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Linux-2.6.12-rc2
[linux-2.6/next.git] / arch / i386 / kernel / apm.c
blob45641a87255009968c6882b4d04fcd4dbf52df90
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 replacment 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/hwdev/busbios/amp_12.htm]
202 */
203
204 #include <linux/config.h>
205 #include <linux/module.h>
206
207 #include <linux/poll.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/miscdevice.h>
216 #include <linux/apm_bios.h>
217 #include <linux/init.h>
218 #include <linux/time.h>
219 #include <linux/sched.h>
220 #include <linux/pm.h>
221 #include <linux/device.h>
222 #include <linux/kernel.h>
223 #include <linux/smp.h>
224 #include <linux/smp_lock.h>
225 #include <linux/dmi.h>
226 #include <linux/suspend.h>
227
228 #include <asm/system.h>
229 #include <asm/uaccess.h>
230 #include <asm/desc.h>
231
232 #include "io_ports.h"
233
234 extern spinlock_t i8253_lock;
235 extern unsigned long get_cmos_time(void);
236 extern void machine_real_restart(unsigned char *, int);
237
238 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
239 extern int (*console_blank_hook)(int);
240 #endif
241
242 /*
243 * The apm_bios device is one of the misc char devices.
244 * This is its minor number.
245 */
246 #define APM_MINOR_DEV 134
247
248 /*
249 * See Documentation/Config.help for the configuration options.
250 *
251 * Various options can be changed at boot time as follows:
252 * (We allow underscores for compatibility with the modules code)
253 * apm=on/off enable/disable APM
254 * [no-]allow[-_]ints allow interrupts during BIOS calls
255 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
256 * [no-]realmode[-_]power[-_]off switch to real mode before
257 * powering off
258 * [no-]debug log some debugging messages
259 * [no-]power[-_]off power off on shutdown
260 * [no-]smp Use apm even on an SMP box
261 * bounce[-_]interval=<n> number of ticks to ignore suspend
262 * bounces
263 * idle[-_]threshold=<n> System idle percentage above which to
264 * make APM BIOS idle calls. Set it to
265 * 100 to disable.
266 * idle[-_]period=<n> Period (in 1/100s of a second) over
267 * which the idle percentage is
268 * calculated.
269 */
270
271 /* KNOWN PROBLEM MACHINES:
272 *
273 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
274 * [Confirmed by TI representative]
275 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
276 * [Confirmed by BIOS disassembly]
277 * [This may work now ...]
278 * P: Toshiba 1950S: battery life information only gets updated after resume
279 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
280 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
281 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
282 * Neale Banks <neale@lowendale.com.au> December 2000
283 *
284 * Legend: U = unusable with APM patches
285 * P = partially usable with APM patches
286 */
287
288 /*
289 * Define as 1 to make the driver always call the APM BIOS busy
290 * routine even if the clock was not reported as slowed by the
291 * idle routine. Otherwise, define as 0.
292 */
293 #define ALWAYS_CALL_BUSY 1
294
295 /*
296 * Define to make the APM BIOS calls zero all data segment registers (so
297 * that an incorrect BIOS implementation will cause a kernel panic if it
298 * tries to write to arbitrary memory).
299 */
300 #define APM_ZERO_SEGS
301
302 #include "apm.h"
303
304 /*
305 * Define to make all _set_limit calls use 64k limits. The APM 1.1 BIOS is
306 * supposed to provide limit information that it recognizes. Many machines
307 * do this correctly, but many others do not restrict themselves to their
308 * claimed limit. When this happens, they will cause a segmentation
309 * violation in the kernel at boot time. Most BIOS's, however, will
310 * respect a 64k limit, so we use that. If you want to be pedantic and
311 * hold your BIOS to its claims, then undefine this.
312 */
313 #define APM_RELAX_SEGMENTS
314
315 /*
316 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
317 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
318 * David Chen <chen@ctpa04.mit.edu>
319 */
320 #undef INIT_TIMER_AFTER_SUSPEND
321
322 #ifdef INIT_TIMER_AFTER_SUSPEND
323 #include <linux/timex.h>
324 #include <asm/io.h>
325 #include <linux/delay.h>
326 #endif
327
328 /*
329 * Need to poll the APM BIOS every second
330 */
331 #define APM_CHECK_TIMEOUT (HZ)
332
333 /*
334 * Ignore suspend events for this amount of time after a resume
335 */
336 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
337
338 /*
339 * Maximum number of events stored
340 */
341 #define APM_MAX_EVENTS 20
342
343 /*
344 * The per-file APM data
345 */
346 struct apm_user {
347 int magic;
348 struct apm_user * next;
349 int suser: 1;
350 int writer: 1;
351 int reader: 1;
352 int suspend_wait: 1;
353 int suspend_result;
354 int suspends_pending;
355 int standbys_pending;
356 int suspends_read;
357 int standbys_read;
358 int event_head;
359 int event_tail;
360 apm_event_t events[APM_MAX_EVENTS];
361 };
362
363 /*
364 * The magic number in apm_user
365 */
366 #define APM_BIOS_MAGIC 0x4101
367
368 /*
369 * idle percentage above which bios idle calls are done
370 */
371 #ifdef CONFIG_APM_CPU_IDLE
372 #define DEFAULT_IDLE_THRESHOLD 95
373 #else
374 #define DEFAULT_IDLE_THRESHOLD 100
375 #endif
376 #define DEFAULT_IDLE_PERIOD (100 / 3)
377
378 /*
379 * Local variables
380 */
381 static struct {
382 unsigned long offset;
383 unsigned short segment;
384 } apm_bios_entry;
385 static int clock_slowed;
386 static int idle_threshold = DEFAULT_IDLE_THRESHOLD;
387 static int idle_period = DEFAULT_IDLE_PERIOD;
388 static int set_pm_idle;
389 static int suspends_pending;
390 static int standbys_pending;
391 static int ignore_sys_suspend;
392 static int ignore_normal_resume;
393 static int bounce_interval = DEFAULT_BOUNCE_INTERVAL;
394
395 #ifdef CONFIG_APM_RTC_IS_GMT
396 # define clock_cmos_diff 0
397 # define got_clock_diff 1
398 #else
399 static long clock_cmos_diff;
400 static int got_clock_diff;
401 #endif
402 static int debug;
403 static int smp;
404 static int apm_disabled = -1;
405 #ifdef CONFIG_SMP
406 static int power_off;
407 #else
408 static int power_off = 1;
409 #endif
410 #ifdef CONFIG_APM_REAL_MODE_POWER_OFF
411 static int realmode_power_off = 1;
412 #else
413 static int realmode_power_off;
414 #endif
415 static int exit_kapmd;
416 static int kapmd_running;
417 #ifdef CONFIG_APM_ALLOW_INTS
418 static int allow_ints = 1;
419 #else
420 static int allow_ints;
421 #endif
422 static int broken_psr;
423
424 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
425 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
426 static struct apm_user * user_list;
427 static DEFINE_SPINLOCK(user_list_lock);
428 static struct desc_struct bad_bios_desc = { 0, 0x00409200 };
429
430 static char driver_version[] = "1.16ac"; /* no spaces */
431
432 /*
433 * APM event names taken from the APM 1.2 specification. These are
434 * the message codes that the BIOS uses to tell us about events
435 */
436 static char * apm_event_name[] = {
437 "system standby",
438 "system suspend",
439 "normal resume",
440 "critical resume",
441 "low battery",
442 "power status change",
443 "update time",
444 "critical suspend",
445 "user standby",
446 "user suspend",
447 "system standby resume",
448 "capabilities change"
449 };
450 #define NR_APM_EVENT_NAME \
451 (sizeof(apm_event_name) / sizeof(apm_event_name[0]))
452
453 typedef struct lookup_t {
454 int key;
455 char * msg;
456 } lookup_t;
457
458 /*
459 * The BIOS returns a set of standard error codes in AX when the
460 * carry flag is set.
