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[mirror_ubuntu-jammy-kernel.git] / arch / x86 / kernel / apm_32.c
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 complier/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@suse.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 via anonymous ftp from
193 * ftp://ftp.intel.com/pub/IAL/software_specs/apmv11.doc. 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/smp_lock.h>
208 #include <linux/types.h>
209 #include <linux/stddef.h>
210 #include <linux/timer.h>
211 #include <linux/fcntl.h>
212 #include <linux/slab.h>
213 #include <linux/stat.h>
214 #include <linux/proc_fs.h>
215 #include <linux/seq_file.h>
216 #include <linux/miscdevice.h>
217 #include <linux/apm_bios.h>
218 #include <linux/init.h>
219 #include <linux/time.h>
220 #include <linux/sched.h>
221 #include <linux/pm.h>
222 #include <linux/capability.h>
223 #include <linux/device.h>
224 #include <linux/kernel.h>
225 #include <linux/freezer.h>
226 #include <linux/smp.h>
227 #include <linux/dmi.h>
228 #include <linux/suspend.h>
229 #include <linux/kthread.h>
230 #include <linux/jiffies.h>
231
232 #include <asm/system.h>
233 #include <asm/uaccess.h>
234 #include <asm/desc.h>
235 #include <asm/i8253.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)
241 extern 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 * See Documentation/Config.help for the configuration options.
252 *
253 * Various options can be changed at boot time as follows:
254 * (We allow underscores for compatibility with the modules code)
255 * apm=on/off enable/disable APM
256 * [no-]allow[-_]ints allow interrupts during BIOS calls
257 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
258 * [no-]realmode[-_]power[-_]off switch to real mode before
259 * powering off
260 * [no-]debug log some debugging messages
261 * [no-]power[-_]off power off on shutdown
262 * [no-]smp Use apm even on an SMP box
263 * bounce[-_]interval=<n> number of ticks to ignore suspend
264 * bounces
265 * idle[-_]threshold=<n> System idle percentage above which to
266 * make APM BIOS idle calls. Set it to
267 * 100 to disable.
268 * idle[-_]period=<n> Period (in 1/100s of a second) over
269 * which the idle percentage is
270 * calculated.
271 */
272
273 /* KNOWN PROBLEM MACHINES:
274 *
275 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
276 * [Confirmed by TI representative]
277 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
278 * [Confirmed by BIOS disassembly]
279 * [This may work now ...]
280 * P: Toshiba 1950S: battery life information only gets updated after resume
281 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
282 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
283 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
284 * Neale Banks <neale@lowendale.com.au> December 2000
285 *
286 * Legend: U = unusable with APM patches
287 * P = partially usable with APM patches
288 */
289
290 /*
291 * Define as 1 to make the driver always call the APM BIOS busy
292 * routine even if the clock was not reported as slowed by the
293 * idle routine. Otherwise, define as 0.
294 */
295 #define ALWAYS_CALL_BUSY 1
296
297 /*
298 * Define to make the APM BIOS calls zero all data segment registers (so
299 * that an incorrect BIOS implementation will cause a kernel panic if it
300 * tries to write to arbitrary memory).
301 */
302 #define APM_ZERO_SEGS
303
304 #include "apm.h"
305
306 /*
307 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
308 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
309 * David Chen <chen@ctpa04.mit.edu>
310 */
311 #undef INIT_TIMER_AFTER_SUSPEND
312
313 #ifdef INIT_TIMER_AFTER_SUSPEND
314 #include <linux/timex.h>
315 #include <asm/io.h>
316 #include <linux/delay.h>
317 #endif
318
319 /*
320 * Need to poll the APM BIOS every second
321 */
322 #define APM_CHECK_TIMEOUT (HZ)
323
324 /*
325 * Ignore suspend events for this amount of time after a resume
326 */
327 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
328
329 /*
330 * Maximum number of events stored
331 */
332 #define APM_MAX_EVENTS 20
333
334 /*
335 * The per-file APM data
336 */
337 struct apm_user {
338 int magic;
339 struct apm_user *next;
340 unsigned int suser: 1;
341 unsigned int writer: 1;
342 unsigned int reader: 1;
343 unsigned int suspend_wait: 1;
344 int suspend_result;
345 int suspends_pending;
346 int standbys_pending;
347 int suspends_read;
348 int standbys_read;
349 int event_head;
350 int event_tail;
351 apm_event_t events[APM_MAX_EVENTS];
352 };
353
354 /*
355 * The magic number in apm_user
356 */
357 #define APM_BIOS_MAGIC 0x4101
358
359 /*
360 * idle percentage above which bios idle calls are done
361 */
362 #ifdef CONFIG_APM_CPU_IDLE
363 #define DEFAULT_IDLE_THRESHOLD 95
364 #else
365 #define DEFAULT_IDLE_THRESHOLD 100
366 #endif
367 #define DEFAULT_IDLE_PERIOD (100 / 3)
368
369 /*
370 * Local variables
371 */
372 static struct {
373 unsigned long offset;
374 unsigned short segment;
375 } apm_bios_entry;
376 static int clock_slowed;
377 static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
378 static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
379 static int set_pm_idle;
380 static int suspends_pending;
381 static int standbys_pending;
382 static int ignore_sys_suspend;
383 static int ignore_normal_resume;
384 static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
385
386 static int debug __read_mostly;
387 static int smp __read_mostly;
388 static int apm_disabled = -1;
389 #ifdef CONFIG_SMP
390 static int power_off;
391 #else
392 static int power_off = 1;
393 #endif
394 static int realmode_power_off;
395 #ifdef CONFIG_APM_ALLOW_INTS
396 static int allow_ints = 1;
397 #else
398 static int allow_ints;
399 #endif
400 static int broken_psr;
401
402 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
403 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
404 static struct apm_user *user_list;
405 static DEFINE_SPINLOCK(user_list_lock);
406 static const struct desc_struct bad_bios_desc = { { { 0, 0x00409200 } } };
407
408 static const char driver_version[] = "1.16ac"; /* no spaces */
409
410 static struct task_struct *kapmd_task;
411
412 /*
413 * APM event names taken from the APM 1.2 specification. These are
414 * the message codes that the BIOS uses to tell us about events
415 */
416 static const char * const apm_event_name[] = {
417 "system standby",
418 "system suspend",
419 "normal resume",
420 "critical resume",
421 "low battery",
422 "power status change",
423 "update time",
424 "critical suspend",
425 "user standby",
426 "user suspend",
427 "system standby resume",
428 "capabilities change"
429 };
430 #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
431
432 typedef struct lookup_t {
433 int key;
434 char *msg;
435 } lookup_t;
436
437 /*
438 * The BIOS returns a set of standard error codes in AX when the
439 * carry flag is set.
440 */
441
442 static const lookup_t error_table[] = {
443 /* N/A { APM_SUCCESS, "Operation succeeded" }, */
444 { APM_DISABLED, "Power management disabled" },
445 { APM_CONNECTED, "Real mode interface already connected" },
446 { APM_NOT_CONNECTED, "Interface not connected" },
447 { APM_16_CONNECTED, "16 bit interface already connected" },
448 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
449 { APM_32_CONNECTED, "32 bit interface already connected" },
450 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
451 { APM_BAD_DEVICE, "Unrecognized device ID" },
452 { APM_BAD_PARAM, "Parameter out of range" },
453 { APM_NOT_ENGAGED, "Interface not engaged" },
454 { APM_BAD_FUNCTION, "Function not supported" },
455 { APM_RESUME_DISABLED, "Resume timer disabled" },
456 { APM_BAD_STATE, "Unable to enter requested state" },
457 /* N/A { APM_NO_EVENTS, "No events pending" }, */
458 { APM_NO_ERROR, "BIOS did not set a return code" },
459 { APM_NOT_PRESENT, "No APM present" }
460 };
461 #define ERROR_COUNT ARRAY_SIZE(error_table)
462
463 /**
464 * apm_error - display an APM error
465 * @str: information string
466 * @err: APM BIOS return code
467 *
468 * Write a meaningful log entry to the kernel log in the event of
469 * an APM error.
