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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / arch / x86 / kernel / apm_32.c
blobd4438ef296d8a607f7a703a845040715a8335fd9
1 /* -*- linux-c -*-
2 * APM BIOS driver for Linux
3 * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
4 *
5 * Initial development of this driver was funded by NEC Australia P/L
6 * and NEC Corporation
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2, or (at your option) any
11 * later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * October 1995, Rik Faith (faith@cs.unc.edu):
19 * Minor enhancements and updates (to the patch set) for 1.3.x
20 * Documentation
21 * January 1996, Rik Faith (faith@cs.unc.edu):
22 * Make /proc/apm easy to format (bump driver version)
23 * March 1996, Rik Faith (faith@cs.unc.edu):
24 * Prohibit APM BIOS calls unless apm_enabled.
25 * (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>)
26 * April 1996, Stephen Rothwell (sfr@canb.auug.org.au)
27 * Version 1.0 and 1.1
28 * May 1996, Version 1.2
29 * Feb 1998, Version 1.3
30 * Feb 1998, Version 1.4
31 * Aug 1998, Version 1.5
32 * Sep 1998, Version 1.6
33 * Nov 1998, Version 1.7
34 * Jan 1999, Version 1.8
35 * Jan 1999, Version 1.9
36 * Oct 1999, Version 1.10
37 * Nov 1999, Version 1.11
38 * Jan 2000, Version 1.12
39 * Feb 2000, Version 1.13
40 * Nov 2000, Version 1.14
41 * Oct 2001, Version 1.15
42 * Jan 2002, Version 1.16
43 * Oct 2002, Version 1.16ac
44 *
45 * History:
46 * 0.6b: first version in official kernel, Linux 1.3.46
47 * 0.7: changed /proc/apm format, Linux 1.3.58
48 * 0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59
49 * 0.9: only call bios if bios is present, Linux 1.3.72
50 * 1.0: use fixed device number, consolidate /proc/apm into this file,
51 * Linux 1.3.85
52 * 1.1: support user-space standby and suspend, power off after system
53 * halted, Linux 1.3.98
54 * 1.2: When resetting RTC after resume, take care so that the time
55 * is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
56 * <jtoth@princeton.edu>); improve interaction between
57 * screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
58 * 1.2a:Simple change to stop mysterious bug reports with SMP also added
59 * levels to the printk calls. APM is not defined for SMP machines.
60 * The new replacement for it is, but Linux doesn't yet support this.
61 * Alan Cox Linux 2.1.55
62 * 1.3: Set up a valid data descriptor 0x40 for buggy BIOS's
63 * 1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by
64 * Dean Gaudet <dgaudet@arctic.org>.
65 * C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87
66 * 1.5: Fix segment register reloading (in case of bad segments saved
67 * across BIOS call).
68 * Stephen Rothwell
69 * 1.6: Cope with complier/assembler differences.
70 * Only try to turn off the first display device.
71 * Fix OOPS at power off with no APM BIOS by Jan Echternach
72 * <echter@informatik.uni-rostock.de>
73 * Stephen Rothwell
74 * 1.7: Modify driver's cached copy of the disabled/disengaged flags
75 * to reflect current state of APM BIOS.
76 * Chris Rankin <rankinc@bellsouth.net>
77 * Reset interrupt 0 timer to 100Hz after suspend
78 * Chad Miller <cmiller@surfsouth.com>
79 * Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
80 * Richard Gooch <rgooch@atnf.csiro.au>
81 * Allow boot time disabling of APM
82 * Make boot messages far less verbose by default
83 * Make asm safer
84 * Stephen Rothwell
85 * 1.8: Add CONFIG_APM_RTC_IS_GMT
86 * Richard Gooch <rgooch@atnf.csiro.au>
87 * change APM_NOINTS to CONFIG_APM_ALLOW_INTS
88 * remove dependency on CONFIG_PROC_FS
89 * Stephen Rothwell
90 * 1.9: Fix small typo. <laslo@wodip.opole.pl>
91 * Try to cope with BIOS's that need to have all display
92 * devices blanked and not just the first one.
93 * Ross Paterson <ross@soi.city.ac.uk>
94 * Fix segment limit setting it has always been wrong as
95 * the segments needed to have byte granularity.
96 * Mark a few things __init.
97 * Add hack to allow power off of SMP systems by popular request.
98 * Use CONFIG_SMP instead of __SMP__
99 * Ignore BOUNCES for three seconds.
100 * Stephen Rothwell
101 * 1.10: Fix for Thinkpad return code.
102 * Merge 2.2 and 2.3 drivers.
103 * Remove APM dependencies in arch/i386/kernel/process.c
104 * Remove APM dependencies in drivers/char/sysrq.c
105 * Reset time across standby.
106 * Allow more inititialisation on SMP.
107 * Remove CONFIG_APM_POWER_OFF and make it boot time
108 * configurable (default on).
109 * Make debug only a boot time parameter (remove APM_DEBUG).
110 * Try to blank all devices on any error.
111 * 1.11: Remove APM dependencies in drivers/char/console.c
112 * Check nr_running to detect if we are idle (from
113 * Borislav Deianov <borislav@lix.polytechnique.fr>)
114 * Fix for bioses that don't zero the top part of the
115 * entrypoint offset (Mario Sitta <sitta@al.unipmn.it>)
116 * (reported by Panos Katsaloulis <teras@writeme.com>).
117 * Real mode power off patch (Walter Hofmann
118 * <Walter.Hofmann@physik.stud.uni-erlangen.de>).
119 * 1.12: Remove CONFIG_SMP as the compiler will optimize
120 * the code away anyway (smp_num_cpus == 1 in UP)
121 * noted by Artur Skawina <skawina@geocities.com>.
122 * Make power off under SMP work again.
123 * Fix thinko with initial engaging of BIOS.
124 * Make sure power off only happens on CPU 0
125 * (Paul "Rusty" Russell <rusty@rustcorp.com.au>).
126 * Do error notification to user mode if BIOS calls fail.
127 * Move entrypoint offset fix to ...boot/setup.S
128 * where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>).
129 * Remove smp-power-off. SMP users must now specify
130 * "apm=power-off" on the kernel command line. Suggested
131 * by Jim Avera <jima@hal.com>, modified by Alan Cox
132 * <alan@lxorguk.ukuu.org.uk>.
133 * Register the /proc/apm entry even on SMP so that
134 * scripts that check for it before doing power off
135 * work (Jim Avera <jima@hal.com>).
136 * 1.13: Changes for new pm_ interfaces (Andy Henroid
137 * <andy_henroid@yahoo.com>).
138 * Modularize the code.
139 * Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS
140 * is now the way life works).
141 * Fix thinko in suspend() (wrong return).
142 * Notify drivers on critical suspend.
143 * Make kapmd absorb more idle time (Pavel Machek <pavel@suse.cz>
144 * modified by sfr).
145 * Disable interrupts while we are suspended (Andy Henroid
146 * <andy_henroid@yahoo.com> fixed by sfr).
147 * Make power off work on SMP again (Tony Hoyle
148 * <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr.
149 * Remove CONFIG_APM_SUSPEND_BOUNCE. The bounce ignore
150 * interval is now configurable.
151 * 1.14: Make connection version persist across module unload/load.
152 * Enable and engage power management earlier.
153 * Disengage power management on module unload.
154 * Changed to use the sysrq-register hack for registering the
155 * power off function called by magic sysrq based upon discussions
156 * in irc://irc.openprojects.net/#kernelnewbies
157 * (Crutcher Dunnavant <crutcher+kernel@datastacks.com>).
158 * Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable.
159 * (Arjan van de Ven <arjanv@redhat.com>) modified by sfr.
160 * Work around byte swap bug in one of the Vaio's BIOS's
161 * (Marc Boucher <marc@mbsi.ca>).
162 * Exposed the disable flag to dmi so that we can handle known
163 * broken APM (Alan Cox <alan@redhat.com>).
164 * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
165 * calling it - instead idle. (Alan Cox <alan@redhat.com>)
166 * If an APM idle fails log it and idle sensibly
167 * 1.15: Don't queue events to clients who open the device O_WRONLY.
168 * Don't expect replies from clients who open the device O_RDONLY.
169 * (Idea from Thomas Hood)
170 * Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>)
171 * 1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.)
172 * Notify listeners of standby or suspend events before notifying
173 * drivers. Return EBUSY to ioctl() if suspend is rejected.
174 * (Russell King <rmk@arm.linux.org.uk> and Thomas Hood)
175 * Ignore first resume after we generate our own resume event
176 * after a suspend (Thomas Hood)
177 * Daemonize now gets rid of our controlling terminal (sfr).
178 * CONFIG_APM_CPU_IDLE now just affects the default value of
179 * idle_threshold (sfr).
180 * Change name of kernel apm daemon (as it no longer idles) (sfr).
181 * 1.16ac: Fix up SMP support somewhat. You can now force SMP on and we
182 * make _all_ APM calls on the CPU#0. Fix unsafe sign bug.
183 * TODO: determine if its "boot CPU" or "CPU0" we want to lock to.
184 *
185 * APM 1.1 Reference:
186 *
187 * Intel Corporation, Microsoft Corporation. Advanced Power Management
188 * (APM) BIOS Interface Specification, Revision 1.1, September 1993.
189 * Intel Order Number 241704-001. Microsoft Part Number 781-110-X01.
190 *
191 * [This document is available free from Intel by calling 800.628.8686 (fax
192 * 916.356.6100) or 800.548.4725; or via anonymous ftp from
193 * ftp://ftp.intel.com/pub/IAL/software_specs/apmv11.doc. It is also
194 * available from Microsoft by calling 206.882.8080.]
