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xen/pm_idle: Make pm_idle be default_idle under Xen.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / x86 / kernel / apm_32.c
blob0371c484bb8a38dfcd230ec6d7a58c4c62df3fdd
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 compiler/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@ucw.cz>
144 * modified by sfr).
145 * Disable interrupts while we are suspended (Andy Henroid
146 * <andy_henroid@yahoo.com> fixed by sfr).
147 * Make power off work on SMP again (Tony Hoyle
148 * <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr.
149 * Remove CONFIG_APM_SUSPEND_BOUNCE. The bounce ignore
150 * interval is now configurable.
151 * 1.14: Make connection version persist across module unload/load.
152 * Enable and engage power management earlier.
153 * Disengage power management on module unload.
154 * Changed to use the sysrq-register hack for registering the
155 * power off function called by magic sysrq based upon discussions
156 * in irc://irc.openprojects.net/#kernelnewbies
157 * (Crutcher Dunnavant <crutcher+kernel@datastacks.com>).
158 * Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable.
159 * (Arjan van de Ven <arjanv@redhat.com>) modified by sfr.
160 * Work around byte swap bug in one of the Vaio's BIOS's
161 * (Marc Boucher <marc@mbsi.ca>).
162 * Exposed the disable flag to dmi so that we can handle known
163 * broken APM (Alan Cox <alan@lxorguk.ukuu.org.uk>).
164 * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
165 * calling it - instead idle. (Alan Cox <alan@lxorguk.ukuu.org.uk>)
166 * If an APM idle fails log it and idle sensibly
167 * 1.15: Don't queue events to clients who open the device O_WRONLY.
168 * Don't expect replies from clients who open the device O_RDONLY.
169 * (Idea from Thomas Hood)
170 * Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>)
171 * 1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.)
172 * Notify listeners of standby or suspend events before notifying
173 * drivers. Return EBUSY to ioctl() if suspend is rejected.
174 * (Russell King <rmk@arm.linux.org.uk> and Thomas Hood)
175 * Ignore first resume after we generate our own resume event
176 * after a suspend (Thomas Hood)
177 * Daemonize now gets rid of our controlling terminal (sfr).
178 * CONFIG_APM_CPU_IDLE now just affects the default value of
179 * idle_threshold (sfr).
180 * Change name of kernel apm daemon (as it no longer idles) (sfr).
181 * 1.16ac: Fix up SMP support somewhat. You can now force SMP on and we
182 * make _all_ APM calls on the CPU#0. Fix unsafe sign bug.
183 * TODO: determine if its "boot CPU" or "CPU0" we want to lock to.
184 *
185 * APM 1.1 Reference:
186 *
187 * Intel Corporation, Microsoft Corporation. Advanced Power Management
188 * (APM) BIOS Interface Specification, Revision 1.1, September 1993.
189 * Intel Order Number 241704-001. Microsoft Part Number 781-110-X01.
190 *
191 * [This document is available free from Intel by calling 800.628.8686 (fax
192 * 916.356.6100) or 800.548.4725; or from
193 * http://www.microsoft.com/whdc/archive/amp_12.mspx 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/capability.h>
222 #include <linux/device.h>
223 #include <linux/kernel.h>
224 #include <linux/freezer.h>
225 #include <linux/smp.h>
226 #include <linux/dmi.h>
227 #include <linux/suspend.h>
228 #include <linux/kthread.h>
229 #include <linux/jiffies.h>
230 #include <linux/acpi.h>
231 #include <linux/syscore_ops.h>
232 #include <linux/i8253.h>
233
234 #include <asm/system.h>
235 #include <asm/uaccess.h>
236 #include <asm/desc.h>
237 #include <asm/olpc.h>
238 #include <asm/paravirt.h>
239 #include <asm/reboot.h>
240
241 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
242 extern int (*console_blank_hook)(int);
243 #endif
244
245 /*
246 * The apm_bios device is one of the misc char devices.
247 * This is its minor number.
248 */
249 #define APM_MINOR_DEV 134
250
251 /*
252 * See Documentation/Config.help for the configuration options.
253 *
254 * Various options can be changed at boot time as follows:
255 * (We allow underscores for compatibility with the modules code)
256 * apm=on/off enable/disable APM
257 * [no-]allow[-_]ints allow interrupts during BIOS calls
258 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
259 * [no-]realmode[-_]power[-_]off switch to real mode before
260 * powering off
261 * [no-]debug log some debugging messages
262 * [no-]power[-_]off power off on shutdown
263 * [no-]smp Use apm even on an SMP box
264 * bounce[-_]interval=<n> number of ticks to ignore suspend
265 * bounces
266 * idle[-_]threshold=<n> System idle percentage above which to
267 * make APM BIOS idle calls. Set it to
268 * 100 to disable.
269 * idle[-_]period=<n> Period (in 1/100s of a second) over
270 * which the idle percentage is
271 * calculated.
272 */
273
274 /* KNOWN PROBLEM MACHINES:
275 *
276 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
277 * [Confirmed by TI representative]
278 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
279 * [Confirmed by BIOS disassembly]
280 * [This may work now ...]
281 * P: Toshiba 1950S: battery life information only gets updated after resume
282 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
283 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
284 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
285 * Neale Banks <neale@lowendale.com.au> December 2000
286 *
287 * Legend: U = unusable with APM patches
288 * P = partially usable with APM patches
289 */
290
291 /*
292 * Define as 1 to make the driver always call the APM BIOS busy
293 * routine even if the clock was not reported as slowed by the
294 * idle routine. Otherwise, define as 0.
295 */
296 #define ALWAYS_CALL_BUSY 1
297
298 /*
299 * Define to make the APM BIOS calls zero all data segment registers (so
300 * that an incorrect BIOS implementation will cause a kernel panic if it
301 * tries to write to arbitrary memory).
302 */
303 #define APM_ZERO_SEGS
304
305 #include <asm/apm.h>
306
307 /*
308 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
309 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
310 * David Chen <chen@ctpa04.mit.edu>
311 */
312 #undef INIT_TIMER_AFTER_SUSPEND
313
314 #ifdef INIT_TIMER_AFTER_SUSPEND
315 #include <linux/timex.h>
316 #include <asm/io.h>
317 #include <linux/delay.h>
318 #endif
319
320 /*
321 * Need to poll the APM BIOS every second
322 */
323 #define APM_CHECK_TIMEOUT (HZ)
324
325 /*
326 * Ignore suspend events for this amount of time after a resume
327 */
328 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
329
330 /*
331 * Maximum number of events stored
332 */
333 #define APM_MAX_EVENTS 20
334
335 /*
336 * The per-file APM data
337 */
338 struct apm_user {
339 int magic;
340 struct apm_user *next;
341 unsigned int suser: 1;
342 unsigned int writer: 1;
343 unsigned int reader: 1;
344 unsigned int suspend_wait: 1;
345 int suspend_result;
346 int suspends_pending;
347 int standbys_pending;
348 int suspends_read;
349 int standbys_read;
350 int event_head;
351 int event_tail;
352 apm_event_t events[APM_MAX_EVENTS];
353 };
354
355 /*
356 * The magic number in apm_user
357 */
358 #define APM_BIOS_MAGIC 0x4101
359
360 /*
361 * idle percentage above which bios idle calls are done
362 */
363 #ifdef CONFIG_APM_CPU_IDLE
364 #warning deprecated CONFIG_APM_CPU_IDLE will be deleted in 2012
365 #define DEFAULT_IDLE_THRESHOLD 95
366 #else
367 #define DEFAULT_IDLE_THRESHOLD 100
368 #endif
369 #define DEFAULT_IDLE_PERIOD (100 / 3)
370
371 /*
372 * Local variables
373 */
374 static struct {
375 unsigned long offset;
376 unsigned short segment;
377 } apm_bios_entry;
378 static int clock_slowed;
379 static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
380 static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
381 static int set_pm_idle;
382 static int suspends_pending;
383 static int standbys_pending;
384 static int ignore_sys_suspend;
385 static int ignore_normal_resume;
386 static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
387
388 static int debug __read_mostly;
389 static int smp __read_mostly;
390 static int apm_disabled = -1;
391 #ifdef CONFIG_SMP
392 static int power_off;
393 #else
394 static int power_off = 1;
395 #endif
396 static int realmode_power_off;
397 #ifdef CONFIG_APM_ALLOW_INTS
398 static int allow_ints = 1;
399 #else
400 static int allow_ints;
401 #endif
402 static int broken_psr;
403
404 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
405 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
406 static struct apm_user *user_list;
407 static DEFINE_SPINLOCK(user_list_lock);
408 static DEFINE_MUTEX(apm_mutex);
409
410 /*
411 * Set up a segment that references the real mode segment 0x40
412 * that extends up to the end of page zero (that we have reserved).
413 * This is for buggy BIOS's that refer to (real mode) segment 0x40
414 * even though they are called in protected mode.
