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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// SPDX-License-Identifier: GPL-2.0-or-later
2/* -*- linux-c -*-
3 * APM BIOS driver for Linux
4 * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
5 *
6 * Initial development of this driver was funded by NEC Australia P/L
7 * and NEC Corporation
8 *
9 * October 1995, Rik Faith (faith@cs.unc.edu):
10 * Minor enhancements and updates (to the patch set) for 1.3.x
11 * Documentation
12 * January 1996, Rik Faith (faith@cs.unc.edu):
13 * Make /proc/apm easy to format (bump driver version)
14 * March 1996, Rik Faith (faith@cs.unc.edu):
15 * Prohibit APM BIOS calls unless apm_enabled.
16 * (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>)
17 * April 1996, Stephen Rothwell (sfr@canb.auug.org.au)
18 * Version 1.0 and 1.1
19 * May 1996, Version 1.2
20 * Feb 1998, Version 1.3
21 * Feb 1998, Version 1.4
22 * Aug 1998, Version 1.5
23 * Sep 1998, Version 1.6
24 * Nov 1998, Version 1.7
25 * Jan 1999, Version 1.8
26 * Jan 1999, Version 1.9
27 * Oct 1999, Version 1.10
28 * Nov 1999, Version 1.11
29 * Jan 2000, Version 1.12
30 * Feb 2000, Version 1.13
31 * Nov 2000, Version 1.14
32 * Oct 2001, Version 1.15
33 * Jan 2002, Version 1.16
34 * Oct 2002, Version 1.16ac
35 *
36 * History:
37 * 0.6b: first version in official kernel, Linux 1.3.46
38 * 0.7: changed /proc/apm format, Linux 1.3.58
39 * 0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59
40 * 0.9: only call bios if bios is present, Linux 1.3.72
41 * 1.0: use fixed device number, consolidate /proc/apm into this file,
42 * Linux 1.3.85
43 * 1.1: support user-space standby and suspend, power off after system
44 * halted, Linux 1.3.98
45 * 1.2: When resetting RTC after resume, take care so that the time
46 * is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
47 * <jtoth@princeton.edu>); improve interaction between
48 * screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
49 * 1.2a:Simple change to stop mysterious bug reports with SMP also added
50 * levels to the printk calls. APM is not defined for SMP machines.
51 * The new replacement for it is, but Linux doesn't yet support this.
52 * Alan Cox Linux 2.1.55
53 * 1.3: Set up a valid data descriptor 0x40 for buggy BIOS's
54 * 1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by
55 * Dean Gaudet <dgaudet@arctic.org>.
56 * C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87
57 * 1.5: Fix segment register reloading (in case of bad segments saved
58 * across BIOS call).
59 * Stephen Rothwell
60 * 1.6: Cope with compiler/assembler differences.
61 * Only try to turn off the first display device.
62 * Fix OOPS at power off with no APM BIOS by Jan Echternach
63 * <echter@informatik.uni-rostock.de>
64 * Stephen Rothwell
65 * 1.7: Modify driver's cached copy of the disabled/disengaged flags
66 * to reflect current state of APM BIOS.
67 * Chris Rankin <rankinc@bellsouth.net>
68 * Reset interrupt 0 timer to 100Hz after suspend
69 * Chad Miller <cmiller@surfsouth.com>
70 * Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
71 * Richard Gooch <rgooch@atnf.csiro.au>
72 * Allow boot time disabling of APM
73 * Make boot messages far less verbose by default
74 * Make asm safer
75 * Stephen Rothwell
76 * 1.8: Add CONFIG_APM_RTC_IS_GMT
77 * Richard Gooch <rgooch@atnf.csiro.au>
78 * change APM_NOINTS to CONFIG_APM_ALLOW_INTS
79 * remove dependency on CONFIG_PROC_FS
80 * Stephen Rothwell
81 * 1.9: Fix small typo. <laslo@wodip.opole.pl>
82 * Try to cope with BIOS's that need to have all display
83 * devices blanked and not just the first one.
84 * Ross Paterson <ross@soi.city.ac.uk>
85 * Fix segment limit setting it has always been wrong as
86 * the segments needed to have byte granularity.
87 * Mark a few things __init.
88 * Add hack to allow power off of SMP systems by popular request.
89 * Use CONFIG_SMP instead of __SMP__
90 * Ignore BOUNCES for three seconds.
91 * Stephen Rothwell
92 * 1.10: Fix for Thinkpad return code.
93 * Merge 2.2 and 2.3 drivers.
94 * Remove APM dependencies in arch/i386/kernel/process.c
95 * Remove APM dependencies in drivers/char/sysrq.c
96 * Reset time across standby.
97 * Allow more initialisation on SMP.
98 * Remove CONFIG_APM_POWER_OFF and make it boot time
99 * configurable (default on).
100 * Make debug only a boot time parameter (remove APM_DEBUG).
101 * Try to blank all devices on any error.
102 * 1.11: Remove APM dependencies in drivers/char/console.c
103 * Check nr_running to detect if we are idle (from
104 * Borislav Deianov <borislav@lix.polytechnique.fr>)
105 * Fix for bioses that don't zero the top part of the
106 * entrypoint offset (Mario Sitta <sitta@al.unipmn.it>)
107 * (reported by Panos Katsaloulis <teras@writeme.com>).
108 * Real mode power off patch (Walter Hofmann
109 * <Walter.Hofmann@physik.stud.uni-erlangen.de>).
110 * 1.12: Remove CONFIG_SMP as the compiler will optimize
111 * the code away anyway (smp_num_cpus == 1 in UP)
112 * noted by Artur Skawina <skawina@geocities.com>.
113 * Make power off under SMP work again.
114 * Fix thinko with initial engaging of BIOS.
115 * Make sure power off only happens on CPU 0
116 * (Paul "Rusty" Russell <rusty@rustcorp.com.au>).
117 * Do error notification to user mode if BIOS calls fail.
118 * Move entrypoint offset fix to ...boot/setup.S
119 * where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>).
120 * Remove smp-power-off. SMP users must now specify
121 * "apm=power-off" on the kernel command line. Suggested
122 * by Jim Avera <jima@hal.com>, modified by Alan Cox
123 * <alan@lxorguk.ukuu.org.uk>.
124 * Register the /proc/apm entry even on SMP so that
125 * scripts that check for it before doing power off
126 * work (Jim Avera <jima@hal.com>).
127 * 1.13: Changes for new pm_ interfaces (Andy Henroid
128 * <andy_henroid@yahoo.com>).
129 * Modularize the code.
130 * Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS
131 * is now the way life works).
132 * Fix thinko in suspend() (wrong return).
133 * Notify drivers on critical suspend.
134 * Make kapmd absorb more idle time (Pavel Machek <pavel@ucw.cz>
135 * modified by sfr).
136 * Disable interrupts while we are suspended (Andy Henroid
137 * <andy_henroid@yahoo.com> fixed by sfr).
138 * Make power off work on SMP again (Tony Hoyle
139 * <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr.
140 * Remove CONFIG_APM_SUSPEND_BOUNCE. The bounce ignore
141 * interval is now configurable.
142 * 1.14: Make connection version persist across module unload/load.
143 * Enable and engage power management earlier.
144 * Disengage power management on module unload.
145 * Changed to use the sysrq-register hack for registering the
146 * power off function called by magic sysrq based upon discussions
147 * in irc://irc.openprojects.net/#kernelnewbies
148 * (Crutcher Dunnavant <crutcher+kernel@datastacks.com>).
