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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 <linux/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 .exit_latency = 250, /* WAG */
382 .target_residency = 500, /* WAG */
383 .enter = &apm_cpu_idle
384 },
385 },
386 .state_count = 2,
387};
388
389static struct cpuidle_device apm_cpuidle_device;
390
391/*
392 * Local variables
393 */
394__visible struct {
395 unsigned long offset;
396 unsigned short segment;
397} apm_bios_entry;
398static int clock_slowed;
399static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
400static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
401static int suspends_pending;
402static int standbys_pending;
403static int ignore_sys_suspend;
404static int ignore_normal_resume;
405static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
406
407static bool debug __read_mostly;
408static bool smp __read_mostly;
409static int apm_disabled = -1;
410#ifdef CONFIG_SMP
411static bool power_off;
412#else
413static bool power_off = 1;
414#endif
415static bool realmode_power_off;
416#ifdef CONFIG_APM_ALLOW_INTS
417static bool allow_ints = 1;
418#else
419static bool allow_ints;
420#endif
421static bool broken_psr;
422
423static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
424static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
425static struct apm_user *user_list;
426static DEFINE_SPINLOCK(user_list_lock);
427static DEFINE_MUTEX(apm_mutex);
428
429/*
430 * Set up a segment that references the real mode segment 0x40
431 * that extends up to the end of page zero (that we have reserved).
432 * This is for buggy BIOS's that refer to (real mode) segment 0x40
433 * even though they are called in protected mode.
434 */
435static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
436 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
437
438static const char driver_version[] = "1.16ac"; /* no spaces */
439
440static struct task_struct *kapmd_task;
441
442/*
443 * APM event names taken from the APM 1.2 specification. These are
444 * the message codes that the BIOS uses to tell us about events
445 */
446static const char * const apm_event_name[] = {
447 "system standby",
448 "system suspend",
449 "normal resume",
450 "critical resume",
451 "low battery",
452 "power status change",
453 "update time",
454 "critical suspend",
455 "user standby",
456 "user suspend",
457 "system standby resume",
458 "capabilities change"
459};
460#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
461
462typedef struct lookup_t {
463 int key;
464 char *msg;
465} lookup_t;
466
467/*
468 * The BIOS returns a set of standard error codes in AX when the
469 * carry flag is set.
470 */
471
472static const lookup_t error_table[] = {
473/* N/A { APM_SUCCESS, "Operation succeeded" }, */
474 { APM_DISABLED, "Power management disabled" },
475 { APM_CONNECTED, "Real mode interface already connected" },
476 { APM_NOT_CONNECTED, "Interface not connected" },
477 { APM_16_CONNECTED, "16 bit interface already connected" },
478/* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
479 { APM_32_CONNECTED, "32 bit interface already connected" },
480 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
481 { APM_BAD_DEVICE, "Unrecognized device ID" },
482 { APM_BAD_PARAM, "Parameter out of range" },
483 { APM_NOT_ENGAGED, "Interface not engaged" },
484 { APM_BAD_FUNCTION, "Function not supported" },
485 { APM_RESUME_DISABLED, "Resume timer disabled" },
486 { APM_BAD_STATE, "Unable to enter requested state" },
487/* N/A { APM_NO_EVENTS, "No events pending" }, */
488 { APM_NO_ERROR, "BIOS did not set a return code" },
489 { APM_NOT_PRESENT, "No APM present" }
490};
491#define ERROR_COUNT ARRAY_SIZE(error_table)
492
493/**
494 * apm_error - display an APM error
495 * @str: information string
496 * @err: APM BIOS return code
497 *
498 * Write a meaningful log entry to the kernel log in the event of
499 * an APM error. Note that this also handles (negative) kernel errors.
500 */
501
502static void apm_error(char *str, int err)
503{
504 int i;
505
506 for (i = 0; i < ERROR_COUNT; i++)
507 if (error_table[i].key == err)
508 break;
509 if (i < ERROR_COUNT)
510 pr_notice("%s: %s\n", str, error_table[i].msg);
511 else if (err < 0)
512 pr_notice("%s: linux error code %i\n", str, err);
513 else
514 pr_notice("%s: unknown error code %#2.2x\n",
515 str, err);
516}
517
518/*
519 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
520 * apm_info.allow_ints, we are being really paranoid here! Not only
521 * are interrupts disabled, but all the segment registers (except SS)
522 * are saved and zeroed this means that if the BIOS tries to reference
523 * any data without explicitly loading the segment registers, the kernel
524 * will fault immediately rather than have some unforeseen circumstances
525 * for the rest of the kernel. And it will be very obvious! :-) Doing
526 * this depends on CS referring to the same physical memory as DS so that
527 * DS can be zeroed before the call. Unfortunately, we can't do anything
528 * about the stack segment/pointer. Also, we tell the compiler that
529 * everything could change.
530 *
531 * Also, we KNOW that for the non error case of apm_bios_call, there
532 * is no useful data returned in the low order 8 bits of eax.
533 */
534
535static inline unsigned long __apm_irq_save(void)
536{
537 unsigned long flags;
538 local_save_flags(flags);
539 if (apm_info.allow_ints) {
540 if (irqs_disabled_flags(flags))
541 local_irq_enable();
542 } else
543 local_irq_disable();
544
545 return flags;
546}
547
548#define apm_irq_save(flags) \
549 do { flags = __apm_irq_save(); } while (0)
550
551static inline void apm_irq_restore(unsigned long flags)
552{
553 if (irqs_disabled_flags(flags))
554 local_irq_disable();
555 else if (irqs_disabled())
556 local_irq_enable();
557}
558
559#ifdef APM_ZERO_SEGS
560# define APM_DECL_SEGS \
561 unsigned int saved_fs; unsigned int saved_gs;
562# define APM_DO_SAVE_SEGS \
563 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
564# define APM_DO_RESTORE_SEGS \
565 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
566#else
567# define APM_DECL_SEGS
568# define APM_DO_SAVE_SEGS
569# define APM_DO_RESTORE_SEGS
570#endif
571
572struct apm_bios_call {
573 u32 func;
574 /* In and out */
575 u32 ebx;
576 u32 ecx;
577 /* Out only */
578 u32 eax;
579 u32 edx;
580 u32 esi;
581
582 /* Error: -ENOMEM, or bits 8-15 of eax */
583 int err;
584};
585
586/**
587 * __apm_bios_call - Make an APM BIOS 32bit call
588 * @_call: pointer to struct apm_bios_call.
589 *
590 * Make an APM call using the 32bit protected mode interface. The
591 * caller is responsible for knowing if APM BIOS is configured and
592 * enabled. This call can disable interrupts for a long period of
593 * time on some laptops. The return value is in AH and the carry
594 * flag is loaded into AL. If there is an error, then the error
595 * code is returned in AH (bits 8-15 of eax) and this function
596 * returns non-zero.
597 *
598 * Note: this makes the call on the current CPU.
599 */
600static long __apm_bios_call(void *_call)
601{
602 APM_DECL_SEGS
603 unsigned long flags;
604 int cpu;
605 struct desc_struct save_desc_40;
606 struct desc_struct *gdt;
607 struct apm_bios_call *call = _call;
608
609 cpu = get_cpu();
610 BUG_ON(cpu != 0);
611 gdt = get_cpu_gdt_table(cpu);
612 save_desc_40 = gdt[0x40 / 8];
613 gdt[0x40 / 8] = bad_bios_desc;
614
615 apm_irq_save(flags);
616 APM_DO_SAVE_SEGS;
617 apm_bios_call_asm(call->func, call->ebx, call->ecx,
618 &call->eax, &call->ebx, &call->ecx, &call->edx,
619 &call->esi);
620 APM_DO_RESTORE_SEGS;
621 apm_irq_restore(flags);
622 gdt[0x40 / 8] = save_desc_40;
623 put_cpu();
624
625 return call->eax & 0xff;
626}
627
628/* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
629static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
630{
631 int ret;
632
633 /* Don't bother with work_on_cpu in the common case, so we don't
634 * have to worry about OOM or overhead. */
635 if (get_cpu() == 0) {
636 ret = fn(call);
637 put_cpu();
638 } else {
639 put_cpu();
640 ret = work_on_cpu(0, fn, call);
641 }
642
643 /* work_on_cpu can fail with -ENOMEM */
644 if (ret < 0)
645 call->err = ret;
646 else
647 call->err = (call->eax >> 8) & 0xff;
648
649 return ret;
650}
651
652/**
653 * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0)
654 * @call: the apm_bios_call registers.