415 */
416 static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
417 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
418
419 static const char driver_version[] = "1.16ac"; /* no spaces */
420
421 static struct task_struct *kapmd_task;
422
423 /*
424 * APM event names taken from the APM 1.2 specification. These are
425 * the message codes that the BIOS uses to tell us about events
426 */
427 static const char * const apm_event_name[] = {
428 "system standby",
429 "system suspend",
430 "normal resume",
431 "critical resume",
432 "low battery",
433 "power status change",
434 "update time",
435 "critical suspend",
436 "user standby",
437 "user suspend",
438 "system standby resume",
439 "capabilities change"
440 };
441 #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
442
443 typedef struct lookup_t {
444 int key;
445 char *msg;
446 } lookup_t;
447
448 /*
449 * The BIOS returns a set of standard error codes in AX when the
450 * carry flag is set.
451 */
452
453 static const lookup_t error_table[] = {
454 /* N/A { APM_SUCCESS, "Operation succeeded" }, */
455 { APM_DISABLED, "Power management disabled" },
456 { APM_CONNECTED, "Real mode interface already connected" },
457 { APM_NOT_CONNECTED, "Interface not connected" },
458 { APM_16_CONNECTED, "16 bit interface already connected" },
459 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
460 { APM_32_CONNECTED, "32 bit interface already connected" },
461 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
462 { APM_BAD_DEVICE, "Unrecognized device ID" },
463 { APM_BAD_PARAM, "Parameter out of range" },
464 { APM_NOT_ENGAGED, "Interface not engaged" },
465 { APM_BAD_FUNCTION, "Function not supported" },
466 { APM_RESUME_DISABLED, "Resume timer disabled" },
467 { APM_BAD_STATE, "Unable to enter requested state" },
468 /* N/A { APM_NO_EVENTS, "No events pending" }, */
469 { APM_NO_ERROR, "BIOS did not set a return code" },
470 { APM_NOT_PRESENT, "No APM present" }
471 };
472 #define ERROR_COUNT ARRAY_SIZE(error_table)
473
474 /**
475 * apm_error - display an APM error
476 * @str: information string
477 * @err: APM BIOS return code
478 *
479 * Write a meaningful log entry to the kernel log in the event of
480 * an APM error. Note that this also handles (negative) kernel errors.
481 */
482
483 static void apm_error(char *str, int err)
484 {
485 int i;
486
487 for (i = 0; i < ERROR_COUNT; i++)
488 if (error_table[i].key == err)
489 break;
490 if (i < ERROR_COUNT)
491 printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
492 else if (err < 0)
493 printk(KERN_NOTICE "apm: %s: linux error code %i\n", str, err);
494 else
495 printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
496 str, err);
497 }
498
499 /*
500 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
501 * apm_info.allow_ints, we are being really paranoid here! Not only
502 * are interrupts disabled, but all the segment registers (except SS)
503 * are saved and zeroed this means that if the BIOS tries to reference
504 * any data without explicitly loading the segment registers, the kernel
505 * will fault immediately rather than have some unforeseen circumstances
506 * for the rest of the kernel. And it will be very obvious! :-) Doing
507 * this depends on CS referring to the same physical memory as DS so that
508 * DS can be zeroed before the call. Unfortunately, we can't do anything
509 * about the stack segment/pointer. Also, we tell the compiler that
510 * everything could change.
511 *
512 * Also, we KNOW that for the non error case of apm_bios_call, there
513 * is no useful data returned in the low order 8 bits of eax.
514 */
515
516 static inline unsigned long __apm_irq_save(void)
517 {
518 unsigned long flags;
519 local_save_flags(flags);
520 if (apm_info.allow_ints) {
521 if (irqs_disabled_flags(flags))
522 local_irq_enable();
523 } else
524 local_irq_disable();
525
526 return flags;
527 }
528
529 #define apm_irq_save(flags) \
530 do { flags = __apm_irq_save(); } while (0)
531
532 static inline void apm_irq_restore(unsigned long flags)
533 {
534 if (irqs_disabled_flags(flags))
535 local_irq_disable();
536 else if (irqs_disabled())
537 local_irq_enable();
538 }
539
540 #ifdef APM_ZERO_SEGS
541 # define APM_DECL_SEGS \
542 unsigned int saved_fs; unsigned int saved_gs;
543 # define APM_DO_SAVE_SEGS \
544 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
545 # define APM_DO_RESTORE_SEGS \
546 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
547 #else
548 # define APM_DECL_SEGS
549 # define APM_DO_SAVE_SEGS
550 # define APM_DO_RESTORE_SEGS
551 #endif
552
553 struct apm_bios_call {
554 u32 func;
555 /* In and out */
556 u32 ebx;
557 u32 ecx;
558 /* Out only */
559 u32 eax;
560 u32 edx;
561 u32 esi;
562
563 /* Error: -ENOMEM, or bits 8-15 of eax */
564 int err;
565 };
566
567 /**
568 * __apm_bios_call - Make an APM BIOS 32bit call
569 * @_call: pointer to struct apm_bios_call.
570 *
571 * Make an APM call using the 32bit protected mode interface. The
572 * caller is responsible for knowing if APM BIOS is configured and
573 * enabled. This call can disable interrupts for a long period of
574 * time on some laptops. The return value is in AH and the carry
575 * flag is loaded into AL. If there is an error, then the error
576 * code is returned in AH (bits 8-15 of eax) and this function
577 * returns non-zero.
578 *
579 * Note: this makes the call on the current CPU.
580 */
581 static long __apm_bios_call(void *_call)
582 {
583 APM_DECL_SEGS
584 unsigned long flags;
585 int cpu;
586 struct desc_struct save_desc_40;
587 struct desc_struct *gdt;
588 struct apm_bios_call *call = _call;
589
590 cpu = get_cpu();
591 BUG_ON(cpu != 0);
592 gdt = get_cpu_gdt_table(cpu);
593 save_desc_40 = gdt[0x40 / 8];
594 gdt[0x40 / 8] = bad_bios_desc;
595
596 apm_irq_save(flags);
597 APM_DO_SAVE_SEGS;
598 apm_bios_call_asm(call->func, call->ebx, call->ecx,
599 &call->eax, &call->ebx, &call->ecx, &call->edx,
600 &call->esi);
601 APM_DO_RESTORE_SEGS;
602 apm_irq_restore(flags);
603 gdt[0x40 / 8] = save_desc_40;
604 put_cpu();
605
606 return call->eax & 0xff;
607 }
608
609 /* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
610 static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
611 {
612 int ret;
613
614 /* Don't bother with work_on_cpu in the common case, so we don't
615 * have to worry about OOM or overhead. */
616 if (get_cpu() == 0) {
617 ret = fn(call);
618 put_cpu();
619 } else {
620 put_cpu();
621 ret = work_on_cpu(0, fn, call);
622 }
623
624 /* work_on_cpu can fail with -ENOMEM */
625 if (ret < 0)
626 call->err = ret;
627 else
628 call->err = (call->eax >> 8) & 0xff;
629
630 return ret;
631 }
632
633 /**
634 * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0)
635 * @call: the apm_bios_call registers.
636 *
637 * If there is an error, it is returned in @call.err.
638 */
639 static int apm_bios_call(struct apm_bios_call *call)
640 {
641 return on_cpu0(__apm_bios_call, call);
642 }
643
644 /**
645 * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
646 * @_call: pointer to struct apm_bios_call.
647 *
648 * Make a BIOS call that returns one value only, or just status.
649 * If there is an error, then the error code is returned in AH
650 * (bits 8-15 of eax) and this function returns non-zero (it can
651 * also return -ENOMEM). This is used for simpler BIOS operations.
652 * This call may hold interrupts off for a long time on some laptops.
653 *
654 * Note: this makes the call on the current CPU.
655 */
656 static long __apm_bios_call_simple(void *_call)
657 {
658 u8 error;
659 APM_DECL_SEGS
660 unsigned long flags;
661 int cpu;
662 struct desc_struct save_desc_40;
663 struct desc_struct *gdt;
664 struct apm_bios_call *call = _call;
665
666 cpu = get_cpu();
667 BUG_ON(cpu != 0);
668 gdt = get_cpu_gdt_table(cpu);
669 save_desc_40 = gdt[0x40 / 8];
670 gdt[0x40 / 8] = bad_bios_desc;
671
672 apm_irq_save(flags);
673 APM_DO_SAVE_SEGS;
674 error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
675 &call->eax);
676 APM_DO_RESTORE_SEGS;
677 apm_irq_restore(flags);
678 gdt[0x40 / 8] = save_desc_40;
679 put_cpu();
680 return error;
681 }
682
683 /**
684 * apm_bios_call_simple - make a simple APM BIOS 32bit call
685 * @func: APM function to invoke
686 * @ebx_in: EBX register value for BIOS call
687 * @ecx_in: ECX register value for BIOS call
688 * @eax: EAX register on return from the BIOS call
689 * @err: bits
690 *
691 * Make a BIOS call that returns one value only, or just status.
