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 <jdthood@mail.com>)
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 <jdthood@mail.com>)
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 device_power_down(PMSG_SUSPEND);
1206
1207 /* serialize with the timer interrupt */
1208 write_seqlock_irq(&xtime_lock);
1209
1210 /* protect against access to timer chip registers */
1211 spin_lock(&i8253_lock);
1212
1213 get_time_diff();
1214 /*
1215 * Irq spinlock must be dropped around set_system_power_state.
1216 * We'll undo any timer changes due to interrupts below.
1217 */
1218 spin_unlock(&i8253_lock);
1219 write_sequnlock_irq(&xtime_lock);
1220
1221 save_processor_state();
1222 err = set_system_power_state(APM_STATE_SUSPEND);
1223 restore_processor_state();
1224
1225 write_seqlock_irq(&xtime_lock);
1226 spin_lock(&i8253_lock);
1227 reinit_timer();
1228 set_time();
1229 ignore_normal_resume = 1;
1230
1231 spin_unlock(&i8253_lock);
1232 write_sequnlock_irq(&xtime_lock);
1233
1234 if (err == APM_NO_ERROR)
1235 err = APM_SUCCESS;
1236 if (err != APM_SUCCESS)
1237 apm_error("suspend", err);
1238 err = (err == APM_SUCCESS) ? 0 : -EIO;
1239 device_power_up();
1240 device_resume();
1241 pm_send_all(PM_RESUME, (void *)0);
1242 queue_event(APM_NORMAL_RESUME, NULL);
1243 out:
1244 spin_lock(&user_list_lock);
1245 for (as = user_list; as != NULL; as = as->next) {
1246 as->suspend_wait = 0;
1247 as->suspend_result = err;
1248 }
1249 spin_unlock(&user_list_lock);
1250 wake_up_interruptible(&apm_suspend_waitqueue);
1251 return err;
1252 }
1253
1254 static void standby(void)
1255 {
1256 int err;
1257
1258 device_power_down(PMSG_SUSPEND);
1259 /* serialize with the timer interrupt */
1260 write_seqlock_irq(&xtime_lock);
1261 /* If needed, notify drivers here */
1262 get_time_diff();
1263 write_sequnlock_irq(&xtime_lock);
1264
1265 err = set_system_power_state(APM_STATE_STANDBY);
1266 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1267 apm_error("standby", err);
1268 device_power_up();
1269 }
1270
1271 static apm_event_t get_event(void)
1272 {
1273 int error;
1274 apm_event_t event;
1275 apm_eventinfo_t info;
1276
1277 static int notified;
1278
1279 /* we don't use the eventinfo */
1280 error = apm_get_event(&event, &info);
1281 if (error == APM_SUCCESS)
1282 return event;
1283
1284 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1285 apm_error("get_event", error);
1286
1287 return 0;
1288 }
1289
1290 static void check_events(void)
1291 {
1292 apm_event_t event;
1293 static unsigned long last_resume;
1294 static int ignore_bounce;
1295
1296 while ((event = get_event()) != 0) {
1297 if (debug) {
1298 if (event <= NR_APM_EVENT_NAME)
1299 printk(KERN_DEBUG "apm: received %s notify\n",
1300 apm_event_name[event - 1]);
1301 else
1302 printk(KERN_DEBUG "apm: received unknown "
1303 "event 0x%02x\n", event);
1304 }
1305 if (ignore_bounce
1306 && ((jiffies - last_resume) > bounce_interval))
1307 ignore_bounce = 0;
1308
1309 switch (event) {
1310 case APM_SYS_STANDBY:
1311 case APM_USER_STANDBY:
1312 queue_event(event, NULL);
1313 if (standbys_pending <= 0)
1314 standby();
1315 break;
1316
1317 case APM_USER_SUSPEND:
1318 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1319 if (apm_info.connection_version > 0x100)
1320 set_system_power_state(APM_STATE_REJECT);
1321 break;
1322 #endif
1323 case APM_SYS_SUSPEND:
1324 if (ignore_bounce) {
1325 if (apm_info.connection_version > 0x100)
1326 set_system_power_state(APM_STATE_REJECT);
1327 break;
1328 }
1329 /*
1330 * If we are already processing a SUSPEND,
1331 * then further SUSPEND events from the BIOS
1332 * will be ignored. We also return here to
1333 * cope with the fact that the Thinkpads keep
1334 * sending a SUSPEND event until something else
1335 * happens!