655 *
656 * If there is an error, it is returned in @call.err.
657 */
658static int apm_bios_call(struct apm_bios_call *call)
659{
660 return on_cpu0(__apm_bios_call, call);
661}
662
663/**
664 * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
665 * @_call: pointer to struct apm_bios_call.
666 *
667 * Make a BIOS call that returns one value only, or just status.
668 * If there is an error, then the error code is returned in AH
669 * (bits 8-15 of eax) and this function returns non-zero (it can
670 * also return -ENOMEM). This is used for simpler BIOS operations.
671 * This call may hold interrupts off for a long time on some laptops.
672 *
673 * Note: this makes the call on the current CPU.
674 */
675static long __apm_bios_call_simple(void *_call)
676{
677 u8 error;
678 APM_DECL_SEGS
679 unsigned long flags;
680 int cpu;
681 struct desc_struct save_desc_40;
682 struct desc_struct *gdt;
683 struct apm_bios_call *call = _call;
684
685 cpu = get_cpu();
686 BUG_ON(cpu != 0);
687 gdt = get_cpu_gdt_table(cpu);
688 save_desc_40 = gdt[0x40 / 8];
689 gdt[0x40 / 8] = bad_bios_desc;
690
691 apm_irq_save(flags);
692 APM_DO_SAVE_SEGS;
693 error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
694 &call->eax);
695 APM_DO_RESTORE_SEGS;
696 apm_irq_restore(flags);
697 gdt[0x40 / 8] = save_desc_40;
698 put_cpu();
699 return error;
700}
701
702/**
703 * apm_bios_call_simple - make a simple APM BIOS 32bit call
704 * @func: APM function to invoke
705 * @ebx_in: EBX register value for BIOS call
706 * @ecx_in: ECX register value for BIOS call
707 * @eax: EAX register on return from the BIOS call
708 * @err: bits
709 *
710 * Make a BIOS call that returns one value only, or just status.
711 * If there is an error, then the error code is returned in @err
712 * and this function returns non-zero. This is used for simpler
713 * BIOS operations. This call may hold interrupts off for a long
714 * time on some laptops.
715 */
716static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
717 int *err)
718{
719 struct apm_bios_call call;
720 int ret;
721
722 call.func = func;
723 call.ebx = ebx_in;
724 call.ecx = ecx_in;
725
726 ret = on_cpu0(__apm_bios_call_simple, &call);
727 *eax = call.eax;
728 *err = call.err;
729 return ret;
730}
731
732/**
733 * apm_driver_version - APM driver version
734 * @val: loaded with the APM version on return
735 *
736 * Retrieve the APM version supported by the BIOS. This is only
737 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
738 * probably present.
739 *
740 * On entry val should point to a value indicating the APM driver
741 * version with the high byte being the major and the low byte the
742 * minor number both in BCD
743 *
744 * On return it will hold the BIOS revision supported in the
745 * same format.
746 */
747
748static int apm_driver_version(u_short *val)
749{
750 u32 eax;
751 int err;
752
753 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
754 return err;
755 *val = eax;
756 return APM_SUCCESS;
757}
758
759/**
760 * apm_get_event - get an APM event from the BIOS
761 * @event: pointer to the event
762 * @info: point to the event information
763 *
764 * The APM BIOS provides a polled information for event
765 * reporting. The BIOS expects to be polled at least every second
766 * when events are pending. When a message is found the caller should
767 * poll until no more messages are present. However, this causes
768 * problems on some laptops where a suspend event notification is
769 * not cleared until it is acknowledged.
770 *
771 * Additional information is returned in the info pointer, providing
772 * that APM 1.2 is in use. If no messges are pending the value 0x80
773 * is returned (No power management events pending).
774 */
775static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
776{
777 struct apm_bios_call call;
778
779 call.func = APM_FUNC_GET_EVENT;
780 call.ebx = call.ecx = 0;
781
782 if (apm_bios_call(&call))
783 return call.err;
784
785 *event = call.ebx;
786 if (apm_info.connection_version < 0x0102)
787 *info = ~0; /* indicate info not valid */
788 else
789 *info = call.ecx;
790 return APM_SUCCESS;
791}
792
793/**
794 * set_power_state - set the power management state
795 * @what: which items to transition
796 * @state: state to transition to
797 *
798 * Request an APM change of state for one or more system devices. The
799 * processor state must be transitioned last of all. what holds the
800 * class of device in the upper byte and the device number (0xFF for
801 * all) for the object to be transitioned.
802 *
803 * The state holds the state to transition to, which may in fact
804 * be an acceptance of a BIOS requested state change.
805 */
806
807static int set_power_state(u_short what, u_short state)
808{
809 u32 eax;
810 int err;
811
812 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
813 return err;
814 return APM_SUCCESS;
815}
816
817/**
818 * set_system_power_state - set system wide power state
819 * @state: which state to enter
820 *
821 * Transition the entire system into a new APM power state.
822 */
823
824static int set_system_power_state(u_short state)
825{
826 return set_power_state(APM_DEVICE_ALL, state);
827}
828
829/**
830 * apm_do_idle - perform power saving
831 *
832 * This function notifies the BIOS that the processor is (in the view
833 * of the OS) idle. It returns -1 in the event that the BIOS refuses
834 * to handle the idle request. On a success the function returns 1
835 * if the BIOS did clock slowing or 0 otherwise.
836 */
837
838static int apm_do_idle(void)
839{
840 u32 eax;
841 u8 ret = 0;
842 int idled = 0;
843 int err = 0;
844
845 if (!need_resched()) {
846 idled = 1;
847 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
848 }
849
850 if (!idled)
851 return 0;
852
853 if (ret) {
854 static unsigned long t;
855
856 /* This always fails on some SMP boards running UP kernels.
857 * Only report the failure the first 5 times.
858 */
859 if (++t < 5) {
860 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
861 t = jiffies;
862 }
863 return -1;
864 }
865 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
866 return clock_slowed;
867}
868
869/**
870 * apm_do_busy - inform the BIOS the CPU is busy
871 *
872 * Request that the BIOS brings the CPU back to full performance.
873 */
874
875static void apm_do_busy(void)
876{
877 u32 dummy;
878 int err;
879
880 if (clock_slowed || ALWAYS_CALL_BUSY) {
881 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
882 clock_slowed = 0;
883 }
884}
885
886/*
887 * If no process has really been interested in
888 * the CPU for some time, we want to call BIOS
889 * power management - we probably want
890 * to conserve power.
891 */
892#define IDLE_CALC_LIMIT (HZ * 100)
893#define IDLE_LEAKY_MAX 16
894
895/**
896 * apm_cpu_idle - cpu idling for APM capable Linux
897 *
898 * This is the idling function the kernel executes when APM is available. It
899 * tries to do BIOS powermanagement based on the average system idle time.
900 * Furthermore it calls the system default idle routine.