692 * If there is an error, then the error code is returned in @err
693 * and this function returns non-zero. This is used for simpler
694 * BIOS operations. This call may hold interrupts off for a long
695 * time on some laptops.
696 */
697 static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
698 int *err)
699 {
700 struct apm_bios_call call;
701 int ret;
702
703 call.func = func;
704 call.ebx = ebx_in;
705 call.ecx = ecx_in;
706
707 ret = on_cpu0(__apm_bios_call_simple, &call);
708 *eax = call.eax;
709 *err = call.err;
710 return ret;
711 }
712
713 /**
714 * apm_driver_version - APM driver version
715 * @val: loaded with the APM version on return
716 *
717 * Retrieve the APM version supported by the BIOS. This is only
718 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
719 * probably present.
720 *
721 * On entry val should point to a value indicating the APM driver
722 * version with the high byte being the major and the low byte the
723 * minor number both in BCD
724 *
725 * On return it will hold the BIOS revision supported in the
726 * same format.
727 */
728
729 static int apm_driver_version(u_short *val)
730 {
731 u32 eax;
732 int err;
733
734 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
735 return err;
736 *val = eax;
737 return APM_SUCCESS;
738 }
739
740 /**
741 * apm_get_event - get an APM event from the BIOS
742 * @event: pointer to the event
743 * @info: point to the event information
744 *
745 * The APM BIOS provides a polled information for event
746 * reporting. The BIOS expects to be polled at least every second
747 * when events are pending. When a message is found the caller should
748 * poll until no more messages are present. However, this causes
749 * problems on some laptops where a suspend event notification is
750 * not cleared until it is acknowledged.
751 *
752 * Additional information is returned in the info pointer, providing
753 * that APM 1.2 is in use. If no messges are pending the value 0x80
754 * is returned (No power management events pending).
755 */
756 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
757 {
758 struct apm_bios_call call;
759
760 call.func = APM_FUNC_GET_EVENT;
761 call.ebx = call.ecx = 0;
762
763 if (apm_bios_call(&call))
764 return call.err;
765
766 *event = call.ebx;
767 if (apm_info.connection_version < 0x0102)
768 *info = ~0; /* indicate info not valid */
769 else
770 *info = call.ecx;
771 return APM_SUCCESS;
772 }
773
774 /**
775 * set_power_state - set the power management state
776 * @what: which items to transition
777 * @state: state to transition to
778 *
779 * Request an APM change of state for one or more system devices. The
780 * processor state must be transitioned last of all. what holds the
781 * class of device in the upper byte and the device number (0xFF for
782 * all) for the object to be transitioned.
783 *
784 * The state holds the state to transition to, which may in fact
785 * be an acceptance of a BIOS requested state change.
786 */
787
788 static int set_power_state(u_short what, u_short state)
789 {
790 u32 eax;
791 int err;
792
793 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
794 return err;
795 return APM_SUCCESS;
796 }
797
798 /**
799 * set_system_power_state - set system wide power state
800 * @state: which state to enter
801 *
802 * Transition the entire system into a new APM power state.
803 */
804
805 static int set_system_power_state(u_short state)
806 {
807 return set_power_state(APM_DEVICE_ALL, state);
808 }
809
810 /**
811 * apm_do_idle - perform power saving
812 *
813 * This function notifies the BIOS that the processor is (in the view
814 * of the OS) idle. It returns -1 in the event that the BIOS refuses
815 * to handle the idle request. On a success the function returns 1
816 * if the BIOS did clock slowing or 0 otherwise.
817 */
818
819 static int apm_do_idle(void)
820 {
821 u32 eax;
822 u8 ret = 0;
823 int idled = 0;
824 int polling;
825 int err = 0;
826
827 polling = !!(current_thread_info()->status & TS_POLLING);
828 if (polling) {
829 current_thread_info()->status &= ~TS_POLLING;
830 /*
831 * TS_POLLING-cleared state must be visible before we
832 * test NEED_RESCHED:
833 */
834 smp_mb();
835 }
836 if (!need_resched()) {
837 idled = 1;
838 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
839 }
840 if (polling)
841 current_thread_info()->status |= TS_POLLING;
842
843 if (!idled)
844 return 0;
845
846 if (ret) {
847 static unsigned long t;
848
849 /* This always fails on some SMP boards running UP kernels.
850 * Only report the failure the first 5 times.
851 */
852 if (++t < 5) {
853 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
854 t = jiffies;
855 }
856 return -1;
857 }
858 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
859 return clock_slowed;
860 }
861
862 /**
863 * apm_do_busy - inform the BIOS the CPU is busy
864 *
865 * Request that the BIOS brings the CPU back to full performance.
866 */
867
868 static void apm_do_busy(void)
869 {
870 u32 dummy;
871 int err;
872
873 if (clock_slowed || ALWAYS_CALL_BUSY) {
874 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
875 clock_slowed = 0;
876 }
877 }
878
879 /*
880 * If no process has really been interested in
881 * the CPU for some time, we want to call BIOS
882 * power management - we probably want
883 * to conserve power.
884 */
885 #define IDLE_CALC_LIMIT (HZ * 100)
886 #define IDLE_LEAKY_MAX 16
887
888 static void (*original_pm_idle)(void) __read_mostly;
889
890 /**
891 * apm_cpu_idle - cpu idling for APM capable Linux
892 *
893 * This is the idling function the kernel executes when APM is available. It
894 * tries to do BIOS powermanagement based on the average system idle time.
895 * Furthermore it calls the system default idle routine.
896 */
897
898 static void apm_cpu_idle(void)
899 {
900 static int use_apm_idle; /* = 0 */
901 static unsigned int last_jiffies; /* = 0 */
902 static unsigned int last_stime; /* = 0 */
903
904 int apm_idle_done = 0;
905 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
906 unsigned int bucket;
907
908 WARN_ONCE(1, "deprecated apm_cpu_idle will be deleted in 2012");
909 recalc:
910 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
911 use_apm_idle = 0;
912 last_jiffies = jiffies;
913 last_stime = current->stime;
914 } else if (jiffies_since_last_check > idle_period) {
915 unsigned int idle_percentage;
916
917 idle_percentage = current->stime - last_stime;
918 idle_percentage *= 100;
919 idle_percentage /= jiffies_since_last_check;
920 use_apm_idle = (idle_percentage > idle_threshold);
921 if (apm_info.forbid_idle)
922 use_apm_idle = 0;
923 last_jiffies = jiffies;
924 last_stime = current->stime;
925 }
926
927 bucket = IDLE_LEAKY_MAX;
928
929 while (!need_resched()) {
930 if (use_apm_idle) {
931 unsigned int t;
932
933 t = jiffies;
934 switch (apm_do_idle()) {
935 case 0:
936 apm_idle_done = 1;
937 if (t != jiffies) {
938 if (bucket) {
939 bucket = IDLE_LEAKY_MAX;
940 continue;
941 }
942 } else if (bucket) {
943 bucket--;
944 continue;
945 }
946 break;
947 case 1:
948 apm_idle_done = 1;
949 break;
950 default: /* BIOS refused */
951 break;
952 }
953 }
954 if (original_pm_idle)
955 original_pm_idle();
956 else
957 default_idle();
958 local_irq_disable();
959 jiffies_since_last_check = jiffies - last_jiffies;
960 if (jiffies_since_last_check > idle_period)
961 goto recalc;
962 }
963
964 if (apm_idle_done)
965 apm_do_busy();
966
967 local_irq_enable();
968 }
969
970 /**
971 * apm_power_off - ask the BIOS to power off
972 *
973 * Handle the power off sequence. This is the one piece of code we
974 * will execute even on SMP machines. In order to deal with BIOS
975 * bugs we support real mode APM BIOS power off calls. We also make
976 * the SMP call on CPU0 as some systems will only honour this call
977 * on their first cpu.
978 */
979
980 static void apm_power_off(void)
981 {
982 /* Some bioses don't like being called from CPU != 0 */
983 if (apm_info.realmode_power_off) {
984 set_cpus_allowed_ptr(current, cpumask_of(0));
985 machine_real_restart(MRR_APM);
986 } else {
987 (void)set_system_power_state(APM_STATE_OFF);
988 }
989 }
990
991 #ifdef CONFIG_APM_DO_ENABLE
992
993 /**
994 * apm_enable_power_management - enable BIOS APM power management
995 * @enable: enable yes/no
996 *
997 * Enable or disable the APM BIOS power services.