1336 */
1337 if (ignore_sys_suspend)
1338 return;
1339 ignore_sys_suspend = 1;
1340 queue_event(event, NULL);
1341 if (suspends_pending <= 0)
1342 (void) suspend(1);
1343 break;
1344
1345 case APM_NORMAL_RESUME:
1346 case APM_CRITICAL_RESUME:
1347 case APM_STANDBY_RESUME:
1348 ignore_sys_suspend = 0;
1349 last_resume = jiffies;
1350 ignore_bounce = 1;
1351 if ((event != APM_NORMAL_RESUME)
1352 || (ignore_normal_resume == 0)) {
1353 write_seqlock_irq(&xtime_lock);
1354 set_time();
1355 write_sequnlock_irq(&xtime_lock);
1356 device_resume();
1357 pm_send_all(PM_RESUME, (void *)0);
1358 queue_event(event, NULL);
1359 }
1360 ignore_normal_resume = 0;
1361 break;
1362
1363 case APM_CAPABILITY_CHANGE:
1364 case APM_LOW_BATTERY:
1365 case APM_POWER_STATUS_CHANGE:
1366 queue_event(event, NULL);
1367 /* If needed, notify drivers here */
1368 break;
1369
1370 case APM_UPDATE_TIME:
1371 write_seqlock_irq(&xtime_lock);
1372 set_time();
1373 write_sequnlock_irq(&xtime_lock);
1374 break;
1375
1376 case APM_CRITICAL_SUSPEND:
1377 /*
1378 * We are not allowed to reject a critical suspend.
1379 */
1380 (void) suspend(0);
1381 break;
1382 }
1383 }
1384 }
1385
1386 static void apm_event_handler(void)
1387 {
1388 static int pending_count = 4;
1389 int err;
1390
1391 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1392 if ((apm_info.connection_version > 0x100) &&
1393 (pending_count-- <= 0)) {
1394 pending_count = 4;
1395 if (debug)
1396 printk(KERN_DEBUG "apm: setting state busy\n");
1397 err = set_system_power_state(APM_STATE_BUSY);
1398 if (err)
1399 apm_error("busy", err);
1400 }
1401 } else
1402 pending_count = 4;
1403 check_events();
1404 }
1405
1406 /*
1407 * This is the APM thread main loop.
1408 */
1409
1410 static void apm_mainloop(void)
1411 {
1412 DECLARE_WAITQUEUE(wait, current);
1413
1414 add_wait_queue(&apm_waitqueue, &wait);
1415 set_current_state(TASK_INTERRUPTIBLE);
1416 for (;;) {
1417 schedule_timeout(APM_CHECK_TIMEOUT);
1418 if (exit_kapmd)
1419 break;
1420 /*
1421 * Ok, check all events, check for idle (and mark us sleeping
1422 * so as not to count towards the load average)..
1423 */
1424 set_current_state(TASK_INTERRUPTIBLE);
1425 apm_event_handler();
1426 }
1427 remove_wait_queue(&apm_waitqueue, &wait);
1428 }
1429
1430 static int check_apm_user(struct apm_user *as, const char *func)
1431 {
1432 if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) {
1433 printk(KERN_ERR "apm: %s passed bad filp\n", func);
1434 return 1;
1435 }
1436 return 0;
1437 }
1438
1439 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1440 {
1441 struct apm_user * as;
1442 int i;
1443 apm_event_t event;
1444
1445 as = fp->private_data;
1446 if (check_apm_user(as, "read"))
1447 return -EIO;
1448 if ((int)count < sizeof(apm_event_t))
1449 return -EINVAL;
1450 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1451 return -EAGAIN;
1452 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1453 i = count;
1454 while ((i >= sizeof(event)) && !queue_empty(as)) {
1455 event = get_queued_event(as);
1456 if (copy_to_user(buf, &event, sizeof(event))) {
1457 if (i < count)
1458 break;
1459 return -EFAULT;
1460 }
1461 switch (event) {
1462 case APM_SYS_SUSPEND:
1463 case APM_USER_SUSPEND:
1464 as->suspends_read++;
1465 break;
1466
1467 case APM_SYS_STANDBY:
1468 case APM_USER_STANDBY:
1469 as->standbys_read++;
1470 break;
1471 }
1472 buf += sizeof(event);
1473 i -= sizeof(event);
1474 }
1475 if (i < count)
1476 return count - i;
1477 if (signal_pending(current))
1478 return -ERESTARTSYS;
1479 return 0;
1480 }
1481
1482 static unsigned int do_poll(struct file *fp, poll_table * wait)
1483 {
1484 struct apm_user * as;
1485
1486 as = fp->private_data;
1487 if (check_apm_user(as, "poll"))
1488 return 0;
1489 poll_wait(fp, &apm_waitqueue, wait);
1490 if (!queue_empty(as))
1491 return POLLIN | POLLRDNORM;
1492 return 0;
1493 }
1494
1495 static int do_ioctl(struct inode * inode, struct file *filp,
1496 u_int cmd, u_long arg)
1497 {