149 * Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable.
150 * (Arjan van de Ven <arjanv@redhat.com>) modified by sfr.
151 * Work around byte swap bug in one of the Vaio's BIOS's
152 * (Marc Boucher <marc@mbsi.ca>).
153 * Exposed the disable flag to dmi so that we can handle known
154 * broken APM (Alan Cox <alan@lxorguk.ukuu.org.uk>).
155 * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
156 * calling it - instead idle. (Alan Cox <alan@lxorguk.ukuu.org.uk>)
157 * If an APM idle fails log it and idle sensibly
158 * 1.15: Don't queue events to clients who open the device O_WRONLY.
159 * Don't expect replies from clients who open the device O_RDONLY.
160 * (Idea from Thomas Hood)
161 * Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>)
162 * 1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.)
163 * Notify listeners of standby or suspend events before notifying
164 * drivers. Return EBUSY to ioctl() if suspend is rejected.
165 * (Russell King <rmk@arm.linux.org.uk> and Thomas Hood)
166 * Ignore first resume after we generate our own resume event
167 * after a suspend (Thomas Hood)
168 * Daemonize now gets rid of our controlling terminal (sfr).
169 * CONFIG_APM_CPU_IDLE now just affects the default value of
170 * idle_threshold (sfr).
171 * Change name of kernel apm daemon (as it no longer idles) (sfr).
172 * 1.16ac: Fix up SMP support somewhat. You can now force SMP on and we
173 * make _all_ APM calls on the CPU#0. Fix unsafe sign bug.
174 * TODO: determine if its "boot CPU" or "CPU0" we want to lock to.
175 *
176 * APM 1.1 Reference:
177 *
178 * Intel Corporation, Microsoft Corporation. Advanced Power Management
179 * (APM) BIOS Interface Specification, Revision 1.1, September 1993.
180 * Intel Order Number 241704-001. Microsoft Part Number 781-110-X01.
181 *
182 * [This document is available free from Intel by calling 800.628.8686 (fax
183 * 916.356.6100) or 800.548.4725; or from
184 * http://www.microsoft.com/whdc/archive/amp_12.mspx It is also
185 * available from Microsoft by calling 206.882.8080.]
186 *
187 * APM 1.2 Reference:
188 * Intel Corporation, Microsoft Corporation. Advanced Power Management
189 * (APM) BIOS Interface Specification, Revision 1.2, February 1996.
190 *
191 * [This document is available from Microsoft at:
192 * http://www.microsoft.com/whdc/archive/amp_12.mspx]
193 */
194
195#define pr_fmt(fmt) "apm: " fmt
196
197#include <linux/module.h>
198
199#include <linux/poll.h>
200#include <linux/types.h>
201#include <linux/stddef.h>
202#include <linux/timer.h>
203#include <linux/fcntl.h>
204#include <linux/slab.h>
205#include <linux/stat.h>
206#include <linux/proc_fs.h>
207#include <linux/seq_file.h>
208#include <linux/miscdevice.h>
209#include <linux/apm_bios.h>
210#include <linux/init.h>
211#include <linux/time.h>
212#include <linux/sched/signal.h>
213#include <linux/sched/cputime.h>
214#include <linux/pm.h>
215#include <linux/capability.h>
216#include <linux/device.h>
217#include <linux/kernel.h>
218#include <linux/freezer.h>
219#include <linux/smp.h>
220#include <linux/dmi.h>
221#include <linux/suspend.h>
222#include <linux/kthread.h>
223#include <linux/jiffies.h>
224#include <linux/acpi.h>
225#include <linux/syscore_ops.h>
226#include <linux/i8253.h>
227#include <linux/cpuidle.h>
228
229#include <linux/uaccess.h>
230#include <asm/desc.h>
231#include <asm/olpc.h>
232#include <asm/paravirt.h>
233#include <asm/reboot.h>
234#include <asm/nospec-branch.h>
235#include <asm/ibt.h>
236
237#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
238extern int (*console_blank_hook)(int);
239#endif
240
241/*
242 * The apm_bios device is one of the misc char devices.
243 * This is its minor number.
244 */
245#define APM_MINOR_DEV 134
246
247/*
248 * Various options can be changed at boot time as follows:
249 * (We allow underscores for compatibility with the modules code)
250 * apm=on/off enable/disable APM
251 * [no-]allow[-_]ints allow interrupts during BIOS calls
252 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
253 * [no-]realmode[-_]power[-_]off switch to real mode before
254 * powering off
255 * [no-]debug log some debugging messages
256 * [no-]power[-_]off power off on shutdown
257 * [no-]smp Use apm even on an SMP box
258 * bounce[-_]interval=<n> number of ticks to ignore suspend
259 * bounces
260 * idle[-_]threshold=<n> System idle percentage above which to
261 * make APM BIOS idle calls. Set it to
262 * 100 to disable.
263 * idle[-_]period=<n> Period (in 1/100s of a second) over
264 * which the idle percentage is
265 * calculated.
266 */
267
268/* KNOWN PROBLEM MACHINES:
269 *
270 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
271 * [Confirmed by TI representative]
272 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
273 * [Confirmed by BIOS disassembly]
274 * [This may work now ...]
275 * P: Toshiba 1950S: battery life information only gets updated after resume
276 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
277 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
278 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
279 * Neale Banks <neale@lowendale.com.au> December 2000
280 *
281 * Legend: U = unusable with APM patches
282 * P = partially usable with APM patches
283 */
284
285/*
286 * Define as 1 to make the driver always call the APM BIOS busy
287 * routine even if the clock was not reported as slowed by the
288 * idle routine. Otherwise, define as 0.
289 */
290#define ALWAYS_CALL_BUSY 1
291
292/*
293 * Define to make the APM BIOS calls zero all data segment registers (so
294 * that an incorrect BIOS implementation will cause a kernel panic if it
295 * tries to write to arbitrary memory).