998 */
999
1000 static int apm_enable_power_management(int enable)
1001 {
1002 u32 eax;
1003 int err;
1004
1005 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1006 return APM_NOT_ENGAGED;
1007 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1008 enable, &eax, &err))
1009 return err;
1010 if (enable)
1011 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1012 else
1013 apm_info.bios.flags |= APM_BIOS_DISABLED;
1014 return APM_SUCCESS;
1015 }
1016 #endif
1017
1018 /**
1019 * apm_get_power_status - get current power state
1020 * @status: returned status
1021 * @bat: battery info
1022 * @life: estimated life
1023 *
1024 * Obtain the current power status from the APM BIOS. We return a
1025 * status which gives the rough battery status, and current power
1026 * source. The bat value returned give an estimate as a percentage
1027 * of life and a status value for the battery. The estimated life
1028 * if reported is a lifetime in secodnds/minutes at current powwer
1029 * consumption.
1030 */
1031
1032 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1033 {
1034 struct apm_bios_call call;
1035
1036 call.func = APM_FUNC_GET_STATUS;
1037 call.ebx = APM_DEVICE_ALL;
1038 call.ecx = 0;
1039
1040 if (apm_info.get_power_status_broken)
1041 return APM_32_UNSUPPORTED;
1042 if (apm_bios_call(&call))
1043 return call.err;
1044 *status = call.ebx;
1045 *bat = call.ecx;
1046 if (apm_info.get_power_status_swabinminutes) {
1047 *life = swab16((u16)call.edx);
1048 *life |= 0x8000;
1049 } else
1050 *life = call.edx;
1051 return APM_SUCCESS;
1052 }
1053
1054 #if 0
1055 static int apm_get_battery_status(u_short which, u_short *status,
1056 u_short *bat, u_short *life, u_short *nbat)
1057 {
1058 u32 eax;
1059 u32 ebx;
1060 u32 ecx;
1061 u32 edx;
1062 u32 esi;
1063
1064 if (apm_info.connection_version < 0x0102) {
1065 /* pretend we only have one battery. */
1066 if (which != 1)
1067 return APM_BAD_DEVICE;
1068 *nbat = 1;
1069 return apm_get_power_status(status, bat, life);
1070 }
1071
1072 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1073 &ebx, &ecx, &edx, &esi))
1074 return (eax >> 8) & 0xff;
1075 *status = ebx;
1076 *bat = ecx;
1077 *life = edx;
1078 *nbat = esi;
1079 return APM_SUCCESS;
1080 }
1081 #endif
1082
1083 /**
1084 * apm_engage_power_management - enable PM on a device
1085 * @device: identity of device
1086 * @enable: on/off
1087 *
1088 * Activate or deactive power management on either a specific device
1089 * or the entire system (%APM_DEVICE_ALL).
1090 */
1091
1092 static int apm_engage_power_management(u_short device, int enable)
1093 {
1094 u32 eax;
1095 int err;
1096
1097 if ((enable == 0) && (device == APM_DEVICE_ALL)
1098 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1099 return APM_DISABLED;
1100 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1101 &eax, &err))
1102 return err;
1103 if (device == APM_DEVICE_ALL) {
1104 if (enable)
1105 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1106 else
1107 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1108 }
1109 return APM_SUCCESS;
1110 }
1111
1112 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1113
1114 /**
1115 * apm_console_blank - blank the display
1116 * @blank: on/off
1117 *
1118 * Attempt to blank the console, firstly by blanking just video device
1119 * zero, and if that fails (some BIOSes don't support it) then it blanks
1120 * all video devices. Typically the BIOS will do laptop backlight and
1121 * monitor powerdown for us.
1122 */
1123
1124 static int apm_console_blank(int blank)
1125 {
1126 int error = APM_NOT_ENGAGED; /* silence gcc */
1127 int i;
1128 u_short state;
1129 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1130
1131 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1132
1133 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1134 error = set_power_state(dev[i], state);
1135
1136 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1137 return 1;
1138
1139 if (error == APM_NOT_ENGAGED)
1140 break;
1141 }
1142
1143 if (error == APM_NOT_ENGAGED) {
1144 static int tried;
1145 int eng_error;
1146 if (tried++ == 0) {
1147 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1148 if (eng_error) {
1149 apm_error("set display", error);
1150 apm_error("engage interface", eng_error);
1151 return 0;
1152 } else
1153 return apm_console_blank(blank);
1154 }
1155 }
1156 apm_error("set display", error);
1157 return 0;
1158 }
1159 #endif
1160
1161 static int queue_empty(struct apm_user *as)
1162 {
1163 return as->event_head == as->event_tail;
1164 }
1165
1166 static apm_event_t get_queued_event(struct apm_user *as)
1167 {
1168 if (++as->event_tail >= APM_MAX_EVENTS)
1169 as->event_tail = 0;
1170 return as->events[as->event_tail];
1171 }
1172
1173 static void queue_event(apm_event_t event, struct apm_user *sender)
1174 {
1175 struct apm_user *as;
1176
1177 spin_lock(&user_list_lock);
1178 if (user_list == NULL)
1179 goto out;
1180 for (as = user_list; as != NULL; as = as->next) {
1181 if ((as == sender) || (!as->reader))
1182 continue;
1183 if (++as->event_head >= APM_MAX_EVENTS)
1184 as->event_head = 0;
1185
1186 if (as->event_head == as->event_tail) {
1187 static int notified;
1188
1189 if (notified++ == 0)
1190 printk(KERN_ERR "apm: an event queue overflowed\n");
1191 if (++as->event_tail >= APM_MAX_EVENTS)
1192 as->event_tail = 0;
1193 }
1194 as->events[as->event_head] = event;
1195 if (!as->suser || !as->writer)
1196 continue;
1197 switch (event) {
1198 case APM_SYS_SUSPEND:
1199 case APM_USER_SUSPEND:
1200 as->suspends_pending++;
1201 suspends_pending++;
1202 break;
1203
1204 case APM_SYS_STANDBY:
1205 case APM_USER_STANDBY:
1206 as->standbys_pending++;
1207 standbys_pending++;
1208 break;
1209 }
1210 }
1211 wake_up_interruptible(&apm_waitqueue);
1212 out:
1213 spin_unlock(&user_list_lock);
1214 }
1215
1216 static void reinit_timer(void)
1217 {
1218 #ifdef INIT_TIMER_AFTER_SUSPEND
1219 unsigned long flags;
1220
1221 raw_spin_lock_irqsave(&i8253_lock, flags);
1222 /* set the clock to HZ */
1223 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1224 udelay(10);
1225 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1226 udelay(10);
1227 outb_p(LATCH >> 8, PIT_CH0); /* MSB */
1228 udelay(10);
1229 raw_spin_unlock_irqrestore(&i8253_lock, flags);
1230 #endif
1231 }
1232
1233 static int suspend(int vetoable)
1234 {
1235 int err;
1236 struct apm_user *as;
1237
1238 dpm_suspend_start(PMSG_SUSPEND);
1239
1240 dpm_suspend_noirq(PMSG_SUSPEND);
1241
1242 local_irq_disable();
1243 syscore_suspend();
1244
1245 local_irq_enable();
1246
1247 save_processor_state();
1248 err = set_system_power_state(APM_STATE_SUSPEND);
1249 ignore_normal_resume = 1;
1250 restore_processor_state();
1251
1252 local_irq_disable();
1253 reinit_timer();
1254
1255 if (err == APM_NO_ERROR)
1256 err = APM_SUCCESS;
1257 if (err != APM_SUCCESS)
1258 apm_error("suspend", err);
1259 err = (err == APM_SUCCESS) ? 0 : -EIO;
1260
1261 syscore_resume();
1262 local_irq_enable();
1263
1264 dpm_resume_noirq(PMSG_RESUME);
1265
1266 dpm_resume_end(PMSG_RESUME);
1267 queue_event(APM_NORMAL_RESUME, NULL);
1268 spin_lock(&user_list_lock);
1269 for (as = user_list; as != NULL; as = as->next) {
1270 as->suspend_wait = 0;
1271 as->suspend_result = err;
1272 }
1273 spin_unlock(&user_list_lock);
1274 wake_up_interruptible(&apm_suspend_waitqueue);
1275 return err;
1276 }
1277
1278 static void standby(void)
1279 {
1280 int err;
1281
1282 dpm_suspend_noirq(PMSG_SUSPEND);
1283
1284 local_irq_disable();
1285 syscore_suspend();
1286 local_irq_enable();
1287
1288 err = set_system_power_state(APM_STATE_STANDBY);
1289 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1290 apm_error("standby", err);
1291
1292 local_irq_disable();
1293 syscore_resume();
1294 local_irq_enable();
1295
1296 dpm_resume_noirq(PMSG_RESUME);
1297 }
1298
1299 static apm_event_t get_event(void)
1300 {
1301 int error;
1302 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1303 apm_eventinfo_t info;
1304
1305 static int notified;
1306
1307 /* we don't use the eventinfo */
1308 error = apm_get_event(&event, &info);
1309 if (error == APM_SUCCESS)
1310 return event;
1311
1312 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1313 apm_error("get_event", error);
1314
1315 return 0;
1316 }
1317
1318 static void check_events(void)
1319 {
1320 apm_event_t event;
1321 static unsigned long last_resume;
1322 static int ignore_bounce;
1323
1324 while ((event = get_event()) != 0) {
1325 if (debug) {
1326 if (event <= NR_APM_EVENT_NAME)
1327 printk(KERN_DEBUG "apm: received %s notify\n",
1328 apm_event_name[event - 1]);
1329 else
1330 printk(KERN_DEBUG "apm: received unknown "
1331 "event 0x%02x\n", event);
1332 }
1333 if (ignore_bounce
1334 && (time_after(jiffies, last_resume + bounce_interval)))
1335 ignore_bounce = 0;
1336
1337 switch (event) {
1338 case APM_SYS_STANDBY:
1339 case APM_USER_STANDBY:
1340 queue_event(event, NULL);
1341 if (standbys_pending <= 0)
1342 standby();
1343 break;
1344
1345 case APM_USER_SUSPEND:
1346 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1347 if (apm_info.connection_version > 0x100)
1348 set_system_power_state(APM_STATE_REJECT);
1349 break;
1350 #endif
1351 case APM_SYS_SUSPEND:
1352 if (ignore_bounce) {
1353 if (apm_info.connection_version > 0x100)
1354 set_system_power_state(APM_STATE_REJECT);
1355 break;
1356 }
1357 /*
1358 * If we are already processing a SUSPEND,
1359 * then further SUSPEND events from the BIOS
1360 * will be ignored. We also return here to
1361 * cope with the fact that the Thinkpads keep
1362 * sending a SUSPEND event until something else
1363 * happens!
