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[deliverable/linux.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@redhat.com>).
164 * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
165 * calling it - instead idle. (Alan Cox <alan@redhat.com>)
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/pm_legacy.h>
223 #include <linux/capability.h>
224 #include <linux/device.h>
225 #include <linux/kernel.h>
226 #include <linux/freezer.h>
227 #include <linux/smp.h>
228 #include <linux/dmi.h>
229 #include <linux/suspend.h>
230 #include <linux/kthread.h>
231 #include <linux/jiffies.h>
232 #include <linux/smp_lock.h>
233
234 #include <asm/system.h>
235 #include <asm/uaccess.h>
236 #include <asm/desc.h>
237 #include <asm/i8253.h>
238 #include <asm/paravirt.h>
239 #include <asm/reboot.h>
240
241 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
242 extern int (*console_blank_hook)(int);
243 #endif
244
245 /*
246 * The apm_bios device is one of the misc char devices.
247 * This is its minor number.
248 */
249 #define APM_MINOR_DEV 134
250
251 /*
252 * See Documentation/Config.help for the configuration options.
253 *
254 * Various options can be changed at boot time as follows:
255 * (We allow underscores for compatibility with the modules code)
256 * apm=on/off enable/disable APM
257 * [no-]allow[-_]ints allow interrupts during BIOS calls
258 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
259 * [no-]realmode[-_]power[-_]off switch to real mode before
260 * powering off
261 * [no-]debug log some debugging messages
262 * [no-]power[-_]off power off on shutdown
263 * [no-]smp Use apm even on an SMP box
264 * bounce[-_]interval=<n> number of ticks to ignore suspend
265 * bounces
266 * idle[-_]threshold=<n> System idle percentage above which to
267 * make APM BIOS idle calls. Set it to
268 * 100 to disable.
269 * idle[-_]period=<n> Period (in 1/100s of a second) over
270 * which the idle percentage is
271 * calculated.
272 */
273
274 /* KNOWN PROBLEM MACHINES:
275 *
276 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
277 * [Confirmed by TI representative]
278 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
279 * [Confirmed by BIOS disassembly]
280 * [This may work now ...]
281 * P: Toshiba 1950S: battery life information only gets updated after resume
282 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
283 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
284 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
285 * Neale Banks <neale@lowendale.com.au> December 2000
286 *
287 * Legend: U = unusable with APM patches
288 * P = partially usable with APM patches
289 */
290
291 /*
292 * Define as 1 to make the driver always call the APM BIOS busy
293 * routine even if the clock was not reported as slowed by the
294 * idle routine. Otherwise, define as 0.
295 */
296 #define ALWAYS_CALL_BUSY 1
297
298 /*
299 * Define to make the APM BIOS calls zero all data segment registers (so
300 * that an incorrect BIOS implementation will cause a kernel panic if it
301 * tries to write to arbitrary memory).
302 */
303 #define APM_ZERO_SEGS
304
305 #include "apm.h"
306
307 /*
308 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
309 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
310 * David Chen <chen@ctpa04.mit.edu>
311 */
312 #undef INIT_TIMER_AFTER_SUSPEND
313
314 #ifdef INIT_TIMER_AFTER_SUSPEND
315 #include <linux/timex.h>
316 #include <asm/io.h>
317 #include <linux/delay.h>
318 #endif
319
320 /*
321 * Need to poll the APM BIOS every second
322 */
323 #define APM_CHECK_TIMEOUT (HZ)
324
325 /*
326 * Ignore suspend events for this amount of time after a resume
327 */
328 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
329
330 /*
331 * Maximum number of events stored
332 */
333 #define APM_MAX_EVENTS 20
334
335 /*
336 * The per-file APM data
337 */
338 struct apm_user {
339 int magic;
340 struct apm_user *next;
341 unsigned int suser: 1;
342 unsigned int writer: 1;
343 unsigned int reader: 1;
344 unsigned int suspend_wait: 1;
345 int suspend_result;
346 int suspends_pending;
347 int standbys_pending;
348 int suspends_read;
349 int standbys_read;
350 int event_head;
351 int event_tail;
352 apm_event_t events[APM_MAX_EVENTS];
353 };
354
355 /*
356 * The magic number in apm_user
357 */
358 #define APM_BIOS_MAGIC 0x4101
359
360 /*
361 * idle percentage above which bios idle calls are done
362 */
363 #ifdef CONFIG_APM_CPU_IDLE
364 #define DEFAULT_IDLE_THRESHOLD 95
365 #else
366 #define DEFAULT_IDLE_THRESHOLD 100
367 #endif
368 #define DEFAULT_IDLE_PERIOD (100 / 3)
369
370 /*
371 * Local variables
372 */
373 static struct {
374 unsigned long offset;
375 unsigned short segment;
376 } apm_bios_entry;
377 static int clock_slowed;
378 static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
379 static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
380 static int set_pm_idle;
381 static int suspends_pending;
382 static int standbys_pending;
383 static int ignore_sys_suspend;
384 static int ignore_normal_resume;
385 static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
386
387 static int debug __read_mostly;
388 static int smp __read_mostly;
389 static int apm_disabled = -1;
390 #ifdef CONFIG_SMP
391 static int power_off;
392 #else
393 static int power_off = 1;
394 #endif
395 #ifdef CONFIG_APM_REAL_MODE_POWER_OFF
396 static int realmode_power_off = 1;
397 #else
398 static int realmode_power_off;
399 #endif
400 #ifdef CONFIG_APM_ALLOW_INTS
401 static int allow_ints = 1;
402 #else
403 static int allow_ints;
404 #endif
405 static int broken_psr;
406
407 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
408 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
409 static struct apm_user *user_list;
410 static DEFINE_SPINLOCK(user_list_lock);
411 static const struct desc_struct bad_bios_desc = { { { 0, 0x00409200 } } };
412
413 static const char driver_version[] = "1.16ac"; /* no spaces */
414
415 static struct task_struct *kapmd_task;
416
417 /*
418 * APM event names taken from the APM 1.2 specification. These are
419 * the message codes that the BIOS uses to tell us about events
420 */
421 static const char * const apm_event_name[] = {
422 "system standby",
423 "system suspend",
424 "normal resume",
425 "critical resume",
426 "low battery",
427 "power status change",
428 "update time",
429 "critical suspend",
430 "user standby",
431 "user suspend",
432 "system standby resume",
433 "capabilities change"
434 };
435 #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
436
437 typedef struct lookup_t {
438 int key;
439 char *msg;
440 } lookup_t;
441
442 /*
443 * The BIOS returns a set of standard error codes in AX when the
444 * carry flag is set.
445 */
446
447 static const lookup_t error_table[] = {
448 /* N/A { APM_SUCCESS, "Operation succeeded" }, */
449 { APM_DISABLED, "Power management disabled" },
450 { APM_CONNECTED, "Real mode interface already connected" },
451 { APM_NOT_CONNECTED, "Interface not connected" },
452 { APM_16_CONNECTED, "16 bit interface already connected" },
453 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
454 { APM_32_CONNECTED, "32 bit interface already connected" },
455 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
456 { APM_BAD_DEVICE, "Unrecognized device ID" },
457 { APM_BAD_PARAM, "Parameter out of range" },
458 { APM_NOT_ENGAGED, "Interface not engaged" },
459 { APM_BAD_FUNCTION, "Function not supported" },
460 { APM_RESUME_DISABLED, "Resume timer disabled" },
461 { APM_BAD_STATE, "Unable to enter requested state" },
462 /* N/A { APM_NO_EVENTS, "No events pending" }, */
463 { APM_NO_ERROR, "BIOS did not set a return code" },
464 { APM_NOT_PRESENT, "No APM present" }
465 };
466 #define ERROR_COUNT ARRAY_SIZE(error_table)
467
468 /**
469 * apm_error - display an APM error
470 * @str: information string
471 * @err: APM BIOS return code
472 *
473 * Write a meaningful log entry to the kernel log in the event of
474 * an APM error.
