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