461 */
462
463 static const lookup_t error_table[] = {
464 /* N/A { APM_SUCCESS, "Operation succeeded" }, */
465 { APM_DISABLED, "Power management disabled" },
466 { APM_CONNECTED, "Real mode interface already connected" },
467 { APM_NOT_CONNECTED, "Interface not connected" },
468 { APM_16_CONNECTED, "16 bit interface already connected" },
469 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
470 { APM_32_CONNECTED, "32 bit interface already connected" },
471 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
472 { APM_BAD_DEVICE, "Unrecognized device ID" },
473 { APM_BAD_PARAM, "Parameter out of range" },
474 { APM_NOT_ENGAGED, "Interface not engaged" },
475 { APM_BAD_FUNCTION, "Function not supported" },
476 { APM_RESUME_DISABLED, "Resume timer disabled" },
477 { APM_BAD_STATE, "Unable to enter requested state" },
478 /* N/A { APM_NO_EVENTS, "No events pending" }, */
479 { APM_NO_ERROR, "BIOS did not set a return code" },
480 { APM_NOT_PRESENT, "No APM present" }
481 };
482 #define ERROR_COUNT (sizeof(error_table)/sizeof(lookup_t))
483
484 /**
485 * apm_error - display an APM error
486 * @str: information string
487 * @err: APM BIOS return code
488 *
489 * Write a meaningful log entry to the kernel log in the event of
490 * an APM error.
491 */
492
493 static void apm_error(char *str, int err)
494 {
495 int i;
496
497 for (i = 0; i < ERROR_COUNT; i++)
498 if (error_table[i].key == err) break;
499 if (i < ERROR_COUNT)
500 printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
501 else
502 printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
503 str, err);
504 }
505
506 /*
507 * Lock APM functionality to physical CPU 0
508 */
509
510 #ifdef CONFIG_SMP
511
512 static cpumask_t apm_save_cpus(void)
513 {
514 cpumask_t x = current->cpus_allowed;
515 /* Some bioses don't like being called from CPU != 0 */
516 set_cpus_allowed(current, cpumask_of_cpu(0));
517 BUG_ON(smp_processor_id() != 0);
518 return x;
519 }
520
521 static inline void apm_restore_cpus(cpumask_t mask)
522 {
523 set_cpus_allowed(current, mask);
524 }
525
526 #else
527
528 /*
529 * No CPU lockdown needed on a uniprocessor
530 */
531
532 #define apm_save_cpus() (current->cpus_allowed)
533 #define apm_restore_cpus(x) (void)(x)
534
535 #endif
536
537 /*
538 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
539 * apm_info.allow_ints, we are being really paranoid here! Not only
540 * are interrupts disabled, but all the segment registers (except SS)
541 * are saved and zeroed this means that if the BIOS tries to reference
542 * any data without explicitly loading the segment registers, the kernel
543 * will fault immediately rather than have some unforeseen circumstances
544 * for the rest of the kernel. And it will be very obvious! :-) Doing
545 * this depends on CS referring to the same physical memory as DS so that
546 * DS can be zeroed before the call. Unfortunately, we can't do anything
547 * about the stack segment/pointer. Also, we tell the compiler that
548 * everything could change.
549 *
550 * Also, we KNOW that for the non error case of apm_bios_call, there
551 * is no useful data returned in the low order 8 bits of eax.
552 */
553 #define APM_DO_CLI \
554 if (apm_info.allow_ints) \
555 local_irq_enable(); \
556 else \
557 local_irq_disable();
558
559 #ifdef APM_ZERO_SEGS
560 # define APM_DECL_SEGS \
561 unsigned int saved_fs; unsigned int saved_gs;
562 # define APM_DO_SAVE_SEGS \
563 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
564 # define APM_DO_RESTORE_SEGS \
565 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
566 #else
567 # define APM_DECL_SEGS
568 # define APM_DO_SAVE_SEGS
569 # define APM_DO_RESTORE_SEGS
570 #endif
571
572 /**
573 * apm_bios_call - Make an APM BIOS 32bit call
574 * @func: APM function to execute
575 * @ebx_in: EBX register for call entry
576 * @ecx_in: ECX register for call entry
577 * @eax: EAX register return
578 * @ebx: EBX register return
579 * @ecx: ECX register return
580 * @edx: EDX register return
581 * @esi: ESI register return
582 *
583 * Make an APM call using the 32bit protected mode interface. The
584 * caller is responsible for knowing if APM BIOS is configured and
585 * enabled. This call can disable interrupts for a long period of
586 * time on some laptops. The return value is in AH and the carry
587 * flag is loaded into AL. If there is an error, then the error
588 * code is returned in AH (bits 8-15 of eax) and this function
589 * returns non-zero.
590 */
591
592 static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in,
593 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi)
594 {
595 APM_DECL_SEGS
596 unsigned long flags;
597 cpumask_t cpus;
598 int cpu;
599 struct desc_struct save_desc_40;
600
601 cpus = apm_save_cpus();
602
603 cpu = get_cpu();
604 save_desc_40 = per_cpu(cpu_gdt_table, cpu)[0x40 / 8];
605 per_cpu(cpu_gdt_table, cpu)[0x40 / 8] = bad_bios_desc;
606
607 local_save_flags(flags);
608 APM_DO_CLI;
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 local_irq_restore(flags);
613 per_cpu(cpu_gdt_table, cpu)[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 does only returns one value, 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
643
644 cpus = apm_save_cpus();
645
646 cpu = get_cpu();
647 save_desc_40 = per_cpu(cpu_gdt_table, cpu)[0x40 / 8];
648 per_cpu(cpu_gdt_table, cpu)[0x40 / 8] = bad_bios_desc;
649
650 local_save_flags(flags);
651 APM_DO_CLI;
652 APM_DO_SAVE_SEGS;
653 error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax);
654 APM_DO_RESTORE_SEGS;
655 local_irq_restore(flags);
656 __get_cpu_var(cpu_gdt_table)[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
771 if (apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax)) {
772 static unsigned long t;
773
774 /* This always fails on some SMP boards running UP kernels.
775 * Only report the failure the first 5 times.
776 */
777 if (++t < 5)
778 {
779 printk(KERN_DEBUG "apm_do_idle failed (%d)\n",
780 (eax >> 8) & 0xff);
781 t = jiffies;
782 }
783 return -1;
784 }
785 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
786 return clock_slowed;
787 }
788
789 /**
790 * apm_do_busy - inform the BIOS the CPU is busy
791 *
792 * Request that the BIOS brings the CPU back to full performance.
793 */
794
795 static void apm_do_busy(void)
796 {
797 u32 dummy;
798
799 if (clock_slowed || ALWAYS_CALL_BUSY) {
800 (void) apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy);
801 clock_slowed = 0;
802 }
803 }
804
805 /*
806 * If no process has really been interested in
807 * the CPU for some time, we want to call BIOS
808 * power management - we probably want
809 * to conserve power.
810 */
811 #define IDLE_CALC_LIMIT (HZ * 100)
812 #define IDLE_LEAKY_MAX 16
813
814 static void (*original_pm_idle)(void);
815
816 extern void default_idle(void);
817
818 /**
819 * apm_cpu_idle - cpu idling for APM capable Linux
820 *
821 * This is the idling function the kernel executes when APM is available. It
822 * tries to do BIOS powermanagement based on the average system idle time.
823 * Furthermore it calls the system default idle routine.
824 */
825
826 static void apm_cpu_idle(void)
827 {
828 static int use_apm_idle; /* = 0 */
829 static unsigned int last_jiffies; /* = 0 */
830 static unsigned int last_stime; /* = 0 */
831
832 int apm_idle_done = 0;
833 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
834 unsigned int bucket;
835
836 recalc:
837 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
838 use_apm_idle = 0;
839 last_jiffies = jiffies;
840 last_stime = current->stime;
841 } else if (jiffies_since_last_check > idle_period) {
842 unsigned int idle_percentage;
843
844 idle_percentage = current->stime - last_stime;
845 idle_percentage *= 100;
846 idle_percentage /= jiffies_since_last_check;
847 use_apm_idle = (idle_percentage > idle_threshold);
848 if (apm_info.forbid_idle)
849 use_apm_idle = 0;
850 last_jiffies = jiffies;
851 last_stime = current->stime;
852 }
853
854 bucket = IDLE_LEAKY_MAX;
855
856 while (!need_resched()) {
857 if (use_apm_idle) {
858 unsigned int t;
859
860 t = jiffies;
861 switch (apm_do_idle()) {
862 case 0: apm_idle_done = 1;
863 if (t != jiffies) {
864 if (bucket) {
865 bucket = IDLE_LEAKY_MAX;
866 continue;
867 }
868 } else if (bucket) {
869 bucket--;
870 continue;
871 }
872 break;
873 case 1: apm_idle_done = 1;
874 break;
875 default: /* BIOS refused */
876 break;
877 }
878 }
879 if (original_pm_idle)
880 original_pm_idle();
881 else
882 default_idle();
883 jiffies_since_last_check = jiffies - last_jiffies;
884 if (jiffies_since_last_check > idle_period)
885 goto recalc;
886 }
887
888 if (apm_idle_done)
889 apm_do_busy();
890 }
891
892 /**
893 * apm_power_off - ask the BIOS to power off
894 *
895 * Handle the power off sequence. This is the one piece of code we
896 * will execute even on SMP machines. In order to deal with BIOS
897 * bugs we support real mode APM BIOS power off calls. We also make
898 * the SMP call on CPU0 as some systems will only honour this call
899 * on their first cpu.