901 */
902
903static int apm_cpu_idle(struct cpuidle_device *dev,
904 struct cpuidle_driver *drv, int index)
905{
906 static int use_apm_idle; /* = 0 */
907 static unsigned int last_jiffies; /* = 0 */
908 static unsigned int last_stime; /* = 0 */
909 cputime_t stime, utime;
910
911 int apm_idle_done = 0;
912 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
913 unsigned int bucket;
914
915recalc:
916 task_cputime(current, &utime, &stime);
917 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
918 use_apm_idle = 0;
919 } else if (jiffies_since_last_check > idle_period) {
920 unsigned int idle_percentage;
921
922 idle_percentage = cputime_to_jiffies(stime - last_stime);
923 idle_percentage *= 100;
924 idle_percentage /= jiffies_since_last_check;
925 use_apm_idle = (idle_percentage > idle_threshold);
926 if (apm_info.forbid_idle)
927 use_apm_idle = 0;
928 }
929
930 last_jiffies = jiffies;
931 last_stime = stime;
932
933 bucket = IDLE_LEAKY_MAX;
934
935 while (!need_resched()) {
936 if (use_apm_idle) {
937 unsigned int t;
938
939 t = jiffies;
940 switch (apm_do_idle()) {
941 case 0:
942 apm_idle_done = 1;
943 if (t != jiffies) {
944 if (bucket) {
945 bucket = IDLE_LEAKY_MAX;
946 continue;
947 }
948 } else if (bucket) {
949 bucket--;
950 continue;
951 }
952 break;
953 case 1:
954 apm_idle_done = 1;
955 break;
956 default: /* BIOS refused */
957 break;
958 }
959 }
960 default_idle();
961 local_irq_disable();
962 jiffies_since_last_check = jiffies - last_jiffies;
963 if (jiffies_since_last_check > idle_period)
964 goto recalc;
965 }
966
967 if (apm_idle_done)
968 apm_do_busy();
969
970 return index;
971}
972
973/**
974 * apm_power_off - ask the BIOS to power off
975 *
976 * Handle the power off sequence. This is the one piece of code we
977 * will execute even on SMP machines. In order to deal with BIOS
978 * bugs we support real mode APM BIOS power off calls. We also make
979 * the SMP call on CPU0 as some systems will only honour this call
980 * on their first cpu.
981 */
982
983static void apm_power_off(void)
984{
985 /* Some bioses don't like being called from CPU != 0 */
986 if (apm_info.realmode_power_off) {
987 set_cpus_allowed_ptr(current, cpumask_of(0));
988 machine_real_restart(MRR_APM);
989 } else {
990 (void)set_system_power_state(APM_STATE_OFF);
991 }
992}
993
994#ifdef CONFIG_APM_DO_ENABLE
995
996/**
997 * apm_enable_power_management - enable BIOS APM power management
998 * @enable: enable yes/no
999 *
1000 * Enable or disable the APM BIOS power services.
1001 */
1002
1003static int apm_enable_power_management(int enable)
1004{
1005 u32 eax;
1006 int err;
1007
1008 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1009 return APM_NOT_ENGAGED;
1010 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1011 enable, &eax, &err))
1012 return err;
1013 if (enable)
1014 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1015 else
1016 apm_info.bios.flags |= APM_BIOS_DISABLED;
1017 return APM_SUCCESS;
1018}
1019#endif
1020
1021/**
1022 * apm_get_power_status - get current power state
1023 * @status: returned status
1024 * @bat: battery info
1025 * @life: estimated life
1026 *
1027 * Obtain the current power status from the APM BIOS. We return a
1028 * status which gives the rough battery status, and current power
1029 * source. The bat value returned give an estimate as a percentage
1030 * of life and a status value for the battery. The estimated life
1031 * if reported is a lifetime in secodnds/minutes at current powwer
1032 * consumption.
1033 */
1034
1035static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1036{
1037 struct apm_bios_call call;
1038
1039 call.func = APM_FUNC_GET_STATUS;
1040 call.ebx = APM_DEVICE_ALL;
1041 call.ecx = 0;
1042
1043 if (apm_info.get_power_status_broken)
1044 return APM_32_UNSUPPORTED;
1045 if (apm_bios_call(&call)) {
1046 if (!call.err)
1047 return APM_NO_ERROR;
1048 return call.err;
1049 }
1050 *status = call.ebx;
1051 *bat = call.ecx;
1052 if (apm_info.get_power_status_swabinminutes) {
1053 *life = swab16((u16)call.edx);
1054 *life |= 0x8000;
1055 } else
1056 *life = call.edx;
1057 return APM_SUCCESS;
1058}
1059
1060#if 0
1061static int apm_get_battery_status(u_short which, u_short *status,
1062 u_short *bat, u_short *life, u_short *nbat)
1063{
1064 u32 eax;
1065 u32 ebx;
1066 u32 ecx;
1067 u32 edx;
1068 u32 esi;
1069
1070 if (apm_info.connection_version < 0x0102) {
1071 /* pretend we only have one battery. */
1072 if (which != 1)
1073 return APM_BAD_DEVICE;
1074 *nbat = 1;
1075 return apm_get_power_status(status, bat, life);
1076 }
1077
1078 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1079 &ebx, &ecx, &edx, &esi))
1080 return (eax >> 8) & 0xff;
1081 *status = ebx;
1082 *bat = ecx;
1083 *life = edx;
1084 *nbat = esi;
1085 return APM_SUCCESS;
1086}
1087#endif
1088
1089/**
1090 * apm_engage_power_management - enable PM on a device
1091 * @device: identity of device
1092 * @enable: on/off
1093 *
1094 * Activate or deactivate power management on either a specific device
1095 * or the entire system (%APM_DEVICE_ALL).
1096 */
1097
1098static int apm_engage_power_management(u_short device, int enable)
1099{
1100 u32 eax;
1101 int err;
1102
1103 if ((enable == 0) && (device == APM_DEVICE_ALL)
1104 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1105 return APM_DISABLED;
1106 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1107 &eax, &err))
1108 return err;
1109 if (device == APM_DEVICE_ALL) {
1110 if (enable)
1111 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1112 else
1113 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1114 }
1115 return APM_SUCCESS;
1116}
1117
1118#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1119
1120/**
1121 * apm_console_blank - blank the display
1122 * @blank: on/off
1123 *
1124 * Attempt to blank the console, firstly by blanking just video device
1125 * zero, and if that fails (some BIOSes don't support it) then it blanks
1126 * all video devices. Typically the BIOS will do laptop backlight and
1127 * monitor powerdown for us.