475 */
476
477 static void apm_error(char *str, int err)
478 {
479 int i;
480
481 for (i = 0; i < ERROR_COUNT; i++)
482 if (error_table[i].key == err)
483 break;
484 if (i < ERROR_COUNT)
485 printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
486 else
487 printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
488 str, err);
489 }
490
491 /*
492 * Lock APM functionality to physical CPU 0
493 */
494
495 #ifdef CONFIG_SMP
496
497 static cpumask_t apm_save_cpus(void)
498 {
499 cpumask_t x = current->cpus_allowed;
500 /* Some bioses don't like being called from CPU != 0 */
501 set_cpus_allowed(current, cpumask_of_cpu(0));
502 BUG_ON(smp_processor_id() != 0);
503 return x;
504 }
505
506 static inline void apm_restore_cpus(cpumask_t mask)
507 {
508 set_cpus_allowed(current, mask);
509 }
510
511 #else
512
513 /*
514 * No CPU lockdown needed on a uniprocessor
515 */
516
517 #define apm_save_cpus() (current->cpus_allowed)
518 #define apm_restore_cpus(x) (void)(x)
519
520 #endif
521
522 /*
523 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
524 * apm_info.allow_ints, we are being really paranoid here! Not only
525 * are interrupts disabled, but all the segment registers (except SS)
526 * are saved and zeroed this means that if the BIOS tries to reference
527 * any data without explicitly loading the segment registers, the kernel
528 * will fault immediately rather than have some unforeseen circumstances
529 * for the rest of the kernel. And it will be very obvious! :-) Doing
530 * this depends on CS referring to the same physical memory as DS so that
531 * DS can be zeroed before the call. Unfortunately, we can't do anything
532 * about the stack segment/pointer. Also, we tell the compiler that
533 * everything could change.
534 *
535 * Also, we KNOW that for the non error case of apm_bios_call, there
536 * is no useful data returned in the low order 8 bits of eax.
537 */
538
539 static inline unsigned long __apm_irq_save(void)
540 {
541 unsigned long flags;
542 local_save_flags(flags);
543 if (apm_info.allow_ints) {
544 if (irqs_disabled_flags(flags))
545 local_irq_enable();
546 } else
547 local_irq_disable();
548
549 return flags;
550 }
551
552 #define apm_irq_save(flags) \
553 do { flags = __apm_irq_save(); } while (0)
554
555 static inline void apm_irq_restore(unsigned long flags)
556 {
557 if (irqs_disabled_flags(flags))
558 local_irq_disable();
559 else if (irqs_disabled())
560 local_irq_enable();
561 }
562
563 #ifdef APM_ZERO_SEGS
564 # define APM_DECL_SEGS \
565 unsigned int saved_fs; unsigned int saved_gs;
566 # define APM_DO_SAVE_SEGS \
567 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
568 # define APM_DO_RESTORE_SEGS \
569 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
570 #else
571 # define APM_DECL_SEGS
572 # define APM_DO_SAVE_SEGS
573 # define APM_DO_RESTORE_SEGS
574 #endif
575
576 /**
577 * apm_bios_call - Make an APM BIOS 32bit call
578 * @func: APM function to execute
579 * @ebx_in: EBX register for call entry
580 * @ecx_in: ECX register for call entry
581 * @eax: EAX register return
582 * @ebx: EBX register return
583 * @ecx: ECX register return
584 * @edx: EDX register return
585 * @esi: ESI register return
586 *
587 * Make an APM call using the 32bit protected mode interface. The
588 * caller is responsible for knowing if APM BIOS is configured and
589 * enabled. This call can disable interrupts for a long period of
590 * time on some laptops. The return value is in AH and the carry
591 * flag is loaded into AL. If there is an error, then the error
592 * code is returned in AH (bits 8-15 of eax) and this function
593 * returns non-zero.
594 */
595
596 static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in,
597 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi)
598 {
599 APM_DECL_SEGS
600 unsigned long flags;
601 cpumask_t cpus;
602 int cpu;
603 struct desc_struct save_desc_40;
604 struct desc_struct *gdt;
605
606 cpus = apm_save_cpus();
607
608 cpu = get_cpu();
609 gdt = get_cpu_gdt_table(cpu);
610 save_desc_40 = gdt[0x40 / 8];
611 gdt[0x40 / 8] = bad_bios_desc;
612
613 apm_irq_save(flags);
614 APM_DO_SAVE_SEGS;
615 apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi);
616 APM_DO_RESTORE_SEGS;
617 apm_irq_restore(flags);
618 gdt[0x40 / 8] = save_desc_40;
619 put_cpu();
620 apm_restore_cpus(cpus);
621
622 return *eax & 0xff;
623 }
624
625 /**
626 * apm_bios_call_simple - make a simple APM BIOS 32bit call
627 * @func: APM function to invoke
628 * @ebx_in: EBX register value for BIOS call
629 * @ecx_in: ECX register value for BIOS call
630 * @eax: EAX register on return from the BIOS call
631 *
632 * Make a BIOS call that returns one value only, or just status.
633 * If there is an error, then the error code is returned in AH
634 * (bits 8-15 of eax) and this function returns non-zero. This is
635 * used for simpler BIOS operations. This call may hold interrupts
636 * off for a long time on some laptops.
637 */
638
639 static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax)
640 {
641 u8 error;
642 APM_DECL_SEGS
643 unsigned long flags;
644 cpumask_t cpus;
645 int cpu;
646 struct desc_struct save_desc_40;
647 struct desc_struct *gdt;
648
649 cpus = apm_save_cpus();
650
651 cpu = get_cpu();
652 gdt = get_cpu_gdt_table(cpu);
653 save_desc_40 = gdt[0x40 / 8];
654 gdt[0x40 / 8] = bad_bios_desc;
655
656 apm_irq_save(flags);
657 APM_DO_SAVE_SEGS;
658 error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax);
659 APM_DO_RESTORE_SEGS;
660 apm_irq_restore(flags);
661 gdt[0x40 / 8] = save_desc_40;
662 put_cpu();
663 apm_restore_cpus(cpus);
664 return error;
665 }
666
667 /**
668 * apm_driver_version - APM driver version
669 * @val: loaded with the APM version on return
670 *
671 * Retrieve the APM version supported by the BIOS. This is only
672 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
673 * probably present.
674 *
675 * On entry val should point to a value indicating the APM driver
676 * version with the high byte being the major and the low byte the
677 * minor number both in BCD
678 *
679 * On return it will hold the BIOS revision supported in the
680 * same format.
681 */
682
683 static int apm_driver_version(u_short *val)
684 {
685 u32 eax;
686
687 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax))
688 return (eax >> 8) & 0xff;
689 *val = eax;
690 return APM_SUCCESS;
691 }
692
693 /**
694 * apm_get_event - get an APM event from the BIOS
695 * @event: pointer to the event
696 * @info: point to the event information
697 *
698 * The APM BIOS provides a polled information for event
699 * reporting. The BIOS expects to be polled at least every second
700 * when events are pending. When a message is found the caller should
701 * poll until no more messages are present. However, this causes
702 * problems on some laptops where a suspend event notification is
703 * not cleared until it is acknowledged.
704 *
705 * Additional information is returned in the info pointer, providing
706 * that APM 1.2 is in use. If no messges are pending the value 0x80
707 * is returned (No power management events pending).
708 */
709
710 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
711 {
712 u32 eax;
713 u32 ebx;
714 u32 ecx;
715 u32 dummy;
716
717 if (apm_bios_call(APM_FUNC_GET_EVENT, 0, 0, &eax, &ebx, &ecx,
718 &dummy, &dummy))
719 return (eax >> 8) & 0xff;
720 *event = ebx;
721 if (apm_info.connection_version < 0x0102)
722 *info = ~0; /* indicate info not valid */
723 else
724 *info = ecx;
725 return APM_SUCCESS;
726 }
727
728 /**
729 * set_power_state - set the power management state
730 * @what: which items to transition
731 * @state: state to transition to
732 *
733 * Request an APM change of state for one or more system devices. The
734 * processor state must be transitioned last of all. what holds the
735 * class of device in the upper byte and the device number (0xFF for
736 * all) for the object to be transitioned.
737 *
738 * The state holds the state to transition to, which may in fact
739 * be an acceptance of a BIOS requested state change.
740 */
741
742 static int set_power_state(u_short what, u_short state)
743 {
744 u32 eax;
745
746 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax))
747 return (eax >> 8) & 0xff;
748 return APM_SUCCESS;
749 }
750
751 /**
752 * set_system_power_state - set system wide power state
753 * @state: which state to enter
754 *
755 * Transition the entire system into a new APM power state.
756 */
757
758 static int set_system_power_state(u_short state)
759 {
760 return set_power_state(APM_DEVICE_ALL, state);
761 }
762
763 /**
764 * apm_do_idle - perform power saving
765 *
766 * This function notifies the BIOS that the processor is (in the view
767 * of the OS) idle. It returns -1 in the event that the BIOS refuses
768 * to handle the idle request. On a success the function returns 1
769 * if the BIOS did clock slowing or 0 otherwise.
