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[linux-rt-nao.git] / arch / x86 / kernel / apm_32.c
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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@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 via anonymous ftp from
193 * ftp://ftp.intel.com/pub/IAL/software_specs/apmv11.doc. It is also
194 * available from Microsoft by calling 206.882.8080.]
195 *
196 * APM 1.2 Reference:
197 * Intel Corporation, Microsoft Corporation. Advanced Power Management
198 * (APM) BIOS Interface Specification, Revision 1.2, February 1996.
199 *
200 * [This document is available from Microsoft at:
201 * http://www.microsoft.com/whdc/archive/amp_12.mspx]
202 */
203
204 #include <linux/module.h>
205
206 #include <linux/poll.h>
207 #include <linux/smp_lock.h>
208 #include <linux/types.h>
209 #include <linux/stddef.h>
210 #include <linux/timer.h>
211 #include <linux/fcntl.h>
212 #include <linux/slab.h>
213 #include <linux/stat.h>
214 #include <linux/proc_fs.h>
215 #include <linux/seq_file.h>
216 #include <linux/miscdevice.h>
217 #include <linux/apm_bios.h>
218 #include <linux/init.h>
219 #include <linux/time.h>
220 #include <linux/sched.h>
221 #include <linux/pm.h>
222 #include <linux/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/olpc.h>
237 #include <asm/paravirt.h>
238 #include <asm/reboot.h>
239
240 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
241 extern int (*console_blank_hook)(int);
242 #endif
243
244 /*
245 * The apm_bios device is one of the misc char devices.
246 * This is its minor number.
247 */
248 #define APM_MINOR_DEV 134
249
250 /*
251 * See Documentation/Config.help for the configuration options.
252 *
253 * Various options can be changed at boot time as follows:
254 * (We allow underscores for compatibility with the modules code)
255 * apm=on/off enable/disable APM
256 * [no-]allow[-_]ints allow interrupts during BIOS calls
257 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
258 * [no-]realmode[-_]power[-_]off switch to real mode before
259 * powering off
260 * [no-]debug log some debugging messages
261 * [no-]power[-_]off power off on shutdown
262 * [no-]smp Use apm even on an SMP box
263 * bounce[-_]interval=<n> number of ticks to ignore suspend
264 * bounces
265 * idle[-_]threshold=<n> System idle percentage above which to
266 * make APM BIOS idle calls. Set it to
267 * 100 to disable.
268 * idle[-_]period=<n> Period (in 1/100s of a second) over
269 * which the idle percentage is
270 * calculated.
271 */
272
273 /* KNOWN PROBLEM MACHINES:
274 *
275 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
276 * [Confirmed by TI representative]
277 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
278 * [Confirmed by BIOS disassembly]
279 * [This may work now ...]
280 * P: Toshiba 1950S: battery life information only gets updated after resume
281 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
282 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
283 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
284 * Neale Banks <neale@lowendale.com.au> December 2000
285 *
286 * Legend: U = unusable with APM patches
287 * P = partially usable with APM patches
288 */
289
290 /*
291 * Define as 1 to make the driver always call the APM BIOS busy
292 * routine even if the clock was not reported as slowed by the
293 * idle routine. Otherwise, define as 0.
294 */
295 #define ALWAYS_CALL_BUSY 1
296
297 /*
298 * Define to make the APM BIOS calls zero all data segment registers (so
299 * that an incorrect BIOS implementation will cause a kernel panic if it
300 * tries to write to arbitrary memory).
301 */
302 #define APM_ZERO_SEGS
303
304 #include <asm/apm.h>
305
306 /*
307 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
308 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
309 * David Chen <chen@ctpa04.mit.edu>
310 */
311 #undef INIT_TIMER_AFTER_SUSPEND
312
313 #ifdef INIT_TIMER_AFTER_SUSPEND
314 #include <linux/timex.h>
315 #include <asm/io.h>
316 #include <linux/delay.h>
317 #endif
318
319 /*
320 * Need to poll the APM BIOS every second
321 */
322 #define APM_CHECK_TIMEOUT (HZ)
323
324 /*
325 * Ignore suspend events for this amount of time after a resume
326 */
327 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
328
329 /*
330 * Maximum number of events stored
331 */
332 #define APM_MAX_EVENTS 20
333
334 /*
335 * The per-file APM data
336 */
337 struct apm_user {
338 int magic;
339 struct apm_user *next;
340 unsigned int suser: 1;
341 unsigned int writer: 1;
342 unsigned int reader: 1;
343 unsigned int suspend_wait: 1;
344 int suspend_result;
345 int suspends_pending;
346 int standbys_pending;
347 int suspends_read;
348 int standbys_read;
349 int event_head;
350 int event_tail;
351 apm_event_t events[APM_MAX_EVENTS];
352 };
353
354 /*
355 * The magic number in apm_user
356 */
357 #define APM_BIOS_MAGIC 0x4101
358
359 /*
360 * idle percentage above which bios idle calls are done
361 */
362 #ifdef CONFIG_APM_CPU_IDLE
363 #define DEFAULT_IDLE_THRESHOLD 95
364 #else
365 #define DEFAULT_IDLE_THRESHOLD 100
366 #endif
367 #define DEFAULT_IDLE_PERIOD (100 / 3)
368
369 /*
370 * Local variables
371 */
372 static struct {
373 unsigned long offset;
374 unsigned short segment;
375 } apm_bios_entry;
376 static int clock_slowed;
377 static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
378 static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
379 static int set_pm_idle;
380 static int suspends_pending;
381 static int standbys_pending;
382 static int ignore_sys_suspend;
383 static int ignore_normal_resume;
384 static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
385
386 static int debug __read_mostly;
387 static int smp __read_mostly;
388 static int apm_disabled = -1;
389 #ifdef CONFIG_SMP
390 static int power_off;
391 #else
392 static int power_off = 1;
393 #endif
394 static int realmode_power_off;
395 #ifdef CONFIG_APM_ALLOW_INTS
396 static int allow_ints = 1;
397 #else
398 static int allow_ints;
399 #endif
400 static int broken_psr;
401
402 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
403 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
404 static struct apm_user *user_list;
405 static DEFINE_SPINLOCK(user_list_lock);
406 static const struct desc_struct bad_bios_desc = { { { 0, 0x00409200 } } };
407
408 static const char driver_version[] = "1.16ac"; /* no spaces */
409
410 static struct task_struct *kapmd_task;
411
412 /*
413 * APM event names taken from the APM 1.2 specification. These are
414 * the message codes that the BIOS uses to tell us about events
415 */
416 static const char * const apm_event_name[] = {
417 "system standby",
418 "system suspend",
419 "normal resume",
420 "critical resume",
421 "low battery",
422 "power status change",
423 "update time",
424 "critical suspend",
425 "user standby",
426 "user suspend",
427 "system standby resume",
428 "capabilities change"
429 };
430 #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
431
432 typedef struct lookup_t {
433 int key;
434 char *msg;
435 } lookup_t;
436
437 /*
438 * The BIOS returns a set of standard error codes in AX when the
439 * carry flag is set.
440 */
441
442 static const lookup_t error_table[] = {
443 /* N/A { APM_SUCCESS, "Operation succeeded" }, */
444 { APM_DISABLED, "Power management disabled" },
445 { APM_CONNECTED, "Real mode interface already connected" },
446 { APM_NOT_CONNECTED, "Interface not connected" },
447 { APM_16_CONNECTED, "16 bit interface already connected" },
448 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
449 { APM_32_CONNECTED, "32 bit interface already connected" },
450 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
451 { APM_BAD_DEVICE, "Unrecognized device ID" },
452 { APM_BAD_PARAM, "Parameter out of range" },
453 { APM_NOT_ENGAGED, "Interface not engaged" },
454 { APM_BAD_FUNCTION, "Function not supported" },
455 { APM_RESUME_DISABLED, "Resume timer disabled" },
456 { APM_BAD_STATE, "Unable to enter requested state" },
457 /* N/A { APM_NO_EVENTS, "No events pending" }, */
458 { APM_NO_ERROR, "BIOS did not set a return code" },
459 { APM_NOT_PRESENT, "No APM present" }
460 };
461 #define ERROR_COUNT ARRAY_SIZE(error_table)
462
463 /**
464 * apm_error - display an APM error
465 * @str: information string
466 * @err: APM BIOS return code
467 *
468 * Write a meaningful log entry to the kernel log in the event of
469 * an APM error. Note that this also handles (negative) kernel errors.