1128 */
1129
1130static int apm_console_blank(int blank)
1131{
1132 int error = APM_NOT_ENGAGED; /* silence gcc */
1133 int i;
1134 u_short state;
1135 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1136
1137 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1138
1139 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1140 error = set_power_state(dev[i], state);
1141
1142 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1143 return 1;
1144
1145 if (error == APM_NOT_ENGAGED)
1146 break;
1147 }
1148
1149 if (error == APM_NOT_ENGAGED) {
1150 static int tried;
1151 int eng_error;
1152 if (tried++ == 0) {
1153 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1154 if (eng_error) {
1155 apm_error("set display", error);
1156 apm_error("engage interface", eng_error);
1157 return 0;
1158 } else
1159 return apm_console_blank(blank);
1160 }
1161 }
1162 apm_error("set display", error);
1163 return 0;
1164}
1165#endif
1166
1167static int queue_empty(struct apm_user *as)
1168{
1169 return as->event_head == as->event_tail;
1170}
1171
1172static apm_event_t get_queued_event(struct apm_user *as)
1173{
1174 if (++as->event_tail >= APM_MAX_EVENTS)
1175 as->event_tail = 0;
1176 return as->events[as->event_tail];
1177}
1178
1179static void queue_event(apm_event_t event, struct apm_user *sender)
1180{
1181 struct apm_user *as;
1182
1183 spin_lock(&user_list_lock);
1184 if (user_list == NULL)
1185 goto out;
1186 for (as = user_list; as != NULL; as = as->next) {
1187 if ((as == sender) || (!as->reader))
1188 continue;
1189 if (++as->event_head >= APM_MAX_EVENTS)
1190 as->event_head = 0;
1191
1192 if (as->event_head == as->event_tail) {
1193 static int notified;
1194
1195 if (notified++ == 0)
1196 pr_err("an event queue overflowed\n");
1197 if (++as->event_tail >= APM_MAX_EVENTS)
1198 as->event_tail = 0;
1199 }
1200 as->events[as->event_head] = event;
1201 if (!as->suser || !as->writer)
1202 continue;
1203 switch (event) {
1204 case APM_SYS_SUSPEND:
1205 case APM_USER_SUSPEND:
1206 as->suspends_pending++;
1207 suspends_pending++;
1208 break;
1209
1210 case APM_SYS_STANDBY:
1211 case APM_USER_STANDBY:
1212 as->standbys_pending++;
1213 standbys_pending++;
1214 break;
1215 }
1216 }
1217 wake_up_interruptible(&apm_waitqueue);
1218out:
1219 spin_unlock(&user_list_lock);
1220}
1221
1222static void reinit_timer(void)
1223{
1224#ifdef INIT_TIMER_AFTER_SUSPEND
1225 unsigned long flags;
1226
1227 raw_spin_lock_irqsave(&i8253_lock, flags);
1228 /* set the clock to HZ */
1229 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1230 udelay(10);
1231 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1232 udelay(10);
1233 outb_p(LATCH >> 8, PIT_CH0); /* MSB */
1234 udelay(10);
1235 raw_spin_unlock_irqrestore(&i8253_lock, flags);
1236#endif
1237}
1238
1239static int suspend(int vetoable)
1240{
1241 int err;
1242 struct apm_user *as;
1243
1244 dpm_suspend_start(PMSG_SUSPEND);
1245 dpm_suspend_end(PMSG_SUSPEND);
1246
1247 local_irq_disable();
1248 syscore_suspend();
1249
1250 local_irq_enable();
1251
1252 save_processor_state();
1253 err = set_system_power_state(APM_STATE_SUSPEND);
1254 ignore_normal_resume = 1;
1255 restore_processor_state();
1256
1257 local_irq_disable();
1258 reinit_timer();
1259
1260 if (err == APM_NO_ERROR)
1261 err = APM_SUCCESS;
1262 if (err != APM_SUCCESS)
1263 apm_error("suspend", err);
1264 err = (err == APM_SUCCESS) ? 0 : -EIO;
1265
1266 syscore_resume();
1267 local_irq_enable();
1268
1269 dpm_resume_start(PMSG_RESUME);
1270 dpm_resume_end(PMSG_RESUME);
1271
1272 queue_event(APM_NORMAL_RESUME, NULL);
1273 spin_lock(&user_list_lock);
1274 for (as = user_list; as != NULL; as = as->next) {
1275 as->suspend_wait = 0;
1276 as->suspend_result = err;
1277 }
1278 spin_unlock(&user_list_lock);
1279 wake_up_interruptible(&apm_suspend_waitqueue);
1280 return err;
1281}
1282
1283static void standby(void)
1284{
1285 int err;
1286
1287 dpm_suspend_end(PMSG_SUSPEND);
1288
1289 local_irq_disable();
1290 syscore_suspend();
1291 local_irq_enable();
1292
1293 err = set_system_power_state(APM_STATE_STANDBY);
1294 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1295 apm_error("standby", err);
1296
1297 local_irq_disable();
1298 syscore_resume();
1299 local_irq_enable();
1300
1301 dpm_resume_start(PMSG_RESUME);
1302}
1303
1304static apm_event_t get_event(void)
1305{
1306 int error;
1307 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1308 apm_eventinfo_t info;
1309
1310 static int notified;
1311
1312 /* we don't use the eventinfo */
1313 error = apm_get_event(&event, &info);
1314 if (error == APM_SUCCESS)
1315 return event;
1316
1317 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1318 apm_error("get_event", error);
1319
1320 return 0;
1321}
1322
1323static void check_events(void)
1324{
1325 apm_event_t event;
1326 static unsigned long last_resume;
1327 static int ignore_bounce;
1328
1329 while ((event = get_event()) != 0) {
1330 if (debug) {
1331 if (event <= NR_APM_EVENT_NAME)
1332 printk(KERN_DEBUG "apm: received %s notify\n",
1333 apm_event_name[event - 1]);
1334 else
1335 printk(KERN_DEBUG "apm: received unknown "
1336 "event 0x%02x\n", event);
1337 }
1338 if (ignore_bounce
1339 && (time_after(jiffies, last_resume + bounce_interval)))
1340 ignore_bounce = 0;
1341
1342 switch (event) {
1343 case APM_SYS_STANDBY:
1344 case APM_USER_STANDBY:
1345 queue_event(event, NULL);
1346 if (standbys_pending <= 0)
1347 standby();
1348 break;
1349
1350 case APM_USER_SUSPEND:
1351#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1352 if (apm_info.connection_version > 0x100)
1353 set_system_power_state(APM_STATE_REJECT);
1354 break;
1355#endif
1356 case APM_SYS_SUSPEND:
1357 if (ignore_bounce) {
1358 if (apm_info.connection_version > 0x100)
1359 set_system_power_state(APM_STATE_REJECT);
1360 break;
1361 }
1362 /*
1363 * If we are already processing a SUSPEND,
1364 * then further SUSPEND events from the BIOS
1365 * will be ignored. We also return here to
1366 * cope with the fact that the Thinkpads keep
1367 * sending a SUSPEND event until something else
1368 * happens!
1369 */
1370 if (ignore_sys_suspend)
1371 return;
1372 ignore_sys_suspend = 1;
1373 queue_event(event, NULL);
1374 if (suspends_pending <= 0)
1375 (void) suspend(1);
1376 break;
1377
1378 case APM_NORMAL_RESUME:
1379 case APM_CRITICAL_RESUME:
1380 case APM_STANDBY_RESUME:
1381 ignore_sys_suspend = 0;
1382 last_resume = jiffies;
1383 ignore_bounce = 1;
1384 if ((event != APM_NORMAL_RESUME)
1385 || (ignore_normal_resume == 0)) {
1386 dpm_resume_end(PMSG_RESUME);
1387 queue_event(event, NULL);
1388 }
1389 ignore_normal_resume = 0;
1390 break;
1391
1392 case APM_CAPABILITY_CHANGE:
1393 case APM_LOW_BATTERY:
1394 case APM_POWER_STATUS_CHANGE:
1395 queue_event(event, NULL);
1396 /* If needed, notify drivers here */
1397 break;
1398
1399 case APM_UPDATE_TIME:
1400 break;
1401
1402 case APM_CRITICAL_SUSPEND:
1403 /*
1404 * We are not allowed to reject a critical suspend.
1405 */
1406 (void)suspend(0);
1407 break;
1408 }
1409 }
1410}
1411
1412static void apm_event_handler(void)
1413{
1414 static int pending_count = 4;
1415 int err;
1416
1417 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1418 if ((apm_info.connection_version > 0x100) &&
1419 (pending_count-- <= 0)) {
1420 pending_count = 4;
1421 if (debug)
1422 printk(KERN_DEBUG "apm: setting state busy\n");
1423 err = set_system_power_state(APM_STATE_BUSY);
1424 if (err)
1425 apm_error("busy", err);
1426 }
1427 } else
1428 pending_count = 4;
1429 check_events();
1430}
1431
1432/*
1433 * This is the APM thread main loop.
1434 */
1435
1436static void apm_mainloop(void)
1437{
1438 DECLARE_WAITQUEUE(wait, current);
1439
1440 add_wait_queue(&apm_waitqueue, &wait);
1441 set_current_state(TASK_INTERRUPTIBLE);
1442 for (;;) {
1443 schedule_timeout(APM_CHECK_TIMEOUT);
1444 if (kthread_should_stop())
1445 break;
1446 /*
1447 * Ok, check all events, check for idle (and mark us sleeping
1448 * so as not to count towards the load average)..