296 */
297#define APM_ZERO_SEGS
298
299#include <asm/apm.h>
300
301/*
302 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
303 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
304 * David Chen <chen@ctpa04.mit.edu>
305 */
306#undef INIT_TIMER_AFTER_SUSPEND
307
308#ifdef INIT_TIMER_AFTER_SUSPEND
309#include <linux/timex.h>
310#include <asm/io.h>
311#include <linux/delay.h>
312#endif
313
314/*
315 * Need to poll the APM BIOS every second
316 */
317#define APM_CHECK_TIMEOUT (HZ)
318
319/*
320 * Ignore suspend events for this amount of time after a resume
321 */
322#define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
323
324/*
325 * Maximum number of events stored
326 */
327#define APM_MAX_EVENTS 20
328
329/*
330 * The per-file APM data
331 */
332struct apm_user {
333 int magic;
334 struct apm_user *next;
335 unsigned int suser: 1;
336 unsigned int writer: 1;
337 unsigned int reader: 1;
338 unsigned int suspend_wait: 1;
339 int suspend_result;
340 int suspends_pending;
341 int standbys_pending;
342 int suspends_read;
343 int standbys_read;
344 int event_head;
345 int event_tail;
346 apm_event_t events[APM_MAX_EVENTS];
347};
348
349/*
350 * The magic number in apm_user
351 */
352#define APM_BIOS_MAGIC 0x4101
353
354/*
355 * idle percentage above which bios idle calls are done
356 */
357#ifdef CONFIG_APM_CPU_IDLE
358#define DEFAULT_IDLE_THRESHOLD 95
359#else
360#define DEFAULT_IDLE_THRESHOLD 100
361#endif
362#define DEFAULT_IDLE_PERIOD (100 / 3)
363
364static int apm_cpu_idle(struct cpuidle_device *dev,
365 struct cpuidle_driver *drv, int index);
366
367static struct cpuidle_driver apm_idle_driver = {
368 .name = "apm_idle",
369 .owner = THIS_MODULE,
370 .states = {
371 { /* entry 0 is for polling */ },
372 { /* entry 1 is for APM idle */
373 .name = "APM",
374 .desc = "APM idle",
375 .exit_latency = 250, /* WAG */
376 .target_residency = 500, /* WAG */
377 .enter = &apm_cpu_idle
378 },
379 },
380 .state_count = 2,
381};
382
383static struct cpuidle_device apm_cpuidle_device;
384
385/*
386 * Local variables
387 */
388__visible struct {
389 unsigned long offset;
390 unsigned short segment;
391} apm_bios_entry;
392static int clock_slowed;
393static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
394static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
395static int suspends_pending;
396static int standbys_pending;
397static int ignore_sys_suspend;
398static int ignore_normal_resume;
399static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
400
401static bool debug __read_mostly;
402static bool smp __read_mostly;
403static int apm_disabled = -1;
404#ifdef CONFIG_SMP
405static bool power_off;
406#else
407static bool power_off = 1;
408#endif
409static bool realmode_power_off;
410#ifdef CONFIG_APM_ALLOW_INTS
411static bool allow_ints = 1;
412#else
413static bool allow_ints;
414#endif
415static bool broken_psr;
416
417static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
418static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
419static struct apm_user *user_list;
420static DEFINE_SPINLOCK(user_list_lock);
421static DEFINE_MUTEX(apm_mutex);
422
423/*
424 * Set up a segment that references the real mode segment 0x40
425 * that extends up to the end of page zero (that we have reserved).
426 * This is for buggy BIOS's that refer to (real mode) segment 0x40
427 * even though they are called in protected mode.
428 */
429static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
430 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
431
432static const char driver_version[] = "1.16ac"; /* no spaces */
433
434static struct task_struct *kapmd_task;
435
436/*
437 * APM event names taken from the APM 1.2 specification. These are
438 * the message codes that the BIOS uses to tell us about events
439 */
440static const char * const apm_event_name[] = {
441 "system standby",
442 "system suspend",
443 "normal resume",
444 "critical resume",
445 "low battery",
446 "power status change",
447 "update time",
448 "critical suspend",
449 "user standby",
450 "user suspend",
451 "system standby resume",
452 "capabilities change"
453};
454#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
455
456typedef struct lookup_t {
457 int key;
458 char *msg;
459} lookup_t;
460
461/*
462 * The BIOS returns a set of standard error codes in AX when the
463 * carry flag is set.
464 */
465
466static const lookup_t error_table[] = {
467/* N/A { APM_SUCCESS, "Operation succeeded" }, */
468 { APM_DISABLED, "Power management disabled" },
469 { APM_CONNECTED, "Real mode interface already connected" },
470 { APM_NOT_CONNECTED, "Interface not connected" },
471 { APM_16_CONNECTED, "16 bit interface already connected" },
472/* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
473 { APM_32_CONNECTED, "32 bit interface already connected" },
474 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
475 { APM_BAD_DEVICE, "Unrecognized device ID" },
476 { APM_BAD_PARAM, "Parameter out of range" },
477 { APM_NOT_ENGAGED, "Interface not engaged" },
478 { APM_BAD_FUNCTION, "Function not supported" },
479 { APM_RESUME_DISABLED, "Resume timer disabled" },
480 { APM_BAD_STATE, "Unable to enter requested state" },
481/* N/A { APM_NO_EVENTS, "No events pending" }, */
482 { APM_NO_ERROR, "BIOS did not set a return code" },
483 { APM_NOT_PRESENT, "No APM present" }
484};
485#define ERROR_COUNT ARRAY_SIZE(error_table)
486
487/**
488 * apm_error - display an APM error
489 * @str: information string
490 * @err: APM BIOS return code
491 *
492 * Write a meaningful log entry to the kernel log in the event of
493 * an APM error. Note that this also handles (negative) kernel errors.
494 */
495
496static void apm_error(char *str, int err)
497{
498 int i;
499
500 for (i = 0; i < ERROR_COUNT; i++)
501 if (error_table[i].key == err)
502 break;
503 if (i < ERROR_COUNT)
504 pr_notice("%s: %s\n", str, error_table[i].msg);
505 else if (err < 0)
506 pr_notice("%s: linux error code %i\n", str, err);
507 else
508 pr_notice("%s: unknown error code %#2.2x\n",
509 str, err);
510}
511
512/*
513 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
514 * apm_info.allow_ints, we are being really paranoid here! Not only
515 * are interrupts disabled, but all the segment registers (except SS)
516 * are saved and zeroed this means that if the BIOS tries to reference
517 * any data without explicitly loading the segment registers, the kernel
518 * will fault immediately rather than have some unforeseen circumstances
519 * for the rest of the kernel. And it will be very obvious! :-) Doing
520 * this depends on CS referring to the same physical memory as DS so that
521 * DS can be zeroed before the call. Unfortunately, we can't do anything
522 * about the stack segment/pointer. Also, we tell the compiler that
523 * everything could change.
524 *
525 * Also, we KNOW that for the non error case of apm_bios_call, there
526 * is no useful data returned in the low order 8 bits of eax.
527 */
528
529static inline unsigned long __apm_irq_save(void)
530{
531 unsigned long flags;
532 local_save_flags(flags);
533 if (apm_info.allow_ints) {
534 if (irqs_disabled_flags(flags))
535 local_irq_enable();
536 } else
537 local_irq_disable();
538
539 return flags;
540}
541
542#define apm_irq_save(flags) \
543 do { flags = __apm_irq_save(); } while (0)
544
545static inline void apm_irq_restore(unsigned long flags)
546{
547 if (irqs_disabled_flags(flags))
548 local_irq_disable();
549 else if (irqs_disabled())
550 local_irq_enable();
551}
552
553#ifdef APM_ZERO_SEGS
554# define APM_DECL_SEGS \
555 unsigned int saved_fs; unsigned int saved_gs;
556# define APM_DO_SAVE_SEGS \
557 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
558# define APM_DO_RESTORE_SEGS \
559 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
560#else
561# define APM_DECL_SEGS
562# define APM_DO_SAVE_SEGS
563# define APM_DO_RESTORE_SEGS
564#endif
565
566struct apm_bios_call {
567 u32 func;
568 /* In and out */
569 u32 ebx;
570 u32 ecx;
571 /* Out only */
572 u32 eax;
573 u32 edx;
574 u32 esi;
575
576 /* Error: -ENOMEM, or bits 8-15 of eax */
577 int err;
578};
579
580/**
581 * __apm_bios_call - Make an APM BIOS 32bit call
582 * @_call: pointer to struct apm_bios_call.
583 *
584 * Make an APM call using the 32bit protected mode interface. The
585 * caller is responsible for knowing if APM BIOS is configured and
586 * enabled. This call can disable interrupts for a long period of
587 * time on some laptops. The return value is in AH and the carry
588 * flag is loaded into AL. If there is an error, then the error
589 * code is returned in AH (bits 8-15 of eax) and this function
590 * returns non-zero.
591 *
592 * Note: this makes the call on the current CPU.
