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