIC;
1585 as->event_tail = as->event_head = 0;
1586 as->suspends_pending = as->standbys_pending = 0;
1587 as->suspends_read = as->standbys_read = 0;
1588 /*
1589 * XXX - this is a tiny bit broken, when we consider BSD
1590 * process accounting. If the device is opened by root, we
1591 * instantly flag that we used superuser privs. Who knows,
1592 * we might close the device immediately without doing a
1593 * privileged operation -- cevans
1594 */
1595 as->suser = capable(CAP_SYS_ADMIN);
1596 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1597 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1598 spin_lock(&user_list_lock);
1599 as->next = user_list;
1600 user_list = as;
1601 spin_unlock(&user_list_lock);
1602 filp->private_data = as;
1603 return 0;
1604}
1605
1606#ifdef CONFIG_PROC_FS
1607static int proc_apm_show(struct seq_file *m, void *v)
1608{
1609 unsigned short bx;
1610 unsigned short cx;
1611 unsigned short dx;
1612 int error;
1613 unsigned short ac_line_status = 0xff;
1614 unsigned short battery_status = 0xff;
1615 unsigned short battery_flag = 0xff;
1616 int percentage = -1;
1617 int time_units = -1;
1618 char *units = "?";
1619
1620 if ((num_online_cpus() == 1) &&
1621 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1622 ac_line_status = (bx >> 8) & 0xff;
1623 battery_status = bx & 0xff;
1624 if ((cx & 0xff) != 0xff)
1625 percentage = cx & 0xff;
1626
1627 if (apm_info.connection_version > 0x100) {
1628 battery_flag = (cx >> 8) & 0xff;
1629 if (dx != 0xffff) {
1630 units = (dx & 0x8000) ? "min" : "sec";
1631 time_units = dx & 0x7fff;
1632 }
1633 }
1634 }
1635 /* Arguments, with symbols from linux/apm_bios.h. Information is
1636 from the Get Power Status (0x0a) call unless otherwise noted.
1637
1638 0) Linux driver version (this will change if format changes)
1639 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1640 2) APM flags from APM Installation Check (0x00):
1641 bit 0: APM_16_BIT_SUPPORT
1642 bit 1: APM_32_BIT_SUPPORT
1643 bit 2: APM_IDLE_SLOWS_CLOCK
1644 bit 3: APM_BIOS_DISABLED
1645 bit 4: APM_BIOS_DISENGAGED
1646 3) AC line status
1647 0x00: Off-line
1648 0x01: On-line
1649 0x02: On backup power (BIOS >= 1.1 only)
1650 0xff: Unknown
1651 4) Battery status
1652 0x00: High
1653 0x01: Low
1654 0x02: Critical
1655 0x03: Charging
1656 0x04: Selected battery not present (BIOS >= 1.2 only)
1657 0xff: Unknown
1658 5) Battery flag
1659 bit 0: High
1660 bit 1: Low
1661 bit 2: Critical
1662 bit 3: Charging
1663 bit 7: No system battery
1664 0xff: Unknown
1665 6) Remaining battery life (percentage of charge):
1666 0-100: valid
1667 -1: Unknown
1668 7) Remaining battery life (time units):
1669 Number of remaining minutes or seconds
1670 -1: Unknown
1671 8) min = minutes; sec = seconds */
1672
1673 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1674 driver_version,
1675 (apm_info.bios.version >> 8) & 0xff,
1676 apm_info.bios.version & 0xff,
1677 apm_info.bios.flags,
1678 ac_line_status,
1679 battery_status,
1680 battery_flag,
1681 percentage,
1682 time_units,
1683 units);
1684 return 0;
1685}
1686#endif
1687
1688static int apm(void *unused)
1689{
1690 unsigned short bx;
1691 unsigned short cx;
1692 unsigned short dx;
1693 int error;
1694 char *power_stat;
1695 char *bat_stat;
1696
1697 /* 2002/08/01 - WT
1698 * This is to avoid random crashes at boot time during initialization
1699 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1700 * Some bioses don't like being called from CPU != 0.
1701 * Method suggested by Ingo Molnar.
1702 */
1703 set_cpus_allowed_ptr(current, cpumask_of(0));
1704 BUG_ON(smp_processor_id() != 0);
1705
1706 if (apm_info.connection_version == 0) {
1707 apm_info.connection_version = apm_info.bios.version;
1708 if (apm_info.connection_version > 0x100) {
1709 /*
1710 * We only support BIOSs up to version 1.2
1711 */
1712 if (apm_info.connection_version > 0x0102)
1713 apm_info.connection_version = 0x0102;
1714 error = apm_driver_version(&apm_info.connection_version);
1715 if (error != APM_SUCCESS) {
1716 apm_error("driver version", error);
1717 /* Fall back to an APM 1.0 connection. */
1718 apm_info.connection_version = 0x100;
1719 }
1720 }
1721 }
1722
1723 if (debug)
1724 printk(KERN_INFO "apm: Connection version %d.%d\n",
1725 (apm_info.connection_version >> 8) & 0xff,
1726 apm_info.connection_version & 0xff);
1727
1728#ifdef CONFIG_APM_DO_ENABLE
1729 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1730 /*
1731 * This call causes my NEC UltraLite Versa 33/C to hang if it
1732 * is booted with PM disabled but not in the docking station.
1733 * Unfortunate ...
1734 */
1735 error = apm_enable_power_management(1);
1736 if (error) {
1737 apm_error("enable power management", error);
1738 return -1;
1739 }
1740 }
1741#endif
1742
1743 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1744 && (apm_info.connection_version > 0x0100)) {
1745 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1746 if (error) {
1747 apm_error("engage power management", error);
1748 return -1;
1749 }
1750 }
1751
1752 if (debug && (num_online_cpus() == 1 || smp)) {
1753 error = apm_get_power_status(&bx, &cx, &dx);
1754 if (error)
1755 printk(KERN_INFO "apm: power status not available\n");
1756 else {
1757 switch ((bx >> 8) & 0xff) {
1758 case 0:
1759 power_stat = "off line";
1760 break;
1761 case 1:
1762 power_stat = "on line";
1763 break;
1764 case 2:
1765 power_stat = "on backup power";
1766 break;
1767 default:
1768 power_stat = "unknown";
1769 break;
1770 }
1771 switch (bx & 0xff) {
1772 case 0:
1773 bat_stat = "high";
1774 break;
1775 case 1:
1776 bat_stat = "low";
1777 break;
1778 case 2:
1779 bat_stat = "critical";
1780 break;
1781 case 3:
1782 bat_stat = "charging";
1783 break;
1784 default:
1785 bat_stat = "unknown";
1786 break;
1787 }
1788 printk(KERN_INFO
1789 "apm: AC %s, battery status %s, battery life ",
1790 power_stat, bat_stat);
1791 if ((cx & 0xff) == 0xff)
1792 printk("unknown\n");
1793 else
1794 printk("%d%%\n", cx & 0xff);
1795 if (apm_info.connection_version > 0x100) {
1796 printk(KERN_INFO
1797 "apm: battery flag 0x%02x, battery life ",
1798 (cx >> 8) & 0xff);
1799 if (dx == 0xffff)
1800 printk("unknown\n");
1801 else
1802 printk("%d %s\n", dx & 0x7fff,
1803 (dx & 0x8000) ?
1804 "minutes" : "seconds");
1805 }
1806 }
1807 }
1808
1809 /* Install our power off handler.. */
1810 if (power_off)
1811 pm_power_off = apm_power_off;
1812
1813 if (num_online_cpus() == 1 || smp) {
1814#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1815 console_blank_hook = apm_console_blank;
1816#endif
1817 apm_mainloop();
1818#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1819 console_blank_hook = NULL;
1820#endif
1821 }
1822
1823 return 0;
1824}
1825
1826#ifndef MODULE
1827static int __init apm_setup(char *str)
1828{
1829 int invert;
1830
1831 while ((str != NULL) && (*str != '\0')) {
1832 if (strncmp(str, "off", 3) == 0)
1833 apm_disabled = 1;
1834 if (strncmp(str, "on", 2) == 0)
1835 apm_disabled = 0;
1836 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1837 (strncmp(str, "bounce_interval=", 16) == 0))
1838 bounce_interval = simple_strtol(str + 16, NULL, 0);
1839 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1840 (strncmp(str, "idle_threshold=", 15) == 0))
1841 idle_threshold = simple_strtol(str + 15, NULL, 0);
1842 if ((strncmp(str, "idle-period=", 12) == 0) ||
1843 (strncmp(str, "idle_period=", 12) == 0))
1844 idle_period = simple_strtol(str + 12, NULL, 0);
1845 invert = (strncmp(str, "no-", 3) == 0) ||
1846 (strncmp(str, "no_", 3) == 0);
1847 if (invert)
1848 str += 3;
1849 if (strncmp(str, "debug", 5) == 0)
1850 debug = !invert;
1851 if ((strncmp(str, "power-off", 9) == 0) ||
1852 (strncmp(str, "power_off", 9) == 0))
1853 power_off = !invert;
1854 if (strncmp(str, "smp", 3) == 0) {
1855 smp = !invert;
1856 idle_threshold = 100;
1857 }
1858 if ((strncmp(str, "allow-ints", 10) == 0) ||
1859 (strncmp(str, "allow_ints", 10) == 0))
1860 apm_info.allow_ints = !invert;
1861 if ((strncmp(str, "broken-psr", 10) == 0) ||
1862 (strncmp(str, "broken_psr", 10) == 0))
1863 apm_info.get_power_status_broken = !invert;
1864 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1865 (strncmp(str, "realmode_power_off", 18) == 0))
1866 apm_info.realmode_power_off = !invert;
1867 str = strchr(str, ',');
1868 if (str != NULL)
1869 str += strspn(str, ", \t");
1870 }
1871 return 1;
1872}
1873
1874__setup("apm=", apm_setup);
1875#endif
1876
1877static const struct file_operations apm_bios_fops = {
1878 .owner = THIS_MODULE,
1879 .read = do_read,
1880 .poll = do_poll,
1881 .unlocked_ioctl = do_ioctl,
1882 .open = do_open,
1883 .release = do_release,
1884 .llseek = noop_llseek,
1885};
1886
1887static struct miscdevice apm_device = {
1888 APM_MINOR_DEV,
1889 "apm_bios",
1890 &apm_bios_fops
1891};
1892
1893
1894/* Simple "print if true" callback */
1895static int __init print_if_true(const struct dmi_system_id *d)
1896{
1897 printk("%s\n", d->ident);
1898 return 0;
1899}
1900
1901/*
1902 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1903 * disabled before the suspend. Linux used to get terribly confused by that.