770 */
771
772 static int apm_do_idle(void)
773 {
774 u32 eax;
775 u8 ret = 0;
776 int idled = 0;
777 int polling;
778
779 polling = !!(current_thread_info()->status & TS_POLLING);
780 if (polling) {
781 current_thread_info()->status &= ~TS_POLLING;
782 /*
783 * TS_POLLING-cleared state must be visible before we
784 * test NEED_RESCHED:
785 */
786 smp_mb();
787 }
788 if (!need_resched()) {
789 idled = 1;
790 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax);
791 }
792 if (polling)
793 current_thread_info()->status |= TS_POLLING;
794
795 if (!idled)
796 return 0;
797
798 if (ret) {
799 static unsigned long t;
800
801 /* This always fails on some SMP boards running UP kernels.
802 * Only report the failure the first 5 times.
803 */
804 if (++t < 5) {
805 printk(KERN_DEBUG "apm_do_idle failed (%d)\n",
806 (eax >> 8) & 0xff);
807 t = jiffies;
808 }
809 return -1;
810 }
811 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
812 return clock_slowed;
813 }
814
815 /**
816 * apm_do_busy - inform the BIOS the CPU is busy
817 *
818 * Request that the BIOS brings the CPU back to full performance.
819 */
820
821 static void apm_do_busy(void)
822 {
823 u32 dummy;
824
825 if (clock_slowed || ALWAYS_CALL_BUSY) {
826 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy);
827 clock_slowed = 0;
828 }
829 }
830
831 /*
832 * If no process has really been interested in
833 * the CPU for some time, we want to call BIOS
834 * power management - we probably want
835 * to conserve power.
836 */
837 #define IDLE_CALC_LIMIT (HZ * 100)
838 #define IDLE_LEAKY_MAX 16
839
840 static void (*original_pm_idle)(void) __read_mostly;
841
842 /**
843 * apm_cpu_idle - cpu idling for APM capable Linux
844 *
845 * This is the idling function the kernel executes when APM is available. It
846 * tries to do BIOS powermanagement based on the average system idle time.
847 * Furthermore it calls the system default idle routine.
848 */
849
850 static void apm_cpu_idle(void)
851 {
852 static int use_apm_idle; /* = 0 */
853 static unsigned int last_jiffies; /* = 0 */
854 static unsigned int last_stime; /* = 0 */
855
856 int apm_idle_done = 0;
857 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
858 unsigned int bucket;
859
860 recalc:
861 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
862 use_apm_idle = 0;
863 last_jiffies = jiffies;
864 last_stime = current->stime;
865 } else if (jiffies_since_last_check > idle_period) {
866 unsigned int idle_percentage;
867
868 idle_percentage = current->stime - last_stime;
869 idle_percentage *= 100;
870 idle_percentage /= jiffies_since_last_check;
871 use_apm_idle = (idle_percentage > idle_threshold);
872 if (apm_info.forbid_idle)
873 use_apm_idle = 0;
874 last_jiffies = jiffies;
875 last_stime = current->stime;
876 }
877
878 bucket = IDLE_LEAKY_MAX;
879
880 while (!need_resched()) {
881 if (use_apm_idle) {
882 unsigned int t;
883
884 t = jiffies;
885 switch (apm_do_idle()) {
886 case 0:
887 apm_idle_done = 1;
888 if (t != jiffies) {
889 if (bucket) {
890 bucket = IDLE_LEAKY_MAX;
891 continue;
892 }
893 } else if (bucket) {
894 bucket--;
895 continue;
896 }
897 break;
898 case 1:
899 apm_idle_done = 1;
900 break;
901 default: /* BIOS refused */
902 break;
903 }
904 }
905 if (original_pm_idle)
906 original_pm_idle();
907 else
908 default_idle();
909 local_irq_disable();
910 jiffies_since_last_check = jiffies - last_jiffies;
911 if (jiffies_since_last_check > idle_period)
912 goto recalc;
913 }
914
915 if (apm_idle_done)
916 apm_do_busy();
917
918 local_irq_enable();
919 }
920
921 /**
922 * apm_power_off - ask the BIOS to power off
923 *
924 * Handle the power off sequence. This is the one piece of code we
925 * will execute even on SMP machines. In order to deal with BIOS
926 * bugs we support real mode APM BIOS power off calls. We also make
927 * the SMP call on CPU0 as some systems will only honour this call
928 * on their first cpu.
929 */
930
931 static void apm_power_off(void)
932 {
933 unsigned char po_bios_call[] = {
934 0xb8, 0x00, 0x10, /* movw $0x1000,ax */
935 0x8e, 0xd0, /* movw ax,ss */
936 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
937 0xb8, 0x07, 0x53, /* movw $0x5307,ax */
938 0xbb, 0x01, 0x00, /* movw $0x0001,bx */
939 0xb9, 0x03, 0x00, /* movw $0x0003,cx */
940 0xcd, 0x15 /* int $0x15 */
941 };
942
943 /* Some bioses don't like being called from CPU != 0 */
944 if (apm_info.realmode_power_off) {
945 (void)apm_save_cpus();
946 machine_real_restart(po_bios_call, sizeof(po_bios_call));
947 } else {
948 (void)set_system_power_state(APM_STATE_OFF);
949 }
950 }
951
952 #ifdef CONFIG_APM_DO_ENABLE
953
954 /**
955 * apm_enable_power_management - enable BIOS APM power management
956 * @enable: enable yes/no
957 *
958 * Enable or disable the APM BIOS power services.
959 */
960
961 static int apm_enable_power_management(int enable)
962 {
963 u32 eax;
964
965 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
966 return APM_NOT_ENGAGED;
967 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
968 enable, &eax))
969 return (eax >> 8) & 0xff;
970 if (enable)
971 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
972 else
973 apm_info.bios.flags |= APM_BIOS_DISABLED;
974 return APM_SUCCESS;
975 }
976 #endif
977
978 /**
979 * apm_get_power_status - get current power state
980 * @status: returned status
981 * @bat: battery info
982 * @life: estimated life
983 *
984 * Obtain the current power status from the APM BIOS. We return a
985 * status which gives the rough battery status, and current power
986 * source. The bat value returned give an estimate as a percentage
987 * of life and a status value for the battery. The estimated life
988 * if reported is a lifetime in secodnds/minutes at current powwer
989 * consumption.
990 */
991
992 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
993 {
994 u32 eax;
995 u32 ebx;
996 u32 ecx;
997 u32 edx;
998 u32 dummy;
999
1000 if (apm_info.get_power_status_broken)
1001 return APM_32_UNSUPPORTED;
1002 if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0,
1003 &eax, &ebx, &ecx, &edx, &dummy))
1004 return (eax >> 8) & 0xff;
1005 *status = ebx;
1006 *bat = ecx;
1007 if (apm_info.get_power_status_swabinminutes) {
1008 *life = swab16((u16)edx);
1009 *life |= 0x8000;
1010 } else
1011 *life = edx;
1012 return APM_SUCCESS;
1013 }
1014
1015 #if 0
1016 static int apm_get_battery_status(u_short which, u_short *status,
1017 u_short *bat, u_short *life, u_short *nbat)
1018 {
1019 u32 eax;
1020 u32 ebx;
1021 u32 ecx;
1022 u32 edx;
1023 u32 esi;
1024
1025 if (apm_info.connection_version < 0x0102) {
1026 /* pretend we only have one battery. */
1027 if (which != 1)
1028 return APM_BAD_DEVICE;
1029 *nbat = 1;
1030 return apm_get_power_status(status, bat, life);
1031 }
1032
1033 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1034 &ebx, &ecx, &edx, &esi))
1035 return (eax >> 8) & 0xff;
1036 *status = ebx;
1037 *bat = ecx;
1038 *life = edx;
1039 *nbat = esi;
1040 return APM_SUCCESS;
1041 }
1042 #endif
1043
1044 /**
1045 * apm_engage_power_management - enable PM on a device
1046 * @device: identity of device
1047 * @enable: on/off
1048 *
1049 * Activate or deactive power management on either a specific device
1050 * or the entire system (%APM_DEVICE_ALL).