470 */
471
472 static void apm_error(char *str, int err)
473 {
474 int i;
475
476 for (i = 0; i < ERROR_COUNT; i++)
477 if (error_table[i].key == err)
478 break;
479 if (i < ERROR_COUNT)
480 printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
481 else if (err < 0)
482 printk(KERN_NOTICE "apm: %s: linux error code %i\n", str, err);
483 else
484 printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
485 str, err);
486 }
487
488 /*
489 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
490 * apm_info.allow_ints, we are being really paranoid here! Not only
491 * are interrupts disabled, but all the segment registers (except SS)
492 * are saved and zeroed this means that if the BIOS tries to reference
493 * any data without explicitly loading the segment registers, the kernel
494 * will fault immediately rather than have some unforeseen circumstances
495 * for the rest of the kernel. And it will be very obvious! :-) Doing
496 * this depends on CS referring to the same physical memory as DS so that
497 * DS can be zeroed before the call. Unfortunately, we can't do anything
498 * about the stack segment/pointer. Also, we tell the compiler that
499 * everything could change.
500 *
501 * Also, we KNOW that for the non error case of apm_bios_call, there
502 * is no useful data returned in the low order 8 bits of eax.
503 */
504
505 static inline unsigned long __apm_irq_save(void)
506 {
507 unsigned long flags;
508 local_save_flags(flags);
509 if (apm_info.allow_ints) {
510 if (irqs_disabled_flags(flags))
511 local_irq_enable();
512 } else
513 local_irq_disable();
514
515 return flags;
516 }
517
518 #define apm_irq_save(flags) \
519 do { flags = __apm_irq_save(); } while (0)
520
521 static inline void apm_irq_restore(unsigned long flags)
522 {
523 if (irqs_disabled_flags(flags))
524 local_irq_disable();
525 else if (irqs_disabled())
526 local_irq_enable();
527 }
528
529 #ifdef APM_ZERO_SEGS
530 # define APM_DECL_SEGS \
531 unsigned int saved_fs; unsigned int saved_gs;
532 # define APM_DO_SAVE_SEGS \
533 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
534 # define APM_DO_RESTORE_SEGS \
535 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
536 #else
537 # define APM_DECL_SEGS
538 # define APM_DO_SAVE_SEGS
539 # define APM_DO_RESTORE_SEGS
540 #endif
541
542 struct apm_bios_call {
543 u32 func;
544 /* In and out */
545 u32 ebx;
546 u32 ecx;
547 /* Out only */
548 u32 eax;
549 u32 edx;
550 u32 esi;
551
552 /* Error: -ENOMEM, or bits 8-15 of eax */
553 int err;
554 };
555
556 /**
557 * __apm_bios_call - Make an APM BIOS 32bit call
558 * @_call: pointer to struct apm_bios_call.
559 *
560 * Make an APM call using the 32bit protected mode interface. The
561 * caller is responsible for knowing if APM BIOS is configured and
562 * enabled. This call can disable interrupts for a long period of
563 * time on some laptops. The return value is in AH and the carry
564 * flag is loaded into AL. If there is an error, then the error
565 * code is returned in AH (bits 8-15 of eax) and this function
566 * returns non-zero.
567 *
568 * Note: this makes the call on the current CPU.
569 */
570 static long __apm_bios_call(void *_call)
571 {
572 APM_DECL_SEGS
573 unsigned long flags;
574 int cpu;
575 struct desc_struct save_desc_40;
576 struct desc_struct *gdt;
577 struct apm_bios_call *call = _call;
578
579 cpu = get_cpu();
580 BUG_ON(cpu != 0);
581 gdt = get_cpu_gdt_table(cpu);
582 save_desc_40 = gdt[0x40 / 8];
583 gdt[0x40 / 8] = bad_bios_desc;
584
585 apm_irq_save(flags);
586 APM_DO_SAVE_SEGS;
587 apm_bios_call_asm(call->func, call->ebx, call->ecx,
588 &call->eax, &call->ebx, &call->ecx, &call->edx,
589 &call->esi);
590 APM_DO_RESTORE_SEGS;
591 apm_irq_restore(flags);
592 gdt[0x40 / 8] = save_desc_40;
593 put_cpu();
594
595 return call->eax & 0xff;
596 }
597
598 /* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
599 static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
600 {
601 int ret;
602
603 /* Don't bother with work_on_cpu in the common case, so we don't
604 * have to worry about OOM or overhead. */
605 if (get_cpu() == 0) {
606 ret = fn(call);
607 put_cpu();
608 } else {
609 put_cpu();
610 ret = work_on_cpu(0, fn, call);
611 }
612
613 /* work_on_cpu can fail with -ENOMEM */
614 if (ret < 0)
615 call->err = ret;
616 else
617 call->err = (call->eax >> 8) & 0xff;
618
619 return ret;
620 }
621
622 /**
623 * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0)
624 * @call: the apm_bios_call registers.
625 *
626 * If there is an error, it is returned in @call.err.
627 */
628 static int apm_bios_call(struct apm_bios_call *call)
629 {
630 return on_cpu0(__apm_bios_call, call);
631 }
632
633 /**
634 * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
635 * @_call: pointer to struct apm_bios_call.
636 *
637 * Make a BIOS call that returns one value only, or just status.
638 * If there is an error, then the error code is returned in AH
639 * (bits 8-15 of eax) and this function returns non-zero (it can
640 * also return -ENOMEM). This is used for simpler BIOS operations.
641 * This call may hold interrupts off for a long time on some laptops.
642 *
643 * Note: this makes the call on the current CPU.
644 */
645 static long __apm_bios_call_simple(void *_call)
646 {
647 u8 error;
648 APM_DECL_SEGS
649 unsigned long flags;
650 int cpu;
651 struct desc_struct save_desc_40;
652 struct desc_struct *gdt;
653 struct apm_bios_call *call = _call;
654
655 cpu = get_cpu();
656 BUG_ON(cpu != 0);
657 gdt = get_cpu_gdt_table(cpu);
658 save_desc_40 = gdt[0x40 / 8];
659 gdt[0x40 / 8] = bad_bios_desc;
660
661 apm_irq_save(flags);
662 APM_DO_SAVE_SEGS;
663 error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
664 &call->eax);
665 APM_DO_RESTORE_SEGS;
666 apm_irq_restore(flags);
667 gdt[0x40 / 8] = save_desc_40;
668 put_cpu();
669 return error;
670 }
671
672 /**
673 * apm_bios_call_simple - make a simple APM BIOS 32bit call
674 * @func: APM function to invoke
675 * @ebx_in: EBX register value for BIOS call
676 * @ecx_in: ECX register value for BIOS call
677 * @eax: EAX register on return from the BIOS call
678 * @err: bits
679 *
680 * Make a BIOS call that returns one value only, or just status.
681 * If there is an error, then the error code is returned in @err
682 * and this function returns non-zero. This is used for simpler
683 * BIOS operations. This call may hold interrupts off for a long
684 * time on some laptops.
685 */
686 static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
687 int *err)
688 {
689 struct apm_bios_call call;
690 int ret;
691
692 call.func = func;
693 call.ebx = ebx_in;
694 call.ecx = ecx_in;
695
696 ret = on_cpu0(__apm_bios_call_simple, &call);
697 *eax = call.eax;
698 *err = call.err;
699 return ret;
700 }
701
702 /**
703 * apm_driver_version - APM driver version
704 * @val: loaded with the APM version on return
705 *
706 * Retrieve the APM version supported by the BIOS. This is only
707 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
708 * probably present.
709 *
710 * On entry val should point to a value indicating the APM driver
711 * version with the high byte being the major and the low byte the
712 * minor number both in BCD
713 *
714 * On return it will hold the BIOS revision supported in the
715 * same format.
716 */
717
718 static int apm_driver_version(u_short *val)
719 {
720 u32 eax;
721 int err;
722
723 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
724 return err;
725 *val = eax;
726 return APM_SUCCESS;
727 }
728
729 /**
730 * apm_get_event - get an APM event from the BIOS
731 * @event: pointer to the event
732 * @info: point to the event information
733 *
734 * The APM BIOS provides a polled information for event
735 * reporting. The BIOS expects to be polled at least every second
736 * when events are pending. When a message is found the caller should
737 * poll until no more messages are present. However, this causes
738 * problems on some laptops where a suspend event notification is
739 * not cleared until it is acknowledged.
740 *
741 * Additional information is returned in the info pointer, providing
742 * that APM 1.2 is in use. If no messges are pending the value 0x80
743 * is returned (No power management events pending).