470 */
471
472 static void apm_error(char *str, int err)
473 {
474 int i;
475
476 for (i = 0; i < ERROR_COUNT; i++)
477 if (error_table[i].key == err)
478 break;
479 if (i < ERROR_COUNT)
480 printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
481 else
482 printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
483 str, err);
484 }
485
486 /*
487 * Lock APM functionality to physical CPU 0
488 */
489
490 #ifdef CONFIG_SMP
491
492 static cpumask_t apm_save_cpus(void)
493 {
494 cpumask_t x = current->cpus_allowed;
495 /* Some bioses don't like being called from CPU != 0 */
496 set_cpus_allowed(current, cpumask_of_cpu(0));
497 BUG_ON(smp_processor_id() != 0);
498 return x;
499 }
500
501 static inline void apm_restore_cpus(cpumask_t mask)
502 {
503 set_cpus_allowed(current, mask);
504 }
505
506 #else
507
508 /*
509 * No CPU lockdown needed on a uniprocessor
510 */
511
512 #define apm_save_cpus() (current->cpus_allowed)
513 #define apm_restore_cpus(x) (void)(x)
514
515 #endif
516
517 /*
518 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
519 * apm_info.allow_ints, we are being really paranoid here! Not only
520 * are interrupts disabled, but all the segment registers (except SS)
521 * are saved and zeroed this means that if the BIOS tries to reference
522 * any data without explicitly loading the segment registers, the kernel
523 * will fault immediately rather than have some unforeseen circumstances
524 * for the rest of the kernel. And it will be very obvious! :-) Doing
525 * this depends on CS referring to the same physical memory as DS so that
526 * DS can be zeroed before the call. Unfortunately, we can't do anything
527 * about the stack segment/pointer. Also, we tell the compiler that
528 * everything could change.
529 *
530 * Also, we KNOW that for the non error case of apm_bios_call, there
531 * is no useful data returned in the low order 8 bits of eax.
532 */
533
534 static inline unsigned long __apm_irq_save(void)
535 {
536 unsigned long flags;
537 local_save_flags(flags);
538 if (apm_info.allow_ints) {
539 if (irqs_disabled_flags(flags))
540 local_irq_enable();
541 } else
542 local_irq_disable();
543
544 return flags;
545 }
546
547 #define apm_irq_save(flags) \
548 do { flags = __apm_irq_save(); } while (0)
549
550 static inline void apm_irq_restore(unsigned long flags)
551 {
552 if (irqs_disabled_flags(flags))
553 local_irq_disable();
554 else if (irqs_disabled())
555 local_irq_enable();
556 }
557
558 #ifdef APM_ZERO_SEGS
559 # define APM_DECL_SEGS \
560 unsigned int saved_fs; unsigned int saved_gs;
561 # define APM_DO_SAVE_SEGS \
562 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
563 # define APM_DO_RESTORE_SEGS \
564 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
565 #else
566 # define APM_DECL_SEGS
567 # define APM_DO_SAVE_SEGS
568 # define APM_DO_RESTORE_SEGS
569 #endif
570
571 /**
572 * apm_bios_call - Make an APM BIOS 32bit call
573 * @func: APM function to execute
574 * @ebx_in: EBX register for call entry
575 * @ecx_in: ECX register for call entry
576 * @eax: EAX register return
577 * @ebx: EBX register return
578 * @ecx: ECX register return
579 * @edx: EDX register return
580 * @esi: ESI register return
581 *
582 * Make an APM call using the 32bit protected mode interface. The
583 * caller is responsible for knowing if APM BIOS is configured and
584 * enabled. This call can disable interrupts for a long period of
585 * time on some laptops. The return value is in AH and the carry
586 * flag is loaded into AL. If there is an error, then the error
587 * code is returned in AH (bits 8-15 of eax) and this function
588 * returns non-zero.
589 */
590
591 static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in,
592 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi)
593 {
594 APM_DECL_SEGS
595 unsigned long flags;
596 cpumask_t cpus;
597 int cpu;
598 struct desc_struct save_desc_40;
599 struct desc_struct *gdt;
600
601 cpus = apm_save_cpus();
602
603 cpu = get_cpu();
604 gdt = get_cpu_gdt_table(cpu);
605 save_desc_40 = gdt[0x40 / 8];
606 gdt[0x40 / 8] = bad_bios_desc;
607
608 apm_irq_save(flags);
609 APM_DO_SAVE_SEGS;
610 apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi);
611 APM_DO_RESTORE_SEGS;
612 apm_irq_restore(flags);
613 gdt[0x40 / 8] = save_desc_40;
614 put_cpu();
615 apm_restore_cpus(cpus);
616
617 return *eax & 0xff;
618 }
619
620 /**
621 * apm_bios_call_simple - make a simple APM BIOS 32bit call
622 * @func: APM function to invoke
623 * @ebx_in: EBX register value for BIOS call
624 * @ecx_in: ECX register value for BIOS call
625 * @eax: EAX register on return from the BIOS call
626 *
627 * Make a BIOS call that returns one value only, or just status.
628 * If there is an error, then the error code is returned in AH
629 * (bits 8-15 of eax) and this function returns non-zero. This is
630 * used for simpler BIOS operations. This call may hold interrupts
631 * off for a long time on some laptops.
632 */
633
634 static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax)
635 {
636 u8 error;
637 APM_DECL_SEGS
638 unsigned long flags;
639 cpumask_t cpus;
640 int cpu;
641 struct desc_struct save_desc_40;
642 struct desc_struct *gdt;
643
644 cpus = apm_save_cpus();
645
646 cpu = get_cpu();
647 gdt = get_cpu_gdt_table(cpu);
648 save_desc_40 = gdt[0x40 / 8];
649 gdt[0x40 / 8] = bad_bios_desc;
650
651 apm_irq_save(flags);
652 APM_DO_SAVE_SEGS;
653 error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax);
654 APM_DO_RESTORE_SEGS;
655 apm_irq_restore(flags);
656 gdt[0x40 / 8] = save_desc_40;
657 put_cpu();
658 apm_restore_cpus(cpus);
659 return error;
660 }
661
662 /**
663 * apm_driver_version - APM driver version
664 * @val: loaded with the APM version on return
665 *
666 * Retrieve the APM version supported by the BIOS. This is only
667 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
668 * probably present.
669 *
670 * On entry val should point to a value indicating the APM driver
671 * version with the high byte being the major and the low byte the
672 * minor number both in BCD
673 *
674 * On return it will hold the BIOS revision supported in the
675 * same format.
676 */
677
678 static int apm_driver_version(u_short *val)
679 {
680 u32 eax;
681
682 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax))
683 return (eax >> 8) & 0xff;
684 *val = eax;
685 return APM_SUCCESS;
686 }
687
688 /**
689 * apm_get_event - get an APM event from the BIOS
690 * @event: pointer to the event
691 * @info: point to the event information
692 *
693 * The APM BIOS provides a polled information for event
694 * reporting. The BIOS expects to be polled at least every second
695 * when events are pending. When a message is found the caller should
696 * poll until no more messages are present. However, this causes
697 * problems on some laptops where a suspend event notification is
698 * not cleared until it is acknowledged.
699 *
700 * Additional information is returned in the info pointer, providing
701 * that APM 1.2 is in use. If no messges are pending the value 0x80
702 * is returned (No power management events pending).
703 */
704
705 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
706 {
707 u32 eax;
708 u32 ebx;
709 u32 ecx;
710 u32 dummy;
711
712 if (apm_bios_call(APM_FUNC_GET_EVENT, 0, 0, &eax, &ebx, &ecx,
713 &dummy, &dummy))
714 return (eax >> 8) & 0xff;
715 *event = ebx;
716 if (apm_info.connection_version < 0x0102)
717 *info = ~0; /* indicate info not valid */
718 else
719 *info = ecx;
720 return APM_SUCCESS;
721 }
722
723 /**
724 * set_power_state - set the power management state
725 * @what: which items to transition
726 * @state: state to transition to
727 *
728 * Request an APM change of state for one or more system devices. The
729 * processor state must be transitioned last of all. what holds the
730 * class of device in the upper byte and the device number (0xFF for
731 * all) for the object to be transitioned.
732 *
733 * The state holds the state to transition to, which may in fact
734 * be an acceptance of a BIOS requested state change.
735 */
736
737 static int set_power_state(u_short what, u_short state)
738 {
739 u32 eax;
740
741 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax))
742 return (eax >> 8) & 0xff;
743 return APM_SUCCESS;
744 }
745
746 /**
747 * set_system_power_state - set system wide power state
748 * @state: which state to enter
749 *
750 * Transition the entire system into a new APM power state.
751 */
752
753 static int set_system_power_state(u_short state)
754 {
755 return set_power_state(APM_DEVICE_ALL, state);
756 }
757
758 /**
759 * apm_do_idle - perform power saving
760 *
761 * This function notifies the BIOS that the processor is (in the view
762 * of the OS) idle. It returns -1 in the event that the BIOS refuses
763 * to handle the idle request. On a success the function returns 1
764 * if the BIOS did clock slowing or 0 otherwise.