900 */
901
902 static void apm_power_off(void)
903 {
904 unsigned char po_bios_call[] = {
905 0xb8, 0x00, 0x10, /* movw $0x1000,ax */
906 0x8e, 0xd0, /* movw ax,ss */
907 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
908 0xb8, 0x07, 0x53, /* movw $0x5307,ax */
909 0xbb, 0x01, 0x00, /* movw $0x0001,bx */
910 0xb9, 0x03, 0x00, /* movw $0x0003,cx */
911 0xcd, 0x15 /* int $0x15 */
912 };
913
914 /*
915 * This may be called on an SMP machine.
916 */
917 #ifdef CONFIG_SMP
918 /* Some bioses don't like being called from CPU != 0 */
919 set_cpus_allowed(current, cpumask_of_cpu(0));
920 BUG_ON(smp_processor_id() != 0);
921 #endif
922 if (apm_info.realmode_power_off)
923 {
924 (void)apm_save_cpus();
925 machine_real_restart(po_bios_call, sizeof(po_bios_call));
926 }
927 else
928 (void) set_system_power_state(APM_STATE_OFF);
929 }
930
931 #ifdef CONFIG_APM_DO_ENABLE
932
933 /**
934 * apm_enable_power_management - enable BIOS APM power management
935 * @enable: enable yes/no
936 *
937 * Enable or disable the APM BIOS power services.
938 */
939
940 static int apm_enable_power_management(int enable)
941 {
942 u32 eax;
943
944 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
945 return APM_NOT_ENGAGED;
946 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
947 enable, &eax))
948 return (eax >> 8) & 0xff;
949 if (enable)
950 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
951 else
952 apm_info.bios.flags |= APM_BIOS_DISABLED;
953 return APM_SUCCESS;
954 }
955 #endif
956
957 /**
958 * apm_get_power_status - get current power state
959 * @status: returned status
960 * @bat: battery info
961 * @life: estimated life
962 *
963 * Obtain the current power status from the APM BIOS. We return a
964 * status which gives the rough battery status, and current power
965 * source. The bat value returned give an estimate as a percentage
966 * of life and a status value for the battery. The estimated life
967 * if reported is a lifetime in secodnds/minutes at current powwer
968 * consumption.
969 */
970
971 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
972 {
973 u32 eax;
974 u32 ebx;
975 u32 ecx;
976 u32 edx;
977 u32 dummy;
978
979 if (apm_info.get_power_status_broken)
980 return APM_32_UNSUPPORTED;
981 if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0,
982 &eax, &ebx, &ecx, &edx, &dummy))
983 return (eax >> 8) & 0xff;
984 *status = ebx;
985 *bat = ecx;
986 if (apm_info.get_power_status_swabinminutes) {
987 *life = swab16((u16)edx);
988 *life |= 0x8000;
989 } else
990 *life = edx;
991 return APM_SUCCESS;
992 }
993
994 #if 0
995 static int apm_get_battery_status(u_short which, u_short *status,
996 u_short *bat, u_short *life, u_short *nbat)
997 {
998 u32 eax;
999 u32 ebx;
1000 u32 ecx;
1001 u32 edx;
1002 u32 esi;
1003
1004 if (apm_info.connection_version < 0x0102) {
1005 /* pretend we only have one battery. */
1006 if (which != 1)
1007 return APM_BAD_DEVICE;
1008 *nbat = 1;
1009 return apm_get_power_status(status, bat, life);
1010 }
1011
1012 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1013 &ebx, &ecx, &edx, &esi))
1014 return (eax >> 8) & 0xff;
1015 *status = ebx;
1016 *bat = ecx;
1017 *life = edx;
1018 *nbat = esi;
1019 return APM_SUCCESS;
1020 }
1021 #endif
1022
1023 /**
1024 * apm_engage_power_management - enable PM on a device
1025 * @device: identity of device
1026 * @enable: on/off
1027 *
1028 * Activate or deactive power management on either a specific device
1029 * or the entire system (%APM_DEVICE_ALL).
1030 */
1031
1032 static int apm_engage_power_management(u_short device, int enable)
1033 {
1034 u32 eax;
1035
1036 if ((enable == 0) && (device == APM_DEVICE_ALL)
1037 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1038 return APM_DISABLED;
1039 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax))
1040 return (eax >> 8) & 0xff;
1041 if (device == APM_DEVICE_ALL) {
1042 if (enable)
1043 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1044 else
1045 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1046 }
1047 return APM_SUCCESS;
1048 }
1049
1050 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1051
1052 /**
1053 * apm_console_blank - blank the display
1054 * @blank: on/off
1055 *
1056 * Attempt to blank the console, firstly by blanking just video device
1057 * zero, and if that fails (some BIOSes don't support it) then it blanks
1058 * all video devices. Typically the BIOS will do laptop backlight and
1059 * monitor powerdown for us.
1060 */
1061
1062 static int apm_console_blank(int blank)
1063 {
1064 int error;
1065 u_short state;
1066
1067 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1068 /* Blank the first display device */
1069 error = set_power_state(0x100, state);
1070 if ((error != APM_SUCCESS) && (error != APM_NO_ERROR)) {
1071 /* try to blank them all instead */
1072 error = set_power_state(0x1ff, state);
1073 if ((error != APM_SUCCESS) && (error != APM_NO_ERROR))
1074 /* try to blank device one instead */
1075 error = set_power_state(0x101, state);
1076 }
1077 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1078 return 1;
1079 if (error == APM_NOT_ENGAGED) {
1080 static int tried;
1081 int eng_error;
1082 if (tried++ == 0) {
1083 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1084 if (eng_error) {
1085 apm_error("set display", error);
1086 apm_error("engage interface", eng_error);
1087 return 0;
1088 } else
1089 return apm_console_blank(blank);
1090 }
1091 }
1092 apm_error("set display", error);
1093 return 0;
1094 }
1095 #endif
1096
1097 static int queue_empty(struct apm_user *as)
1098 {
1099 return as->event_head == as->event_tail;
1100 }
1101
1102 static apm_event_t get_queued_event(struct apm_user *as)
1103 {
1104 as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
1105 return as->events[as->event_tail];
1106 }
1107
1108 static void queue_event(apm_event_t event, struct apm_user *sender)
1109 {
1110 struct apm_user * as;
1111
1112 spin_lock(&user_list_lock);
1113 if (user_list == NULL)
1114 goto out;
1115 for (as = user_list; as != NULL; as = as->next) {
1116 if ((as == sender) || (!as->reader))
1117 continue;
1118 as->event_head = (as->event_head + 1) % APM_MAX_EVENTS;
1119 if (as->event_head == as->event_tail) {
1120 static int notified;
1121
1122 if (notified++ == 0)
1123 printk(KERN_ERR "apm: an event queue overflowed\n");
1124 as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
1125 }
1126 as->events[as->event_head] = event;
1127 if ((!as->suser) || (!as->writer))
1128 continue;
1129 switch (event) {
1130 case APM_SYS_SUSPEND:
1131 case APM_USER_SUSPEND:
1132 as->suspends_pending++;
1133 suspends_pending++;
1134 break;
1135
1136 case APM_SYS_STANDBY:
1137 case APM_USER_STANDBY:
1138 as->standbys_pending++;
1139 standbys_pending++;
1140 break;
1141 }
1142 }
1143 wake_up_interruptible(&apm_waitqueue);
1144 out:
1145 spin_unlock(&user_list_lock);
1146 }
1147
1148 static void set_time(void)
1149 {
1150 if (got_clock_diff) { /* Must know time zone in order to set clock */
1151 xtime.tv_sec = get_cmos_time() + clock_cmos_diff;
1152 xtime.tv_nsec = 0;
1153 }
1154 }
1155
1156 static void get_time_diff(void)
1157 {
1158 #ifndef CONFIG_APM_RTC_IS_GMT
1159 /*
1160 * Estimate time zone so that set_time can update the clock
1161 */
1162 clock_cmos_diff = -get_cmos_time();
1163 clock_cmos_diff += get_seconds();
1164 got_clock_diff = 1;
1165 #endif
1166 }
1167
1168 static void reinit_timer(void)
1169 {
1170 #ifdef INIT_TIMER_AFTER_SUSPEND
1171 unsigned long flags;
1172 extern spinlock_t i8253_lock;
1173
1174 spin_lock_irqsave(&i8253_lock, flags);
1175 /* set the clock to 100 Hz */
1176 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1177 udelay(10);
1178 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1179 udelay(10);
1180 outb(LATCH >> 8, PIT_CH0); /* MSB */
1181 udelay(10);
1182 spin_unlock_irqrestore(&i8253_lock, flags);
1183 #endif
1184 }
1185
1186 static int suspend(int vetoable)
1187 {
1188 int err;
1189 struct apm_user *as;
1190
1191 if (pm_send_all(PM_SUSPEND, (void *)3)) {
1192 /* Vetoed */
1193 if (vetoable) {
1194 if (apm_info.connection_version > 0x100)
1195 set_system_power_state(APM_STATE_REJECT);
1196 err = -EBUSY;
1197 ignore_sys_suspend = 0;
1198 printk(KERN_WARNING "apm: suspend was vetoed.\n");
1199 goto out;
1200 }
1201 printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
1202 }
1203
1204 device_suspend(PMSG_SUSPEND);
1205 local_irq_disable();
1206 device_power_down(PMSG_SUSPEND);
1207
1208 /* serialize with the timer interrupt */
1209 write_seqlock(&xtime_lock);
1210
1211 /* protect against access to timer chip registers */
1212 spin_lock(&i8253_lock);
1213
1214 get_time_diff();
1215 /*
1216 * Irq spinlock must be dropped around set_system_power_state.