744 */
745 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
746 {
747 struct apm_bios_call call;
748
749 call.func = APM_FUNC_GET_EVENT;
750 call.ebx = call.ecx = 0;
751
752 if (apm_bios_call(&call))
753 return call.err;
754
755 *event = call.ebx;
756 if (apm_info.connection_version < 0x0102)
757 *info = ~0; /* indicate info not valid */
758 else
759 *info = call.ecx;
760 return APM_SUCCESS;
761 }
762
763 /**
764 * set_power_state - set the power management state
765 * @what: which items to transition
766 * @state: state to transition to
767 *
768 * Request an APM change of state for one or more system devices. The
769 * processor state must be transitioned last of all. what holds the
770 * class of device in the upper byte and the device number (0xFF for
771 * all) for the object to be transitioned.
772 *
773 * The state holds the state to transition to, which may in fact
774 * be an acceptance of a BIOS requested state change.
775 */
776
777 static int set_power_state(u_short what, u_short state)
778 {
779 u32 eax;
780 int err;
781
782 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
783 return err;
784 return APM_SUCCESS;
785 }
786
787 /**
788 * set_system_power_state - set system wide power state
789 * @state: which state to enter
790 *
791 * Transition the entire system into a new APM power state.
792 */
793
794 static int set_system_power_state(u_short state)
795 {
796 return set_power_state(APM_DEVICE_ALL, state);
797 }
798
799 /**
800 * apm_do_idle - perform power saving
801 *
802 * This function notifies the BIOS that the processor is (in the view
803 * of the OS) idle. It returns -1 in the event that the BIOS refuses
804 * to handle the idle request. On a success the function returns 1
805 * if the BIOS did clock slowing or 0 otherwise.
806 */
807
808 static int apm_do_idle(void)
809 {
810 u32 eax;
811 u8 ret = 0;
812 int idled = 0;
813 int polling;
814 int err;
815
816 polling = !!(current_thread_info()->status & TS_POLLING);
817 if (polling) {
818 current_thread_info()->status &= ~TS_POLLING;
819 /*
820 * TS_POLLING-cleared state must be visible before we
821 * test NEED_RESCHED:
822 */
823 smp_mb();
824 }
825 if (!need_resched()) {
826 idled = 1;
827 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
828 }
829 if (polling)
830 current_thread_info()->status |= TS_POLLING;
831
832 if (!idled)
833 return 0;
834
835 if (ret) {
836 static unsigned long t;
837
838 /* This always fails on some SMP boards running UP kernels.
839 * Only report the failure the first 5 times.
840 */
841 if (++t < 5) {
842 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
843 t = jiffies;
844 }
845 return -1;
846 }
847 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
848 return clock_slowed;
849 }
850
851 /**
852 * apm_do_busy - inform the BIOS the CPU is busy
853 *
854 * Request that the BIOS brings the CPU back to full performance.
855 */
856
857 static void apm_do_busy(void)
858 {
859 u32 dummy;
860 int err;
861
862 if (clock_slowed || ALWAYS_CALL_BUSY) {
863 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
864 clock_slowed = 0;
865 }
866 }
867
868 /*
869 * If no process has really been interested in
870 * the CPU for some time, we want to call BIOS
871 * power management - we probably want
872 * to conserve power.
873 */
874 #define IDLE_CALC_LIMIT (HZ * 100)
875 #define IDLE_LEAKY_MAX 16
876
877 static void (*original_pm_idle)(void) __read_mostly;
878
879 /**
880 * apm_cpu_idle - cpu idling for APM capable Linux
881 *
882 * This is the idling function the kernel executes when APM is available. It
883 * tries to do BIOS powermanagement based on the average system idle time.
884 * Furthermore it calls the system default idle routine.
885 */
886
887 static void apm_cpu_idle(void)
888 {
889 static int use_apm_idle; /* = 0 */
890 static unsigned int last_jiffies; /* = 0 */
891 static unsigned int last_stime; /* = 0 */
892
893 int apm_idle_done = 0;
894 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
895 unsigned int bucket;
896
897 recalc:
898 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
899 use_apm_idle = 0;
900 last_jiffies = jiffies;
901 last_stime = current->stime;
902 } else if (jiffies_since_last_check > idle_period) {
903 unsigned int idle_percentage;
904
905 idle_percentage = current->stime - last_stime;
906 idle_percentage *= 100;
907 idle_percentage /= jiffies_since_last_check;
908 use_apm_idle = (idle_percentage > idle_threshold);
909 if (apm_info.forbid_idle)
910 use_apm_idle = 0;
911 last_jiffies = jiffies;
912 last_stime = current->stime;
913 }
914
915 bucket = IDLE_LEAKY_MAX;
916
917 while (!need_resched()) {
918 if (use_apm_idle) {
919 unsigned int t;
920
921 t = jiffies;
922 switch (apm_do_idle()) {
923 case 0:
924 apm_idle_done = 1;
925 if (t != jiffies) {
926 if (bucket) {
927 bucket = IDLE_LEAKY_MAX;
928 continue;
929 }
930 } else if (bucket) {
931 bucket--;
932 continue;
933 }
934 break;
935 case 1:
936 apm_idle_done = 1;
937 break;
938 default: /* BIOS refused */
939 break;
940 }
941 }
942 if (original_pm_idle)
943 original_pm_idle();
944 else
945 default_idle();
946 local_irq_disable();
947 jiffies_since_last_check = jiffies - last_jiffies;
948 if (jiffies_since_last_check > idle_period)
949 goto recalc;
950 }
951
952 if (apm_idle_done)
953 apm_do_busy();
954
955 local_irq_enable();
956 }
957
958 /**
959 * apm_power_off - ask the BIOS to power off
960 *
961 * Handle the power off sequence. This is the one piece of code we
962 * will execute even on SMP machines. In order to deal with BIOS
963 * bugs we support real mode APM BIOS power off calls. We also make
964 * the SMP call on CPU0 as some systems will only honour this call
965 * on their first cpu.
966 */
967
968 static void apm_power_off(void)
969 {
970 unsigned char po_bios_call[] = {
971 0xb8, 0x00, 0x10, /* movw $0x1000,ax */
972 0x8e, 0xd0, /* movw ax,ss */
973 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
974 0xb8, 0x07, 0x53, /* movw $0x5307,ax */
975 0xbb, 0x01, 0x00, /* movw $0x0001,bx */
976 0xb9, 0x03, 0x00, /* movw $0x0003,cx */
977 0xcd, 0x15 /* int $0x15 */
978 };
979
980 /* Some bioses don't like being called from CPU != 0 */
981 if (apm_info.realmode_power_off) {
982 set_cpus_allowed_ptr(current, cpumask_of(0));
983 machine_real_restart(po_bios_call, sizeof(po_bios_call));
984 } else {
985 (void)set_system_power_state(APM_STATE_OFF);
986 }
987 }
988
989 #ifdef CONFIG_APM_DO_ENABLE
990
991 /**
992 * apm_enable_power_management - enable BIOS APM power management
993 * @enable: enable yes/no
994 *
995 * Enable or disable the APM BIOS power services.
996 */
997
998 static int apm_enable_power_management(int enable)
999 {
1000 u32 eax;
1001 int err;
1002
1003 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1004 return APM_NOT_ENGAGED;
1005 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1006 enable, &eax, &err))
1007 return err;
1008 if (enable)
1009 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1010 else
1011 apm_info.bios.flags |= APM_BIOS_DISABLED;
1012 return APM_SUCCESS;
1013 }
1014 #endif
1015
1016 /**
1017 * apm_get_power_status - get current power state
1018 * @status: returned status
1019 * @bat: battery info
1020 * @life: estimated life
1021 *
1022 * Obtain the current power status from the APM BIOS. We return a
1023 * status which gives the rough battery status, and current power
1024 * source. The bat value returned give an estimate as a percentage
1025 * of life and a status value for the battery. The estimated life
1026 * if reported is a lifetime in secodnds/minutes at current powwer
1027 * consumption.
1028 */
1029
1030 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1031 {
1032 struct apm_bios_call call;
1033
1034 call.func = APM_FUNC_GET_STATUS;
1035 call.ebx = APM_DEVICE_ALL;
1036 call.ecx = 0;
1037
1038 if (apm_info.get_power_status_broken)
1039 return APM_32_UNSUPPORTED;
1040 if (apm_bios_call(&call))
1041 return call.err;
1042 *status = call.ebx;
1043 *bat = call.ecx;
1044 if (apm_info.get_power_status_swabinminutes) {
1045 *life = swab16((u16)call.edx);
1046 *life |= 0x8000;
1047 } else
1048 *life = call.edx;
1049 return APM_SUCCESS;
1050 }
1051
1052 #if 0
1053 static int apm_get_battery_status(u_short which, u_short *status,
1054 u_short *bat, u_short *life, u_short *nbat)
1055 {
1056 u32 eax;
1057 u32 ebx;
1058 u32 ecx;
1059 u32 edx;
1060 u32 esi;
1061
1062 if (apm_info.connection_version < 0x0102) {
1063 /* pretend we only have one battery. */
1064 if (which != 1)
1065 return APM_BAD_DEVICE;
1066 *nbat = 1;
1067 return apm_get_power_status(status, bat, life);
1068 }
1069
1070 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1071 &ebx, &ecx, &edx, &esi))
1072 return (eax >> 8) & 0xff;
1073 *status = ebx;
1074 *bat = ecx;
1075 *life = edx;
1076 *nbat = esi;
1077 return APM_SUCCESS;
1078 }
1079 #endif
1080
1081 /**
1082 * apm_engage_power_management - enable PM on a device
1083 * @device: identity of device
1084 * @enable: on/off
1085 *
1086 * Activate or deactive power management on either a specific device
1087 * or the entire system (%APM_DEVICE_ALL).