195 *
196 * APM 1.2 Reference:
197 * Intel Corporation, Microsoft Corporation. Advanced Power Management
198 * (APM) BIOS Interface Specification, Revision 1.2, February 1996.
199 *
200 * [This document is available from Microsoft at:
201 * http://www.microsoft.com/whdc/archive/amp_12.mspx]
202 */
203
204 #include <linux/module.h>
205
206 #include <linux/poll.h>
207 #include <linux/types.h>
208 #include <linux/stddef.h>
209 #include <linux/timer.h>
210 #include <linux/fcntl.h>
211 #include <linux/slab.h>
212 #include <linux/stat.h>
213 #include <linux/proc_fs.h>
214 #include <linux/seq_file.h>
215 #include <linux/miscdevice.h>
216 #include <linux/apm_bios.h>
217 #include <linux/init.h>
218 #include <linux/time.h>
219 #include <linux/sched.h>
220 #include <linux/pm.h>
221 #include <linux/pm_legacy.h>
222 #include <linux/capability.h>
223 #include <linux/device.h>
224 #include <linux/kernel.h>
225 #include <linux/freezer.h>
226 #include <linux/smp.h>
227 #include <linux/dmi.h>
228 #include <linux/suspend.h>
229 #include <linux/kthread.h>
230 #include <linux/jiffies.h>
231
232 #include <asm/system.h>
233 #include <asm/uaccess.h>
234 #include <asm/desc.h>
235 #include <asm/i8253.h>
236 #include <asm/paravirt.h>
237 #include <asm/reboot.h>
238
239 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
240 extern int (*console_blank_hook)(int);
241 #endif
242
243 /*
244 * The apm_bios device is one of the misc char devices.
245 * This is its minor number.
246 */
247 #define APM_MINOR_DEV 134
248
249 /*
250 * See Documentation/Config.help for the configuration options.
251 *
252 * Various options can be changed at boot time as follows:
253 * (We allow underscores for compatibility with the modules code)
254 * apm=on/off enable/disable APM
255 * [no-]allow[-_]ints allow interrupts during BIOS calls
256 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
257 * [no-]realmode[-_]power[-_]off switch to real mode before
258 * powering off
259 * [no-]debug log some debugging messages
260 * [no-]power[-_]off power off on shutdown
261 * [no-]smp Use apm even on an SMP box
262 * bounce[-_]interval=<n> number of ticks to ignore suspend
263 * bounces
264 * idle[-_]threshold=<n> System idle percentage above which to
265 * make APM BIOS idle calls. Set it to
266 * 100 to disable.
267 * idle[-_]period=<n> Period (in 1/100s of a second) over
268 * which the idle percentage is
269 * calculated.
270 */
271
272 /* KNOWN PROBLEM MACHINES:
273 *
274 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
275 * [Confirmed by TI representative]
276 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
277 * [Confirmed by BIOS disassembly]
278 * [This may work now ...]
279 * P: Toshiba 1950S: battery life information only gets updated after resume
280 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
281 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
282 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
283 * Neale Banks <neale@lowendale.com.au> December 2000
284 *
285 * Legend: U = unusable with APM patches
286 * P = partially usable with APM patches
287 */
288
289 /*
290 * Define as 1 to make the driver always call the APM BIOS busy
291 * routine even if the clock was not reported as slowed by the
292 * idle routine. Otherwise, define as 0.
293 */
294 #define ALWAYS_CALL_BUSY 1
295
296 /*
297 * Define to make the APM BIOS calls zero all data segment registers (so
298 * that an incorrect BIOS implementation will cause a kernel panic if it
299 * tries to write to arbitrary memory).
300 */
301 #define APM_ZERO_SEGS
302
303 #include "apm.h"
304
305 /*
306 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
307 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
308 * David Chen <chen@ctpa04.mit.edu>
309 */
310 #undef INIT_TIMER_AFTER_SUSPEND
311
312 #ifdef INIT_TIMER_AFTER_SUSPEND
313 #include <linux/timex.h>
314 #include <asm/io.h>
315 #include <linux/delay.h>
316 #endif
317
318 /*
319 * Need to poll the APM BIOS every second
320 */
321 #define APM_CHECK_TIMEOUT (HZ)
322
323 /*
324 * Ignore suspend events for this amount of time after a resume
325 */
326 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
327
328 /*
329 * Maximum number of events stored
330 */
331 #define APM_MAX_EVENTS 20
332
333 /*
334 * The per-file APM data
335 */
336 struct apm_user {
337 int magic;
338 struct apm_user *next;
339 unsigned int suser: 1;
340 unsigned int writer: 1;
341 unsigned int reader: 1;
342 unsigned int suspend_wait: 1;
343 int suspend_result;
344 int suspends_pending;
345 int standbys_pending;
346 int suspends_read;
347 int standbys_read;
348 int event_head;
349 int event_tail;
350 apm_event_t events[APM_MAX_EVENTS];
351 };
352
353 /*
354 * The magic number in apm_user
355 */
356 #define APM_BIOS_MAGIC 0x4101
357
358 /*
359 * idle percentage above which bios idle calls are done
360 */
361 #ifdef CONFIG_APM_CPU_IDLE
362 #define DEFAULT_IDLE_THRESHOLD 95
363 #else
364 #define DEFAULT_IDLE_THRESHOLD 100
365 #endif
366 #define DEFAULT_IDLE_PERIOD (100 / 3)
367
368 /*
369 * Local variables
370 */
371 static struct {
372 unsigned long offset;
373 unsigned short segment;
374 } apm_bios_entry;
375 static int clock_slowed;
376 static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
377 static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
378 static int set_pm_idle;
379 static int suspends_pending;
380 static int standbys_pending;
381 static int ignore_sys_suspend;
382 static int ignore_normal_resume;
383 static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
384
385 static int debug __read_mostly;
386 static int smp __read_mostly;
387 static int apm_disabled = -1;
388 #ifdef CONFIG_SMP
389 static int power_off;
390 #else
391 static int power_off = 1;
392 #endif
393 #ifdef CONFIG_APM_REAL_MODE_POWER_OFF
394 static int realmode_power_off = 1;
395 #else
396 static int realmode_power_off;
397 #endif
398 #ifdef CONFIG_APM_ALLOW_INTS
399 static int allow_ints = 1;
400 #else
401 static int allow_ints;
402 #endif
403 static int broken_psr;
404
405 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
406 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
407 static struct apm_user *user_list;
408 static DEFINE_SPINLOCK(user_list_lock);
409 static const struct desc_struct bad_bios_desc = { { { 0, 0x00409200 } } };
410
411 static const char driver_version[] = "1.16ac"; /* no spaces */
412
413 static struct task_struct *kapmd_task;
414
415 /*
416 * APM event names taken from the APM 1.2 specification. These are
417 * the message codes that the BIOS uses to tell us about events
418 */
419 static const char * const apm_event_name[] = {
420 "system standby",
421 "system suspend",
422 "normal resume",
423 "critical resume",
424 "low battery",
425 "power status change",
426 "update time",
427 "critical suspend",
428 "user standby",
429 "user suspend",
430 "system standby resume",
431 "capabilities change"
432 };
433 #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
434
435 typedef struct lookup_t {
436 int key;
437 char *msg;
438 } lookup_t;
439
440 /*
441 * The BIOS returns a set of standard error codes in AX when the
442 * carry flag is set.
443 */
444
445 static const lookup_t error_table[] = {
446 /* N/A { APM_SUCCESS, "Operation succeeded" }, */
447 { APM_DISABLED, "Power management disabled" },
448 { APM_CONNECTED, "Real mode interface already connected" },
449 { APM_NOT_CONNECTED, "Interface not connected" },
450 { APM_16_CONNECTED, "16 bit interface already connected" },
451 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
452 { APM_32_CONNECTED, "32 bit interface already connected" },
453 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
454 { APM_BAD_DEVICE, "Unrecognized device ID" },
455 { APM_BAD_PARAM, "Parameter out of range" },
456 { APM_NOT_ENGAGED, "Interface not engaged" },
457 { APM_BAD_FUNCTION, "Function not supported" },
458 { APM_RESUME_DISABLED, "Resume timer disabled" },
459 { APM_BAD_STATE, "Unable to enter requested state" },
460 /* N/A { APM_NO_EVENTS, "No events pending" }, */
461 { APM_NO_ERROR, "BIOS did not set a return code" },
462 { APM_NOT_PRESENT, "No APM present" }
463 };
464 #define ERROR_COUNT ARRAY_SIZE(error_table)
465
466 /**
467 * apm_error - display an APM error
468 * @str: information string
469 * @err: APM BIOS return code
470 *
471 * Write a meaningful log entry to the kernel log in the event of
472 * an APM error.