765 */
766
767 static int apm_do_idle(void)
768 {
769 u32 eax;
770 u8 ret = 0;
771 int idled = 0;
772 int polling;
773
774 polling = !!(current_thread_info()->status & TS_POLLING);
775 if (polling) {
776 current_thread_info()->status &= ~TS_POLLING;
777 /*
778 * TS_POLLING-cleared state must be visible before we
779 * test NEED_RESCHED:
780 */
781 smp_mb();
782 }
783 if (!need_resched()) {
784 idled = 1;
785 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax);
786 }
787 if (polling)
788 current_thread_info()->status |= TS_POLLING;
789
790 if (!idled)
791 return 0;
792
793 if (ret) {
794 static unsigned long t;
795
796 /* This always fails on some SMP boards running UP kernels.
797 * Only report the failure the first 5 times.
798 */
799 if (++t < 5) {
800 printk(KERN_DEBUG "apm_do_idle failed (%d)\n",
801 (eax >> 8) & 0xff);
802 t = jiffies;
803 }
804 return -1;
805 }
806 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
807 return clock_slowed;
808 }
809
810 /**
811 * apm_do_busy - inform the BIOS the CPU is busy
812 *
813 * Request that the BIOS brings the CPU back to full performance.
814 */
815
816 static void apm_do_busy(void)
817 {
818 u32 dummy;
819
820 if (clock_slowed || ALWAYS_CALL_BUSY) {
821 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy);
822 clock_slowed = 0;
823 }
824 }
825
826 /*
827 * If no process has really been interested in
828 * the CPU for some time, we want to call BIOS
829 * power management - we probably want
830 * to conserve power.
831 */
832 #define IDLE_CALC_LIMIT (HZ * 100)
833 #define IDLE_LEAKY_MAX 16
834
835 static void (*original_pm_idle)(void) __read_mostly;
836
837 /**
838 * apm_cpu_idle - cpu idling for APM capable Linux
839 *
840 * This is the idling function the kernel executes when APM is available. It
841 * tries to do BIOS powermanagement based on the average system idle time.
842 * Furthermore it calls the system default idle routine.
843 */
844
845 static void apm_cpu_idle(void)
846 {
847 static int use_apm_idle; /* = 0 */
848 static unsigned int last_jiffies; /* = 0 */
849 static unsigned int last_stime; /* = 0 */
850
851 int apm_idle_done = 0;
852 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
853 unsigned int bucket;
854
855 recalc:
856 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
857 use_apm_idle = 0;
858 last_jiffies = jiffies;
859 last_stime = current->stime;
860 } else if (jiffies_since_last_check > idle_period) {
861 unsigned int idle_percentage;
862
863 idle_percentage = current->stime - last_stime;
864 idle_percentage *= 100;
865 idle_percentage /= jiffies_since_last_check;
866 use_apm_idle = (idle_percentage > idle_threshold);
867 if (apm_info.forbid_idle)
868 use_apm_idle = 0;
869 last_jiffies = jiffies;
870 last_stime = current->stime;
871 }
872
873 bucket = IDLE_LEAKY_MAX;
874
875 while (!need_resched()) {
876 if (use_apm_idle) {
877 unsigned int t;
878
879 t = jiffies;
880 switch (apm_do_idle()) {
881 case 0:
882 apm_idle_done = 1;
883 if (t != jiffies) {
884 if (bucket) {
885 bucket = IDLE_LEAKY_MAX;
886 continue;
887 }
888 } else if (bucket) {
889 bucket--;
890 continue;
891 }
892 break;
893 case 1:
894 apm_idle_done = 1;
895 break;
896 default: /* BIOS refused */
897 break;
898 }
899 }
900 if (original_pm_idle)
901 original_pm_idle();
902 else
903 default_idle();
904 local_irq_disable();
905 jiffies_since_last_check = jiffies - last_jiffies;
906 if (jiffies_since_last_check > idle_period)
907 goto recalc;
908 }
909
910 if (apm_idle_done)
911 apm_do_busy();
912
913 local_irq_enable();
914 }
915
916 /**
917 * apm_power_off - ask the BIOS to power off
918 *
919 * Handle the power off sequence. This is the one piece of code we
920 * will execute even on SMP machines. In order to deal with BIOS
921 * bugs we support real mode APM BIOS power off calls. We also make
922 * the SMP call on CPU0 as some systems will only honour this call
923 * on their first cpu.
924 */
925
926 static void apm_power_off(void)
927 {
928 unsigned char po_bios_call[] = {
929 0xb8, 0x00, 0x10, /* movw $0x1000,ax */
930 0x8e, 0xd0, /* movw ax,ss */
931 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
932 0xb8, 0x07, 0x53, /* movw $0x5307,ax */
933 0xbb, 0x01, 0x00, /* movw $0x0001,bx */
934 0xb9, 0x03, 0x00, /* movw $0x0003,cx */
935 0xcd, 0x15 /* int $0x15 */
936 };
937
938 /* Some bioses don't like being called from CPU != 0 */
939 if (apm_info.realmode_power_off) {
940 (void)apm_save_cpus();
941 machine_real_restart(po_bios_call, sizeof(po_bios_call));
942 } else {
943 (void)set_system_power_state(APM_STATE_OFF);
944 }
945 }
946
947 #ifdef CONFIG_APM_DO_ENABLE
948
949 /**
950 * apm_enable_power_management - enable BIOS APM power management
951 * @enable: enable yes/no
952 *
953 * Enable or disable the APM BIOS power services.
954 */
955
956 static int apm_enable_power_management(int enable)
957 {
958 u32 eax;
959
960 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
961 return APM_NOT_ENGAGED;
962 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
963 enable, &eax))
964 return (eax >> 8) & 0xff;
965 if (enable)
966 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
967 else
968 apm_info.bios.flags |= APM_BIOS_DISABLED;
969 return APM_SUCCESS;
970 }
971 #endif
972
973 /**
974 * apm_get_power_status - get current power state
975 * @status: returned status
976 * @bat: battery info
977 * @life: estimated life
978 *
979 * Obtain the current power status from the APM BIOS. We return a
980 * status which gives the rough battery status, and current power
981 * source. The bat value returned give an estimate as a percentage
982 * of life and a status value for the battery. The estimated life
983 * if reported is a lifetime in secodnds/minutes at current powwer
984 * consumption.
985 */
986
987 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
988 {
989 u32 eax;
990 u32 ebx;
991 u32 ecx;
992 u32 edx;
993 u32 dummy;
994
995 if (apm_info.get_power_status_broken)
996 return APM_32_UNSUPPORTED;
997 if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0,
998 &eax, &ebx, &ecx, &edx, &dummy))
999 return (eax >> 8) & 0xff;
1000 *status = ebx;
1001 *bat = ecx;
1002 if (apm_info.get_power_status_swabinminutes) {
1003 *life = swab16((u16)edx);
1004 *life |= 0x8000;
1005 } else
1006 *life = edx;
1007 return APM_SUCCESS;
1008 }
1009
1010 #if 0
1011 static int apm_get_battery_status(u_short which, u_short *status,
1012 u_short *bat, u_short *life, u_short *nbat)
1013 {
1014 u32 eax;
1015 u32 ebx;
1016 u32 ecx;
1017 u32 edx;
1018 u32 esi;
1019
1020 if (apm_info.connection_version < 0x0102) {
1021 /* pretend we only have one battery. */
1022 if (which != 1)
1023 return APM_BAD_DEVICE;
1024 *nbat = 1;
1025 return apm_get_power_status(status, bat, life);
1026 }
1027
1028 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1029 &ebx, &ecx, &edx, &esi))
1030 return (eax >> 8) & 0xff;
1031 *status = ebx;
1032 *bat = ecx;
1033 *life = edx;
1034 *nbat = esi;
1035 return APM_SUCCESS;
1036 }
1037 #endif
1038
1039 /**
1040 * apm_engage_power_management - enable PM on a device
1041 * @device: identity of device
1042 * @enable: on/off
1043 *
1044 * Activate or deactive power management on either a specific device
1045 * or the entire system (%APM_DEVICE_ALL).