1088 */
1089
1090 static int apm_engage_power_management(u_short device, int enable)
1091 {
1092 u32 eax;
1093 int err;
1094
1095 if ((enable == 0) && (device == APM_DEVICE_ALL)
1096 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1097 return APM_DISABLED;
1098 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1099 &eax, &err))
1100 return err;
1101 if (device == APM_DEVICE_ALL) {
1102 if (enable)
1103 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1104 else
1105 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1106 }
1107 return APM_SUCCESS;
1108 }
1109
1110 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1111
1112 /**
1113 * apm_console_blank - blank the display
1114 * @blank: on/off
1115 *
1116 * Attempt to blank the console, firstly by blanking just video device
1117 * zero, and if that fails (some BIOSes don't support it) then it blanks
1118 * all video devices. Typically the BIOS will do laptop backlight and
1119 * monitor powerdown for us.
1120 */
1121
1122 static int apm_console_blank(int blank)
1123 {
1124 int error = APM_NOT_ENGAGED; /* silence gcc */
1125 int i;
1126 u_short state;
1127 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1128
1129 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1130
1131 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1132 error = set_power_state(dev[i], state);
1133
1134 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1135 return 1;
1136
1137 if (error == APM_NOT_ENGAGED)
1138 break;
1139 }
1140
1141 if (error == APM_NOT_ENGAGED) {
1142 static int tried;
1143 int eng_error;
1144 if (tried++ == 0) {
1145 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1146 if (eng_error) {
1147 apm_error("set display", error);
1148 apm_error("engage interface", eng_error);
1149 return 0;
1150 } else
1151 return apm_console_blank(blank);
1152 }
1153 }
1154 apm_error("set display", error);
1155 return 0;
1156 }
1157 #endif
1158
1159 static int queue_empty(struct apm_user *as)
1160 {
1161 return as->event_head == as->event_tail;
1162 }
1163
1164 static apm_event_t get_queued_event(struct apm_user *as)
1165 {
1166 if (++as->event_tail >= APM_MAX_EVENTS)
1167 as->event_tail = 0;
1168 return as->events[as->event_tail];
1169 }
1170
1171 static void queue_event(apm_event_t event, struct apm_user *sender)
1172 {
1173 struct apm_user *as;
1174
1175 spin_lock(&user_list_lock);
1176 if (user_list == NULL)
1177 goto out;
1178 for (as = user_list; as != NULL; as = as->next) {
1179 if ((as == sender) || (!as->reader))
1180 continue;
1181 if (++as->event_head >= APM_MAX_EVENTS)
1182 as->event_head = 0;
1183
1184 if (as->event_head == as->event_tail) {
1185 static int notified;
1186
1187 if (notified++ == 0)
1188 printk(KERN_ERR "apm: an event queue overflowed\n");
1189 if (++as->event_tail >= APM_MAX_EVENTS)
1190 as->event_tail = 0;
1191 }
1192 as->events[as->event_head] = event;
1193 if (!as->suser || !as->writer)
1194 continue;
1195 switch (event) {
1196 case APM_SYS_SUSPEND:
1197 case APM_USER_SUSPEND:
1198 as->suspends_pending++;
1199 suspends_pending++;
1200 break;
1201
1202 case APM_SYS_STANDBY:
1203 case APM_USER_STANDBY:
1204 as->standbys_pending++;
1205 standbys_pending++;
1206 break;
1207 }
1208 }
1209 wake_up_interruptible(&apm_waitqueue);
1210 out:
1211 spin_unlock(&user_list_lock);
1212 }
1213
1214 static void reinit_timer(void)
1215 {
1216 #ifdef INIT_TIMER_AFTER_SUSPEND
1217 unsigned long flags;
1218
1219 spin_lock_irqsave(&i8253_lock, flags);
1220 /* set the clock to HZ */
1221 outb_pit(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1222 udelay(10);
1223 outb_pit(LATCH & 0xff, PIT_CH0); /* LSB */
1224 udelay(10);
1225 outb_pit(LATCH >> 8, PIT_CH0); /* MSB */
1226 udelay(10);
1227 spin_unlock_irqrestore(&i8253_lock, flags);
1228 #endif
1229 }
1230
1231 static int suspend(int vetoable)
1232 {
1233 int err;
1234 struct apm_user *as;
1235
1236 device_suspend(PMSG_SUSPEND);
1237 local_irq_disable();
1238 device_power_down(PMSG_SUSPEND);
1239 sysdev_suspend(PMSG_SUSPEND);
1240
1241 local_irq_enable();
1242
1243 save_processor_state();
1244 err = set_system_power_state(APM_STATE_SUSPEND);
1245 ignore_normal_resume = 1;
1246 restore_processor_state();
1247
1248 local_irq_disable();
1249 reinit_timer();
1250
1251 if (err == APM_NO_ERROR)
1252 err = APM_SUCCESS;
1253 if (err != APM_SUCCESS)
1254 apm_error("suspend", err);
1255 err = (err == APM_SUCCESS) ? 0 : -EIO;
1256 sysdev_resume();
1257 device_power_up(PMSG_RESUME);
1258 local_irq_enable();
1259 device_resume(PMSG_RESUME);
1260 queue_event(APM_NORMAL_RESUME, NULL);
1261 spin_lock(&user_list_lock);
1262 for (as = user_list; as != NULL; as = as->next) {
1263 as->suspend_wait = 0;
1264 as->suspend_result = err;
1265 }
1266 spin_unlock(&user_list_lock);
1267 wake_up_interruptible(&apm_suspend_waitqueue);
1268 return err;
1269 }
1270
1271 static void standby(void)
1272 {
1273 int err;
1274
1275 local_irq_disable();
1276 device_power_down(PMSG_SUSPEND);
1277 sysdev_suspend(PMSG_SUSPEND);
1278 local_irq_enable();
1279
1280 err = set_system_power_state(APM_STATE_STANDBY);
1281 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1282 apm_error("standby", err);
1283
1284 local_irq_disable();
1285 sysdev_resume();
1286 device_power_up(PMSG_RESUME);
1287 local_irq_enable();
1288 }
1289
1290 static apm_event_t get_event(void)
1291 {
1292 int error;
1293 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1294 apm_eventinfo_t info;
1295
1296 static int notified;
1297
1298 /* we don't use the eventinfo */
1299 error = apm_get_event(&event, &info);
1300 if (error == APM_SUCCESS)
1301 return event;
1302
1303 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1304 apm_error("get_event", error);
1305
1306 return 0;
1307 }
1308
1309 static void check_events(void)
1310 {
1311 apm_event_t event;
1312 static unsigned long last_resume;
1313 static int ignore_bounce;
1314
1315 while ((event = get_event()) != 0) {
1316 if (debug) {
1317 if (event <= NR_APM_EVENT_NAME)
1318 printk(KERN_DEBUG "apm: received %s notify\n",
1319 apm_event_name[event - 1]);
1320 else
1321 printk(KERN_DEBUG "apm: received unknown "
1322 "event 0x%02x\n", event);
1323 }
1324 if (ignore_bounce
1325 && (time_after(jiffies, last_resume + bounce_interval)))
1326 ignore_bounce = 0;
1327
1328 switch (event) {
1329 case APM_SYS_STANDBY:
1330 case APM_USER_STANDBY:
1331 queue_event(event, NULL);
1332 if (standbys_pending <= 0)
1333 standby();
1334 break;
1335
1336 case APM_USER_SUSPEND:
1337 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1338 if (apm_info.connection_version > 0x100)
1339 set_system_power_state(APM_STATE_REJECT);
1340 break;
1341 #endif
1342 case APM_SYS_SUSPEND:
1343 if (ignore_bounce) {
1344 if (apm_info.connection_version > 0x100)
1345 set_system_power_state(APM_STATE_REJECT);
1346 break;
1347 }
1348 /*
1349 * If we are already processing a SUSPEND,
1350 * then further SUSPEND events from the BIOS
1351 * will be ignored. We also return here to
1352 * cope with the fact that the Thinkpads keep
1353 * sending a SUSPEND event until something else
1354 * happens!