1498 struct apm_user * as;
1499
1500 as = filp->private_data;
1501 if (check_apm_user(as, "ioctl"))
1502 return -EIO;
1503 if ((!as->suser) || (!as->writer))
1504 return -EPERM;
1505 switch (cmd) {
1506 case APM_IOC_STANDBY:
1507 if (as->standbys_read > 0) {
1508 as->standbys_read--;
1509 as->standbys_pending--;
1510 standbys_pending--;
1511 } else
1512 queue_event(APM_USER_STANDBY, as);
1513 if (standbys_pending <= 0)
1514 standby();
1515 break;
1516 case APM_IOC_SUSPEND:
1517 if (as->suspends_read > 0) {
1518 as->suspends_read--;
1519 as->suspends_pending--;
1520 suspends_pending--;
1521 } else
1522 queue_event(APM_USER_SUSPEND, as);
1523 if (suspends_pending <= 0) {
1524 return suspend(1);
1525 } else {
1526 as->suspend_wait = 1;
1527 wait_event_interruptible(apm_suspend_waitqueue,
1528 as->suspend_wait == 0);
1529 return as->suspend_result;
1530 }
1531 break;
1532 default:
1533 return -EINVAL;
1534 }
1535 return 0;
1536 }
1537
1538 static int do_release(struct inode * inode, struct file * filp)
1539 {
1540 struct apm_user * as;
1541
1542 as = filp->private_data;
1543 if (check_apm_user(as, "release"))
1544 return 0;
1545 filp->private_data = NULL;
1546 if (as->standbys_pending > 0) {
1547 standbys_pending -= as->standbys_pending;
1548 if (standbys_pending <= 0)
1549 standby();
1550 }
1551 if (as->suspends_pending > 0) {
1552 suspends_pending -= as->suspends_pending;
1553 if (suspends_pending <= 0)
1554 (void) suspend(1);
1555 }
1556 spin_lock(&user_list_lock);
1557 if (user_list == as)
1558 user_list = as->next;
1559 else {
1560 struct apm_user * as1;
1561
1562 for (as1 = user_list;
1563 (as1 != NULL) && (as1->next != as);
1564 as1 = as1->next)
1565 ;
1566 if (as1 == NULL)
1567 printk(KERN_ERR "apm: filp not in user list\n");
1568 else
1569 as1->next = as->next;
1570 }
1571 spin_unlock(&user_list_lock);
1572 kfree(as);
1573 return 0;
1574 }
1575
1576 static int do_open(struct inode * inode, struct file * filp)
1577 {
1578 struct apm_user * as;
1579
1580 as = (struct apm_user *)kmalloc(sizeof(*as), GFP_KERNEL);
1581 if (as == NULL) {
1582 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1583 sizeof(*as));
1584 return -ENOMEM;
1585 }
1586 as->magic = APM_BIOS_MAGIC;
1587 as->event_tail = as->event_head = 0;
1588 as->suspends_pending = as->standbys_pending = 0;
1589 as->suspends_read = as->standbys_read = 0;
1590 /*
1591 * XXX - this is a tiny bit broken, when we consider BSD
1592 * process accounting. If the device is opened by root, we
1593 * instantly flag that we used superuser privs. Who knows,
1594 * we might close the device immediately without doing a
1595 * privileged operation -- cevans
1596 */
1597 as->suser = capable(CAP_SYS_ADMIN);
1598 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1599 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1600 spin_lock(&user_list_lock);
1601 as->next = user_list;
1602 user_list = as;
1603 spin_unlock(&user_list_lock);
1604 filp->private_data = as;
1605 return 0;
1606 }
1607
1608 static int apm_get_info(char *buf, char **start, off_t fpos, int length)
1609 {
1610 char * p;
1611 unsigned short bx;
1612 unsigned short cx;
1613 unsigned short dx;
1614 int error;
1615 unsigned short ac_line_status = 0xff;
1616 unsigned short battery_status = 0xff;
1617 unsigned short battery_flag = 0xff;
1618 int percentage = -1;
1619 int time_units = -1;
1620 char *units = "?";
1621
1622 p = buf;
1623
1624 if ((num_online_cpus() == 1) &&
1625 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1626 ac_line_status = (bx >> 8) & 0xff;
1627 battery_status = bx & 0xff;
1628 if ((cx & 0xff) != 0xff)
1629 percentage = cx & 0xff;
1630
1631 if (apm_info.connection_version > 0x100) {
1632 battery_flag = (cx >> 8) & 0xff;
1633 if (dx != 0xffff) {
1634 units = (dx & 0x8000) ? "min" : "sec";
1635 time_units = dx & 0x7fff;
1636 }
1637 }
1638 }
1639 /* Arguments, with symbols from linux/apm_bios.h. Information is
1640 from the Get Power Status (0x0a) call unless otherwise noted.