1046 */
1047
1048 static int apm_engage_power_management(u_short device, int enable)
1049 {
1050 u32 eax;
1051
1052 if ((enable == 0) && (device == APM_DEVICE_ALL)
1053 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1054 return APM_DISABLED;
1055 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax))
1056 return (eax >> 8) & 0xff;
1057 if (device == APM_DEVICE_ALL) {
1058 if (enable)
1059 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1060 else
1061 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1062 }
1063 return APM_SUCCESS;
1064 }
1065
1066 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1067
1068 /**
1069 * apm_console_blank - blank the display
1070 * @blank: on/off
1071 *
1072 * Attempt to blank the console, firstly by blanking just video device
1073 * zero, and if that fails (some BIOSes don't support it) then it blanks
1074 * all video devices. Typically the BIOS will do laptop backlight and
1075 * monitor powerdown for us.
1076 */
1077
1078 static int apm_console_blank(int blank)
1079 {
1080 int error = APM_NOT_ENGAGED; /* silence gcc */
1081 int i;
1082 u_short state;
1083 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1084
1085 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1086
1087 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1088 error = set_power_state(dev[i], state);
1089
1090 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1091 return 1;
1092
1093 if (error == APM_NOT_ENGAGED)
1094 break;
1095 }
1096
1097 if (error == APM_NOT_ENGAGED) {
1098 static int tried;
1099 int eng_error;
1100 if (tried++ == 0) {
1101 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1102 if (eng_error) {
1103 apm_error("set display", error);
1104 apm_error("engage interface", eng_error);
1105 return 0;
1106 } else
1107 return apm_console_blank(blank);
1108 }
1109 }
1110 apm_error("set display", error);
1111 return 0;
1112 }
1113 #endif
1114
1115 static int queue_empty(struct apm_user *as)
1116 {
1117 return as->event_head == as->event_tail;
1118 }
1119
1120 static apm_event_t get_queued_event(struct apm_user *as)
1121 {
1122 if (++as->event_tail >= APM_MAX_EVENTS)
1123 as->event_tail = 0;
1124 return as->events[as->event_tail];
1125 }
1126
1127 static void queue_event(apm_event_t event, struct apm_user *sender)
1128 {
1129 struct apm_user *as;
1130
1131 spin_lock(&user_list_lock);
1132 if (user_list == NULL)
1133 goto out;
1134 for (as = user_list; as != NULL; as = as->next) {
1135 if ((as == sender) || (!as->reader))
1136 continue;
1137 if (++as->event_head >= APM_MAX_EVENTS)
1138 as->event_head = 0;
1139
1140 if (as->event_head == as->event_tail) {
1141 static int notified;
1142
1143 if (notified++ == 0)
1144 printk(KERN_ERR "apm: an event queue overflowed\n");
1145 if (++as->event_tail >= APM_MAX_EVENTS)
1146 as->event_tail = 0;
1147 }
1148 as->events[as->event_head] = event;
1149 if (!as->suser || !as->writer)
1150 continue;
1151 switch (event) {
1152 case APM_SYS_SUSPEND:
1153 case APM_USER_SUSPEND:
1154 as->suspends_pending++;
1155 suspends_pending++;
1156 break;
1157
1158 case APM_SYS_STANDBY:
1159 case APM_USER_STANDBY:
1160 as->standbys_pending++;
1161 standbys_pending++;
1162 break;
1163 }
1164 }
1165 wake_up_interruptible(&apm_waitqueue);
1166 out:
1167 spin_unlock(&user_list_lock);
1168 }
1169
1170 static void reinit_timer(void)
1171 {
1172 #ifdef INIT_TIMER_AFTER_SUSPEND
1173 unsigned long flags;
1174
1175 spin_lock_irqsave(&i8253_lock, flags);
1176 /* set the clock to HZ */
1177 outb_pit(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1178 udelay(10);
1179 outb_pit(LATCH & 0xff, PIT_CH0); /* LSB */
1180 udelay(10);
1181 outb_pit(LATCH >> 8, PIT_CH0); /* MSB */
1182 udelay(10);
1183 spin_unlock_irqrestore(&i8253_lock, flags);
1184 #endif
1185 }
1186
1187 static int suspend(int vetoable)
1188 {
1189 int err;
1190 struct apm_user *as;
1191
1192 device_suspend(PMSG_SUSPEND);
1193 local_irq_disable();
1194 device_power_down(PMSG_SUSPEND);
1195 sysdev_suspend(PMSG_SUSPEND);
1196
1197 local_irq_enable();
1198
1199 save_processor_state();
1200 err = set_system_power_state(APM_STATE_SUSPEND);
1201 ignore_normal_resume = 1;
1202 restore_processor_state();
1203
1204 local_irq_disable();
1205 reinit_timer();
1206
1207 if (err == APM_NO_ERROR)
1208 err = APM_SUCCESS;
1209 if (err != APM_SUCCESS)
1210 apm_error("suspend", err);
1211 err = (err == APM_SUCCESS) ? 0 : -EIO;
1212 sysdev_resume();
1213 device_power_up(PMSG_RESUME);
1214 local_irq_enable();
1215 device_resume(PMSG_RESUME);
1216 queue_event(APM_NORMAL_RESUME, NULL);
1217 spin_lock(&user_list_lock);
1218 for (as = user_list; as != NULL; as = as->next) {
1219 as->suspend_wait = 0;
1220 as->suspend_result = err;
1221 }
1222 spin_unlock(&user_list_lock);
1223 wake_up_interruptible(&apm_suspend_waitqueue);
1224 return err;
1225 }
1226
1227 static void standby(void)
1228 {
1229 int err;
1230
1231 local_irq_disable();
1232 device_power_down(PMSG_SUSPEND);
1233 sysdev_suspend(PMSG_SUSPEND);
1234 local_irq_enable();
1235
1236 err = set_system_power_state(APM_STATE_STANDBY);
1237 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1238 apm_error("standby", err);
1239
1240 local_irq_disable();
1241 sysdev_resume();
1242 device_power_up(PMSG_RESUME);
1243 local_irq_enable();
1244 }
1245
1246 static apm_event_t get_event(void)
1247 {
1248 int error;
1249 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1250 apm_eventinfo_t info;
1251
1252 static int notified;
1253
1254 /* we don't use the eventinfo */
1255 error = apm_get_event(&event, &info);
1256 if (error == APM_SUCCESS)
1257 return event;
1258
1259 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1260 apm_error("get_event", error);
1261
1262 return 0;
1263 }
1264
1265 static void check_events(void)
1266 {
1267 apm_event_t event;
1268 static unsigned long last_resume;
1269 static int ignore_bounce;
1270
1271 while ((event = get_event()) != 0) {
1272 if (debug) {
1273 if (event <= NR_APM_EVENT_NAME)
1274 printk(KERN_DEBUG "apm: received %s notify\n",
1275 apm_event_name[event - 1]);
1276 else
1277 printk(KERN_DEBUG "apm: received unknown "
1278 "event 0x%02x\n", event);
1279 }
1280 if (ignore_bounce
1281 && (time_after(jiffies, last_resume + bounce_interval)))
1282 ignore_bounce = 0;
1283
1284 switch (event) {
1285 case APM_SYS_STANDBY:
1286 case APM_USER_STANDBY:
1287 queue_event(event, NULL);
1288 if (standbys_pending <= 0)
1289 standby();
1290 break;
1291
1292 case APM_USER_SUSPEND:
1293 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1294 if (apm_info.connection_version > 0x100)
1295 set_system_power_state(APM_STATE_REJECT);
1296 break;
1297 #endif
1298 case APM_SYS_SUSPEND:
1299 if (ignore_bounce) {
1300 if (apm_info.connection_version > 0x100)
1301 set_system_power_state(APM_STATE_REJECT);
1302 break;
1303 }
1304 /*
1305 * If we are already processing a SUSPEND,
1306 * then further SUSPEND events from the BIOS
1307 * will be ignored. We also return here to
1308 * cope with the fact that the Thinkpads keep
1309 * sending a SUSPEND event until something else
1310 * happens!
1311 */
1312 if (ignore_sys_suspend)
1313 return;
1314 ignore_sys_suspend = 1;
1315 queue_event(event, NULL);
1316 if (suspends_pending <= 0)
1317 (void) suspend(1);
1318 break;
1319
1320 case APM_NORMAL_RESUME:
1321 case APM_CRITICAL_RESUME:
1322 case APM_STANDBY_RESUME:
1323 ignore_sys_suspend = 0;
1324 last_resume = jiffies;
1325 ignore_bounce = 1;
1326 if ((event != APM_NORMAL_RESUME)
1327 || (ignore_normal_resume == 0)) {
1328 device_resume(PMSG_RESUME);
1329 queue_event(event, NULL);
1330 }
1331 ignore_normal_resume = 0;
1332 break;
1333
1334 case APM_CAPABILITY_CHANGE:
1335 case APM_LOW_BATTERY:
1336 case APM_POWER_STATUS_CHANGE:
1337 queue_event(event, NULL);
1338 /* If needed, notify drivers here */
1339 break;
1340
1341 case APM_UPDATE_TIME:
1342 break;
1343
1344 case APM_CRITICAL_SUSPEND:
1345 /*
1346 * We are not allowed to reject a critical suspend.