1217 * We'll undo any timer changes due to interrupts below.
1218 */
1219 spin_unlock(&i8253_lock);
1220 write_sequnlock(&xtime_lock);
1221 local_irq_enable();
1222
1223 save_processor_state();
1224 err = set_system_power_state(APM_STATE_SUSPEND);
1225 restore_processor_state();
1226
1227 local_irq_disable();
1228 write_seqlock(&xtime_lock);
1229 spin_lock(&i8253_lock);
1230 reinit_timer();
1231 set_time();
1232 ignore_normal_resume = 1;
1233
1234 spin_unlock(&i8253_lock);
1235 write_sequnlock(&xtime_lock);
1236
1237 if (err == APM_NO_ERROR)
1238 err = APM_SUCCESS;
1239 if (err != APM_SUCCESS)
1240 apm_error("suspend", err);
1241 err = (err == APM_SUCCESS) ? 0 : -EIO;
1242 device_power_up();
1243 local_irq_enable();
1244 device_resume();
1245 pm_send_all(PM_RESUME, (void *)0);
1246 queue_event(APM_NORMAL_RESUME, NULL);
1247 out:
1248 spin_lock(&user_list_lock);
1249 for (as = user_list; as != NULL; as = as->next) {
1250 as->suspend_wait = 0;
1251 as->suspend_result = err;
1252 }
1253 spin_unlock(&user_list_lock);
1254 wake_up_interruptible(&apm_suspend_waitqueue);
1255 return err;
1256 }
1257
1258 static void standby(void)
1259 {
1260 int err;
1261
1262 local_irq_disable();
1263 device_power_down(PMSG_SUSPEND);
1264 /* serialize with the timer interrupt */
1265 write_seqlock(&xtime_lock);
1266 /* If needed, notify drivers here */
1267 get_time_diff();
1268 write_sequnlock(&xtime_lock);
1269 local_irq_enable();
1270
1271 err = set_system_power_state(APM_STATE_STANDBY);
1272 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1273 apm_error("standby", err);
1274
1275 local_irq_disable();
1276 device_power_up();
1277 local_irq_enable();
1278 }
1279
1280 static apm_event_t get_event(void)
1281 {
1282 int error;
1283 apm_event_t event;
1284 apm_eventinfo_t info;
1285
1286 static int notified;
1287
1288 /* we don't use the eventinfo */
1289 error = apm_get_event(&event, &info);
1290 if (error == APM_SUCCESS)
1291 return event;
1292
1293 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1294 apm_error("get_event", error);
1295
1296 return 0;
1297 }
1298
1299 static void check_events(void)
1300 {
1301 apm_event_t event;
1302 static unsigned long last_resume;
1303 static int ignore_bounce;
1304
1305 while ((event = get_event()) != 0) {
1306 if (debug) {
1307 if (event <= NR_APM_EVENT_NAME)
1308 printk(KERN_DEBUG "apm: received %s notify\n",
1309 apm_event_name[event - 1]);
1310 else
1311 printk(KERN_DEBUG "apm: received unknown "
1312 "event 0x%02x\n", event);
1313 }
1314 if (ignore_bounce
1315 && ((jiffies - last_resume) > bounce_interval))
1316 ignore_bounce = 0;
1317
1318 switch (event) {
1319 case APM_SYS_STANDBY:
1320 case APM_USER_STANDBY:
1321 queue_event(event, NULL);
1322 if (standbys_pending <= 0)
1323 standby();
1324 break;
1325
1326 case APM_USER_SUSPEND:
1327 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1328 if (apm_info.connection_version > 0x100)
1329 set_system_power_state(APM_STATE_REJECT);
1330 break;
1331 #endif
1332 case APM_SYS_SUSPEND:
1333 if (ignore_bounce) {
1334 if (apm_info.connection_version > 0x100)
1335 set_system_power_state(APM_STATE_REJECT);
1336 break;
1337 }
1338 /*
1339 * If we are already processing a SUSPEND,
1340 * then further SUSPEND events from the BIOS
1341 * will be ignored. We also return here to
1342 * cope with the fact that the Thinkpads keep
1343 * sending a SUSPEND event until something else
1344 * happens!
1345 */
1346 if (ignore_sys_suspend)
1347 return;
1348 ignore_sys_suspend = 1;
1349 queue_event(event, NULL);
1350 if (suspends_pending <= 0)
1351 (void) suspend(1);
1352 break;
1353
1354 case APM_NORMAL_RESUME:
1355 case APM_CRITICAL_RESUME:
1356 case APM_STANDBY_RESUME:
1357 ignore_sys_suspend = 0;
1358 last_resume = jiffies;
1359 ignore_bounce = 1;
1360 if ((event != APM_NORMAL_RESUME)
1361 || (ignore_normal_resume == 0)) {
1362 write_seqlock_irq(&xtime_lock);
1363 set_time();
1364 write_sequnlock_irq(&xtime_lock);
1365 device_resume();
1366 pm_send_all(PM_RESUME, (void *)0);
1367 queue_event(event, NULL);
1368 }
1369 ignore_normal_resume = 0;
1370 break;
1371
1372 case APM_CAPABILITY_CHANGE:
1373 case APM_LOW_BATTERY:
1374 case APM_POWER_STATUS_CHANGE:
1375 queue_event(event, NULL);
1376 /* If needed, notify drivers here */
1377 break;
1378
1379 case APM_UPDATE_TIME:
1380 write_seqlock_irq(&xtime_lock);
1381 set_time();
1382 write_sequnlock_irq(&xtime_lock);
1383 break;
1384
1385 case APM_CRITICAL_SUSPEND:
1386 /*
1387 * We are not allowed to reject a critical suspend.
1388 */
1389 (void) suspend(0);
1390 break;
1391 }
1392 }
1393 }
1394
1395 static void apm_event_handler(void)
1396 {
1397 static int pending_count = 4;
1398 int err;
1399
1400 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1401 if ((apm_info.connection_version > 0x100) &&
1402 (pending_count-- <= 0)) {
1403 pending_count = 4;
1404 if (debug)
1405 printk(KERN_DEBUG "apm: setting state busy\n");
1406 err = set_system_power_state(APM_STATE_BUSY);
1407 if (err)
1408 apm_error("busy", err);
1409 }
1410 } else
1411 pending_count = 4;
1412 check_events();
1413 }
1414
1415 /*
1416 * This is the APM thread main loop.