1641
1642 0) Linux driver version (this will change if format changes)
1643 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1644 2) APM flags from APM Installation Check (0x00):
1645 bit 0: APM_16_BIT_SUPPORT
1646 bit 1: APM_32_BIT_SUPPORT
1647 bit 2: APM_IDLE_SLOWS_CLOCK
1648 bit 3: APM_BIOS_DISABLED
1649 bit 4: APM_BIOS_DISENGAGED
1650 3) AC line status
1651 0x00: Off-line
1652 0x01: On-line
1653 0x02: On backup power (BIOS >= 1.1 only)
1654 0xff: Unknown
1655 4) Battery status
1656 0x00: High
1657 0x01: Low
1658 0x02: Critical
1659 0x03: Charging
1660 0x04: Selected battery not present (BIOS >= 1.2 only)
1661 0xff: Unknown
1662 5) Battery flag
1663 bit 0: High
1664 bit 1: Low
1665 bit 2: Critical
1666 bit 3: Charging
1667 bit 7: No system battery
1668 0xff: Unknown
1669 6) Remaining battery life (percentage of charge):
1670 0-100: valid
1671 -1: Unknown
1672 7) Remaining battery life (time units):
1673 Number of remaining minutes or seconds
1674 -1: Unknown
1675 8) min = minutes; sec = seconds */
1676
1677 p += sprintf(p, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1678 driver_version,
1679 (apm_info.bios.version >> 8) & 0xff,
1680 apm_info.bios.version & 0xff,
1681 apm_info.bios.flags,
1682 ac_line_status,
1683 battery_status,
1684 battery_flag,
1685 percentage,
1686 time_units,
1687 units);
1688
1689 return p - buf;
1690 }
1691
1692 static int apm(void *unused)
1693 {
1694 unsigned short bx;
1695 unsigned short cx;
1696 unsigned short dx;
1697 int error;
1698 char * power_stat;
1699 char * bat_stat;
1700
1701 kapmd_running = 1;
1702
1703 daemonize("kapmd");
1704
1705 current->flags |= PF_NOFREEZE;
1706
1707 #ifdef CONFIG_SMP
1708 /* 2002/08/01 - WT
1709 * This is to avoid random crashes at boot time during initialization
1710 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1711 * Some bioses don't like being called from CPU != 0.
1712 * Method suggested by Ingo Molnar.
1713 */
1714 set_cpus_allowed(current, cpumask_of_cpu(0));
1715 BUG_ON(smp_processor_id() != 0);
1716 #endif
1717
1718 if (apm_info.connection_version == 0) {
1719 apm_info.connection_version = apm_info.bios.version;
1720 if (apm_info.connection_version > 0x100) {
1721 /*
1722 * We only support BIOSs up to version 1.2
1723 */
1724 if (apm_info.connection_version > 0x0102)
1725 apm_info.connection_version = 0x0102;
1726 error = apm_driver_version(&apm_info.connection_version);
1727 if (error != APM_SUCCESS) {
1728 apm_error("driver version", error);
1729 /* Fall back to an APM 1.0 connection. */
1730 apm_info.connection_version = 0x100;
1731 }
1732 }
1733 }
1734
1735 if (debug)
1736 printk(KERN_INFO "apm: Connection version %d.%d\n",
1737 (apm_info.connection_version >> 8) & 0xff,
1738 apm_info.connection_version & 0xff);
1739
1740 #ifdef CONFIG_APM_DO_ENABLE
1741 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1742 /*
1743 * This call causes my NEC UltraLite Versa 33/C to hang if it
1744 * is booted with PM disabled but not in the docking station.
1745 * Unfortunate ...
1746 */
1747 error = apm_enable_power_management(1);
1748 if (error) {
1749 apm_error("enable power management", error);
1750 return -1;
1751 }
1752 }
1753 #endif
1754
1755 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1756 && (apm_info.connection_version > 0x0100)) {
1757 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1758 if (error) {
1759 apm_error("engage power management", error);
1760 return -1;
1761 }
1762 }
1763
1764 if (debug && (num_online_cpus() == 1 || smp )) {
1765 error = apm_get_power_status(&bx, &cx, &dx);
1766 if (error)
1767 printk(KERN_INFO "apm: power status not available\n");
1768 else {
1769 switch ((bx >> 8) & 0xff) {
1770 case 0: power_stat = "off line"; break;
1771 case 1: power_stat = "on line"; break;
1772 case 2: power_stat = "on backup power"; break;
1773 default: power_stat = "unknown"; break;
1774 }
1775 switch (bx & 0xff) {
1776 case 0: bat_stat = "high"; break;
1777 case 1: bat_stat = "low"; break;
1778 case 2: bat_stat = "critical"; break;
1779 case 3: bat_stat = "charging"; break;
1780 default: bat_stat = "unknown"; break;
1781 }
1782 printk(KERN_INFO
1783 "apm: AC %s, battery status %s, battery life ",
1784 power_stat, bat_stat);
1785 if ((cx & 0xff) == 0xff)
1786 printk("unknown\n");
1787 else
1788 printk("%d%%\n", cx & 0xff);
1789 if (apm_info.connection_version > 0x100) {
1790 printk(KERN_INFO
1791 "apm: battery flag 0x%02x, battery life ",
1792 (cx >> 8) & 0xff);
1793 if (dx == 0xffff)
1794 printk("unknown\n");
1795 else
1796 printk("%d %s\n", dx & 0x7fff,
1797 (dx & 0x8000) ?