473 */
474
475 static void apm_error(char *str, int err)
476 {
477 int i;
478
479 for (i = 0; i < ERROR_COUNT; i++)
480 if (error_table[i].key == err)
481 break;
482 if (i < ERROR_COUNT)
483 printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
484 else
485 printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
486 str, err);
487 }
488
489 /*
490 * Lock APM functionality to physical CPU 0
491 */
492
493 #ifdef CONFIG_SMP
494
495 static cpumask_t apm_save_cpus(void)
496 {
497 cpumask_t x = current->cpus_allowed;
498 /* Some bioses don't like being called from CPU != 0 */
499 set_cpus_allowed(current, cpumask_of_cpu(0));
500 BUG_ON(smp_processor_id() != 0);
501 return x;
502 }
503
504 static inline void apm_restore_cpus(cpumask_t mask)
505 {
506 set_cpus_allowed(current, mask);
507 }
508
509 #else
510
511 /*
512 * No CPU lockdown needed on a uniprocessor
513 */
514
515 #define apm_save_cpus() (current->cpus_allowed)
516 #define apm_restore_cpus(x) (void)(x)
517
518 #endif
519
520 /*
521 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
522 * apm_info.allow_ints, we are being really paranoid here! Not only
523 * are interrupts disabled, but all the segment registers (except SS)
524 * are saved and zeroed this means that if the BIOS tries to reference
525 * any data without explicitly loading the segment registers, the kernel
526 * will fault immediately rather than have some unforeseen circumstances
527 * for the rest of the kernel. And it will be very obvious! :-) Doing
528 * this depends on CS referring to the same physical memory as DS so that
529 * DS can be zeroed before the call. Unfortunately, we can't do anything
530 * about the stack segment/pointer. Also, we tell the compiler that
531 * everything could change.
532 *
533 * Also, we KNOW that for the non error case of apm_bios_call, there
534 * is no useful data returned in the low order 8 bits of eax.
535 */
536
537 static inline unsigned long __apm_irq_save(void)
538 {
539 unsigned long flags;
540 local_save_flags(flags);
541 if (apm_info.allow_ints) {
542 if (irqs_disabled_flags(flags))
543 local_irq_enable();
544 } else
545 local_irq_disable();
546
547 return flags;
548 }
549
550 #define apm_irq_save(flags) \
551 do { flags = __apm_irq_save(); } while (0)
552
553 static inline void apm_irq_restore(unsigned long flags)
554 {
555 if (irqs_disabled_flags(flags))
556 local_irq_disable();
557 else if (irqs_disabled())
558 local_irq_enable();
559 }
560
561 #ifdef APM_ZERO_SEGS
562 # define APM_DECL_SEGS \
563 unsigned int saved_fs; unsigned int saved_gs;
564 # define APM_DO_SAVE_SEGS \
565 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
566 # define APM_DO_RESTORE_SEGS \
567 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
568 #else
569 # define APM_DECL_SEGS
570 # define APM_DO_SAVE_SEGS
571 # define APM_DO_RESTORE_SEGS
572 #endif
573
574 /**
575 * apm_bios_call - Make an APM BIOS 32bit call
576 * @func: APM function to execute
577 * @ebx_in: EBX register for call entry
578 * @ecx_in: ECX register for call entry
579 * @eax: EAX register return
580 * @ebx: EBX register return
581 * @ecx: ECX register return
582 * @edx: EDX register return
583 * @esi: ESI register return
584 *
585 * Make an APM call using the 32bit protected mode interface. The
586 * caller is responsible for knowing if APM BIOS is configured and
587 * enabled. This call can disable interrupts for a long period of
588 * time on some laptops. The return value is in AH and the carry
589 * flag is loaded into AL. If there is an error, then the error
590 * code is returned in AH (bits 8-15 of eax) and this function
591 * returns non-zero.
592 */
593
594 static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in,
595 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi)
596 {
597 APM_DECL_SEGS
598 unsigned long flags;
599 cpumask_t cpus;
600 int cpu;
601 struct desc_struct save_desc_40;
602 struct desc_struct *gdt;
603
604 cpus = apm_save_cpus();
605
606 cpu = get_cpu();
607 gdt = get_cpu_gdt_table(cpu);
608 save_desc_40 = gdt[0x40 / 8];
609 gdt[0x40 / 8] = bad_bios_desc;
610
611 apm_irq_save(flags);
612 APM_DO_SAVE_SEGS;
613 apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi);
614 APM_DO_RESTORE_SEGS;
615 apm_irq_restore(flags);
616 gdt[0x40 / 8] = save_desc_40;
617 put_cpu();
618 apm_restore_cpus(cpus);
619
620 return *eax & 0xff;
621 }
622
623 /**
624 * apm_bios_call_simple - make a simple APM BIOS 32bit call
625 * @func: APM function to invoke
626 * @ebx_in: EBX register value for BIOS call
627 * @ecx_in: ECX register value for BIOS call
628 * @eax: EAX register on return from the BIOS call
629 *
630 * Make a BIOS call that returns one value only, or just status.
631 * If there is an error, then the error code is returned in AH
632 * (bits 8-15 of eax) and this function returns non-zero. This is
633 * used for simpler BIOS operations. This call may hold interrupts
634 * off for a long time on some laptops.
635 */
636
637 static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax)
638 {
639 u8 error;
640 APM_DECL_SEGS
641 unsigned long flags;
642 cpumask_t cpus;
643 int cpu;
644 struct desc_struct save_desc_40;
645 struct desc_struct *gdt;
646
647 cpus = apm_save_cpus();
648
649 cpu = get_cpu();
650 gdt = get_cpu_gdt_table(cpu);
651 save_desc_40 = gdt[0x40 / 8];
652 gdt[0x40 / 8] = bad_bios_desc;
653
654 apm_irq_save(flags);
655 APM_DO_SAVE_SEGS;
656 error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax);
657 APM_DO_RESTORE_SEGS;
658 apm_irq_restore(flags);
659 gdt[0x40 / 8] = save_desc_40;
660 put_cpu();
661 apm_restore_cpus(cpus);
662 return error;
663 }
664
665 /**
666 * apm_driver_version - APM driver version
667 * @val: loaded with the APM version on return
668 *
669 * Retrieve the APM version supported by the BIOS. This is only
670 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
671 * probably present.
672 *
673 * On entry val should point to a value indicating the APM driver
674 * version with the high byte being the major and the low byte the
675 * minor number both in BCD
676 *
677 * On return it will hold the BIOS revision supported in the
678 * same format.
679 */
680
681 static int apm_driver_version(u_short *val)
682 {
683 u32 eax;
684
685 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax))
686 return (eax >> 8) & 0xff;
687 *val = eax;
688 return APM_SUCCESS;
689 }
690
691 /**
692 * apm_get_event - get an APM event from the BIOS
693 * @event: pointer to the event
694 * @info: point to the event information
695 *
696 * The APM BIOS provides a polled information for event
697 * reporting. The BIOS expects to be polled at least every second
698 * when events are pending. When a message is found the caller should
699 * poll until no more messages are present. However, this causes
700 * problems on some laptops where a suspend event notification is
701 * not cleared until it is acknowledged.
702 *
703 * Additional information is returned in the info pointer, providing
704 * that APM 1.2 is in use. If no messges are pending the value 0x80
705 * is returned (No power management events pending).
706 */
707
708 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
709 {
710 u32 eax;
711 u32 ebx;
712 u32 ecx;
713 u32 dummy;
714
715 if (apm_bios_call(APM_FUNC_GET_EVENT, 0, 0, &eax, &ebx, &ecx,
716 &dummy, &dummy))
717 return (eax >> 8) & 0xff;
718 *event = ebx;
719 if (apm_info.connection_version < 0x0102)
720 *info = ~0; /* indicate info not valid */
721 else
722 *info = ecx;
723 return APM_SUCCESS;
724 }
725
726 /**
727 * set_power_state - set the power management state
728 * @what: which items to transition
729 * @state: state to transition to
730 *
731 * Request an APM change of state for one or more system devices. The
732 * processor state must be transitioned last of all. what holds the
733 * class of device in the upper byte and the device number (0xFF for
734 * all) for the object to be transitioned.
735 *
736 * The state holds the state to transition to, which may in fact
737 * be an acceptance of a BIOS requested state change.
738 */
739
740 static int set_power_state(u_short what, u_short state)
741 {
742 u32 eax;
743
744 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax))
745 return (eax >> 8) & 0xff;
746 return APM_SUCCESS;
747 }
748
749 /**
750 * set_system_power_state - set system wide power state
751 * @state: which state to enter
752 *
753 * Transition the entire system into a new APM power state.
754 */
755
756 static int set_system_power_state(u_short state)
757 {
758 return set_power_state(APM_DEVICE_ALL, state);
759 }
760
761 /**
762 * apm_do_idle - perform power saving
763 *
764 * This function notifies the BIOS that the processor is (in the view
765 * of the OS) idle. It returns -1 in the event that the BIOS refuses
766 * to handle the idle request. On a success the function returns 1
767 * if the BIOS did clock slowing or 0 otherwise.
768 */
769
770 static int apm_do_idle(void)
771 {
772 u32 eax;
773 u8 ret = 0;
774 int idled = 0;
775 int polling;
776
777 polling = !!(current_thread_info()->status & TS_POLLING);
778 if (polling) {
779 current_thread_info()->status &= ~TS_POLLING;
780 /*
781 * TS_POLLING-cleared state must be visible before we
782 * test NEED_RESCHED:
783 */
784 smp_mb();
785 }
786 if (!need_resched()) {
787 idled = 1;
788 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax);
789 }
790 if (polling)
791 current_thread_info()->status |= TS_POLLING;
792
793 if (!idled)
794 return 0;
795
796 if (ret) {
797 static unsigned long t;
798
799 /* This always fails on some SMP boards running UP kernels.
800 * Only report the failure the first 5 times.
801 */
802 if (++t < 5) {
803 printk(KERN_DEBUG "apm_do_idle failed (%d)\n",
804 (eax >> 8) & 0xff);
805 t = jiffies;
806 }
807 return -1;
808 }
809 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
810 return clock_slowed;
811 }
812
813 /**
814 * apm_do_busy - inform the BIOS the CPU is busy
815 *
816 * Request that the BIOS brings the CPU back to full performance.