1364 */
1365 if (ignore_sys_suspend)
1366 return;
1367 ignore_sys_suspend = 1;
1368 queue_event(event, NULL);
1369 if (suspends_pending <= 0)
1370 (void) suspend(1);
1371 break;
1372
1373 case APM_NORMAL_RESUME:
1374 case APM_CRITICAL_RESUME:
1375 case APM_STANDBY_RESUME:
1376 ignore_sys_suspend = 0;
1377 last_resume = jiffies;
1378 ignore_bounce = 1;
1379 if ((event != APM_NORMAL_RESUME)
1380 || (ignore_normal_resume == 0)) {
1381 dpm_resume_end(PMSG_RESUME);
1382 queue_event(event, NULL);
1383 }
1384 ignore_normal_resume = 0;
1385 break;
1386
1387 case APM_CAPABILITY_CHANGE:
1388 case APM_LOW_BATTERY:
1389 case APM_POWER_STATUS_CHANGE:
1390 queue_event(event, NULL);
1391 /* If needed, notify drivers here */
1392 break;
1393
1394 case APM_UPDATE_TIME:
1395 break;
1396
1397 case APM_CRITICAL_SUSPEND:
1398 /*
1399 * We are not allowed to reject a critical suspend.
1400 */
1401 (void)suspend(0);
1402 break;
1403 }
1404 }
1405 }
1406
1407 static void apm_event_handler(void)
1408 {
1409 static int pending_count = 4;
1410 int err;
1411
1412 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1413 if ((apm_info.connection_version > 0x100) &&
1414 (pending_count-- <= 0)) {
1415 pending_count = 4;
1416 if (debug)
1417 printk(KERN_DEBUG "apm: setting state busy\n");
1418 err = set_system_power_state(APM_STATE_BUSY);
1419 if (err)
1420 apm_error("busy", err);
1421 }
1422 } else
1423 pending_count = 4;
1424 check_events();
1425 }
1426
1427 /*
1428 * This is the APM thread main loop.
1429 */
1430
1431 static void apm_mainloop(void)
1432 {
1433 DECLARE_WAITQUEUE(wait, current);
1434
1435 add_wait_queue(&apm_waitqueue, &wait);
1436 set_current_state(TASK_INTERRUPTIBLE);
1437 for (;;) {
1438 schedule_timeout(APM_CHECK_TIMEOUT);
1439 if (kthread_should_stop())
1440 break;
1441 /*
1442 * Ok, check all events, check for idle (and mark us sleeping
1443 * so as not to count towards the load average)..
1444 */
1445 set_current_state(TASK_INTERRUPTIBLE);
1446 apm_event_handler();
1447 }
1448 remove_wait_queue(&apm_waitqueue, &wait);
1449 }
1450
1451 static int check_apm_user(struct apm_user *as, const char *func)
1452 {
1453 if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1454 printk(KERN_ERR "apm: %s passed bad filp\n", func);
1455 return 1;
1456 }
1457 return 0;
1458 }
1459
1460 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1461 {
1462 struct apm_user *as;
1463 int i;
1464 apm_event_t event;
1465
1466 as = fp->private_data;
1467 if (check_apm_user(as, "read"))
1468 return -EIO;
1469 if ((int)count < sizeof(apm_event_t))
1470 return -EINVAL;
1471 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1472 return -EAGAIN;
1473 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1474 i = count;
1475 while ((i >= sizeof(event)) && !queue_empty(as)) {
1476 event = get_queued_event(as);
1477 if (copy_to_user(buf, &event, sizeof(event))) {
1478 if (i < count)
1479 break;
1480 return -EFAULT;
1481 }
1482 switch (event) {
1483 case APM_SYS_SUSPEND:
1484 case APM_USER_SUSPEND:
1485 as->suspends_read++;
1486 break;
1487
1488 case APM_SYS_STANDBY:
1489 case APM_USER_STANDBY:
1490 as->standbys_read++;
1491 break;
1492 }
1493 buf += sizeof(event);
1494 i -= sizeof(event);
1495 }
1496 if (i < count)
1497 return count - i;
1498 if (signal_pending(current))
1499 return -ERESTARTSYS;
1500 return 0;
1501 }
1502
1503 static unsigned int do_poll(struct file *fp, poll_table *wait)
1504 {
1505 struct apm_user *as;
1506
1507 as = fp->private_data;
1508 if (check_apm_user(as, "poll"))
1509 return 0;
1510 poll_wait(fp, &apm_waitqueue, wait);
1511 if (!queue_empty(as))
1512 return POLLIN | POLLRDNORM;
1513 return 0;
1514 }
1515
1516 static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1517 {
1518 struct apm_user *as;
1519 int ret;
1520
1521 as = filp->private_data;
1522 if (check_apm_user(as, "ioctl"))
1523 return -EIO;
1524 if (!as->suser || !as->writer)
1525 return -EPERM;
1526 switch (cmd) {
1527 case APM_IOC_STANDBY:
1528 mutex_lock(&apm_mutex);
1529 if (as->standbys_read > 0) {
1530 as->standbys_read--;
1531 as->standbys_pending--;
1532 standbys_pending--;
1533 } else
1534 queue_event(APM_USER_STANDBY, as);
1535 if (standbys_pending <= 0)
1536 standby();
1537 mutex_unlock(&apm_mutex);
1538 break;
1539 case APM_IOC_SUSPEND:
1540 mutex_lock(&apm_mutex);
1541 if (as->suspends_read > 0) {
1542 as->suspends_read--;
1543 as->suspends_pending--;
1544 suspends_pending--;
1545 } else
1546 queue_event(APM_USER_SUSPEND, as);
1547 if (suspends_pending <= 0) {
1548 ret = suspend(1);
1549 mutex_unlock(&apm_mutex);
1550 } else {
1551 as->suspend_wait = 1;
1552 mutex_unlock(&apm_mutex);
1553 wait_event_interruptible(apm_suspend_waitqueue,
1554 as->suspend_wait == 0);
1555 ret = as->suspend_result;
1556 }
1557 return ret;
1558 default:
1559 return -ENOTTY;
1560 }
1561 return 0;
1562 }
1563
1564 static int do_release(struct inode *inode, struct file *filp)
1565 {
1566 struct apm_user *as;
1567
1568 as = filp->private_data;
1569 if (check_apm_user(as, "release"))
1570 return 0;
1571 filp->private_data = NULL;
1572 if (as->standbys_pending > 0) {
1573 standbys_pending -= as->standbys_pending;
1574 if (standbys_pending <= 0)
1575 standby();
1576 }
1577 if (as->suspends_pending > 0) {
1578 suspends_pending -= as->suspends_pending;
1579 if (suspends_pending <= 0)
1580 (void) suspend(1);
1581 }
1582 spin_lock(&user_list_lock);
1583 if (user_list == as)
1584 user_list = as->next;
1585 else {
1586 struct apm_user *as1;
1587
1588 for (as1 = user_list;
1589 (as1 != NULL) && (as1->next != as);
1590 as1 = as1->next)
1591 ;
1592 if (as1 == NULL)
1593 printk(KERN_ERR "apm: filp not in user list\n");
1594 else
1595 as1->next = as->next;
1596 }
1597 spin_unlock(&user_list_lock);
1598 kfree(as);
1599 return 0;
1600 }
1601
1602 static int do_open(struct inode *inode, struct file *filp)
1603 {
1604 struct apm_user *as;
1605
1606 as = kmalloc(sizeof(*as), GFP_KERNEL);
1607 if (as == NULL) {
1608 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1609 sizeof(*as));
1610 return -ENOMEM;
1611 }
1612 as->magic = APM_BIOS_MAGIC;
1613 as->event_tail = as->event_head = 0;
1614 as->suspends_pending = as->standbys_pending = 0;
1615 as->suspends_read = as->standbys_read = 0;
1616 /*
1617 * XXX - this is a tiny bit broken, when we consider BSD
1618 * process accounting. If the device is opened by root, we
1619 * instantly flag that we used superuser privs. Who knows,
1620 * we might close the device immediately without doing a
1621 * privileged operation -- cevans
1622 */
1623 as->suser = capable(CAP_SYS_ADMIN);
1624 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1625 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1626 spin_lock(&user_list_lock);
1627 as->next = user_list;
1628 user_list = as;
1629 spin_unlock(&user_list_lock);
1630 filp->private_data = as;
1631 return 0;
1632 }
1633
1634 static int proc_apm_show(struct seq_file *m, void *v)
1635 {
1636 unsigned short bx;
1637 unsigned short cx;
1638 unsigned short dx;
1639 int error;
1640 unsigned short ac_line_status = 0xff;
1641 unsigned short battery_status = 0xff;
1642 unsigned short battery_flag = 0xff;
1643 int percentage = -1;
1644 int time_units = -1;
1645 char *units = "?";
1646
1647 if ((num_online_cpus() == 1) &&
1648 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1649 ac_line_status = (bx >> 8) & 0xff;
1650 battery_status = bx & 0xff;
1651 if ((cx & 0xff) != 0xff)
1652 percentage = cx & 0xff;
1653
1654 if (apm_info.connection_version > 0x100) {
1655 battery_flag = (cx >> 8) & 0xff;
1656 if (dx != 0xffff) {
1657 units = (dx & 0x8000) ? "min" : "sec";
1658 time_units = dx & 0x7fff;
1659 }
1660 }
1661 }
1662 /* Arguments, with symbols from linux/apm_bios.h. Information is
1663 from the Get Power Status (0x0a) call unless otherwise noted.