1355 */
1356 if (ignore_sys_suspend)
1357 return;
1358 ignore_sys_suspend = 1;
1359 queue_event(event, NULL);
1360 if (suspends_pending <= 0)
1361 (void) suspend(1);
1362 break;
1363
1364 case APM_NORMAL_RESUME:
1365 case APM_CRITICAL_RESUME:
1366 case APM_STANDBY_RESUME:
1367 ignore_sys_suspend = 0;
1368 last_resume = jiffies;
1369 ignore_bounce = 1;
1370 if ((event != APM_NORMAL_RESUME)
1371 || (ignore_normal_resume == 0)) {
1372 device_resume(PMSG_RESUME);
1373 queue_event(event, NULL);
1374 }
1375 ignore_normal_resume = 0;
1376 break;
1377
1378 case APM_CAPABILITY_CHANGE:
1379 case APM_LOW_BATTERY:
1380 case APM_POWER_STATUS_CHANGE:
1381 queue_event(event, NULL);
1382 /* If needed, notify drivers here */
1383 break;
1384
1385 case APM_UPDATE_TIME:
1386 break;
1387
1388 case APM_CRITICAL_SUSPEND:
1389 /*
1390 * We are not allowed to reject a critical suspend.
1391 */
1392 (void)suspend(0);
1393 break;
1394 }
1395 }
1396 }
1397
1398 static void apm_event_handler(void)
1399 {
1400 static int pending_count = 4;
1401 int err;
1402
1403 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1404 if ((apm_info.connection_version > 0x100) &&
1405 (pending_count-- <= 0)) {
1406 pending_count = 4;
1407 if (debug)
1408 printk(KERN_DEBUG "apm: setting state busy\n");
1409 err = set_system_power_state(APM_STATE_BUSY);
1410 if (err)
1411 apm_error("busy", err);
1412 }
1413 } else
1414 pending_count = 4;
1415 check_events();
1416 }
1417
1418 /*
1419 * This is the APM thread main loop.
1420 */
1421
1422 static void apm_mainloop(void)
1423 {
1424 DECLARE_WAITQUEUE(wait, current);
1425
1426 add_wait_queue(&apm_waitqueue, &wait);
1427 set_current_state(TASK_INTERRUPTIBLE);
1428 for (;;) {
1429 schedule_timeout(APM_CHECK_TIMEOUT);
1430 if (kthread_should_stop())
1431 break;
1432 /*
1433 * Ok, check all events, check for idle (and mark us sleeping
1434 * so as not to count towards the load average)..
1435 */
1436 set_current_state(TASK_INTERRUPTIBLE);
1437 apm_event_handler();
1438 }
1439 remove_wait_queue(&apm_waitqueue, &wait);
1440 }
1441
1442 static int check_apm_user(struct apm_user *as, const char *func)
1443 {
1444 if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1445 printk(KERN_ERR "apm: %s passed bad filp\n", func);
1446 return 1;
1447 }
1448 return 0;
1449 }
1450
1451 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1452 {
1453 struct apm_user *as;
1454 int i;
1455 apm_event_t event;
1456
1457 as = fp->private_data;
1458 if (check_apm_user(as, "read"))
1459 return -EIO;
1460 if ((int)count < sizeof(apm_event_t))
1461 return -EINVAL;
1462 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1463 return -EAGAIN;
1464 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1465 i = count;
1466 while ((i >= sizeof(event)) && !queue_empty(as)) {
1467 event = get_queued_event(as);
1468 if (copy_to_user(buf, &event, sizeof(event))) {
1469 if (i < count)
1470 break;
1471 return -EFAULT;
1472 }
1473 switch (event) {
1474 case APM_SYS_SUSPEND:
1475 case APM_USER_SUSPEND:
1476 as->suspends_read++;
1477 break;
1478
1479 case APM_SYS_STANDBY:
1480 case APM_USER_STANDBY:
1481 as->standbys_read++;
1482 break;
1483 }
1484 buf += sizeof(event);
1485 i -= sizeof(event);
1486 }
1487 if (i < count)
1488 return count - i;
1489 if (signal_pending(current))
1490 return -ERESTARTSYS;
1491 return 0;
1492 }
1493
1494 static unsigned int do_poll(struct file *fp, poll_table *wait)
1495 {
1496 struct apm_user *as;
1497
1498 as = fp->private_data;
1499 if (check_apm_user(as, "poll"))
1500 return 0;
1501 poll_wait(fp, &apm_waitqueue, wait);
1502 if (!queue_empty(as))
1503 return POLLIN | POLLRDNORM;
1504 return 0;
1505 }
1506
1507 static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1508 {
1509 struct apm_user *as;
1510 int ret;
1511
1512 as = filp->private_data;
1513 if (check_apm_user(as, "ioctl"))
1514 return -EIO;
1515 if (!as->suser || !as->writer)
1516 return -EPERM;
1517 switch (cmd) {
1518 case APM_IOC_STANDBY:
1519 lock_kernel();
1520 if (as->standbys_read > 0) {
1521 as->standbys_read--;
1522 as->standbys_pending--;
1523 standbys_pending--;
1524 } else
1525 queue_event(APM_USER_STANDBY, as);
1526 if (standbys_pending <= 0)
1527 standby();
1528 unlock_kernel();
1529 break;
1530 case APM_IOC_SUSPEND:
1531 lock_kernel();
1532 if (as->suspends_read > 0) {
1533 as->suspends_read--;
1534 as->suspends_pending--;
1535 suspends_pending--;
1536 } else
1537 queue_event(APM_USER_SUSPEND, as);
1538 if (suspends_pending <= 0) {
1539 ret = suspend(1);
1540 } else {
1541 as->suspend_wait = 1;
1542 wait_event_interruptible(apm_suspend_waitqueue,
1543 as->suspend_wait == 0);
1544 ret = as->suspend_result;
1545 }
1546 unlock_kernel();
1547 return ret;
1548 default:
1549 return -ENOTTY;
1550 }
1551 return 0;
1552 }
1553
1554 static int do_release(struct inode *inode, struct file *filp)
1555 {
1556 struct apm_user *as;
1557
1558 as = filp->private_data;
1559 if (check_apm_user(as, "release"))
1560 return 0;
1561 filp->private_data = NULL;
1562 if (as->standbys_pending > 0) {
1563 standbys_pending -= as->standbys_pending;
1564 if (standbys_pending <= 0)
1565 standby();
1566 }
1567 if (as->suspends_pending > 0) {
1568 suspends_pending -= as->suspends_pending;
1569 if (suspends_pending <= 0)
1570 (void) suspend(1);
1571 }
1572 spin_lock(&user_list_lock);
1573 if (user_list == as)
1574 user_list = as->next;
1575 else {
1576 struct apm_user *as1;
1577
1578 for (as1 = user_list;
1579 (as1 != NULL) && (as1->next != as);
1580 as1 = as1->next)
1581 ;
1582 if (as1 == NULL)
1583 printk(KERN_ERR "apm: filp not in user list\n");
1584 else
1585 as1->next = as->next;
1586 }
1587 spin_unlock(&user_list_lock);
1588 kfree(as);
1589 return 0;
1590 }
1591
1592 static int do_open(struct inode *inode, struct file *filp)
1593 {
1594 struct apm_user *as;
1595
1596 lock_kernel();
1597 as = kmalloc(sizeof(*as), GFP_KERNEL);
1598 if (as == NULL) {
1599 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1600 sizeof(*as));
1601 unlock_kernel();
1602 return -ENOMEM;
1603 }
1604 as->magic = APM_BIOS_MAGIC;
1605 as->event_tail = as->event_head = 0;
1606 as->suspends_pending = as->standbys_pending = 0;
1607 as->suspends_read = as->standbys_read = 0;
1608 /*
1609 * XXX - this is a tiny bit broken, when we consider BSD
1610 * process accounting. If the device is opened by root, we
1611 * instantly flag that we used superuser privs. Who knows,
1612 * we might close the device immediately without doing a
1613 * privileged operation -- cevans
1614 */
1615 as->suser = capable(CAP_SYS_ADMIN);
1616 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1617 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1618 spin_lock(&user_list_lock);
1619 as->next = user_list;
1620 user_list = as;
1621 spin_unlock(&user_list_lock);
1622 filp->private_data = as;
1623 unlock_kernel();
1624 return 0;
1625 }
1626
1627 static int proc_apm_show(struct seq_file *m, void *v)
1628 {
1629 unsigned short bx;
1630 unsigned short cx;
1631 unsigned short dx;
1632 int error;
1633 unsigned short ac_line_status = 0xff;
1634 unsigned short battery_status = 0xff;
1635 unsigned short battery_flag = 0xff;
1636 int percentage = -1;
1637 int time_units = -1;
1638 char *units = "?";
1639
1640 if ((num_online_cpus() == 1) &&
1641 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1642 ac_line_status = (bx >> 8) & 0xff;
1643 battery_status = bx & 0xff;
1644 if ((cx & 0xff) != 0xff)
1645 percentage = cx & 0xff;
1646
1647 if (apm_info.connection_version > 0x100) {
1648 battery_flag = (cx >> 8) & 0xff;
1649 if (dx != 0xffff) {
1650 units = (dx & 0x8000) ? "min" : "sec";
1651 time_units = dx & 0x7fff;
1652 }
1653 }
1654 }
1655 /* Arguments, with symbols from linux/apm_bios.h. Information is
1656 from the Get Power Status (0x0a) call unless otherwise noted.