1051 */
1052
1053 static int apm_engage_power_management(u_short device, int enable)
1054 {
1055 u32 eax;
1056
1057 if ((enable == 0) && (device == APM_DEVICE_ALL)
1058 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1059 return APM_DISABLED;
1060 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax))
1061 return (eax >> 8) & 0xff;
1062 if (device == APM_DEVICE_ALL) {
1063 if (enable)
1064 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1065 else
1066 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1067 }
1068 return APM_SUCCESS;
1069 }
1070
1071 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1072
1073 /**
1074 * apm_console_blank - blank the display
1075 * @blank: on/off
1076 *
1077 * Attempt to blank the console, firstly by blanking just video device
1078 * zero, and if that fails (some BIOSes don't support it) then it blanks
1079 * all video devices. Typically the BIOS will do laptop backlight and
1080 * monitor powerdown for us.
1081 */
1082
1083 static int apm_console_blank(int blank)
1084 {
1085 int error = APM_NOT_ENGAGED; /* silence gcc */
1086 int i;
1087 u_short state;
1088 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1089
1090 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1091
1092 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1093 error = set_power_state(dev[i], state);
1094
1095 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1096 return 1;
1097
1098 if (error == APM_NOT_ENGAGED)
1099 break;
1100 }
1101
1102 if (error == APM_NOT_ENGAGED) {
1103 static int tried;
1104 int eng_error;
1105 if (tried++ == 0) {
1106 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1107 if (eng_error) {
1108 apm_error("set display", error);
1109 apm_error("engage interface", eng_error);
1110 return 0;
1111 } else
1112 return apm_console_blank(blank);
1113 }
1114 }
1115 apm_error("set display", error);
1116 return 0;
1117 }
1118 #endif
1119
1120 static int queue_empty(struct apm_user *as)
1121 {
1122 return as->event_head == as->event_tail;
1123 }
1124
1125 static apm_event_t get_queued_event(struct apm_user *as)
1126 {
1127 if (++as->event_tail >= APM_MAX_EVENTS)
1128 as->event_tail = 0;
1129 return as->events[as->event_tail];
1130 }
1131
1132 static void queue_event(apm_event_t event, struct apm_user *sender)
1133 {
1134 struct apm_user *as;
1135
1136 spin_lock(&user_list_lock);
1137 if (user_list == NULL)
1138 goto out;
1139 for (as = user_list; as != NULL; as = as->next) {
1140 if ((as == sender) || (!as->reader))
1141 continue;
1142 if (++as->event_head >= APM_MAX_EVENTS)
1143 as->event_head = 0;
1144
1145 if (as->event_head == as->event_tail) {
1146 static int notified;
1147
1148 if (notified++ == 0)
1149 printk(KERN_ERR "apm: an event queue overflowed\n");
1150 if (++as->event_tail >= APM_MAX_EVENTS)
1151 as->event_tail = 0;
1152 }
1153 as->events[as->event_head] = event;
1154 if (!as->suser || !as->writer)
1155 continue;
1156 switch (event) {
1157 case APM_SYS_SUSPEND:
1158 case APM_USER_SUSPEND:
1159 as->suspends_pending++;
1160 suspends_pending++;
1161 break;
1162
1163 case APM_SYS_STANDBY:
1164 case APM_USER_STANDBY:
1165 as->standbys_pending++;
1166 standbys_pending++;
1167 break;
1168 }
1169 }
1170 wake_up_interruptible(&apm_waitqueue);
1171 out:
1172 spin_unlock(&user_list_lock);
1173 }
1174
1175 static void reinit_timer(void)
1176 {
1177 #ifdef INIT_TIMER_AFTER_SUSPEND
1178 unsigned long flags;
1179
1180 spin_lock_irqsave(&i8253_lock, flags);
1181 /* set the clock to HZ */
1182 outb_pit(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1183 udelay(10);
1184 outb_pit(LATCH & 0xff, PIT_CH0); /* LSB */
1185 udelay(10);
1186 outb_pit(LATCH >> 8, PIT_CH0); /* MSB */
1187 udelay(10);
1188 spin_unlock_irqrestore(&i8253_lock, flags);
1189 #endif
1190 }
1191
1192 static int suspend(int vetoable)
1193 {
1194 int err;
1195 struct apm_user *as;
1196
1197 device_suspend(PMSG_SUSPEND);
1198 local_irq_disable();
1199 device_power_down(PMSG_SUSPEND);
1200
1201 local_irq_enable();
1202
1203 save_processor_state();
1204 err = set_system_power_state(APM_STATE_SUSPEND);
1205 ignore_normal_resume = 1;
1206 restore_processor_state();
1207
1208 local_irq_disable();
1209 reinit_timer();
1210
1211 if (err == APM_NO_ERROR)
1212 err = APM_SUCCESS;
1213 if (err != APM_SUCCESS)
1214 apm_error("suspend", err);
1215 err = (err == APM_SUCCESS) ? 0 : -EIO;
1216 device_power_up(PMSG_RESUME);
1217 local_irq_enable();
1218 device_resume(PMSG_RESUME);
1219 queue_event(APM_NORMAL_RESUME, NULL);
1220 spin_lock(&user_list_lock);
1221 for (as = user_list; as != NULL; as = as->next) {
1222 as->suspend_wait = 0;
1223 as->suspend_result = err;
1224 }
1225 spin_unlock(&user_list_lock);
1226 wake_up_interruptible(&apm_suspend_waitqueue);
1227 return err;
1228 }
1229
1230 static void standby(void)
1231 {
1232 int err;
1233
1234 local_irq_disable();
1235 device_power_down(PMSG_SUSPEND);
1236 local_irq_enable();
1237
1238 err = set_system_power_state(APM_STATE_STANDBY);
1239 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1240 apm_error("standby", err);
1241
1242 local_irq_disable();
1243 device_power_up(PMSG_RESUME);
1244 local_irq_enable();
1245 }
1246
1247 static apm_event_t get_event(void)
1248 {
1249 int error;
1250 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1251 apm_eventinfo_t info;
1252
1253 static int notified;
1254
1255 /* we don't use the eventinfo */
1256 error = apm_get_event(&event, &info);
1257 if (error == APM_SUCCESS)
1258 return event;
1259
1260 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1261 apm_error("get_event", error);
1262
1263 return 0;
1264 }
1265
1266 static void check_events(void)
1267 {
1268 apm_event_t event;
1269 static unsigned long last_resume;
1270 static int ignore_bounce;
1271
1272 while ((event = get_event()) != 0) {
1273 if (debug) {
1274 if (event <= NR_APM_EVENT_NAME)
1275 printk(KERN_DEBUG "apm: received %s notify\n",
1276 apm_event_name[event - 1]);
1277 else
1278 printk(KERN_DEBUG "apm: received unknown "
1279 "event 0x%02x\n", event);
1280 }
1281 if (ignore_bounce
1282 && (time_after(jiffies, last_resume + bounce_interval)))
1283 ignore_bounce = 0;
1284
1285 switch (event) {
1286 case APM_SYS_STANDBY:
1287 case APM_USER_STANDBY:
1288 queue_event(event, NULL);
1289 if (standbys_pending <= 0)
1290 standby();
1291 break;
1292
1293 case APM_USER_SUSPEND:
1294 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1295 if (apm_info.connection_version > 0x100)
1296 set_system_power_state(APM_STATE_REJECT);
1297 break;
1298 #endif
1299 case APM_SYS_SUSPEND:
1300 if (ignore_bounce) {
1301 if (apm_info.connection_version > 0x100)
1302 set_system_power_state(APM_STATE_REJECT);
1303 break;
1304 }
1305 /*
1306 * If we are already processing a SUSPEND,
1307 * then further SUSPEND events from the BIOS
1308 * will be ignored. We also return here to
1309 * cope with the fact that the Thinkpads keep
1310 * sending a SUSPEND event until something else
1311 * happens!
1312 */
1313 if (ignore_sys_suspend)
1314 return;
1315 ignore_sys_suspend = 1;
1316 queue_event(event, NULL);
1317 if (suspends_pending <= 0)
1318 (void) suspend(1);
1319 break;
1320
1321 case APM_NORMAL_RESUME:
1322 case APM_CRITICAL_RESUME:
1323 case APM_STANDBY_RESUME:
1324 ignore_sys_suspend = 0;
1325 last_resume = jiffies;
1326 ignore_bounce = 1;
1327 if ((event != APM_NORMAL_RESUME)
1328 || (ignore_normal_resume == 0)) {
1329 device_resume(PMSG_RESUME);
1330 queue_event(event, NULL);
1331 }
1332 ignore_normal_resume = 0;
1333 break;
1334
1335 case APM_CAPABILITY_CHANGE:
1336 case APM_LOW_BATTERY:
1337 case APM_POWER_STATUS_CHANGE:
1338 queue_event(event, NULL);
1339 /* If needed, notify drivers here */
1340 break;
1341
1342 case APM_UPDATE_TIME:
1343 break;
1344
1345 case APM_CRITICAL_SUSPEND:
1346 /*
1347 * We are not allowed to reject a critical suspend.