1798 "minutes" : "seconds");
1799 }
1800 }
1801 }
1802
1803 /* Install our power off handler.. */
1804 if (power_off)
1805 pm_power_off = apm_power_off;
1806
1807 if (num_online_cpus() == 1 || smp) {
1808 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1809 console_blank_hook = apm_console_blank;
1810 #endif
1811 apm_mainloop();
1812 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1813 console_blank_hook = NULL;
1814 #endif
1815 }
1816 kapmd_running = 0;
1817
1818 return 0;
1819 }
1820
1821 #ifndef MODULE
1822 static int __init apm_setup(char *str)
1823 {
1824 int invert;
1825
1826 while ((str != NULL) && (*str != '\0')) {
1827 if (strncmp(str, "off", 3) == 0)
1828 apm_disabled = 1;
1829 if (strncmp(str, "on", 2) == 0)
1830 apm_disabled = 0;
1831 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1832 (strncmp(str, "bounce_interval=", 16) == 0))
1833 bounce_interval = simple_strtol(str + 16, NULL, 0);
1834 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1835 (strncmp(str, "idle_threshold=", 15) == 0))
1836 idle_threshold = simple_strtol(str + 15, NULL, 0);
1837 if ((strncmp(str, "idle-period=", 12) == 0) ||
1838 (strncmp(str, "idle_period=", 12) == 0))
1839 idle_period = simple_strtol(str + 12, NULL, 0);
1840 invert = (strncmp(str, "no-", 3) == 0) ||
1841 (strncmp(str, "no_", 3) == 0);
1842 if (invert)
1843 str += 3;
1844 if (strncmp(str, "debug", 5) == 0)
1845 debug = !invert;
1846 if ((strncmp(str, "power-off", 9) == 0) ||
1847 (strncmp(str, "power_off", 9) == 0))
1848 power_off = !invert;
1849 if (strncmp(str, "smp", 3) == 0)
1850 {
1851 smp = !invert;
1852 idle_threshold = 100;
1853 }
1854 if ((strncmp(str, "allow-ints", 10) == 0) ||
1855 (strncmp(str, "allow_ints", 10) == 0))
1856 apm_info.allow_ints = !invert;
1857 if ((strncmp(str, "broken-psr", 10) == 0) ||
1858 (strncmp(str, "broken_psr", 10) == 0))
1859 apm_info.get_power_status_broken = !invert;
1860 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1861 (strncmp(str, "realmode_power_off", 18) == 0))
1862 apm_info.realmode_power_off = !invert;
1863 str = strchr(str, ',');
1864 if (str != NULL)
1865 str += strspn(str, ", \t");
1866 }
1867 return 1;
1868 }
1869
1870 __setup("apm=", apm_setup);
1871 #endif
1872
1873 static struct file_operations apm_bios_fops = {
1874 .owner = THIS_MODULE,
1875 .read = do_read,
1876 .poll = do_poll,
1877 .ioctl = do_ioctl,
1878 .open = do_open,
1879 .release = do_release,
1880 };
1881
1882 static struct miscdevice apm_device = {
1883 APM_MINOR_DEV,
1884 "apm_bios",
1885 &apm_bios_fops
1886 };
1887
1888
1889 /* Simple "print if true" callback */
1890 static int __init print_if_true(struct dmi_system_id *d)
1891 {
1892 printk("%s\n", d->ident);
1893 return 0;
1894 }
1895
1896 /*
1897 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1898 * disabled before the suspend. Linux used to get terribly confused by that.
1899 */
1900 static int __init broken_ps2_resume(struct dmi_system_id *d)
1901 {
1902 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug workaround hopefully not needed.\n", d->ident);
1903 return 0;
1904 }
1905
1906 /* Some bioses have a broken protected mode poweroff and need to use realmode */
1907 static int __init set_realmode_power_off(struct dmi_system_id *d)
1908 {
1909 if (apm_info.realmode_power_off == 0) {
1910 apm_info.realmode_power_off = 1;
1911 printk(KERN_INFO "%s bios detected. Using realmode poweroff only.\n", d->ident);
1912 }
1913 return 0;
1914 }
1915
1916 /* Some laptops require interrupts to be enabled during APM calls */
1917 static int __init set_apm_ints(struct dmi_system_id *d)
1918 {
1919 if (apm_info.allow_ints == 0) {
1920 apm_info.allow_ints = 1;
1921 printk(KERN_INFO "%s machine detected. Enabling interrupts during APM calls.\n", d->ident);
1922 }
1923 return 0;
1924 }
1925
1926 /* Some APM bioses corrupt memory or just plain do not work */
1927 static int __init apm_is_horked(struct dmi_system_id *d)
1928 {
1929 if (apm_info.disabled == 0) {
1930 apm_info.disabled = 1;
1931 printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
1932 }
1933 return 0;
1934 }
1935
1936 static int __init apm_is_horked_d850md(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 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(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. Disabling APM idle calls.\n", d->ident);
1953 }
1954 return 0;
1955 }
1956
1957 /*
1958 * Check for clue free BIOS implementations who use
1959 * the following QA technique
1960 *
1961 * [ Write BIOS Code ]<------
1962 * | ^
1963 * < Does it Compile >----N--
1964 * |Y ^
1965 * < Does it Boot Win98 >-N--
1966 * |Y
1967 * [Ship It]
1968 *
1969 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
1970 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
1971 */
1972 static int __init broken_apm_power(struct dmi_system_id *d)
1973 {
1974 apm_info.get_power_status_broken = 1;
1975 printk(KERN_WARNING "BIOS strings suggest APM bugs, disabling power status reporting.\n");
1976 return 0;
1977 }
1978
1979 /*
1980 * This bios swaps the APM minute reporting bytes over (Many sony laptops
1981 * have this problem).