1657
1658 0) Linux driver version (this will change if format changes)
1659 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1660 2) APM flags from APM Installation Check (0x00):
1661 bit 0: APM_16_BIT_SUPPORT
1662 bit 1: APM_32_BIT_SUPPORT
1663 bit 2: APM_IDLE_SLOWS_CLOCK
1664 bit 3: APM_BIOS_DISABLED
1665 bit 4: APM_BIOS_DISENGAGED
1666 3) AC line status
1667 0x00: Off-line
1668 0x01: On-line
1669 0x02: On backup power (BIOS >= 1.1 only)
1670 0xff: Unknown
1671 4) Battery status
1672 0x00: High
1673 0x01: Low
1674 0x02: Critical
1675 0x03: Charging
1676 0x04: Selected battery not present (BIOS >= 1.2 only)
1677 0xff: Unknown
1678 5) Battery flag
1679 bit 0: High
1680 bit 1: Low
1681 bit 2: Critical
1682 bit 3: Charging
1683 bit 7: No system battery
1684 0xff: Unknown
1685 6) Remaining battery life (percentage of charge):
1686 0-100: valid
1687 -1: Unknown
1688 7) Remaining battery life (time units):
1689 Number of remaining minutes or seconds
1690 -1: Unknown
1691 8) min = minutes; sec = seconds */
1692
1693 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1694 driver_version,
1695 (apm_info.bios.version >> 8) & 0xff,
1696 apm_info.bios.version & 0xff,
1697 apm_info.bios.flags,
1698 ac_line_status,
1699 battery_status,
1700 battery_flag,
1701 percentage,
1702 time_units,
1703 units);
1704 return 0;
1705 }
1706
1707 static int proc_apm_open(struct inode *inode, struct file *file)
1708 {
1709 return single_open(file, proc_apm_show, NULL);
1710 }
1711
1712 static const struct file_operations apm_file_ops = {
1713 .owner = THIS_MODULE,
1714 .open = proc_apm_open,
1715 .read = seq_read,
1716 .llseek = seq_lseek,
1717 .release = single_release,
1718 };
1719
1720 static int apm(void *unused)
1721 {
1722 unsigned short bx;
1723 unsigned short cx;
1724 unsigned short dx;
1725 int error;
1726 char *power_stat;
1727 char *bat_stat;
1728
1729 /* 2002/08/01 - WT
1730 * This is to avoid random crashes at boot time during initialization
1731 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1732 * Some bioses don't like being called from CPU != 0.
1733 * Method suggested by Ingo Molnar.
1734 */
1735 set_cpus_allowed_ptr(current, cpumask_of(0));
1736 BUG_ON(smp_processor_id() != 0);
1737
1738 if (apm_info.connection_version == 0) {
1739 apm_info.connection_version = apm_info.bios.version;
1740 if (apm_info.connection_version > 0x100) {
1741 /*
1742 * We only support BIOSs up to version 1.2
1743 */
1744 if (apm_info.connection_version > 0x0102)
1745 apm_info.connection_version = 0x0102;
1746 error = apm_driver_version(&apm_info.connection_version);
1747 if (error != APM_SUCCESS) {
1748 apm_error("driver version", error);
1749 /* Fall back to an APM 1.0 connection. */
1750 apm_info.connection_version = 0x100;
1751 }
1752 }
1753 }
1754
1755 if (debug)
1756 printk(KERN_INFO "apm: Connection version %d.%d\n",
1757 (apm_info.connection_version >> 8) & 0xff,
1758 apm_info.connection_version & 0xff);
1759
1760 #ifdef CONFIG_APM_DO_ENABLE
1761 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1762 /*
1763 * This call causes my NEC UltraLite Versa 33/C to hang if it
1764 * is booted with PM disabled but not in the docking station.
1765 * Unfortunate ...
1766 */
1767 error = apm_enable_power_management(1);
1768 if (error) {
1769 apm_error("enable power management", error);
1770 return -1;
1771 }
1772 }
1773 #endif
1774
1775 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1776 && (apm_info.connection_version > 0x0100)) {
1777 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1778 if (error) {
1779 apm_error("engage power management", error);
1780 return -1;
1781 }
1782 }
1783
1784 if (debug && (num_online_cpus() == 1 || smp)) {
1785 error = apm_get_power_status(&bx, &cx, &dx);
1786 if (error)
1787 printk(KERN_INFO "apm: power status not available\n");
1788 else {
1789 switch ((bx >> 8) & 0xff) {
1790 case 0:
1791 power_stat = "off line";
1792 break;
1793 case 1:
1794 power_stat = "on line";
1795 break;
1796 case 2:
1797 power_stat = "on backup power";
1798 break;
1799 default:
1800 power_stat = "unknown";
1801 break;
1802 }
1803 switch (bx & 0xff) {
1804 case 0:
1805 bat_stat = "high";
1806 break;
1807 case 1:
1808 bat_stat = "low";
1809 break;
1810 case 2:
1811 bat_stat = "critical";
1812 break;
1813 case 3:
1814 bat_stat = "charging";
1815 break;
1816 default:
1817 bat_stat = "unknown";
1818 break;
1819 }
1820 printk(KERN_INFO
1821 "apm: AC %s, battery status %s, battery life ",
1822 power_stat, bat_stat);
1823 if ((cx & 0xff) == 0xff)
1824 printk("unknown\n");
1825 else
1826 printk("%d%%\n", cx & 0xff);
1827 if (apm_info.connection_version > 0x100) {
1828 printk(KERN_INFO
1829 "apm: battery flag 0x%02x, battery life ",
1830 (cx >> 8) & 0xff);
1831 if (dx == 0xffff)
1832 printk("unknown\n");
1833 else
1834 printk("%d %s\n", dx & 0x7fff,
1835 (dx & 0x8000) ?
1836 "minutes" : "seconds");
1837 }
1838 }
1839 }
1840
1841 /* Install our power off handler.. */
1842 if (power_off)
1843 pm_power_off = apm_power_off;
1844
1845 if (num_online_cpus() == 1 || smp) {
1846 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1847 console_blank_hook = apm_console_blank;
1848 #endif
1849 apm_mainloop();
1850 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1851 console_blank_hook = NULL;
1852 #endif
1853 }
1854
1855 return 0;
1856 }
1857
1858 #ifndef MODULE
1859 static int __init apm_setup(char *str)
1860 {
1861 int invert;
1862
1863 while ((str != NULL) && (*str != '\0')) {
1864 if (strncmp(str, "off", 3) == 0)
1865 apm_disabled = 1;
1866 if (strncmp(str, "on", 2) == 0)
1867 apm_disabled = 0;
1868 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1869 (strncmp(str, "bounce_interval=", 16) == 0))
1870 bounce_interval = simple_strtol(str + 16, NULL, 0);
1871 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1872 (strncmp(str, "idle_threshold=", 15) == 0))
1873 idle_threshold = simple_strtol(str + 15, NULL, 0);
1874 if ((strncmp(str, "idle-period=", 12) == 0) ||
1875 (strncmp(str, "idle_period=", 12) == 0))
1876 idle_period = simple_strtol(str + 12, NULL, 0);
1877 invert = (strncmp(str, "no-", 3) == 0) ||
1878 (strncmp(str, "no_", 3) == 0);
1879 if (invert)
1880 str += 3;
1881 if (strncmp(str, "debug", 5) == 0)
1882 debug = !invert;
1883 if ((strncmp(str, "power-off", 9) == 0) ||
1884 (strncmp(str, "power_off", 9) == 0))
1885 power_off = !invert;
1886 if (strncmp(str, "smp", 3) == 0) {
1887 smp = !invert;
1888 idle_threshold = 100;
1889 }
1890 if ((strncmp(str, "allow-ints", 10) == 0) ||
1891 (strncmp(str, "allow_ints", 10) == 0))
1892 apm_info.allow_ints = !invert;
1893 if ((strncmp(str, "broken-psr", 10) == 0) ||
1894 (strncmp(str, "broken_psr", 10) == 0))
1895 apm_info.get_power_status_broken = !invert;
1896 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1897 (strncmp(str, "realmode_power_off", 18) == 0))
1898 apm_info.realmode_power_off = !invert;
1899 str = strchr(str, ',');
1900 if (str != NULL)
1901 str += strspn(str, ", \t");
1902 }
1903 return 1;
1904 }
1905
1906 __setup("apm=", apm_setup);
1907 #endif
1908
1909 static const struct file_operations apm_bios_fops = {
1910 .owner = THIS_MODULE,
1911 .read = do_read,
1912 .poll = do_poll,
1913 .unlocked_ioctl = do_ioctl,
1914 .open = do_open,
1915 .release = do_release,
1916 };
1917
1918 static struct miscdevice apm_device = {
1919 APM_MINOR_DEV,
1920 "apm_bios",
1921 &apm_bios_fops
1922 };
1923
1924
1925 /* Simple "print if true" callback */
1926 static int __init print_if_true(const struct dmi_system_id *d)
1927 {
1928 printk("%s\n", d->ident);
1929 return 0;
1930 }
1931
1932 /*
1933 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1934 * disabled before the suspend. Linux used to get terribly confused by that.