1348 */
1349 (void)suspend(0);
1350 break;
1351 }
1352 }
1353 }
1354
1355 static void apm_event_handler(void)
1356 {
1357 static int pending_count = 4;
1358 int err;
1359
1360 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1361 if ((apm_info.connection_version > 0x100) &&
1362 (pending_count-- <= 0)) {
1363 pending_count = 4;
1364 if (debug)
1365 printk(KERN_DEBUG "apm: setting state busy\n");
1366 err = set_system_power_state(APM_STATE_BUSY);
1367 if (err)
1368 apm_error("busy", err);
1369 }
1370 } else
1371 pending_count = 4;
1372 check_events();
1373 }
1374
1375 /*
1376 * This is the APM thread main loop.
1377 */
1378
1379 static void apm_mainloop(void)
1380 {
1381 DECLARE_WAITQUEUE(wait, current);
1382
1383 add_wait_queue(&apm_waitqueue, &wait);
1384 set_current_state(TASK_INTERRUPTIBLE);
1385 for (;;) {
1386 schedule_timeout(APM_CHECK_TIMEOUT);
1387 if (kthread_should_stop())
1388 break;
1389 /*
1390 * Ok, check all events, check for idle (and mark us sleeping
1391 * so as not to count towards the load average)..
1392 */
1393 set_current_state(TASK_INTERRUPTIBLE);
1394 apm_event_handler();
1395 }
1396 remove_wait_queue(&apm_waitqueue, &wait);
1397 }
1398
1399 static int check_apm_user(struct apm_user *as, const char *func)
1400 {
1401 if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1402 printk(KERN_ERR "apm: %s passed bad filp\n", func);
1403 return 1;
1404 }
1405 return 0;
1406 }
1407
1408 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1409 {
1410 struct apm_user *as;
1411 int i;
1412 apm_event_t event;
1413
1414 as = fp->private_data;
1415 if (check_apm_user(as, "read"))
1416 return -EIO;
1417 if ((int)count < sizeof(apm_event_t))
1418 return -EINVAL;
1419 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1420 return -EAGAIN;
1421 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1422 i = count;
1423 while ((i >= sizeof(event)) && !queue_empty(as)) {
1424 event = get_queued_event(as);
1425 if (copy_to_user(buf, &event, sizeof(event))) {
1426 if (i < count)
1427 break;
1428 return -EFAULT;
1429 }
1430 switch (event) {
1431 case APM_SYS_SUSPEND:
1432 case APM_USER_SUSPEND:
1433 as->suspends_read++;
1434 break;
1435
1436 case APM_SYS_STANDBY:
1437 case APM_USER_STANDBY:
1438 as->standbys_read++;
1439 break;
1440 }
1441 buf += sizeof(event);
1442 i -= sizeof(event);
1443 }
1444 if (i < count)
1445 return count - i;
1446 if (signal_pending(current))
1447 return -ERESTARTSYS;
1448 return 0;
1449 }
1450
1451 static unsigned int do_poll(struct file *fp, poll_table *wait)
1452 {
1453 struct apm_user *as;
1454
1455 as = fp->private_data;
1456 if (check_apm_user(as, "poll"))
1457 return 0;
1458 poll_wait(fp, &apm_waitqueue, wait);
1459 if (!queue_empty(as))
1460 return POLLIN | POLLRDNORM;
1461 return 0;
1462 }
1463
1464 static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1465 {
1466 struct apm_user *as;
1467 int ret;
1468
1469 as = filp->private_data;
1470 if (check_apm_user(as, "ioctl"))
1471 return -EIO;
1472 if (!as->suser || !as->writer)
1473 return -EPERM;
1474 switch (cmd) {
1475 case APM_IOC_STANDBY:
1476 lock_kernel();
1477 if (as->standbys_read > 0) {
1478 as->standbys_read--;
1479 as->standbys_pending--;
1480 standbys_pending--;
1481 } else
1482 queue_event(APM_USER_STANDBY, as);
1483 if (standbys_pending <= 0)
1484 standby();
1485 unlock_kernel();
1486 break;
1487 case APM_IOC_SUSPEND:
1488 lock_kernel();
1489 if (as->suspends_read > 0) {
1490 as->suspends_read--;
1491 as->suspends_pending--;
1492 suspends_pending--;
1493 } else
1494 queue_event(APM_USER_SUSPEND, as);
1495 if (suspends_pending <= 0) {
1496 ret = suspend(1);
1497 } else {
1498 as->suspend_wait = 1;
1499 wait_event_interruptible(apm_suspend_waitqueue,
1500 as->suspend_wait == 0);
1501 ret = as->suspend_result;
1502 }
1503 unlock_kernel();
1504 return ret;
1505 default:
1506 return -ENOTTY;
1507 }
1508 return 0;
1509 }
1510
1511 static int do_release(struct inode *inode, struct file *filp)
1512 {
1513 struct apm_user *as;
1514
1515 as = filp->private_data;
1516 if (check_apm_user(as, "release"))
1517 return 0;
1518 filp->private_data = NULL;
1519 if (as->standbys_pending > 0) {
1520 standbys_pending -= as->standbys_pending;
1521 if (standbys_pending <= 0)
1522 standby();
1523 }
1524 if (as->suspends_pending > 0) {
1525 suspends_pending -= as->suspends_pending;
1526 if (suspends_pending <= 0)
1527 (void) suspend(1);
1528 }
1529 spin_lock(&user_list_lock);
1530 if (user_list == as)
1531 user_list = as->next;
1532 else {
1533 struct apm_user *as1;
1534
1535 for (as1 = user_list;
1536 (as1 != NULL) && (as1->next != as);
1537 as1 = as1->next)
1538 ;
1539 if (as1 == NULL)
1540 printk(KERN_ERR "apm: filp not in user list\n");
1541 else
1542 as1->next = as->next;
1543 }
1544 spin_unlock(&user_list_lock);
1545 kfree(as);
1546 return 0;
1547 }
1548
1549 static int do_open(struct inode *inode, struct file *filp)
1550 {
1551 struct apm_user *as;
1552
1553 lock_kernel();
1554 as = kmalloc(sizeof(*as), GFP_KERNEL);
1555 if (as == NULL) {
1556 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1557 sizeof(*as));
1558 unlock_kernel();
1559 return -ENOMEM;
1560 }
1561 as->magic = APM_BIOS_MAGIC;
1562 as->event_tail = as->event_head = 0;
1563 as->suspends_pending = as->standbys_pending = 0;
1564 as->suspends_read = as->standbys_read = 0;
1565 /*
1566 * XXX - this is a tiny bit broken, when we consider BSD
1567 * process accounting. If the device is opened by root, we
1568 * instantly flag that we used superuser privs. Who knows,
1569 * we might close the device immediately without doing a
1570 * privileged operation -- cevans
1571 */
1572 as->suser = capable(CAP_SYS_ADMIN);
1573 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1574 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1575 spin_lock(&user_list_lock);
1576 as->next = user_list;
1577 user_list = as;
1578 spin_unlock(&user_list_lock);
1579 filp->private_data = as;
1580 unlock_kernel();
1581 return 0;
1582 }
1583
1584 static int proc_apm_show(struct seq_file *m, void *v)
1585 {
1586 unsigned short bx;
1587 unsigned short cx;
1588 unsigned short dx;
1589 int error;
1590 unsigned short ac_line_status = 0xff;
1591 unsigned short battery_status = 0xff;
1592 unsigned short battery_flag = 0xff;
1593 int percentage = -1;
1594 int time_units = -1;
1595 char *units = "?";
1596
1597 if ((num_online_cpus() == 1) &&
1598 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1599 ac_line_status = (bx >> 8) & 0xff;
1600 battery_status = bx & 0xff;
1601 if ((cx & 0xff) != 0xff)
1602 percentage = cx & 0xff;
1603
1604 if (apm_info.connection_version > 0x100) {
1605 battery_flag = (cx >> 8) & 0xff;
1606 if (dx != 0xffff) {
1607 units = (dx & 0x8000) ? "min" : "sec";
1608 time_units = dx & 0x7fff;
1609 }
1610 }
1611 }
1612 /* Arguments, with symbols from linux/apm_bios.h. Information is
1613 from the Get Power Status (0x0a) call unless otherwise noted.