1449 */
1450 set_current_state(TASK_INTERRUPTIBLE);
1451 apm_event_handler();
1452 }
1453 remove_wait_queue(&apm_waitqueue, &wait);
1454}
1455
1456static int check_apm_user(struct apm_user *as, const char *func)
1457{
1458 if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1459 pr_err("%s passed bad filp\n", func);
1460 return 1;
1461 }
1462 return 0;
1463}
1464
1465static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1466{
1467 struct apm_user *as;
1468 int i;
1469 apm_event_t event;
1470
1471 as = fp->private_data;
1472 if (check_apm_user(as, "read"))
1473 return -EIO;
1474 if ((int)count < sizeof(apm_event_t))
1475 return -EINVAL;
1476 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1477 return -EAGAIN;
1478 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1479 i = count;
1480 while ((i >= sizeof(event)) && !queue_empty(as)) {
1481 event = get_queued_event(as);
1482 if (copy_to_user(buf, &event, sizeof(event))) {
1483 if (i < count)
1484 break;
1485 return -EFAULT;
1486 }
1487 switch (event) {
1488 case APM_SYS_SUSPEND:
1489 case APM_USER_SUSPEND:
1490 as->suspends_read++;
1491 break;
1492
1493 case APM_SYS_STANDBY:
1494 case APM_USER_STANDBY:
1495 as->standbys_read++;
1496 break;
1497 }
1498 buf += sizeof(event);
1499 i -= sizeof(event);
1500 }
1501 if (i < count)
1502 return count - i;
1503 if (signal_pending(current))
1504 return -ERESTARTSYS;
1505 return 0;
1506}
1507
1508static unsigned int do_poll(struct file *fp, poll_table *wait)
1509{
1510 struct apm_user *as;
1511
1512 as = fp->private_data;
1513 if (check_apm_user(as, "poll"))
1514 return 0;
1515 poll_wait(fp, &apm_waitqueue, wait);
1516 if (!queue_empty(as))
1517 return POLLIN | POLLRDNORM;
1518 return 0;
1519}
1520
1521static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1522{
1523 struct apm_user *as;
1524 int ret;
1525
1526 as = filp->private_data;
1527 if (check_apm_user(as, "ioctl"))
1528 return -EIO;
1529 if (!as->suser || !as->writer)
1530 return -EPERM;
1531 switch (cmd) {
1532 case APM_IOC_STANDBY:
1533 mutex_lock(&apm_mutex);
1534 if (as->standbys_read > 0) {
1535 as->standbys_read--;
1536 as->standbys_pending--;
1537 standbys_pending--;
1538 } else
1539 queue_event(APM_USER_STANDBY, as);
1540 if (standbys_pending <= 0)
1541 standby();
1542 mutex_unlock(&apm_mutex);
1543 break;
1544 case APM_IOC_SUSPEND:
1545 mutex_lock(&apm_mutex);
1546 if (as->suspends_read > 0) {
1547 as->suspends_read--;
1548 as->suspends_pending--;
1549 suspends_pending--;
1550 } else
1551 queue_event(APM_USER_SUSPEND, as);
1552 if (suspends_pending <= 0) {
1553 ret = suspend(1);
1554 mutex_unlock(&apm_mutex);
1555 } else {
1556 as->suspend_wait = 1;
1557 mutex_unlock(&apm_mutex);
1558 wait_event_interruptible(apm_suspend_waitqueue,
1559 as->suspend_wait == 0);
1560 ret = as->suspend_result;
1561 }
1562 return ret;
1563 default:
1564 return -ENOTTY;
1565 }
1566 return 0;
1567}
1568
1569static int do_release(struct inode *inode, struct file *filp)
1570{
1571 struct apm_user *as;
1572
1573 as = filp->private_data;
1574 if (check_apm_user(as, "release"))
1575 return 0;
1576 filp->private_data = NULL;
1577 if (as->standbys_pending > 0) {
1578 standbys_pending -= as->standbys_pending;
1579 if (standbys_pending <= 0)
1580 standby();
1581 }
1582 if (as->suspends_pending > 0) {
1583 suspends_pending -= as->suspends_pending;
1584 if (suspends_pending <= 0)
1585 (void) suspend(1);
1586 }
1587 spin_lock(&user_list_lock);
1588 if (user_list == as)
1589 user_list = as->next;
1590 else {
1591 struct apm_user *as1;
1592
1593 for (as1 = user_list;
1594 (as1 != NULL) && (as1->next != as);
1595 as1 = as1->next)
1596 ;
1597 if (as1 == NULL)
1598 pr_err("filp not in user list\n");
1599 else
1600 as1->next = as->next;
1601 }
1602 spin_unlock(&user_list_lock);
1603 kfree(as);
1604 return 0;
1605}
1606
1607static int do_open(struct inode *inode, struct file *filp)
1608{
1609 struct apm_user *as;
1610
1611 as = kmalloc(sizeof(*as), GFP_KERNEL);
1612 if (as == NULL)
1613 return -ENOMEM;
1614
1615 as->magic = APM_BIOS_MAGIC;
1616 as->event_tail = as->event_head = 0;
1617 as->suspends_pending = as->standbys_pending = 0;
1618 as->suspends_read = as->standbys_read = 0;
1619 /*
1620 * XXX - this is a tiny bit broken, when we consider BSD
1621 * process accounting. If the device is opened by root, we
1622 * instantly flag that we used superuser privs. Who knows,
1623 * we might close the device immediately without doing a
1624 * privileged operation -- cevans
1625 */
1626 as->suser = capable(CAP_SYS_ADMIN);
1627 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1628 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1629 spin_lock(&user_list_lock);
1630 as->next = user_list;
1631 user_list = as;
1632 spin_unlock(&user_list_lock);
1633 filp->private_data = as;
1634 return 0;
1635}
1636
1637static int proc_apm_show(struct seq_file *m, void *v)
1638{
1639 unsigned short bx;
1640 unsigned short cx;
1641 unsigned short dx;
1642 int error;
1643 unsigned short ac_line_status = 0xff;
1644 unsigned short battery_status = 0xff;
1645 unsigned short battery_flag = 0xff;
1646 int percentage = -1;
1647 int time_units = -1;
1648 char *units = "?";
1649
1650 if ((num_online_cpus() == 1) &&
1651 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1652 ac_line_status = (bx >> 8) & 0xff;
1653 battery_status = bx & 0xff;
1654 if ((cx & 0xff) != 0xff)
1655 percentage = cx & 0xff;
1656
1657 if (apm_info.connection_version > 0x100) {
1658 battery_flag = (cx >> 8) & 0xff;
1659 if (dx != 0xffff) {
1660 units = (dx & 0x8000) ? "min" : "sec";
1661 time_units = dx & 0x7fff;
1662 }
1663 }
1664 }
1665 /* Arguments, with symbols from linux/apm_bios.h. Information is
1666 from the Get Power Status (0x0a) call unless otherwise noted.