1904 */
1905static int __init broken_ps2_resume(const struct dmi_system_id *d)
1906{
1907 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1908 "workaround hopefully not needed.\n", d->ident);
1909 return 0;
1910}
1911
1912/* Some bioses have a broken protected mode poweroff and need to use realmode */
1913static int __init set_realmode_power_off(const struct dmi_system_id *d)
1914{
1915 if (apm_info.realmode_power_off == 0) {
1916 apm_info.realmode_power_off = 1;
1917 printk(KERN_INFO "%s bios detected. "
1918 "Using realmode poweroff only.\n", d->ident);
1919 }
1920 return 0;
1921}
1922
1923/* Some laptops require interrupts to be enabled during APM calls */
1924static int __init set_apm_ints(const struct dmi_system_id *d)
1925{
1926 if (apm_info.allow_ints == 0) {
1927 apm_info.allow_ints = 1;
1928 printk(KERN_INFO "%s machine detected. "
1929 "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(const struct dmi_system_id *d)
1936{
1937 if (apm_info.disabled == 0) {
1938 apm_info.disabled = 1;
1939 printk(KERN_INFO "%s machine detected. "
1940 "Disabling APM.\n", d->ident);
1941 }
1942 return 0;
1943}
1944
1945static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1946{
1947 if (apm_info.disabled == 0) {
1948 apm_info.disabled = 1;
1949 printk(KERN_INFO "%s machine detected. "
1950 "Disabling APM.\n", d->ident);
1951 printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
1952 printk(KERN_INFO "download from support.intel.com\n");
1953 }
1954 return 0;
1955}
1956
1957/* Some APM bioses hang on APM idle calls */
1958static int __init apm_likes_to_melt(const struct dmi_system_id *d)
1959{
1960 if (apm_info.forbid_idle == 0) {
1961 apm_info.forbid_idle = 1;
1962 printk(KERN_INFO "%s machine detected. "
1963 "Disabling APM idle calls.\n", d->ident);
1964 }
1965 return 0;
1966}
1967
1968/*
1969 * Check for clue free BIOS implementations who use
1970 * the following QA technique
1971 *
1972 * [ Write BIOS Code ]<------
1973 * | ^
1974 * < Does it Compile >----N--
1975 * |Y ^
1976 * < Does it Boot Win98 >-N--
1977 * |Y
1978 * [Ship It]
1979 *
1980 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
1981 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
1982 */
1983static int __init broken_apm_power(const struct dmi_system_id *d)
1984{
1985 apm_info.get_power_status_broken = 1;
1986 printk(KERN_WARNING "BIOS strings suggest APM bugs, "
1987 "disabling power status reporting.\n");
1988 return 0;
1989}
1990
1991/*
1992 * This bios swaps the APM minute reporting bytes over (Many sony laptops
1993 * have this problem).
1994 */
1995static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
1996{
1997 apm_info.get_power_status_swabinminutes = 1;
1998 printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
1999 "in minutes and wrong byte order.\n");
2000 return 0;
2001}
2002
2003static const struct dmi_system_id apm_dmi_table[] __initconst = {
2004 {
2005 print_if_true,
2006 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2007 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2008 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2009 },
2010 { /* Handle problems with APM on the C600 */
2011 broken_ps2_resume, "Dell Latitude C600",
2012 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2013 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2014 },
2015 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2016 set_apm_ints, "Dell Latitude",
2017 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2018 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2019 },
2020 { /* APM crashes */
2021 apm_is_horked, "Dell Inspiron 2500",
2022 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2023 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2024 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2025 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2026 },
2027 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2028 set_apm_ints, "Dell Inspiron", {
2029 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2030 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2031 },
2032 { /* Handle problems with APM on Inspiron 5000e */
2033 broken_apm_power, "Dell Inspiron 5000e",
2034 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2035 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2036 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2037 },
2038 { /* Handle problems with APM on Inspiron 2500 */
2039 broken_apm_power, "Dell Inspiron 2500",
2040 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2041 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2042 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2043 },
2044 { /* APM crashes */
2045 apm_is_horked, "Dell Dimension 4100",
2046 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2047 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2048 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2049 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2050 },
2051 { /* Allow interrupts during suspend on Compaq Laptops*/
2052 set_apm_ints, "Compaq 12XL125",
2053 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2054 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2055 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2056 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2057 },
2058 { /* Allow interrupts during APM or the clock goes slow */
2059 set_apm_ints, "ASUSTeK",
2060 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2061 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2062 },
2063 { /* APM blows on shutdown */
2064 apm_is_horked, "ABIT KX7-333[R]",
2065 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2066 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2067 },
2068 { /* APM crashes */
2069 apm_is_horked, "Trigem Delhi3",
2070 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2071 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2072 },
2073 { /* APM crashes */
2074 apm_is_horked, "Fujitsu-Siemens",
2075 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2076 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2077 },
2078 { /* APM crashes */
2079 apm_is_horked_d850md, "Intel D850MD",
2080 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2081 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2082 },
2083 { /* APM crashes */
2084 apm_is_horked, "Intel D810EMO",
2085 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2086 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2087 },
2088 { /* APM crashes */
2089 apm_is_horked, "Dell XPS-Z",
2090 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2091 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2092 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2093 },
2094 { /* APM crashes */
2095 apm_is_horked, "Sharp PC-PJ/AX",
2096 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2097 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2098 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2099 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2100 },
2101 { /* APM crashes */
2102 apm_is_horked, "Dell Inspiron 2500",
2103 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2104 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2105 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2106 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2107 },
2108 { /* APM idle hangs */
2109 apm_likes_to_melt, "Jabil AMD",
2110 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2111 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2112 },
2113 { /* APM idle hangs */
2114 apm_likes_to_melt, "AMI Bios",
2115 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2116 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2117 },
2118 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2119 swab_apm_power_in_minutes, "Sony VAIO",
2120 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2121 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2122 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2123 },
2124 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2125 swab_apm_power_in_minutes, "Sony VAIO",
2126 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2127 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2128 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2129 },
2130 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2131 swab_apm_power_in_minutes, "Sony VAIO",
2132 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2133 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2134 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2135 },
2136 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2137 swab_apm_power_in_minutes, "Sony VAIO",
2138 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2139 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2140 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2141 },
2142 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2143 swab_apm_power_in_minutes, "Sony VAIO",
2144 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2145 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2146 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2147 },
2148 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2149 swab_apm_power_in_minutes, "Sony VAIO",
2150 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2151 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2152 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2153 },
2154 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2155 swab_apm_power_in_minutes, "Sony VAIO",
2156 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2157 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2158 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2159 },
2160 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2161 swab_apm_power_in_minutes, "Sony VAIO",
2162 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2163 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2164 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2165 },
2166 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2167 swab_apm_power_in_minutes, "Sony VAIO",
2168 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2169 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2170 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2171 },
2172 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2173 swab_apm_power_in_minutes, "Sony VAIO",
2174 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2175 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2176 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2177 },
2178
2179 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2180 swab_apm_power_in_minutes, "Sony VAIO",
2181 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2182 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2183 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2184 },
2185 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2186 swab_apm_power_in_minutes, "Sony VAIO",
2187 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2188 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2189 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2190 },
2191 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2192 swab_apm_power_in_minutes, "Sony VAIO",
2193 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2194 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2195 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2196 },
2197 { /* broken PM poweroff bios */
2198 set_realmode_power_off, "Award Software v4.60 PGMA",
2199 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2200 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2201 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2202 },
2203
2204 /* Generic per vendor APM settings */
2205
2206 { /* Allow interrupts during suspend on IBM laptops */
2207 set_apm_ints, "IBM",
2208 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2209 },
2210
2211 { }
2212};
2213
2214/*
2215 * Just start the APM thread. We do NOT want to do APM BIOS
2216 * calls from anything but the APM thread, if for no other reason
2217 * than the fact that we don't trust the APM BIOS. This way,
2218 * most common APM BIOS problems that lead to protection errors
2219 * etc will have at least some level of being contained...
2220 *
2221 * In short, if something bad happens, at least we have a choice
2222 * of just killing the apm thread..
2223 */
2224static int __init apm_init(void)
2225{
2226 struct desc_struct *gdt;
2227 int err;
2228
2229 dmi_check_system(apm_dmi_table);
2230
2231 if (apm_info.bios.version == 0 || machine_is_olpc()) {
2232 printk(KERN_INFO "apm: BIOS not found.\n");
2233 return -ENODEV;
2234 }
2235 printk(KERN_INFO
2236 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2237 ((apm_info.bios.version >> 8) & 0xff),
2238 (apm_info.bios.version & 0xff),
2239 apm_info.bios.flags,
2240 driver_version);
2241 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2242 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2243 return -ENODEV;
2244 }
2245
2246 if (allow_ints)
2247 apm_info.allow_ints = 1;
2248 if (broken_psr)
2249 apm_info.get_power_status_broken = 1;
2250 if (realmode_power_off)
2251 apm_info.realmode_power_off = 1;
2252 /* User can override, but default is to trust DMI */
2253 if (apm_disabled != -1)
2254 apm_info.disabled = apm_disabled;
2255
2256 /*
2257 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2258 * but is reportedly a 1.0 BIOS.
2259 */
2260 if (apm_info.bios.version == 0x001)
2261 apm_info.bios.version = 0x100;
2262
2263 /* BIOS < 1.2 doesn't set cseg_16_len */
2264 if (apm_info.bios.version < 0x102)
2265 apm_info.bios.cseg_16_len = 0; /* 64k */
2266
2267 if (debug) {
2268 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2269 apm_info.bios.cseg, apm_info.bios.offset,
2270 apm_info.bios.cseg_16, apm_info.bios.dseg);
2271 if (apm_info.bios.version > 0x100)
2272 printk(" cseg len %x, dseg len %x",
2273 apm_info.bios.cseg_len,
2274 apm_info.bios.dseg_len);
2275 if (apm_info.bios.version > 0x101)
2276 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2277 printk("\n");
2278 }
2279
2280 if (apm_info.disabled) {
2281 pr_notice("disabled on user request.\n");
2282 return -ENODEV;
2283 }
2284 if ((num_online_cpus() > 1) && !power_off && !smp) {
2285 pr_notice("disabled - APM is not SMP safe.\n");
2286 apm_info.disabled = 1;
2287 return -ENODEV;
2288 }
2289 if (!acpi_disabled) {
2290 pr_notice("overridden by ACPI.\n");
2291 apm_info.disabled = 1;
2292 return -ENODEV;
2293 }
2294
2295 /*
2296 * Set up the long jump entry point to the APM BIOS, which is called
2297 * from inline assembly.
2298 */
2299 apm_bios_entry.offset = apm_info.bios.offset;
2300 apm_bios_entry.segment = APM_CS;
2301
2302 /*
2303 * The APM 1.1 BIOS is supposed to provide limit information that it
2304 * recognizes. Many machines do this correctly, but many others do
2305 * not restrict themselves to their claimed limit. When this happens,
2306 * they will cause a segmentation violation in the kernel at boot time.
2307 * Most BIOS's, however, will respect a 64k limit, so we use that.
2308 *
2309 * Note we only set APM segments on CPU zero, since we pin the APM
2310 * code to that CPU.
2311 */
2312 gdt = get_cpu_gdt_rw(0);
2313 set_desc_base(&gdt[APM_CS >> 3],
2314 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2315 set_desc_base(&gdt[APM_CS_16 >> 3],
2316 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2317 set_desc_base(&gdt[APM_DS >> 3],
2318 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2319
2320 proc_create_single("apm", 0, NULL, proc_apm_show);
2321
2322 kapmd_task = kthread_create(apm, NULL, "kapmd");
2323 if (IS_ERR(kapmd_task)) {
2324 pr_err("disabled - Unable to start kernel thread\n");
2325 err = PTR_ERR(kapmd_task);
2326 kapmd_task = NULL;
2327 remove_proc_entry("apm", NULL);
2328 return err;
2329 }
2330 wake_up_process(kapmd_task);
2331
2332 if (num_online_cpus() > 1 && !smp) {
2333 printk(KERN_NOTICE
2334 "apm: disabled - APM is not SMP safe (power off active).\n");
2335 return 0;
2336 }
2337
2338 /*
2339 * Note we don't actually care if the misc_device cannot be registered.
2340 * this driver can do its job without it, even if userspace can't
2341 * control it. just log the error
2342 */
2343 if (misc_register(&apm_device))
2344 printk(KERN_WARNING "apm: Could not register misc device.\n");
2345
2346 if (HZ != 100)
2347 idle_period = (idle_period * HZ) / 100;
2348 if (idle_threshold < 100) {
2349 cpuidle_poll_state_init(&apm_idle_driver);
2350 if (!cpuidle_register_driver(&apm_idle_driver))
2351 if (cpuidle_register_device(&apm_cpuidle_device))
2352 cpuidle_unregister_driver(&apm_idle_driver);
2353 }
2354
2355 return 0;
2356}
2357
2358static void __exit apm_exit(void)
2359{
2360 int error;
2361
2362 cpuidle_unregister_device(&apm_cpuidle_device);
2363 cpuidle_unregister_driver(&apm_idle_driver);
2364
2365 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2366 && (apm_info.connection_version > 0x0100)) {
2367 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2368 if (error)
2369 apm_error("disengage power management", error);
2370 }
2371 misc_deregister(&apm_device);
2372 remove_proc_entry("apm", NULL);
2373 if (power_off)
2374 pm_power_off = NULL;
2375 if (kapmd_task) {
2376 kthread_stop(kapmd_task);
2377 kapmd_task = NULL;
2378 }
2379}
2380
2381module_init(apm_init);
2382module_exit(apm_exit);
2383
2384MODULE_AUTHOR("Stephen Rothwell");
2385MODULE_DESCRIPTION("Advanced Power Management");
2386MODULE_LICENSE("GPL");
2387module_param(debug, bool, 0644);
2388MODULE_PARM_DESC(debug, "Enable debug mode");
2389module_param(power_off, bool, 0444);
2390MODULE_PARM_DESC(power_off, "Enable power off");
2391module_param(bounce_interval, int, 0444);
2392MODULE_PARM_DESC(bounce_interval,
2393 "Set the number of ticks to ignore suspend bounces");
2394module_param(allow_ints, bool, 0444);
2395MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2396module_param(broken_psr, bool, 0444);
2397MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2398module_param(realmode_power_off, bool, 0444);
2399MODULE_PARM_DESC(realmode_power_off,
2400 "Switch to real mode before powering off");
2401module_param(idle_threshold, int, 0444);
2402MODULE_PARM_DESC(idle_threshold,
2403 "System idle percentage above which to make APM BIOS idle calls");
2404module_param(idle_period, int, 0444);
2405MODULE_PARM_DESC(idle_period,
2406 "Period (in sec/100) over which to calculate the idle percentage");
2407module_param(smp, bool, 0444);
2408MODULE_PARM_DESC(smp,
2409 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2410MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
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 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
67 * across BIOS call).
68 * Stephen Rothwell
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>
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@ucw.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@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.
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 from
193 * http://www.microsoft.com/whdc/archive/amp_12.mspx 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/whdc/archive/amp_12.mspx]
202 */
203
204#define pr_fmt(fmt) "apm: " fmt
205
206#include <linux/module.h>
207
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>
236
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>
242
243#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
244extern int (*console_blank_hook)(int);
245#endif
246
247/*
248 * The apm_bios device is one of the misc char devices.
249 * This is its minor number.
250 */
251#define APM_MINOR_DEV 134
252
253/*
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
260 * powering off
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
265 * bounces
266 * idle[-_]threshold=<n> System idle percentage above which to
267 * make APM BIOS idle calls. Set it to
268 * 100 to disable.
269 * idle[-_]period=<n> Period (in 1/100s of a second) over
270 * which the idle percentage is
271 * calculated.
272 */
273
274/* KNOWN PROBLEM MACHINES:
275 *
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
286 *
287 * Legend: U = unusable with APM patches
288 * P = partially usable with APM patches
289 */
290
291/*
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.
295 */
296#define ALWAYS_CALL_BUSY 1
297
298/*
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).
302 */
303#define APM_ZERO_SEGS
304
305#include <asm/apm.h>
306
307/*
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>
311 */
312#undef INIT_TIMER_AFTER_SUSPEND
313
314#ifdef INIT_TIMER_AFTER_SUSPEND
315#include <linux/timex.h>
316#include <asm/io.h>
317#include <linux/delay.h>
318#endif
319
320/*
321 * Need to poll the APM BIOS every second
322 */
323#define APM_CHECK_TIMEOUT (HZ)
324
325/*
326 * Ignore suspend events for this amount of time after a resume
327 */
328#define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
329
330/*
331 * Maximum number of events stored
332 */
333#define APM_MAX_EVENTS 20
334
335/*
336 * The per-file APM data
337 */
338struct apm_user {
339 int magic;
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;
345 int suspend_result;
346 int suspends_pending;
347 int standbys_pending;
348 int suspends_read;
349 int standbys_read;
350 int event_head;
351 int event_tail;
352 apm_event_t events[APM_MAX_EVENTS];
353};
354
355/*
356 * The magic number in apm_user
357 */
358#define APM_BIOS_MAGIC 0x4101
359
360/*
361 * idle percentage above which bios idle calls are done
362 */
363#ifdef CONFIG_APM_CPU_IDLE
364#define DEFAULT_IDLE_THRESHOLD 95
365#else
366#define DEFAULT_IDLE_THRESHOLD 100
367#endif
368#define DEFAULT_IDLE_PERIOD (100 / 3)
369
370static int apm_cpu_idle(struct cpuidle_device *dev,
371 struct cpuidle_driver *drv, int index);
372
373static struct cpuidle_driver apm_idle_driver = {
374 .name = "apm_idle",
375 .owner = THIS_MODULE,
376 .states = {
377 { /* entry 0 is for polling */ },
378 { /* entry 1 is for APM idle */
379 .name = "APM",
380 .desc = "APM idle",
381 .flags = CPUIDLE_FLAG_TIME_VALID,
382 .exit_latency = 250, /* WAG */
383 .target_residency = 500, /* WAG */
384 .enter = &apm_cpu_idle
385 },
386 },
387 .state_count = 2,
388};
389
390static struct cpuidle_device apm_cpuidle_device;
391
392/*
393 * Local variables
394 */
395__visible struct {
396 unsigned long offset;
397 unsigned short segment;
398} apm_bios_entry;
399static int clock_slowed;
400static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
401static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
402static int suspends_pending;
403static int standbys_pending;
404static int ignore_sys_suspend;
405static int ignore_normal_resume;
406static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
407
408static bool debug __read_mostly;
409static bool smp __read_mostly;
410static int apm_disabled = -1;
411#ifdef CONFIG_SMP
412static bool power_off;
413#else
414static bool power_off = 1;
415#endif
416static bool realmode_power_off;
417#ifdef CONFIG_APM_ALLOW_INTS
418static bool allow_ints = 1;
419#else
420static bool allow_ints;
421#endif
422static bool broken_psr;
423
424static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
425static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
426static struct apm_user *user_list;
427static DEFINE_SPINLOCK(user_list_lock);
428static DEFINE_MUTEX(apm_mutex);
429
430/*
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.
435 */
436static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
437 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
438
439static const char driver_version[] = "1.16ac"; /* no spaces */
440
441static struct task_struct *kapmd_task;
442
443/*
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
446 */
447static const char * const apm_event_name[] = {
448 "system standby",
449 "system suspend",
450 "normal resume",
451 "critical resume",
452 "low battery",
453 "power status change",
454 "update time",
455 "critical suspend",
456 "user standby",
457 "user suspend",
458 "system standby resume",
459 "capabilities change"
460};
461#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
462
463typedef struct lookup_t {
464 int key;
465 char *msg;
466} lookup_t;
467
468/*
469 * The BIOS returns a set of standard error codes in AX when the
470 * carry flag is set.
471 */
472
473static 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" }
491};
492#define ERROR_COUNT ARRAY_SIZE(error_table)
493
494/**
495 * apm_error - display an APM error
496 * @str: information string
497 * @err: APM BIOS return code
498 *
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.
501 */
502
503static void apm_error(char *str, int err)
504{
505 int i;
506
507 for (i = 0; i < ERROR_COUNT; i++)
508 if (error_table[i].key == err)
509 break;
510 if (i < ERROR_COUNT)
511 pr_notice("%s: %s\n", str, error_table[i].msg);
512 else if (err < 0)
513 pr_notice("%s: linux error code %i\n", str, err);
514 else
515 pr_notice("%s: unknown error code %#2.2x\n",
516 str, err);
517}
518
519/*
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.
531 *
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.
534 */
535
536static inline unsigned long __apm_irq_save(void)
537{
538 unsigned long flags;
539 local_save_flags(flags);
540 if (apm_info.allow_ints) {
541 if (irqs_disabled_flags(flags))
542 local_irq_enable();
543 } else
544 local_irq_disable();
545
546 return flags;
547}
548
549#define apm_irq_save(flags) \
550 do { flags = __apm_irq_save(); } while (0)
551
552static inline void apm_irq_restore(unsigned long flags)
553{
554 if (irqs_disabled_flags(flags))
555 local_irq_disable();
556 else if (irqs_disabled())
557 local_irq_enable();
558}
559
560#ifdef APM_ZERO_SEGS
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)
567#else
568# define APM_DECL_SEGS
569# define APM_DO_SAVE_SEGS
570# define APM_DO_RESTORE_SEGS
571#endif
572
573struct apm_bios_call {
574 u32 func;
575 /* In and out */
576 u32 ebx;
577 u32 ecx;
578 /* Out only */
579 u32 eax;
580 u32 edx;
581 u32 esi;
582
583 /* Error: -ENOMEM, or bits 8-15 of eax */
584 int err;
585};
586
587/**
588 * __apm_bios_call - Make an APM BIOS 32bit call
589 * @_call: pointer to struct apm_bios_call.