1347 */
1348 (void)suspend(0);
1349 break;
1350 }
1351 }
1352 }
1353
1354 static void apm_event_handler(void)
1355 {
1356 static int pending_count = 4;
1357 int err;
1358
1359 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1360 if ((apm_info.connection_version > 0x100) &&
1361 (pending_count-- <= 0)) {
1362 pending_count = 4;
1363 if (debug)
1364 printk(KERN_DEBUG "apm: setting state busy\n");
1365 err = set_system_power_state(APM_STATE_BUSY);
1366 if (err)
1367 apm_error("busy", err);
1368 }
1369 } else
1370 pending_count = 4;
1371 check_events();
1372 }
1373
1374 /*
1375 * This is the APM thread main loop.
1376 */
1377
1378 static void apm_mainloop(void)
1379 {
1380 DECLARE_WAITQUEUE(wait, current);
1381
1382 add_wait_queue(&apm_waitqueue, &wait);
1383 set_current_state(TASK_INTERRUPTIBLE);
1384 for (;;) {
1385 schedule_timeout(APM_CHECK_TIMEOUT);
1386 if (kthread_should_stop())
1387 break;
1388 /*
1389 * Ok, check all events, check for idle (and mark us sleeping
1390 * so as not to count towards the load average)..
1391 */
1392 set_current_state(TASK_INTERRUPTIBLE);
1393 apm_event_handler();
1394 }
1395 remove_wait_queue(&apm_waitqueue, &wait);
1396 }
1397
1398 static int check_apm_user(struct apm_user *as, const char *func)
1399 {
1400 if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1401 printk(KERN_ERR "apm: %s passed bad filp\n", func);
1402 return 1;
1403 }
1404 return 0;
1405 }
1406
1407 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1408 {
1409 struct apm_user *as;
1410 int i;
1411 apm_event_t event;
1412
1413 as = fp->private_data;
1414 if (check_apm_user(as, "read"))
1415 return -EIO;
1416 if ((int)count < sizeof(apm_event_t))
1417 return -EINVAL;
1418 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1419 return -EAGAIN;
1420 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1421 i = count;
1422 while ((i >= sizeof(event)) && !queue_empty(as)) {
1423 event = get_queued_event(as);
1424 if (copy_to_user(buf, &event, sizeof(event))) {
1425 if (i < count)
1426 break;
1427 return -EFAULT;
1428 }
1429 switch (event) {
1430 case APM_SYS_SUSPEND:
1431 case APM_USER_SUSPEND:
1432 as->suspends_read++;
1433 break;
1434
1435 case APM_SYS_STANDBY:
1436 case APM_USER_STANDBY:
1437 as->standbys_read++;
1438 break;
1439 }
1440 buf += sizeof(event);
1441 i -= sizeof(event);
1442 }
1443 if (i < count)
1444 return count - i;
1445 if (signal_pending(current))
1446 return -ERESTARTSYS;
1447 return 0;
1448 }
1449
1450 static unsigned int do_poll(struct file *fp, poll_table *wait)
1451 {
1452 struct apm_user *as;
1453
1454 as = fp->private_data;
1455 if (check_apm_user(as, "poll"))
1456 return 0;
1457 poll_wait(fp, &apm_waitqueue, wait);
1458 if (!queue_empty(as))
1459 return POLLIN | POLLRDNORM;
1460 return 0;
1461 }
1462
1463 static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1464 {
1465 struct apm_user *as;
1466 int ret;
1467
1468 as = filp->private_data;
1469 if (check_apm_user(as, "ioctl"))
1470 return -EIO;
1471 if (!as->suser || !as->writer)
1472 return -EPERM;
1473 switch (cmd) {
1474 case APM_IOC_STANDBY:
1475 lock_kernel();
1476 if (as->standbys_read > 0) {
1477 as->standbys_read--;
1478 as->standbys_pending--;
1479 standbys_pending--;
1480 } else
1481 queue_event(APM_USER_STANDBY, as);
1482 if (standbys_pending <= 0)
1483 standby();
1484 unlock_kernel();
1485 break;
1486 case APM_IOC_SUSPEND:
1487 lock_kernel();
1488 if (as->suspends_read > 0) {
1489 as->suspends_read--;
1490 as->suspends_pending--;
1491 suspends_pending--;
1492 } else
1493 queue_event(APM_USER_SUSPEND, as);
1494 if (suspends_pending <= 0) {
1495 ret = suspend(1);
1496 } else {
1497 as->suspend_wait = 1;
1498 wait_event_interruptible(apm_suspend_waitqueue,
1499 as->suspend_wait == 0);
1500 ret = as->suspend_result;
1501 }
1502 unlock_kernel();
1503 return ret;
1504 default:
1505 return -ENOTTY;
1506 }
1507 return 0;
1508 }
1509
1510 static int do_release(struct inode *inode, struct file *filp)
1511 {
1512 struct apm_user *as;
1513
1514 as = filp->private_data;
1515 if (check_apm_user(as, "release"))
1516 return 0;
1517 filp->private_data = NULL;
1518 if (as->standbys_pending > 0) {
1519 standbys_pending -= as->standbys_pending;
1520 if (standbys_pending <= 0)
1521 standby();
1522 }
1523 if (as->suspends_pending > 0) {
1524 suspends_pending -= as->suspends_pending;
1525 if (suspends_pending <= 0)
1526 (void) suspend(1);
1527 }
1528 spin_lock(&user_list_lock);
1529 if (user_list == as)
1530 user_list = as->next;
1531 else {
1532 struct apm_user *as1;
1533
1534 for (as1 = user_list;
1535 (as1 != NULL) && (as1->next != as);
1536 as1 = as1->next)
1537 ;
1538 if (as1 == NULL)
1539 printk(KERN_ERR "apm: filp not in user list\n");
1540 else
1541 as1->next = as->next;
1542 }
1543 spin_unlock(&user_list_lock);
1544 kfree(as);
1545 return 0;
1546 }
1547
1548 static int do_open(struct inode *inode, struct file *filp)
1549 {
1550 struct apm_user *as;
1551
1552 lock_kernel();
1553 as = kmalloc(sizeof(*as), GFP_KERNEL);
1554 if (as == NULL) {
1555 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1556 sizeof(*as));
1557 unlock_kernel();
1558 return -ENOMEM;
1559 }
1560 as->magic = APM_BIOS_MAGIC;
1561 as->event_tail = as->event_head = 0;
1562 as->suspends_pending = as->standbys_pending = 0;
1563 as->suspends_read = as->standbys_read = 0;
1564 /*
1565 * XXX - this is a tiny bit broken, when we consider BSD
1566 * process accounting. If the device is opened by root, we
1567 * instantly flag that we used superuser privs. Who knows,
1568 * we might close the device immediately without doing a
1569 * privileged operation -- cevans
1570 */
1571 as->suser = capable(CAP_SYS_ADMIN);
1572 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1573 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1574 spin_lock(&user_list_lock);
1575 as->next = user_list;
1576 user_list = as;
1577 spin_unlock(&user_list_lock);
1578 filp->private_data = as;
1579 unlock_kernel();
1580 return 0;
1581 }
1582
1583 static int proc_apm_show(struct seq_file *m, void *v)
1584 {
1585 unsigned short bx;
1586 unsigned short cx;
1587 unsigned short dx;
1588 int error;
1589 unsigned short ac_line_status = 0xff;
1590 unsigned short battery_status = 0xff;
1591 unsigned short battery_flag = 0xff;
1592 int percentage = -1;
1593 int time_units = -1;
1594 char *units = "?";
1595
1596 if ((num_online_cpus() == 1) &&
1597 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1598 ac_line_status = (bx >> 8) & 0xff;
1599 battery_status = bx & 0xff;
1600 if ((cx & 0xff) != 0xff)
1601 percentage = cx & 0xff;
1602
1603 if (apm_info.connection_version > 0x100) {
1604 battery_flag = (cx >> 8) & 0xff;
1605 if (dx != 0xffff) {
1606 units = (dx & 0x8000) ? "min" : "sec";
1607 time_units = dx & 0x7fff;
1608 }
1609 }
1610 }
1611 /* Arguments, with symbols from linux/apm_bios.h. Information is
1612 from the Get Power Status (0x0a) call unless otherwise noted.