1664
1665 0) Linux driver version (this will change if format changes)
1666 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1667 2) APM flags from APM Installation Check (0x00):
1668 bit 0: APM_16_BIT_SUPPORT
1669 bit 1: APM_32_BIT_SUPPORT
1670 bit 2: APM_IDLE_SLOWS_CLOCK
1671 bit 3: APM_BIOS_DISABLED
1672 bit 4: APM_BIOS_DISENGAGED
1673 3) AC line status
1674 0x00: Off-line
1675 0x01: On-line
1676 0x02: On backup power (BIOS >= 1.1 only)
1677 0xff: Unknown
1678 4) Battery status
1679 0x00: High
1680 0x01: Low
1681 0x02: Critical
1682 0x03: Charging
1683 0x04: Selected battery not present (BIOS >= 1.2 only)
1684 0xff: Unknown
1685 5) Battery flag
1686 bit 0: High
1687 bit 1: Low
1688 bit 2: Critical
1689 bit 3: Charging
1690 bit 7: No system battery
1691 0xff: Unknown
1692 6) Remaining battery life (percentage of charge):
1693 0-100: valid
1694 -1: Unknown
1695 7) Remaining battery life (time units):
1696 Number of remaining minutes or seconds
1697 -1: Unknown
1698 8) min = minutes; sec = seconds */
1699
1700 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1701 driver_version,
1702 (apm_info.bios.version >> 8) & 0xff,
1703 apm_info.bios.version & 0xff,
1704 apm_info.bios.flags,
1705 ac_line_status,
1706 battery_status,
1707 battery_flag,
1708 percentage,
1709 time_units,
1710 units);
1711 return 0;
1712 }
1713
1714 static int proc_apm_open(struct inode *inode, struct file *file)
1715 {
1716 return single_open(file, proc_apm_show, NULL);
1717 }
1718
1719 static const struct file_operations apm_file_ops = {
1720 .owner = THIS_MODULE,
1721 .open = proc_apm_open,
1722 .read = seq_read,
1723 .llseek = seq_lseek,
1724 .release = single_release,
1725 };
1726
1727 static int apm(void *unused)
1728 {
1729 unsigned short bx;
1730 unsigned short cx;
1731 unsigned short dx;
1732 int error;
1733 char *power_stat;
1734 char *bat_stat;
1735
1736 /* 2002/08/01 - WT
1737 * This is to avoid random crashes at boot time during initialization
1738 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1739 * Some bioses don't like being called from CPU != 0.
1740 * Method suggested by Ingo Molnar.
1741 */
1742 set_cpus_allowed_ptr(current, cpumask_of(0));
1743 BUG_ON(smp_processor_id() != 0);
1744
1745 if (apm_info.connection_version == 0) {
1746 apm_info.connection_version = apm_info.bios.version;
1747 if (apm_info.connection_version > 0x100) {
1748 /*
1749 * We only support BIOSs up to version 1.2
1750 */
1751 if (apm_info.connection_version > 0x0102)
1752 apm_info.connection_version = 0x0102;
1753 error = apm_driver_version(&apm_info.connection_version);
1754 if (error != APM_SUCCESS) {
1755 apm_error("driver version", error);
1756 /* Fall back to an APM 1.0 connection. */
1757 apm_info.connection_version = 0x100;
1758 }
1759 }
1760 }
1761
1762 if (debug)
1763 printk(KERN_INFO "apm: Connection version %d.%d\n",
1764 (apm_info.connection_version >> 8) & 0xff,
1765 apm_info.connection_version & 0xff);
1766
1767 #ifdef CONFIG_APM_DO_ENABLE
1768 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1769 /*
1770 * This call causes my NEC UltraLite Versa 33/C to hang if it
1771 * is booted with PM disabled but not in the docking station.
1772 * Unfortunate ...
1773 */
1774 error = apm_enable_power_management(1);
1775 if (error) {
1776 apm_error("enable power management", error);
1777 return -1;
1778 }
1779 }
1780 #endif
1781
1782 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1783 && (apm_info.connection_version > 0x0100)) {
1784 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1785 if (error) {
1786 apm_error("engage power management", error);
1787 return -1;
1788 }
1789 }
1790
1791 if (debug && (num_online_cpus() == 1 || smp)) {
1792 error = apm_get_power_status(&bx, &cx, &dx);
1793 if (error)
1794 printk(KERN_INFO "apm: power status not available\n");
1795 else {
1796 switch ((bx >> 8) & 0xff) {
1797 case 0:
1798 power_stat = "off line";
1799 break;
1800 case 1:
1801 power_stat = "on line";
1802 break;
1803 case 2:
1804 power_stat = "on backup power";
1805 break;
1806 default:
1807 power_stat = "unknown";
1808 break;
1809 }
1810 switch (bx & 0xff) {
1811 case 0:
1812 bat_stat = "high";
1813 break;
1814 case 1:
1815 bat_stat = "low";
1816 break;
1817 case 2:
1818 bat_stat = "critical";
1819 break;
1820 case 3:
1821 bat_stat = "charging";
1822 break;
1823 default:
1824 bat_stat = "unknown";
1825 break;
1826 }
1827 printk(KERN_INFO
1828 "apm: AC %s, battery status %s, battery life ",
1829 power_stat, bat_stat);
1830 if ((cx & 0xff) == 0xff)
1831 printk("unknown\n");
1832 else
1833 printk("%d%%\n", cx & 0xff);
1834 if (apm_info.connection_version > 0x100) {
1835 printk(KERN_INFO
1836 "apm: battery flag 0x%02x, battery life ",
1837 (cx >> 8) & 0xff);
1838 if (dx == 0xffff)
1839 printk("unknown\n");
1840 else
1841 printk("%d %s\n", dx & 0x7fff,
1842 (dx & 0x8000) ?