1417 */
1418
1419 static void apm_mainloop(void)
1420 {
1421 DECLARE_WAITQUEUE(wait, current);
1422
1423 add_wait_queue(&apm_waitqueue, &wait);
1424 set_current_state(TASK_INTERRUPTIBLE);
1425 for (;;) {
1426 schedule_timeout(APM_CHECK_TIMEOUT);
1427 if (exit_kapmd)
1428 break;
1429 /*
1430 * Ok, check all events, check for idle (and mark us sleeping
1431 * so as not to count towards the load average)..
1432 */
1433 set_current_state(TASK_INTERRUPTIBLE);
1434 apm_event_handler();
1435 }
1436 remove_wait_queue(&apm_waitqueue, &wait);
1437 }
1438
1439 static int check_apm_user(struct apm_user *as, const char *func)
1440 {
1441 if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) {
1442 printk(KERN_ERR "apm: %s passed bad filp\n", func);
1443 return 1;
1444 }
1445 return 0;
1446 }
1447
1448 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1449 {
1450 struct apm_user * as;
1451 int i;
1452 apm_event_t event;
1453
1454 as = fp->private_data;
1455 if (check_apm_user(as, "read"))
1456 return -EIO;
1457 if ((int)count < sizeof(apm_event_t))
1458 return -EINVAL;
1459 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1460 return -EAGAIN;
1461 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1462 i = count;
1463 while ((i >= sizeof(event)) && !queue_empty(as)) {
1464 event = get_queued_event(as);
1465 if (copy_to_user(buf, &event, sizeof(event))) {
1466 if (i < count)
1467 break;
1468 return -EFAULT;
1469 }
1470 switch (event) {
1471 case APM_SYS_SUSPEND:
1472 case APM_USER_SUSPEND:
1473 as->suspends_read++;
1474 break;
1475
1476 case APM_SYS_STANDBY:
1477 case APM_USER_STANDBY:
1478 as->standbys_read++;
1479 break;
1480 }
1481 buf += sizeof(event);
1482 i -= sizeof(event);
1483 }
1484 if (i < count)
1485 return count - i;
1486 if (signal_pending(current))
1487 return -ERESTARTSYS;
1488 return 0;
1489 }
1490
1491 static unsigned int do_poll(struct file *fp, poll_table * wait)
1492 {
1493 struct apm_user * as;
1494
1495 as = fp->private_data;
1496 if (check_apm_user(as, "poll"))
1497 return 0;
1498 poll_wait(fp, &apm_waitqueue, wait);
1499 if (!queue_empty(as))
1500 return POLLIN | POLLRDNORM;
1501 return 0;
1502 }
1503
1504 static int do_ioctl(struct inode * inode, struct file *filp,
1505 u_int cmd, u_long arg)
1506 {
1507 struct apm_user * as;
1508
1509 as = filp->private_data;
1510 if (check_apm_user(as, "ioctl"))
1511 return -EIO;
1512 if ((!as->suser) || (!as->writer))
1513 return -EPERM;
1514 switch (cmd) {
1515 case APM_IOC_STANDBY:
1516 if (as->standbys_read > 0) {
1517 as->standbys_read--;
1518 as->standbys_pending--;
1519 standbys_pending--;
1520 } else
1521 queue_event(APM_USER_STANDBY, as);
1522 if (standbys_pending <= 0)
1523 standby();
1524 break;
1525 case APM_IOC_SUSPEND:
1526 if (as->suspends_read > 0) {
1527 as->suspends_read--;
1528 as->suspends_pending--;
1529 suspends_pending--;
1530 } else
1531 queue_event(APM_USER_SUSPEND, as);
1532 if (suspends_pending <= 0) {
1533 return suspend(1);
1534 } else {
1535 as->suspend_wait = 1;
1536 wait_event_interruptible(apm_suspend_waitqueue,
1537 as->suspend_wait == 0);
1538 return as->suspend_result;
1539 }
1540 break;
1541 default:
1542 return -EINVAL;
1543 }
1544 return 0;
1545 }
1546
1547 static int do_release(struct inode * inode, struct file * filp)
1548 {
1549 struct apm_user * as;
1550
1551 as = filp->private_data;
1552 if (check_apm_user(as, "release"))
1553 return 0;
1554 filp->private_data = NULL;
1555 if (as->standbys_pending > 0) {
1556 standbys_pending -= as->standbys_pending;
1557 if (standbys_pending <= 0)
1558 standby();
1559 }
1560 if (as->suspends_pending > 0) {
1561 suspends_pending -= as->suspends_pending;
1562 if (suspends_pending <= 0)
1563 (void) suspend(1);
1564 }
1565 spin_lock(&user_list_lock);
1566 if (user_list == as)
1567 user_list = as->next;
1568 else {
1569 struct apm_user * as1;
1570
1571 for (as1 = user_list;
1572 (as1 != NULL) && (as1->next != as);
1573 as1 = as1->next)
1574 ;
1575 if (as1 == NULL)
1576 printk(KERN_ERR "apm: filp not in user list\n");
1577 else
1578 as1->next = as->next;
1579 }
1580 spin_unlock(&user_list_lock);
1581 kfree(as);
1582 return 0;
1583 }
1584
1585 static int do_open(struct inode * inode, struct file * filp)
1586 {
1587 struct apm_user * as;
1588
1589 as = (struct apm_user *)kmalloc(sizeof(*as), GFP_KERNEL);
1590 if (as == NULL) {
1591 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1592 sizeof(*as));
1593 return -ENOMEM;
1594 }
1595 as->magic = APM_BIOS_MAGIC;
1596 as->event_tail = as->event_head = 0;
1597 as->suspends_pending = as->standbys_pending = 0;
1598 as->suspends_read = as->standbys_read = 0;
1599 /*
1600 * XXX - this is a tiny bit broken, when we consider BSD
1601 * process accounting. If the device is opened by root, we
1602 * instantly flag that we used superuser privs. Who knows,
1603 * we might close the device immediately without doing a
1604 * privileged operation -- cevans
1605 */
1606 as->suser = capable(CAP_SYS_ADMIN);
1607 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1608 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1609 spin_lock(&user_list_lock);
1610 as->next = user_list;
1611 user_list = as;
1612 spin_unlock(&user_list_lock);
1613 filp->private_data = as;
1614 return 0;
1615 }
1616
1617 static int apm_get_info(char *buf, char **start, off_t fpos, int length)
1618 {
1619 char * p;
1620 unsigned short bx;
1621 unsigned short cx;
1622 unsigned short dx;
1623 int error;
1624 unsigned short ac_line_status = 0xff;
1625 unsigned short battery_status = 0xff;
1626 unsigned short battery_flag = 0xff;
1627 int percentage = -1;
1628 int time_units = -1;
1629 char *units = "?";
1630
1631 p = buf;
1632
1633 if ((num_online_cpus() == 1) &&
1634 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1635 ac_line_status = (bx >> 8) & 0xff;
1636 battery_status = bx & 0xff;
1637 if ((cx & 0xff) != 0xff)
1638 percentage = cx & 0xff;
1639
1640 if (apm_info.connection_version > 0x100) {
1641 battery_flag = (cx >> 8) & 0xff;
1642 if (dx != 0xffff) {
1643 units = (dx & 0x8000) ? "min" : "sec";
1644 time_units = dx & 0x7fff;
1645 }
1646 }
1647 }
1648 /* Arguments, with symbols from linux/apm_bios.h. Information is
1649 from the Get Power Status (0x0a) call unless otherwise noted.