593 */
594static long __apm_bios_call(void *_call)
595{
596 APM_DECL_SEGS
597 unsigned long flags;
598 int cpu;
599 struct desc_struct save_desc_40;
600 struct desc_struct *gdt;
601 struct apm_bios_call *call = _call;
602 u64 ibt;
603
604 cpu = get_cpu();
605 BUG_ON(cpu != 0);
606 gdt = get_cpu_gdt_rw(cpu);
607 save_desc_40 = gdt[0x40 / 8];
608 gdt[0x40 / 8] = bad_bios_desc;
609
610 apm_irq_save(flags);
611 firmware_restrict_branch_speculation_start();
612 ibt = ibt_save();
613 APM_DO_SAVE_SEGS;
614 apm_bios_call_asm(call->func, call->ebx, call->ecx,
615 &call->eax, &call->ebx, &call->ecx, &call->edx,
616 &call->esi);
617 APM_DO_RESTORE_SEGS;
618 ibt_restore(ibt);
619 firmware_restrict_branch_speculation_end();
620 apm_irq_restore(flags);
621 gdt[0x40 / 8] = save_desc_40;
622 put_cpu();
623
624 return call->eax & 0xff;
625}
626
627/* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
628static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
629{
630 int ret;
631
632 /* Don't bother with work_on_cpu in the common case, so we don't
633 * have to worry about OOM or overhead. */
634 if (get_cpu() == 0) {
635 ret = fn(call);
636 put_cpu();
637 } else {
638 put_cpu();
639 ret = work_on_cpu(0, fn, call);
640 }
641
642 /* work_on_cpu can fail with -ENOMEM */
643 if (ret < 0)
644 call->err = ret;
645 else
646 call->err = (call->eax >> 8) & 0xff;
647
648 return ret;
649}
650
651/**
652 * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0)
653 * @call: the apm_bios_call registers.
654 *
655 * If there is an error, it is returned in @call.err.
656 */
657static int apm_bios_call(struct apm_bios_call *call)
658{
659 return on_cpu0(__apm_bios_call, call);
660}
661
662/**
663 * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
664 * @_call: pointer to struct apm_bios_call.
665 *
666 * Make a BIOS call that returns one value only, or just status.
667 * If there is an error, then the error code is returned in AH
668 * (bits 8-15 of eax) and this function returns non-zero (it can
669 * also return -ENOMEM). This is used for simpler BIOS operations.
670 * This call may hold interrupts off for a long time on some laptops.
671 *
672 * Note: this makes the call on the current CPU.
673 */
674static long __apm_bios_call_simple(void *_call)
675{
676 u8 error;
677 APM_DECL_SEGS
678 unsigned long flags;
679 int cpu;
680 struct desc_struct save_desc_40;
681 struct desc_struct *gdt;
682 struct apm_bios_call *call = _call;
683 u64 ibt;
684
685 cpu = get_cpu();
686 BUG_ON(cpu != 0);
687 gdt = get_cpu_gdt_rw(cpu);
688 save_desc_40 = gdt[0x40 / 8];
689 gdt[0x40 / 8] = bad_bios_desc;
690
691 apm_irq_save(flags);
692 firmware_restrict_branch_speculation_start();
693 ibt = ibt_save();
694 APM_DO_SAVE_SEGS;
695 error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
696 &call->eax);
697 APM_DO_RESTORE_SEGS;
698 ibt_restore(ibt);
699 firmware_restrict_branch_speculation_end();
700 apm_irq_restore(flags);
701 gdt[0x40 / 8] = save_desc_40;
702 put_cpu();
703 return error;
704}
705
706/**
707 * apm_bios_call_simple - make a simple APM BIOS 32bit call
708 * @func: APM function to invoke
709 * @ebx_in: EBX register value for BIOS call
710 * @ecx_in: ECX register value for BIOS call
711 * @eax: EAX register on return from the BIOS call
712 * @err: bits
713 *
714 * Make a BIOS call that returns one value only, or just status.
715 * If there is an error, then the error code is returned in @err
716 * and this function returns non-zero. This is used for simpler
717 * BIOS operations. This call may hold interrupts off for a long
718 * time on some laptops.
719 */
720static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
721 int *err)
722{
723 struct apm_bios_call call;
724 int ret;
725
726 call.func = func;
727 call.ebx = ebx_in;
728 call.ecx = ecx_in;
729
730 ret = on_cpu0(__apm_bios_call_simple, &call);
731 *eax = call.eax;
732 *err = call.err;
733 return ret;
734}
735
736/**
737 * apm_driver_version - APM driver version
738 * @val: loaded with the APM version on return
739 *
740 * Retrieve the APM version supported by the BIOS. This is only
741 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
742 * probably present.
743 *
744 * On entry val should point to a value indicating the APM driver
745 * version with the high byte being the major and the low byte the
746 * minor number both in BCD
747 *
748 * On return it will hold the BIOS revision supported in the
749 * same format.
750 */
751
752static int apm_driver_version(u_short *val)
753{
754 u32 eax;
755 int err;
756
757 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
758 return err;
759 *val = eax;
760 return APM_SUCCESS;
761}
762
763/**
764 * apm_get_event - get an APM event from the BIOS
765 * @event: pointer to the event
766 * @info: point to the event information
767 *
768 * The APM BIOS provides a polled information for event
769 * reporting. The BIOS expects to be polled at least every second
770 * when events are pending. When a message is found the caller should
771 * poll until no more messages are present. However, this causes
772 * problems on some laptops where a suspend event notification is
773 * not cleared until it is acknowledged.
774 *
775 * Additional information is returned in the info pointer, providing
776 * that APM 1.2 is in use. If no messages are pending the value 0x80
777 * is returned (No power management events pending).
778 */
779static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
780{
781 struct apm_bios_call call;
782
783 call.func = APM_FUNC_GET_EVENT;
784 call.ebx = call.ecx = 0;
785
786 if (apm_bios_call(&call))
787 return call.err;
788
789 *event = call.ebx;
790 if (apm_info.connection_version < 0x0102)
791 *info = ~0; /* indicate info not valid */
792 else
793 *info = call.ecx;
794 return APM_SUCCESS;
795}
796
797/**
798 * set_power_state - set the power management state
799 * @what: which items to transition
800 * @state: state to transition to
801 *
802 * Request an APM change of state for one or more system devices. The
803 * processor state must be transitioned last of all. what holds the
804 * class of device in the upper byte and the device number (0xFF for
805 * all) for the object to be transitioned.
806 *
807 * The state holds the state to transition to, which may in fact
808 * be an acceptance of a BIOS requested state change.
809 */
810
811static int set_power_state(u_short what, u_short state)
812{
813 u32 eax;
814 int err;
815
816 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
817 return err;
818 return APM_SUCCESS;
819}
820
821/**
822 * set_system_power_state - set system wide power state
823 * @state: which state to enter
824 *
825 * Transition the entire system into a new APM power state.
826 */
827
828static int set_system_power_state(u_short state)
829{
830 return set_power_state(APM_DEVICE_ALL, state);
831}
832
833/**
834 * apm_do_idle - perform power saving
835 *
836 * This function notifies the BIOS that the processor is (in the view
837 * of the OS) idle. It returns -1 in the event that the BIOS refuses
838 * to handle the idle request. On a success the function returns 1
839 * if the BIOS did clock slowing or 0 otherwise.
840 */
841
842static int apm_do_idle(void)
843{
844 u32 eax;
845 u8 ret = 0;
846 int idled = 0;
847 int err = 0;
848
849 if (!need_resched()) {
850 idled = 1;
851 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
852 }
853
854 if (!idled)
855 return 0;
856
857 if (ret) {
858 static unsigned long t;
859
860 /* This always fails on some SMP boards running UP kernels.
