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Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / x86 / kernel / apm_32.c
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
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 DEFINE_MUTEX(apm_mutex);
407
408 /*
409 * Set up a segment that references the real mode segment 0x40
410 * that extends up to the end of page zero (that we have reserved).
411 * This is for buggy BIOS's that refer to (real mode) segment 0x40
412 * even though they are called in protected mode.
413 */
414 static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
415 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
416
417 static const char driver_version[] = "1.16ac"; /* no spaces */
418
419 static struct task_struct *kapmd_task;
420
421 /*
422 * APM event names taken from the APM 1.2 specification. These are
423 * the message codes that the BIOS uses to tell us about events
424 */
425 static const char * const apm_event_name[] = {
426 "system standby",
427 "system suspend",
428 "normal resume",
429 "critical resume",
430 "low battery",
431 "power status change",
432 "update time",
433 "critical suspend",
434 "user standby",
435 "user suspend",
436 "system standby resume",
437 "capabilities change"
438 };
439 #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
440
441 typedef struct lookup_t {
442 int key;
443 char *msg;
444 } lookup_t;
445
446 /*
447 * The BIOS returns a set of standard error codes in AX when the
448 * carry flag is set.
449 */
450
451 static const lookup_t error_table[] = {
452 /* N/A { APM_SUCCESS, "Operation succeeded" }, */
453 { APM_DISABLED, "Power management disabled" },
454 { APM_CONNECTED, "Real mode interface already connected" },
455 { APM_NOT_CONNECTED, "Interface not connected" },
456 { APM_16_CONNECTED, "16 bit interface already connected" },
457 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
458 { APM_32_CONNECTED, "32 bit interface already connected" },
459 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
460 { APM_BAD_DEVICE, "Unrecognized device ID" },
461 { APM_BAD_PARAM, "Parameter out of range" },
462 { APM_NOT_ENGAGED, "Interface not engaged" },
463 { APM_BAD_FUNCTION, "Function not supported" },
464 { APM_RESUME_DISABLED, "Resume timer disabled" },
465 { APM_BAD_STATE, "Unable to enter requested state" },
466 /* N/A { APM_NO_EVENTS, "No events pending" }, */
467 { APM_NO_ERROR, "BIOS did not set a return code" },
468 { APM_NOT_PRESENT, "No APM present" }
469 };
470 #define ERROR_COUNT ARRAY_SIZE(error_table)
471
472 /**
473 * apm_error - display an APM error
474 * @str: information string
475 * @err: APM BIOS return code
476 *
477 * Write a meaningful log entry to the kernel log in the event of
478 * an APM error. Note that this also handles (negative) kernel errors.
479 */
480
481 static void apm_error(char *str, int err)
482 {
483 int i;
484
485 for (i = 0; i < ERROR_COUNT; i++)
486 if (error_table[i].key == err)
487 break;
488 if (i < ERROR_COUNT)
489 printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
490 else if (err < 0)
491 printk(KERN_NOTICE "apm: %s: linux error code %i\n", str, err);
492 else
493 printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
494 str, err);
495 }
496
497 /*
498 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
499 * apm_info.allow_ints, we are being really paranoid here! Not only
500 * are interrupts disabled, but all the segment registers (except SS)
501 * are saved and zeroed this means that if the BIOS tries to reference
502 * any data without explicitly loading the segment registers, the kernel
503 * will fault immediately rather than have some unforeseen circumstances
504 * for the rest of the kernel. And it will be very obvious! :-) Doing
505 * this depends on CS referring to the same physical memory as DS so that
506 * DS can be zeroed before the call. Unfortunately, we can't do anything
507 * about the stack segment/pointer. Also, we tell the compiler that
508 * everything could change.
509 *
510 * Also, we KNOW that for the non error case of apm_bios_call, there
511 * is no useful data returned in the low order 8 bits of eax.
512 */
513
514 static inline unsigned long __apm_irq_save(void)
515 {
516 unsigned long flags;
517 local_save_flags(flags);
518 if (apm_info.allow_ints) {
519 if (irqs_disabled_flags(flags))
520 local_irq_enable();
521 } else
522 local_irq_disable();
523
524 return flags;
525 }
526
527 #define apm_irq_save(flags) \
528 do { flags = __apm_irq_save(); } while (0)
529
530 static inline void apm_irq_restore(unsigned long flags)
531 {
532 if (irqs_disabled_flags(flags))
533 local_irq_disable();
534 else if (irqs_disabled())
535 local_irq_enable();
536 }
537
538 #ifdef APM_ZERO_SEGS
539 # define APM_DECL_SEGS \
540 unsigned int saved_fs; unsigned int saved_gs;
541 # define APM_DO_SAVE_SEGS \
542 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
543 # define APM_DO_RESTORE_SEGS \
544 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
545 #else
546 # define APM_DECL_SEGS
547 # define APM_DO_SAVE_SEGS
548 # define APM_DO_RESTORE_SEGS
549 #endif
550
551 struct apm_bios_call {
552 u32 func;
553 /* In and out */
554 u32 ebx;
555 u32 ecx;
556 /* Out only */
557 u32 eax;
558 u32 edx;
559 u32 esi;
560
561 /* Error: -ENOMEM, or bits 8-15 of eax */
562 int err;
563 };
564
565 /**
566 * __apm_bios_call - Make an APM BIOS 32bit call
567 * @_call: pointer to struct apm_bios_call.
568 *
569 * Make an APM call using the 32bit protected mode interface. The
570 * caller is responsible for knowing if APM BIOS is configured and
571 * enabled. This call can disable interrupts for a long period of
572 * time on some laptops. The return value is in AH and the carry
573 * flag is loaded into AL. If there is an error, then the error
574 * code is returned in AH (bits 8-15 of eax) and this function
575 * returns non-zero.
576 *
577 * Note: this makes the call on the current CPU.
578 */
579 static long __apm_bios_call(void *_call)
580 {
581 APM_DECL_SEGS
582 unsigned long flags;
583 int cpu;
584 struct desc_struct save_desc_40;
585 struct desc_struct *gdt;
586 struct apm_bios_call *call = _call;
587
588 cpu = get_cpu();
589 BUG_ON(cpu != 0);
590 gdt = get_cpu_gdt_table(cpu);
591 save_desc_40 = gdt[0x40 / 8];
592 gdt[0x40 / 8] = bad_bios_desc;
593
594 apm_irq_save(flags);
595 APM_DO_SAVE_SEGS;
596 apm_bios_call_asm(call->func, call->ebx, call->ecx,
597 &call->eax, &call->ebx, &call->ecx, &call->edx,
598 &call->esi);
599 APM_DO_RESTORE_SEGS;
600 apm_irq_restore(flags);
601 gdt[0x40 / 8] = save_desc_40;
602 put_cpu();
603
604 return call->eax & 0xff;
605 }
606
607 /* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
608 static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
609 {
610 int ret;
611
612 /* Don't bother with work_on_cpu in the common case, so we don't
613 * have to worry about OOM or overhead. */
614 if (get_cpu() == 0) {
615 ret = fn(call);
616 put_cpu();
617 } else {
618 put_cpu();
619 ret = work_on_cpu(0, fn, call);
620 }
621
622 /* work_on_cpu can fail with -ENOMEM */
623 if (ret < 0)
624 call->err = ret;
625 else
626 call->err = (call->eax >> 8) & 0xff;
627
628 return ret;
629 }
630
631 /**
632 * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0)
633 * @call: the apm_bios_call registers.
634 *
635 * If there is an error, it is returned in @call.err.
636 */
637 static int apm_bios_call(struct apm_bios_call *call)
638 {
639 return on_cpu0(__apm_bios_call, call);
640 }
641
642 /**
643 * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
644 * @_call: pointer to struct apm_bios_call.
645 *
646 * Make a BIOS call that returns one value only, or just status.