1650
1651 0) Linux driver version (this will change if format changes)
1652 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1653 2) APM flags from APM Installation Check (0x00):
1654 bit 0: APM_16_BIT_SUPPORT
1655 bit 1: APM_32_BIT_SUPPORT
1656 bit 2: APM_IDLE_SLOWS_CLOCK
1657 bit 3: APM_BIOS_DISABLED
1658 bit 4: APM_BIOS_DISENGAGED
1659 3) AC line status
1660 0x00: Off-line
1661 0x01: On-line
1662 0x02: On backup power (BIOS >= 1.1 only)
1663 0xff: Unknown
1664 4) Battery status
1665 0x00: High
1666 0x01: Low
1667 0x02: Critical
1668 0x03: Charging
1669 0x04: Selected battery not present (BIOS >= 1.2 only)
1670 0xff: Unknown
1671 5) Battery flag
1672 bit 0: High
1673 bit 1: Low
1674 bit 2: Critical
1675 bit 3: Charging
1676 bit 7: No system battery
1677 0xff: Unknown
1678 6) Remaining battery life (percentage of charge):
1679 0-100: valid
1680 -1: Unknown
1681 7) Remaining battery life (time units):
1682 Number of remaining minutes or seconds
1683 -1: Unknown
1684 8) min = minutes; sec = seconds */
1685
1686 p += sprintf(p, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1687 driver_version,
1688 (apm_info.bios.version >> 8) & 0xff,
1689 apm_info.bios.version & 0xff,
1690 apm_info.bios.flags,
1691 ac_line_status,
1692 battery_status,
1693 battery_flag,
1694 percentage,
1695 time_units,
1696 units);
1697
1698 return p - buf;
1699 }
1700
1701 static int apm(void *unused)
1702 {
1703 unsigned short bx;
1704 unsigned short cx;
1705 unsigned short dx;
1706 int error;
1707 char * power_stat;
1708 char * bat_stat;
1709
1710 kapmd_running = 1;
1711
1712 daemonize("kapmd");
1713
1714 current->flags |= PF_NOFREEZE;
1715
1716 #ifdef CONFIG_SMP
1717 /* 2002/08/01 - WT
1718 * This is to avoid random crashes at boot time during initialization
1719 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1720 * Some bioses don't like being called from CPU != 0.
1721 * Method suggested by Ingo Molnar.
1722 */
1723 set_cpus_allowed(current, cpumask_of_cpu(0));
1724 BUG_ON(smp_processor_id() != 0);
1725 #endif
1726
1727 if (apm_info.connection_version == 0) {
1728 apm_info.connection_version = apm_info.bios.version;
1729 if (apm_info.connection_version > 0x100) {
1730 /*
1731 * We only support BIOSs up to version 1.2
1732 */
1733 if (apm_info.connection_version > 0x0102)
1734 apm_info.connection_version = 0x0102;
1735 error = apm_driver_version(&apm_info.connection_version);
1736 if (error != APM_SUCCESS) {
1737 apm_error("driver version", error);
1738 /* Fall back to an APM 1.0 connection. */
1739 apm_info.connection_version = 0x100;
1740 }
1741 }
1742 }
1743
1744 if (debug)
1745 printk(KERN_INFO "apm: Connection version %d.%d\n",
1746 (apm_info.connection_version >> 8) & 0xff,
1747 apm_info.connection_version & 0xff);
1748
1749 #ifdef CONFIG_APM_DO_ENABLE
1750 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1751 /*
1752 * This call causes my NEC UltraLite Versa 33/C to hang if it
1753 * is booted with PM disabled but not in the docking station.
1754 * Unfortunate ...
1755 */
1756 error = apm_enable_power_management(1);
1757 if (error) {
1758 apm_error("enable power management", error);
1759 return -1;
1760 }
1761 }
1762 #endif
1763
1764 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1765 && (apm_info.connection_version > 0x0100)) {
1766 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1767 if (error) {
1768 apm_error("engage power management", error);
1769 return -1;
1770 }
1771 }
1772
1773 if (debug && (num_online_cpus() == 1 || smp )) {
1774 error = apm_get_power_status(&bx, &cx, &dx);
1775 if (error)
1776 printk(KERN_INFO "apm: power status not available\n");
1777 else {
1778 switch ((bx >> 8) & 0xff) {
1779 case 0: power_stat = "off line"; break;
1780 case 1: power_stat = "on line"; break;
1781 case 2: power_stat = "on backup power"; break;
1782 default: power_stat = "unknown"; break;
1783 }
1784 switch (bx & 0xff) {
1785 case 0: bat_stat = "high"; break;
1786 case 1: bat_stat = "low"; break;
1787 case 2: bat_stat = "critical"; break;
1788 case 3: bat_stat = "charging"; break;
1789 default: bat_stat = "unknown"; break;
1790 }
1791 printk(KERN_INFO
1792 "apm: AC %s, battery status %s, battery life ",
1793 power_stat, bat_stat);
1794 if ((cx & 0xff) == 0xff)
1795 printk("unknown\n");
1796 else
1797 printk("%d%%\n", cx & 0xff);
1798 if (apm_info.connection_version > 0x100) {
1799 printk(KERN_INFO
1800 "apm: battery flag 0x%02x, battery life ",
1801 (cx >> 8) & 0xff);
1802 if (dx == 0xffff)
1803 printk("unknown\n");
1804 else
1805 printk("%d %s\n", dx & 0x7fff,
1806 (dx & 0x8000) ?
1807 "minutes" : "seconds");
1808 }
1809 }
1810 }
1811
1812 /* Install our power off handler.. */
1813 if (power_off)
1814 pm_power_off = apm_power_off;
1815
1816 if (num_online_cpus() == 1 || smp) {
1817 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1818 console_blank_hook = apm_console_blank;
1819 #endif
1820 apm_mainloop();
1821 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1822 console_blank_hook = NULL;
1823 #endif
1824 }
1825 kapmd_running = 0;
1826
1827 return 0;
1828 }
1829
1830 #ifndef MODULE
1831 static int __init apm_setup(char *str)
1832 {
1833 int invert;
1834
1835 while ((str != NULL) && (*str != '\0')) {
1836 if (strncmp(str, "off", 3) == 0)
1837 apm_disabled = 1;
1838 if (strncmp(str, "on", 2) == 0)
1839 apm_disabled = 0;
1840 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1841 (strncmp(str, "bounce_interval=", 16) == 0))
1842 bounce_interval = simple_strtol(str + 16, NULL, 0);
1843 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1844 (strncmp(str, "idle_threshold=", 15) == 0))
1845 idle_threshold = simple_strtol(str + 15, NULL, 0);
1846 if ((strncmp(str, "idle-period=", 12) == 0) ||
1847 (strncmp(str, "idle_period=", 12) == 0))
1848 idle_period = simple_strtol(str + 12, NULL, 0);
1849 invert = (strncmp(str, "no-", 3) == 0) ||
1850 (strncmp(str, "no_", 3) == 0);
1851 if (invert)
1852 str += 3;
1853 if (strncmp(str, "debug", 5) == 0)
1854 debug = !invert;
1855 if ((strncmp(str, "power-off", 9) == 0) ||
1856 (strncmp(str, "power_off", 9) == 0))
1857 power_off = !invert;
1858 if (strncmp(str, "smp", 3) == 0)
1859 {
1860 smp = !invert;
1861 idle_threshold = 100;
1862 }
1863 if ((strncmp(str, "allow-ints", 10) == 0) ||
1864 (strncmp(str, "allow_ints", 10) == 0))
1865 apm_info.allow_ints = !invert;
1866 if ((strncmp(str, "broken-psr", 10) == 0) ||
1867 (strncmp(str, "broken_psr", 10) == 0))
1868 apm_info.get_power_status_broken = !invert;
1869 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1870 (strncmp(str, "realmode_power_off", 18) == 0))
1871 apm_info.realmode_power_off = !invert;
1872 str = strchr(str, ',');
1873 if (str != NULL)
1874 str += strspn(str, ", \t");
1875 }
1876 return 1;
1877 }
1878
1879 __setup("apm=", apm_setup);
1880 #endif
1881
1882 static struct file_operations apm_bios_fops = {
1883 .owner = THIS_MODULE,
1884 .read = do_read,
1885 .poll = do_poll,
1886 .ioctl = do_ioctl,
1887 .open = do_open,
1888 .release = do_release,
1889 };
1890
1891 static struct miscdevice apm_device = {
1892 APM_MINOR_DEV,
1893 "apm_bios",
1894 &apm_bios_fops
1895 };
1896
1897
1898 /* Simple "print if true" callback */
1899 static int __init print_if_true(struct dmi_system_id *d)
1900 {
1901 printk("%s\n", d->ident);
1902 return 0;
1903 }
1904
1905 /*
1906 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1907 * disabled before the suspend. Linux used to get terribly confused by that.