1843 "minutes" : "seconds");
1844 }
1845 }
1846 }
1847
1848 /* Install our power off handler.. */
1849 if (power_off)
1850 pm_power_off = apm_power_off;
1851
1852 if (num_online_cpus() == 1 || smp) {
1853 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1854 console_blank_hook = apm_console_blank;
1855 #endif
1856 apm_mainloop();
1857 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1858 console_blank_hook = NULL;
1859 #endif
1860 }
1861
1862 return 0;
1863 }
1864
1865 #ifndef MODULE
1866 static int __init apm_setup(char *str)
1867 {
1868 int invert;
1869
1870 while ((str != NULL) && (*str != '\0')) {
1871 if (strncmp(str, "off", 3) == 0)
1872 apm_disabled = 1;
1873 if (strncmp(str, "on", 2) == 0)
1874 apm_disabled = 0;
1875 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1876 (strncmp(str, "bounce_interval=", 16) == 0))
1877 bounce_interval = simple_strtol(str + 16, NULL, 0);
1878 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1879 (strncmp(str, "idle_threshold=", 15) == 0))
1880 idle_threshold = simple_strtol(str + 15, NULL, 0);
1881 if ((strncmp(str, "idle-period=", 12) == 0) ||
1882 (strncmp(str, "idle_period=", 12) == 0))
1883 idle_period = simple_strtol(str + 12, NULL, 0);
1884 invert = (strncmp(str, "no-", 3) == 0) ||
1885 (strncmp(str, "no_", 3) == 0);
1886 if (invert)
1887 str += 3;
1888 if (strncmp(str, "debug", 5) == 0)
1889 debug = !invert;
1890 if ((strncmp(str, "power-off", 9) == 0) ||
1891 (strncmp(str, "power_off", 9) == 0))
1892 power_off = !invert;
1893 if (strncmp(str, "smp", 3) == 0) {
1894 smp = !invert;
1895 idle_threshold = 100;
1896 }
1897 if ((strncmp(str, "allow-ints", 10) == 0) ||
1898 (strncmp(str, "allow_ints", 10) == 0))
1899 apm_info.allow_ints = !invert;
1900 if ((strncmp(str, "broken-psr", 10) == 0) ||
1901 (strncmp(str, "broken_psr", 10) == 0))
1902 apm_info.get_power_status_broken = !invert;
1903 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1904 (strncmp(str, "realmode_power_off", 18) == 0))
1905 apm_info.realmode_power_off = !invert;
1906 str = strchr(str, ',');
1907 if (str != NULL)
1908 str += strspn(str, ", \t");
1909 }
1910 return 1;
1911 }
1912
1913 __setup("apm=", apm_setup);
1914 #endif
1915
1916 static const struct file_operations apm_bios_fops = {
1917 .owner = THIS_MODULE,
1918 .read = do_read,
1919 .poll = do_poll,
1920 .unlocked_ioctl = do_ioctl,
1921 .open = do_open,
1922 .release = do_release,
1923 .llseek = noop_llseek,
1924 };
1925
1926 static struct miscdevice apm_device = {
1927 APM_MINOR_DEV,
1928 "apm_bios",
1929 &apm_bios_fops
1930 };
1931
1932
1933 /* Simple "print if true" callback */
1934 static int __init print_if_true(const struct dmi_system_id *d)
1935 {
1936 printk("%s\n", d->ident);
1937 return 0;
1938 }
1939
1940 /*
1941 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1942 * disabled before the suspend. Linux used to get terribly confused by that.
1943 */
1944 static int __init broken_ps2_resume(const struct dmi_system_id *d)
1945 {
1946 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1947 "workaround hopefully not needed.\n", d->ident);
1948 return 0;
1949 }
1950
1951 /* Some bioses have a broken protected mode poweroff and need to use realmode */
1952 static int __init set_realmode_power_off(const struct dmi_system_id *d)
1953 {
1954 if (apm_info.realmode_power_off == 0) {
1955 apm_info.realmode_power_off = 1;
1956 printk(KERN_INFO "%s bios detected. "
1957 "Using realmode poweroff only.\n", d->ident);
1958 }
1959 return 0;
1960 }
1961
1962 /* Some laptops require interrupts to be enabled during APM calls */
1963 static int __init set_apm_ints(const struct dmi_system_id *d)
1964 {
1965 if (apm_info.allow_ints == 0) {
1966 apm_info.allow_ints = 1;
1967 printk(KERN_INFO "%s machine detected. "
1968 "Enabling interrupts during APM calls.\n", d->ident);
1969 }
1970 return 0;
1971 }
1972
1973 /* Some APM bioses corrupt memory or just plain do not work */
1974 static int __init apm_is_horked(const struct dmi_system_id *d)
1975 {
1976 if (apm_info.disabled == 0) {
1977 apm_info.disabled = 1;
1978 printk(KERN_INFO "%s machine detected. "
1979 "Disabling APM.\n", d->ident);
1980 }
1981 return 0;
1982 }
1983
1984 static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1985 {
1986 if (apm_info.disabled == 0) {
1987 apm_info.disabled = 1;
1988 printk(KERN_INFO "%s machine detected. "
1989 "Disabling APM.\n", d->ident);
1990 printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
1991 printk(KERN_INFO "download from support.intel.com\n");
1992 }
1993 return 0;
1994 }
1995
1996 /* Some APM bioses hang on APM idle calls */
1997 static int __init apm_likes_to_melt(const struct dmi_system_id *d)
1998 {
1999 if (apm_info.forbid_idle == 0) {
2000 apm_info.forbid_idle = 1;
2001 printk(KERN_INFO "%s machine detected. "
2002 "Disabling APM idle calls.\n", d->ident);
2003 }
2004 return 0;
2005 }
2006
2007 /*
2008 * Check for clue free BIOS implementations who use
2009 * the following QA technique
2010 *
2011 * [ Write BIOS Code ]<------
2012 * | ^
2013 * < Does it Compile >----N--
2014 * |Y ^
2015 * < Does it Boot Win98 >-N--
2016 * |Y
2017 * [Ship It]
2018 *
2019 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
2020 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
2021 */
2022 static int __init broken_apm_power(const struct dmi_system_id *d)
2023 {
2024 apm_info.get_power_status_broken = 1;
2025 printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2026 "disabling power status reporting.\n");
2027 return 0;
2028 }
2029
2030 /*
2031 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2032 * have this problem).
2033 */
2034 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2035 {
2036 apm_info.get_power_status_swabinminutes = 1;
2037 printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2038 "in minutes and wrong byte order.\n");
2039 return 0;
2040 }
2041
2042 static struct dmi_system_id __initdata apm_dmi_table[] = {
2043 {
2044 print_if_true,
2045 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2046 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2047 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2048 },
2049 { /* Handle problems with APM on the C600 */
2050 broken_ps2_resume, "Dell Latitude C600",
2051 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2052 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2053 },
2054 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2055 set_apm_ints, "Dell Latitude",
2056 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2057 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2058 },
2059 { /* APM crashes */
2060 apm_is_horked, "Dell Inspiron 2500",
2061 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2062 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2063 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2064 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2065 },
2066 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2067 set_apm_ints, "Dell Inspiron", {
2068 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2069 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2070 },
2071 { /* Handle problems with APM on Inspiron 5000e */
2072 broken_apm_power, "Dell Inspiron 5000e",
2073 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2074 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2075 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2076 },
2077 { /* Handle problems with APM on Inspiron 2500 */
2078 broken_apm_power, "Dell Inspiron 2500",
2079 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2080 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2081 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2082 },
2083 { /* APM crashes */
2084 apm_is_horked, "Dell Dimension 4100",
2085 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2086 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2087 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2088 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2089 },
2090 { /* Allow interrupts during suspend on Compaq Laptops*/
2091 set_apm_ints, "Compaq 12XL125",
2092 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2093 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2094 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2095 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2096 },
2097 { /* Allow interrupts during APM or the clock goes slow */
2098 set_apm_ints, "ASUSTeK",
2099 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2100 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2101 },
2102 { /* APM blows on shutdown */
2103 apm_is_horked, "ABIT KX7-333[R]",
2104 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2105 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2106 },
2107 { /* APM crashes */
2108 apm_is_horked, "Trigem Delhi3",
2109 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2110 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2111 },
2112 { /* APM crashes */
2113 apm_is_horked, "Fujitsu-Siemens",
2114 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2115 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2116 },
2117 { /* APM crashes */
2118 apm_is_horked_d850md, "Intel D850MD",
2119 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2120 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2121 },
2122 { /* APM crashes */
2123 apm_is_horked, "Intel D810EMO",
2124 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2125 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2126 },
2127 { /* APM crashes */
2128 apm_is_horked, "Dell XPS-Z",
2129 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2130 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2131 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2132 },
2133 { /* APM crashes */
2134 apm_is_horked, "Sharp PC-PJ/AX",
2135 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2136 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2137 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2138 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2139 },
2140 { /* APM crashes */
2141 apm_is_horked, "Dell Inspiron 2500",
2142 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2143 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2144 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2145 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2146 },
2147 { /* APM idle hangs */
2148 apm_likes_to_melt, "Jabil AMD",
2149 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2150 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2151 },
2152 { /* APM idle hangs */
2153 apm_likes_to_melt, "AMI Bios",
2154 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2155 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2156 },
2157 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2158 swab_apm_power_in_minutes, "Sony VAIO",
2159 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2160 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2161 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2162 },
2163 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2164 swab_apm_power_in_minutes, "Sony VAIO",
2165 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2166 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2167 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2168 },
2169 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2170 swab_apm_power_in_minutes, "Sony VAIO",
2171 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2172 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2173 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2174 },
2175 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2176 swab_apm_power_in_minutes, "Sony VAIO",
2177 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2178 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2179 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2180 },
2181 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2182 swab_apm_power_in_minutes, "Sony VAIO",
2183 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2184 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2185 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2186 },
2187 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2188 swab_apm_power_in_minutes, "Sony VAIO",
2189 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2190 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2191 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2192 },
2193 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2194 swab_apm_power_in_minutes, "Sony VAIO",
2195 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2196 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2197 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2198 },
2199 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2200 swab_apm_power_in_minutes, "Sony VAIO",
2201 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2202 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2203 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2204 },
2205 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2206 swab_apm_power_in_minutes, "Sony VAIO",
2207 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2208 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2209 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2210 },
2211 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2212 swab_apm_power_in_minutes, "Sony VAIO",
2213 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2214 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2215 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2216 },
2217
2218 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2219 swab_apm_power_in_minutes, "Sony VAIO",
2220 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2221 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2222 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2223 },
2224 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2225 swab_apm_power_in_minutes, "Sony VAIO",
2226 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2227 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2228 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2229 },
2230 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2231 swab_apm_power_in_minutes, "Sony VAIO",
2232 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2233 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2234 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2235 },
2236 { /* broken PM poweroff bios */
2237 set_realmode_power_off, "Award Software v4.60 PGMA",
2238 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2239 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2240 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2241 },
2242
2243 /* Generic per vendor APM settings */
2244
2245 { /* Allow interrupts during suspend on IBM laptops */
2246 set_apm_ints, "IBM",
2247 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2248 },
2249
2250 { }
2251 };
2252
2253 /*
2254 * Just start the APM thread. We do NOT want to do APM BIOS
2255 * calls from anything but the APM thread, if for no other reason
2256 * than the fact that we don't trust the APM BIOS. This way,
2257 * most common APM BIOS problems that lead to protection errors
2258 * etc will have at least some level of being contained...