1982 */
1983 static int __init swab_apm_power_in_minutes(struct dmi_system_id *d)
1984 {
1985 apm_info.get_power_status_swabinminutes = 1;
1986 printk(KERN_WARNING "BIOS strings suggest APM reports battery life in minutes and wrong byte order.\n");
1987 return 0;
1988 }
1989
1990 static struct dmi_system_id __initdata apm_dmi_table[] = {
1991 {
1992 print_if_true,
1993 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
1994 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
1995 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
1996 },
1997 { /* Handle problems with APM on the C600 */
1998 broken_ps2_resume, "Dell Latitude C600",
1999 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2000 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2001 },
2002 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2003 set_apm_ints, "Dell Latitude",
2004 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2005 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2006 },
2007 { /* APM crashes */
2008 apm_is_horked, "Dell Inspiron 2500",
2009 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2010 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2011 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
2012 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2013 },
2014 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2015 set_apm_ints, "Dell Inspiron", {
2016 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2017 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2018 },
2019 { /* Handle problems with APM on Inspiron 5000e */
2020 broken_apm_power, "Dell Inspiron 5000e",
2021 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2022 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2023 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2024 },
2025 { /* Handle problems with APM on Inspiron 2500 */
2026 broken_apm_power, "Dell Inspiron 2500",
2027 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2028 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2029 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2030 },
2031 { /* APM crashes */
2032 apm_is_horked, "Dell Dimension 4100",
2033 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2034 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2035 DMI_MATCH(DMI_BIOS_VENDOR,"Intel Corp."),
2036 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2037 },
2038 { /* Allow interrupts during suspend on Compaq Laptops*/
2039 set_apm_ints, "Compaq 12XL125",
2040 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2041 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2042 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2043 DMI_MATCH(DMI_BIOS_VERSION,"4.06"), },
2044 },
2045 { /* Allow interrupts during APM or the clock goes slow */
2046 set_apm_ints, "ASUSTeK",
2047 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2048 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2049 },
2050 { /* APM blows on shutdown */
2051 apm_is_horked, "ABIT KX7-333[R]",
2052 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2053 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2054 },
2055 { /* APM crashes */
2056 apm_is_horked, "Trigem Delhi3",
2057 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2058 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2059 },
2060 { /* APM crashes */
2061 apm_is_horked, "Fujitsu-Siemens",
2062 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2063 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2064 },
2065 { /* APM crashes */
2066 apm_is_horked_d850md, "Intel D850MD",
2067 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2068 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2069 },
2070 { /* APM crashes */
2071 apm_is_horked, "Intel D810EMO",
2072 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2073 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2074 },
2075 { /* APM crashes */
2076 apm_is_horked, "Dell XPS-Z",
2077 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2078 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2079 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2080 },
2081 { /* APM crashes */
2082 apm_is_horked, "Sharp PC-PJ/AX",
2083 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2084 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2085 DMI_MATCH(DMI_BIOS_VENDOR,"SystemSoft"),
2086 DMI_MATCH(DMI_BIOS_VERSION,"Version R2.08"), },
2087 },
2088 { /* APM crashes */
2089 apm_is_horked, "Dell Inspiron 2500",
2090 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2091 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2092 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
2093 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2094 },
2095 { /* APM idle hangs */
2096 apm_likes_to_melt, "Jabil AMD",
2097 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2098 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2099 },
2100 { /* APM idle hangs */
2101 apm_likes_to_melt, "AMI Bios",
2102 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2103 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2104 },
2105 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2106 swab_apm_power_in_minutes, "Sony VAIO",
2107 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2108 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2109 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2110 },
2111 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2112 swab_apm_power_in_minutes, "Sony VAIO",
2113 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2114 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2115 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2116 },
2117 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2118 swab_apm_power_in_minutes, "Sony VAIO",
2119 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2120 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2121 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2122 },
2123 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2124 swab_apm_power_in_minutes, "Sony VAIO",