1667
1668 0) Linux driver version (this will change if format changes)
1669 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1670 2) APM flags from APM Installation Check (0x00):
1671 bit 0: APM_16_BIT_SUPPORT
1672 bit 1: APM_32_BIT_SUPPORT
1673 bit 2: APM_IDLE_SLOWS_CLOCK
1674 bit 3: APM_BIOS_DISABLED
1675 bit 4: APM_BIOS_DISENGAGED
1676 3) AC line status
1677 0x00: Off-line
1678 0x01: On-line
1679 0x02: On backup power (BIOS >= 1.1 only)
1680 0xff: Unknown
1681 4) Battery status
1682 0x00: High
1683 0x01: Low
1684 0x02: Critical
1685 0x03: Charging
1686 0x04: Selected battery not present (BIOS >= 1.2 only)
1687 0xff: Unknown
1688 5) Battery flag
1689 bit 0: High
1690 bit 1: Low
1691 bit 2: Critical
1692 bit 3: Charging
1693 bit 7: No system battery
1694 0xff: Unknown
1695 6) Remaining battery life (percentage of charge):
1696 0-100: valid
1697 -1: Unknown
1698 7) Remaining battery life (time units):
1699 Number of remaining minutes or seconds
1700 -1: Unknown
1701 8) min = minutes; sec = seconds */
1702
1703 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1704 driver_version,
1705 (apm_info.bios.version >> 8) & 0xff,
1706 apm_info.bios.version & 0xff,
1707 apm_info.bios.flags,
1708 ac_line_status,
1709 battery_status,
1710 battery_flag,
1711 percentage,
1712 time_units,
1713 units);
1714 return 0;
1715}
1716
1717static int proc_apm_open(struct inode *inode, struct file *file)
1718{
1719 return single_open(file, proc_apm_show, NULL);
1720}
1721
1722static const struct file_operations apm_file_ops = {
1723 .owner = THIS_MODULE,
1724 .open = proc_apm_open,
1725 .read = seq_read,
1726 .llseek = seq_lseek,
1727 .release = single_release,
1728};
1729
1730static int apm(void *unused)
1731{
1732 unsigned short bx;
1733 unsigned short cx;
1734 unsigned short dx;
1735 int error;
1736 char *power_stat;
1737 char *bat_stat;
1738
1739 /* 2002/08/01 - WT
1740 * This is to avoid random crashes at boot time during initialization
1741 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1742 * Some bioses don't like being called from CPU != 0.
1743 * Method suggested by Ingo Molnar.
1744 */
1745 set_cpus_allowed_ptr(current, cpumask_of(0));
1746 BUG_ON(smp_processor_id() != 0);
1747
1748 if (apm_info.connection_version == 0) {
1749 apm_info.connection_version = apm_info.bios.version;
1750 if (apm_info.connection_version > 0x100) {
1751 /*
1752 * We only support BIOSs up to version 1.2
1753 */
1754 if (apm_info.connection_version > 0x0102)
1755 apm_info.connection_version = 0x0102;
1756 error = apm_driver_version(&apm_info.connection_version);
1757 if (error != APM_SUCCESS) {
1758 apm_error("driver version", error);
1759 /* Fall back to an APM 1.0 connection. */
1760 apm_info.connection_version = 0x100;
1761 }
1762 }
1763 }
1764
1765 if (debug)
1766 printk(KERN_INFO "apm: Connection version %d.%d\n",
1767 (apm_info.connection_version >> 8) & 0xff,
1768 apm_info.connection_version & 0xff);
1769
1770#ifdef CONFIG_APM_DO_ENABLE
1771 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1772 /*
1773 * This call causes my NEC UltraLite Versa 33/C to hang if it
1774 * is booted with PM disabled but not in the docking station.
1775 * Unfortunate ...
1776 */
1777 error = apm_enable_power_management(1);
1778 if (error) {
1779 apm_error("enable power management", error);
1780 return -1;
1781 }
1782 }
1783#endif
1784
1785 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1786 && (apm_info.connection_version > 0x0100)) {
1787 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1788 if (error) {
1789 apm_error("engage power management", error);
1790 return -1;
1791 }
1792 }
1793
1794 if (debug && (num_online_cpus() == 1 || smp)) {
1795 error = apm_get_power_status(&bx, &cx, &dx);
1796 if (error)
1797 printk(KERN_INFO "apm: power status not available\n");
1798 else {
1799 switch ((bx >> 8) & 0xff) {
1800 case 0:
1801 power_stat = "off line";
1802 break;
1803 case 1:
1804 power_stat = "on line";
1805 break;
1806 case 2:
1807 power_stat = "on backup power";
1808 break;
1809 default:
1810 power_stat = "unknown";
1811 break;
1812 }
1813 switch (bx & 0xff) {
1814 case 0:
1815 bat_stat = "high";
1816 break;
1817 case 1:
1818 bat_stat = "low";
1819 break;
1820 case 2:
1821 bat_stat = "critical";
1822 break;
1823 case 3:
1824 bat_stat = "charging";
1825 break;
1826 default:
1827 bat_stat = "unknown";
1828 break;
1829 }
1830 printk(KERN_INFO
1831 "apm: AC %s, battery status %s, battery life ",
1832 power_stat, bat_stat);
1833 if ((cx & 0xff) == 0xff)
1834 printk("unknown\n");
1835 else
1836 printk("%d%%\n", cx & 0xff);
1837 if (apm_info.connection_version > 0x100) {
1838 printk(KERN_INFO
1839 "apm: battery flag 0x%02x, battery life ",
1840 (cx >> 8) & 0xff);
1841 if (dx == 0xffff)
1842 printk("unknown\n");
1843 else
1844 printk("%d %s\n", dx & 0x7fff,
1845 (dx & 0x8000) ?
1846 "minutes" : "seconds");
1847 }
1848 }
1849 }
1850
1851 /* Install our power off handler.. */
1852 if (power_off)
1853 pm_power_off = apm_power_off;
1854
1855 if (num_online_cpus() == 1 || smp) {
1856#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1857 console_blank_hook = apm_console_blank;
1858#endif
1859 apm_mainloop();
1860#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1861 console_blank_hook = NULL;
1862#endif
1863 }
1864
1865 return 0;
1866}
1867
1868#ifndef MODULE
1869static int __init apm_setup(char *str)
1870{
1871 int invert;
1872
1873 while ((str != NULL) && (*str != '\0')) {
1874 if (strncmp(str, "off", 3) == 0)
1875 apm_disabled = 1;
1876 if (strncmp(str, "on", 2) == 0)
1877 apm_disabled = 0;
1878 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1879 (strncmp(str, "bounce_interval=", 16) == 0))
1880 bounce_interval = simple_strtol(str + 16, NULL, 0);
1881 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1882 (strncmp(str, "idle_threshold=", 15) == 0))
1883 idle_threshold = simple_strtol(str + 15, NULL, 0);
1884 if ((strncmp(str, "idle-period=", 12) == 0) ||
1885 (strncmp(str, "idle_period=", 12) == 0))
1886 idle_period = simple_strtol(str + 12, NULL, 0);
1887 invert = (strncmp(str, "no-", 3) == 0) ||
1888 (strncmp(str, "no_", 3) == 0);
1889 if (invert)
1890 str += 3;
1891 if (strncmp(str, "debug", 5) == 0)
1892 debug = !invert;
1893 if ((strncmp(str, "power-off", 9) == 0) ||
1894 (strncmp(str, "power_off", 9) == 0))
1895 power_off = !invert;
1896 if (strncmp(str, "smp", 3) == 0) {
1897 smp = !invert;
1898 idle_threshold = 100;
1899 }
1900 if ((strncmp(str, "allow-ints", 10) == 0) ||
1901 (strncmp(str, "allow_ints", 10) == 0))
1902 apm_info.allow_ints = !invert;
1903 if ((strncmp(str, "broken-psr", 10) == 0) ||
1904 (strncmp(str, "broken_psr", 10) == 0))
1905 apm_info.get_power_status_broken = !invert;
1906 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1907 (strncmp(str, "realmode_power_off", 18) == 0))
1908 apm_info.realmode_power_off = !invert;
1909 str = strchr(str, ',');
1910 if (str != NULL)
1911 str += strspn(str, ", \t");
1912 }
1913 return 1;
1914}
1915
1916__setup("apm=", apm_setup);
1917#endif
1918
1919static const struct file_operations apm_bios_fops = {
1920 .owner = THIS_MODULE,
1921 .read = do_read,
1922 .poll = do_poll,
1923 .unlocked_ioctl = do_ioctl,
1924 .open = do_open,
1925 .release = do_release,
1926 .llseek = noop_llseek,
1927};
1928
1929static struct miscdevice apm_device = {
1930 APM_MINOR_DEV,
1931 "apm_bios",
1932 &apm_bios_fops
1933};
1934
1935
1936/* Simple "print if true" callback */
1937static int __init print_if_true(const struct dmi_system_id *d)
1938{
1939 printk("%s\n", d->ident);
1940 return 0;
1941}
1942
1943/*
1944 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1945 * disabled before the suspend. Linux used to get terribly confused by that.