861 * Only report the failure the first 5 times.
862 */
863 if (++t < 5) {
864 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
865 t = jiffies;
866 }
867 return -1;
868 }
869 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
870 return clock_slowed;
871}
872
873/**
874 * apm_do_busy - inform the BIOS the CPU is busy
875 *
876 * Request that the BIOS brings the CPU back to full performance.
877 */
878
879static void apm_do_busy(void)
880{
881 u32 dummy;
882 int err;
883
884 if (clock_slowed || ALWAYS_CALL_BUSY) {
885 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
886 clock_slowed = 0;
887 }
888}
889
890/*
891 * If no process has really been interested in
892 * the CPU for some time, we want to call BIOS
893 * power management - we probably want
894 * to conserve power.
895 */
896#define IDLE_CALC_LIMIT (HZ * 100)
897#define IDLE_LEAKY_MAX 16
898
899/**
900 * apm_cpu_idle - cpu idling for APM capable Linux
901 *
902 * This is the idling function the kernel executes when APM is available. It
903 * tries to do BIOS powermanagement based on the average system idle time.
904 * Furthermore it calls the system default idle routine.
905 */
906
907static int apm_cpu_idle(struct cpuidle_device *dev,
908 struct cpuidle_driver *drv, int index)
909{
910 static int use_apm_idle; /* = 0 */
911 static unsigned int last_jiffies; /* = 0 */
912 static u64 last_stime; /* = 0 */
913 u64 stime, utime;
914
915 int apm_idle_done = 0;
916 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
917 unsigned int bucket;
918
919recalc:
920 task_cputime(current, &utime, &stime);
921 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
922 use_apm_idle = 0;
923 } else if (jiffies_since_last_check > idle_period) {
924 unsigned int idle_percentage;
925
926 idle_percentage = nsecs_to_jiffies(stime - last_stime);
927 idle_percentage *= 100;
928 idle_percentage /= jiffies_since_last_check;
929 use_apm_idle = (idle_percentage > idle_threshold);
930 if (apm_info.forbid_idle)
931 use_apm_idle = 0;
932 }
933
934 last_jiffies = jiffies;
935 last_stime = stime;
936
937 bucket = IDLE_LEAKY_MAX;
938
939 while (!need_resched()) {
940 if (use_apm_idle) {
941 unsigned int t;
942
943 t = jiffies;
944 switch (apm_do_idle()) {
945 case 0:
946 apm_idle_done = 1;
947 if (t != jiffies) {
948 if (bucket) {
949 bucket = IDLE_LEAKY_MAX;
950 continue;
951 }
952 } else if (bucket) {
953 bucket--;
954 continue;
955 }
956 break;
957 case 1:
958 apm_idle_done = 1;
959 break;
960 default: /* BIOS refused */
961 break;
962 }
963 }
964 default_idle();
965 local_irq_disable();
966 jiffies_since_last_check = jiffies - last_jiffies;
967 if (jiffies_since_last_check > idle_period)
968 goto recalc;
969 }
970
971 if (apm_idle_done)
972 apm_do_busy();
973
974 return index;
975}
976
977/**
978 * apm_power_off - ask the BIOS to power off
979 *
980 * Handle the power off sequence. This is the one piece of code we
981 * will execute even on SMP machines. In order to deal with BIOS
982 * bugs we support real mode APM BIOS power off calls. We also make
983 * the SMP call on CPU0 as some systems will only honour this call
984 * on their first cpu.
985 */
986
987static void apm_power_off(void)
988{
989 /* Some bioses don't like being called from CPU != 0 */
990 if (apm_info.realmode_power_off) {
991 set_cpus_allowed_ptr(current, cpumask_of(0));
992 machine_real_restart(MRR_APM);
993 } else {
994 (void)set_system_power_state(APM_STATE_OFF);
995 }
996}
997
998#ifdef CONFIG_APM_DO_ENABLE
999
1000/**
1001 * apm_enable_power_management - enable BIOS APM power management
1002 * @enable: enable yes/no
1003 *
1004 * Enable or disable the APM BIOS power services.
1005 */
1006
1007static int apm_enable_power_management(int enable)
1008{
1009 u32 eax;
1010 int err;
1011
1012 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1013 return APM_NOT_ENGAGED;
1014 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1015 enable, &eax, &err))
1016 return err;
1017 if (enable)
1018 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1019 else
1020 apm_info.bios.flags |= APM_BIOS_DISABLED;
1021 return APM_SUCCESS;
1022}
1023#endif
1024
1025/**
1026 * apm_get_power_status - get current power state
1027 * @status: returned status
1028 * @bat: battery info
1029 * @life: estimated life
1030 *
1031 * Obtain the current power status from the APM BIOS. We return a
1032 * status which gives the rough battery status, and current power
1033 * source. The bat value returned give an estimate as a percentage
1034 * of life and a status value for the battery. The estimated life
1035 * if reported is a lifetime in seconds/minutes at current power
1036 * consumption.
1037 */
1038
1039static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1040{
1041 struct apm_bios_call call;
1042
1043 call.func = APM_FUNC_GET_STATUS;
1044 call.ebx = APM_DEVICE_ALL;
1045 call.ecx = 0;
1046
1047 if (apm_info.get_power_status_broken)
1048 return APM_32_UNSUPPORTED;
1049 if (apm_bios_call(&call)) {
1050 if (!call.err)
1051 return APM_NO_ERROR;
1052 return call.err;
1053 }
1054 *status = call.ebx;
1055 *bat = call.ecx;
1056 if (apm_info.get_power_status_swabinminutes) {
1057 *life = swab16((u16)call.edx);
1058 *life |= 0x8000;
1059 } else
1060 *life = call.edx;
1061 return APM_SUCCESS;
1062}
1063
1064#if 0
1065static int apm_get_battery_status(u_short which, u_short *status,
1066 u_short *bat, u_short *life, u_short *nbat)
1067{
1068 u32 eax;
1069 u32 ebx;
1070 u32 ecx;
1071 u32 edx;
1072 u32 esi;
1073
1074 if (apm_info.connection_version < 0x0102) {
1075 /* pretend we only have one battery. */
1076 if (which != 1)
1077 return APM_BAD_DEVICE;
1078 *nbat = 1;
1079 return apm_get_power_status(status, bat, life);
1080 }
1081
1082 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1083 &ebx, &ecx, &edx, &esi))
1084 return (eax >> 8) & 0xff;
1085 *status = ebx;
1086 *bat = ecx;
1087 *life = edx;
1088 *nbat = esi;
1089 return APM_SUCCESS;
1090}
1091#endif
1092
1093/**
1094 * apm_engage_power_management - enable PM on a device
1095 * @device: identity of device
1096 * @enable: on/off
1097 *
1098 * Activate or deactivate power management on either a specific device
1099 * or the entire system (%APM_DEVICE_ALL).
1100 */
1101
1102static int apm_engage_power_management(u_short device, int enable)
1103{
1104 u32 eax;
1105 int err;
1106
1107 if ((enable == 0) && (device == APM_DEVICE_ALL)
1108 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1109 return APM_DISABLED;
1110 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1111 &eax, &err))
1112 return err;
1113 if (device == APM_DEVICE_ALL) {
1114 if (enable)
1115 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1116 else
1117 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1118 }
1119 return APM_SUCCESS;
1120}
1121
1122#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1123
1124/**
1125 * apm_console_blank - blank the display
1126 * @blank: on/off
1127 *
1128 * Attempt to blank the console, firstly by blanking just video device
1129 * zero, and if that fails (some BIOSes don't support it) then it blanks
1130 * all video devices. Typically the BIOS will do laptop backlight and
1131 * monitor powerdown for us.