2125 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2126 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2127 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2128 },
2129 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2130 swab_apm_power_in_minutes, "Sony VAIO",
2131 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2132 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2133 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2134 },
2135 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2136 swab_apm_power_in_minutes, "Sony VAIO",
2137 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2138 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2139 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2140 },
2141 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2142 swab_apm_power_in_minutes, "Sony VAIO",
2143 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2144 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2145 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2146 },
2147 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2148 swab_apm_power_in_minutes, "Sony VAIO",
2149 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2150 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2151 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2152 },
2153 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2154 swab_apm_power_in_minutes, "Sony VAIO",
2155 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2156 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2157 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2158 },
2159 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2160 swab_apm_power_in_minutes, "Sony VAIO",
2161 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2162 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2163 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2164 },
2165
2166 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2167 swab_apm_power_in_minutes, "Sony VAIO",
2168 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2169 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2170 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2171 },
2172 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2173 swab_apm_power_in_minutes, "Sony VAIO",
2174 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2175 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2176 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2177 },
2178 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2179 swab_apm_power_in_minutes, "Sony VAIO",
2180 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2181 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2182 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2183 },
2184 { /* broken PM poweroff bios */
2185 set_realmode_power_off, "Award Software v4.60 PGMA",
2186 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2187 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2188 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2189 },
2190
2191 /* Generic per vendor APM settings */
2192
2193 { /* Allow interrupts during suspend on IBM laptops */
2194 set_apm_ints, "IBM",
2195 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2196 },
2197
2198 { }
2199 };
2200
2201 /*
2202 * Just start the APM thread. We do NOT want to do APM BIOS
2203 * calls from anything but the APM thread, if for no other reason
2204 * than the fact that we don't trust the APM BIOS. This way,
2205 * most common APM BIOS problems that lead to protection errors
2206 * etc will have at least some level of being contained...
2207 *
2208 * In short, if something bad happens, at least we have a choice
2209 * of just killing the apm thread..
2210 */
2211 static int __init apm_init(void)
2212 {
2213 struct proc_dir_entry *apm_proc;
2214 int ret;
2215 int i;
2216
2217 dmi_check_system(apm_dmi_table);
2218
2219 if (apm_info.bios.version == 0) {
2220 printk(KERN_INFO "apm: BIOS not found.\n");
2221 return -ENODEV;
2222 }
2223 printk(KERN_INFO
2224 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2225 ((apm_info.bios.version >> 8) & 0xff),
2226 (apm_info.bios.version & 0xff),
2227 apm_info.bios.flags,
2228 driver_version);
2229 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2230 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2231 return -ENODEV;
2232 }
2233
2234 if (allow_ints)
2235 apm_info.allow_ints = 1;
2236 if (broken_psr)
2237 apm_info.get_power_status_broken = 1;
2238 if (realmode_power_off)
2239 apm_info.realmode_power_off = 1;
2240 /* User can override, but default is to trust DMI */
2241 if (apm_disabled != -1)
2242 apm_info.disabled = apm_disabled;
2243
2244 /*
2245 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2246 * but is reportedly a 1.0 BIOS.
2247 */
2248 if (apm_info.bios.version == 0x001)
2249 apm_info.bios.version = 0x100;
2250
2251 /* BIOS < 1.2 doesn't set cseg_16_len */
2252 if (apm_info.bios.version < 0x102)
2253 apm_info.bios.cseg_16_len = 0; /* 64k */
2254
2255 if (debug) {
2256 printk(KERN_INFO "apm: entry %x:%lx cseg16 %x dseg %x",
2257 apm_info.bios.cseg, apm_info.bios.offset,
2258 apm_info.bios.cseg_16, apm_info.bios.dseg);
2259 if (apm_info.bios.version > 0x100)
2260 printk(" cseg len %x, dseg len %x",
2261 apm_info.bios.cseg_len,
2262 apm_info.bios.dseg_len);
2263 if (apm_info.bios.version > 0x101)
2264 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2265 printk("\n");
2266 }
2267
2268 if (apm_info.disabled) {
2269 printk(KERN_NOTICE "apm: disabled on user request.\n");
2270 return -ENODEV;
2271 }
2272 if ((num_online_cpus() > 1) && !power_off && !smp) {
2273 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2274 apm_info.disabled = 1;
2275 return -ENODEV;
2276 }
2277 if (PM_IS_ACTIVE()) {
2278 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2279 apm_info.disabled = 1;
2280 return -ENODEV;
2281 }
2282 pm_active = 1;
2283
2284 /*
2285 * Set up a segment that references the real mode segment 0x40
2286 * that extends up to the end of page zero (that we have reserved).
2287 * This is for buggy BIOS's that refer to (real mode) segment 0x40
2288 * even though they are called in protected mode.