1946 */
1947static int __init broken_ps2_resume(const struct dmi_system_id *d)
1948{
1949 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1950 "workaround hopefully not needed.\n", d->ident);
1951 return 0;
1952}
1953
1954/* Some bioses have a broken protected mode poweroff and need to use realmode */
1955static int __init set_realmode_power_off(const struct dmi_system_id *d)
1956{
1957 if (apm_info.realmode_power_off == 0) {
1958 apm_info.realmode_power_off = 1;
1959 printk(KERN_INFO "%s bios detected. "
1960 "Using realmode poweroff only.\n", d->ident);
1961 }
1962 return 0;
1963}
1964
1965/* Some laptops require interrupts to be enabled during APM calls */
1966static int __init set_apm_ints(const struct dmi_system_id *d)
1967{
1968 if (apm_info.allow_ints == 0) {
1969 apm_info.allow_ints = 1;
1970 printk(KERN_INFO "%s machine detected. "
1971 "Enabling interrupts during APM calls.\n", d->ident);
1972 }
1973 return 0;
1974}
1975
1976/* Some APM bioses corrupt memory or just plain do not work */
1977static int __init apm_is_horked(const struct dmi_system_id *d)
1978{
1979 if (apm_info.disabled == 0) {
1980 apm_info.disabled = 1;
1981 printk(KERN_INFO "%s machine detected. "
1982 "Disabling APM.\n", d->ident);
1983 }
1984 return 0;
1985}
1986
1987static int __init apm_is_horked_d850md(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 printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
1994 printk(KERN_INFO "download from support.intel.com\n");
1995 }
1996 return 0;
1997}
1998
1999/* Some APM bioses hang on APM idle calls */
2000static int __init apm_likes_to_melt(const struct dmi_system_id *d)
2001{
2002 if (apm_info.forbid_idle == 0) {
2003 apm_info.forbid_idle = 1;
2004 printk(KERN_INFO "%s machine detected. "
2005 "Disabling APM idle calls.\n", d->ident);
2006 }
2007 return 0;
2008}
2009
2010/*
2011 * Check for clue free BIOS implementations who use
2012 * the following QA technique
2013 *
2014 * [ Write BIOS Code ]<------
2015 * | ^
2016 * < Does it Compile >----N--
2017 * |Y ^
2018 * < Does it Boot Win98 >-N--
2019 * |Y
2020 * [Ship It]
2021 *
2022 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
2023 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
2024 */
2025static int __init broken_apm_power(const struct dmi_system_id *d)
2026{
2027 apm_info.get_power_status_broken = 1;
2028 printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2029 "disabling power status reporting.\n");
2030 return 0;
2031}
2032
2033/*
2034 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2035 * have this problem).
2036 */
2037static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2038{
2039 apm_info.get_power_status_swabinminutes = 1;
2040 printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2041 "in minutes and wrong byte order.\n");
2042 return 0;
2043}
2044
2045static struct dmi_system_id __initdata apm_dmi_table[] = {
2046 {
2047 print_if_true,
2048 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2049 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2050 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2051 },
2052 { /* Handle problems with APM on the C600 */
2053 broken_ps2_resume, "Dell Latitude C600",
2054 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2055 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2056 },
2057 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2058 set_apm_ints, "Dell Latitude",
2059 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2060 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2061 },
2062 { /* APM crashes */
2063 apm_is_horked, "Dell Inspiron 2500",
2064 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2065 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2066 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2067 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2068 },
2069 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2070 set_apm_ints, "Dell Inspiron", {
2071 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2072 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2073 },
2074 { /* Handle problems with APM on Inspiron 5000e */
2075 broken_apm_power, "Dell Inspiron 5000e",
2076 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2077 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2078 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2079 },
2080 { /* Handle problems with APM on Inspiron 2500 */
2081 broken_apm_power, "Dell Inspiron 2500",
2082 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2083 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2084 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2085 },
2086 { /* APM crashes */
2087 apm_is_horked, "Dell Dimension 4100",
2088 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2089 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2090 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2091 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2092 },
2093 { /* Allow interrupts during suspend on Compaq Laptops*/
2094 set_apm_ints, "Compaq 12XL125",
2095 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2096 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2097 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2098 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2099 },
2100 { /* Allow interrupts during APM or the clock goes slow */
2101 set_apm_ints, "ASUSTeK",
2102 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2103 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2104 },
2105 { /* APM blows on shutdown */
2106 apm_is_horked, "ABIT KX7-333[R]",
2107 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2108 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2109 },
2110 { /* APM crashes */
2111 apm_is_horked, "Trigem Delhi3",
2112 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2113 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2114 },
2115 { /* APM crashes */
2116 apm_is_horked, "Fujitsu-Siemens",
2117 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2118 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2119 },
2120 { /* APM crashes */
2121 apm_is_horked_d850md, "Intel D850MD",
2122 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2123 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2124 },
2125 { /* APM crashes */
2126 apm_is_horked, "Intel D810EMO",
2127 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2128 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2129 },
2130 { /* APM crashes */
2131 apm_is_horked, "Dell XPS-Z",
2132 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2133 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2134 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2135 },
2136 { /* APM crashes */
2137 apm_is_horked, "Sharp PC-PJ/AX",
2138 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2139 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2140 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2141 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2142 },
2143 { /* APM crashes */
2144 apm_is_horked, "Dell Inspiron 2500",
2145 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2146 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2147 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2148 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2149 },
2150 { /* APM idle hangs */
2151 apm_likes_to_melt, "Jabil AMD",
2152 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2153 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2154 },
2155 { /* APM idle hangs */
2156 apm_likes_to_melt, "AMI Bios",
2157 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2158 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2159 },
2160 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2161 swab_apm_power_in_minutes, "Sony VAIO",
2162 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2163 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2164 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2165 },
2166 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2167 swab_apm_power_in_minutes, "Sony VAIO",
2168 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2169 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2170 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2171 },
2172 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2173 swab_apm_power_in_minutes, "Sony VAIO",
2174 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2175 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2176 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2177 },
2178 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2179 swab_apm_power_in_minutes, "Sony VAIO",
2180 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2181 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2182 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2183 },
2184 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2185 swab_apm_power_in_minutes, "Sony VAIO",
2186 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2187 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2188 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2189 },
2190 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2191 swab_apm_power_in_minutes, "Sony VAIO",
2192 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2193 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2194 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2195 },
2196 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2197 swab_apm_power_in_minutes, "Sony VAIO",
2198 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2199 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2200 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2201 },
2202 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2203 swab_apm_power_in_minutes, "Sony VAIO",
2204 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2205 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2206 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2207 },
2208 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2209 swab_apm_power_in_minutes, "Sony VAIO",
2210 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2211 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2212 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2213 },
2214 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2215 swab_apm_power_in_minutes, "Sony VAIO",
2216 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2217 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2218 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2219 },
2220
2221 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2222 swab_apm_power_in_minutes, "Sony VAIO",
2223 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2224 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2225 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2226 },
2227 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2228 swab_apm_power_in_minutes, "Sony VAIO",
2229 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2230 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2231 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2232 },
2233 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2234 swab_apm_power_in_minutes, "Sony VAIO",
2235 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2236 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2237 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2238 },
2239 { /* broken PM poweroff bios */
2240 set_realmode_power_off, "Award Software v4.60 PGMA",
2241 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2242 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2243 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2244 },
2245
2246 /* Generic per vendor APM settings */
2247
2248 { /* Allow interrupts during suspend on IBM laptops */
2249 set_apm_ints, "IBM",
2250 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2251 },
2252
2253 { }
2254};
2255
2256/*
2257 * Just start the APM thread. We do NOT want to do APM BIOS
2258 * calls from anything but the APM thread, if for no other reason
2259 * than the fact that we don't trust the APM BIOS. This way,
2260 * most common APM BIOS problems that lead to protection errors
2261 * etc will have at least some level of being contained...