1613
1614 0) Linux driver version (this will change if format changes)
1615 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1616 2) APM flags from APM Installation Check (0x00):
1617 bit 0: APM_16_BIT_SUPPORT
1618 bit 1: APM_32_BIT_SUPPORT
1619 bit 2: APM_IDLE_SLOWS_CLOCK
1620 bit 3: APM_BIOS_DISABLED
1621 bit 4: APM_BIOS_DISENGAGED
1622 3) AC line status
1623 0x00: Off-line
1624 0x01: On-line
1625 0x02: On backup power (BIOS >= 1.1 only)
1626 0xff: Unknown
1627 4) Battery status
1628 0x00: High
1629 0x01: Low
1630 0x02: Critical
1631 0x03: Charging
1632 0x04: Selected battery not present (BIOS >= 1.2 only)
1633 0xff: Unknown
1634 5) Battery flag
1635 bit 0: High
1636 bit 1: Low
1637 bit 2: Critical
1638 bit 3: Charging
1639 bit 7: No system battery
1640 0xff: Unknown
1641 6) Remaining battery life (percentage of charge):
1642 0-100: valid
1643 -1: Unknown
1644 7) Remaining battery life (time units):
1645 Number of remaining minutes or seconds
1646 -1: Unknown
1647 8) min = minutes; sec = seconds */
1648
1649 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1650 driver_version,
1651 (apm_info.bios.version >> 8) & 0xff,
1652 apm_info.bios.version & 0xff,
1653 apm_info.bios.flags,
1654 ac_line_status,
1655 battery_status,
1656 battery_flag,
1657 percentage,
1658 time_units,
1659 units);
1660 return 0;
1661 }
1662
1663 static int proc_apm_open(struct inode *inode, struct file *file)
1664 {
1665 return single_open(file, proc_apm_show, NULL);
1666 }
1667
1668 static const struct file_operations apm_file_ops = {
1669 .owner = THIS_MODULE,
1670 .open = proc_apm_open,
1671 .read = seq_read,
1672 .llseek = seq_lseek,
1673 .release = single_release,
1674 };
1675
1676 static int apm(void *unused)
1677 {
1678 unsigned short bx;
1679 unsigned short cx;
1680 unsigned short dx;
1681 int error;
1682 char *power_stat;
1683 char *bat_stat;
1684
1685 #ifdef CONFIG_SMP
1686 /* 2002/08/01 - WT
1687 * This is to avoid random crashes at boot time during initialization
1688 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1689 * Some bioses don't like being called from CPU != 0.
1690 * Method suggested by Ingo Molnar.
1691 */
1692 set_cpus_allowed(current, cpumask_of_cpu(0));
1693 BUG_ON(smp_processor_id() != 0);
1694 #endif
1695
1696 if (apm_info.connection_version == 0) {
1697 apm_info.connection_version = apm_info.bios.version;
1698 if (apm_info.connection_version > 0x100) {
1699 /*
1700 * We only support BIOSs up to version 1.2
1701 */
1702 if (apm_info.connection_version > 0x0102)
1703 apm_info.connection_version = 0x0102;
1704 error = apm_driver_version(&apm_info.connection_version);
1705 if (error != APM_SUCCESS) {
1706 apm_error("driver version", error);
1707 /* Fall back to an APM 1.0 connection. */
1708 apm_info.connection_version = 0x100;
1709 }
1710 }
1711 }
1712
1713 if (debug)
1714 printk(KERN_INFO "apm: Connection version %d.%d\n",
1715 (apm_info.connection_version >> 8) & 0xff,
1716 apm_info.connection_version & 0xff);
1717
1718 #ifdef CONFIG_APM_DO_ENABLE
1719 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1720 /*
1721 * This call causes my NEC UltraLite Versa 33/C to hang if it
1722 * is booted with PM disabled but not in the docking station.
1723 * Unfortunate ...
1724 */
1725 error = apm_enable_power_management(1);
1726 if (error) {
1727 apm_error("enable power management", error);
1728 return -1;
1729 }
1730 }
1731 #endif
1732
1733 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1734 && (apm_info.connection_version > 0x0100)) {
1735 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1736 if (error) {
1737 apm_error("engage power management", error);
1738 return -1;
1739 }
1740 }
1741
1742 if (debug && (num_online_cpus() == 1 || smp)) {
1743 error = apm_get_power_status(&bx, &cx, &dx);
1744 if (error)
1745 printk(KERN_INFO "apm: power status not available\n");
1746 else {
1747 switch ((bx >> 8) & 0xff) {
1748 case 0:
1749 power_stat = "off line";
1750 break;
1751 case 1:
1752 power_stat = "on line";
1753 break;
1754 case 2:
1755 power_stat = "on backup power";
1756 break;
1757 default:
1758 power_stat = "unknown";
1759 break;
1760 }
1761 switch (bx & 0xff) {
1762 case 0:
1763 bat_stat = "high";
1764 break;
1765 case 1:
1766 bat_stat = "low";
1767 break;
1768 case 2:
1769 bat_stat = "critical";
1770 break;
1771 case 3:
1772 bat_stat = "charging";
1773 break;
1774 default:
1775 bat_stat = "unknown";
1776 break;
1777 }
1778 printk(KERN_INFO
1779 "apm: AC %s, battery status %s, battery life ",
1780 power_stat, bat_stat);
1781 if ((cx & 0xff) == 0xff)
1782 printk("unknown\n");
1783 else
1784 printk("%d%%\n", cx & 0xff);
1785 if (apm_info.connection_version > 0x100) {
1786 printk(KERN_INFO
1787 "apm: battery flag 0x%02x, battery life ",
1788 (cx >> 8) & 0xff);
1789 if (dx == 0xffff)
1790 printk("unknown\n");
1791 else
1792 printk("%d %s\n", dx & 0x7fff,
1793 (dx & 0x8000) ?
1794 "minutes" : "seconds");
1795 }
1796 }
1797 }
1798
1799 /* Install our power off handler.. */
1800 if (power_off)
1801 pm_power_off = apm_power_off;
1802
1803 if (num_online_cpus() == 1 || smp) {
1804 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1805 console_blank_hook = apm_console_blank;
1806 #endif
1807 apm_mainloop();
1808 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1809 console_blank_hook = NULL;
1810 #endif
1811 }
1812
1813 return 0;
1814 }
1815
1816 #ifndef MODULE
1817 static int __init apm_setup(char *str)
1818 {
1819 int invert;
1820
1821 while ((str != NULL) && (*str != '\0')) {
1822 if (strncmp(str, "off", 3) == 0)
1823 apm_disabled = 1;
1824 if (strncmp(str, "on", 2) == 0)
1825 apm_disabled = 0;
1826 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1827 (strncmp(str, "bounce_interval=", 16) == 0))
1828 bounce_interval = simple_strtol(str + 16, NULL, 0);
1829 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1830 (strncmp(str, "idle_threshold=", 15) == 0))
1831 idle_threshold = simple_strtol(str + 15, NULL, 0);
1832 if ((strncmp(str, "idle-period=", 12) == 0) ||
1833 (strncmp(str, "idle_period=", 12) == 0))
1834 idle_period = simple_strtol(str + 12, NULL, 0);
1835 invert = (strncmp(str, "no-", 3) == 0) ||
1836 (strncmp(str, "no_", 3) == 0);
1837 if (invert)
1838 str += 3;
1839 if (strncmp(str, "debug", 5) == 0)
1840 debug = !invert;
1841 if ((strncmp(str, "power-off", 9) == 0) ||
1842 (strncmp(str, "power_off", 9) == 0))
1843 power_off = !invert;
1844 if (strncmp(str, "smp", 3) == 0) {
1845 smp = !invert;
1846 idle_threshold = 100;
1847 }
1848 if ((strncmp(str, "allow-ints", 10) == 0) ||
1849 (strncmp(str, "allow_ints", 10) == 0))
1850 apm_info.allow_ints = !invert;
1851 if ((strncmp(str, "broken-psr", 10) == 0) ||
1852 (strncmp(str, "broken_psr", 10) == 0))
1853 apm_info.get_power_status_broken = !invert;
1854 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1855 (strncmp(str, "realmode_power_off", 18) == 0))
1856 apm_info.realmode_power_off = !invert;
1857 str = strchr(str, ',');
1858 if (str != NULL)
1859 str += strspn(str, ", \t");
1860 }
1861 return 1;
1862 }
1863
1864 __setup("apm=", apm_setup);
1865 #endif
1866
1867 static const struct file_operations apm_bios_fops = {
1868 .owner = THIS_MODULE,
1869 .read = do_read,
1870 .poll = do_poll,
1871 .unlocked_ioctl = do_ioctl,
1872 .open = do_open,
1873 .release = do_release,
1874 };
1875
1876 static struct miscdevice apm_device = {
1877 APM_MINOR_DEV,
1878 "apm_bios",
1879 &apm_bios_fops
1880 };
1881
1882
1883 /* Simple "print if true" callback */
1884 static int __init print_if_true(const struct dmi_system_id *d)
1885 {
1886 printk("%s\n", d->ident);
1887 return 0;
1888 }
1889
1890 /*
1891 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1892 * disabled before the suspend. Linux used to get terribly confused by that.