1132 */
1133
1134static int apm_console_blank(int blank)
1135{
1136 int error = APM_NOT_ENGAGED; /* silence gcc */
1137 int i;
1138 u_short state;
1139 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1140
1141 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1142
1143 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1144 error = set_power_state(dev[i], state);
1145
1146 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1147 return 1;
1148
1149 if (error == APM_NOT_ENGAGED)
1150 break;
1151 }
1152
1153 if (error == APM_NOT_ENGAGED) {
1154 static int tried;
1155 int eng_error;
1156 if (tried++ == 0) {
1157 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1158 if (eng_error) {
1159 apm_error("set display", error);
1160 apm_error("engage interface", eng_error);
1161 return 0;
1162 } else
1163 return apm_console_blank(blank);
1164 }
1165 }
1166 apm_error("set display", error);
1167 return 0;
1168}
1169#endif
1170
1171static int queue_empty(struct apm_user *as)
1172{
1173 return as->event_head == as->event_tail;
1174}
1175
1176static apm_event_t get_queued_event(struct apm_user *as)
1177{
1178 if (++as->event_tail >= APM_MAX_EVENTS)
1179 as->event_tail = 0;
1180 return as->events[as->event_tail];
1181}
1182
1183static void queue_event(apm_event_t event, struct apm_user *sender)
1184{
1185 struct apm_user *as;
1186
1187 spin_lock(&user_list_lock);
1188 if (user_list == NULL)
1189 goto out;
1190 for (as = user_list; as != NULL; as = as->next) {
1191 if ((as == sender) || (!as->reader))
1192 continue;
1193 if (++as->event_head >= APM_MAX_EVENTS)
1194 as->event_head = 0;
1195
1196 if (as->event_head == as->event_tail) {
1197 static int notified;
1198
1199 if (notified++ == 0)
1200 pr_err("an event queue overflowed\n");
1201 if (++as->event_tail >= APM_MAX_EVENTS)
1202 as->event_tail = 0;
1203 }
1204 as->events[as->event_head] = event;
1205 if (!as->suser || !as->writer)
1206 continue;
1207 switch (event) {
1208 case APM_SYS_SUSPEND:
1209 case APM_USER_SUSPEND:
1210 as->suspends_pending++;
1211 suspends_pending++;
1212 break;
1213
1214 case APM_SYS_STANDBY:
1215 case APM_USER_STANDBY:
1216 as->standbys_pending++;
1217 standbys_pending++;
1218 break;
1219 }
1220 }
1221 wake_up_interruptible(&apm_waitqueue);
1222out:
1223 spin_unlock(&user_list_lock);
1224}
1225
1226static void reinit_timer(void)
1227{
1228#ifdef INIT_TIMER_AFTER_SUSPEND
1229 unsigned long flags;
1230
1231 raw_spin_lock_irqsave(&i8253_lock, flags);
1232 /* set the clock to HZ */
1233 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1234 udelay(10);
1235 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1236 udelay(10);
1237 outb_p(LATCH >> 8, PIT_CH0); /* MSB */
1238 udelay(10);
1239 raw_spin_unlock_irqrestore(&i8253_lock, flags);
1240#endif
1241}
1242
1243static int suspend(int vetoable)
1244{
1245 int err;
1246 struct apm_user *as;
1247
1248 dpm_suspend_start(PMSG_SUSPEND);
1249 dpm_suspend_end(PMSG_SUSPEND);
1250
1251 local_irq_disable();
1252 syscore_suspend();
1253
1254 local_irq_enable();
1255
1256 save_processor_state();
1257 err = set_system_power_state(APM_STATE_SUSPEND);
1258 ignore_normal_resume = 1;
1259 restore_processor_state();
1260
1261 local_irq_disable();
1262 reinit_timer();
1263
1264 if (err == APM_NO_ERROR)
1265 err = APM_SUCCESS;
1266 if (err != APM_SUCCESS)
1267 apm_error("suspend", err);
1268 err = (err == APM_SUCCESS) ? 0 : -EIO;
1269
1270 syscore_resume();
1271 local_irq_enable();
1272
1273 dpm_resume_start(PMSG_RESUME);
1274 dpm_resume_end(PMSG_RESUME);
1275
1276 queue_event(APM_NORMAL_RESUME, NULL);
1277 spin_lock(&user_list_lock);
1278 for (as = user_list; as != NULL; as = as->next) {
1279 as->suspend_wait = 0;
1280 as->suspend_result = err;
1281 }
1282 spin_unlock(&user_list_lock);
1283 wake_up_interruptible(&apm_suspend_waitqueue);
1284 return err;
1285}
1286
1287static void standby(void)
1288{
1289 int err;
1290
1291 dpm_suspend_end(PMSG_SUSPEND);
1292
1293 local_irq_disable();
1294 syscore_suspend();
1295 local_irq_enable();
1296
1297 err = set_system_power_state(APM_STATE_STANDBY);
1298 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1299 apm_error("standby", err);
1300
1301 local_irq_disable();
1302 syscore_resume();
1303 local_irq_enable();
1304
1305 dpm_resume_start(PMSG_RESUME);
1306}
1307
1308static apm_event_t get_event(void)
1309{
1310 int error;
1311 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1312 apm_eventinfo_t info;
1313
1314 static int notified;
1315
1316 /* we don't use the eventinfo */
1317 error = apm_get_event(&event, &info);
1318 if (error == APM_SUCCESS)
1319 return event;
1320
1321 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1322 apm_error("get_event", error);
1323
1324 return 0;
1325}
1326
1327static void check_events(void)
1328{
1329 apm_event_t event;
1330 static unsigned long last_resume;
1331 static int ignore_bounce;
1332
1333 while ((event = get_event()) != 0) {
1334 if (debug) {
1335 if (event <= NR_APM_EVENT_NAME)
1336 printk(KERN_DEBUG "apm: received %s notify\n",
1337 apm_event_name[event - 1]);
1338 else
1339 printk(KERN_DEBUG "apm: received unknown "
1340 "event 0x%02x\n", event);
1341 }
1342 if (ignore_bounce
1343 && (time_after(jiffies, last_resume + bounce_interval)))
1344 ignore_bounce = 0;
1345
1346 switch (event) {
1347 case APM_SYS_STANDBY:
1348 case APM_USER_STANDBY:
1349 queue_event(event, NULL);
1350 if (standbys_pending <= 0)
1351 standby();
1352 break;
1353
1354 case APM_USER_SUSPEND:
1355#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1356 if (apm_info.connection_version > 0x100)
1357 set_system_power_state(APM_STATE_REJECT);
1358 break;
1359#endif
1360 case APM_SYS_SUSPEND:
1361 if (ignore_bounce) {
1362 if (apm_info.connection_version > 0x100)
1363 set_system_power_state(APM_STATE_REJECT);
1364 break;
1365 }
1366 /*
1367 * If we are already processing a SUSPEND,
1368 * then further SUSPEND events from the BIOS
1369 * will be ignored. We also return here to
1370 * cope with the fact that the Thinkpads keep
1371 * sending a SUSPEND event until something else
1372 * happens!