2289 */
2290 set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
2291 _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
2292
2293 apm_bios_entry.offset = apm_info.bios.offset;
2294 apm_bios_entry.segment = APM_CS;
2295
2296 for (i = 0; i < NR_CPUS; i++) {
2297 set_base(per_cpu(cpu_gdt_table, i)[APM_CS >> 3],
2298 __va((unsigned long)apm_info.bios.cseg << 4));
2299 set_base(per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3],
2300 __va((unsigned long)apm_info.bios.cseg_16 << 4));
2301 set_base(per_cpu(cpu_gdt_table, i)[APM_DS >> 3],
2302 __va((unsigned long)apm_info.bios.dseg << 4));
2303 #ifndef APM_RELAX_SEGMENTS
2304 if (apm_info.bios.version == 0x100) {
2305 #endif
2306 /* For ASUS motherboard, Award BIOS rev 110 (and others?) */
2307 _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3], 64 * 1024 - 1);
2308 /* For some unknown machine. */
2309 _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3], 64 * 1024 - 1);
2310 /* For the DEC Hinote Ultra CT475 (and others?) */
2311 _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_DS >> 3], 64 * 1024 - 1);
2312 #ifndef APM_RELAX_SEGMENTS
2313 } else {
2314 _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3],
2315 (apm_info.bios.cseg_len - 1) & 0xffff);
2316 _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3],
2317 (apm_info.bios.cseg_16_len - 1) & 0xffff);
2318 _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_DS >> 3],
2319 (apm_info.bios.dseg_len - 1) & 0xffff);
2320 /* workaround for broken BIOSes */
2321 if (apm_info.bios.cseg_len <= apm_info.bios.offset)
2322 _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3], 64 * 1024 -1);
2323 if (apm_info.bios.dseg_len <= 0x40) { /* 0x40 * 4kB == 64kB */
2324 /* for the BIOS that assumes granularity = 1 */
2325 per_cpu(cpu_gdt_table, i)[APM_DS >> 3].b |= 0x800000;
2326 printk(KERN_NOTICE "apm: we set the granularity of dseg.\n");
2327 }
2328 }
2329 #endif
2330 }
2331
2332 apm_proc = create_proc_info_entry("apm", 0, NULL, apm_get_info);
2333 if (apm_proc)
2334 apm_proc->owner = THIS_MODULE;
2335
2336 ret = kernel_thread(apm, NULL, CLONE_KERNEL | SIGCHLD);
2337 if (ret < 0) {
2338 printk(KERN_ERR "apm: disabled - Unable to start kernel thread.\n");
2339 return -ENOMEM;
2340 }
2341
2342 if (num_online_cpus() > 1 && !smp ) {
2343 printk(KERN_NOTICE
2344 "apm: disabled - APM is not SMP safe (power off active).\n");
2345 return 0;
2346 }
2347
2348 misc_register(&apm_device);
2349
2350 if (HZ != 100)
2351 idle_period = (idle_period * HZ) / 100;
2352 if (idle_threshold < 100) {
2353 original_pm_idle = pm_idle;
2354 pm_idle = apm_cpu_idle;
2355 set_pm_idle = 1;
2356 }
2357
2358 return 0;
2359 }
2360
2361 static void __exit apm_exit(void)
2362 {
2363 int error;
2364
2365 if (set_pm_idle) {
2366 pm_idle = original_pm_idle;
2367 /*
2368 * We are about to unload the current idle thread pm callback
2369 * (pm_idle), Wait for all processors to update cached/local
2370 * copies of pm_idle before proceeding.
2371 */
2372 cpu_idle_wait();
2373 }
2374 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2375 && (apm_info.connection_version > 0x0100)) {
2376 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2377 if (error)
2378 apm_error("disengage power management", error);
2379 }
2380 misc_deregister(&apm_device);
2381 remove_proc_entry("apm", NULL);
2382 if (power_off)
2383 pm_power_off = NULL;
2384 exit_kapmd = 1;
2385 while (kapmd_running)
2386 schedule();
2387 pm_active = 0;
2388 }
2389
2390 module_init(apm_init);
2391 module_exit(apm_exit);
2392
2393 MODULE_AUTHOR("Stephen Rothwell");
2394 MODULE_DESCRIPTION("Advanced Power Management");
2395 MODULE_LICENSE("GPL");
2396 module_param(debug, bool, 0644);
2397 MODULE_PARM_DESC(debug, "Enable debug mode");
2398 module_param(power_off, bool, 0444);
2399 MODULE_PARM_DESC(power_off, "Enable power off");
2400 module_param(bounce_interval, int, 0444);
2401 MODULE_PARM_DESC(bounce_interval,
2402 "Set the number of ticks to ignore suspend bounces");
2403 module_param(allow_ints, bool, 0444);
2404 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2405 module_param(broken_psr, bool, 0444);
2406 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2407 module_param(realmode_power_off, bool, 0444);
2408 MODULE_PARM_DESC(realmode_power_off,
2409 "Switch to real mode before powering off");
2410 module_param(idle_threshold, int, 0444);
2411 MODULE_PARM_DESC(idle_threshold,
2412 "System idle percentage above which to make APM BIOS idle calls");
2413 module_param(idle_period, int, 0444);
2414 MODULE_PARM_DESC(idle_period,
2415 "Period (in sec/100) over which to caculate the idle percentage");
2416 module_param(smp, bool, 0444);
2417 MODULE_PARM_DESC(smp,
2418 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2419 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
2420
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