1908 */
1909 static int __init broken_ps2_resume(struct dmi_system_id *d)
1910 {
1911 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug workaround hopefully not needed.\n", d->ident);
1912 return 0;
1913 }
1914
1915 /* Some bioses have a broken protected mode poweroff and need to use realmode */
1916 static int __init set_realmode_power_off(struct dmi_system_id *d)
1917 {
1918 if (apm_info.realmode_power_off == 0) {
1919 apm_info.realmode_power_off = 1;
1920 printk(KERN_INFO "%s bios detected. Using realmode poweroff only.\n", d->ident);
1921 }
1922 return 0;
1923 }
1924
1925 /* Some laptops require interrupts to be enabled during APM calls */
1926 static int __init set_apm_ints(struct dmi_system_id *d)
1927 {
1928 if (apm_info.allow_ints == 0) {
1929 apm_info.allow_ints = 1;
1930 printk(KERN_INFO "%s machine detected. Enabling interrupts during APM calls.\n", d->ident);
1931 }
1932 return 0;
1933 }
1934
1935 /* Some APM bioses corrupt memory or just plain do not work */
1936 static int __init apm_is_horked(struct dmi_system_id *d)
1937 {
1938 if (apm_info.disabled == 0) {
1939 apm_info.disabled = 1;
1940 printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
1941 }
1942 return 0;
1943 }
1944
1945 static int __init apm_is_horked_d850md(struct dmi_system_id *d)
1946 {
1947 if (apm_info.disabled == 0) {
1948 apm_info.disabled = 1;
1949 printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
1950 printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n");
1951 printk(KERN_INFO "download from support.intel.com \n");
1952 }
1953 return 0;
1954 }
1955
1956 /* Some APM bioses hang on APM idle calls */
1957 static int __init apm_likes_to_melt(struct dmi_system_id *d)
1958 {
1959 if (apm_info.forbid_idle == 0) {
1960 apm_info.forbid_idle = 1;
1961 printk(KERN_INFO "%s machine detected. Disabling APM idle calls.\n", d->ident);
1962 }
1963 return 0;
1964 }
1965
1966 /*
1967 * Check for clue free BIOS implementations who use
1968 * the following QA technique
1969 *
1970 * [ Write BIOS Code ]<------
1971 * | ^
1972 * < Does it Compile >----N--
1973 * |Y ^
1974 * < Does it Boot Win98 >-N--
1975 * |Y
1976 * [Ship It]
1977 *
1978 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
1979 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
1980 */
1981 static int __init broken_apm_power(struct dmi_system_id *d)
1982 {
1983 apm_info.get_power_status_broken = 1;
1984 printk(KERN_WARNING "BIOS strings suggest APM bugs, disabling power status reporting.\n");
1985 return 0;
1986 }
1987
1988 /*
1989 * This bios swaps the APM minute reporting bytes over (Many sony laptops
1990 * have this problem).
1991 */
1992 static int __init swab_apm_power_in_minutes(struct dmi_system_id *d)
1993 {
1994 apm_info.get_power_status_swabinminutes = 1;
1995 printk(KERN_WARNING "BIOS strings suggest APM reports battery life in minutes and wrong byte order.\n");
1996 return 0;
1997 }
1998
1999 static struct dmi_system_id __initdata apm_dmi_table[] = {
2000 {
2001 print_if_true,
2002 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2003 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2004 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2005 },
2006 { /* Handle problems with APM on the C600 */
2007 broken_ps2_resume, "Dell Latitude C600",
2008 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2009 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2010 },
2011 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2012 set_apm_ints, "Dell Latitude",
2013 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2014 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2015 },
2016 { /* APM crashes */
2017 apm_is_horked, "Dell Inspiron 2500",
2018 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2019 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2020 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
2021 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2022 },
2023 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2024 set_apm_ints, "Dell Inspiron", {
2025 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2026 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2027 },
2028 { /* Handle problems with APM on Inspiron 5000e */
2029 broken_apm_power, "Dell Inspiron 5000e",
2030 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2031 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2032 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2033 },
2034 { /* Handle problems with APM on Inspiron 2500 */
2035 broken_apm_power, "Dell Inspiron 2500",
2036 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2037 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2038 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2039 },
2040 { /* APM crashes */
2041 apm_is_horked, "Dell Dimension 4100",
2042 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2043 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2044 DMI_MATCH(DMI_BIOS_VENDOR,"Intel Corp."),
2045 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2046 },
2047 { /* Allow interrupts during suspend on Compaq Laptops*/
2048 set_apm_ints, "Compaq 12XL125",
2049 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2050 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2051 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2052 DMI_MATCH(DMI_BIOS_VERSION,"4.06"), },
2053 },
2054 { /* Allow interrupts during APM or the clock goes slow */
2055 set_apm_ints, "ASUSTeK",
2056 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2057 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2058 },
2059 { /* APM blows on shutdown */
2060 apm_is_horked, "ABIT KX7-333[R]",
2061 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2062 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2063 },
2064 { /* APM crashes */
2065 apm_is_horked, "Trigem Delhi3",
2066 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2067 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2068 },
2069 { /* APM crashes */
2070 apm_is_horked, "Fujitsu-Siemens",
2071 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2072 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2073 },
2074 { /* APM crashes */
2075 apm_is_horked_d850md, "Intel D850MD",
2076 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2077 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2078 },
2079 { /* APM crashes */
2080 apm_is_horked, "Intel D810EMO",
2081 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2082 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2083 },
2084 { /* APM crashes */
2085 apm_is_horked, "Dell XPS-Z",
2086 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2087 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2088 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2089 },
2090 { /* APM crashes */
2091 apm_is_horked, "Sharp PC-PJ/AX",
2092 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2093 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2094 DMI_MATCH(DMI_BIOS_VENDOR,"SystemSoft"),
2095 DMI_MATCH(DMI_BIOS_VERSION,"Version R2.08"), },
2096 },
2097 { /* APM crashes */
2098 apm_is_horked, "Dell Inspiron 2500",
2099 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2100 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2101 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
2102 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2103 },
2104 { /* APM idle hangs */
2105 apm_likes_to_melt, "Jabil AMD",
2106 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2107 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2108 },
2109 { /* APM idle hangs */
2110 apm_likes_to_melt, "AMI Bios",
2111 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2112 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2113 },
2114 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2115 swab_apm_power_in_minutes, "Sony VAIO",
2116 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2117 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2118 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2119 },
2120 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2121 swab_apm_power_in_minutes, "Sony VAIO",
2122 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2123 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2124 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2125 },
2126 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2127 swab_apm_power_in_minutes, "Sony VAIO",
2128 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2129 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2130 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
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, "R0121Z1"),
2136 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2137 },
2138 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2139 swab_apm_power_in_minutes, "Sony VAIO",
2140 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2141 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2142 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2143 },
2144 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2145 swab_apm_power_in_minutes, "Sony VAIO",
2146 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2147 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2148 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
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, "R0203D0"),
2154 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2155 },
2156 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2157 swab_apm_power_in_minutes, "Sony VAIO",
2158 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2159 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2160 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2161 },
2162 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2163 swab_apm_power_in_minutes, "Sony VAIO",
2164 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2165 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2166 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2167 },
2168 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2169 swab_apm_power_in_minutes, "Sony VAIO",
2170 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2171 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2172 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2173 },
2174
2175 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2176 swab_apm_power_in_minutes, "Sony VAIO",
2177 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2178 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2179 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
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, "R0204P1"),
2185 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2186 },
2187 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2188 swab_apm_power_in_minutes, "Sony VAIO",
2189 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2190 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2191 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2192 },
2193 { /* broken PM poweroff bios */
2194 set_realmode_power_off, "Award Software v4.60 PGMA",
2195 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2196 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2197 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2198 },
2199
2200 /* Generic per vendor APM settings */
2201
2202 { /* Allow interrupts during suspend on IBM laptops */
2203 set_apm_ints, "IBM",
2204 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2205 },
2206
2207 { }
2208 };
2209
2210 /*
2211 * Just start the APM thread. We do NOT want to do APM BIOS
2212 * calls from anything but the APM thread, if for no other reason
2213 * than the fact that we don't trust the APM BIOS. This way,
2214 * most common APM BIOS problems that lead to protection errors
2215 * etc will have at least some level of being contained...