1614
1615 0) Linux driver version (this will change if format changes)
1616 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1617 2) APM flags from APM Installation Check (0x00):
1618 bit 0: APM_16_BIT_SUPPORT
1619 bit 1: APM_32_BIT_SUPPORT
1620 bit 2: APM_IDLE_SLOWS_CLOCK
1621 bit 3: APM_BIOS_DISABLED
1622 bit 4: APM_BIOS_DISENGAGED
1623 3) AC line status
1624 0x00: Off-line
1625 0x01: On-line
1626 0x02: On backup power (BIOS >= 1.1 only)
1627 0xff: Unknown
1628 4) Battery status
1629 0x00: High
1630 0x01: Low
1631 0x02: Critical
1632 0x03: Charging
1633 0x04: Selected battery not present (BIOS >= 1.2 only)
1634 0xff: Unknown
1635 5) Battery flag
1636 bit 0: High
1637 bit 1: Low
1638 bit 2: Critical
1639 bit 3: Charging
1640 bit 7: No system battery
1641 0xff: Unknown
1642 6) Remaining battery life (percentage of charge):
1643 0-100: valid
1644 -1: Unknown
1645 7) Remaining battery life (time units):
1646 Number of remaining minutes or seconds
1647 -1: Unknown
1648 8) min = minutes; sec = seconds */
1649
1650 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1651 driver_version,
1652 (apm_info.bios.version >> 8) & 0xff,
1653 apm_info.bios.version & 0xff,
1654 apm_info.bios.flags,
1655 ac_line_status,
1656 battery_status,
1657 battery_flag,
1658 percentage,
1659 time_units,
1660 units);
1661 return 0;
1662 }
1663
1664 static int proc_apm_open(struct inode *inode, struct file *file)
1665 {
1666 return single_open(file, proc_apm_show, NULL);
1667 }
1668
1669 static const struct file_operations apm_file_ops = {
1670 .owner = THIS_MODULE,
1671 .open = proc_apm_open,
1672 .read = seq_read,
1673 .llseek = seq_lseek,
1674 .release = single_release,
1675 };
1676
1677 static int apm(void *unused)
1678 {
1679 unsigned short bx;
1680 unsigned short cx;
1681 unsigned short dx;
1682 int error;
1683 char *power_stat;
1684 char *bat_stat;
1685
1686 #ifdef CONFIG_SMP
1687 /* 2002/08/01 - WT
1688 * This is to avoid random crashes at boot time during initialization
1689 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1690 * Some bioses don't like being called from CPU != 0.
1691 * Method suggested by Ingo Molnar.
1692 */
1693 set_cpus_allowed(current, cpumask_of_cpu(0));
1694 BUG_ON(smp_processor_id() != 0);
1695 #endif
1696
1697 if (apm_info.connection_version == 0) {
1698 apm_info.connection_version = apm_info.bios.version;
1699 if (apm_info.connection_version > 0x100) {
1700 /*
1701 * We only support BIOSs up to version 1.2
1702 */
1703 if (apm_info.connection_version > 0x0102)
1704 apm_info.connection_version = 0x0102;
1705 error = apm_driver_version(&apm_info.connection_version);
1706 if (error != APM_SUCCESS) {
1707 apm_error("driver version", error);
1708 /* Fall back to an APM 1.0 connection. */
1709 apm_info.connection_version = 0x100;
1710 }
1711 }
1712 }
1713
1714 if (debug)
1715 printk(KERN_INFO "apm: Connection version %d.%d\n",
1716 (apm_info.connection_version >> 8) & 0xff,
1717 apm_info.connection_version & 0xff);
1718
1719 #ifdef CONFIG_APM_DO_ENABLE
1720 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1721 /*
1722 * This call causes my NEC UltraLite Versa 33/C to hang if it
1723 * is booted with PM disabled but not in the docking station.
1724 * Unfortunate ...
1725 */
1726 error = apm_enable_power_management(1);
1727 if (error) {
1728 apm_error("enable power management", error);
1729 return -1;
1730 }
1731 }
1732 #endif
1733
1734 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1735 && (apm_info.connection_version > 0x0100)) {
1736 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1737 if (error) {
1738 apm_error("engage power management", error);
1739 return -1;
1740 }
1741 }
1742
1743 if (debug && (num_online_cpus() == 1 || smp)) {
1744 error = apm_get_power_status(&bx, &cx, &dx);
1745 if (error)
1746 printk(KERN_INFO "apm: power status not available\n");
1747 else {
1748 switch ((bx >> 8) & 0xff) {
1749 case 0:
1750 power_stat = "off line";
1751 break;
1752 case 1:
1753 power_stat = "on line";
1754 break;
1755 case 2:
1756 power_stat = "on backup power";
1757 break;
1758 default:
1759 power_stat = "unknown";
1760 break;
1761 }
1762 switch (bx & 0xff) {
1763 case 0:
1764 bat_stat = "high";
1765 break;
1766 case 1:
1767 bat_stat = "low";
1768 break;
1769 case 2:
1770 bat_stat = "critical";
1771 break;
1772 case 3:
1773 bat_stat = "charging";
1774 break;
1775 default:
1776 bat_stat = "unknown";
1777 break;
1778 }
1779 printk(KERN_INFO
1780 "apm: AC %s, battery status %s, battery life ",
1781 power_stat, bat_stat);
1782 if ((cx & 0xff) == 0xff)
1783 printk("unknown\n");
1784 else
1785 printk("%d%%\n", cx & 0xff);
1786 if (apm_info.connection_version > 0x100) {
1787 printk(KERN_INFO
1788 "apm: battery flag 0x%02x, battery life ",
1789 (cx >> 8) & 0xff);
1790 if (dx == 0xffff)
1791 printk("unknown\n");
1792 else
1793 printk("%d %s\n", dx & 0x7fff,
1794 (dx & 0x8000) ?
1795 "minutes" : "seconds");
1796 }
1797 }
1798 }
1799
1800 /* Install our power off handler.. */
1801 if (power_off)
1802 pm_power_off = apm_power_off;
1803
1804 if (num_online_cpus() == 1 || smp) {
1805 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1806 console_blank_hook = apm_console_blank;
1807 #endif
1808 apm_mainloop();
1809 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1810 console_blank_hook = NULL;
1811 #endif
1812 }
1813
1814 return 0;
1815 }
1816
1817 #ifndef MODULE
1818 static int __init apm_setup(char *str)
1819 {
1820 int invert;
1821
1822 while ((str != NULL) && (*str != '\0')) {
1823 if (strncmp(str, "off", 3) == 0)
1824 apm_disabled = 1;
1825 if (strncmp(str, "on", 2) == 0)
1826 apm_disabled = 0;
1827 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1828 (strncmp(str, "bounce_interval=", 16) == 0))
1829 bounce_interval = simple_strtol(str + 16, NULL, 0);
1830 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1831 (strncmp(str, "idle_threshold=", 15) == 0))
1832 idle_threshold = simple_strtol(str + 15, NULL, 0);
1833 if ((strncmp(str, "idle-period=", 12) == 0) ||
1834 (strncmp(str, "idle_period=", 12) == 0))
1835 idle_period = simple_strtol(str + 12, NULL, 0);
1836 invert = (strncmp(str, "no-", 3) == 0) ||
1837 (strncmp(str, "no_", 3) == 0);
1838 if (invert)
1839 str += 3;
1840 if (strncmp(str, "debug", 5) == 0)
1841 debug = !invert;
1842 if ((strncmp(str, "power-off", 9) == 0) ||
1843 (strncmp(str, "power_off", 9) == 0))
1844 power_off = !invert;
1845 if (strncmp(str, "smp", 3) == 0) {
1846 smp = !invert;
1847 idle_threshold = 100;
1848 }
1849 if ((strncmp(str, "allow-ints", 10) == 0) ||
1850 (strncmp(str, "allow_ints", 10) == 0))
1851 apm_info.allow_ints = !invert;
1852 if ((strncmp(str, "broken-psr", 10) == 0) ||
1853 (strncmp(str, "broken_psr", 10) == 0))
1854 apm_info.get_power_status_broken = !invert;
1855 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1856 (strncmp(str, "realmode_power_off", 18) == 0))
1857 apm_info.realmode_power_off = !invert;
1858 str = strchr(str, ',');
1859 if (str != NULL)
1860 str += strspn(str, ", \t");
1861 }
1862 return 1;
1863 }
1864
1865 __setup("apm=", apm_setup);
1866 #endif
1867
1868 static const struct file_operations apm_bios_fops = {
1869 .owner = THIS_MODULE,
1870 .read = do_read,
1871 .poll = do_poll,
1872 .unlocked_ioctl = do_ioctl,
1873 .open = do_open,
1874 .release = do_release,
1875 };
1876
1877 static struct miscdevice apm_device = {
1878 APM_MINOR_DEV,
1879 "apm_bios",
1880 &apm_bios_fops
1881 };
1882
1883
1884 /* Simple "print if true" callback */
1885 static int __init print_if_true(const struct dmi_system_id *d)
1886 {
1887 printk("%s\n", d->ident);
1888 return 0;
1889 }
1890
1891 /*
1892 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1893 * disabled before the suspend. Linux used to get terribly confused by that.