647 * If there is an error, then the error code is returned in AH
648 * (bits 8-15 of eax) and this function returns non-zero (it can
649 * also return -ENOMEM). This is used for simpler BIOS operations.
650 * This call may hold interrupts off for a long time on some laptops.
651 *
652 * Note: this makes the call on the current CPU.
653 */
654 static long __apm_bios_call_simple(void *_call)
655 {
656 u8 error;
657 APM_DECL_SEGS
658 unsigned long flags;
659 int cpu;
660 struct desc_struct save_desc_40;
661 struct desc_struct *gdt;
662 struct apm_bios_call *call = _call;
663
664 cpu = get_cpu();
665 BUG_ON(cpu != 0);
666 gdt = get_cpu_gdt_table(cpu);
667 save_desc_40 = gdt[0x40 / 8];
668 gdt[0x40 / 8] = bad_bios_desc;
669
670 apm_irq_save(flags);
671 APM_DO_SAVE_SEGS;
672 error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
673 &call->eax);
674 APM_DO_RESTORE_SEGS;
675 apm_irq_restore(flags);
676 gdt[0x40 / 8] = save_desc_40;
677 put_cpu();
678 return error;
679 }
680
681 /**
682 * apm_bios_call_simple - make a simple APM BIOS 32bit call
683 * @func: APM function to invoke
684 * @ebx_in: EBX register value for BIOS call
685 * @ecx_in: ECX register value for BIOS call
686 * @eax: EAX register on return from the BIOS call
687 * @err: bits
688 *
689 * Make a BIOS call that returns one value only, or just status.
690 * If there is an error, then the error code is returned in @err
691 * and this function returns non-zero. This is used for simpler
692 * BIOS operations. This call may hold interrupts off for a long
693 * time on some laptops.
694 */
695 static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
696 int *err)
697 {
698 struct apm_bios_call call;
699 int ret;
700
701 call.func = func;
702 call.ebx = ebx_in;
703 call.ecx = ecx_in;
704
705 ret = on_cpu0(__apm_bios_call_simple, &call);
706 *eax = call.eax;
707 *err = call.err;
708 return ret;
709 }
710
711 /**
712 * apm_driver_version - APM driver version
713 * @val: loaded with the APM version on return
714 *
715 * Retrieve the APM version supported by the BIOS. This is only
716 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
717 * probably present.
718 *
719 * On entry val should point to a value indicating the APM driver
720 * version with the high byte being the major and the low byte the
721 * minor number both in BCD
722 *
723 * On return it will hold the BIOS revision supported in the
724 * same format.
725 */
726
727 static int apm_driver_version(u_short *val)
728 {
729 u32 eax;
730 int err;
731
732 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
733 return err;
734 *val = eax;
735 return APM_SUCCESS;
736 }
737
738 /**
739 * apm_get_event - get an APM event from the BIOS
740 * @event: pointer to the event
741 * @info: point to the event information
742 *
743 * The APM BIOS provides a polled information for event
744 * reporting. The BIOS expects to be polled at least every second
745 * when events are pending. When a message is found the caller should
746 * poll until no more messages are present. However, this causes
747 * problems on some laptops where a suspend event notification is
748 * not cleared until it is acknowledged.
749 *
750 * Additional information is returned in the info pointer, providing
751 * that APM 1.2 is in use. If no messges are pending the value 0x80
752 * is returned (No power management events pending).
753 */
754 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
755 {
756 struct apm_bios_call call;
757
758 call.func = APM_FUNC_GET_EVENT;
759 call.ebx = call.ecx = 0;
760
761 if (apm_bios_call(&call))
762 return call.err;
763
764 *event = call.ebx;
765 if (apm_info.connection_version < 0x0102)
766 *info = ~0; /* indicate info not valid */
767 else
768 *info = call.ecx;
769 return APM_SUCCESS;
770 }
771
772 /**
773 * set_power_state - set the power management state
774 * @what: which items to transition
775 * @state: state to transition to
776 *
777 * Request an APM change of state for one or more system devices. The
778 * processor state must be transitioned last of all. what holds the
779 * class of device in the upper byte and the device number (0xFF for
780 * all) for the object to be transitioned.
781 *
782 * The state holds the state to transition to, which may in fact
783 * be an acceptance of a BIOS requested state change.
784 */
785
786 static int set_power_state(u_short what, u_short state)
787 {
788 u32 eax;
789 int err;
790
791 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
792 return err;
793 return APM_SUCCESS;
794 }
795
796 /**
797 * set_system_power_state - set system wide power state
798 * @state: which state to enter
799 *
800 * Transition the entire system into a new APM power state.
801 */
802
803 static int set_system_power_state(u_short state)
804 {
805 return set_power_state(APM_DEVICE_ALL, state);
806 }
807
808 /**
809 * apm_do_idle - perform power saving
810 *
811 * This function notifies the BIOS that the processor is (in the view
812 * of the OS) idle. It returns -1 in the event that the BIOS refuses
813 * to handle the idle request. On a success the function returns 1
814 * if the BIOS did clock slowing or 0 otherwise.
815 */
816
817 static int apm_do_idle(void)
818 {
819 u32 eax;
820 u8 ret = 0;
821 int idled = 0;
822 int polling;
823 int err = 0;
824
825 polling = !!(current_thread_info()->status & TS_POLLING);
826 if (polling) {
827 current_thread_info()->status &= ~TS_POLLING;
828 /*
829 * TS_POLLING-cleared state must be visible before we
830 * test NEED_RESCHED:
831 */
832 smp_mb();
833 }
834 if (!need_resched()) {
835 idled = 1;
836 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
837 }
838 if (polling)
839 current_thread_info()->status |= TS_POLLING;
840
841 if (!idled)
842 return 0;
843
844 if (ret) {
845 static unsigned long t;
846
847 /* This always fails on some SMP boards running UP kernels.
848 * Only report the failure the first 5 times.
849 */
850 if (++t < 5) {
851 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
852 t = jiffies;
853 }
854 return -1;
855 }
856 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
857 return clock_slowed;
858 }
859
860 /**
861 * apm_do_busy - inform the BIOS the CPU is busy
862 *
863 * Request that the BIOS brings the CPU back to full performance.
864 */
865
866 static void apm_do_busy(void)
867 {
868 u32 dummy;
869 int err;
870
871 if (clock_slowed || ALWAYS_CALL_BUSY) {
872 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
873 clock_slowed = 0;
874 }
875 }
876
877 /*
878 * If no process has really been interested in
879 * the CPU for some time, we want to call BIOS
880 * power management - we probably want
881 * to conserve power.
882 */
883 #define IDLE_CALC_LIMIT (HZ * 100)
884 #define IDLE_LEAKY_MAX 16
885
886 static void (*original_pm_idle)(void) __read_mostly;
887
888 /**
889 * apm_cpu_idle - cpu idling for APM capable Linux
890 *
891 * This is the idling function the kernel executes when APM is available. It
892 * tries to do BIOS powermanagement based on the average system idle time.
893 * Furthermore it calls the system default idle routine.
894 */
895
896 static void apm_cpu_idle(void)
897 {
898 static int use_apm_idle; /* = 0 */
899 static unsigned int last_jiffies; /* = 0 */
900 static unsigned int last_stime; /* = 0 */
901
902 int apm_idle_done = 0;
903 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
904 unsigned int bucket;
905
906 recalc:
907 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
908 use_apm_idle = 0;
909 last_jiffies = jiffies;
910 last_stime = current->stime;
911 } else if (jiffies_since_last_check > idle_period) {
912 unsigned int idle_percentage;
913
914 idle_percentage = current->stime - last_stime;
915 idle_percentage *= 100;
916 idle_percentage /= jiffies_since_last_check;
917 use_apm_idle = (idle_percentage > idle_threshold);
918 if (apm_info.forbid_idle)
919 use_apm_idle = 0;
920 last_jiffies = jiffies;
921 last_stime = current->stime;
922 }
923
924 bucket = IDLE_LEAKY_MAX;
925
926 while (!need_resched()) {
927 if (use_apm_idle) {
928 unsigned int t;
929
930 t = jiffies;
931 switch (apm_do_idle()) {
932 case 0:
933 apm_idle_done = 1;
934 if (t != jiffies) {
935 if (bucket) {
936 bucket = IDLE_LEAKY_MAX;
937 continue;
938 }
939 } else if (bucket) {
940 bucket--;
941 continue;
942 }
943 break;
944 case 1:
945 apm_idle_done = 1;
946 break;
947 default: /* BIOS refused */
948 break;
949 }
950 }
951 if (original_pm_idle)
952 original_pm_idle();
953 else
954 default_idle();
955 local_irq_disable();
956 jiffies_since_last_check = jiffies - last_jiffies;
957 if (jiffies_since_last_check > idle_period)
958 goto recalc;
959 }
960
961 if (apm_idle_done)
962 apm_do_busy();
963
964 local_irq_enable();
965 }
966
967 /**
968 * apm_power_off - ask the BIOS to power off
969 *
970 * Handle the power off sequence. This is the one piece of code we
971 * will execute even on SMP machines. In order to deal with BIOS
972 * bugs we support real mode APM BIOS power off calls. We also make
973 * the SMP call on CPU0 as some systems will only honour this call
974 * on their first cpu.
975 */
976
977 static void apm_power_off(void)
978 {
979 /* Some bioses don't like being called from CPU != 0 */
980 if (apm_info.realmode_power_off) {
981 set_cpus_allowed_ptr(current, cpumask_of(0));
982 machine_real_restart(MRR_APM);
983 } else {
984 (void)set_system_power_state(APM_STATE_OFF);
985 }
986 }
987
988 #ifdef CONFIG_APM_DO_ENABLE
989
990 /**
991 * apm_enable_power_management - enable BIOS APM power management
992 * @enable: enable yes/no
993 *
994 * Enable or disable the APM BIOS power services.
995 */
996
997 static int apm_enable_power_management(int enable)
998 {
999 u32 eax;
1000 int err;
1001
1002 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1003 return APM_NOT_ENGAGED;
1004 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1005 enable, &eax, &err))
1006 return err;
1007 if (enable)
1008 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1009 else
1010 apm_info.bios.flags |= APM_BIOS_DISABLED;
1011 return APM_SUCCESS;
1012 }
1013 #endif
1014
1015 /**
1016 * apm_get_power_status - get current power state
1017 * @status: returned status
1018 * @bat: battery info
1019 * @life: estimated life
1020 *
1021 * Obtain the current power status from the APM BIOS. We return a
1022 * status which gives the rough battery status, and current power
1023 * source. The bat value returned give an estimate as a percentage
1024 * of life and a status value for the battery. The estimated life
1025 * if reported is a lifetime in secodnds/minutes at current powwer
1026 * consumption.
1027 */
1028
1029 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1030 {
1031 struct apm_bios_call call;
1032
1033 call.func = APM_FUNC_GET_STATUS;
1034 call.ebx = APM_DEVICE_ALL;
1035 call.ecx = 0;
1036
1037 if (apm_info.get_power_status_broken)
1038 return APM_32_UNSUPPORTED;
1039 if (apm_bios_call(&call))
1040 return call.err;
1041 *status = call.ebx;
1042 *bat = call.ecx;
1043 if (apm_info.get_power_status_swabinminutes) {
1044 *life = swab16((u16)call.edx);
1045 *life |= 0x8000;
1046 } else
1047 *life = call.edx;
1048 return APM_SUCCESS;
1049 }
1050
1051 #if 0
1052 static int apm_get_battery_status(u_short which, u_short *status,
1053 u_short *bat, u_short *life, u_short *nbat)
1054 {
1055 u32 eax;
1056 u32 ebx;
1057 u32 ecx;
1058 u32 edx;
1059 u32 esi;
1060
1061 if (apm_info.connection_version < 0x0102) {
1062 /* pretend we only have one battery. */
1063 if (which != 1)
1064 return APM_BAD_DEVICE;
1065 *nbat = 1;
1066 return apm_get_power_status(status, bat, life);
1067 }
1068
1069 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1070 &ebx, &ecx, &edx, &esi))
1071 return (eax >> 8) & 0xff;
1072 *status = ebx;
1073 *bat = ecx;
1074 *life = edx;
1075 *nbat = esi;
1076 return APM_SUCCESS;
1077 }
1078 #endif
1079
1080 /**
1081 * apm_engage_power_management - enable PM on a device
1082 * @device: identity of device
1083 * @enable: on/off
1084 *
1085 * Activate or deactive power management on either a specific device
1086 * or the entire system (%APM_DEVICE_ALL).
1087 */
1088
1089 static int apm_engage_power_management(u_short device, int enable)
1090 {
1091 u32 eax;
1092 int err;
1093
1094 if ((enable == 0) && (device == APM_DEVICE_ALL)
1095 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1096 return APM_DISABLED;
1097 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1098 &eax, &err))
1099 return err;
1100 if (device == APM_DEVICE_ALL) {
1101 if (enable)
1102 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1103 else
1104 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1105 }
1106 return APM_SUCCESS;
1107 }
1108
1109 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1110
1111 /**
1112 * apm_console_blank - blank the display
1113 * @blank: on/off
1114 *
1115 * Attempt to blank the console, firstly by blanking just video device
1116 * zero, and if that fails (some BIOSes don't support it) then it blanks
1117 * all video devices. Typically the BIOS will do laptop backlight and
1118 * monitor powerdown for us.
1119 */
1120
1121 static int apm_console_blank(int blank)
1122 {
1123 int error = APM_NOT_ENGAGED; /* silence gcc */
1124 int i;
1125 u_short state;
1126 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1127
1128 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1129
1130 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1131 error = set_power_state(dev[i], state);
1132
1133 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1134 return 1;
1135
1136 if (error == APM_NOT_ENGAGED)
1137 break;
1138 }
1139
1140 if (error == APM_NOT_ENGAGED) {
1141 static int tried;
1142 int eng_error;
1143 if (tried++ == 0) {
1144 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1145 if (eng_error) {
1146 apm_error("set display", error);
1147 apm_error("engage interface", eng_error);
1148 return 0;
1149 } else
1150 return apm_console_blank(blank);
1151 }
1152 }
1153 apm_error("set display", error);
1154 return 0;
1155 }
1156 #endif
1157
1158 static int queue_empty(struct apm_user *as)
1159 {
1160 return as->event_head == as->event_tail;
1161 }
1162
1163 static apm_event_t get_queued_event(struct apm_user *as)
1164 {
1165 if (++as->event_tail >= APM_MAX_EVENTS)
1166 as->event_tail = 0;
1167 return as->events[as->event_tail];
1168 }
1169
1170 static void queue_event(apm_event_t event, struct apm_user *sender)
1171 {
1172 struct apm_user *as;
1173
1174 spin_lock(&user_list_lock);
1175 if (user_list == NULL)
1176 goto out;
1177 for (as = user_list; as != NULL; as = as->next) {
1178 if ((as == sender) || (!as->reader))
1179 continue;
1180 if (++as->event_head >= APM_MAX_EVENTS)
1181 as->event_head = 0;
1182
1183 if (as->event_head == as->event_tail) {
1184 static int notified;
1185
1186 if (notified++ == 0)
1187 printk(KERN_ERR "apm: an event queue overflowed\n");
1188 if (++as->event_tail >= APM_MAX_EVENTS)
1189 as->event_tail = 0;
1190 }
1191 as->events[as->event_head] = event;
1192 if (!as->suser || !as->writer)
1193 continue;
1194 switch (event) {
1195 case APM_SYS_SUSPEND:
1196 case APM_USER_SUSPEND:
1197 as->suspends_pending++;
1198 suspends_pending++;
1199 break;
1200
1201 case APM_SYS_STANDBY:
1202 case APM_USER_STANDBY:
1203 as->standbys_pending++;
1204 standbys_pending++;
1205 break;
1206 }
1207 }
1208 wake_up_interruptible(&apm_waitqueue);
1209 out:
1210 spin_unlock(&user_list_lock);
1211 }
1212
1213 static void reinit_timer(void)
1214 {
1215 #ifdef INIT_TIMER_AFTER_SUSPEND
1216 unsigned long flags;
1217
1218 raw_spin_lock_irqsave(&i8253_lock, flags);
1219 /* set the clock to HZ */
1220 outb_pit(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1221 udelay(10);
1222 outb_pit(LATCH & 0xff, PIT_CH0); /* LSB */
1223 udelay(10);
1224 outb_pit(LATCH >> 8, PIT_CH0); /* MSB */
1225 udelay(10);
1226 raw_spin_unlock_irqrestore(&i8253_lock, flags);
1227 #endif
1228 }
1229
1230 static int suspend(int vetoable)
1231 {
1232 int err;
1233 struct apm_user *as;
1234
1235 dpm_suspend_start(PMSG_SUSPEND);
1236
1237 dpm_suspend_noirq(PMSG_SUSPEND);
1238
1239 local_irq_disable();
1240 sysdev_suspend(PMSG_SUSPEND);
1241
1242 local_irq_enable();
1243
1244 save_processor_state();
1245 err = set_system_power_state(APM_STATE_SUSPEND);
1246 ignore_normal_resume = 1;
1247 restore_processor_state();
1248
1249 local_irq_disable();
1250 reinit_timer();
1251
1252 if (err == APM_NO_ERROR)
1253 err = APM_SUCCESS;
1254 if (err != APM_SUCCESS)
1255 apm_error("suspend", err);
1256 err = (err == APM_SUCCESS) ? 0 : -EIO;
1257
1258 sysdev_resume();
1259 local_irq_enable();
1260
1261 dpm_resume_noirq(PMSG_RESUME);
1262
1263 dpm_resume_end(PMSG_RESUME);
1264 queue_event(APM_NORMAL_RESUME, NULL);
1265 spin_lock(&user_list_lock);
1266 for (as = user_list; as != NULL; as = as->next) {
1267 as->suspend_wait = 0;
1268 as->suspend_result = err;
1269 }
1270 spin_unlock(&user_list_lock);
1271 wake_up_interruptible(&apm_suspend_waitqueue);
1272 return err;
1273 }
1274
1275 static void standby(void)
1276 {
1277 int err;
1278
1279 dpm_suspend_noirq(PMSG_SUSPEND);
1280
1281 local_irq_disable();
1282 sysdev_suspend(PMSG_SUSPEND);
1283 local_irq_enable();
1284
1285 err = set_system_power_state(APM_STATE_STANDBY);
1286 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1287 apm_error("standby", err);
1288
1289 local_irq_disable();
1290 sysdev_resume();
1291 local_irq_enable();
1292
1293 dpm_resume_noirq(PMSG_RESUME);
1294 }
1295
1296 static apm_event_t get_event(void)
1297 {
1298 int error;
1299 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1300 apm_eventinfo_t info;
1301
1302 static int notified;
1303
1304 /* we don't use the eventinfo */
1305 error = apm_get_event(&event, &info);
1306 if (error == APM_SUCCESS)
1307 return event;
1308
1309 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1310 apm_error("get_event", error);
1311
1312 return 0;
1313 }
1314
1315 static void check_events(void)
1316 {
1317 apm_event_t event;
1318 static unsigned long last_resume;
1319 static int ignore_bounce;
1320
1321 while ((event = get_event()) != 0) {
1322 if (debug) {
1323 if (event <= NR_APM_EVENT_NAME)
1324 printk(KERN_DEBUG "apm: received %s notify\n",
1325 apm_event_name[event - 1]);
1326 else
1327 printk(KERN_DEBUG "apm: received unknown "
1328 "event 0x%02x\n", event);
1329 }
1330 if (ignore_bounce
1331 && (time_after(jiffies, last_resume + bounce_interval)))
1332 ignore_bounce = 0;
1333
1334 switch (event) {
1335 case APM_SYS_STANDBY:
1336 case APM_USER_STANDBY:
1337 queue_event(event, NULL);
1338 if (standbys_pending <= 0)
1339 standby();
1340 break;
1341
1342 case APM_USER_SUSPEND:
1343 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1344 if (apm_info.connection_version > 0x100)
1345 set_system_power_state(APM_STATE_REJECT);
1346 break;
1347 #endif
1348 case APM_SYS_SUSPEND:
1349 if (ignore_bounce) {
1350 if (apm_info.connection_version > 0x100)
1351 set_system_power_state(APM_STATE_REJECT);
1352 break;
1353 }
1354 /*
1355 * If we are already processing a SUSPEND,
1356 * then further SUSPEND events from the BIOS
1357 * will be ignored. We also return here to
1358 * cope with the fact that the Thinkpads keep
1359 * sending a SUSPEND event until something else
1360 * happens!
1361 */
1362 if (ignore_sys_suspend)
1363 return;
1364 ignore_sys_suspend = 1;
1365 queue_event(event, NULL);
1366 if (suspends_pending <= 0)
1367 (void) suspend(1);
1368 break;
1369
1370 case APM_NORMAL_RESUME:
1371 case APM_CRITICAL_RESUME:
1372 case APM_STANDBY_RESUME:
1373 ignore_sys_suspend = 0;
1374 last_resume = jiffies;
1375 ignore_bounce = 1;
1376 if ((event != APM_NORMAL_RESUME)
1377 || (ignore_normal_resume == 0)) {
1378 dpm_resume_end(PMSG_RESUME);
1379 queue_event(event, NULL);
1380 }
1381 ignore_normal_resume = 0;
1382 break;
1383
1384 case APM_CAPABILITY_CHANGE:
1385 case APM_LOW_BATTERY:
1386 case APM_POWER_STATUS_CHANGE:
1387 queue_event(event, NULL);
1388 /* If needed, notify drivers here */
1389 break;
1390
1391 case APM_UPDATE_TIME:
1392 break;
1393
1394 case APM_CRITICAL_SUSPEND:
1395 /*
1396 * We are not allowed to reject a critical suspend.
1397 */
1398 (void)suspend(0);
1399 break;
1400 }
1401 }
1402 }
1403
1404 static void apm_event_handler(void)
1405 {
1406 static int pending_count = 4;
1407 int err;
1408
1409 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1410 if ((apm_info.connection_version > 0x100) &&
1411 (pending_count-- <= 0)) {
1412 pending_count = 4;
1413 if (debug)
1414 printk(KERN_DEBUG "apm: setting state busy\n");
1415 err = set_system_power_state(APM_STATE_BUSY);
1416 if (err)
1417 apm_error("busy", err);
1418 }
1419 } else
1420 pending_count = 4;
1421 check_events();
1422 }
1423
1424 /*
1425 * This is the APM thread main loop.
1426 */
1427
1428 static void apm_mainloop(void)
1429 {
1430 DECLARE_WAITQUEUE(wait, current);
1431
1432 add_wait_queue(&apm_waitqueue, &wait);
1433 set_current_state(TASK_INTERRUPTIBLE);
1434 for (;;) {
1435 schedule_timeout(APM_CHECK_TIMEOUT);
1436 if (kthread_should_stop())
1437 break;
1438 /*
1439 * Ok, check all events, check for idle (and mark us sleeping
1440 * so as not to count towards the load average)..
1441 */
1442 set_current_state(TASK_INTERRUPTIBLE);
1443 apm_event_handler();
1444 }
1445 remove_wait_queue(&apm_waitqueue, &wait);
1446 }
1447
1448 static int check_apm_user(struct apm_user *as, const char *func)
1449 {
1450 if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1451 printk(KERN_ERR "apm: %s passed bad filp\n", func);
1452 return 1;
1453 }
1454 return 0;
1455 }
1456
1457 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1458 {
1459 struct apm_user *as;
1460 int i;
1461 apm_event_t event;
1462
1463 as = fp->private_data;
1464 if (check_apm_user(as, "read"))
1465 return -EIO;
1466 if ((int)count < sizeof(apm_event_t))
1467 return -EINVAL;
1468 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1469 return -EAGAIN;
1470 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1471 i = count;
1472 while ((i >= sizeof(event)) && !queue_empty(as)) {
1473 event = get_queued_event(as);
1474 if (copy_to_user(buf, &event, sizeof(event))) {
1475 if (i < count)
1476 break;
1477 return -EFAULT;
1478 }
1479 switch (event) {
1480 case APM_SYS_SUSPEND:
1481 case APM_USER_SUSPEND:
1482 as->suspends_read++;
1483 break;
1484
1485 case APM_SYS_STANDBY:
1486 case APM_USER_STANDBY:
1487 as->standbys_read++;
1488 break;
1489 }
1490 buf += sizeof(event);
1491 i -= sizeof(event);
1492 }
1493 if (i < count)
1494 return count - i;
1495 if (signal_pending(current))
1496 return -ERESTARTSYS;
1497 return 0;
1498 }
1499
1500 static unsigned int do_poll(struct file *fp, poll_table *wait)
1501 {
1502 struct apm_user *as;
1503
1504 as = fp->private_data;
1505 if (check_apm_user(as, "poll"))
1506 return 0;
1507 poll_wait(fp, &apm_waitqueue, wait);
1508 if (!queue_empty(as))
1509 return POLLIN | POLLRDNORM;
1510 return 0;
1511 }
1512
1513 static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1514 {
1515 struct apm_user *as;
1516 int ret;
1517
1518 as = filp->private_data;
1519 if (check_apm_user(as, "ioctl"))
1520 return -EIO;
1521 if (!as->suser || !as->writer)
1522 return -EPERM;
1523 switch (cmd) {
1524 case APM_IOC_STANDBY:
1525 mutex_lock(&apm_mutex);
1526 if (as->standbys_read > 0) {
1527 as->standbys_read--;
1528 as->standbys_pending--;
1529 standbys_pending--;
1530 } else
1531 queue_event(APM_USER_STANDBY, as);
1532 if (standbys_pending <= 0)
1533 standby();
1534 mutex_unlock(&apm_mutex);
1535 break;
1536 case APM_IOC_SUSPEND:
1537 mutex_lock(&apm_mutex);
1538 if (as->suspends_read > 0) {
1539 as->suspends_read--;
1540 as->suspends_pending--;
1541 suspends_pending--;
1542 } else
1543 queue_event(APM_USER_SUSPEND, as);
1544 if (suspends_pending <= 0) {
1545 ret = suspend(1);
1546 mutex_unlock(&apm_mutex);
1547 } else {
1548 as->suspend_wait = 1;
1549 mutex_unlock(&apm_mutex);
1550 wait_event_interruptible(apm_suspend_waitqueue,
1551 as->suspend_wait == 0);
1552 ret = as->suspend_result;
1553 }
1554 return ret;
1555 default:
1556 return -ENOTTY;
1557 }
1558 return 0;
1559 }
1560
1561 static int do_release(struct inode *inode, struct file *filp)
1562 {
1563 struct apm_user *as;
1564
1565 as = filp->private_data;
1566 if (check_apm_user(as, "release"))
1567 return 0;
1568 filp->private_data = NULL;
1569 if (as->standbys_pending > 0) {
1570 standbys_pending -= as->standbys_pending;
1571 if (standbys_pending <= 0)
1572 standby();
1573 }
1574 if (as->suspends_pending > 0) {
1575 suspends_pending -= as->suspends_pending;
1576 if (suspends_pending <= 0)
1577 (void) suspend(1);
1578 }
1579 spin_lock(&user_list_lock);
1580 if (user_list == as)
1581 user_list = as->next;
1582 else {
1583 struct apm_user *as1;
1584
1585 for (as1 = user_list;
1586 (as1 != NULL) && (as1->next != as);
1587 as1 = as1->next)
1588 ;
1589 if (as1 == NULL)
1590 printk(KERN_ERR "apm: filp not in user list\n");
1591 else
1592 as1->next = as->next;
1593 }
1594 spin_unlock(&user_list_lock);
1595 kfree(as);
1596 return 0;
1597 }
1598
1599 static int do_open(struct inode *inode, struct file *filp)
1600 {
1601 struct apm_user *as;
1602
1603 as = kmalloc(sizeof(*as), GFP_KERNEL);
1604 if (as == NULL) {
1605 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1606 sizeof(*as));
1607 return -ENOMEM;
1608 }
1609 as->magic = APM_BIOS_MAGIC;
1610 as->event_tail = as->event_head = 0;
1611 as->suspends_pending = as->standbys_pending = 0;
1612 as->suspends_read = as->standbys_read = 0;
1613 /*
1614 * XXX - this is a tiny bit broken, when we consider BSD
1615 * process accounting. If the device is opened by root, we
1616 * instantly flag that we used superuser privs. Who knows,
1617 * we might close the device immediately without doing a
1618 * privileged operation -- cevans
1619 */
1620 as->suser = capable(CAP_SYS_ADMIN);
1621 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1622 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1623 spin_lock(&user_list_lock);
1624 as->next = user_list;
1625 user_list = as;
1626 spin_unlock(&user_list_lock);
1627 filp->private_data = as;
1628 return 0;
1629 }
1630
1631 static int proc_apm_show(struct seq_file *m, void *v)
1632 {
1633 unsigned short bx;
1634 unsigned short cx;
1635 unsigned short dx;
1636 int error;
1637 unsigned short ac_line_status = 0xff;
1638 unsigned short battery_status = 0xff;
1639 unsigned short battery_flag = 0xff;
1640 int percentage = -1;
1641 int time_units = -1;
1642 char *units = "?";
1643
1644 if ((num_online_cpus() == 1) &&
1645 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1646 ac_line_status = (bx >> 8) & 0xff;
1647 battery_status = bx & 0xff;
1648 if ((cx & 0xff) != 0xff)
1649 percentage = cx & 0xff;
1650
1651 if (apm_info.connection_version > 0x100) {
1652 battery_flag = (cx >> 8) & 0xff;
1653 if (dx != 0xffff) {
1654 units = (dx & 0x8000) ? "min" : "sec";
1655 time_units = dx & 0x7fff;
1656 }
1657 }
1658 }
1659 /* Arguments, with symbols from linux/apm_bios.h. Information is
1660 from the Get Power Status (0x0a) call unless otherwise noted.
1661
1662 0) Linux driver version (this will change if format changes)
1663 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1664 2) APM flags from APM Installation Check (0x00):
1665 bit 0: APM_16_BIT_SUPPORT
1666 bit 1: APM_32_BIT_SUPPORT
1667 bit 2: APM_IDLE_SLOWS_CLOCK
1668 bit 3: APM_BIOS_DISABLED
1669 bit 4: APM_BIOS_DISENGAGED
1670 3) AC line status
1671 0x00: Off-line
1672 0x01: On-line
1673 0x02: On backup power (BIOS >= 1.1 only)
1674 0xff: Unknown
1675 4) Battery status
1676 0x00: High
1677 0x01: Low
1678 0x02: Critical
1679 0x03: Charging
1680 0x04: Selected battery not present (BIOS >= 1.2 only)
1681 0xff: Unknown
1682 5) Battery flag
1683 bit 0: High
1684 bit 1: Low
1685 bit 2: Critical
1686 bit 3: Charging
1687 bit 7: No system battery
1688 0xff: Unknown
1689 6) Remaining battery life (percentage of charge):
1690 0-100: valid
1691 -1: Unknown
1692 7) Remaining battery life (time units):
1693 Number of remaining minutes or seconds
1694 -1: Unknown
1695 8) min = minutes; sec = seconds */
1696
1697 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1698 driver_version,
1699 (apm_info.bios.version >> 8) & 0xff,
1700 apm_info.bios.version & 0xff,
1701 apm_info.bios.flags,
1702 ac_line_status,
1703 battery_status,
1704 battery_flag,
1705 percentage,
1706 time_units,
1707 units);
1708 return 0;
1709 }
1710
1711 static int proc_apm_open(struct inode *inode, struct file *file)
1712 {
1713 return single_open(file, proc_apm_show, NULL);
1714 }
1715
1716 static const struct file_operations apm_file_ops = {
1717 .owner = THIS_MODULE,
1718 .open = proc_apm_open,
1719 .read = seq_read,
1720 .llseek = seq_lseek,
1721 .release = single_release,
1722 };
1723
1724 static int apm(void *unused)
1725 {
1726 unsigned short bx;
1727 unsigned short cx;
1728 unsigned short dx;
1729 int error;
1730 char *power_stat;
1731 char *bat_stat;
1732
1733 /* 2002/08/01 - WT
1734 * This is to avoid random crashes at boot time during initialization
1735 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1736 * Some bioses don't like being called from CPU != 0.
1737 * Method suggested by Ingo Molnar.
1738 */
1739 set_cpus_allowed_ptr(current, cpumask_of(0));
1740 BUG_ON(smp_processor_id() != 0);
1741
1742 if (apm_info.connection_version == 0) {
1743 apm_info.connection_version = apm_info.bios.version;
1744 if (apm_info.connection_version > 0x100) {
1745 /*
1746 * We only support BIOSs up to version 1.2
1747 */
1748 if (apm_info.connection_version > 0x0102)
1749 apm_info.connection_version = 0x0102;
1750 error = apm_driver_version(&apm_info.connection_version);
1751 if (error != APM_SUCCESS) {
1752 apm_error("driver version", error);
1753 /* Fall back to an APM 1.0 connection. */
1754 apm_info.connection_version = 0x100;
1755 }
1756 }
1757 }
1758
1759 if (debug)
1760 printk(KERN_INFO "apm: Connection version %d.%d\n",
1761 (apm_info.connection_version >> 8) & 0xff,
1762 apm_info.connection_version & 0xff);
1763
1764 #ifdef CONFIG_APM_DO_ENABLE
1765 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1766 /*
1767 * This call causes my NEC UltraLite Versa 33/C to hang if it
1768 * is booted with PM disabled but not in the docking station.
1769 * Unfortunate ...
1770 */
1771 error = apm_enable_power_management(1);
1772 if (error) {
1773 apm_error("enable power management", error);
1774 return -1;
1775 }
1776 }
1777 #endif
1778
1779 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1780 && (apm_info.connection_version > 0x0100)) {
1781 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1782 if (error) {
1783 apm_error("engage power management", error);
1784 return -1;
1785 }
1786 }
1787
1788 if (debug && (num_online_cpus() == 1 || smp)) {
1789 error = apm_get_power_status(&bx, &cx, &dx);
1790 if (error)
1791 printk(KERN_INFO "apm: power status not available\n");
1792 else {
1793 switch ((bx >> 8) & 0xff) {
1794 case 0:
1795 power_stat = "off line";
1796 break;
1797 case 1:
1798 power_stat = "on line";
1799 break;
1800 case 2:
1801 power_stat = "on backup power";
1802 break;
1803 default:
1804 power_stat = "unknown";
1805 break;
1806 }
1807 switch (bx & 0xff) {
1808 case 0:
1809 bat_stat = "high";
1810 break;
1811 case 1:
1812 bat_stat = "low";
1813 break;
1814 case 2:
1815 bat_stat = "critical";
1816 break;
1817 case 3:
1818 bat_stat = "charging";
1819 break;
1820 default:
1821 bat_stat = "unknown";
1822 break;
1823 }
1824 printk(KERN_INFO
1825 "apm: AC %s, battery status %s, battery life ",
1826 power_stat, bat_stat);
1827 if ((cx & 0xff) == 0xff)
1828 printk("unknown\n");
1829 else
1830 printk("%d%%\n", cx & 0xff);
1831 if (apm_info.connection_version > 0x100) {
1832 printk(KERN_INFO
1833 "apm: battery flag 0x%02x, battery life ",
1834 (cx >> 8) & 0xff);
1835 if (dx == 0xffff)
1836 printk("unknown\n");
1837 else
1838 printk("%d %s\n", dx & 0x7fff,
1839 (dx & 0x8000) ?
1840 "minutes" : "seconds");
1841 }
1842 }
1843 }
1844
1845 /* Install our power off handler.. */
1846 if (power_off)
1847 pm_power_off = apm_power_off;
1848
1849 if (num_online_cpus() == 1 || smp) {
1850 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1851 console_blank_hook = apm_console_blank;
1852 #endif
1853 apm_mainloop();
1854 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1855 console_blank_hook = NULL;
1856 #endif
1857 }
1858
1859 return 0;
1860 }
1861
1862 #ifndef MODULE
1863 static int __init apm_setup(char *str)
1864 {
1865 int invert;
1866
1867 while ((str != NULL) && (*str != '\0')) {
1868 if (strncmp(str, "off", 3) == 0)
1869 apm_disabled = 1;
1870 if (strncmp(str, "on", 2) == 0)
1871 apm_disabled = 0;
1872 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1873 (strncmp(str, "bounce_interval=", 16) == 0))
1874 bounce_interval = simple_strtol(str + 16, NULL, 0);
1875 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1876 (strncmp(str, "idle_threshold=", 15) == 0))
1877 idle_threshold = simple_strtol(str + 15, NULL, 0);
1878 if ((strncmp(str, "idle-period=", 12) == 0) ||
1879 (strncmp(str, "idle_period=", 12) == 0))
1880 idle_period = simple_strtol(str + 12, NULL, 0);
1881 invert = (strncmp(str, "no-", 3) == 0) ||
1882 (strncmp(str, "no_", 3) == 0);
1883 if (invert)
1884 str += 3;
1885 if (strncmp(str, "debug", 5) == 0)
1886 debug = !invert;
1887 if ((strncmp(str, "power-off", 9) == 0) ||
1888 (strncmp(str, "power_off", 9) == 0))
1889 power_off = !invert;
1890 if (strncmp(str, "smp", 3) == 0) {
1891 smp = !invert;
1892 idle_threshold = 100;
1893 }
1894 if ((strncmp(str, "allow-ints", 10) == 0) ||
1895 (strncmp(str, "allow_ints", 10) == 0))
1896 apm_info.allow_ints = !invert;
1897 if ((strncmp(str, "broken-psr", 10) == 0) ||
1898 (strncmp(str, "broken_psr", 10) == 0))
1899 apm_info.get_power_status_broken = !invert;
1900 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1901 (strncmp(str, "realmode_power_off", 18) == 0))
1902 apm_info.realmode_power_off = !invert;
1903 str = strchr(str, ',');
1904 if (str != NULL)
1905 str += strspn(str, ", \t");
1906 }
1907 return 1;
1908 }
1909
1910 __setup("apm=", apm_setup);
1911 #endif
1912
1913 static const struct file_operations apm_bios_fops = {
1914 .owner = THIS_MODULE,
1915 .read = do_read,
1916 .poll = do_poll,
1917 .unlocked_ioctl = do_ioctl,
1918 .open = do_open,
1919 .release = do_release,
1920 .llseek = noop_llseek,
1921 };
1922
1923 static struct miscdevice apm_device = {
1924 APM_MINOR_DEV,
1925 "apm_bios",
1926 &apm_bios_fops
1927 };
1928
1929
1930 /* Simple "print if true" callback */
1931 static int __init print_if_true(const struct dmi_system_id *d)
1932 {
1933 printk("%s\n", d->ident);
1934 return 0;
1935 }
1936
1937 /*
1938 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1939 * disabled before the suspend. Linux used to get terribly confused by that.
1940 */
1941 static int __init broken_ps2_resume(const struct dmi_system_id *d)
1942 {
1943 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1944 "workaround hopefully not needed.\n", d->ident);
1945 return 0;
1946 }
1947
1948 /* Some bioses have a broken protected mode poweroff and need to use realmode */
1949 static int __init set_realmode_power_off(const struct dmi_system_id *d)
1950 {
1951 if (apm_info.realmode_power_off == 0) {
1952 apm_info.realmode_power_off = 1;
1953 printk(KERN_INFO "%s bios detected. "
1954 "Using realmode poweroff only.\n", d->ident);
1955 }
1956 return 0;
1957 }
1958
1959 /* Some laptops require interrupts to be enabled during APM calls */
1960 static int __init set_apm_ints(const struct dmi_system_id *d)
1961 {
1962 if (apm_info.allow_ints == 0) {
1963 apm_info.allow_ints = 1;
1964 printk(KERN_INFO "%s machine detected. "
1965 "Enabling interrupts during APM calls.\n", d->ident);
1966 }
1967 return 0;
1968 }
1969
1970 /* Some APM bioses corrupt memory or just plain do not work */
1971 static int __init apm_is_horked(const struct dmi_system_id *d)
1972 {
1973 if (apm_info.disabled == 0) {
1974 apm_info.disabled = 1;
1975 printk(KERN_INFO "%s machine detected. "
1976 "Disabling APM.\n", d->ident);
1977 }
1978 return 0;
1979 }
1980
1981 static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1982 {
1983 if (apm_info.disabled == 0) {
1984 apm_info.disabled = 1;
1985 printk(KERN_INFO "%s machine detected. "
1986 "Disabling APM.\n", d->ident);
1987 printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
1988 printk(KERN_INFO "download from support.intel.com\n");
1989 }
1990 return 0;
1991 }
1992
1993 /* Some APM bioses hang on APM idle calls */
1994 static int __init apm_likes_to_melt(const struct dmi_system_id *d)
1995 {
1996 if (apm_info.forbid_idle == 0) {
1997 apm_info.forbid_idle = 1;
1998 printk(KERN_INFO "%s machine detected. "
1999 "Disabling APM idle calls.\n", d->ident);
2000 }
2001 return 0;
2002 }
2003
2004 /*
2005 * Check for clue free BIOS implementations who use
2006 * the following QA technique
2007 *
2008 * [ Write BIOS Code ]<------
2009 * | ^
2010 * < Does it Compile >----N--
2011 * |Y ^
2012 * < Does it Boot Win98 >-N--
2013 * |Y
2014 * [Ship It]
2015 *
2016 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
2017 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
2018 */
2019 static int __init broken_apm_power(const struct dmi_system_id *d)
2020 {
2021 apm_info.get_power_status_broken = 1;
2022 printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2023 "disabling power status reporting.\n");
2024 return 0;
2025 }
2026
2027 /*
2028 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2029 * have this problem).
2030 */
2031 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2032 {
2033 apm_info.get_power_status_swabinminutes = 1;
2034 printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2035 "in minutes and wrong byte order.\n");
2036 return 0;
2037 }
2038
2039 static struct dmi_system_id __initdata apm_dmi_table[] = {
2040 {
2041 print_if_true,
2042 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2043 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2044 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2045 },
2046 { /* Handle problems with APM on the C600 */
2047 broken_ps2_resume, "Dell Latitude C600",
2048 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2049 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2050 },
2051 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2052 set_apm_ints, "Dell Latitude",
2053 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2054 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2055 },
2056 { /* APM crashes */
2057 apm_is_horked, "Dell Inspiron 2500",
2058 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2059 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2060 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2061 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2062 },
2063 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2064 set_apm_ints, "Dell Inspiron", {
2065 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2066 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2067 },
2068 { /* Handle problems with APM on Inspiron 5000e */
2069 broken_apm_power, "Dell Inspiron 5000e",
2070 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2071 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2072 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2073 },
2074 { /* Handle problems with APM on Inspiron 2500 */
2075 broken_apm_power, "Dell Inspiron 2500",
2076 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2077 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2078 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2079 },
2080 { /* APM crashes */
2081 apm_is_horked, "Dell Dimension 4100",
2082 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2083 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2084 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2085 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2086 },
2087 { /* Allow interrupts during suspend on Compaq Laptops*/
2088 set_apm_ints, "Compaq 12XL125",
2089 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2090 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2091 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2092 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2093 },
2094 { /* Allow interrupts during APM or the clock goes slow */
2095 set_apm_ints, "ASUSTeK",
2096 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2097 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2098 },
2099 { /* APM blows on shutdown */
2100 apm_is_horked, "ABIT KX7-333[R]",
2101 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2102 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2103 },
2104 { /* APM crashes */
2105 apm_is_horked, "Trigem Delhi3",
2106 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2107 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2108 },
2109 { /* APM crashes */
2110 apm_is_horked, "Fujitsu-Siemens",
2111 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2112 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2113 },
2114 { /* APM crashes */
2115 apm_is_horked_d850md, "Intel D850MD",
2116 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2117 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2118 },
2119 { /* APM crashes */
2120 apm_is_horked, "Intel D810EMO",
2121 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2122 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2123 },
2124 { /* APM crashes */
2125 apm_is_horked, "Dell XPS-Z",
2126 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2127 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2128 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2129 },
2130 { /* APM crashes */
2131 apm_is_horked, "Sharp PC-PJ/AX",
2132 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2133 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2134 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2135 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2136 },
2137 { /* APM crashes */
2138 apm_is_horked, "Dell Inspiron 2500",
2139 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2140 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2141 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2142 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2143 },
2144 { /* APM idle hangs */
2145 apm_likes_to_melt, "Jabil AMD",
2146 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2147 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2148 },
2149 { /* APM idle hangs */
2150 apm_likes_to_melt, "AMI Bios",
2151 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2152 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2153 },
2154 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2155 swab_apm_power_in_minutes, "Sony VAIO",
2156 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2157 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2158 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2159 },
2160 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2161 swab_apm_power_in_minutes, "Sony VAIO",
2162 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2163 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2164 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2165 },
2166 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2167 swab_apm_power_in_minutes, "Sony VAIO",
2168 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2169 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2170 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2171 },
2172 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2173 swab_apm_power_in_minutes, "Sony VAIO",
2174 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2175 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2176 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2177 },
2178 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2179 swab_apm_power_in_minutes, "Sony VAIO",
2180 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2181 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2182 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2183 },
2184 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2185 swab_apm_power_in_minutes, "Sony VAIO",
2186 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2187 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2188 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2189 },
2190 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2191 swab_apm_power_in_minutes, "Sony VAIO",
2192 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2193 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2194 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2195 },
2196 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2197 swab_apm_power_in_minutes, "Sony VAIO",
2198 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2199 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2200 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2201 },
2202 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2203 swab_apm_power_in_minutes, "Sony VAIO",
2204 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2205 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2206 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2207 },
2208 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2209 swab_apm_power_in_minutes, "Sony VAIO",
2210 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2211 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2212 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2213 },
2214
2215 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2216 swab_apm_power_in_minutes, "Sony VAIO",
2217 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2218 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2219 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2220 },
2221 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2222 swab_apm_power_in_minutes, "Sony VAIO",
2223 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2224 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2225 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2226 },
2227 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2228 swab_apm_power_in_minutes, "Sony VAIO",
2229 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2230 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2231 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2232 },
2233 { /* broken PM poweroff bios */
2234 set_realmode_power_off, "Award Software v4.60 PGMA",
2235 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2236 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2237 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2238 },
2239
2240 /* Generic per vendor APM settings */
2241
2242 { /* Allow interrupts during suspend on IBM laptops */
2243 set_apm_ints, "IBM",
2244 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2245 },
2246
2247 { }
2248 };
2249
2250 /*
2251 * Just start the APM thread. We do NOT want to do APM BIOS
2252 * calls from anything but the APM thread, if for no other reason
2253 * than the fact that we don't trust the APM BIOS. This way,
2254 * most common APM BIOS problems that lead to protection errors
2255 * etc will have at least some level of being contained...
2256 *
2257 * In short, if something bad happens, at least we have a choice
2258 * of just killing the apm thread..
2259 */
2260 static int __init apm_init(void)
2261 {
2262 struct desc_struct *gdt;
2263 int err;
2264
2265 dmi_check_system(apm_dmi_table);
2266
2267 if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) {
2268 printk(KERN_INFO "apm: BIOS not found.\n");
2269 return -ENODEV;
2270 }
2271 printk(KERN_INFO
2272 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2273 ((apm_info.bios.version >> 8) & 0xff),
2274 (apm_info.bios.version & 0xff),
2275 apm_info.bios.flags,
2276 driver_version);
2277 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2278 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2279 return -ENODEV;
2280 }
2281
2282 if (allow_ints)
2283 apm_info.allow_ints = 1;
2284 if (broken_psr)
2285 apm_info.get_power_status_broken = 1;
2286 if (realmode_power_off)
2287 apm_info.realmode_power_off = 1;
2288 /* User can override, but default is to trust DMI */
2289 if (apm_disabled != -1)
2290 apm_info.disabled = apm_disabled;
2291
2292 /*
2293 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2294 * but is reportedly a 1.0 BIOS.
2295 */
2296 if (apm_info.bios.version == 0x001)
2297 apm_info.bios.version = 0x100;
2298
2299 /* BIOS < 1.2 doesn't set cseg_16_len */
2300 if (apm_info.bios.version < 0x102)
2301 apm_info.bios.cseg_16_len = 0; /* 64k */
2302
2303 if (debug) {
2304 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2305 apm_info.bios.cseg, apm_info.bios.offset,
2306 apm_info.bios.cseg_16, apm_info.bios.dseg);
2307 if (apm_info.bios.version > 0x100)
2308 printk(" cseg len %x, dseg len %x",
2309 apm_info.bios.cseg_len,
2310 apm_info.bios.dseg_len);
2311 if (apm_info.bios.version > 0x101)
2312 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2313 printk("\n");
2314 }
2315
2316 if (apm_info.disabled) {
2317 printk(KERN_NOTICE "apm: disabled on user request.\n");
2318 return -ENODEV;
2319 }
2320 if ((num_online_cpus() > 1) && !power_off && !smp) {
2321 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2322 apm_info.disabled = 1;
2323 return -ENODEV;
2324 }
2325 if (!acpi_disabled) {
2326 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2327 apm_info.disabled = 1;
2328 return -ENODEV;
2329 }
2330
2331 /*
2332 * Set up the long jump entry point to the APM BIOS, which is called
2333 * from inline assembly.
2334 */
2335 apm_bios_entry.offset = apm_info.bios.offset;
2336 apm_bios_entry.segment = APM_CS;
2337
2338 /*
2339 * The APM 1.1 BIOS is supposed to provide limit information that it
2340 * recognizes. Many machines do this correctly, but many others do
2341 * not restrict themselves to their claimed limit. When this happens,
2342 * they will cause a segmentation violation in the kernel at boot time.
2343 * Most BIOS's, however, will respect a 64k limit, so we use that.
2344 *
2345 * Note we only set APM segments on CPU zero, since we pin the APM
2346 * code to that CPU.
2347 */
2348 gdt = get_cpu_gdt_table(0);
2349 set_desc_base(&gdt[APM_CS >> 3],
2350 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2351 set_desc_base(&gdt[APM_CS_16 >> 3],
2352 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2353 set_desc_base(&gdt[APM_DS >> 3],
2354 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2355
2356 proc_create("apm", 0, NULL, &apm_file_ops);
2357
2358 kapmd_task = kthread_create(apm, NULL, "kapmd");
2359 if (IS_ERR(kapmd_task)) {
2360 printk(KERN_ERR "apm: disabled - Unable to start kernel "
2361 "thread.\n");
2362 err = PTR_ERR(kapmd_task);
2363 kapmd_task = NULL;
2364 remove_proc_entry("apm", NULL);
2365 return err;
2366 }
2367 wake_up_process(kapmd_task);
2368
2369 if (num_online_cpus() > 1 && !smp) {
2370 printk(KERN_NOTICE
2371 "apm: disabled - APM is not SMP safe (power off active).\n");
2372 return 0;
2373 }
2374
2375 /*
2376 * Note we don't actually care if the misc_device cannot be registered.
2377 * this driver can do its job without it, even if userspace can't
2378 * control it. just log the error
2379 */
2380 if (misc_register(&apm_device))
2381 printk(KERN_WARNING "apm: Could not register misc device.\n");
2382
2383 if (HZ != 100)
2384 idle_period = (idle_period * HZ) / 100;
2385 if (idle_threshold < 100) {
2386 original_pm_idle = pm_idle;
2387 pm_idle = apm_cpu_idle;
2388 set_pm_idle = 1;
2389 }
2390
2391 return 0;
2392 }
2393
2394 static void __exit apm_exit(void)
2395 {
2396 int error;
2397
2398 if (set_pm_idle) {
2399 pm_idle = original_pm_idle;
2400 /*
2401 * We are about to unload the current idle thread pm callback
2402 * (pm_idle), Wait for all processors to update cached/local
2403 * copies of pm_idle before proceeding.
2404 */
2405 cpu_idle_wait();
2406 }
2407 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2408 && (apm_info.connection_version > 0x0100)) {
2409 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2410 if (error)
2411 apm_error("disengage power management", error);
2412 }
2413 misc_deregister(&apm_device);
2414 remove_proc_entry("apm", NULL);
2415 if (power_off)
2416 pm_power_off = NULL;
2417 if (kapmd_task) {
2418 kthread_stop(kapmd_task);
2419 kapmd_task = NULL;
2420 }
2421 }
2422
2423 module_init(apm_init);
2424 module_exit(apm_exit);
2425
2426 MODULE_AUTHOR("Stephen Rothwell");
2427 MODULE_DESCRIPTION("Advanced Power Management");
2428 MODULE_LICENSE("GPL");
2429 module_param(debug, bool, 0644);
2430 MODULE_PARM_DESC(debug, "Enable debug mode");
2431 module_param(power_off, bool, 0444);
2432 MODULE_PARM_DESC(power_off, "Enable power off");
2433 module_param(bounce_interval, int, 0444);
2434 MODULE_PARM_DESC(bounce_interval,
2435 "Set the number of ticks to ignore suspend bounces");
2436 module_param(allow_ints, bool, 0444);
2437 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2438 module_param(broken_psr, bool, 0444);
2439 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2440 module_param(realmode_power_off, bool, 0444);
2441 MODULE_PARM_DESC(realmode_power_off,
2442 "Switch to real mode before powering off");
2443 module_param(idle_threshold, int, 0444);
2444 MODULE_PARM_DESC(idle_threshold,
2445 "System idle percentage above which to make APM BIOS idle calls");
2446 module_param(idle_period, int, 0444);
2447 MODULE_PARM_DESC(idle_period,
2448 "Period (in sec/100) over which to caculate the idle percentage");
2449 module_param(smp, bool, 0444);
2450 MODULE_PARM_DESC(smp,
2451 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2452 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
kernel source for telekom puls (alcatel/mediatek)