1893 */
1894 static int __init broken_ps2_resume(const struct dmi_system_id *d)
1895 {
1896 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1897 "workaround hopefully not needed.\n", d->ident);
1898 return 0;
1899 }
1900
1901 /* Some bioses have a broken protected mode poweroff and need to use realmode */
1902 static int __init set_realmode_power_off(const struct dmi_system_id *d)
1903 {
1904 if (apm_info.realmode_power_off == 0) {
1905 apm_info.realmode_power_off = 1;
1906 printk(KERN_INFO "%s bios detected. "
1907 "Using realmode poweroff only.\n", d->ident);
1908 }
1909 return 0;
1910 }
1911
1912 /* Some laptops require interrupts to be enabled during APM calls */
1913 static int __init set_apm_ints(const struct dmi_system_id *d)
1914 {
1915 if (apm_info.allow_ints == 0) {
1916 apm_info.allow_ints = 1;
1917 printk(KERN_INFO "%s machine detected. "
1918 "Enabling interrupts during APM calls.\n", d->ident);
1919 }
1920 return 0;
1921 }
1922
1923 /* Some APM bioses corrupt memory or just plain do not work */
1924 static int __init apm_is_horked(const struct dmi_system_id *d)
1925 {
1926 if (apm_info.disabled == 0) {
1927 apm_info.disabled = 1;
1928 printk(KERN_INFO "%s machine detected. "
1929 "Disabling APM.\n", d->ident);
1930 }
1931 return 0;
1932 }
1933
1934 static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1935 {
1936 if (apm_info.disabled == 0) {
1937 apm_info.disabled = 1;
1938 printk(KERN_INFO "%s machine detected. "
1939 "Disabling APM.\n", d->ident);
1940 printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n");
1941 printk(KERN_INFO "download from support.intel.com \n");
1942 }
1943 return 0;
1944 }
1945
1946 /* Some APM bioses hang on APM idle calls */
1947 static int __init apm_likes_to_melt(const struct dmi_system_id *d)
1948 {
1949 if (apm_info.forbid_idle == 0) {
1950 apm_info.forbid_idle = 1;
1951 printk(KERN_INFO "%s machine detected. "
1952 "Disabling APM idle calls.\n", d->ident);
1953 }
1954 return 0;
1955 }
1956
1957 /*
1958 * Check for clue free BIOS implementations who use
1959 * the following QA technique
1960 *
1961 * [ Write BIOS Code ]<------
1962 * | ^
1963 * < Does it Compile >----N--
1964 * |Y ^
1965 * < Does it Boot Win98 >-N--
1966 * |Y
1967 * [Ship It]
1968 *
1969 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
1970 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
1971 */
1972 static int __init broken_apm_power(const struct dmi_system_id *d)
1973 {
1974 apm_info.get_power_status_broken = 1;
1975 printk(KERN_WARNING "BIOS strings suggest APM bugs, "
1976 "disabling power status reporting.\n");
1977 return 0;
1978 }
1979
1980 /*
1981 * This bios swaps the APM minute reporting bytes over (Many sony laptops
1982 * have this problem).
1983 */
1984 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
1985 {
1986 apm_info.get_power_status_swabinminutes = 1;
1987 printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
1988 "in minutes and wrong byte order.\n");
1989 return 0;
1990 }
1991
1992 static struct dmi_system_id __initdata apm_dmi_table[] = {
1993 {
1994 print_if_true,
1995 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
1996 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
1997 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
1998 },
1999 { /* Handle problems with APM on the C600 */
2000 broken_ps2_resume, "Dell Latitude C600",
2001 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2002 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2003 },
2004 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2005 set_apm_ints, "Dell Latitude",
2006 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2007 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2008 },
2009 { /* APM crashes */
2010 apm_is_horked, "Dell Inspiron 2500",
2011 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2012 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2013 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2014 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2015 },
2016 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2017 set_apm_ints, "Dell Inspiron", {
2018 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2019 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2020 },
2021 { /* Handle problems with APM on Inspiron 5000e */
2022 broken_apm_power, "Dell Inspiron 5000e",
2023 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2024 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2025 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2026 },
2027 { /* Handle problems with APM on Inspiron 2500 */
2028 broken_apm_power, "Dell Inspiron 2500",
2029 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2030 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2031 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2032 },
2033 { /* APM crashes */
2034 apm_is_horked, "Dell Dimension 4100",
2035 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2036 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2037 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2038 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2039 },
2040 { /* Allow interrupts during suspend on Compaq Laptops*/
2041 set_apm_ints, "Compaq 12XL125",
2042 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2043 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2044 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2045 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2046 },
2047 { /* Allow interrupts during APM or the clock goes slow */
2048 set_apm_ints, "ASUSTeK",
2049 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2050 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2051 },
2052 { /* APM blows on shutdown */
2053 apm_is_horked, "ABIT KX7-333[R]",
2054 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2055 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2056 },
2057 { /* APM crashes */
2058 apm_is_horked, "Trigem Delhi3",
2059 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2060 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2061 },
2062 { /* APM crashes */
2063 apm_is_horked, "Fujitsu-Siemens",
2064 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2065 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2066 },
2067 { /* APM crashes */
2068 apm_is_horked_d850md, "Intel D850MD",
2069 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2070 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2071 },
2072 { /* APM crashes */
2073 apm_is_horked, "Intel D810EMO",
2074 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2075 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2076 },
2077 { /* APM crashes */
2078 apm_is_horked, "Dell XPS-Z",
2079 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2080 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2081 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2082 },
2083 { /* APM crashes */
2084 apm_is_horked, "Sharp PC-PJ/AX",
2085 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2086 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2087 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2088 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2089 },
2090 { /* APM crashes */
2091 apm_is_horked, "Dell Inspiron 2500",
2092 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2093 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2094 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2095 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2096 },
2097 { /* APM idle hangs */
2098 apm_likes_to_melt, "Jabil AMD",
2099 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2100 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2101 },
2102 { /* APM idle hangs */
2103 apm_likes_to_melt, "AMI Bios",
2104 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2105 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2106 },
2107 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2108 swab_apm_power_in_minutes, "Sony VAIO",
2109 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2110 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2111 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2112 },
2113 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2114 swab_apm_power_in_minutes, "Sony VAIO",
2115 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2116 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2117 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2118 },
2119 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2120 swab_apm_power_in_minutes, "Sony VAIO",
2121 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2122 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2123 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2124 },
2125 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2126 swab_apm_power_in_minutes, "Sony VAIO",
2127 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2128 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2129 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2130 },
2131 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2132 swab_apm_power_in_minutes, "Sony VAIO",
2133 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2134 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2135 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2136 },
2137 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2138 swab_apm_power_in_minutes, "Sony VAIO",
2139 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2140 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2141 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2142 },
2143 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2144 swab_apm_power_in_minutes, "Sony VAIO",
2145 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2146 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2147 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2148 },
2149 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2150 swab_apm_power_in_minutes, "Sony VAIO",
2151 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2152 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2153 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2154 },
2155 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2156 swab_apm_power_in_minutes, "Sony VAIO",
2157 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2158 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2159 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2160 },
2161 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2162 swab_apm_power_in_minutes, "Sony VAIO",
2163 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2164 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2165 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2166 },
2167
2168 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2169 swab_apm_power_in_minutes, "Sony VAIO",
2170 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2171 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2172 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2173 },
2174 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2175 swab_apm_power_in_minutes, "Sony VAIO",
2176 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2177 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2178 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2179 },
2180 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2181 swab_apm_power_in_minutes, "Sony VAIO",
2182 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2183 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2184 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2185 },
2186 { /* broken PM poweroff bios */
2187 set_realmode_power_off, "Award Software v4.60 PGMA",
2188 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2189 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2190 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2191 },
2192
2193 /* Generic per vendor APM settings */
2194
2195 { /* Allow interrupts during suspend on IBM laptops */
2196 set_apm_ints, "IBM",
2197 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2198 },
2199
2200 { }
2201 };
2202
2203 /*
2204 * Just start the APM thread. We do NOT want to do APM BIOS
2205 * calls from anything but the APM thread, if for no other reason
2206 * than the fact that we don't trust the APM BIOS. This way,
2207 * most common APM BIOS problems that lead to protection errors
2208 * etc will have at least some level of being contained...