1894 */
1895 static int __init broken_ps2_resume(const struct dmi_system_id *d)
1896 {
1897 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1898 "workaround hopefully not needed.\n", d->ident);
1899 return 0;
1900 }
1901
1902 /* Some bioses have a broken protected mode poweroff and need to use realmode */
1903 static int __init set_realmode_power_off(const struct dmi_system_id *d)
1904 {
1905 if (apm_info.realmode_power_off == 0) {
1906 apm_info.realmode_power_off = 1;
1907 printk(KERN_INFO "%s bios detected. "
1908 "Using realmode poweroff only.\n", d->ident);
1909 }
1910 return 0;
1911 }
1912
1913 /* Some laptops require interrupts to be enabled during APM calls */
1914 static int __init set_apm_ints(const struct dmi_system_id *d)
1915 {
1916 if (apm_info.allow_ints == 0) {
1917 apm_info.allow_ints = 1;
1918 printk(KERN_INFO "%s machine detected. "
1919 "Enabling interrupts during APM calls.\n", d->ident);
1920 }
1921 return 0;
1922 }
1923
1924 /* Some APM bioses corrupt memory or just plain do not work */
1925 static int __init apm_is_horked(const struct dmi_system_id *d)
1926 {
1927 if (apm_info.disabled == 0) {
1928 apm_info.disabled = 1;
1929 printk(KERN_INFO "%s machine detected. "
1930 "Disabling APM.\n", d->ident);
1931 }
1932 return 0;
1933 }
1934
1935 static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1936 {
1937 if (apm_info.disabled == 0) {
1938 apm_info.disabled = 1;
1939 printk(KERN_INFO "%s machine detected. "
1940 "Disabling APM.\n", d->ident);
1941 printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n");
1942 printk(KERN_INFO "download from support.intel.com \n");
1943 }
1944 return 0;
1945 }
1946
1947 /* Some APM bioses hang on APM idle calls */
1948 static int __init apm_likes_to_melt(const struct dmi_system_id *d)
1949 {
1950 if (apm_info.forbid_idle == 0) {
1951 apm_info.forbid_idle = 1;
1952 printk(KERN_INFO "%s machine detected. "
1953 "Disabling APM idle calls.\n", d->ident);
1954 }
1955 return 0;
1956 }
1957
1958 /*
1959 * Check for clue free BIOS implementations who use
1960 * the following QA technique
1961 *
1962 * [ Write BIOS Code ]<------
1963 * | ^
1964 * < Does it Compile >----N--
1965 * |Y ^
1966 * < Does it Boot Win98 >-N--
1967 * |Y
1968 * [Ship It]
1969 *
1970 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
1971 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
1972 */
1973 static int __init broken_apm_power(const struct dmi_system_id *d)
1974 {
1975 apm_info.get_power_status_broken = 1;
1976 printk(KERN_WARNING "BIOS strings suggest APM bugs, "
1977 "disabling power status reporting.\n");
1978 return 0;
1979 }
1980
1981 /*
1982 * This bios swaps the APM minute reporting bytes over (Many sony laptops
1983 * have this problem).
1984 */
1985 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
1986 {
1987 apm_info.get_power_status_swabinminutes = 1;
1988 printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
1989 "in minutes and wrong byte order.\n");
1990 return 0;
1991 }
1992
1993 static struct dmi_system_id __initdata apm_dmi_table[] = {
1994 {
1995 print_if_true,
1996 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
1997 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
1998 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
1999 },
2000 { /* Handle problems with APM on the C600 */
2001 broken_ps2_resume, "Dell Latitude C600",
2002 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2003 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2004 },
2005 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2006 set_apm_ints, "Dell Latitude",
2007 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2008 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2009 },
2010 { /* APM crashes */
2011 apm_is_horked, "Dell Inspiron 2500",
2012 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2013 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2014 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2015 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2016 },
2017 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2018 set_apm_ints, "Dell Inspiron", {
2019 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2020 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2021 },
2022 { /* Handle problems with APM on Inspiron 5000e */
2023 broken_apm_power, "Dell Inspiron 5000e",
2024 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2025 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2026 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2027 },
2028 { /* Handle problems with APM on Inspiron 2500 */
2029 broken_apm_power, "Dell Inspiron 2500",
2030 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2031 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2032 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2033 },
2034 { /* APM crashes */
2035 apm_is_horked, "Dell Dimension 4100",
2036 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2037 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2038 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2039 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2040 },
2041 { /* Allow interrupts during suspend on Compaq Laptops*/
2042 set_apm_ints, "Compaq 12XL125",
2043 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2044 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2045 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2046 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2047 },
2048 { /* Allow interrupts during APM or the clock goes slow */
2049 set_apm_ints, "ASUSTeK",
2050 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2051 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2052 },
2053 { /* APM blows on shutdown */
2054 apm_is_horked, "ABIT KX7-333[R]",
2055 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2056 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2057 },
2058 { /* APM crashes */
2059 apm_is_horked, "Trigem Delhi3",
2060 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2061 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2062 },
2063 { /* APM crashes */
2064 apm_is_horked, "Fujitsu-Siemens",
2065 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2066 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2067 },
2068 { /* APM crashes */
2069 apm_is_horked_d850md, "Intel D850MD",
2070 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2071 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2072 },
2073 { /* APM crashes */
2074 apm_is_horked, "Intel D810EMO",
2075 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2076 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2077 },
2078 { /* APM crashes */
2079 apm_is_horked, "Dell XPS-Z",
2080 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2081 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2082 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2083 },
2084 { /* APM crashes */
2085 apm_is_horked, "Sharp PC-PJ/AX",
2086 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2087 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2088 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2089 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2090 },
2091 { /* APM crashes */
2092 apm_is_horked, "Dell Inspiron 2500",
2093 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2094 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2095 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2096 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2097 },
2098 { /* APM idle hangs */
2099 apm_likes_to_melt, "Jabil AMD",
2100 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2101 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2102 },
2103 { /* APM idle hangs */
2104 apm_likes_to_melt, "AMI Bios",
2105 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2106 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2107 },
2108 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2109 swab_apm_power_in_minutes, "Sony VAIO",
2110 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2111 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2112 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2113 },
2114 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2115 swab_apm_power_in_minutes, "Sony VAIO",
2116 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2117 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2118 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2119 },
2120 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2121 swab_apm_power_in_minutes, "Sony VAIO",
2122 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2123 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2124 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2125 },
2126 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2127 swab_apm_power_in_minutes, "Sony VAIO",
2128 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2129 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2130 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2131 },
2132 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2133 swab_apm_power_in_minutes, "Sony VAIO",
2134 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2135 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2136 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2137 },
2138 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2139 swab_apm_power_in_minutes, "Sony VAIO",
2140 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2141 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2142 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2143 },
2144 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2145 swab_apm_power_in_minutes, "Sony VAIO",
2146 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2147 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2148 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2149 },
2150 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2151 swab_apm_power_in_minutes, "Sony VAIO",
2152 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2153 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2154 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2155 },
2156 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2157 swab_apm_power_in_minutes, "Sony VAIO",
2158 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2159 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2160 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2161 },
2162 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2163 swab_apm_power_in_minutes, "Sony VAIO",
2164 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2165 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2166 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2167 },
2168
2169 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2170 swab_apm_power_in_minutes, "Sony VAIO",
2171 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2172 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2173 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2174 },
2175 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2176 swab_apm_power_in_minutes, "Sony VAIO",
2177 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2178 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2179 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2180 },
2181 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2182 swab_apm_power_in_minutes, "Sony VAIO",
2183 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2184 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2185 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2186 },
2187 { /* broken PM poweroff bios */
2188 set_realmode_power_off, "Award Software v4.60 PGMA",
2189 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2190 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2191 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2192 },
2193
2194 /* Generic per vendor APM settings */
2195
2196 { /* Allow interrupts during suspend on IBM laptops */
2197 set_apm_ints, "IBM",
2198 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2199 },
2200
2201 { }
2202 };
2203
2204 /*
2205 * Just start the APM thread. We do NOT want to do APM BIOS
2206 * calls from anything but the APM thread, if for no other reason
2207 * than the fact that we don't trust the APM BIOS. This way,
2208 * most common APM BIOS problems that lead to protection errors
2209 * etc will have at least some level of being contained...