1373 */
1374 if (ignore_sys_suspend)
1375 return;
1376 ignore_sys_suspend = 1;
1377 queue_event(event, NULL);
1378 if (suspends_pending <= 0)
1379 (void) suspend(1);
1380 break;
1381
1382 case APM_NORMAL_RESUME:
1383 case APM_CRITICAL_RESUME:
1384 case APM_STANDBY_RESUME:
1385 ignore_sys_suspend = 0;
1386 last_resume = jiffies;
1387 ignore_bounce = 1;
1388 if ((event != APM_NORMAL_RESUME)
1389 || (ignore_normal_resume == 0)) {
1390 dpm_resume_end(PMSG_RESUME);
1391 queue_event(event, NULL);
1392 }
1393 ignore_normal_resume = 0;
1394 break;
1395
1396 case APM_CAPABILITY_CHANGE:
1397 case APM_LOW_BATTERY:
1398 case APM_POWER_STATUS_CHANGE:
1399 queue_event(event, NULL);
1400 /* If needed, notify drivers here */
1401 break;
1402
1403 case APM_UPDATE_TIME:
1404 break;
1405
1406 case APM_CRITICAL_SUSPEND:
1407 /*
1408 * We are not allowed to reject a critical suspend.
1409 */
1410 (void)suspend(0);
1411 break;
1412 }
1413 }
1414}
1415
1416static void apm_event_handler(void)
1417{
1418 static int pending_count = 4;
1419 int err;
1420
1421 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1422 if ((apm_info.connection_version > 0x100) &&
1423 (pending_count-- <= 0)) {
1424 pending_count = 4;
1425 if (debug)
1426 printk(KERN_DEBUG "apm: setting state busy\n");
1427 err = set_system_power_state(APM_STATE_BUSY);
1428 if (err)
1429 apm_error("busy", err);
1430 }
1431 } else
1432 pending_count = 4;
1433 check_events();
1434}
1435
1436/*
1437 * This is the APM thread main loop.
1438 */
1439
1440static void apm_mainloop(void)
1441{
1442 DECLARE_WAITQUEUE(wait, current);
1443
1444 add_wait_queue(&apm_waitqueue, &wait);
1445 set_current_state(TASK_INTERRUPTIBLE);
1446 for (;;) {
1447 schedule_timeout(APM_CHECK_TIMEOUT);
1448 if (kthread_should_stop())
1449 break;
1450 /*
1451 * Ok, check all events, check for idle (and mark us sleeping
1452 * so as not to count towards the load average)..
1453 */
1454 set_current_state(TASK_INTERRUPTIBLE);
1455 apm_event_handler();
1456 }
1457 remove_wait_queue(&apm_waitqueue, &wait);
1458}
1459
1460static int check_apm_user(struct apm_user *as, const char *func)
1461{
1462 if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1463 pr_err("%s passed bad filp\n", func);
1464 return 1;
1465 }
1466 return 0;
1467}
1468
1469static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1470{
1471 struct apm_user *as;
1472 int i;
1473 apm_event_t event;
1474
1475 as = fp->private_data;
1476 if (check_apm_user(as, "read"))
1477 return -EIO;
1478 if ((int)count < sizeof(apm_event_t))
1479 return -EINVAL;
1480 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1481 return -EAGAIN;
1482 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1483 i = count;
1484 while ((i >= sizeof(event)) && !queue_empty(as)) {
1485 event = get_queued_event(as);
1486 if (copy_to_user(buf, &event, sizeof(event))) {
1487 if (i < count)
1488 break;
1489 return -EFAULT;
1490 }
1491 switch (event) {
1492 case APM_SYS_SUSPEND:
1493 case APM_USER_SUSPEND:
1494 as->suspends_read++;
1495 break;
1496
1497 case APM_SYS_STANDBY:
1498 case APM_USER_STANDBY:
1499 as->standbys_read++;
1500 break;
1501 }
1502 buf += sizeof(event);
1503 i -= sizeof(event);
1504 }
1505 if (i < count)
1506 return count - i;
1507 if (signal_pending(current))
1508 return -ERESTARTSYS;
1509 return 0;
1510}
1511
1512static __poll_t do_poll(struct file *fp, poll_table *wait)
1513{
1514 struct apm_user *as;
1515
1516 as = fp->private_data;
1517 if (check_apm_user(as, "poll"))
1518 return 0;
1519 poll_wait(fp, &apm_waitqueue, wait);
1520 if (!queue_empty(as))
1521 return EPOLLIN | EPOLLRDNORM;
1522 return 0;
1523}
1524
1525static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1526{
1527 struct apm_user *as;
1528 int ret;
1529
1530 as = filp->private_data;
1531 if (check_apm_user(as, "ioctl"))
1532 return -EIO;
1533 if (!as->suser || !as->writer)
1534 return -EPERM;
1535 switch (cmd) {
1536 case APM_IOC_STANDBY:
1537 mutex_lock(&apm_mutex);
1538 if (as->standbys_read > 0) {
1539 as->standbys_read--;
1540 as->standbys_pending--;
1541 standbys_pending--;
1542 } else
1543 queue_event(APM_USER_STANDBY, as);
1544 if (standbys_pending <= 0)
1545 standby();
1546 mutex_unlock(&apm_mutex);
1547 break;
1548 case APM_IOC_SUSPEND:
1549 mutex_lock(&apm_mutex);
1550 if (as->suspends_read > 0) {
1551 as->suspends_read--;
1552 as->suspends_pending--;
1553 suspends_pending--;
1554 } else
1555 queue_event(APM_USER_SUSPEND, as);
1556 if (suspends_pending <= 0) {
1557 ret = suspend(1);
1558 mutex_unlock(&apm_mutex);
1559 } else {
1560 as->suspend_wait = 1;
1561 mutex_unlock(&apm_mutex);
1562 wait_event_interruptible(apm_suspend_waitqueue,
1563 as->suspend_wait == 0);
1564 ret = as->suspend_result;
1565 }
1566 return ret;
1567 default:
1568 return -ENOTTY;
1569 }
1570 return 0;
1571}
1572
1573static int do_release(struct inode *inode, struct file *filp)
1574{
1575 struct apm_user *as;
1576
1577 as = filp->private_data;
1578 if (check_apm_user(as, "release"))
1579 return 0;
1580 filp->private_data = NULL;
1581 if (as->standbys_pending > 0) {
1582 standbys_pending -= as->standbys_pending;
1583 if (standbys_pending <= 0)
1584 standby();
1585 }
1586 if (as->suspends_pending > 0) {
1587 suspends_pending -= as->suspends_pending;
1588 if (suspends_pending <= 0)
1589 (void) suspend(1);
1590 }
1591 spin_lock(&user_list_lock);
1592 if (user_list == as)
1593 user_list = as->next;
1594 else {
1595 struct apm_user *as1;
1596
1597 for (as1 = user_list;
1598 (as1 != NULL) && (as1->next != as);
1599 as1 = as1->next)
1600 ;
1601 if (as1 == NULL)
1602 pr_err("filp not in user list\n");
1603 else
1604 as1->next = as->next;
1605 }
1606 spin_unlock(&user_list_lock);
1607 kfree(as);
1608 return 0;
1609}
1610
1611static int do_open(struct inode *inode, struct file *filp)
1612{
1613 struct apm_user *as;
1614
1615 as = kmalloc(sizeof(*as), GFP_KERNEL);
1616 if (as == NULL)
1617 return -ENOMEM;
1618
1619 as->magic = APM_BIOS_MAGIC;
1620 as->event_tail = as->event_head = 0;
1621 as->suspends_pending = as->standbys_pending = 0;
1622 as->suspends_read = as->standbys_read = 0;
1623 /*
1624 * XXX - this is a tiny bit broken, when we consider BSD
1625 * process accounting. If the device is opened by root, we
1626 * instantly flag that we used superuser privs. Who knows,
1627 * we might close the device immediately without doing a
1628 * privileged operation -- cevans
1629 */
1630 as->suser = capable(CAP_SYS_ADMIN);
1631 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1632 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1633 spin_lock(&user_list_lock);
1634 as->next = user_list;
1635 user_list = as;
1636 spin_unlock(&user_list_lock);
1637 filp->private_data = as;
1638 return 0;
1639}
1640
1641#ifdef CONFIG_PROC_FS
1642static int proc_apm_show(struct seq_file *m, void *v)
1643{
1644 unsigned short bx;
1645 unsigned short cx;
1646 unsigned short dx;
1647 int error;
1648 unsigned short ac_line_status = 0xff;
1649 unsigned short battery_status = 0xff;
1650 unsigned short battery_flag = 0xff;
1651 int percentage = -1;
1652 int time_units = -1;
1653 char *units = "?";
1654
1655 if ((num_online_cpus() == 1) &&
1656 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1657 ac_line_status = (bx >> 8) & 0xff;
1658 battery_status = bx & 0xff;
1659 if ((cx & 0xff) != 0xff)
1660 percentage = cx & 0xff;
1661
1662 if (apm_info.connection_version > 0x100) {
1663 battery_flag = (cx >> 8) & 0xff;
1664 if (dx != 0xffff) {
1665 units = (dx & 0x8000) ? "min" : "sec";
1666 time_units = dx & 0x7fff;
1667 }
1668 }
1669 }
1670 /* Arguments, with symbols from linux/apm_bios.h. Information is
1671 from the Get Power Status (0x0a) call unless otherwise noted.