2216 *
2217 * In short, if something bad happens, at least we have a choice
2218 * of just killing the apm thread..
2219 */
2220 static int __init apm_init(void)
2221 {
2222 struct proc_dir_entry *apm_proc;
2223 int ret;
2224 int i;
2225
2226 dmi_check_system(apm_dmi_table);
2227
2228 if (apm_info.bios.version == 0) {
2229 printk(KERN_INFO "apm: BIOS not found.\n");
2230 return -ENODEV;
2231 }
2232 printk(KERN_INFO
2233 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2234 ((apm_info.bios.version >> 8) & 0xff),
2235 (apm_info.bios.version & 0xff),
2236 apm_info.bios.flags,
2237 driver_version);
2238 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2239 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2240 return -ENODEV;
2241 }
2242
2243 if (allow_ints)
2244 apm_info.allow_ints = 1;
2245 if (broken_psr)
2246 apm_info.get_power_status_broken = 1;
2247 if (realmode_power_off)
2248 apm_info.realmode_power_off = 1;
2249 /* User can override, but default is to trust DMI */
2250 if (apm_disabled != -1)
2251 apm_info.disabled = apm_disabled;
2252
2253 /*
2254 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2255 * but is reportedly a 1.0 BIOS.
2256 */
2257 if (apm_info.bios.version == 0x001)
2258 apm_info.bios.version = 0x100;
2259
2260 /* BIOS < 1.2 doesn't set cseg_16_len */
2261 if (apm_info.bios.version < 0x102)
2262 apm_info.bios.cseg_16_len = 0; /* 64k */
2263
2264 if (debug) {
2265 printk(KERN_INFO "apm: entry %x:%lx cseg16 %x dseg %x",
2266 apm_info.bios.cseg, apm_info.bios.offset,
2267 apm_info.bios.cseg_16, apm_info.bios.dseg);
2268 if (apm_info.bios.version > 0x100)
2269 printk(" cseg len %x, dseg len %x",
2270 apm_info.bios.cseg_len,
2271 apm_info.bios.dseg_len);
2272 if (apm_info.bios.version > 0x101)
2273 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2274 printk("\n");
2275 }
2276
2277 if (apm_info.disabled) {
2278 printk(KERN_NOTICE "apm: disabled on user request.\n");
2279 return -ENODEV;
2280 }
2281 if ((num_online_cpus() > 1) && !power_off && !smp) {
2282 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2283 apm_info.disabled = 1;
2284 return -ENODEV;
2285 }
2286 if (PM_IS_ACTIVE()) {
2287 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2288 apm_info.disabled = 1;
2289 return -ENODEV;
2290 }
2291 pm_active = 1;
2292
2293 /*
2294 * Set up a segment that references the real mode segment 0x40
2295 * that extends up to the end of page zero (that we have reserved).
2296 * This is for buggy BIOS's that refer to (real mode) segment 0x40
2297 * even though they are called in protected mode.
2298 */
2299 set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
2300 _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
2301
2302 apm_bios_entry.offset = apm_info.bios.offset;
2303 apm_bios_entry.segment = APM_CS;
2304
2305 for (i = 0; i < NR_CPUS; i++) {
2306 set_base(per_cpu(cpu_gdt_table, i)[APM_CS >> 3],
2307 __va((unsigned long)apm_info.bios.cseg << 4));
2308 set_base(per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3],
2309 __va((unsigned long)apm_info.bios.cseg_16 << 4));
2310 set_base(per_cpu(cpu_gdt_table, i)[APM_DS >> 3],
2311 __va((unsigned long)apm_info.bios.dseg << 4));
2312 #ifndef APM_RELAX_SEGMENTS
2313 if (apm_info.bios.version == 0x100) {
2314 #endif
2315 /* For ASUS motherboard, Award BIOS rev 110 (and others?) */
2316 _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3], 64 * 1024 - 1);
2317 /* For some unknown machine. */
2318 _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3], 64 * 1024 - 1);
2319 /* For the DEC Hinote Ultra CT475 (and others?) */
2320 _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_DS >> 3], 64 * 1024 - 1);
2321 #ifndef APM_RELAX_SEGMENTS
2322 } else {
2323 _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3],
2324 (apm_info.bios.cseg_len - 1) & 0xffff);
2325 _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3],
2326 (apm_info.bios.cseg_16_len - 1) & 0xffff);
2327 _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_DS >> 3],
2328 (apm_info.bios.dseg_len - 1) & 0xffff);
2329 /* workaround for broken BIOSes */
2330 if (apm_info.bios.cseg_len <= apm_info.bios.offset)
2331 _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3], 64 * 1024 -1);
2332 if (apm_info.bios.dseg_len <= 0x40) { /* 0x40 * 4kB == 64kB */
2333 /* for the BIOS that assumes granularity = 1 */
2334 per_cpu(cpu_gdt_table, i)[APM_DS >> 3].b |= 0x800000;
2335 printk(KERN_NOTICE "apm: we set the granularity of dseg.\n");
2336 }
2337 }
2338 #endif
2339 }
2340
2341 apm_proc = create_proc_info_entry("apm", 0, NULL, apm_get_info);
2342 if (apm_proc)
2343 apm_proc->owner = THIS_MODULE;
2344
2345 ret = kernel_thread(apm, NULL, CLONE_KERNEL | SIGCHLD);
2346 if (ret < 0) {
2347 printk(KERN_ERR "apm: disabled - Unable to start kernel thread.\n");
2348 return -ENOMEM;
2349 }
2350
2351 if (num_online_cpus() > 1 && !smp ) {
2352 printk(KERN_NOTICE
2353 "apm: disabled - APM is not SMP safe (power off active).\n");
2354 return 0;
2355 }
2356
2357 misc_register(&apm_device);
2358
2359 if (HZ != 100)
2360 idle_period = (idle_period * HZ) / 100;
2361 if (idle_threshold < 100) {
2362 original_pm_idle = pm_idle;
2363 pm_idle = apm_cpu_idle;
2364 set_pm_idle = 1;
2365 }
2366
2367 return 0;
2368 }
2369
2370 static void __exit apm_exit(void)
2371 {
2372 int error;
2373
2374 if (set_pm_idle) {
2375 pm_idle = original_pm_idle;
2376 /*
2377 * We are about to unload the current idle thread pm callback
2378 * (pm_idle), Wait for all processors to update cached/local
2379 * copies of pm_idle before proceeding.
2380 */
2381 cpu_idle_wait();
2382 }
2383 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2384 && (apm_info.connection_version > 0x0100)) {
2385 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2386 if (error)
2387 apm_error("disengage power management", error);
2388 }
2389 misc_deregister(&apm_device);
2390 remove_proc_entry("apm", NULL);
2391 if (power_off)
2392 pm_power_off = NULL;
2393 exit_kapmd = 1;
2394 while (kapmd_running)
2395 schedule();
2396 pm_active = 0;
2397 }
2398
2399 module_init(apm_init);
2400 module_exit(apm_exit);
2401
2402 MODULE_AUTHOR("Stephen Rothwell");
2403 MODULE_DESCRIPTION("Advanced Power Management");
2404 MODULE_LICENSE("GPL");
2405 module_param(debug, bool, 0644);
2406 MODULE_PARM_DESC(debug, "Enable debug mode");
2407 module_param(power_off, bool, 0444);
2408 MODULE_PARM_DESC(power_off, "Enable power off");
2409 module_param(bounce_interval, int, 0444);
2410 MODULE_PARM_DESC(bounce_interval,
2411 "Set the number of ticks to ignore suspend bounces");
2412 module_param(allow_ints, bool, 0444);
2413 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2414 module_param(broken_psr, bool, 0444);
2415 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2416 module_param(realmode_power_off, bool, 0444);
2417 MODULE_PARM_DESC(realmode_power_off,
2418 "Switch to real mode before powering off");
2419 module_param(idle_threshold, int, 0444);
2420 MODULE_PARM_DESC(idle_threshold,
2421 "System idle percentage above which to make APM BIOS idle calls");
2422 module_param(idle_period, int, 0444);
2423 MODULE_PARM_DESC(idle_period,
2424 "Period (in sec/100) over which to caculate the idle percentage");
2425 module_param(smp, bool, 0444);
2426 MODULE_PARM_DESC(smp,
2427 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2428 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
linux-next