2209 *
2210 * In short, if something bad happens, at least we have a choice
2211 * of just killing the apm thread..
2212 */
2213 static int __init apm_init(void)
2214 {
2215 struct desc_struct *gdt;
2216 int err;
2217
2218 dmi_check_system(apm_dmi_table);
2219
2220 if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) {
2221 printk(KERN_INFO "apm: BIOS not found.\n");
2222 return -ENODEV;
2223 }
2224 printk(KERN_INFO
2225 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2226 ((apm_info.bios.version >> 8) & 0xff),
2227 (apm_info.bios.version & 0xff),
2228 apm_info.bios.flags,
2229 driver_version);
2230 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2231 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2232 return -ENODEV;
2233 }
2234
2235 if (allow_ints)
2236 apm_info.allow_ints = 1;
2237 if (broken_psr)
2238 apm_info.get_power_status_broken = 1;
2239 if (realmode_power_off)
2240 apm_info.realmode_power_off = 1;
2241 /* User can override, but default is to trust DMI */
2242 if (apm_disabled != -1)
2243 apm_info.disabled = apm_disabled;
2244
2245 /*
2246 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2247 * but is reportedly a 1.0 BIOS.
2248 */
2249 if (apm_info.bios.version == 0x001)
2250 apm_info.bios.version = 0x100;
2251
2252 /* BIOS < 1.2 doesn't set cseg_16_len */
2253 if (apm_info.bios.version < 0x102)
2254 apm_info.bios.cseg_16_len = 0; /* 64k */
2255
2256 if (debug) {
2257 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2258 apm_info.bios.cseg, apm_info.bios.offset,
2259 apm_info.bios.cseg_16, apm_info.bios.dseg);
2260 if (apm_info.bios.version > 0x100)
2261 printk(" cseg len %x, dseg len %x",
2262 apm_info.bios.cseg_len,
2263 apm_info.bios.dseg_len);
2264 if (apm_info.bios.version > 0x101)
2265 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2266 printk("\n");
2267 }
2268
2269 if (apm_info.disabled) {
2270 printk(KERN_NOTICE "apm: disabled on user request.\n");
2271 return -ENODEV;
2272 }
2273 if ((num_online_cpus() > 1) && !power_off && !smp) {
2274 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2275 apm_info.disabled = 1;
2276 return -ENODEV;
2277 }
2278 if (pm_flags & PM_ACPI) {
2279 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2280 apm_info.disabled = 1;
2281 return -ENODEV;
2282 }
2283 pm_flags |= PM_APM;
2284
2285 /*
2286 * Set up a segment that references the real mode segment 0x40
2287 * that extends up to the end of page zero (that we have reserved).
2288 * This is for buggy BIOS's that refer to (real mode) segment 0x40
2289 * even though they are called in protected mode.
2290 */
2291 set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
2292 _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
2293
2294 /*
2295 * Set up the long jump entry point to the APM BIOS, which is called
2296 * from inline assembly.
2297 */
2298 apm_bios_entry.offset = apm_info.bios.offset;
2299 apm_bios_entry.segment = APM_CS;
2300
2301 /*
2302 * The APM 1.1 BIOS is supposed to provide limit information that it
2303 * recognizes. Many machines do this correctly, but many others do
2304 * not restrict themselves to their claimed limit. When this happens,
2305 * they will cause a segmentation violation in the kernel at boot time.
2306 * Most BIOS's, however, will respect a 64k limit, so we use that.
2307 *
2308 * Note we only set APM segments on CPU zero, since we pin the APM
2309 * code to that CPU.
2310 */
2311 gdt = get_cpu_gdt_table(0);
2312 set_base(gdt[APM_CS >> 3],
2313 __va((unsigned long)apm_info.bios.cseg << 4));
2314 set_base(gdt[APM_CS_16 >> 3],
2315 __va((unsigned long)apm_info.bios.cseg_16 << 4));
2316 set_base(gdt[APM_DS >> 3],
2317 __va((unsigned long)apm_info.bios.dseg << 4));
2318
2319 proc_create("apm", 0, NULL, &apm_file_ops);
2320
2321 kapmd_task = kthread_create(apm, NULL, "kapmd");
2322 if (IS_ERR(kapmd_task)) {
2323 printk(KERN_ERR "apm: disabled - Unable to start kernel "
2324 "thread.\n");
2325 err = PTR_ERR(kapmd_task);
2326 kapmd_task = NULL;
2327 remove_proc_entry("apm", NULL);
2328 return err;
2329 }
2330 wake_up_process(kapmd_task);
2331
2332 if (num_online_cpus() > 1 && !smp) {
2333 printk(KERN_NOTICE
2334 "apm: disabled - APM is not SMP safe (power off active).\n");
2335 return 0;
2336 }
2337
2338 /*
2339 * Note we don't actually care if the misc_device cannot be registered.
2340 * this driver can do its job without it, even if userspace can't
2341 * control it. just log the error
2342 */
2343 if (misc_register(&apm_device))
2344 printk(KERN_WARNING "apm: Could not register misc device.\n");
2345
2346 if (HZ != 100)
2347 idle_period = (idle_period * HZ) / 100;
2348 if (idle_threshold < 100) {
2349 original_pm_idle = pm_idle;
2350 pm_idle = apm_cpu_idle;
2351 set_pm_idle = 1;
2352 }
2353
2354 return 0;
2355 }
2356
2357 static void __exit apm_exit(void)
2358 {
2359 int error;
2360
2361 if (set_pm_idle) {
2362 pm_idle = original_pm_idle;
2363 /*
2364 * We are about to unload the current idle thread pm callback
2365 * (pm_idle), Wait for all processors to update cached/local
2366 * copies of pm_idle before proceeding.
2367 */
2368 cpu_idle_wait();
2369 }
2370 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2371 && (apm_info.connection_version > 0x0100)) {
2372 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2373 if (error)
2374 apm_error("disengage power management", error);
2375 }
2376 misc_deregister(&apm_device);
2377 remove_proc_entry("apm", NULL);
2378 if (power_off)
2379 pm_power_off = NULL;
2380 if (kapmd_task) {
2381 kthread_stop(kapmd_task);
2382 kapmd_task = NULL;
2383 }
2384 pm_flags &= ~PM_APM;
2385 }
2386
2387 module_init(apm_init);
2388 module_exit(apm_exit);
2389
2390 MODULE_AUTHOR("Stephen Rothwell");
2391 MODULE_DESCRIPTION("Advanced Power Management");
2392 MODULE_LICENSE("GPL");
2393 module_param(debug, bool, 0644);
2394 MODULE_PARM_DESC(debug, "Enable debug mode");
2395 module_param(power_off, bool, 0444);
2396 MODULE_PARM_DESC(power_off, "Enable power off");
2397 module_param(bounce_interval, int, 0444);
2398 MODULE_PARM_DESC(bounce_interval,
2399 "Set the number of ticks to ignore suspend bounces");
2400 module_param(allow_ints, bool, 0444);
2401 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2402 module_param(broken_psr, bool, 0444);
2403 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2404 module_param(realmode_power_off, bool, 0444);
2405 MODULE_PARM_DESC(realmode_power_off,
2406 "Switch to real mode before powering off");
2407 module_param(idle_threshold, int, 0444);
2408 MODULE_PARM_DESC(idle_threshold,
2409 "System idle percentage above which to make APM BIOS idle calls");
2410 module_param(idle_period, int, 0444);
2411 MODULE_PARM_DESC(idle_period,
2412 "Period (in sec/100) over which to caculate the idle percentage");
2413 module_param(smp, bool, 0444);
2414 MODULE_PARM_DESC(smp,
2415 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2416 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
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