817 */
818
819 static void apm_do_busy(void)
820 {
821 u32 dummy;
822
823 if (clock_slowed || ALWAYS_CALL_BUSY) {
824 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy);
825 clock_slowed = 0;
826 }
827 }
828
829 /*
830 * If no process has really been interested in
831 * the CPU for some time, we want to call BIOS
832 * power management - we probably want
833 * to conserve power.
834 */
835 #define IDLE_CALC_LIMIT (HZ * 100)
836 #define IDLE_LEAKY_MAX 16
837
838 static void (*original_pm_idle)(void) __read_mostly;
839
840 /**
841 * apm_cpu_idle - cpu idling for APM capable Linux
842 *
843 * This is the idling function the kernel executes when APM is available. It
844 * tries to do BIOS powermanagement based on the average system idle time.
845 * Furthermore it calls the system default idle routine.
846 */
847
848 static void apm_cpu_idle(void)
849 {
850 static int use_apm_idle; /* = 0 */
851 static unsigned int last_jiffies; /* = 0 */
852 static unsigned int last_stime; /* = 0 */
853
854 int apm_idle_done = 0;
855 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
856 unsigned int bucket;
857
858 recalc:
859 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
860 use_apm_idle = 0;
861 last_jiffies = jiffies;
862 last_stime = current->stime;
863 } else if (jiffies_since_last_check > idle_period) {
864 unsigned int idle_percentage;
865
866 idle_percentage = current->stime - last_stime;
867 idle_percentage *= 100;
868 idle_percentage /= jiffies_since_last_check;
869 use_apm_idle = (idle_percentage > idle_threshold);
870 if (apm_info.forbid_idle)
871 use_apm_idle = 0;
872 last_jiffies = jiffies;
873 last_stime = current->stime;
874 }
875
876 bucket = IDLE_LEAKY_MAX;
877
878 while (!need_resched()) {
879 if (use_apm_idle) {
880 unsigned int t;
881
882 t = jiffies;
883 switch (apm_do_idle()) {
884 case 0:
885 apm_idle_done = 1;
886 if (t != jiffies) {
887 if (bucket) {
888 bucket = IDLE_LEAKY_MAX;
889 continue;
890 }
891 } else if (bucket) {
892 bucket--;
893 continue;
894 }
895 break;
896 case 1:
897 apm_idle_done = 1;
898 break;
899 default: /* BIOS refused */
900 break;
901 }
902 }
903 if (original_pm_idle)
904 original_pm_idle();
905 else
906 default_idle();
907 jiffies_since_last_check = jiffies - last_jiffies;
908 if (jiffies_since_last_check > idle_period)
909 goto recalc;
910 }
911
912 if (apm_idle_done)
913 apm_do_busy();
914 }
915
916 /**
917 * apm_power_off - ask the BIOS to power off
918 *
919 * Handle the power off sequence. This is the one piece of code we
920 * will execute even on SMP machines. In order to deal with BIOS
921 * bugs we support real mode APM BIOS power off calls. We also make
922 * the SMP call on CPU0 as some systems will only honour this call
923 * on their first cpu.
924 */
925
926 static void apm_power_off(void)
927 {
928 unsigned char po_bios_call[] = {
929 0xb8, 0x00, 0x10, /* movw $0x1000,ax */
930 0x8e, 0xd0, /* movw ax,ss */
931 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
932 0xb8, 0x07, 0x53, /* movw $0x5307,ax */
933 0xbb, 0x01, 0x00, /* movw $0x0001,bx */
934 0xb9, 0x03, 0x00, /* movw $0x0003,cx */
935 0xcd, 0x15 /* int $0x15 */
936 };
937
938 /* Some bioses don't like being called from CPU != 0 */
939 if (apm_info.realmode_power_off) {
940 (void)apm_save_cpus();
941 machine_real_restart(po_bios_call, sizeof(po_bios_call));
942 } else {
943 (void)set_system_power_state(APM_STATE_OFF);
944 }
945 }
946
947 #ifdef CONFIG_APM_DO_ENABLE
948
949 /**
950 * apm_enable_power_management - enable BIOS APM power management
951 * @enable: enable yes/no
952 *
953 * Enable or disable the APM BIOS power services.
954 */
955
956 static int apm_enable_power_management(int enable)
957 {
958 u32 eax;
959
960 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
961 return APM_NOT_ENGAGED;
962 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
963 enable, &eax))
964 return (eax >> 8) & 0xff;
965 if (enable)
966 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
967 else
968 apm_info.bios.flags |= APM_BIOS_DISABLED;
969 return APM_SUCCESS;
970 }
971 #endif
972
973 /**
974 * apm_get_power_status - get current power state
975 * @status: returned status
976 * @bat: battery info
977 * @life: estimated life
978 *
979 * Obtain the current power status from the APM BIOS. We return a
980 * status which gives the rough battery status, and current power
981 * source. The bat value returned give an estimate as a percentage
982 * of life and a status value for the battery. The estimated life
983 * if reported is a lifetime in secodnds/minutes at current powwer
984 * consumption.
985 */
986
987 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
988 {
989 u32 eax;
990 u32 ebx;
991 u32 ecx;
992 u32 edx;
993 u32 dummy;
994
995 if (apm_info.get_power_status_broken)
996 return APM_32_UNSUPPORTED;
997 if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0,
998 &eax, &ebx, &ecx, &edx, &dummy))
999 return (eax >> 8) & 0xff;
1000 *status = ebx;
1001 *bat = ecx;
1002 if (apm_info.get_power_status_swabinminutes) {
1003 *life = swab16((u16)edx);
1004 *life |= 0x8000;
1005 } else
1006 *life = edx;
1007 return APM_SUCCESS;
1008 }
1009
1010 #if 0
1011 static int apm_get_battery_status(u_short which, u_short *status,
1012 u_short *bat, u_short *life, u_short *nbat)
1013 {
1014 u32 eax;
1015 u32 ebx;
1016 u32 ecx;
1017 u32 edx;
1018 u32 esi;
1019
1020 if (apm_info.connection_version < 0x0102) {
1021 /* pretend we only have one battery. */
1022 if (which != 1)
1023 return APM_BAD_DEVICE;
1024 *nbat = 1;
1025 return apm_get_power_status(status, bat, life);
1026 }
1027
1028 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1029 &ebx, &ecx, &edx, &esi))
1030 return (eax >> 8) & 0xff;
1031 *status = ebx;
1032 *bat = ecx;
1033 *life = edx;
1034 *nbat = esi;
1035 return APM_SUCCESS;
1036 }
1037 #endif
1038
1039 /**
1040 * apm_engage_power_management - enable PM on a device
1041 * @device: identity of device
1042 * @enable: on/off
1043 *
1044 * Activate or deactive power management on either a specific device
1045 * or the entire system (%APM_DEVICE_ALL).
1046 */
1047
1048 static int apm_engage_power_management(u_short device, int enable)
1049 {
1050 u32 eax;
1051
1052 if ((enable == 0) && (device == APM_DEVICE_ALL)
1053 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1054 return APM_DISABLED;
1055 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax))
1056 return (eax >> 8) & 0xff;
1057 if (device == APM_DEVICE_ALL) {
1058 if (enable)
1059 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1060 else
1061 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1062 }
1063 return APM_SUCCESS;
1064 }
1065
1066 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1067
1068 /**
1069 * apm_console_blank - blank the display
1070 * @blank: on/off
1071 *
1072 * Attempt to blank the console, firstly by blanking just video device
1073 * zero, and if that fails (some BIOSes don't support it) then it blanks
1074 * all video devices. Typically the BIOS will do laptop backlight and
1075 * monitor powerdown for us.