1935 */
1936 static int __init broken_ps2_resume(const struct dmi_system_id *d)
1937 {
1938 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1939 "workaround hopefully not needed.\n", d->ident);
1940 return 0;
1941 }
1942
1943 /* Some bioses have a broken protected mode poweroff and need to use realmode */
1944 static int __init set_realmode_power_off(const struct dmi_system_id *d)
1945 {
1946 if (apm_info.realmode_power_off == 0) {
1947 apm_info.realmode_power_off = 1;
1948 printk(KERN_INFO "%s bios detected. "
1949 "Using realmode poweroff only.\n", d->ident);
1950 }
1951 return 0;
1952 }
1953
1954 /* Some laptops require interrupts to be enabled during APM calls */
1955 static int __init set_apm_ints(const struct dmi_system_id *d)
1956 {
1957 if (apm_info.allow_ints == 0) {
1958 apm_info.allow_ints = 1;
1959 printk(KERN_INFO "%s machine detected. "
1960 "Enabling interrupts during APM calls.\n", d->ident);
1961 }
1962 return 0;
1963 }
1964
1965 /* Some APM bioses corrupt memory or just plain do not work */
1966 static int __init apm_is_horked(const struct dmi_system_id *d)
1967 {
1968 if (apm_info.disabled == 0) {
1969 apm_info.disabled = 1;
1970 printk(KERN_INFO "%s machine detected. "
1971 "Disabling APM.\n", d->ident);
1972 }
1973 return 0;
1974 }
1975
1976 static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1977 {
1978 if (apm_info.disabled == 0) {
1979 apm_info.disabled = 1;
1980 printk(KERN_INFO "%s machine detected. "
1981 "Disabling APM.\n", d->ident);
1982 printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n");
1983 printk(KERN_INFO "download from support.intel.com \n");
1984 }
1985 return 0;
1986 }
1987
1988 /* Some APM bioses hang on APM idle calls */
1989 static int __init apm_likes_to_melt(const struct dmi_system_id *d)
1990 {
1991 if (apm_info.forbid_idle == 0) {
1992 apm_info.forbid_idle = 1;
1993 printk(KERN_INFO "%s machine detected. "
1994 "Disabling APM idle calls.\n", d->ident);
1995 }
1996 return 0;
1997 }
1998
1999 /*
2000 * Check for clue free BIOS implementations who use
2001 * the following QA technique
2002 *
2003 * [ Write BIOS Code ]<------
2004 * | ^
2005 * < Does it Compile >----N--
2006 * |Y ^
2007 * < Does it Boot Win98 >-N--
2008 * |Y
2009 * [Ship It]
2010 *
2011 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
2012 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
2013 */
2014 static int __init broken_apm_power(const struct dmi_system_id *d)
2015 {
2016 apm_info.get_power_status_broken = 1;
2017 printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2018 "disabling power status reporting.\n");
2019 return 0;
2020 }
2021
2022 /*
2023 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2024 * have this problem).
2025 */
2026 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2027 {
2028 apm_info.get_power_status_swabinminutes = 1;
2029 printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2030 "in minutes and wrong byte order.\n");
2031 return 0;
2032 }
2033
2034 static struct dmi_system_id __initdata apm_dmi_table[] = {
2035 {
2036 print_if_true,
2037 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2038 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2039 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2040 },
2041 { /* Handle problems with APM on the C600 */
2042 broken_ps2_resume, "Dell Latitude C600",
2043 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2044 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2045 },
2046 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2047 set_apm_ints, "Dell Latitude",
2048 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2049 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2050 },
2051 { /* APM crashes */
2052 apm_is_horked, "Dell Inspiron 2500",
2053 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2054 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2055 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2056 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2057 },
2058 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2059 set_apm_ints, "Dell Inspiron", {
2060 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2061 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2062 },
2063 { /* Handle problems with APM on Inspiron 5000e */
2064 broken_apm_power, "Dell Inspiron 5000e",
2065 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2066 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2067 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2068 },
2069 { /* Handle problems with APM on Inspiron 2500 */
2070 broken_apm_power, "Dell Inspiron 2500",
2071 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2072 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2073 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2074 },
2075 { /* APM crashes */
2076 apm_is_horked, "Dell Dimension 4100",
2077 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2078 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2079 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2080 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2081 },
2082 { /* Allow interrupts during suspend on Compaq Laptops*/
2083 set_apm_ints, "Compaq 12XL125",
2084 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2085 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2086 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2087 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2088 },
2089 { /* Allow interrupts during APM or the clock goes slow */
2090 set_apm_ints, "ASUSTeK",
2091 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2092 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2093 },
2094 { /* APM blows on shutdown */
2095 apm_is_horked, "ABIT KX7-333[R]",
2096 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2097 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2098 },
2099 { /* APM crashes */
2100 apm_is_horked, "Trigem Delhi3",
2101 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2102 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2103 },
2104 { /* APM crashes */
2105 apm_is_horked, "Fujitsu-Siemens",
2106 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2107 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2108 },
2109 { /* APM crashes */
2110 apm_is_horked_d850md, "Intel D850MD",
2111 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2112 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2113 },
2114 { /* APM crashes */
2115 apm_is_horked, "Intel D810EMO",
2116 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2117 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2118 },
2119 { /* APM crashes */
2120 apm_is_horked, "Dell XPS-Z",
2121 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2122 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2123 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2124 },
2125 { /* APM crashes */
2126 apm_is_horked, "Sharp PC-PJ/AX",
2127 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2128 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2129 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2130 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2131 },
2132 { /* APM crashes */
2133 apm_is_horked, "Dell Inspiron 2500",
2134 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2135 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2136 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2137 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2138 },
2139 { /* APM idle hangs */
2140 apm_likes_to_melt, "Jabil AMD",
2141 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2142 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2143 },
2144 { /* APM idle hangs */
2145 apm_likes_to_melt, "AMI Bios",
2146 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2147 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2148 },
2149 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2150 swab_apm_power_in_minutes, "Sony VAIO",
2151 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2152 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2153 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2154 },
2155 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2156 swab_apm_power_in_minutes, "Sony VAIO",
2157 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2158 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2159 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2160 },
2161 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2162 swab_apm_power_in_minutes, "Sony VAIO",
2163 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2164 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2165 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2166 },
2167 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2168 swab_apm_power_in_minutes, "Sony VAIO",
2169 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2170 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2171 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2172 },
2173 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2174 swab_apm_power_in_minutes, "Sony VAIO",
2175 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2176 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2177 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2178 },
2179 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2180 swab_apm_power_in_minutes, "Sony VAIO",
2181 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2182 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2183 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2184 },
2185 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2186 swab_apm_power_in_minutes, "Sony VAIO",
2187 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2188 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2189 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2190 },
2191 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2192 swab_apm_power_in_minutes, "Sony VAIO",
2193 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2194 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2195 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2196 },
2197 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2198 swab_apm_power_in_minutes, "Sony VAIO",
2199 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2200 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2201 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2202 },
2203 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2204 swab_apm_power_in_minutes, "Sony VAIO",
2205 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2206 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2207 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2208 },
2209
2210 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2211 swab_apm_power_in_minutes, "Sony VAIO",
2212 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2213 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2214 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2215 },
2216 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2217 swab_apm_power_in_minutes, "Sony VAIO",
2218 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2219 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2220 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2221 },
2222 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2223 swab_apm_power_in_minutes, "Sony VAIO",
2224 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2225 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2226 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2227 },
2228 { /* broken PM poweroff bios */
2229 set_realmode_power_off, "Award Software v4.60 PGMA",
2230 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2231 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2232 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2233 },
2234
2235 /* Generic per vendor APM settings */
2236
2237 { /* Allow interrupts during suspend on IBM laptops */
2238 set_apm_ints, "IBM",
2239 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2240 },
2241
2242 { }
2243 };
2244
2245 /*
2246 * Just start the APM thread. We do NOT want to do APM BIOS
2247 * calls from anything but the APM thread, if for no other reason
2248 * than the fact that we don't trust the APM BIOS. This way,
2249 * most common APM BIOS problems that lead to protection errors
2250 * etc will have at least some level of being contained...