590 *
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
597 * returns non-zero.
598 *
599 * Note: this makes the call on the current CPU.
600 */
601static long __apm_bios_call(void *_call)
602{
603 APM_DECL_SEGS
604 unsigned long flags;
605 int cpu;
606 struct desc_struct save_desc_40;
607 struct desc_struct *gdt;
608 struct apm_bios_call *call = _call;
609
610 cpu = get_cpu();
611 BUG_ON(cpu != 0);
612 gdt = get_cpu_gdt_table(cpu);
613 save_desc_40 = gdt[0x40 / 8];
614 gdt[0x40 / 8] = bad_bios_desc;
615
616 apm_irq_save(flags);
617 APM_DO_SAVE_SEGS;
618 apm_bios_call_asm(call->func, call->ebx, call->ecx,
619 &call->eax, &call->ebx, &call->ecx, &call->edx,
620 &call->esi);
621 APM_DO_RESTORE_SEGS;
622 apm_irq_restore(flags);
623 gdt[0x40 / 8] = save_desc_40;
624 put_cpu();
625
626 return call->eax & 0xff;
627}
628
629/* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
630static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
631{
632 int ret;
633
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) {
637 ret = fn(call);
638 put_cpu();
639 } else {
640 put_cpu();
641 ret = work_on_cpu(0, fn, call);
642 }
643
644 /* work_on_cpu can fail with -ENOMEM */
645 if (ret < 0)
646 call->err = ret;
647 else
648 call->err = (call->eax >> 8) & 0xff;
649
650 return ret;
651}
652
653/**
654 * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0)
655 * @call: the apm_bios_call registers.
656 *
657 * If there is an error, it is returned in @call.err.
658 */
659static int apm_bios_call(struct apm_bios_call *call)
660{
661 return on_cpu0(__apm_bios_call, call);
662}
663
664/**
665 * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
666 * @_call: pointer to struct apm_bios_call.
667 *
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.
673 *
674 * Note: this makes the call on the current CPU.
675 */
676static long __apm_bios_call_simple(void *_call)
677{
678 u8 error;
679 APM_DECL_SEGS
680 unsigned long flags;
681 int cpu;
682 struct desc_struct save_desc_40;
683 struct desc_struct *gdt;
684 struct apm_bios_call *call = _call;
685
686 cpu = get_cpu();
687 BUG_ON(cpu != 0);
688 gdt = get_cpu_gdt_table(cpu);
689 save_desc_40 = gdt[0x40 / 8];
690 gdt[0x40 / 8] = bad_bios_desc;
691
692 apm_irq_save(flags);
693 APM_DO_SAVE_SEGS;
694 error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
695 &call->eax);
696 APM_DO_RESTORE_SEGS;
697 apm_irq_restore(flags);
698 gdt[0x40 / 8] = save_desc_40;
699 put_cpu();
700 return error;
701}
702
703/**
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
709 * @err: bits
710 *
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.
716 */
717static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
718 int *err)
719{
720 struct apm_bios_call call;
721 int ret;
722
723 call.func = func;
724 call.ebx = ebx_in;
725 call.ecx = ecx_in;
726
727 ret = on_cpu0(__apm_bios_call_simple, &call);
728 *eax = call.eax;
729 *err = call.err;
730 return ret;
731}
732
733/**
734 * apm_driver_version - APM driver version
735 * @val: loaded with the APM version on return
736 *
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
739 * probably present.
740 *
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
744 *
745 * On return it will hold the BIOS revision supported in the
746 * same format.
747 */
748
749static int apm_driver_version(u_short *val)
750{
751 u32 eax;
752 int err;
753
754 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
755 return err;
756 *val = eax;
757 return APM_SUCCESS;
758}
759
760/**
761 * apm_get_event - get an APM event from the BIOS
762 * @event: pointer to the event
763 * @info: point to the event information
764 *
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.
771 *
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).
775 */
776static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
777{
778 struct apm_bios_call call;
779
780 call.func = APM_FUNC_GET_EVENT;
781 call.ebx = call.ecx = 0;
782
783 if (apm_bios_call(&call))
784 return call.err;
785
786 *event = call.ebx;
787 if (apm_info.connection_version < 0x0102)
788 *info = ~0; /* indicate info not valid */
789 else
790 *info = call.ecx;
791 return APM_SUCCESS;
792}
793
794/**
795 * set_power_state - set the power management state
796 * @what: which items to transition
797 * @state: state to transition to
798 *
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.
803 *
804 * The state holds the state to transition to, which may in fact
805 * be an acceptance of a BIOS requested state change.
806 */
807
808static int set_power_state(u_short what, u_short state)
809{
810 u32 eax;
811 int err;
812
813 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
814 return err;
815 return APM_SUCCESS;
816}
817
818/**
819 * set_system_power_state - set system wide power state
820 * @state: which state to enter
821 *
822 * Transition the entire system into a new APM power state.
823 */
824
825static int set_system_power_state(u_short state)
826{
827 return set_power_state(APM_DEVICE_ALL, state);
828}
829
830/**
831 * apm_do_idle - perform power saving
832 *
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.
837 */
838
839static int apm_do_idle(void)
840{
841 u32 eax;
842 u8 ret = 0;
843 int idled = 0;
844 int polling;
845 int err = 0;
846
847 polling = !!(current_thread_info()->status & TS_POLLING);
848 if (polling) {
849 current_thread_info()->status &= ~TS_POLLING;
850 /*
851 * TS_POLLING-cleared state must be visible before we
852 * test NEED_RESCHED:
853 */
854 smp_mb();
855 }
856 if (!need_resched()) {
857 idled = 1;
858 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
859 }
860 if (polling)
861 current_thread_info()->status |= TS_POLLING;
862
863 if (!idled)
864 return 0;
865
866 if (ret) {
867 static unsigned long t;
868
869 /* This always fails on some SMP boards running UP kernels.
870 * Only report the failure the first 5 times.
871 */
872 if (++t < 5) {
873 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
874 t = jiffies;
875 }
876 return -1;
877 }
878 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
879 return clock_slowed;
880}
881
882/**
883 * apm_do_busy - inform the BIOS the CPU is busy
884 *
885 * Request that the BIOS brings the CPU back to full performance.
886 */
887
888static void apm_do_busy(void)
889{
890 u32 dummy;
891 int err;
892
893 if (clock_slowed || ALWAYS_CALL_BUSY) {
894 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
895 clock_slowed = 0;
896 }
897}
898
899/*
900 * If no process has really been interested in
901 * the CPU for some time, we want to call BIOS
902 * power management - we probably want
903 * to conserve power.
904 */
905#define IDLE_CALC_LIMIT (HZ * 100)
906#define IDLE_LEAKY_MAX 16
907
908/**
909 * apm_cpu_idle - cpu idling for APM capable Linux
910 *
911 * This is the idling function the kernel executes when APM is available. It
912 * tries to do BIOS powermanagement based on the average system idle time.
913 * Furthermore it calls the system default idle routine.
914 */
915
916static int apm_cpu_idle(struct cpuidle_device *dev,
917 struct cpuidle_driver *drv, int index)
918{
919 static int use_apm_idle; /* = 0 */
920 static unsigned int last_jiffies; /* = 0 */
921 static unsigned int last_stime; /* = 0 */
922 cputime_t stime;
923
924 int apm_idle_done = 0;
925 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
926 unsigned int bucket;
927
928recalc:
929 task_cputime(current, NULL, &stime);
930 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
931 use_apm_idle = 0;
932 } else if (jiffies_since_last_check > idle_period) {
933 unsigned int idle_percentage;
934
935 idle_percentage = stime - last_stime;
936 idle_percentage *= 100;
937 idle_percentage /= jiffies_since_last_check;
938 use_apm_idle = (idle_percentage > idle_threshold);
939 if (apm_info.forbid_idle)
940 use_apm_idle = 0;
941 }
942
943 last_jiffies = jiffies;
944 last_stime = stime;
945
946 bucket = IDLE_LEAKY_MAX;
947
948 while (!need_resched()) {
949 if (use_apm_idle) {
950 unsigned int t;
951
952 t = jiffies;
953 switch (apm_do_idle()) {
954 case 0:
955 apm_idle_done = 1;
956 if (t != jiffies) {
957 if (bucket) {
958 bucket = IDLE_LEAKY_MAX;
959 continue;
960 }
961 } else if (bucket) {
962 bucket--;
963 continue;
964 }
965 break;
966 case 1:
967 apm_idle_done = 1;
968 break;
969 default: /* BIOS refused */
970 break;
971 }
972 }
973 default_idle();
974 local_irq_disable();
975 jiffies_since_last_check = jiffies - last_jiffies;
976 if (jiffies_since_last_check > idle_period)
977 goto recalc;
978 }
979
980 if (apm_idle_done)
981 apm_do_busy();
982
983 return index;
984}
985
986/**
987 * apm_power_off - ask the BIOS to power off
988 *
989 * Handle the power off sequence. This is the one piece of code we
990 * will execute even on SMP machines. In order to deal with BIOS
991 * bugs we support real mode APM BIOS power off calls. We also make
992 * the SMP call on CPU0 as some systems will only honour this call
993 * on their first cpu.
994 */
995
996static void apm_power_off(void)
997{
998 /* Some bioses don't like being called from CPU != 0 */
999 if (apm_info.realmode_power_off) {
1000 set_cpus_allowed_ptr(current, cpumask_of(0));
1001 machine_real_restart(MRR_APM);
1002 } else {
1003 (void)set_system_power_state(APM_STATE_OFF);
1004 }
1005}
1006
1007#ifdef CONFIG_APM_DO_ENABLE
1008
1009/**
1010 * apm_enable_power_management - enable BIOS APM power management
1011 * @enable: enable yes/no
1012 *
1013 * Enable or disable the APM BIOS power services.
1014 */
1015
1016static int apm_enable_power_management(int enable)
1017{
1018 u32 eax;
1019 int err;
1020
1021 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1022 return APM_NOT_ENGAGED;
1023 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1024 enable, &eax, &err))
1025 return err;
1026 if (enable)
1027 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1028 else
1029 apm_info.bios.flags |= APM_BIOS_DISABLED;
1030 return APM_SUCCESS;
1031}
1032#endif
1033
1034/**
1035 * apm_get_power_status - get current power state
1036 * @status: returned status
1037 * @bat: battery info
1038 * @life: estimated life
1039 *
1040 * Obtain the current power status from the APM BIOS. We return a
1041 * status which gives the rough battery status, and current power
1042 * source. The bat value returned give an estimate as a percentage
1043 * of life and a status value for the battery. The estimated life
1044 * if reported is a lifetime in secodnds/minutes at current powwer
1045 * consumption.
1046 */
1047
1048static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1049{
1050 struct apm_bios_call call;
1051
1052 call.func = APM_FUNC_GET_STATUS;
1053 call.ebx = APM_DEVICE_ALL;
1054 call.ecx = 0;
1055
1056 if (apm_info.get_power_status_broken)
1057 return APM_32_UNSUPPORTED;
1058 if (apm_bios_call(&call))
1059 return call.err;
1060 *status = call.ebx;
1061 *bat = call.ecx;
1062 if (apm_info.get_power_status_swabinminutes) {
1063 *life = swab16((u16)call.edx);
1064 *life |= 0x8000;
1065 } else
1066 *life = call.edx;
1067 return APM_SUCCESS;
1068}
1069
1070#if 0
1071static int apm_get_battery_status(u_short which, u_short *status,
1072 u_short *bat, u_short *life, u_short *nbat)
1073{
1074 u32 eax;
1075 u32 ebx;
1076 u32 ecx;
1077 u32 edx;
1078 u32 esi;
1079
1080 if (apm_info.connection_version < 0x0102) {
1081 /* pretend we only have one battery. */
1082 if (which != 1)
1083 return APM_BAD_DEVICE;
1084 *nbat = 1;
1085 return apm_get_power_status(status, bat, life);
1086 }
1087
1088 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1089 &ebx, &ecx, &edx, &esi))
1090 return (eax >> 8) & 0xff;
1091 *status = ebx;
1092 *bat = ecx;
1093 *life = edx;
1094 *nbat = esi;
1095 return APM_SUCCESS;
1096}
1097#endif
1098
1099/**
1100 * apm_engage_power_management - enable PM on a device
1101 * @device: identity of device
1102 * @enable: on/off
1103 *
1104 * Activate or deactive power management on either a specific device
1105 * or the entire system (%APM_DEVICE_ALL).
1106 */
1107
1108static int apm_engage_power_management(u_short device, int enable)
1109{
1110 u32 eax;
1111 int err;
1112
1113 if ((enable == 0) && (device == APM_DEVICE_ALL)
1114 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1115 return APM_DISABLED;
1116 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1117 &eax, &err))
1118 return err;
1119 if (device == APM_DEVICE_ALL) {
1120 if (enable)
1121 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1122 else
1123 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1124 }
1125 return APM_SUCCESS;
1126}
1127
1128#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1129
1130/**
1131 * apm_console_blank - blank the display
1132 * @blank: on/off
1133 *
1134 * Attempt to blank the console, firstly by blanking just video device
1135 * zero, and if that fails (some BIOSes don't support it) then it blanks
1136 * all video devices. Typically the BIOS will do laptop backlight and
1137 * monitor powerdown for us.
1138 */
1139
1140static int apm_console_blank(int blank)
1141{
1142 int error = APM_NOT_ENGAGED; /* silence gcc */
1143 int i;
1144 u_short state;
1145 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1146
1147 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1148
1149 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1150 error = set_power_state(dev[i], state);
1151
1152 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1153 return 1;
1154
1155 if (error == APM_NOT_ENGAGED)
1156 break;
1157 }
1158
1159 if (error == APM_NOT_ENGAGED) {
1160 static int tried;
1161 int eng_error;
1162 if (tried++ == 0) {
1163 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1164 if (eng_error) {
1165 apm_error("set display", error);
1166 apm_error("engage interface", eng_error);
1167 return 0;
1168 } else
1169 return apm_console_blank(blank);
1170 }
1171 }
1172 apm_error("set display", error);
1173 return 0;
1174}
1175#endif
1176
1177static int queue_empty(struct apm_user *as)
1178{
1179 return as->event_head == as->event_tail;
1180}
1181
1182static apm_event_t get_queued_event(struct apm_user *as)
1183{
1184 if (++as->event_tail >= APM_MAX_EVENTS)
1185 as->event_tail = 0;
1186 return as->events[as->event_tail];
1187}
1188
1189static void queue_event(apm_event_t event, struct apm_user *sender)
1190{
1191 struct apm_user *as;
1192
1193 spin_lock(&user_list_lock);
1194 if (user_list == NULL)
1195 goto out;
1196 for (as = user_list; as != NULL; as = as->next) {
1197 if ((as == sender) || (!as->reader))
1198 continue;
1199 if (++as->event_head >= APM_MAX_EVENTS)
1200 as->event_head = 0;
1201
1202 if (as->event_head == as->event_tail) {
1203 static int notified;
1204
1205 if (notified++ == 0)
1206 pr_err("an event queue overflowed\n");
1207 if (++as->event_tail >= APM_MAX_EVENTS)
1208 as->event_tail = 0;
1209 }
1210 as->events[as->event_head] = event;
1211 if (!as->suser || !as->writer)
1212 continue;
1213 switch (event) {
1214 case APM_SYS_SUSPEND:
1215 case APM_USER_SUSPEND:
1216 as->suspends_pending++;
1217 suspends_pending++;
1218 break;
1219
1220 case APM_SYS_STANDBY:
1221 case APM_USER_STANDBY:
1222 as->standbys_pending++;
1223 standbys_pending++;
1224 break;
1225 }
1226 }
1227 wake_up_interruptible(&apm_waitqueue);
1228out:
1229 spin_unlock(&user_list_lock);
1230}
1231
1232static void reinit_timer(void)
1233{
1234#ifdef INIT_TIMER_AFTER_SUSPEND
1235 unsigned long flags;
1236
1237 raw_spin_lock_irqsave(&i8253_lock, flags);
1238 /* set the clock to HZ */
1239 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1240 udelay(10);
1241 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1242 udelay(10);
1243 outb_p(LATCH >> 8, PIT_CH0); /* MSB */
1244 udelay(10);
1245 raw_spin_unlock_irqrestore(&i8253_lock, flags);
1246#endif
1247}
1248
1249static int suspend(int vetoable)
1250{
1251 int err;
1252 struct apm_user *as;
1253
1254 dpm_suspend_start(PMSG_SUSPEND);
1255 dpm_suspend_end(PMSG_SUSPEND);
1256
1257 local_irq_disable();
1258 syscore_suspend();
1259
1260 local_irq_enable();
1261
1262 save_processor_state();
1263 err = set_system_power_state(APM_STATE_SUSPEND);
1264 ignore_normal_resume = 1;
1265 restore_processor_state();
1266
1267 local_irq_disable();
1268 reinit_timer();
1269
1270 if (err == APM_NO_ERROR)
1271 err = APM_SUCCESS;
1272 if (err != APM_SUCCESS)
1273 apm_error("suspend", err);
1274 err = (err == APM_SUCCESS) ? 0 : -EIO;
1275
1276 syscore_resume();
1277 local_irq_enable();
1278
1279 dpm_resume_start(PMSG_RESUME);
1280 dpm_resume_end(PMSG_RESUME);
1281
1282 queue_event(APM_NORMAL_RESUME, NULL);
1283 spin_lock(&user_list_lock);
1284 for (as = user_list; as != NULL; as = as->next) {
1285 as->suspend_wait = 0;
1286 as->suspend_result = err;
1287 }
1288 spin_unlock(&user_list_lock);
1289 wake_up_interruptible(&apm_suspend_waitqueue);
1290 return err;
1291}
1292
1293static void standby(void)
1294{
1295 int err;
1296
1297 dpm_suspend_end(PMSG_SUSPEND);
1298
1299 local_irq_disable();
1300 syscore_suspend();
1301 local_irq_enable();
1302
1303 err = set_system_power_state(APM_STATE_STANDBY);
1304 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1305 apm_error("standby", err);
1306
1307 local_irq_disable();
1308 syscore_resume();
1309 local_irq_enable();
1310
1311 dpm_resume_start(PMSG_RESUME);
1312}
1313
1314static apm_event_t get_event(void)
1315{
1316 int error;
1317 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1318 apm_eventinfo_t info;
1319
1320 static int notified;
1321
1322 /* we don't use the eventinfo */
1323 error = apm_get_event(&event, &info);
1324 if (error == APM_SUCCESS)
1325 return event;
1326
1327 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1328 apm_error("get_event", error);
1329
1330 return 0;
1331}
1332
1333static void check_events(void)
1334{
1335 apm_event_t event;
1336 static unsigned long last_resume;
1337 static int ignore_bounce;
1338
1339 while ((event = get_event()) != 0) {
1340 if (debug) {
1341 if (event <= NR_APM_EVENT_NAME)
1342 printk(KERN_DEBUG "apm: received %s notify\n",
1343 apm_event_name[event - 1]);
1344 else
1345 printk(KERN_DEBUG "apm: received unknown "
1346 "event 0x%02x\n", event);
1347 }
1348 if (ignore_bounce
1349 && (time_after(jiffies, last_resume + bounce_interval)))
1350 ignore_bounce = 0;
1351
1352 switch (event) {
1353 case APM_SYS_STANDBY:
1354 case APM_USER_STANDBY:
1355 queue_event(event, NULL);
1356 if (standbys_pending <= 0)
1357 standby();
1358 break;
1359
1360 case APM_USER_SUSPEND:
1361#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1362 if (apm_info.connection_version > 0x100)
1363 set_system_power_state(APM_STATE_REJECT);
1364 break;
1365#endif
1366 case APM_SYS_SUSPEND:
1367 if (ignore_bounce) {
1368 if (apm_info.connection_version > 0x100)
1369 set_system_power_state(APM_STATE_REJECT);
1370 break;
1371 }
1372 /*
1373 * If we are already processing a SUSPEND,
1374 * then further SUSPEND events from the BIOS
1375 * will be ignored. We also return here to
1376 * cope with the fact that the Thinkpads keep
1377 * sending a SUSPEND event until something else
1378 * happens!
1379 */
1380 if (ignore_sys_suspend)
1381 return;
1382 ignore_sys_suspend = 1;
1383 queue_event(event, NULL);
1384 if (suspends_pending <= 0)
1385 (void) suspend(1);
1386 break;
1387
1388 case APM_NORMAL_RESUME:
1389 case APM_CRITICAL_RESUME:
1390 case APM_STANDBY_RESUME:
1391 ignore_sys_suspend = 0;
1392 last_resume = jiffies;
1393 ignore_bounce = 1;
1394 if ((event != APM_NORMAL_RESUME)
1395 || (ignore_normal_resume == 0)) {
1396 dpm_resume_end(PMSG_RESUME);
1397 queue_event(event, NULL);
1398 }
1399 ignore_normal_resume = 0;
1400 break;
1401
1402 case APM_CAPABILITY_CHANGE:
1403 case APM_LOW_BATTERY:
1404 case APM_POWER_STATUS_CHANGE:
1405 queue_event(event, NULL);
1406 /* If needed, notify drivers here */
1407 break;
1408
1409 case APM_UPDATE_TIME:
1410 break;
1411
1412 case APM_CRITICAL_SUSPEND:
1413 /*
1414 * We are not allowed to reject a critical suspend.
1415 */
1416 (void)suspend(0);
1417 break;
1418 }
1419 }
1420}
1421
1422static void apm_event_handler(void)
1423{
1424 static int pending_count = 4;
1425 int err;
1426
1427 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1428 if ((apm_info.connection_version > 0x100) &&
1429 (pending_count-- <= 0)) {
1430 pending_count = 4;
1431 if (debug)
1432 printk(KERN_DEBUG "apm: setting state busy\n");
1433 err = set_system_power_state(APM_STATE_BUSY);
1434 if (err)
1435 apm_error("busy", err);
1436 }
1437 } else
1438 pending_count = 4;
1439 check_events();
1440}
1441
1442/*
1443 * This is the APM thread main loop.
1444 */
1445
1446static void apm_mainloop(void)
1447{
1448 DECLARE_WAITQUEUE(wait, current);
1449
1450 add_wait_queue(&apm_waitqueue, &wait);
1451 set_current_state(TASK_INTERRUPTIBLE);
1452 for (;;) {
1453 schedule_timeout(APM_CHECK_TIMEOUT);
1454 if (kthread_should_stop())
1455 break;
1456 /*
1457 * Ok, check all events, check for idle (and mark us sleeping
1458 * so as not to count towards the load average)..
1459 */
1460 set_current_state(TASK_INTERRUPTIBLE);
1461 apm_event_handler();
1462 }
1463 remove_wait_queue(&apm_waitqueue, &wait);
1464}
1465
1466static int check_apm_user(struct apm_user *as, const char *func)
1467{
1468 if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1469 pr_err("%s passed bad filp\n", func);
1470 return 1;
1471 }
1472 return 0;
1473}
1474
1475static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1476{
1477 struct apm_user *as;
1478 int i;
1479 apm_event_t event;
1480
1481 as = fp->private_data;
1482 if (check_apm_user(as, "read"))
1483 return -EIO;
1484 if ((int)count < sizeof(apm_event_t))
1485 return -EINVAL;
1486 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1487 return -EAGAIN;
1488 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1489 i = count;
1490 while ((i >= sizeof(event)) && !queue_empty(as)) {
1491 event = get_queued_event(as);
1492 if (copy_to_user(buf, &event, sizeof(event))) {
1493 if (i < count)
1494 break;
1495 return -EFAULT;
1496 }
1497 switch (event) {
1498 case APM_SYS_SUSPEND:
1499 case APM_USER_SUSPEND:
1500 as->suspends_read++;
1501 break;
1502
1503 case APM_SYS_STANDBY:
1504 case APM_USER_STANDBY:
1505 as->standbys_read++;
1506 break;
1507 }
1508 buf += sizeof(event);
1509 i -= sizeof(event);
1510 }
1511 if (i < count)
1512 return count - i;
1513 if (signal_pending(current))
1514 return -ERESTARTSYS;
1515 return 0;
1516}
1517
1518static unsigned int do_poll(struct file *fp, poll_table *wait)
1519{
1520 struct apm_user *as;
1521
1522 as = fp->private_data;
1523 if (check_apm_user(as, "poll"))
1524 return 0;
1525 poll_wait(fp, &apm_waitqueue, wait);
1526 if (!queue_empty(as))
1527 return POLLIN | POLLRDNORM;
1528 return 0;
1529}
1530
1531static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1532{
1533 struct apm_user *as;
1534 int ret;
1535
1536 as = filp->private_data;
1537 if (check_apm_user(as, "ioctl"))
1538 return -EIO;
1539 if (!as->suser || !as->writer)
1540 return -EPERM;
1541 switch (cmd) {
1542 case APM_IOC_STANDBY:
1543 mutex_lock(&apm_mutex);
1544 if (as->standbys_read > 0) {
1545 as->standbys_read--;
1546 as->standbys_pending--;
1547 standbys_pending--;
1548 } else
1549 queue_event(APM_USER_STANDBY, as);
1550 if (standbys_pending <= 0)
1551 standby();
1552 mutex_unlock(&apm_mutex);
1553 break;
1554 case APM_IOC_SUSPEND:
1555 mutex_lock(&apm_mutex);
1556 if (as->suspends_read > 0) {
1557 as->suspends_read--;
1558 as->suspends_pending--;
1559 suspends_pending--;
1560 } else
1561 queue_event(APM_USER_SUSPEND, as);
1562 if (suspends_pending <= 0) {
1563 ret = suspend(1);
1564 mutex_unlock(&apm_mutex);
1565 } else {
1566 as->suspend_wait = 1;
1567 mutex_unlock(&apm_mutex);
1568 wait_event_interruptible(apm_suspend_waitqueue,
1569 as->suspend_wait == 0);
1570 ret = as->suspend_result;
1571 }
1572 return ret;
1573 default:
1574 return -ENOTTY;
1575 }
1576 return 0;
1577}
1578
1579static int do_release(struct inode *inode, struct file *filp)
1580{
1581 struct apm_user *as;
1582
1583 as = filp->private_data;
1584 if (check_apm_user(as, "release"))
1585 return 0;
1586 filp->private_data = NULL;
1587 if (as->standbys_pending > 0) {
1588 standbys_pending -= as->standbys_pending;
1589 if (standbys_pending <= 0)
1590 standby();
1591 }
1592 if (as->suspends_pending > 0) {
1593 suspends_pending -= as->suspends_pending;
1594 if (suspends_pending <= 0)
1595 (void) suspend(1);
1596 }
1597 spin_lock(&user_list_lock);
1598 if (user_list == as)
1599 user_list = as->next;
1600 else {
1601 struct apm_user *as1;
1602
1603 for (as1 = user_list;
1604 (as1 != NULL) && (as1->next != as);
1605 as1 = as1->next)
1606 ;
1607 if (as1 == NULL)
1608 pr_err("filp not in user list\n");
1609 else
1610 as1->next = as->next;
1611 }
1612 spin_unlock(&user_list_lock);
1613 kfree(as);
1614 return 0;
1615}
1616
1617static int do_open(struct inode *inode, struct file *filp)
1618{
1619 struct apm_user *as;
1620
1621 as = kmalloc(sizeof(*as), GFP_KERNEL);
1622 if (as == NULL)
1623 return -ENOMEM;
1624
1625 as->magic = APM_BIOS_MAGIC;
1626 as->event_tail = as->event_head = 0;
1627 as->suspends_pending = as->standbys_pending = 0;
1628 as->suspends_read = as->standbys_read = 0;
1629 /*
1630 * XXX - this is a tiny bit broken, when we consider BSD
1631 * process accounting. If the device is opened by root, we
1632 * instantly flag that we used superuser privs. Who knows,
1633 * we might close the device immediately without doing a
1634 * privileged operation -- cevans
1635 */
1636 as->suser = capable(CAP_SYS_ADMIN);
1637 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1638 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1639 spin_lock(&user_list_lock);
1640 as->next = user_list;
1641 user_list = as;
1642 spin_unlock(&user_list_lock);
1643 filp->private_data = as;
1644 return 0;
1645}
1646
1647static int proc_apm_show(struct seq_file *m, void *v)
1648{
1649 unsigned short bx;
1650 unsigned short cx;
1651 unsigned short dx;
1652 int error;
1653 unsigned short ac_line_status = 0xff;
1654 unsigned short battery_status = 0xff;
1655 unsigned short battery_flag = 0xff;
1656 int percentage = -1;
1657 int time_units = -1;
1658 char *units = "?";
1659
1660 if ((num_online_cpus() == 1) &&
1661 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1662 ac_line_status = (bx >> 8) & 0xff;
1663 battery_status = bx & 0xff;
1664 if ((cx & 0xff) != 0xff)
1665 percentage = cx & 0xff;
1666
1667 if (apm_info.connection_version > 0x100) {
1668 battery_flag = (cx >> 8) & 0xff;
1669 if (dx != 0xffff) {
1670 units = (dx & 0x8000) ? "min" : "sec";
1671 time_units = dx & 0x7fff;
1672 }
1673 }
1674 }
1675 /* Arguments, with symbols from linux/apm_bios.h. Information is
1676 from the Get Power Status (0x0a) call unless otherwise noted.
1677
1678 0) Linux driver version (this will change if format changes)
1679 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1680 2) APM flags from APM Installation Check (0x00):
1681 bit 0: APM_16_BIT_SUPPORT
1682 bit 1: APM_32_BIT_SUPPORT
1683 bit 2: APM_IDLE_SLOWS_CLOCK
1684 bit 3: APM_BIOS_DISABLED
1685 bit 4: APM_BIOS_DISENGAGED
1686 3) AC line status
1687 0x00: Off-line
1688 0x01: On-line
1689 0x02: On backup power (BIOS >= 1.1 only)
1690 0xff: Unknown
1691 4) Battery status
1692 0x00: High
1693 0x01: Low
1694 0x02: Critical
1695 0x03: Charging
1696 0x04: Selected battery not present (BIOS >= 1.2 only)
1697 0xff: Unknown
1698 5) Battery flag
1699 bit 0: High
1700 bit 1: Low
1701 bit 2: Critical
1702 bit 3: Charging
1703 bit 7: No system battery
1704 0xff: Unknown
1705 6) Remaining battery life (percentage of charge):
1706 0-100: valid
1707 -1: Unknown
1708 7) Remaining battery life (time units):
1709 Number of remaining minutes or seconds
1710 -1: Unknown
1711 8) min = minutes; sec = seconds */
1712
1713 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1714 driver_version,
1715 (apm_info.bios.version >> 8) & 0xff,
1716 apm_info.bios.version & 0xff,
1717 apm_info.bios.flags,
1718 ac_line_status,
1719 battery_status,
1720 battery_flag,
1721 percentage,
1722 time_units,
1723 units);
1724 return 0;
1725}
1726
1727static int proc_apm_open(struct inode *inode, struct file *file)
1728{
1729 return single_open(file, proc_apm_show, NULL);
1730}
1731
1732static const struct file_operations apm_file_ops = {
1733 .owner = THIS_MODULE,
1734 .open = proc_apm_open,
1735 .read = seq_read,
1736 .llseek = seq_lseek,
1737 .release = single_release,
1738};
1739
1740static int apm(void *unused)
1741{
1742 unsigned short bx;
1743 unsigned short cx;
1744 unsigned short dx;
1745 int error;
1746 char *power_stat;
1747 char *bat_stat;
1748
1749 /* 2002/08/01 - WT
1750 * This is to avoid random crashes at boot time during initialization
1751 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1752 * Some bioses don't like being called from CPU != 0.