1076 */
1077
1078 static int apm_console_blank(int blank)
1079 {
1080 int error = APM_NOT_ENGAGED; /* silence gcc */
1081 int i;
1082 u_short state;
1083 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1084
1085 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1086
1087 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1088 error = set_power_state(dev[i], state);
1089
1090 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1091 return 1;
1092
1093 if (error == APM_NOT_ENGAGED)
1094 break;
1095 }
1096
1097 if (error == APM_NOT_ENGAGED) {
1098 static int tried;
1099 int eng_error;
1100 if (tried++ == 0) {
1101 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1102 if (eng_error) {
1103 apm_error("set display", error);
1104 apm_error("engage interface", eng_error);
1105 return 0;
1106 } else
1107 return apm_console_blank(blank);
1108 }
1109 }
1110 apm_error("set display", error);
1111 return 0;
1112 }
1113 #endif
1114
1115 static int queue_empty(struct apm_user *as)
1116 {
1117 return as->event_head == as->event_tail;
1118 }
1119
1120 static apm_event_t get_queued_event(struct apm_user *as)
1121 {
1122 if (++as->event_tail >= APM_MAX_EVENTS)
1123 as->event_tail = 0;
1124 return as->events[as->event_tail];
1125 }
1126
1127 static void queue_event(apm_event_t event, struct apm_user *sender)
1128 {
1129 struct apm_user *as;
1130
1131 spin_lock(&user_list_lock);
1132 if (user_list == NULL)
1133 goto out;
1134 for (as = user_list; as != NULL; as = as->next) {
1135 if ((as == sender) || (!as->reader))
1136 continue;
1137 if (++as->event_head >= APM_MAX_EVENTS)
1138 as->event_head = 0;
1139
1140 if (as->event_head == as->event_tail) {
1141 static int notified;
1142
1143 if (notified++ == 0)
1144 printk(KERN_ERR "apm: an event queue overflowed\n");
1145 if (++as->event_tail >= APM_MAX_EVENTS)
1146 as->event_tail = 0;
1147 }
1148 as->events[as->event_head] = event;
1149 if ((!as->suser) || (!as->writer))
1150 continue;
1151 switch (event) {
1152 case APM_SYS_SUSPEND:
1153 case APM_USER_SUSPEND:
1154 as->suspends_pending++;
1155 suspends_pending++;
1156 break;
1157
1158 case APM_SYS_STANDBY:
1159 case APM_USER_STANDBY:
1160 as->standbys_pending++;
1161 standbys_pending++;
1162 break;
1163 }
1164 }
1165 wake_up_interruptible(&apm_waitqueue);
1166 out:
1167 spin_unlock(&user_list_lock);
1168 }
1169
1170 static void reinit_timer(void)
1171 {
1172 #ifdef INIT_TIMER_AFTER_SUSPEND
1173 unsigned long flags;
1174
1175 spin_lock_irqsave(&i8253_lock, flags);
1176 /* set the clock to HZ */
1177 outb_pit(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1178 udelay(10);
1179 outb_pit(LATCH & 0xff, PIT_CH0); /* LSB */
1180 udelay(10);
1181 outb_pit(LATCH >> 8, PIT_CH0); /* MSB */
1182 udelay(10);
1183 spin_unlock_irqrestore(&i8253_lock, flags);
1184 #endif
1185 }
1186
1187 static int suspend(int vetoable)
1188 {
1189 int err;
1190 struct apm_user *as;
1191
1192 if (pm_send_all(PM_SUSPEND, (void *)3)) {
1193 /* Vetoed */
1194 if (vetoable) {
1195 if (apm_info.connection_version > 0x100)
1196 set_system_power_state(APM_STATE_REJECT);
1197 err = -EBUSY;
1198 ignore_sys_suspend = 0;
1199 printk(KERN_WARNING "apm: suspend was vetoed.\n");
1200 goto out;
1201 }
1202 printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
1203 }
1204
1205 device_suspend(PMSG_SUSPEND);
1206 local_irq_disable();
1207 device_power_down(PMSG_SUSPEND);
1208
1209 local_irq_enable();
1210
1211 save_processor_state();
1212 err = set_system_power_state(APM_STATE_SUSPEND);
1213 ignore_normal_resume = 1;
1214 restore_processor_state();
1215
1216 local_irq_disable();
1217 reinit_timer();
1218
1219 if (err == APM_NO_ERROR)
1220 err = APM_SUCCESS;
1221 if (err != APM_SUCCESS)
1222 apm_error("suspend", err);
1223 err = (err == APM_SUCCESS) ? 0 : -EIO;
1224 device_power_up();
1225 local_irq_enable();
1226 device_resume();
1227 pm_send_all(PM_RESUME, (void *)0);
1228 queue_event(APM_NORMAL_RESUME, NULL);
1229 out:
1230 spin_lock(&user_list_lock);
1231 for (as = user_list; as != NULL; as = as->next) {
1232 as->suspend_wait = 0;
1233 as->suspend_result = err;
1234 }
1235 spin_unlock(&user_list_lock);
1236 wake_up_interruptible(&apm_suspend_waitqueue);
1237 return err;
1238 }
1239
1240 static void standby(void)
1241 {
1242 int err;
1243
1244 local_irq_disable();
1245 device_power_down(PMSG_SUSPEND);
1246 local_irq_enable();
1247
1248 err = set_system_power_state(APM_STATE_STANDBY);
1249 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1250 apm_error("standby", err);
1251
1252 local_irq_disable();
1253 device_power_up();
1254 local_irq_enable();
1255 }
1256
1257 static apm_event_t get_event(void)
1258 {
1259 int error;
1260 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1261 apm_eventinfo_t info;
1262
1263 static int notified;
1264
1265 /* we don't use the eventinfo */
1266 error = apm_get_event(&event, &info);
1267 if (error == APM_SUCCESS)
1268 return event;
1269
1270 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1271 apm_error("get_event", error);
1272
1273 return 0;
1274 }
1275
1276 static void check_events(void)
1277 {
1278 apm_event_t event;
1279 static unsigned long last_resume;
1280 static int ignore_bounce;
1281
1282 while ((event = get_event()) != 0) {
1283 if (debug) {
1284 if (event <= NR_APM_EVENT_NAME)
1285 printk(KERN_DEBUG "apm: received %s notify\n",
1286 apm_event_name[event - 1]);
1287 else
1288 printk(KERN_DEBUG "apm: received unknown "
1289 "event 0x%02x\n", event);
1290 }
1291 if (ignore_bounce
1292 && (time_after(jiffies, last_resume + bounce_interval)))
1293 ignore_bounce = 0;
1294
1295 switch (event) {
1296 case APM_SYS_STANDBY:
1297 case APM_USER_STANDBY:
1298 queue_event(event, NULL);
1299 if (standbys_pending <= 0)
1300 standby();
1301 break;
1302
1303 case APM_USER_SUSPEND:
1304 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1305 if (apm_info.connection_version > 0x100)
1306 set_system_power_state(APM_STATE_REJECT);
1307 break;
1308 #endif
1309 case APM_SYS_SUSPEND:
1310 if (ignore_bounce) {
1311 if (apm_info.connection_version > 0x100)
1312 set_system_power_state(APM_STATE_REJECT);
1313 break;
1314 }
1315 /*
1316 * If we are already processing a SUSPEND,
1317 * then further SUSPEND events from the BIOS
1318 * will be ignored. We also return here to
1319 * cope with the fact that the Thinkpads keep
1320 * sending a SUSPEND event until something else
1321 * happens!
1322 */
1323 if (ignore_sys_suspend)
1324 return;
1325 ignore_sys_suspend = 1;
1326 queue_event(event, NULL);
1327 if (suspends_pending <= 0)
1328 (void) suspend(1);
1329 break;
1330
1331 case APM_NORMAL_RESUME:
1332 case APM_CRITICAL_RESUME:
1333 case APM_STANDBY_RESUME:
1334 ignore_sys_suspend = 0;
1335 last_resume = jiffies;
1336 ignore_bounce = 1;
1337 if ((event != APM_NORMAL_RESUME)
1338 || (ignore_normal_resume == 0)) {
1339 device_resume();
1340 pm_send_all(PM_RESUME, (void *)0);
1341 queue_event(event, NULL);
1342 }
1343 ignore_normal_resume = 0;
1344 break;
1345
1346 case APM_CAPABILITY_CHANGE:
1347 case APM_LOW_BATTERY:
1348 case APM_POWER_STATUS_CHANGE:
1349 queue_event(event, NULL);
1350 /* If needed, notify drivers here */
1351 break;
1352
1353 case APM_UPDATE_TIME:
1354 break;
1355
1356 case APM_CRITICAL_SUSPEND:
1357 /*
1358 * We are not allowed to reject a critical suspend.
1359 */
1360 (void)suspend(0);
1361 break;
1362 }
1363 }
1364 }
1365
1366 static void apm_event_handler(void)
1367 {
1368 static int pending_count = 4;
1369 int err;
1370
1371 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1372 if ((apm_info.connection_version > 0x100) &&
1373 (pending_count-- <= 0)) {
1374 pending_count = 4;
1375 if (debug)
1376 printk(KERN_DEBUG "apm: setting state busy\n");
1377 err = set_system_power_state(APM_STATE_BUSY);
1378 if (err)
1379 apm_error("busy", err);
1380 }
1381 } else
1382 pending_count = 4;
1383 check_events();
1384 }
1385
1386 /*
1387 * This is the APM thread main loop.
1388 */
1389
1390 static void apm_mainloop(void)
1391 {
1392 DECLARE_WAITQUEUE(wait, current);
1393
1394 add_wait_queue(&apm_waitqueue, &wait);
1395 set_current_state(TASK_INTERRUPTIBLE);
1396 for (;;) {
1397 schedule_timeout(APM_CHECK_TIMEOUT);
1398 if (kthread_should_stop())
1399 break;
1400 /*
1401 * Ok, check all events, check for idle (and mark us sleeping
1402 * so as not to count towards the load average)..
1403 */
1404 set_current_state(TASK_INTERRUPTIBLE);
1405 apm_event_handler();
1406 }
1407 remove_wait_queue(&apm_waitqueue, &wait);
1408 }
1409
1410 static int check_apm_user(struct apm_user *as, const char *func)
1411 {
1412 if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) {
1413 printk(KERN_ERR "apm: %s passed bad filp\n", func);
1414 return 1;
1415 }
1416 return 0;
1417 }
1418
1419 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1420 {
1421 struct apm_user *as;
1422 int i;
1423 apm_event_t event;
1424
1425 as = fp->private_data;
1426 if (check_apm_user(as, "read"))
1427 return -EIO;
1428 if ((int)count < sizeof(apm_event_t))
1429 return -EINVAL;
1430 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1431 return -EAGAIN;
1432 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1433 i = count;
1434 while ((i >= sizeof(event)) && !queue_empty(as)) {
1435 event = get_queued_event(as);
1436 if (copy_to_user(buf, &event, sizeof(event))) {
1437 if (i < count)
1438 break;
1439 return -EFAULT;
1440 }
1441 switch (event) {
1442 case APM_SYS_SUSPEND:
1443 case APM_USER_SUSPEND:
1444 as->suspends_read++;
1445 break;
1446
1447 case APM_SYS_STANDBY:
1448 case APM_USER_STANDBY:
1449 as->standbys_read++;
1450 break;
1451 }
1452 buf += sizeof(event);
1453 i -= sizeof(event);
1454 }
1455 if (i < count)
1456 return count - i;
1457 if (signal_pending(current))
1458 return -ERESTARTSYS;
1459 return 0;
1460 }
1461
1462 static unsigned int do_poll(struct file *fp, poll_table *wait)
1463 {
1464 struct apm_user *as;
1465
1466 as = fp->private_data;
1467 if (check_apm_user(as, "poll"))
1468 return 0;
1469 poll_wait(fp, &apm_waitqueue, wait);
1470 if (!queue_empty(as))
1471 return POLLIN | POLLRDNORM;
1472 return 0;
1473 }
1474
1475 static int do_ioctl(struct inode *inode, struct file *filp,
1476 u_int cmd, u_long arg)
1477 {
1478 struct apm_user *as;
1479
1480 as = filp->private_data;
1481 if (check_apm_user(as, "ioctl"))
1482 return -EIO;
1483 if ((!as->suser) || (!as->writer))
1484 return -EPERM;
1485 switch (cmd) {
1486 case APM_IOC_STANDBY:
1487 if (as->standbys_read > 0) {
1488 as->standbys_read--;
1489 as->standbys_pending--;
1490 standbys_pending--;
1491 } else
1492 queue_event(APM_USER_STANDBY, as);
1493 if (standbys_pending <= 0)
1494 standby();
1495 break;
1496 case APM_IOC_SUSPEND:
1497 if (as->suspends_read > 0) {
1498 as->suspends_read--;
1499 as->suspends_pending--;
1500 suspends_pending--;
1501 } else
1502 queue_event(APM_USER_SUSPEND, as);
1503 if (suspends_pending <= 0) {
1504 return suspend(1);
1505 } else {
1506 as->suspend_wait = 1;
1507 wait_event_interruptible(apm_suspend_waitqueue,
1508 as->suspend_wait == 0);
1509 return as->suspend_result;
1510 }
1511 break;
1512 default:
1513 return -EINVAL;
1514 }
1515 return 0;
1516 }
1517
1518 static int do_release(struct inode *inode, struct file *filp)
1519 {
1520 struct apm_user *as;
1521
1522 as = filp->private_data;
1523 if (check_apm_user(as, "release"))
1524 return 0;
1525 filp->private_data = NULL;
1526 if (as->standbys_pending > 0) {
1527 standbys_pending -= as->standbys_pending;
1528 if (standbys_pending <= 0)
1529 standby();
1530 }
1531 if (as->suspends_pending > 0) {
1532 suspends_pending -= as->suspends_pending;
1533 if (suspends_pending <= 0)
1534 (void) suspend(1);
1535 }
1536 spin_lock(&user_list_lock);
1537 if (user_list == as)
1538 user_list = as->next;
1539 else {
1540 struct apm_user *as1;
1541
1542 for (as1 = user_list;
1543 (as1 != NULL) && (as1->next != as);
1544 as1 = as1->next)
1545 ;
1546 if (as1 == NULL)
1547 printk(KERN_ERR "apm: filp not in user list\n");
1548 else
1549 as1->next = as->next;
1550 }
1551 spin_unlock(&user_list_lock);
1552 kfree(as);
1553 return 0;
1554 }
1555
1556 static int do_open(struct inode *inode, struct file *filp)
1557 {
1558 struct apm_user *as;
1559
1560 as = kmalloc(sizeof(*as), GFP_KERNEL);
1561 if (as == NULL) {
1562 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1563 sizeof(*as));
1564 return -ENOMEM;
1565 }
1566 as->magic = APM_BIOS_MAGIC;
1567 as->event_tail = as->event_head = 0;
1568 as->suspends_pending = as->standbys_pending = 0;
1569 as->suspends_read = as->standbys_read = 0;
1570 /*
1571 * XXX - this is a tiny bit broken, when we consider BSD
1572 * process accounting. If the device is opened by root, we
1573 * instantly flag that we used superuser privs. Who knows,
1574 * we might close the device immediately without doing a
1575 * privileged operation -- cevans
1576 */
1577 as->suser = capable(CAP_SYS_ADMIN);
1578 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1579 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1580 spin_lock(&user_list_lock);
1581 as->next = user_list;
1582 user_list = as;
1583 spin_unlock(&user_list_lock);
1584 filp->private_data = as;
1585 return 0;
1586 }
1587
1588 static int proc_apm_show(struct seq_file *m, void *v)
1589 {
1590 unsigned short bx;
1591 unsigned short cx;
1592 unsigned short dx;
1593 int error;
1594 unsigned short ac_line_status = 0xff;
1595 unsigned short battery_status = 0xff;
1596 unsigned short battery_flag = 0xff;
1597 int percentage = -1;
1598 int time_units = -1;
1599 char *units = "?";
1600
1601 if ((num_online_cpus() == 1) &&
1602 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1603 ac_line_status = (bx >> 8) & 0xff;
1604 battery_status = bx & 0xff;
1605 if ((cx & 0xff) != 0xff)
1606 percentage = cx & 0xff;
1607
1608 if (apm_info.connection_version > 0x100) {
1609 battery_flag = (cx >> 8) & 0xff;
1610 if (dx != 0xffff) {
1611 units = (dx & 0x8000) ? "min" : "sec";
1612 time_units = dx & 0x7fff;
1613 }
1614 }
1615 }
1616 /* Arguments, with symbols from linux/apm_bios.h. Information is
1617 from the Get Power Status (0x0a) call unless otherwise noted.
1618
1619 0) Linux driver version (this will change if format changes)
1620 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1621 2) APM flags from APM Installation Check (0x00):
1622 bit 0: APM_16_BIT_SUPPORT
1623 bit 1: APM_32_BIT_SUPPORT
1624 bit 2: APM_IDLE_SLOWS_CLOCK
1625 bit 3: APM_BIOS_DISABLED
1626 bit 4: APM_BIOS_DISENGAGED
1627 3) AC line status
1628 0x00: Off-line
1629 0x01: On-line
1630 0x02: On backup power (BIOS >= 1.1 only)
1631 0xff: Unknown
1632 4) Battery status
1633 0x00: High
1634 0x01: Low
1635 0x02: Critical
1636 0x03: Charging
1637 0x04: Selected battery not present (BIOS >= 1.2 only)
1638 0xff: Unknown
1639 5) Battery flag
1640 bit 0: High
1641 bit 1: Low
1642 bit 2: Critical
1643 bit 3: Charging
1644 bit 7: No system battery
1645 0xff: Unknown
1646 6) Remaining battery life (percentage of charge):
1647 0-100: valid
1648 -1: Unknown
1649 7) Remaining battery life (time units):
1650 Number of remaining minutes or seconds
1651 -1: Unknown
1652 8) min = minutes; sec = seconds */
1653
1654 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1655 driver_version,
1656 (apm_info.bios.version >> 8) & 0xff,
1657 apm_info.bios.version & 0xff,
1658 apm_info.bios.flags,
1659 ac_line_status,
1660 battery_status,
1661 battery_flag,
1662 percentage,
1663 time_units,
1664 units);
1665 return 0;
1666 }
1667
1668 static int proc_apm_open(struct inode *inode, struct file *file)
1669 {
1670 return single_open(file, proc_apm_show, NULL);
1671 }
1672
1673 static const struct file_operations apm_file_ops = {
1674 .owner = THIS_MODULE,
1675 .open = proc_apm_open,
1676 .read = seq_read,
1677 .llseek = seq_lseek,
1678 .release = single_release,
1679 };
1680
1681 static int apm(void *unused)
1682 {
1683 unsigned short bx;
1684 unsigned short cx;
1685 unsigned short dx;
1686 int error;
1687 char *power_stat;
1688 char *bat_stat;
1689
1690 #ifdef CONFIG_SMP
1691 /* 2002/08/01 - WT
1692 * This is to avoid random crashes at boot time during initialization
1693 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1694 * Some bioses don't like being called from CPU != 0.
1695 * Method suggested by Ingo Molnar.
1696 */
1697 set_cpus_allowed(current, cpumask_of_cpu(0));
1698 BUG_ON(smp_processor_id() != 0);
1699 #endif
1700
1701 if (apm_info.connection_version == 0) {
1702 apm_info.connection_version = apm_info.bios.version;
1703 if (apm_info.connection_version > 0x100) {
1704 /*
1705 * We only support BIOSs up to version 1.2
1706 */
1707 if (apm_info.connection_version > 0x0102)
1708 apm_info.connection_version = 0x0102;
1709 error = apm_driver_version(&apm_info.connection_version);
1710 if (error != APM_SUCCESS) {
1711 apm_error("driver version", error);
1712 /* Fall back to an APM 1.0 connection. */
1713 apm_info.connection_version = 0x100;
1714 }
1715 }
1716 }
1717
1718 if (debug)
1719 printk(KERN_INFO "apm: Connection version %d.%d\n",
1720 (apm_info.connection_version >> 8) & 0xff,
1721 apm_info.connection_version & 0xff);
1722
1723 #ifdef CONFIG_APM_DO_ENABLE
1724 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1725 /*
1726 * This call causes my NEC UltraLite Versa 33/C to hang if it
1727 * is booted with PM disabled but not in the docking station.
1728 * Unfortunate ...
1729 */
1730 error = apm_enable_power_management(1);
1731 if (error) {
1732 apm_error("enable power management", error);
1733 return -1;
1734 }
1735 }
1736 #endif
1737
1738 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1739 && (apm_info.connection_version > 0x0100)) {
1740 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1741 if (error) {
1742 apm_error("engage power management", error);
1743 return -1;
1744 }
1745 }
1746
1747 if (debug && (num_online_cpus() == 1 || smp)) {
1748 error = apm_get_power_status(&bx, &cx, &dx);
1749 if (error)
1750 printk(KERN_INFO "apm: power status not available\n");
1751 else {
1752 switch ((bx >> 8) & 0xff) {
1753 case 0:
1754 power_stat = "off line";
1755 break;
1756 case 1:
1757 power_stat = "on line";
1758 break;
1759 case 2:
1760 power_stat = "on backup power";
1761 break;
1762 default:
1763 power_stat = "unknown";
1764 break;
1765 }
1766 switch (bx & 0xff) {
1767 case 0:
1768 bat_stat = "high";
1769 break;
1770 case 1:
1771 bat_stat = "low";
1772 break;
1773 case 2:
1774 bat_stat = "critical";
1775 break;
1776 case 3:
1777 bat_stat = "charging";
1778 break;
1779 default:
1780 bat_stat = "unknown";
1781 break;
1782 }
1783 printk(KERN_INFO
1784 "apm: AC %s, battery status %s, battery life ",
1785 power_stat, bat_stat);
1786 if ((cx & 0xff) == 0xff)
1787 printk("unknown\n");
1788 else
1789 printk("%d%%\n", cx & 0xff);
1790 if (apm_info.connection_version > 0x100) {
1791 printk(KERN_INFO
1792 "apm: battery flag 0x%02x, battery life ",
1793 (cx >> 8) & 0xff);
1794 if (dx == 0xffff)
1795 printk("unknown\n");
1796 else
1797 printk("%d %s\n", dx & 0x7fff,
1798 (dx & 0x8000) ?
1799 "minutes" : "seconds");
1800 }
1801 }
1802 }
1803
1804 /* Install our power off handler.. */
1805 if (power_off)
1806 pm_power_off = apm_power_off;
1807
1808 if (num_online_cpus() == 1 || smp) {
1809 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1810 console_blank_hook = apm_console_blank;
1811 #endif
1812 apm_mainloop();
1813 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1814 console_blank_hook = NULL;
1815 #endif
1816 }
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 smp = !invert;
1851 idle_threshold = 100;
1852 }
1853 if ((strncmp(str, "allow-ints", 10) == 0) ||
1854 (strncmp(str, "allow_ints", 10) == 0))
1855 apm_info.allow_ints = !invert;
1856 if ((strncmp(str, "broken-psr", 10) == 0) ||
1857 (strncmp(str, "broken_psr", 10) == 0))
1858 apm_info.get_power_status_broken = !invert;
1859 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1860 (strncmp(str, "realmode_power_off", 18) == 0))
1861 apm_info.realmode_power_off = !invert;
1862 str = strchr(str, ',');
1863 if (str != NULL)
1864 str += strspn(str, ", \t");
1865 }
1866 return 1;
1867 }
1868
1869 __setup("apm=", apm_setup);
1870 #endif
1871
1872 static const struct file_operations apm_bios_fops = {
1873 .owner = THIS_MODULE,
1874 .read = do_read,
1875 .poll = do_poll,
1876 .ioctl = do_ioctl,
1877 .open = do_open,
1878 .release = do_release,
1879 };
1880
1881 static struct miscdevice apm_device = {
1882 APM_MINOR_DEV,
1883 "apm_bios",
1884 &apm_bios_fops
1885 };
1886
1887
1888 /* Simple "print if true" callback */
1889 static int __init print_if_true(const struct dmi_system_id *d)
1890 {
1891 printk("%s\n", d->ident);
1892 return 0;
1893 }
1894
1895 /*
1896 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1897 * disabled before the suspend. Linux used to get terribly confused by that.
1898 */
1899 static int __init broken_ps2_resume(const struct dmi_system_id *d)
1900 {
1901 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1902 "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(const 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. "
1912 "Using realmode poweroff only.\n", d->ident);
1913 }
1914 return 0;
1915 }
1916
1917 /* Some laptops require interrupts to be enabled during APM calls */
1918 static int __init set_apm_ints(const struct dmi_system_id *d)
1919 {
1920 if (apm_info.allow_ints == 0) {
1921 apm_info.allow_ints = 1;
1922 printk(KERN_INFO "%s machine detected. "
1923 "Enabling interrupts during APM calls.\n", d->ident);
1924 }
1925 return 0;
1926 }
1927
1928 /* Some APM bioses corrupt memory or just plain do not work */
1929 static int __init apm_is_horked(const struct dmi_system_id *d)
1930 {
1931 if (apm_info.disabled == 0) {
1932 apm_info.disabled = 1;
1933 printk(KERN_INFO "%s machine detected. "
1934 "Disabling APM.\n", d->ident);
1935 }
1936 return 0;
1937 }
1938
1939 static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1940 {
1941 if (apm_info.disabled == 0) {
1942 apm_info.disabled = 1;
1943 printk(KERN_INFO "%s machine detected. "
1944 "Disabling APM.\n", d->ident);
1945 printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n");
1946 printk(KERN_INFO "download from support.intel.com \n");
1947 }
1948 return 0;
1949 }
1950
1951 /* Some APM bioses hang on APM idle calls */
1952 static int __init apm_likes_to_melt(const struct dmi_system_id *d)
1953 {
1954 if (apm_info.forbid_idle == 0) {
1955 apm_info.forbid_idle = 1;
1956 printk(KERN_INFO "%s machine detected. "
1957 "Disabling APM idle calls.\n", d->ident);
1958 }
1959 return 0;
1960 }
1961
1962 /*
1963 * Check for clue free BIOS implementations who use
1964 * the following QA technique
1965 *
1966 * [ Write BIOS Code ]<------
1967 * | ^
1968 * < Does it Compile >----N--
1969 * |Y ^
1970 * < Does it Boot Win98 >-N--
1971 * |Y
1972 * [Ship It]
1973 *
1974 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
1975 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
1976 */
1977 static int __init broken_apm_power(const struct dmi_system_id *d)
1978 {
1979 apm_info.get_power_status_broken = 1;
1980 printk(KERN_WARNING "BIOS strings suggest APM bugs, "
1981 "disabling power status reporting.\n");
1982 return 0;
1983 }
1984
1985 /*
1986 * This bios swaps the APM minute reporting bytes over (Many sony laptops
1987 * have this problem).
1988 */
1989 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
1990 {
1991 apm_info.get_power_status_swabinminutes = 1;
1992 printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
1993 "in minutes and wrong byte order.\n");
1994 return 0;
1995 }
1996
1997 static struct dmi_system_id __initdata apm_dmi_table[] = {
1998 {
1999 print_if_true,
2000 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2001 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2002 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2003 },
2004 { /* Handle problems with APM on the C600 */
2005 broken_ps2_resume, "Dell Latitude C600",
2006 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2007 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2008 },
2009 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2010 set_apm_ints, "Dell Latitude",
2011 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2012 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2013 },
2014 { /* APM crashes */
2015 apm_is_horked, "Dell Inspiron 2500",
2016 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2017 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2018 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2019 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2020 },
2021 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2022 set_apm_ints, "Dell Inspiron", {
2023 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2024 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2025 },
2026 { /* Handle problems with APM on Inspiron 5000e */
2027 broken_apm_power, "Dell Inspiron 5000e",
2028 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2029 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2030 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2031 },
2032 { /* Handle problems with APM on Inspiron 2500 */
2033 broken_apm_power, "Dell Inspiron 2500",
2034 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2035 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2036 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2037 },
2038 { /* APM crashes */
2039 apm_is_horked, "Dell Dimension 4100",
2040 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2041 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2042 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2043 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2044 },
2045 { /* Allow interrupts during suspend on Compaq Laptops*/
2046 set_apm_ints, "Compaq 12XL125",
2047 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2048 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2049 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2050 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2051 },
2052 { /* Allow interrupts during APM or the clock goes slow */
2053 set_apm_ints, "ASUSTeK",
2054 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2055 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2056 },
2057 { /* APM blows on shutdown */
2058 apm_is_horked, "ABIT KX7-333[R]",
2059 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2060 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2061 },
2062 { /* APM crashes */
2063 apm_is_horked, "Trigem Delhi3",
2064 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2065 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2066 },
2067 { /* APM crashes */
2068 apm_is_horked, "Fujitsu-Siemens",
2069 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2070 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2071 },
2072 { /* APM crashes */
2073 apm_is_horked_d850md, "Intel D850MD",
2074 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2075 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2076 },
2077 { /* APM crashes */
2078 apm_is_horked, "Intel D810EMO",
2079 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2080 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2081 },
2082 { /* APM crashes */
2083 apm_is_horked, "Dell XPS-Z",
2084 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2085 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2086 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2087 },
2088 { /* APM crashes */
2089 apm_is_horked, "Sharp PC-PJ/AX",
2090 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2091 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2092 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2093 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2094 },
2095 { /* APM crashes */
2096 apm_is_horked, "Dell Inspiron 2500",
2097 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2098 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2099 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2100 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2101 },
2102 { /* APM idle hangs */
2103 apm_likes_to_melt, "Jabil AMD",
2104 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2105 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2106 },
2107 { /* APM idle hangs */
2108 apm_likes_to_melt, "AMI Bios",
2109 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2110 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2111 },
2112 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2113 swab_apm_power_in_minutes, "Sony VAIO",
2114 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2115 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2116 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2117 },
2118 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2119 swab_apm_power_in_minutes, "Sony VAIO",
2120 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2121 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2122 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2123 },
2124 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2125 swab_apm_power_in_minutes, "Sony VAIO",
2126 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2127 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2128 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2129 },
2130 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2131 swab_apm_power_in_minutes, "Sony VAIO",
2132 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2133 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2134 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2135 },
2136 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2137 swab_apm_power_in_minutes, "Sony VAIO",
2138 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2139 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2140 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2141 },
2142 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2143 swab_apm_power_in_minutes, "Sony VAIO",
2144 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2145 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2146 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2147 },
2148 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2149 swab_apm_power_in_minutes, "Sony VAIO",
2150 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2151 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2152 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2153 },
2154 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2155 swab_apm_power_in_minutes, "Sony VAIO",
2156 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2157 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2158 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2159 },
2160 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2161 swab_apm_power_in_minutes, "Sony VAIO",
2162 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2163 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2164 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2165 },
2166 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2167 swab_apm_power_in_minutes, "Sony VAIO",
2168 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2169 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2170 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2171 },
2172
2173 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2174 swab_apm_power_in_minutes, "Sony VAIO",
2175 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2176 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2177 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2178 },
2179 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2180 swab_apm_power_in_minutes, "Sony VAIO",
2181 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2182 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2183 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2184 },
2185 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2186 swab_apm_power_in_minutes, "Sony VAIO",
2187 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2188 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2189 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2190 },
2191 { /* broken PM poweroff bios */
2192 set_realmode_power_off, "Award Software v4.60 PGMA",
2193 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2194 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2195 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2196 },
2197
2198 /* Generic per vendor APM settings */
2199
2200 { /* Allow interrupts during suspend on IBM laptops */
2201 set_apm_ints, "IBM",
2202 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2203 },
2204
2205 { }
2206 };
2207
2208 /*
2209 * Just start the APM thread. We do NOT want to do APM BIOS
2210 * calls from anything but the APM thread, if for no other reason
2211 * than the fact that we don't trust the APM BIOS. This way,
2212 * most common APM BIOS problems that lead to protection errors
2213 * etc will have at least some level of being contained...