2210 *
2211 * In short, if something bad happens, at least we have a choice
2212 * of just killing the apm thread..
2213 */
2214 static int __init apm_init(void)
2215 {
2216 struct desc_struct *gdt;
2217 int err;
2218
2219 dmi_check_system(apm_dmi_table);
2220
2221 if (apm_info.bios.version == 0 || paravirt_enabled()) {
2222 printk(KERN_INFO "apm: BIOS not found.\n");
2223 return -ENODEV;
2224 }
2225 printk(KERN_INFO
2226 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2227 ((apm_info.bios.version >> 8) & 0xff),
2228 (apm_info.bios.version & 0xff),
2229 apm_info.bios.flags,
2230 driver_version);
2231 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2232 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2233 return -ENODEV;
2234 }
2235
2236 if (allow_ints)
2237 apm_info.allow_ints = 1;
2238 if (broken_psr)
2239 apm_info.get_power_status_broken = 1;
2240 if (realmode_power_off)
2241 apm_info.realmode_power_off = 1;
2242 /* User can override, but default is to trust DMI */
2243 if (apm_disabled != -1)
2244 apm_info.disabled = apm_disabled;
2245
2246 /*
2247 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2248 * but is reportedly a 1.0 BIOS.
2249 */
2250 if (apm_info.bios.version == 0x001)
2251 apm_info.bios.version = 0x100;
2252
2253 /* BIOS < 1.2 doesn't set cseg_16_len */
2254 if (apm_info.bios.version < 0x102)
2255 apm_info.bios.cseg_16_len = 0; /* 64k */
2256
2257 if (debug) {
2258 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2259 apm_info.bios.cseg, apm_info.bios.offset,
2260 apm_info.bios.cseg_16, apm_info.bios.dseg);
2261 if (apm_info.bios.version > 0x100)
2262 printk(" cseg len %x, dseg len %x",
2263 apm_info.bios.cseg_len,
2264 apm_info.bios.dseg_len);
2265 if (apm_info.bios.version > 0x101)
2266 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2267 printk("\n");
2268 }
2269
2270 if (apm_info.disabled) {
2271 printk(KERN_NOTICE "apm: disabled on user request.\n");
2272 return -ENODEV;
2273 }
2274 if ((num_online_cpus() > 1) && !power_off && !smp) {
2275 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2276 apm_info.disabled = 1;
2277 return -ENODEV;
2278 }
2279 if (pm_flags & PM_ACPI) {
2280 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2281 apm_info.disabled = 1;
2282 return -ENODEV;
2283 }
2284 pm_flags |= PM_APM;
2285
2286 /*
2287 * Set up a segment that references the real mode segment 0x40
2288 * that extends up to the end of page zero (that we have reserved).
2289 * This is for buggy BIOS's that refer to (real mode) segment 0x40
2290 * even though they are called in protected mode.
2291 */
2292 set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
2293 _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
2294
2295 /*
2296 * Set up the long jump entry point to the APM BIOS, which is called
2297 * from inline assembly.
2298 */
2299 apm_bios_entry.offset = apm_info.bios.offset;
2300 apm_bios_entry.segment = APM_CS;
2301
2302 /*
2303 * The APM 1.1 BIOS is supposed to provide limit information that it
2304 * recognizes. Many machines do this correctly, but many others do
2305 * not restrict themselves to their claimed limit. When this happens,
2306 * they will cause a segmentation violation in the kernel at boot time.
2307 * Most BIOS's, however, will respect a 64k limit, so we use that.
2308 *
2309 * Note we only set APM segments on CPU zero, since we pin the APM
2310 * code to that CPU.
2311 */
2312 gdt = get_cpu_gdt_table(0);
2313 set_base(gdt[APM_CS >> 3],
2314 __va((unsigned long)apm_info.bios.cseg << 4));
2315 set_base(gdt[APM_CS_16 >> 3],
2316 __va((unsigned long)apm_info.bios.cseg_16 << 4));
2317 set_base(gdt[APM_DS >> 3],
2318 __va((unsigned long)apm_info.bios.dseg << 4));
2319
2320 proc_create("apm", 0, NULL, &apm_file_ops);
2321
2322 kapmd_task = kthread_create(apm, NULL, "kapmd");
2323 if (IS_ERR(kapmd_task)) {
2324 printk(KERN_ERR "apm: disabled - Unable to start kernel "
2325 "thread.\n");
2326 err = PTR_ERR(kapmd_task);
2327 kapmd_task = NULL;
2328 remove_proc_entry("apm", NULL);
2329 return err;
2330 }
2331 wake_up_process(kapmd_task);
2332
2333 if (num_online_cpus() > 1 && !smp) {
2334 printk(KERN_NOTICE
2335 "apm: disabled - APM is not SMP safe (power off active).\n");
2336 return 0;
2337 }
2338
2339 /*
2340 * Note we don't actually care if the misc_device cannot be registered.
2341 * this driver can do its job without it, even if userspace can't
2342 * control it. just log the error
2343 */
2344 if (misc_register(&apm_device))
2345 printk(KERN_WARNING "apm: Could not register misc device.\n");
2346
2347 if (HZ != 100)
2348 idle_period = (idle_period * HZ) / 100;
2349 if (idle_threshold < 100) {
2350 original_pm_idle = pm_idle;
2351 pm_idle = apm_cpu_idle;
2352 set_pm_idle = 1;
2353 }
2354
2355 return 0;
2356 }
2357
2358 static void __exit apm_exit(void)
2359 {
2360 int error;
2361
2362 if (set_pm_idle) {
2363 pm_idle = original_pm_idle;
2364 /*
2365 * We are about to unload the current idle thread pm callback
2366 * (pm_idle), Wait for all processors to update cached/local
2367 * copies of pm_idle before proceeding.
2368 */
2369 cpu_idle_wait();
2370 }
2371 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2372 && (apm_info.connection_version > 0x0100)) {
2373 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2374 if (error)
2375 apm_error("disengage power management", error);
2376 }
2377 misc_deregister(&apm_device);
2378 remove_proc_entry("apm", NULL);
2379 if (power_off)
2380 pm_power_off = NULL;
2381 if (kapmd_task) {
2382 kthread_stop(kapmd_task);
2383 kapmd_task = NULL;
2384 }
2385 pm_flags &= ~PM_APM;
2386 }
2387
2388 module_init(apm_init);
2389 module_exit(apm_exit);
2390
2391 MODULE_AUTHOR("Stephen Rothwell");
2392 MODULE_DESCRIPTION("Advanced Power Management");
2393 MODULE_LICENSE("GPL");
2394 module_param(debug, bool, 0644);
2395 MODULE_PARM_DESC(debug, "Enable debug mode");
2396 module_param(power_off, bool, 0444);
2397 MODULE_PARM_DESC(power_off, "Enable power off");
2398 module_param(bounce_interval, int, 0444);
2399 MODULE_PARM_DESC(bounce_interval,
2400 "Set the number of ticks to ignore suspend bounces");
2401 module_param(allow_ints, bool, 0444);
2402 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2403 module_param(broken_psr, bool, 0444);
2404 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2405 module_param(realmode_power_off, bool, 0444);
2406 MODULE_PARM_DESC(realmode_power_off,
2407 "Switch to real mode before powering off");
2408 module_param(idle_threshold, int, 0444);
2409 MODULE_PARM_DESC(idle_threshold,
2410 "System idle percentage above which to make APM BIOS idle calls");
2411 module_param(idle_period, int, 0444);
2412 MODULE_PARM_DESC(idle_period,
2413 "Period (in sec/100) over which to caculate the idle percentage");
2414 module_param(smp, bool, 0444);
2415 MODULE_PARM_DESC(smp,
2416 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2417 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
Linux kernel - Deliverables
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