2262 *
2263 * In short, if something bad happens, at least we have a choice
2264 * of just killing the apm thread..
2265 */
2266static int __init apm_init(void)
2267{
2268 struct desc_struct *gdt;
2269 int err;
2270
2271 dmi_check_system(apm_dmi_table);
2272
2273 if (apm_info.bios.version == 0 || machine_is_olpc()) {
2274 printk(KERN_INFO "apm: BIOS not found.\n");
2275 return -ENODEV;
2276 }
2277 printk(KERN_INFO
2278 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2279 ((apm_info.bios.version >> 8) & 0xff),
2280 (apm_info.bios.version & 0xff),
2281 apm_info.bios.flags,
2282 driver_version);
2283 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2284 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2285 return -ENODEV;
2286 }
2287
2288 if (allow_ints)
2289 apm_info.allow_ints = 1;
2290 if (broken_psr)
2291 apm_info.get_power_status_broken = 1;
2292 if (realmode_power_off)
2293 apm_info.realmode_power_off = 1;
2294 /* User can override, but default is to trust DMI */
2295 if (apm_disabled != -1)
2296 apm_info.disabled = apm_disabled;
2297
2298 /*
2299 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2300 * but is reportedly a 1.0 BIOS.
2301 */
2302 if (apm_info.bios.version == 0x001)
2303 apm_info.bios.version = 0x100;
2304
2305 /* BIOS < 1.2 doesn't set cseg_16_len */
2306 if (apm_info.bios.version < 0x102)
2307 apm_info.bios.cseg_16_len = 0; /* 64k */
2308
2309 if (debug) {
2310 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2311 apm_info.bios.cseg, apm_info.bios.offset,
2312 apm_info.bios.cseg_16, apm_info.bios.dseg);
2313 if (apm_info.bios.version > 0x100)
2314 printk(" cseg len %x, dseg len %x",
2315 apm_info.bios.cseg_len,
2316 apm_info.bios.dseg_len);
2317 if (apm_info.bios.version > 0x101)
2318 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2319 printk("\n");
2320 }
2321
2322 if (apm_info.disabled) {
2323 pr_notice("disabled on user request.\n");
2324 return -ENODEV;
2325 }
2326 if ((num_online_cpus() > 1) && !power_off && !smp) {
2327 pr_notice("disabled - APM is not SMP safe.\n");
2328 apm_info.disabled = 1;
2329 return -ENODEV;
2330 }
2331 if (!acpi_disabled) {
2332 pr_notice("overridden by ACPI.\n");
2333 apm_info.disabled = 1;
2334 return -ENODEV;
2335 }
2336
2337 /*
2338 * Set up the long jump entry point to the APM BIOS, which is called
2339 * from inline assembly.
2340 */
2341 apm_bios_entry.offset = apm_info.bios.offset;
2342 apm_bios_entry.segment = APM_CS;
2343
2344 /*
2345 * The APM 1.1 BIOS is supposed to provide limit information that it
2346 * recognizes. Many machines do this correctly, but many others do
2347 * not restrict themselves to their claimed limit. When this happens,
2348 * they will cause a segmentation violation in the kernel at boot time.
2349 * Most BIOS's, however, will respect a 64k limit, so we use that.
2350 *
2351 * Note we only set APM segments on CPU zero, since we pin the APM
2352 * code to that CPU.
2353 */
2354 gdt = get_cpu_gdt_table(0);
2355 set_desc_base(&gdt[APM_CS >> 3],
2356 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2357 set_desc_base(&gdt[APM_CS_16 >> 3],
2358 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2359 set_desc_base(&gdt[APM_DS >> 3],
2360 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2361
2362 proc_create("apm", 0, NULL, &apm_file_ops);
2363
2364 kapmd_task = kthread_create(apm, NULL, "kapmd");
2365 if (IS_ERR(kapmd_task)) {
2366 pr_err("disabled - Unable to start kernel thread\n");
2367 err = PTR_ERR(kapmd_task);
2368 kapmd_task = NULL;
2369 remove_proc_entry("apm", NULL);
2370 return err;
2371 }
2372 wake_up_process(kapmd_task);
2373
2374 if (num_online_cpus() > 1 && !smp) {
2375 printk(KERN_NOTICE
2376 "apm: disabled - APM is not SMP safe (power off active).\n");
2377 return 0;
2378 }
2379
2380 /*
2381 * Note we don't actually care if the misc_device cannot be registered.
2382 * this driver can do its job without it, even if userspace can't
2383 * control it. just log the error
2384 */
2385 if (misc_register(&apm_device))
2386 printk(KERN_WARNING "apm: Could not register misc device.\n");
2387
2388 if (HZ != 100)
2389 idle_period = (idle_period * HZ) / 100;
2390 if (idle_threshold < 100) {
2391 if (!cpuidle_register_driver(&apm_idle_driver))
2392 if (cpuidle_register_device(&apm_cpuidle_device))
2393 cpuidle_unregister_driver(&apm_idle_driver);
2394 }
2395
2396 return 0;
2397}
2398
2399static void __exit apm_exit(void)
2400{
2401 int error;
2402
2403 cpuidle_unregister_device(&apm_cpuidle_device);
2404 cpuidle_unregister_driver(&apm_idle_driver);
2405
2406 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2407 && (apm_info.connection_version > 0x0100)) {
2408 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2409 if (error)
2410 apm_error("disengage power management", error);
2411 }
2412 misc_deregister(&apm_device);
2413 remove_proc_entry("apm", NULL);
2414 if (power_off)
2415 pm_power_off = NULL;
2416 if (kapmd_task) {
2417 kthread_stop(kapmd_task);
2418 kapmd_task = NULL;
2419 }
2420}
2421
2422module_init(apm_init);
2423module_exit(apm_exit);
2424
2425MODULE_AUTHOR("Stephen Rothwell");
2426MODULE_DESCRIPTION("Advanced Power Management");
2427MODULE_LICENSE("GPL");
2428module_param(debug, bool, 0644);
2429MODULE_PARM_DESC(debug, "Enable debug mode");
2430module_param(power_off, bool, 0444);
2431MODULE_PARM_DESC(power_off, "Enable power off");
2432module_param(bounce_interval, int, 0444);
2433MODULE_PARM_DESC(bounce_interval,
2434 "Set the number of ticks to ignore suspend bounces");
2435module_param(allow_ints, bool, 0444);
2436MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2437module_param(broken_psr, bool, 0444);
2438MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2439module_param(realmode_power_off, bool, 0444);
2440MODULE_PARM_DESC(realmode_power_off,
2441 "Switch to real mode before powering off");
2442module_param(idle_threshold, int, 0444);
2443MODULE_PARM_DESC(idle_threshold,
2444 "System idle percentage above which to make APM BIOS idle calls");
2445module_param(idle_period, int, 0444);
2446MODULE_PARM_DESC(idle_period,
2447 "Period (in sec/100) over which to caculate the idle percentage");
2448module_param(smp, bool, 0444);
2449MODULE_PARM_DESC(smp,
2450 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2451MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);