2214 *
2215 * In short, if something bad happens, at least we have a choice
2216 * of just killing the apm thread..
2217 */
2218 static int __init apm_init(void)
2219 {
2220 struct proc_dir_entry *apm_proc;
2221 struct desc_struct *gdt;
2222 int err;
2223
2224 dmi_check_system(apm_dmi_table);
2225
2226 if (apm_info.bios.version == 0 || paravirt_enabled()) {
2227 printk(KERN_INFO "apm: BIOS not found.\n");
2228 return -ENODEV;
2229 }
2230 printk(KERN_INFO
2231 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2232 ((apm_info.bios.version >> 8) & 0xff),
2233 (apm_info.bios.version & 0xff),
2234 apm_info.bios.flags,
2235 driver_version);
2236 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2237 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2238 return -ENODEV;
2239 }
2240
2241 if (allow_ints)
2242 apm_info.allow_ints = 1;
2243 if (broken_psr)
2244 apm_info.get_power_status_broken = 1;
2245 if (realmode_power_off)
2246 apm_info.realmode_power_off = 1;
2247 /* User can override, but default is to trust DMI */
2248 if (apm_disabled != -1)
2249 apm_info.disabled = apm_disabled;
2250
2251 /*
2252 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2253 * but is reportedly a 1.0 BIOS.
2254 */
2255 if (apm_info.bios.version == 0x001)
2256 apm_info.bios.version = 0x100;
2257
2258 /* BIOS < 1.2 doesn't set cseg_16_len */
2259 if (apm_info.bios.version < 0x102)
2260 apm_info.bios.cseg_16_len = 0; /* 64k */
2261
2262 if (debug) {
2263 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2264 apm_info.bios.cseg, apm_info.bios.offset,
2265 apm_info.bios.cseg_16, apm_info.bios.dseg);
2266 if (apm_info.bios.version > 0x100)
2267 printk(" cseg len %x, dseg len %x",
2268 apm_info.bios.cseg_len,
2269 apm_info.bios.dseg_len);
2270 if (apm_info.bios.version > 0x101)
2271 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2272 printk("\n");
2273 }
2274
2275 if (apm_info.disabled) {
2276 printk(KERN_NOTICE "apm: disabled on user request.\n");
2277 return -ENODEV;
2278 }
2279 if ((num_online_cpus() > 1) && !power_off && !smp) {
2280 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2281 apm_info.disabled = 1;
2282 return -ENODEV;
2283 }
2284 if (pm_flags & PM_ACPI) {
2285 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2286 apm_info.disabled = 1;
2287 return -ENODEV;
2288 }
2289 pm_flags |= PM_APM;
2290
2291 /*
2292 * Set up a segment that references the real mode segment 0x40
2293 * that extends up to the end of page zero (that we have reserved).
2294 * This is for buggy BIOS's that refer to (real mode) segment 0x40
2295 * even though they are called in protected mode.
2296 */
2297 set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
2298 _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
2299
2300 /*
2301 * Set up the long jump entry point to the APM BIOS, which is called
2302 * from inline assembly.
2303 */
2304 apm_bios_entry.offset = apm_info.bios.offset;
2305 apm_bios_entry.segment = APM_CS;
2306
2307 /*
2308 * The APM 1.1 BIOS is supposed to provide limit information that it
2309 * recognizes. Many machines do this correctly, but many others do
2310 * not restrict themselves to their claimed limit. When this happens,
2311 * they will cause a segmentation violation in the kernel at boot time.
2312 * Most BIOS's, however, will respect a 64k limit, so we use that.
2313 *
2314 * Note we only set APM segments on CPU zero, since we pin the APM
2315 * code to that CPU.
2316 */
2317 gdt = get_cpu_gdt_table(0);
2318 set_base(gdt[APM_CS >> 3],
2319 __va((unsigned long)apm_info.bios.cseg << 4));
2320 set_base(gdt[APM_CS_16 >> 3],
2321 __va((unsigned long)apm_info.bios.cseg_16 << 4));
2322 set_base(gdt[APM_DS >> 3],
2323 __va((unsigned long)apm_info.bios.dseg << 4));
2324
2325 apm_proc = create_proc_entry("apm", 0, NULL);
2326 if (apm_proc)
2327 apm_proc->proc_fops = &apm_file_ops;
2328
2329 kapmd_task = kthread_create(apm, NULL, "kapmd");
2330 if (IS_ERR(kapmd_task)) {
2331 printk(KERN_ERR "apm: disabled - Unable to start kernel "
2332 "thread.\n");
2333 err = PTR_ERR(kapmd_task);
2334 kapmd_task = NULL;
2335 remove_proc_entry("apm", NULL);
2336 return err;
2337 }
2338 wake_up_process(kapmd_task);
2339
2340 if (num_online_cpus() > 1 && !smp) {
2341 printk(KERN_NOTICE
2342 "apm: disabled - APM is not SMP safe (power off active).\n");
2343 return 0;
2344 }
2345
2346 /*
2347 * Note we don't actually care if the misc_device cannot be registered.
2348 * this driver can do its job without it, even if userspace can't
2349 * control it. just log the error
2350 */
2351 if (misc_register(&apm_device))
2352 printk(KERN_WARNING "apm: Could not register misc device.\n");
2353
2354 if (HZ != 100)
2355 idle_period = (idle_period * HZ) / 100;
2356 if (idle_threshold < 100) {
2357 original_pm_idle = pm_idle;
2358 pm_idle = apm_cpu_idle;
2359 set_pm_idle = 1;
2360 }
2361
2362 return 0;
2363 }
2364
2365 static void __exit apm_exit(void)
2366 {
2367 int error;
2368
2369 if (set_pm_idle) {
2370 pm_idle = original_pm_idle;
2371 /*
2372 * We are about to unload the current idle thread pm callback
2373 * (pm_idle), Wait for all processors to update cached/local
2374 * copies of pm_idle before proceeding.
2375 */
2376 cpu_idle_wait();
2377 }
2378 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2379 && (apm_info.connection_version > 0x0100)) {
2380 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2381 if (error)
2382 apm_error("disengage power management", error);
2383 }
2384 misc_deregister(&apm_device);
2385 remove_proc_entry("apm", NULL);
2386 if (power_off)
2387 pm_power_off = NULL;
2388 if (kapmd_task) {
2389 kthread_stop(kapmd_task);
2390 kapmd_task = NULL;
2391 }
2392 pm_flags &= ~PM_APM;
2393 }
2394
2395 module_init(apm_init);
2396 module_exit(apm_exit);
2397
2398 MODULE_AUTHOR("Stephen Rothwell");
2399 MODULE_DESCRIPTION("Advanced Power Management");
2400 MODULE_LICENSE("GPL");
2401 module_param(debug, bool, 0644);
2402 MODULE_PARM_DESC(debug, "Enable debug mode");
2403 module_param(power_off, bool, 0444);
2404 MODULE_PARM_DESC(power_off, "Enable power off");
2405 module_param(bounce_interval, int, 0444);
2406 MODULE_PARM_DESC(bounce_interval,
2407 "Set the number of ticks to ignore suspend bounces");
2408 module_param(allow_ints, bool, 0444);
2409 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2410 module_param(broken_psr, bool, 0444);
2411 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2412 module_param(realmode_power_off, bool, 0444);
2413 MODULE_PARM_DESC(realmode_power_off,
2414 "Switch to real mode before powering off");
2415 module_param(idle_threshold, int, 0444);
2416 MODULE_PARM_DESC(idle_threshold,
2417 "System idle percentage above which to make APM BIOS idle calls");
2418 module_param(idle_period, int, 0444);
2419 MODULE_PARM_DESC(idle_period,
2420 "Period (in sec/100) over which to caculate the idle percentage");
2421 module_param(smp, bool, 0444);
2422 MODULE_PARM_DESC(smp,
2423 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2424 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
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