2251 *
2252 * In short, if something bad happens, at least we have a choice
2253 * of just killing the apm thread..
2254 */
2255 static int __init apm_init(void)
2256 {
2257 struct desc_struct *gdt;
2258 int err;
2259
2260 dmi_check_system(apm_dmi_table);
2261
2262 if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) {
2263 printk(KERN_INFO "apm: BIOS not found.\n");
2264 return -ENODEV;
2265 }
2266 printk(KERN_INFO
2267 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2268 ((apm_info.bios.version >> 8) & 0xff),
2269 (apm_info.bios.version & 0xff),
2270 apm_info.bios.flags,
2271 driver_version);
2272 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2273 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2274 return -ENODEV;
2275 }
2276
2277 if (allow_ints)
2278 apm_info.allow_ints = 1;
2279 if (broken_psr)
2280 apm_info.get_power_status_broken = 1;
2281 if (realmode_power_off)
2282 apm_info.realmode_power_off = 1;
2283 /* User can override, but default is to trust DMI */
2284 if (apm_disabled != -1)
2285 apm_info.disabled = apm_disabled;
2286
2287 /*
2288 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2289 * but is reportedly a 1.0 BIOS.
2290 */
2291 if (apm_info.bios.version == 0x001)
2292 apm_info.bios.version = 0x100;
2293
2294 /* BIOS < 1.2 doesn't set cseg_16_len */
2295 if (apm_info.bios.version < 0x102)
2296 apm_info.bios.cseg_16_len = 0; /* 64k */
2297
2298 if (debug) {
2299 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2300 apm_info.bios.cseg, apm_info.bios.offset,
2301 apm_info.bios.cseg_16, apm_info.bios.dseg);
2302 if (apm_info.bios.version > 0x100)
2303 printk(" cseg len %x, dseg len %x",
2304 apm_info.bios.cseg_len,
2305 apm_info.bios.dseg_len);
2306 if (apm_info.bios.version > 0x101)
2307 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2308 printk("\n");
2309 }
2310
2311 if (apm_info.disabled) {
2312 printk(KERN_NOTICE "apm: disabled on user request.\n");
2313 return -ENODEV;
2314 }
2315 if ((num_online_cpus() > 1) && !power_off && !smp) {
2316 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2317 apm_info.disabled = 1;
2318 return -ENODEV;
2319 }
2320 if (pm_flags & PM_ACPI) {
2321 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2322 apm_info.disabled = 1;
2323 return -ENODEV;
2324 }
2325 pm_flags |= PM_APM;
2326
2327 /*
2328 * Set up a segment that references the real mode segment 0x40
2329 * that extends up to the end of page zero (that we have reserved).
2330 * This is for buggy BIOS's that refer to (real mode) segment 0x40
2331 * even though they are called in protected mode.
2332 */
2333 set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
2334 _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
2335
2336 /*
2337 * Set up the long jump entry point to the APM BIOS, which is called
2338 * from inline assembly.
2339 */
2340 apm_bios_entry.offset = apm_info.bios.offset;
2341 apm_bios_entry.segment = APM_CS;
2342
2343 /*
2344 * The APM 1.1 BIOS is supposed to provide limit information that it
2345 * recognizes. Many machines do this correctly, but many others do
2346 * not restrict themselves to their claimed limit. When this happens,
2347 * they will cause a segmentation violation in the kernel at boot time.
2348 * Most BIOS's, however, will respect a 64k limit, so we use that.
2349 *
2350 * Note we only set APM segments on CPU zero, since we pin the APM
2351 * code to that CPU.
2352 */
2353 gdt = get_cpu_gdt_table(0);
2354 set_base(gdt[APM_CS >> 3],
2355 __va((unsigned long)apm_info.bios.cseg << 4));
2356 set_base(gdt[APM_CS_16 >> 3],
2357 __va((unsigned long)apm_info.bios.cseg_16 << 4));
2358 set_base(gdt[APM_DS >> 3],
2359 __va((unsigned long)apm_info.bios.dseg << 4));
2360
2361 proc_create("apm", 0, NULL, &apm_file_ops);
2362
2363 kapmd_task = kthread_create(apm, NULL, "kapmd");
2364 if (IS_ERR(kapmd_task)) {
2365 printk(KERN_ERR "apm: disabled - Unable to start kernel "
2366 "thread.\n");
2367 err = PTR_ERR(kapmd_task);
2368 kapmd_task = NULL;
2369 remove_proc_entry("apm", NULL);
2370 return err;
2371 }
2372 wake_up_process(kapmd_task);
2373
2374 if (num_online_cpus() > 1 && !smp) {
2375 printk(KERN_NOTICE
2376 "apm: disabled - APM is not SMP safe (power off active).\n");
2377 return 0;
2378 }
2379
2380 /*
2381 * Note we don't actually care if the misc_device cannot be registered.
2382 * this driver can do its job without it, even if userspace can't
2383 * control it. just log the error
2384 */
2385 if (misc_register(&apm_device))
2386 printk(KERN_WARNING "apm: Could not register misc device.\n");
2387
2388 if (HZ != 100)
2389 idle_period = (idle_period * HZ) / 100;
2390 if (idle_threshold < 100) {
2391 original_pm_idle = pm_idle;
2392 pm_idle = apm_cpu_idle;
2393 set_pm_idle = 1;
2394 }
2395
2396 return 0;
2397 }
2398
2399 static void __exit apm_exit(void)
2400 {
2401 int error;
2402
2403 if (set_pm_idle) {
2404 pm_idle = original_pm_idle;
2405 /*
2406 * We are about to unload the current idle thread pm callback
2407 * (pm_idle), Wait for all processors to update cached/local
2408 * copies of pm_idle before proceeding.
2409 */
2410 cpu_idle_wait();
2411 }
2412 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2413 && (apm_info.connection_version > 0x0100)) {
2414 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2415 if (error)
2416 apm_error("disengage power management", error);
2417 }
2418 misc_deregister(&apm_device);
2419 remove_proc_entry("apm", NULL);
2420 if (power_off)
2421 pm_power_off = NULL;
2422 if (kapmd_task) {
2423 kthread_stop(kapmd_task);
2424 kapmd_task = NULL;
2425 }
2426 pm_flags &= ~PM_APM;
2427 }
2428
2429 module_init(apm_init);
2430 module_exit(apm_exit);
2431
2432 MODULE_AUTHOR("Stephen Rothwell");
2433 MODULE_DESCRIPTION("Advanced Power Management");
2434 MODULE_LICENSE("GPL");
2435 module_param(debug, bool, 0644);
2436 MODULE_PARM_DESC(debug, "Enable debug mode");
2437 module_param(power_off, bool, 0444);
2438 MODULE_PARM_DESC(power_off, "Enable power off");
2439 module_param(bounce_interval, int, 0444);
2440 MODULE_PARM_DESC(bounce_interval,
2441 "Set the number of ticks to ignore suspend bounces");
2442 module_param(allow_ints, bool, 0444);
2443 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2444 module_param(broken_psr, bool, 0444);
2445 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2446 module_param(realmode_power_off, bool, 0444);
2447 MODULE_PARM_DESC(realmode_power_off,
2448 "Switch to real mode before powering off");
2449 module_param(idle_threshold, int, 0444);
2450 MODULE_PARM_DESC(idle_threshold,
2451 "System idle percentage above which to make APM BIOS idle calls");
2452 module_param(idle_period, int, 0444);
2453 MODULE_PARM_DESC(idle_period,
2454 "Period (in sec/100) over which to caculate the idle percentage");
2455 module_param(smp, bool, 0444);
2456 MODULE_PARM_DESC(smp,
2457 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2458 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
(Inofficial) Linux kernel tree running on the Nao robot