1672
1673 0) Linux driver version (this will change if format changes)
1674 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1675 2) APM flags from APM Installation Check (0x00):
1676 bit 0: APM_16_BIT_SUPPORT
1677 bit 1: APM_32_BIT_SUPPORT
1678 bit 2: APM_IDLE_SLOWS_CLOCK
1679 bit 3: APM_BIOS_DISABLED
1680 bit 4: APM_BIOS_DISENGAGED
1681 3) AC line status
1682 0x00: Off-line
1683 0x01: On-line
1684 0x02: On backup power (BIOS >= 1.1 only)
1685 0xff: Unknown
1686 4) Battery status
1687 0x00: High
1688 0x01: Low
1689 0x02: Critical
1690 0x03: Charging
1691 0x04: Selected battery not present (BIOS >= 1.2 only)
1692 0xff: Unknown
1693 5) Battery flag
1694 bit 0: High
1695 bit 1: Low
1696 bit 2: Critical
1697 bit 3: Charging
1698 bit 7: No system battery
1699 0xff: Unknown
1700 6) Remaining battery life (percentage of charge):
1701 0-100: valid
1702 -1: Unknown
1703 7) Remaining battery life (time units):
1704 Number of remaining minutes or seconds
1705 -1: Unknown
1706 8) min = minutes; sec = seconds */
1707
1708 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1709 driver_version,
1710 (apm_info.bios.version >> 8) & 0xff,
1711 apm_info.bios.version & 0xff,
1712 apm_info.bios.flags,
1713 ac_line_status,
1714 battery_status,
1715 battery_flag,
1716 percentage,
1717 time_units,
1718 units);
1719 return 0;
1720}
1721#endif
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 const struct dmi_system_id apm_dmi_table[] __initconst = {
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 || 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 pr_notice("disabled on user request.\n");
2317 return -ENODEV;
2318 }
2319 if ((num_online_cpus() > 1) && !power_off && !smp) {
2320 pr_notice("disabled - APM is not SMP safe.\n");
2321 apm_info.disabled = 1;
2322 return -ENODEV;
2323 }
2324 if (!acpi_disabled) {
2325 pr_notice("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_rw(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_single("apm", 0, NULL, proc_apm_show);
2356
2357 kapmd_task = kthread_create(apm, NULL, "kapmd");
2358 if (IS_ERR(kapmd_task)) {
2359 pr_err("disabled - Unable to start kernel thread\n");
2360 err = PTR_ERR(kapmd_task);
2361 kapmd_task = NULL;
2362 remove_proc_entry("apm", NULL);
2363 return err;
2364 }
2365 wake_up_process(kapmd_task);
2366
2367 if (num_online_cpus() > 1 && !smp) {
2368 printk(KERN_NOTICE
2369 "apm: disabled - APM is not SMP safe (power off active).\n");
2370 return 0;
2371 }
2372
2373 /*
2374 * Note we don't actually care if the misc_device cannot be registered.
2375 * this driver can do its job without it, even if userspace can't
2376 * control it. just log the error
2377 */
2378 if (misc_register(&apm_device))
2379 printk(KERN_WARNING "apm: Could not register misc device.\n");
2380
2381 if (HZ != 100)
2382 idle_period = (idle_period * HZ) / 100;
2383 if (idle_threshold < 100) {
2384 cpuidle_poll_state_init(&apm_idle_driver);
2385 if (!cpuidle_register_driver(&apm_idle_driver))
2386 if (cpuidle_register_device(&apm_cpuidle_device))
2387 cpuidle_unregister_driver(&apm_idle_driver);
2388 }
2389
2390 return 0;
2391}
2392
2393static void __exit apm_exit(void)
2394{
2395 int error;
2396
2397 cpuidle_unregister_device(&apm_cpuidle_device);
2398 cpuidle_unregister_driver(&apm_idle_driver);
2399
2400 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2401 && (apm_info.connection_version > 0x0100)) {
2402 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2403 if (error)
2404 apm_error("disengage power management", error);
2405 }
2406 misc_deregister(&apm_device);
2407 remove_proc_entry("apm", NULL);
2408 if (power_off)
2409 pm_power_off = NULL;
2410 if (kapmd_task) {
2411 kthread_stop(kapmd_task);
2412 kapmd_task = NULL;
2413 }
2414}
2415
2416module_init(apm_init);
2417module_exit(apm_exit);
2418
2419MODULE_AUTHOR("Stephen Rothwell");
2420MODULE_DESCRIPTION("Advanced Power Management");
2421MODULE_LICENSE("GPL");
2422module_param(debug, bool, 0644);
2423MODULE_PARM_DESC(debug, "Enable debug mode");
2424module_param(power_off, bool, 0444);
2425MODULE_PARM_DESC(power_off, "Enable power off");
2426module_param(bounce_interval, int, 0444);
2427MODULE_PARM_DESC(bounce_interval,
2428 "Set the number of ticks to ignore suspend bounces");
2429module_param(allow_ints, bool, 0444);
2430MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2431module_param(broken_psr, bool, 0444);
2432MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2433module_param(realmode_power_off, bool, 0444);
2434MODULE_PARM_DESC(realmode_power_off,
2435 "Switch to real mode before powering off");
2436module_param(idle_threshold, int, 0444);
2437MODULE_PARM_DESC(idle_threshold,
2438 "System idle percentage above which to make APM BIOS idle calls");
2439module_param(idle_period, int, 0444);
2440MODULE_PARM_DESC(idle_period,
2441 "Period (in sec/100) over which to calculate the idle percentage");
2442module_param(smp, bool, 0444);
2443MODULE_PARM_DESC(smp,
2444 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2445MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);