1753 * Method suggested by Ingo Molnar.
1754 */
1755 set_cpus_allowed_ptr(current, cpumask_of(0));
1756 BUG_ON(smp_processor_id() != 0);
1757
1758 if (apm_info.connection_version == 0) {
1759 apm_info.connection_version = apm_info.bios.version;
1760 if (apm_info.connection_version > 0x100) {
1761 /*
1762 * We only support BIOSs up to version 1.2
1763 */
1764 if (apm_info.connection_version > 0x0102)
1765 apm_info.connection_version = 0x0102;
1766 error = apm_driver_version(&apm_info.connection_version);
1767 if (error != APM_SUCCESS) {
1768 apm_error("driver version", error);
1769 /* Fall back to an APM 1.0 connection. */
1770 apm_info.connection_version = 0x100;
1771 }
1772 }
1773 }
1774
1775 if (debug)
1776 printk(KERN_INFO "apm: Connection version %d.%d\n",
1777 (apm_info.connection_version >> 8) & 0xff,
1778 apm_info.connection_version & 0xff);
1779
1780#ifdef CONFIG_APM_DO_ENABLE
1781 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1782 /*
1783 * This call causes my NEC UltraLite Versa 33/C to hang if it
1784 * is booted with PM disabled but not in the docking station.
1785 * Unfortunate ...
1786 */
1787 error = apm_enable_power_management(1);
1788 if (error) {
1789 apm_error("enable power management", error);
1790 return -1;
1791 }
1792 }
1793#endif
1794
1795 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1796 && (apm_info.connection_version > 0x0100)) {
1797 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1798 if (error) {
1799 apm_error("engage power management", error);
1800 return -1;
1801 }
1802 }
1803
1804 if (debug && (num_online_cpus() == 1 || smp)) {
1805 error = apm_get_power_status(&bx, &cx, &dx);
1806 if (error)
1807 printk(KERN_INFO "apm: power status not available\n");
1808 else {
1809 switch ((bx >> 8) & 0xff) {
1810 case 0:
1811 power_stat = "off line";
1812 break;
1813 case 1:
1814 power_stat = "on line";
1815 break;
1816 case 2:
1817 power_stat = "on backup power";
1818 break;
1819 default:
1820 power_stat = "unknown";
1821 break;
1822 }
1823 switch (bx & 0xff) {
1824 case 0:
1825 bat_stat = "high";
1826 break;
1827 case 1:
1828 bat_stat = "low";
1829 break;
1830 case 2:
1831 bat_stat = "critical";
1832 break;
1833 case 3:
1834 bat_stat = "charging";
1835 break;
1836 default:
1837 bat_stat = "unknown";
1838 break;
1839 }
1840 printk(KERN_INFO
1841 "apm: AC %s, battery status %s, battery life ",
1842 power_stat, bat_stat);
1843 if ((cx & 0xff) == 0xff)
1844 printk("unknown\n");
1845 else
1846 printk("%d%%\n", cx & 0xff);
1847 if (apm_info.connection_version > 0x100) {
1848 printk(KERN_INFO
1849 "apm: battery flag 0x%02x, battery life ",
1850 (cx >> 8) & 0xff);
1851 if (dx == 0xffff)
1852 printk("unknown\n");
1853 else
1854 printk("%d %s\n", dx & 0x7fff,
1855 (dx & 0x8000) ?
1856 "minutes" : "seconds");
1857 }
1858 }
1859 }
1860
1861 /* Install our power off handler.. */
1862 if (power_off)
1863 pm_power_off = apm_power_off;
1864
1865 if (num_online_cpus() == 1 || smp) {
1866#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1867 console_blank_hook = apm_console_blank;
1868#endif
1869 apm_mainloop();
1870#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1871 console_blank_hook = NULL;
1872#endif
1873 }
1874
1875 return 0;
1876}
1877
1878#ifndef MODULE
1879static int __init apm_setup(char *str)
1880{
1881 int invert;
1882
1883 while ((str != NULL) && (*str != '\0')) {
1884 if (strncmp(str, "off", 3) == 0)
1885 apm_disabled = 1;
1886 if (strncmp(str, "on", 2) == 0)
1887 apm_disabled = 0;
1888 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1889 (strncmp(str, "bounce_interval=", 16) == 0))
1890 bounce_interval = simple_strtol(str + 16, NULL, 0);
1891 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1892 (strncmp(str, "idle_threshold=", 15) == 0))
1893 idle_threshold = simple_strtol(str + 15, NULL, 0);
1894 if ((strncmp(str, "idle-period=", 12) == 0) ||
1895 (strncmp(str, "idle_period=", 12) == 0))
1896 idle_period = simple_strtol(str + 12, NULL, 0);
1897 invert = (strncmp(str, "no-", 3) == 0) ||
1898 (strncmp(str, "no_", 3) == 0);
1899 if (invert)
1900 str += 3;
1901 if (strncmp(str, "debug", 5) == 0)
1902 debug = !invert;
1903 if ((strncmp(str, "power-off", 9) == 0) ||
1904 (strncmp(str, "power_off", 9) == 0))
1905 power_off = !invert;
1906 if (strncmp(str, "smp", 3) == 0) {
1907 smp = !invert;
1908 idle_threshold = 100;
1909 }
1910 if ((strncmp(str, "allow-ints", 10) == 0) ||
1911 (strncmp(str, "allow_ints", 10) == 0))
1912 apm_info.allow_ints = !invert;
1913 if ((strncmp(str, "broken-psr", 10) == 0) ||
1914 (strncmp(str, "broken_psr", 10) == 0))
1915 apm_info.get_power_status_broken = !invert;
1916 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1917 (strncmp(str, "realmode_power_off", 18) == 0))
1918 apm_info.realmode_power_off = !invert;
1919 str = strchr(str, ',');
1920 if (str != NULL)
1921 str += strspn(str, ", \t");
1922 }
1923 return 1;
1924}
1925
1926__setup("apm=", apm_setup);
1927#endif
1928
1929static const struct file_operations apm_bios_fops = {
1930 .owner = THIS_MODULE,
1931 .read = do_read,
1932 .poll = do_poll,
1933 .unlocked_ioctl = do_ioctl,
1934 .open = do_open,
1935 .release = do_release,
1936 .llseek = noop_llseek,
1937};
1938
1939static struct miscdevice apm_device = {
1940 APM_MINOR_DEV,
1941 "apm_bios",
1942 &apm_bios_fops
1943};
1944
1945
1946/* Simple "print if true" callback */
1947static int __init print_if_true(const struct dmi_system_id *d)
1948{
1949 printk("%s\n", d->ident);
1950 return 0;
1951}
1952
1953/*
1954 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1955 * disabled before the suspend. Linux used to get terribly confused by that.
1956 */
1957static int __init broken_ps2_resume(const struct dmi_system_id *d)
1958{
1959 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1960 "workaround hopefully not needed.\n", d->ident);
1961 return 0;
1962}
1963
1964/* Some bioses have a broken protected mode poweroff and need to use realmode */
1965static int __init set_realmode_power_off(const struct dmi_system_id *d)
1966{
1967 if (apm_info.realmode_power_off == 0) {
1968 apm_info.realmode_power_off = 1;
1969 printk(KERN_INFO "%s bios detected. "
1970 "Using realmode poweroff only.\n", d->ident);
1971 }
1972 return 0;
1973}
1974
1975/* Some laptops require interrupts to be enabled during APM calls */
1976static int __init set_apm_ints(const struct dmi_system_id *d)
1977{
1978 if (apm_info.allow_ints == 0) {
1979 apm_info.allow_ints = 1;
1980 printk(KERN_INFO "%s machine detected. "
1981 "Enabling interrupts during APM calls.\n", d->ident);
1982 }
1983 return 0;
1984}
1985
1986/* Some APM bioses corrupt memory or just plain do not work */
1987static int __init apm_is_horked(const struct dmi_system_id *d)
1988{
1989 if (apm_info.disabled == 0) {
1990 apm_info.disabled = 1;
1991 printk(KERN_INFO "%s machine detected. "
1992 "Disabling APM.\n", d->ident);
1993 }
1994 return 0;
1995}
1996
1997static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1998{
1999 if (apm_info.disabled == 0) {
2000 apm_info.disabled = 1;
2001 printk(KERN_INFO "%s machine detected. "
2002 "Disabling APM.\n", d->ident);
2003 printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
2004 printk(KERN_INFO "download from support.intel.com\n");
2005 }
2006 return 0;
2007}
2008
2009/* Some APM bioses hang on APM idle calls */
2010static int __init apm_likes_to_melt(const struct dmi_system_id *d)
2011{
2012 if (apm_info.forbid_idle == 0) {
2013 apm_info.forbid_idle = 1;
2014 printk(KERN_INFO "%s machine detected. "
2015 "Disabling APM idle calls.\n", d->ident);
2016 }
2017 return 0;
2018}
2019
2020/*
2021 * Check for clue free BIOS implementations who use
2022 * the following QA technique
2023 *
2024 * [ Write BIOS Code ]<------
2025 * | ^
2026 * < Does it Compile >----N--
2027 * |Y ^
2028 * < Does it Boot Win98 >-N--
2029 * |Y
2030 * [Ship It]
2031 *
2032 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
2033 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
2034 */
2035static int __init broken_apm_power(const struct dmi_system_id *d)
2036{
2037 apm_info.get_power_status_broken = 1;
2038 printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2039 "disabling power status reporting.\n");
2040 return 0;
2041}
2042
2043/*
2044 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2045 * have this problem).
2046 */
2047static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2048{
2049 apm_info.get_power_status_swabinminutes = 1;
2050 printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2051 "in minutes and wrong byte order.\n");
2052 return 0;
2053}
2054
2055static struct dmi_system_id __initdata apm_dmi_table[] = {
2056 {
2057 print_if_true,
2058 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2059 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2060 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2061 },
2062 { /* Handle problems with APM on the C600 */
2063 broken_ps2_resume, "Dell Latitude C600",
2064 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2065 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2066 },
2067 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2068 set_apm_ints, "Dell Latitude",
2069 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2070 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2071 },
2072 { /* APM crashes */
2073 apm_is_horked, "Dell Inspiron 2500",
2074 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2075 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2076 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2077 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2078 },
2079 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2080 set_apm_ints, "Dell Inspiron", {
2081 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2082 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2083 },
2084 { /* Handle problems with APM on Inspiron 5000e */
2085 broken_apm_power, "Dell Inspiron 5000e",
2086 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2087 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2088 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2089 },
2090 { /* Handle problems with APM on Inspiron 2500 */
2091 broken_apm_power, "Dell Inspiron 2500",
2092 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2093 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2094 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2095 },
2096 { /* APM crashes */
2097 apm_is_horked, "Dell Dimension 4100",
2098 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2099 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2100 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2101 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2102 },
2103 { /* Allow interrupts during suspend on Compaq Laptops*/
2104 set_apm_ints, "Compaq 12XL125",
2105 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2106 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2107 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2108 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2109 },
2110 { /* Allow interrupts during APM or the clock goes slow */
2111 set_apm_ints, "ASUSTeK",
2112 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2113 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2114 },
2115 { /* APM blows on shutdown */
2116 apm_is_horked, "ABIT KX7-333[R]",
2117 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2118 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2119 },
2120 { /* APM crashes */
2121 apm_is_horked, "Trigem Delhi3",
2122 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2123 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2124 },
2125 { /* APM crashes */
2126 apm_is_horked, "Fujitsu-Siemens",
2127 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2128 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2129 },
2130 { /* APM crashes */
2131 apm_is_horked_d850md, "Intel D850MD",
2132 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2133 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2134 },
2135 { /* APM crashes */
2136 apm_is_horked, "Intel D810EMO",
2137 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2138 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2139 },
2140 { /* APM crashes */
2141 apm_is_horked, "Dell XPS-Z",
2142 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2143 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2144 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2145 },
2146 { /* APM crashes */
2147 apm_is_horked, "Sharp PC-PJ/AX",
2148 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2149 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2150 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2151 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2152 },
2153 { /* APM crashes */
2154 apm_is_horked, "Dell Inspiron 2500",
2155 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2156 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2157 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2158 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2159 },
2160 { /* APM idle hangs */
2161 apm_likes_to_melt, "Jabil AMD",
2162 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2163 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2164 },
2165 { /* APM idle hangs */
2166 apm_likes_to_melt, "AMI Bios",
2167 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2168 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2169 },
2170 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2171 swab_apm_power_in_minutes, "Sony VAIO",
2172 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2173 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2174 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2175 },
2176 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2177 swab_apm_power_in_minutes, "Sony VAIO",
2178 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2179 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2180 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2181 },
2182 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2183 swab_apm_power_in_minutes, "Sony VAIO",
2184 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2185 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2186 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2187 },
2188 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2189 swab_apm_power_in_minutes, "Sony VAIO",
2190 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2191 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2192 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2193 },
2194 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2195 swab_apm_power_in_minutes, "Sony VAIO",
2196 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2197 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2198 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2199 },
2200 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2201 swab_apm_power_in_minutes, "Sony VAIO",
2202 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2203 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2204 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2205 },
2206 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2207 swab_apm_power_in_minutes, "Sony VAIO",
2208 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2209 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2210 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2211 },
2212 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2213 swab_apm_power_in_minutes, "Sony VAIO",
2214 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2215 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2216 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2217 },
2218 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2219 swab_apm_power_in_minutes, "Sony VAIO",
2220 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2221 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2222 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2223 },
2224 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2225 swab_apm_power_in_minutes, "Sony VAIO",
2226 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2227 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2228 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2229 },
2230
2231 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2232 swab_apm_power_in_minutes, "Sony VAIO",
2233 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2234 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2235 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2236 },
2237 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2238 swab_apm_power_in_minutes, "Sony VAIO",
2239 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2240 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2241 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2242 },
2243 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2244 swab_apm_power_in_minutes, "Sony VAIO",
2245 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2246 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2247 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2248 },
2249 { /* broken PM poweroff bios */
2250 set_realmode_power_off, "Award Software v4.60 PGMA",
2251 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2252 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2253 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2254 },
2255
2256 /* Generic per vendor APM settings */
2257
2258 { /* Allow interrupts during suspend on IBM laptops */
2259 set_apm_ints, "IBM",
2260 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2261 },
2262
2263 { }
2264};
2265
2266/*
2267 * Just start the APM thread. We do NOT want to do APM BIOS
2268 * calls from anything but the APM thread, if for no other reason
2269 * than the fact that we don't trust the APM BIOS. This way,
2270 * most common APM BIOS problems that lead to protection errors
2271 * etc will have at least some level of being contained...
2272 *
2273 * In short, if something bad happens, at least we have a choice
2274 * of just killing the apm thread..
2275 */
2276static int __init apm_init(void)
2277{
2278 struct desc_struct *gdt;
2279 int err;
2280
2281 dmi_check_system(apm_dmi_table);
2282
2283 if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) {
2284 printk(KERN_INFO "apm: BIOS not found.\n");
2285 return -ENODEV;
2286 }
2287 printk(KERN_INFO
2288 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2289 ((apm_info.bios.version >> 8) & 0xff),
2290 (apm_info.bios.version & 0xff),
2291 apm_info.bios.flags,
2292 driver_version);
2293 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2294 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2295 return -ENODEV;
2296 }
2297
2298 if (allow_ints)
2299 apm_info.allow_ints = 1;
2300 if (broken_psr)
2301 apm_info.get_power_status_broken = 1;
2302 if (realmode_power_off)
2303 apm_info.realmode_power_off = 1;
2304 /* User can override, but default is to trust DMI */
2305 if (apm_disabled != -1)
2306 apm_info.disabled = apm_disabled;
2307
2308 /*
2309 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2310 * but is reportedly a 1.0 BIOS.
2311 */
2312 if (apm_info.bios.version == 0x001)
2313 apm_info.bios.version = 0x100;
2314
2315 /* BIOS < 1.2 doesn't set cseg_16_len */
2316 if (apm_info.bios.version < 0x102)
2317 apm_info.bios.cseg_16_len = 0; /* 64k */
2318
2319 if (debug) {
2320 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2321 apm_info.bios.cseg, apm_info.bios.offset,
2322 apm_info.bios.cseg_16, apm_info.bios.dseg);
2323 if (apm_info.bios.version > 0x100)
2324 printk(" cseg len %x, dseg len %x",
2325 apm_info.bios.cseg_len,
2326 apm_info.bios.dseg_len);
2327 if (apm_info.bios.version > 0x101)
2328 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2329 printk("\n");
2330 }
2331
2332 if (apm_info.disabled) {
2333 pr_notice("disabled on user request.\n");
2334 return -ENODEV;
2335 }
2336 if ((num_online_cpus() > 1) && !power_off && !smp) {
2337 pr_notice("disabled - APM is not SMP safe.\n");
2338 apm_info.disabled = 1;
2339 return -ENODEV;
2340 }
2341 if (!acpi_disabled) {
2342 pr_notice("overridden by ACPI.\n");
2343 apm_info.disabled = 1;
2344 return -ENODEV;
2345 }
2346
2347 /*
2348 * Set up the long jump entry point to the APM BIOS, which is called
2349 * from inline assembly.
2350 */
2351 apm_bios_entry.offset = apm_info.bios.offset;
2352 apm_bios_entry.segment = APM_CS;
2353
2354 /*
2355 * The APM 1.1 BIOS is supposed to provide limit information that it
2356 * recognizes. Many machines do this correctly, but many others do
2357 * not restrict themselves to their claimed limit. When this happens,
2358 * they will cause a segmentation violation in the kernel at boot time.
2359 * Most BIOS's, however, will respect a 64k limit, so we use that.
2360 *
2361 * Note we only set APM segments on CPU zero, since we pin the APM
2362 * code to that CPU.
2363 */
2364 gdt = get_cpu_gdt_table(0);
2365 set_desc_base(&gdt[APM_CS >> 3],
2366 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2367 set_desc_base(&gdt[APM_CS_16 >> 3],
2368 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2369 set_desc_base(&gdt[APM_DS >> 3],
2370 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2371
2372 proc_create("apm", 0, NULL, &apm_file_ops);
2373
2374 kapmd_task = kthread_create(apm, NULL, "kapmd");
2375 if (IS_ERR(kapmd_task)) {
2376 pr_err("disabled - Unable to start kernel thread\n");
2377 err = PTR_ERR(kapmd_task);
2378 kapmd_task = NULL;
2379 remove_proc_entry("apm", NULL);
2380 return err;
2381 }
2382 wake_up_process(kapmd_task);
2383
2384 if (num_online_cpus() > 1 && !smp) {
2385 printk(KERN_NOTICE
2386 "apm: disabled - APM is not SMP safe (power off active).\n");
2387 return 0;
2388 }
2389
2390 /*
2391 * Note we don't actually care if the misc_device cannot be registered.
2392 * this driver can do its job without it, even if userspace can't
2393 * control it. just log the error
2394 */
2395 if (misc_register(&apm_device))
2396 printk(KERN_WARNING "apm: Could not register misc device.\n");
2397
2398 if (HZ != 100)
2399 idle_period = (idle_period * HZ) / 100;
2400 if (idle_threshold < 100) {
2401 if (!cpuidle_register_driver(&apm_idle_driver))
2402 if (cpuidle_register_device(&apm_cpuidle_device))
2403 cpuidle_unregister_driver(&apm_idle_driver);
2404 }
2405
2406 return 0;
2407}
2408
2409static void __exit apm_exit(void)
2410{
2411 int error;
2412
2413 cpuidle_unregister_device(&apm_cpuidle_device);
2414 cpuidle_unregister_driver(&apm_idle_driver);
2415
2416 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2417 && (apm_info.connection_version > 0x0100)) {
2418 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2419 if (error)
2420 apm_error("disengage power management", error);
2421 }
2422 misc_deregister(&apm_device);
2423 remove_proc_entry("apm", NULL);
2424 if (power_off)
2425 pm_power_off = NULL;
2426 if (kapmd_task) {
2427 kthread_stop(kapmd_task);
2428 kapmd_task = NULL;
2429 }
2430}
2431
2432module_init(apm_init);
2433module_exit(apm_exit);
2434
2435MODULE_AUTHOR("Stephen Rothwell");
2436MODULE_DESCRIPTION("Advanced Power Management");
2437MODULE_LICENSE("GPL");
2438module_param(debug, bool, 0644);
2439MODULE_PARM_DESC(debug, "Enable debug mode");
2440module_param(power_off, bool, 0444);
2441MODULE_PARM_DESC(power_off, "Enable power off");
2442module_param(bounce_interval, int, 0444);
2443MODULE_PARM_DESC(bounce_interval,
2444 "Set the number of ticks to ignore suspend bounces");
2445module_param(allow_ints, bool, 0444);
2446MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2447module_param(broken_psr, bool, 0444);
2448MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2449module_param(realmode_power_off, bool, 0444);
2450MODULE_PARM_DESC(realmode_power_off,
2451 "Switch to real mode before powering off");
2452module_param(idle_threshold, int, 0444);
2453MODULE_PARM_DESC(idle_threshold,
2454 "System idle percentage above which to make APM BIOS idle calls");
2455module_param(idle_period, int, 0444);
2456MODULE_PARM_DESC(idle_period,
2457 "Period (in sec/100) over which to caculate the idle percentage");
2458module_param(smp, bool, 0444);
2459MODULE_PARM_DESC(smp,
2460 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2461MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);