2259 *
2260 * In short, if something bad happens, at least we have a choice
2261 * of just killing the apm thread..
2262 */
2263 static int __init apm_init(void)
2264 {
2265 struct desc_struct *gdt;
2266 int err;
2267
2268 dmi_check_system(apm_dmi_table);
2269
2270 if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) {
2271 printk(KERN_INFO "apm: BIOS not found.\n");
2272 return -ENODEV;
2273 }
2274 printk(KERN_INFO
2275 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2276 ((apm_info.bios.version >> 8) & 0xff),
2277 (apm_info.bios.version & 0xff),
2278 apm_info.bios.flags,
2279 driver_version);
2280 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2281 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2282 return -ENODEV;
2283 }
2284
2285 if (allow_ints)
2286 apm_info.allow_ints = 1;
2287 if (broken_psr)
2288 apm_info.get_power_status_broken = 1;
2289 if (realmode_power_off)
2290 apm_info.realmode_power_off = 1;
2291 /* User can override, but default is to trust DMI */
2292 if (apm_disabled != -1)
2293 apm_info.disabled = apm_disabled;
2294
2295 /*
2296 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2297 * but is reportedly a 1.0 BIOS.
2298 */
2299 if (apm_info.bios.version == 0x001)
2300 apm_info.bios.version = 0x100;
2301
2302 /* BIOS < 1.2 doesn't set cseg_16_len */
2303 if (apm_info.bios.version < 0x102)
2304 apm_info.bios.cseg_16_len = 0; /* 64k */
2305
2306 if (debug) {
2307 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2308 apm_info.bios.cseg, apm_info.bios.offset,
2309 apm_info.bios.cseg_16, apm_info.bios.dseg);
2310 if (apm_info.bios.version > 0x100)
2311 printk(" cseg len %x, dseg len %x",
2312 apm_info.bios.cseg_len,
2313 apm_info.bios.dseg_len);
2314 if (apm_info.bios.version > 0x101)
2315 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2316 printk("\n");
2317 }
2318
2319 if (apm_info.disabled) {
2320 printk(KERN_NOTICE "apm: disabled on user request.\n");
2321 return -ENODEV;
2322 }
2323 if ((num_online_cpus() > 1) && !power_off && !smp) {
2324 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2325 apm_info.disabled = 1;
2326 return -ENODEV;
2327 }
2328 if (!acpi_disabled) {
2329 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2330 apm_info.disabled = 1;
2331 return -ENODEV;
2332 }
2333
2334 /*
2335 * Set up the long jump entry point to the APM BIOS, which is called
2336 * from inline assembly.
2337 */
2338 apm_bios_entry.offset = apm_info.bios.offset;
2339 apm_bios_entry.segment = APM_CS;
2340
2341 /*
2342 * The APM 1.1 BIOS is supposed to provide limit information that it
2343 * recognizes. Many machines do this correctly, but many others do
2344 * not restrict themselves to their claimed limit. When this happens,
2345 * they will cause a segmentation violation in the kernel at boot time.
2346 * Most BIOS's, however, will respect a 64k limit, so we use that.
2347 *
2348 * Note we only set APM segments on CPU zero, since we pin the APM
2349 * code to that CPU.
2350 */
2351 gdt = get_cpu_gdt_table(0);
2352 set_desc_base(&gdt[APM_CS >> 3],
2353 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2354 set_desc_base(&gdt[APM_CS_16 >> 3],
2355 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2356 set_desc_base(&gdt[APM_DS >> 3],
2357 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2358
2359 proc_create("apm", 0, NULL, &apm_file_ops);
2360
2361 kapmd_task = kthread_create(apm, NULL, "kapmd");
2362 if (IS_ERR(kapmd_task)) {
2363 printk(KERN_ERR "apm: disabled - Unable to start kernel "
2364 "thread.\n");
2365 err = PTR_ERR(kapmd_task);
2366 kapmd_task = NULL;
2367 remove_proc_entry("apm", NULL);
2368 return err;
2369 }
2370 wake_up_process(kapmd_task);
2371
2372 if (num_online_cpus() > 1 && !smp) {
2373 printk(KERN_NOTICE
2374 "apm: disabled - APM is not SMP safe (power off active).\n");
2375 return 0;
2376 }
2377
2378 /*
2379 * Note we don't actually care if the misc_device cannot be registered.
2380 * this driver can do its job without it, even if userspace can't
2381 * control it. just log the error
2382 */
2383 if (misc_register(&apm_device))
2384 printk(KERN_WARNING "apm: Could not register misc device.\n");
2385
2386 if (HZ != 100)
2387 idle_period = (idle_period * HZ) / 100;
2388 if (idle_threshold < 100) {
2389 original_pm_idle = pm_idle;
2390 pm_idle = apm_cpu_idle;
2391 set_pm_idle = 1;
2392 }
2393
2394 return 0;
2395 }
2396
2397 static void __exit apm_exit(void)
2398 {
2399 int error;
2400
2401 if (set_pm_idle) {
2402 pm_idle = original_pm_idle;
2403 /*
2404 * We are about to unload the current idle thread pm callback
2405 * (pm_idle), Wait for all processors to update cached/local
2406 * copies of pm_idle before proceeding.
2407 */
2408 cpu_idle_wait();
2409 }
2410 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2411 && (apm_info.connection_version > 0x0100)) {
2412 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2413 if (error)
2414 apm_error("disengage power management", error);
2415 }
2416 misc_deregister(&apm_device);
2417 remove_proc_entry("apm", NULL);
2418 if (power_off)
2419 pm_power_off = NULL;
2420 if (kapmd_task) {
2421 kthread_stop(kapmd_task);
2422 kapmd_task = NULL;
2423 }
2424 }
2425
2426 module_init(apm_init);
2427 module_exit(apm_exit);
2428
2429 MODULE_AUTHOR("Stephen Rothwell");
2430 MODULE_DESCRIPTION("Advanced Power Management");
2431 MODULE_LICENSE("GPL");
2432 module_param(debug, bool, 0644);
2433 MODULE_PARM_DESC(debug, "Enable debug mode");
2434 module_param(power_off, bool, 0444);
2435 MODULE_PARM_DESC(power_off, "Enable power off");
2436 module_param(bounce_interval, int, 0444);
2437 MODULE_PARM_DESC(bounce_interval,
2438 "Set the number of ticks to ignore suspend bounces");
2439 module_param(allow_ints, bool, 0444);
2440 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2441 module_param(broken_psr, bool, 0444);
2442 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2443 module_param(realmode_power_off, bool, 0444);
2444 MODULE_PARM_DESC(realmode_power_off,
2445 "Switch to real mode before powering off");
2446 module_param(idle_threshold, int, 0444);
2447 MODULE_PARM_DESC(idle_threshold,
2448 "System idle percentage above which to make APM BIOS idle calls");
2449 module_param(idle_period, int, 0444);
2450 MODULE_PARM_DESC(idle_period,
2451 "Period (in sec/100) over which to caculate the idle percentage");
2452 module_param(smp, bool, 0444);
2453 MODULE_PARM_DESC(smp,
2454 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2455 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree