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Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/agpgart
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / i386 / kernel / apm.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 replacment for it is, but Linux doesn't yet support this.
61 * Alan Cox Linux 2.1.55
62 * 1.3: Set up a valid data descriptor 0x40 for buggy BIOS's
63 * 1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by
64 * Dean Gaudet <dgaudet@arctic.org>.
65 * C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87
66 * 1.5: Fix segment register reloading (in case of bad segments saved
67 * across BIOS call).
68 * Stephen Rothwell
69 * 1.6: Cope with complier/assembler differences.
70 * Only try to turn off the first display device.
71 * Fix OOPS at power off with no APM BIOS by Jan Echternach
72 * <echter@informatik.uni-rostock.de>
73 * Stephen Rothwell
74 * 1.7: Modify driver's cached copy of the disabled/disengaged flags
75 * to reflect current state of APM BIOS.
76 * Chris Rankin <rankinc@bellsouth.net>
77 * Reset interrupt 0 timer to 100Hz after suspend
78 * Chad Miller <cmiller@surfsouth.com>
79 * Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
80 * Richard Gooch <rgooch@atnf.csiro.au>
81 * Allow boot time disabling of APM
82 * Make boot messages far less verbose by default
83 * Make asm safer
84 * Stephen Rothwell
85 * 1.8: Add CONFIG_APM_RTC_IS_GMT
86 * Richard Gooch <rgooch@atnf.csiro.au>
87 * change APM_NOINTS to CONFIG_APM_ALLOW_INTS
88 * remove dependency on CONFIG_PROC_FS
89 * Stephen Rothwell
90 * 1.9: Fix small typo. <laslo@wodip.opole.pl>
91 * Try to cope with BIOS's that need to have all display
92 * devices blanked and not just the first one.
93 * Ross Paterson <ross@soi.city.ac.uk>
94 * Fix segment limit setting it has always been wrong as
95 * the segments needed to have byte granularity.
96 * Mark a few things __init.
97 * Add hack to allow power off of SMP systems by popular request.
98 * Use CONFIG_SMP instead of __SMP__
99 * Ignore BOUNCES for three seconds.
100 * Stephen Rothwell
101 * 1.10: Fix for Thinkpad return code.
102 * Merge 2.2 and 2.3 drivers.
103 * Remove APM dependencies in arch/i386/kernel/process.c
104 * Remove APM dependencies in drivers/char/sysrq.c
105 * Reset time across standby.
106 * Allow more inititialisation on SMP.
107 * Remove CONFIG_APM_POWER_OFF and make it boot time
108 * configurable (default on).
109 * Make debug only a boot time parameter (remove APM_DEBUG).
110 * Try to blank all devices on any error.
111 * 1.11: Remove APM dependencies in drivers/char/console.c
112 * Check nr_running to detect if we are idle (from
113 * Borislav Deianov <borislav@lix.polytechnique.fr>)
114 * Fix for bioses that don't zero the top part of the
115 * entrypoint offset (Mario Sitta <sitta@al.unipmn.it>)
116 * (reported by Panos Katsaloulis <teras@writeme.com>).
117 * Real mode power off patch (Walter Hofmann
118 * <Walter.Hofmann@physik.stud.uni-erlangen.de>).
119 * 1.12: Remove CONFIG_SMP as the compiler will optimize
120 * the code away anyway (smp_num_cpus == 1 in UP)
121 * noted by Artur Skawina <skawina@geocities.com>.
122 * Make power off under SMP work again.
123 * Fix thinko with initial engaging of BIOS.
124 * Make sure power off only happens on CPU 0
125 * (Paul "Rusty" Russell <rusty@rustcorp.com.au>).
126 * Do error notification to user mode if BIOS calls fail.
127 * Move entrypoint offset fix to ...boot/setup.S
128 * where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>).
129 * Remove smp-power-off. SMP users must now specify
130 * "apm=power-off" on the kernel command line. Suggested
131 * by Jim Avera <jima@hal.com>, modified by Alan Cox
132 * <alan@lxorguk.ukuu.org.uk>.
133 * Register the /proc/apm entry even on SMP so that
134 * scripts that check for it before doing power off
135 * work (Jim Avera <jima@hal.com>).
136 * 1.13: Changes for new pm_ interfaces (Andy Henroid
137 * <andy_henroid@yahoo.com>).
138 * Modularize the code.
139 * Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS
140 * is now the way life works).
141 * Fix thinko in suspend() (wrong return).
142 * Notify drivers on critical suspend.
143 * Make kapmd absorb more idle time (Pavel Machek <pavel@suse.cz>
144 * modified by sfr).
145 * Disable interrupts while we are suspended (Andy Henroid
146 * <andy_henroid@yahoo.com> fixed by sfr).
147 * Make power off work on SMP again (Tony Hoyle
148 * <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr.
149 * Remove CONFIG_APM_SUSPEND_BOUNCE. The bounce ignore
150 * interval is now configurable.
151 * 1.14: Make connection version persist across module unload/load.
152 * Enable and engage power management earlier.
153 * Disengage power management on module unload.
154 * Changed to use the sysrq-register hack for registering the
155 * power off function called by magic sysrq based upon discussions
156 * in irc://irc.openprojects.net/#kernelnewbies
157 * (Crutcher Dunnavant <crutcher+kernel@datastacks.com>).
158 * Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable.
159 * (Arjan van de Ven <arjanv@redhat.com>) modified by sfr.
160 * Work around byte swap bug in one of the Vaio's BIOS's
161 * (Marc Boucher <marc@mbsi.ca>).
162 * Exposed the disable flag to dmi so that we can handle known
163 * broken APM (Alan Cox <alan@redhat.com>).
164 * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
165 * calling it - instead idle. (Alan Cox <alan@redhat.com>)
166 * If an APM idle fails log it and idle sensibly
167 * 1.15: Don't queue events to clients who open the device O_WRONLY.
168 * Don't expect replies from clients who open the device O_RDONLY.
169 * (Idea from Thomas Hood)
170 * Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>)
171 * 1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.)
172 * Notify listeners of standby or suspend events before notifying
173 * drivers. Return EBUSY to ioctl() if suspend is rejected.
174 * (Russell King <rmk@arm.linux.org.uk> and Thomas Hood)
175 * Ignore first resume after we generate our own resume event
176 * after a suspend (Thomas Hood)
177 * Daemonize now gets rid of our controlling terminal (sfr).
178 * CONFIG_APM_CPU_IDLE now just affects the default value of
179 * idle_threshold (sfr).
180 * Change name of kernel apm daemon (as it no longer idles) (sfr).
181 * 1.16ac: Fix up SMP support somewhat. You can now force SMP on and we
182 * make _all_ APM calls on the CPU#0. Fix unsafe sign bug.
183 * TODO: determine if its "boot CPU" or "CPU0" we want to lock to.
184 *
185 * APM 1.1 Reference:
186 *
187 * Intel Corporation, Microsoft Corporation. Advanced Power Management
188 * (APM) BIOS Interface Specification, Revision 1.1, September 1993.
189 * Intel Order Number 241704-001. Microsoft Part Number 781-110-X01.
190 *
191 * [This document is available free from Intel by calling 800.628.8686 (fax
192 * 916.356.6100) or 800.548.4725; or via anonymous ftp from
193 * ftp://ftp.intel.com/pub/IAL/software_specs/apmv11.doc. It is also
194 * available from Microsoft by calling 206.882.8080.]
195 *
196 * APM 1.2 Reference:
197 * Intel Corporation, Microsoft Corporation. Advanced Power Management
198 * (APM) BIOS Interface Specification, Revision 1.2, February 1996.
199 *
200 * [This document is available from Microsoft at:
201 * http://www.microsoft.com/whdc/archive/amp_12.mspx]
202 */
203
204 #include <linux/module.h>
205
206 #include <linux/poll.h>
207 #include <linux/types.h>
208 #include <linux/stddef.h>
209 #include <linux/timer.h>
210 #include <linux/fcntl.h>
211 #include <linux/slab.h>
212 #include <linux/stat.h>
213 #include <linux/proc_fs.h>
214 #include <linux/seq_file.h>
215 #include <linux/miscdevice.h>
216 #include <linux/apm_bios.h>
217 #include <linux/init.h>
218 #include <linux/time.h>
219 #include <linux/sched.h>
220 #include <linux/pm.h>
221 #include <linux/pm_legacy.h>
222 #include <linux/capability.h>
223 #include <linux/device.h>
224 #include <linux/kernel.h>
225 #include <linux/smp.h>
226 #include <linux/smp_lock.h>
227 #include <linux/dmi.h>
228 #include <linux/suspend.h>
229 #include <linux/kthread.h>
230
231 #include <asm/system.h>
232 #include <asm/uaccess.h>
233 #include <asm/desc.h>
234 #include <asm/i8253.h>
235 #include <asm/paravirt.h>
236
237 #include "io_ports.h"
238
239 extern void machine_real_restart(unsigned char *, int);
240
241 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
242 extern int (*console_blank_hook)(int);
243 #endif
244
245 /*
246 * The apm_bios device is one of the misc char devices.
247 * This is its minor number.
248 */
249 #define APM_MINOR_DEV 134
250
251 /*
252 * See Documentation/Config.help for the configuration options.
253 *
254 * Various options can be changed at boot time as follows:
255 * (We allow underscores for compatibility with the modules code)
256 * apm=on/off enable/disable APM
257 * [no-]allow[-_]ints allow interrupts during BIOS calls
258 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
259 * [no-]realmode[-_]power[-_]off switch to real mode before
260 * powering off
261 * [no-]debug log some debugging messages
262 * [no-]power[-_]off power off on shutdown
263 * [no-]smp Use apm even on an SMP box
264 * bounce[-_]interval=<n> number of ticks to ignore suspend
265 * bounces
266 * idle[-_]threshold=<n> System idle percentage above which to
267 * make APM BIOS idle calls. Set it to
268 * 100 to disable.
269 * idle[-_]period=<n> Period (in 1/100s of a second) over
270 * which the idle percentage is
271 * calculated.
272 */
273
274 /* KNOWN PROBLEM MACHINES:
275 *
276 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
277 * [Confirmed by TI representative]
278 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
279 * [Confirmed by BIOS disassembly]
280 * [This may work now ...]
281 * P: Toshiba 1950S: battery life information only gets updated after resume
282 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
283 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
284 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
285 * Neale Banks <neale@lowendale.com.au> December 2000
286 *
287 * Legend: U = unusable with APM patches
288 * P = partially usable with APM patches
289 */
290
291 /*
292 * Define as 1 to make the driver always call the APM BIOS busy
293 * routine even if the clock was not reported as slowed by the
294 * idle routine. Otherwise, define as 0.
295 */
296 #define ALWAYS_CALL_BUSY 1
297
298 /*
299 * Define to make the APM BIOS calls zero all data segment registers (so
300 * that an incorrect BIOS implementation will cause a kernel panic if it
301 * tries to write to arbitrary memory).
302 */
303 #define APM_ZERO_SEGS
304
305 #include "apm.h"
306
307 /*
308 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
309 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
310 * David Chen <chen@ctpa04.mit.edu>
311 */
312 #undef INIT_TIMER_AFTER_SUSPEND
313
314 #ifdef INIT_TIMER_AFTER_SUSPEND
315 #include <linux/timex.h>
316 #include <asm/io.h>
317 #include <linux/delay.h>
318 #endif
319
320 /*
321 * Need to poll the APM BIOS every second
322 */
323 #define APM_CHECK_TIMEOUT (HZ)
324
325 /*
326 * Ignore suspend events for this amount of time after a resume
327 */
328 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
329
330 /*
331 * Maximum number of events stored
332 */
333 #define APM_MAX_EVENTS 20
334
335 /*
336 * The per-file APM data
337 */
338 struct apm_user {
339 int magic;
340 struct apm_user * next;
341 unsigned int suser: 1;
342 unsigned int writer: 1;
343 unsigned int reader: 1;
344 unsigned int suspend_wait: 1;
345 int suspend_result;
346 int suspends_pending;
347 int standbys_pending;
348 int suspends_read;
349 int standbys_read;
350 int event_head;
351 int event_tail;
352 apm_event_t events[APM_MAX_EVENTS];
353 };
354
355 /*
356 * The magic number in apm_user
357 */
358 #define APM_BIOS_MAGIC 0x4101
359
360 /*
361 * idle percentage above which bios idle calls are done
362 */
363 #ifdef CONFIG_APM_CPU_IDLE
364 #define DEFAULT_IDLE_THRESHOLD 95
365 #else
366 #define DEFAULT_IDLE_THRESHOLD 100
367 #endif
368 #define DEFAULT_IDLE_PERIOD (100 / 3)
369
370 /*
371 * Local variables
372 */
373 static struct {
374 unsigned long offset;
375 unsigned short segment;
376 } apm_bios_entry;
377 static int clock_slowed;
378 static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
379 static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
380 static int set_pm_idle;
381 static int suspends_pending;
382 static int standbys_pending;
383 static int ignore_sys_suspend;
384 static int ignore_normal_resume;
385 static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
386
387 #ifdef CONFIG_APM_RTC_IS_GMT
388 # define clock_cmos_diff 0
389 # define got_clock_diff 1
390 #else
391 static long clock_cmos_diff;
392 static int got_clock_diff;
393 #endif
394 static int debug __read_mostly;
395 static int smp __read_mostly;
396 static int apm_disabled = -1;
397 #ifdef CONFIG_SMP
398 static int power_off;
399 #else
400 static int power_off = 1;
401 #endif
402 #ifdef CONFIG_APM_REAL_MODE_POWER_OFF
403 static int realmode_power_off = 1;
404 #else
405 static int realmode_power_off;
406 #endif
407 #ifdef CONFIG_APM_ALLOW_INTS
408 static int allow_ints = 1;
409 #else
410 static int allow_ints;
411 #endif
412 static int broken_psr;
413
414 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
415 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
416 static struct apm_user * user_list;
417 static DEFINE_SPINLOCK(user_list_lock);
418 static const struct desc_struct bad_bios_desc = { 0, 0x00409200 };
419
420 static const char driver_version[] = "1.16ac"; /* no spaces */
421
422 static struct task_struct *kapmd_task;
423
424 /*
425 * APM event names taken from the APM 1.2 specification. These are
426 * the message codes that the BIOS uses to tell us about events
427 */
428 static const char * const apm_event_name[] = {
429 "system standby",
430 "system suspend",
431 "normal resume",
432 "critical resume",
433 "low battery",
434 "power status change",
435 "update time",
436 "critical suspend",
437 "user standby",
438 "user suspend",
439 "system standby resume",
440 "capabilities change"
441 };
442 #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
443
444 typedef struct lookup_t {
445 int key;
446 char * msg;
447 } lookup_t;
448
449 /*
450 * The BIOS returns a set of standard error codes in AX when the
451 * carry flag is set.
452 */
453
454 static const lookup_t error_table[] = {
455 /* N/A { APM_SUCCESS, "Operation succeeded" }, */
456 { APM_DISABLED, "Power management disabled" },
457 { APM_CONNECTED, "Real mode interface already connected" },
458 { APM_NOT_CONNECTED, "Interface not connected" },
459 { APM_16_CONNECTED, "16 bit interface already connected" },
460 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
461 { APM_32_CONNECTED, "32 bit interface already connected" },
462 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
463 { APM_BAD_DEVICE, "Unrecognized device ID" },
464 { APM_BAD_PARAM, "Parameter out of range" },
465 { APM_NOT_ENGAGED, "Interface not engaged" },
466 { APM_BAD_FUNCTION, "Function not supported" },
467 { APM_RESUME_DISABLED, "Resume timer disabled" },
468 { APM_BAD_STATE, "Unable to enter requested state" },
469 /* N/A { APM_NO_EVENTS, "No events pending" }, */
470 { APM_NO_ERROR, "BIOS did not set a return code" },
471 { APM_NOT_PRESENT, "No APM present" }
472 };
473 #define ERROR_COUNT ARRAY_SIZE(error_table)
474
475 /**
476 * apm_error - display an APM error
477 * @str: information string
478 * @err: APM BIOS return code
479 *
480 * Write a meaningful log entry to the kernel log in the event of
481 * an APM error.
482 */
483
484 static void apm_error(char *str, int err)
485 {
486 int i;
487
488 for (i = 0; i < ERROR_COUNT; i++)
489 if (error_table[i].key == err) break;
490 if (i < ERROR_COUNT)
491 printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
492 else
493 printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
494 str, err);
495 }
496
497 /*
498 * Lock APM functionality to physical CPU 0
499 */
500
501 #ifdef CONFIG_SMP
502
503 static cpumask_t apm_save_cpus(void)
504 {
505 cpumask_t x = current->cpus_allowed;
506 /* Some bioses don't like being called from CPU != 0 */
507 set_cpus_allowed(current, cpumask_of_cpu(0));
508 BUG_ON(smp_processor_id() != 0);
509 return x;
510 }
511
512 static inline void apm_restore_cpus(cpumask_t mask)
513 {
514 set_cpus_allowed(current, mask);
515 }
516
517 #else
518
519 /*
520 * No CPU lockdown needed on a uniprocessor
521 */
522
523 #define apm_save_cpus() (current->cpus_allowed)
524 #define apm_restore_cpus(x) (void)(x)
525
526 #endif
527
528 /*
529 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
530 * apm_info.allow_ints, we are being really paranoid here! Not only
531 * are interrupts disabled, but all the segment registers (except SS)
532 * are saved and zeroed this means that if the BIOS tries to reference
533 * any data without explicitly loading the segment registers, the kernel
534 * will fault immediately rather than have some unforeseen circumstances
535 * for the rest of the kernel. And it will be very obvious! :-) Doing
536 * this depends on CS referring to the same physical memory as DS so that
537 * DS can be zeroed before the call. Unfortunately, we can't do anything
538 * about the stack segment/pointer. Also, we tell the compiler that
539 * everything could change.
540 *
541 * Also, we KNOW that for the non error case of apm_bios_call, there
542 * is no useful data returned in the low order 8 bits of eax.
543 */
544
545 static inline unsigned long __apm_irq_save(void)
546 {
547 unsigned long flags;
548 local_save_flags(flags);
549 if (apm_info.allow_ints) {
550 if (irqs_disabled_flags(flags))
551 local_irq_enable();
552 } else
553 local_irq_disable();
554
555 return flags;
556 }
557
558 #define apm_irq_save(flags) \
559 do { flags = __apm_irq_save(); } while (0)
560
561 static inline void apm_irq_restore(unsigned long flags)
562 {
563 if (irqs_disabled_flags(flags))
564 local_irq_disable();
565 else if (irqs_disabled())
566 local_irq_enable();
567 }
568
569 #ifdef APM_ZERO_SEGS
570 # define APM_DECL_SEGS \
571 unsigned int saved_fs; unsigned int saved_gs;
572 # define APM_DO_SAVE_SEGS \
573 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
574 # define APM_DO_RESTORE_SEGS \
575 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
576 #else
577 # define APM_DECL_SEGS
578 # define APM_DO_SAVE_SEGS
579 # define APM_DO_RESTORE_SEGS
580 #endif
581
582 /**
583 * apm_bios_call - Make an APM BIOS 32bit call
584 * @func: APM function to execute
585 * @ebx_in: EBX register for call entry
586 * @ecx_in: ECX register for call entry
587 * @eax: EAX register return
588 * @ebx: EBX register return
589 * @ecx: ECX register return
590 * @edx: EDX register return
591 * @esi: ESI register return
592 *
593 * Make an APM call using the 32bit protected mode interface. The
594 * caller is responsible for knowing if APM BIOS is configured and
595 * enabled. This call can disable interrupts for a long period of
596 * time on some laptops. The return value is in AH and the carry
597 * flag is loaded into AL. If there is an error, then the error
598 * code is returned in AH (bits 8-15 of eax) and this function
599 * returns non-zero.
600 */
601
602 static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in,
603 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi)
604 {
605 APM_DECL_SEGS
606 unsigned long flags;
607 cpumask_t cpus;
608 int cpu;
609 struct desc_struct save_desc_40;
610 struct desc_struct *gdt;
611
612 cpus = apm_save_cpus();
613
614 cpu = get_cpu();
615 gdt = get_cpu_gdt_table(cpu);
616 save_desc_40 = gdt[0x40 / 8];
617 gdt[0x40 / 8] = bad_bios_desc;
618
619 apm_irq_save(flags);
620 APM_DO_SAVE_SEGS;
621 apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi);
622 APM_DO_RESTORE_SEGS;
623 apm_irq_restore(flags);
624 gdt[0x40 / 8] = save_desc_40;
625 put_cpu();
626 apm_restore_cpus(cpus);
627
628 return *eax & 0xff;
629 }
630
631 /**
632 * apm_bios_call_simple - make a simple APM BIOS 32bit call
633 * @func: APM function to invoke
634 * @ebx_in: EBX register value for BIOS call
635 * @ecx_in: ECX register value for BIOS call
636 * @eax: EAX register on return from the BIOS call
637 *
638 * Make a BIOS call that returns one value only, or just status.
639 * If there is an error, then the error code is returned in AH
640 * (bits 8-15 of eax) and this function returns non-zero. This is
641 * used for simpler BIOS operations. This call may hold interrupts
642 * off for a long time on some laptops.
643 */
644
645 static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax)
646 {
647 u8 error;
648 APM_DECL_SEGS
649 unsigned long flags;
650 cpumask_t cpus;
651 int cpu;
652 struct desc_struct save_desc_40;
653 struct desc_struct *gdt;
654
655 cpus = apm_save_cpus();
656
657 cpu = get_cpu();
658 gdt = get_cpu_gdt_table(cpu);
659 save_desc_40 = gdt[0x40 / 8];
660 gdt[0x40 / 8] = bad_bios_desc;
661
662 apm_irq_save(flags);
663 APM_DO_SAVE_SEGS;
664 error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax);
665 APM_DO_RESTORE_SEGS;
666 apm_irq_restore(flags);
667 gdt[0x40 / 8] = save_desc_40;
668 put_cpu();
669 apm_restore_cpus(cpus);
670 return error;
671 }
672
673 /**
674 * apm_driver_version - APM driver version
675 * @val: loaded with the APM version on return
676 *
677 * Retrieve the APM version supported by the BIOS. This is only
678 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
679 * probably present.
680 *
681 * On entry val should point to a value indicating the APM driver
682 * version with the high byte being the major and the low byte the
683 * minor number both in BCD
684 *
685 * On return it will hold the BIOS revision supported in the
686 * same format.
687 */
688
689 static int apm_driver_version(u_short *val)
690 {
691 u32 eax;
692
693 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax))
694 return (eax >> 8) & 0xff;
695 *val = eax;
696 return APM_SUCCESS;
697 }
698
699 /**
700 * apm_get_event - get an APM event from the BIOS
701 * @event: pointer to the event
702 * @info: point to the event information
703 *
704 * The APM BIOS provides a polled information for event
705 * reporting. The BIOS expects to be polled at least every second
706 * when events are pending. When a message is found the caller should
707 * poll until no more messages are present. However, this causes
708 * problems on some laptops where a suspend event notification is
709 * not cleared until it is acknowledged.
710 *
711 * Additional information is returned in the info pointer, providing
712 * that APM 1.2 is in use. If no messges are pending the value 0x80
713 * is returned (No power management events pending).
714 */
715
716 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
717 {
718 u32 eax;
719 u32 ebx;
720 u32 ecx;
721 u32 dummy;
722
723 if (apm_bios_call(APM_FUNC_GET_EVENT, 0, 0, &eax, &ebx, &ecx,
724 &dummy, &dummy))
725 return (eax >> 8) & 0xff;
726 *event = ebx;
727 if (apm_info.connection_version < 0x0102)
728 *info = ~0; /* indicate info not valid */
729 else
730 *info = ecx;
731 return APM_SUCCESS;
732 }
733
734 /**
735 * set_power_state - set the power management state
736 * @what: which items to transition
737 * @state: state to transition to
738 *
739 * Request an APM change of state for one or more system devices. The
740 * processor state must be transitioned last of all. what holds the
741 * class of device in the upper byte and the device number (0xFF for
742 * all) for the object to be transitioned.
743 *
744 * The state holds the state to transition to, which may in fact
745 * be an acceptance of a BIOS requested state change.
746 */
747
748 static int set_power_state(u_short what, u_short state)
749 {
750 u32 eax;
751
752 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax))
753 return (eax >> 8) & 0xff;
754 return APM_SUCCESS;
755 }
756
757 /**
758 * set_system_power_state - set system wide power state
759 * @state: which state to enter
760 *
761 * Transition the entire system into a new APM power state.
762 */
763
764 static int set_system_power_state(u_short state)
765 {
766 return set_power_state(APM_DEVICE_ALL, state);
767 }
768
769 /**
770 * apm_do_idle - perform power saving
771 *
772 * This function notifies the BIOS that the processor is (in the view
773 * of the OS) idle. It returns -1 in the event that the BIOS refuses
774 * to handle the idle request. On a success the function returns 1
775 * if the BIOS did clock slowing or 0 otherwise.
776 */
777
778 static int apm_do_idle(void)
779 {
780 u32 eax;
781 u8 ret = 0;
782 int idled = 0;
783 int polling;
784
785 polling = !!(current_thread_info()->status & TS_POLLING);
786 if (polling) {
787 current_thread_info()->status &= ~TS_POLLING;
788 /*
789 * TS_POLLING-cleared state must be visible before we
790 * test NEED_RESCHED:
791 */
792 smp_mb();
793 }
794 if (!need_resched()) {
795 idled = 1;
796 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax);
797 }
798 if (polling)
799 current_thread_info()->status |= TS_POLLING;
800
801 if (!idled)
802 return 0;
803
804 if (ret) {
805 static unsigned long t;
806
807 /* This always fails on some SMP boards running UP kernels.
808 * Only report the failure the first 5 times.
809 */
810 if (++t < 5)
811 {
812 printk(KERN_DEBUG "apm_do_idle failed (%d)\n",
813 (eax >> 8) & 0xff);
814 t = jiffies;
815 }
816 return -1;
817 }
818 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
819 return clock_slowed;
820 }
821
822 /**
823 * apm_do_busy - inform the BIOS the CPU is busy
824 *
825 * Request that the BIOS brings the CPU back to full performance.
826 */
827
828 static void apm_do_busy(void)
829 {
830 u32 dummy;
831
832 if (clock_slowed || ALWAYS_CALL_BUSY) {
833 (void) apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy);
834 clock_slowed = 0;
835 }
836 }
837
838 /*
839 * If no process has really been interested in
840 * the CPU for some time, we want to call BIOS
841 * power management - we probably want
842 * to conserve power.
843 */
844 #define IDLE_CALC_LIMIT (HZ * 100)
845 #define IDLE_LEAKY_MAX 16
846
847 static void (*original_pm_idle)(void) __read_mostly;
848
849 /**
850 * apm_cpu_idle - cpu idling for APM capable Linux
851 *
852 * This is the idling function the kernel executes when APM is available. It
853 * tries to do BIOS powermanagement based on the average system idle time.
854 * Furthermore it calls the system default idle routine.
855 */
856
857 static void apm_cpu_idle(void)
858 {
859 static int use_apm_idle; /* = 0 */
860 static unsigned int last_jiffies; /* = 0 */
861 static unsigned int last_stime; /* = 0 */
862
863 int apm_idle_done = 0;
864 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
865 unsigned int bucket;
866
867 recalc:
868 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
869 use_apm_idle = 0;
870 last_jiffies = jiffies;
871 last_stime = current->stime;
872 } else if (jiffies_since_last_check > idle_period) {
873 unsigned int idle_percentage;
874
875 idle_percentage = current->stime - last_stime;
876 idle_percentage *= 100;
877 idle_percentage /= jiffies_since_last_check;
878 use_apm_idle = (idle_percentage > idle_threshold);
879 if (apm_info.forbid_idle)
880 use_apm_idle = 0;
881 last_jiffies = jiffies;
882 last_stime = current->stime;
883 }
884
885 bucket = IDLE_LEAKY_MAX;
886
887 while (!need_resched()) {
888 if (use_apm_idle) {
889 unsigned int t;
890
891 t = jiffies;
892 switch (apm_do_idle()) {
893 case 0: apm_idle_done = 1;
894 if (t != jiffies) {
895 if (bucket) {
896 bucket = IDLE_LEAKY_MAX;
897 continue;
898 }
899 } else if (bucket) {
900 bucket--;
901 continue;
902 }
903 break;
904 case 1: apm_idle_done = 1;
905 break;
906 default: /* BIOS refused */
907 break;
908 }
909 }
910 if (original_pm_idle)
911 original_pm_idle();
912 else
913 default_idle();
914 jiffies_since_last_check = jiffies - last_jiffies;
915 if (jiffies_since_last_check > idle_period)
916 goto recalc;
917 }
918
919 if (apm_idle_done)
920 apm_do_busy();
921 }
922
923 /**
924 * apm_power_off - ask the BIOS to power off
925 *
926 * Handle the power off sequence. This is the one piece of code we
927 * will execute even on SMP machines. In order to deal with BIOS
928 * bugs we support real mode APM BIOS power off calls. We also make
929 * the SMP call on CPU0 as some systems will only honour this call
930 * on their first cpu.
931 */
932
933 static void apm_power_off(void)
934 {
935 unsigned char po_bios_call[] = {
936 0xb8, 0x00, 0x10, /* movw $0x1000,ax */
937 0x8e, 0xd0, /* movw ax,ss */
938 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
939 0xb8, 0x07, 0x53, /* movw $0x5307,ax */
940 0xbb, 0x01, 0x00, /* movw $0x0001,bx */
941 0xb9, 0x03, 0x00, /* movw $0x0003,cx */
942 0xcd, 0x15 /* int $0x15 */
943 };
944
945 /* Some bioses don't like being called from CPU != 0 */
946 if (apm_info.realmode_power_off)
947 {
948 (void)apm_save_cpus();
949 machine_real_restart(po_bios_call, sizeof(po_bios_call));
950 }
951 else
952 (void) set_system_power_state(APM_STATE_OFF);
953 }
954
955 #ifdef CONFIG_APM_DO_ENABLE
956
957 /**
958 * apm_enable_power_management - enable BIOS APM power management
959 * @enable: enable yes/no
960 *
961 * Enable or disable the APM BIOS power services.
962 */
963
964 static int apm_enable_power_management(int enable)
965 {
966 u32 eax;
967
968 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
969 return APM_NOT_ENGAGED;
970 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
971 enable, &eax))
972 return (eax >> 8) & 0xff;
973 if (enable)
974 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
975 else
976 apm_info.bios.flags |= APM_BIOS_DISABLED;
977 return APM_SUCCESS;
978 }
979 #endif
980
981 /**
982 * apm_get_power_status - get current power state
983 * @status: returned status
984 * @bat: battery info
985 * @life: estimated life
986 *
987 * Obtain the current power status from the APM BIOS. We return a
988 * status which gives the rough battery status, and current power
989 * source. The bat value returned give an estimate as a percentage
990 * of life and a status value for the battery. The estimated life
991 * if reported is a lifetime in secodnds/minutes at current powwer
992 * consumption.
993 */
994
995 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
996 {
997 u32 eax;
998 u32 ebx;
999 u32 ecx;
1000 u32 edx;
1001 u32 dummy;
1002
1003 if (apm_info.get_power_status_broken)
1004 return APM_32_UNSUPPORTED;
1005 if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0,
1006 &eax, &ebx, &ecx, &edx, &dummy))
1007 return (eax >> 8) & 0xff;
1008 *status = ebx;
1009 *bat = ecx;
1010 if (apm_info.get_power_status_swabinminutes) {
1011 *life = swab16((u16)edx);
1012 *life |= 0x8000;
1013 } else
1014 *life = edx;
1015 return APM_SUCCESS;
1016 }
1017
1018 #if 0
1019 static int apm_get_battery_status(u_short which, u_short *status,
1020 u_short *bat, u_short *life, u_short *nbat)
1021 {
1022 u32 eax;
1023 u32 ebx;
1024 u32 ecx;
1025 u32 edx;
1026 u32 esi;
1027
1028 if (apm_info.connection_version < 0x0102) {
1029 /* pretend we only have one battery. */
1030 if (which != 1)
1031 return APM_BAD_DEVICE;
1032 *nbat = 1;
1033 return apm_get_power_status(status, bat, life);
1034 }
1035
1036 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1037 &ebx, &ecx, &edx, &esi))
1038 return (eax >> 8) & 0xff;
1039 *status = ebx;
1040 *bat = ecx;
1041 *life = edx;
1042 *nbat = esi;
1043 return APM_SUCCESS;
1044 }
1045 #endif
1046
1047 /**
1048 * apm_engage_power_management - enable PM on a device
1049 * @device: identity of device
1050 * @enable: on/off
1051 *
1052 * Activate or deactive power management on either a specific device
1053 * or the entire system (%APM_DEVICE_ALL).
1054 */
1055
1056 static int apm_engage_power_management(u_short device, int enable)
1057 {
1058 u32 eax;
1059
1060 if ((enable == 0) && (device == APM_DEVICE_ALL)
1061 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1062 return APM_DISABLED;
1063 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax))
1064 return (eax >> 8) & 0xff;
1065 if (device == APM_DEVICE_ALL) {
1066 if (enable)
1067 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1068 else
1069 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1070 }
1071 return APM_SUCCESS;
1072 }
1073
1074 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1075
1076 /**
1077 * apm_console_blank - blank the display
1078 * @blank: on/off
1079 *
1080 * Attempt to blank the console, firstly by blanking just video device
1081 * zero, and if that fails (some BIOSes don't support it) then it blanks
1082 * all video devices. Typically the BIOS will do laptop backlight and
1083 * monitor powerdown for us.
1084 */
1085
1086 static int apm_console_blank(int blank)
1087 {
1088 int error = APM_NOT_ENGAGED; /* silence gcc */
1089 int i;
1090 u_short state;
1091 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1092
1093 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1094
1095 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1096 error = set_power_state(dev[i], state);
1097
1098 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1099 return 1;
1100
1101 if (error == APM_NOT_ENGAGED)
1102 break;
1103 }
1104
1105 if (error == APM_NOT_ENGAGED) {
1106 static int tried;
1107 int eng_error;
1108 if (tried++ == 0) {
1109 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1110 if (eng_error) {
1111 apm_error("set display", error);
1112 apm_error("engage interface", eng_error);
1113 return 0;
1114 } else
1115 return apm_console_blank(blank);
1116 }
1117 }
1118 apm_error("set display", error);
1119 return 0;
1120 }
1121 #endif
1122
1123 static int queue_empty(struct apm_user *as)
1124 {
1125 return as->event_head == as->event_tail;
1126 }
1127
1128 static apm_event_t get_queued_event(struct apm_user *as)
1129 {
1130 if (++as->event_tail >= APM_MAX_EVENTS)
1131 as->event_tail = 0;
1132 return as->events[as->event_tail];
1133 }
1134
1135 static void queue_event(apm_event_t event, struct apm_user *sender)
1136 {
1137 struct apm_user * as;
1138
1139 spin_lock(&user_list_lock);
1140 if (user_list == NULL)
1141 goto out;
1142 for (as = user_list; as != NULL; as = as->next) {
1143 if ((as == sender) || (!as->reader))
1144 continue;
1145 if (++as->event_head >= APM_MAX_EVENTS)
1146 as->event_head = 0;
1147
1148 if (as->event_head == as->event_tail) {
1149 static int notified;
1150
1151 if (notified++ == 0)
1152 printk(KERN_ERR "apm: an event queue overflowed\n");
1153 if (++as->event_tail >= APM_MAX_EVENTS)
1154 as->event_tail = 0;
1155 }
1156 as->events[as->event_head] = event;
1157 if ((!as->suser) || (!as->writer))
1158 continue;
1159 switch (event) {
1160 case APM_SYS_SUSPEND:
1161 case APM_USER_SUSPEND:
1162 as->suspends_pending++;
1163 suspends_pending++;
1164 break;
1165
1166 case APM_SYS_STANDBY:
1167 case APM_USER_STANDBY:
1168 as->standbys_pending++;
1169 standbys_pending++;
1170 break;
1171 }
1172 }
1173 wake_up_interruptible(&apm_waitqueue);
1174 out:
1175 spin_unlock(&user_list_lock);
1176 }
1177
1178 static void reinit_timer(void)
1179 {
1180 #ifdef INIT_TIMER_AFTER_SUSPEND
1181 unsigned long flags;
1182
1183 spin_lock_irqsave(&i8253_lock, flags);
1184 /* set the clock to 100 Hz */
1185 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1186 udelay(10);
1187 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1188 udelay(10);
1189 outb(LATCH >> 8, PIT_CH0); /* MSB */
1190 udelay(10);
1191 spin_unlock_irqrestore(&i8253_lock, flags);
1192 #endif
1193 }
1194
1195 static int suspend(int vetoable)
1196 {
1197 int err;
1198 struct apm_user *as;
1199
1200 if (pm_send_all(PM_SUSPEND, (void *)3)) {
1201 /* Vetoed */
1202 if (vetoable) {
1203 if (apm_info.connection_version > 0x100)
1204 set_system_power_state(APM_STATE_REJECT);
1205 err = -EBUSY;
1206 ignore_sys_suspend = 0;
1207 printk(KERN_WARNING "apm: suspend was vetoed.\n");
1208 goto out;
1209 }
1210 printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
1211 }
1212
1213 device_suspend(PMSG_SUSPEND);
1214 local_irq_disable();
1215 device_power_down(PMSG_SUSPEND);
1216
1217 local_irq_enable();
1218
1219 save_processor_state();
1220 err = set_system_power_state(APM_STATE_SUSPEND);
1221 ignore_normal_resume = 1;
1222 restore_processor_state();
1223
1224 local_irq_disable();
1225 reinit_timer();
1226
1227 if (err == APM_NO_ERROR)
1228 err = APM_SUCCESS;
1229 if (err != APM_SUCCESS)
1230 apm_error("suspend", err);
1231 err = (err == APM_SUCCESS) ? 0 : -EIO;
1232 device_power_up();
1233 local_irq_enable();
1234 device_resume();
1235 pm_send_all(PM_RESUME, (void *)0);
1236 queue_event(APM_NORMAL_RESUME, NULL);
1237 out:
1238 spin_lock(&user_list_lock);
1239 for (as = user_list; as != NULL; as = as->next) {
1240 as->suspend_wait = 0;
1241 as->suspend_result = err;
1242 }
1243 spin_unlock(&user_list_lock);
1244 wake_up_interruptible(&apm_suspend_waitqueue);
1245 return err;
1246 }
1247
1248 static void standby(void)
1249 {
1250 int err;
1251
1252 local_irq_disable();
1253 device_power_down(PMSG_SUSPEND);
1254 local_irq_enable();
1255
1256 err = set_system_power_state(APM_STATE_STANDBY);
1257 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1258 apm_error("standby", err);
1259
1260 local_irq_disable();
1261 device_power_up();
1262 local_irq_enable();
1263 }
1264
1265 static apm_event_t get_event(void)
1266 {
1267 int error;
1268 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1269 apm_eventinfo_t info;
1270
1271 static int notified;
1272
1273 /* we don't use the eventinfo */
1274 error = apm_get_event(&event, &info);
1275 if (error == APM_SUCCESS)
1276 return event;
1277
1278 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1279 apm_error("get_event", error);
1280
1281 return 0;
1282 }
1283
1284 static void check_events(void)
1285 {
1286 apm_event_t event;
1287 static unsigned long last_resume;
1288 static int ignore_bounce;
1289
1290 while ((event = get_event()) != 0) {
1291 if (debug) {
1292 if (event <= NR_APM_EVENT_NAME)
1293 printk(KERN_DEBUG "apm: received %s notify\n",
1294 apm_event_name[event - 1]);
1295 else
1296 printk(KERN_DEBUG "apm: received unknown "
1297 "event 0x%02x\n", event);
1298 }
1299 if (ignore_bounce
1300 && ((jiffies - last_resume) > bounce_interval))
1301 ignore_bounce = 0;
1302
1303 switch (event) {
1304 case APM_SYS_STANDBY:
1305 case APM_USER_STANDBY:
1306 queue_event(event, NULL);
1307 if (standbys_pending <= 0)
1308 standby();
1309 break;
1310
1311 case APM_USER_SUSPEND:
1312 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1313 if (apm_info.connection_version > 0x100)
1314 set_system_power_state(APM_STATE_REJECT);
1315 break;
1316 #endif
1317 case APM_SYS_SUSPEND:
1318 if (ignore_bounce) {
1319 if (apm_info.connection_version > 0x100)
1320 set_system_power_state(APM_STATE_REJECT);
1321 break;
1322 }
1323 /*
1324 * If we are already processing a SUSPEND,
1325 * then further SUSPEND events from the BIOS
1326 * will be ignored. We also return here to
1327 * cope with the fact that the Thinkpads keep
1328 * sending a SUSPEND event until something else
1329 * happens!
1330 */
1331 if (ignore_sys_suspend)
1332 return;
1333 ignore_sys_suspend = 1;
1334 queue_event(event, NULL);
1335 if (suspends_pending <= 0)
1336 (void) suspend(1);
1337 break;
1338
1339 case APM_NORMAL_RESUME:
1340 case APM_CRITICAL_RESUME:
1341 case APM_STANDBY_RESUME:
1342 ignore_sys_suspend = 0;
1343 last_resume = jiffies;
1344 ignore_bounce = 1;
1345 if ((event != APM_NORMAL_RESUME)
1346 || (ignore_normal_resume == 0)) {
1347 device_resume();
1348 pm_send_all(PM_RESUME, (void *)0);
1349 queue_event(event, NULL);
1350 }
1351 ignore_normal_resume = 0;
1352 break;
1353
1354 case APM_CAPABILITY_CHANGE:
1355 case APM_LOW_BATTERY:
1356 case APM_POWER_STATUS_CHANGE:
1357 queue_event(event, NULL);
1358 /* If needed, notify drivers here */
1359 break;
1360
1361 case APM_UPDATE_TIME:
1362 break;
1363
1364 case APM_CRITICAL_SUSPEND:
1365 /*
1366 * We are not allowed to reject a critical suspend.
1367 */
1368 (void) suspend(0);
1369 break;
1370 }
1371 }
1372 }
1373
1374 static void apm_event_handler(void)
1375 {
1376 static int pending_count = 4;
1377 int err;
1378
1379 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1380 if ((apm_info.connection_version > 0x100) &&
1381 (pending_count-- <= 0)) {
1382 pending_count = 4;
1383 if (debug)
1384 printk(KERN_DEBUG "apm: setting state busy\n");
1385 err = set_system_power_state(APM_STATE_BUSY);
1386 if (err)
1387 apm_error("busy", err);
1388 }
1389 } else
1390 pending_count = 4;
1391 check_events();
1392 }
1393
1394 /*
1395 * This is the APM thread main loop.
1396 */
1397
1398 static void apm_mainloop(void)
1399 {
1400 DECLARE_WAITQUEUE(wait, current);
1401
1402 add_wait_queue(&apm_waitqueue, &wait);
1403 set_current_state(TASK_INTERRUPTIBLE);
1404 for (;;) {
1405 schedule_timeout(APM_CHECK_TIMEOUT);
1406 if (kthread_should_stop())
1407 break;
1408 /*
1409 * Ok, check all events, check for idle (and mark us sleeping
1410 * so as not to count towards the load average)..
1411 */
1412 set_current_state(TASK_INTERRUPTIBLE);
1413 apm_event_handler();
1414 }
1415 remove_wait_queue(&apm_waitqueue, &wait);
1416 }
1417
1418 static int check_apm_user(struct apm_user *as, const char *func)
1419 {
1420 if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) {
1421 printk(KERN_ERR "apm: %s passed bad filp\n", func);
1422 return 1;
1423 }
1424 return 0;
1425 }
1426
1427 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1428 {
1429 struct apm_user * as;
1430 int i;
1431 apm_event_t event;
1432
1433 as = fp->private_data;
1434 if (check_apm_user(as, "read"))
1435 return -EIO;
1436 if ((int)count < sizeof(apm_event_t))
1437 return -EINVAL;
1438 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1439 return -EAGAIN;
1440 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1441 i = count;
1442 while ((i >= sizeof(event)) && !queue_empty(as)) {
1443 event = get_queued_event(as);
1444 if (copy_to_user(buf, &event, sizeof(event))) {
1445 if (i < count)
1446 break;
1447 return -EFAULT;
1448 }
1449 switch (event) {
1450 case APM_SYS_SUSPEND:
1451 case APM_USER_SUSPEND:
1452 as->suspends_read++;
1453 break;
1454
1455 case APM_SYS_STANDBY:
1456 case APM_USER_STANDBY:
1457 as->standbys_read++;
1458 break;
1459 }
1460 buf += sizeof(event);
1461 i -= sizeof(event);
1462 }
1463 if (i < count)
1464 return count - i;
1465 if (signal_pending(current))
1466 return -ERESTARTSYS;
1467 return 0;
1468 }
1469
1470 static unsigned int do_poll(struct file *fp, poll_table * wait)
1471 {
1472 struct apm_user * as;
1473
1474 as = fp->private_data;
1475 if (check_apm_user(as, "poll"))
1476 return 0;
1477 poll_wait(fp, &apm_waitqueue, wait);
1478 if (!queue_empty(as))
1479 return POLLIN | POLLRDNORM;
1480 return 0;
1481 }
1482
1483 static int do_ioctl(struct inode * inode, struct file *filp,
1484 u_int cmd, u_long arg)
1485 {
1486 struct apm_user * as;
1487
1488 as = filp->private_data;
1489 if (check_apm_user(as, "ioctl"))
1490 return -EIO;
1491 if ((!as->suser) || (!as->writer))
1492 return -EPERM;
1493 switch (cmd) {
1494 case APM_IOC_STANDBY:
1495 if (as->standbys_read > 0) {
1496 as->standbys_read--;
1497 as->standbys_pending--;
1498 standbys_pending--;
1499 } else
1500 queue_event(APM_USER_STANDBY, as);
1501 if (standbys_pending <= 0)
1502 standby();
1503 break;
1504 case APM_IOC_SUSPEND:
1505 if (as->suspends_read > 0) {
1506 as->suspends_read--;
1507 as->suspends_pending--;
1508 suspends_pending--;
1509 } else
1510 queue_event(APM_USER_SUSPEND, as);
1511 if (suspends_pending <= 0) {
1512 return suspend(1);
1513 } else {
1514 as->suspend_wait = 1;
1515 wait_event_interruptible(apm_suspend_waitqueue,
1516 as->suspend_wait == 0);
1517 return as->suspend_result;
1518 }
1519 break;
1520 default:
1521 return -EINVAL;
1522 }
1523 return 0;
1524 }
1525
1526 static int do_release(struct inode * inode, struct file * filp)
1527 {
1528 struct apm_user * as;
1529
1530 as = filp->private_data;
1531 if (check_apm_user(as, "release"))
1532 return 0;
1533 filp->private_data = NULL;
1534 if (as->standbys_pending > 0) {
1535 standbys_pending -= as->standbys_pending;
1536 if (standbys_pending <= 0)
1537 standby();
1538 }
1539 if (as->suspends_pending > 0) {
1540 suspends_pending -= as->suspends_pending;
1541 if (suspends_pending <= 0)
1542 (void) suspend(1);
1543 }
1544 spin_lock(&user_list_lock);
1545 if (user_list == as)
1546 user_list = as->next;
1547 else {
1548 struct apm_user * as1;
1549
1550 for (as1 = user_list;
1551 (as1 != NULL) && (as1->next != as);
1552 as1 = as1->next)
1553 ;
1554 if (as1 == NULL)
1555 printk(KERN_ERR "apm: filp not in user list\n");
1556 else
1557 as1->next = as->next;
1558 }
1559 spin_unlock(&user_list_lock);
1560 kfree(as);
1561 return 0;
1562 }
1563
1564 static int do_open(struct inode * inode, struct file * filp)
1565 {
1566 struct apm_user * as;
1567
1568 as = kmalloc(sizeof(*as), GFP_KERNEL);
1569 if (as == NULL) {
1570 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1571 sizeof(*as));
1572 return -ENOMEM;
1573 }
1574 as->magic = APM_BIOS_MAGIC;
1575 as->event_tail = as->event_head = 0;
1576 as->suspends_pending = as->standbys_pending = 0;
1577 as->suspends_read = as->standbys_read = 0;
1578 /*
1579 * XXX - this is a tiny bit broken, when we consider BSD
1580 * process accounting. If the device is opened by root, we
1581 * instantly flag that we used superuser privs. Who knows,
1582 * we might close the device immediately without doing a
1583 * privileged operation -- cevans
1584 */
1585 as->suser = capable(CAP_SYS_ADMIN);
1586 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1587 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1588 spin_lock(&user_list_lock);
1589 as->next = user_list;
1590 user_list = as;
1591 spin_unlock(&user_list_lock);
1592 filp->private_data = as;
1593 return 0;
1594 }
1595
1596 static int proc_apm_show(struct seq_file *m, void *v)
1597 {
1598 unsigned short bx;
1599 unsigned short cx;
1600 unsigned short dx;
1601 int error;
1602 unsigned short ac_line_status = 0xff;
1603 unsigned short battery_status = 0xff;
1604 unsigned short battery_flag = 0xff;
1605 int percentage = -1;
1606 int time_units = -1;
1607 char *units = "?";
1608
1609 if ((num_online_cpus() == 1) &&
1610 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1611 ac_line_status = (bx >> 8) & 0xff;
1612 battery_status = bx & 0xff;
1613 if ((cx & 0xff) != 0xff)
1614 percentage = cx & 0xff;
1615
1616 if (apm_info.connection_version > 0x100) {
1617 battery_flag = (cx >> 8) & 0xff;
1618 if (dx != 0xffff) {
1619 units = (dx & 0x8000) ? "min" : "sec";
1620 time_units = dx & 0x7fff;
1621 }
1622 }
1623 }
1624 /* Arguments, with symbols from linux/apm_bios.h. Information is
1625 from the Get Power Status (0x0a) call unless otherwise noted.
1626
1627 0) Linux driver version (this will change if format changes)
1628 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1629 2) APM flags from APM Installation Check (0x00):
1630 bit 0: APM_16_BIT_SUPPORT
1631 bit 1: APM_32_BIT_SUPPORT
1632 bit 2: APM_IDLE_SLOWS_CLOCK
1633 bit 3: APM_BIOS_DISABLED
1634 bit 4: APM_BIOS_DISENGAGED
1635 3) AC line status
1636 0x00: Off-line
1637 0x01: On-line
1638 0x02: On backup power (BIOS >= 1.1 only)
1639 0xff: Unknown
1640 4) Battery status
1641 0x00: High
1642 0x01: Low
1643 0x02: Critical
1644 0x03: Charging
1645 0x04: Selected battery not present (BIOS >= 1.2 only)
1646 0xff: Unknown
1647 5) Battery flag
1648 bit 0: High
1649 bit 1: Low
1650 bit 2: Critical
1651 bit 3: Charging
1652 bit 7: No system battery
1653 0xff: Unknown
1654 6) Remaining battery life (percentage of charge):
1655 0-100: valid
1656 -1: Unknown
1657 7) Remaining battery life (time units):
1658 Number of remaining minutes or seconds
1659 -1: Unknown
1660 8) min = minutes; sec = seconds */
1661
1662 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1663 driver_version,
1664 (apm_info.bios.version >> 8) & 0xff,
1665 apm_info.bios.version & 0xff,
1666 apm_info.bios.flags,
1667 ac_line_status,
1668 battery_status,
1669 battery_flag,
1670 percentage,
1671 time_units,
1672 units);
1673 return 0;
1674 }
1675
1676 static int proc_apm_open(struct inode *inode, struct file *file)
1677 {
1678 return single_open(file, proc_apm_show, NULL);
1679 }
1680
1681 static const struct file_operations apm_file_ops = {
1682 .owner = THIS_MODULE,
1683 .open = proc_apm_open,
1684 .read = seq_read,
1685 .llseek = seq_lseek,
1686 .release = single_release,
1687 };
1688
1689 static int apm(void *unused)
1690 {
1691 unsigned short bx;
1692 unsigned short cx;
1693 unsigned short dx;
1694 int error;
1695 char * power_stat;
1696 char * bat_stat;
1697
1698 #ifdef CONFIG_SMP
1699 /* 2002/08/01 - WT
1700 * This is to avoid random crashes at boot time during initialization
1701 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1702 * Some bioses don't like being called from CPU != 0.
1703 * Method suggested by Ingo Molnar.
1704 */
1705 set_cpus_allowed(current, cpumask_of_cpu(0));
1706 BUG_ON(smp_processor_id() != 0);
1707 #endif
1708
1709 if (apm_info.connection_version == 0) {
1710 apm_info.connection_version = apm_info.bios.version;
1711 if (apm_info.connection_version > 0x100) {
1712 /*
1713 * We only support BIOSs up to version 1.2
1714 */
1715 if (apm_info.connection_version > 0x0102)
1716 apm_info.connection_version = 0x0102;
1717 error = apm_driver_version(&apm_info.connection_version);
1718 if (error != APM_SUCCESS) {
1719 apm_error("driver version", error);
1720 /* Fall back to an APM 1.0 connection. */
1721 apm_info.connection_version = 0x100;
1722 }
1723 }
1724 }
1725
1726 if (debug)
1727 printk(KERN_INFO "apm: Connection version %d.%d\n",
1728 (apm_info.connection_version >> 8) & 0xff,
1729 apm_info.connection_version & 0xff);
1730
1731 #ifdef CONFIG_APM_DO_ENABLE
1732 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1733 /*
1734 * This call causes my NEC UltraLite Versa 33/C to hang if it
1735 * is booted with PM disabled but not in the docking station.
1736 * Unfortunate ...
1737 */
1738 error = apm_enable_power_management(1);
1739 if (error) {
1740 apm_error("enable power management", error);
1741 return -1;
1742 }
1743 }
1744 #endif
1745
1746 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1747 && (apm_info.connection_version > 0x0100)) {
1748 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1749 if (error) {
1750 apm_error("engage power management", error);
1751 return -1;
1752 }
1753 }
1754
1755 if (debug && (num_online_cpus() == 1 || smp )) {
1756 error = apm_get_power_status(&bx, &cx, &dx);
1757 if (error)
1758 printk(KERN_INFO "apm: power status not available\n");
1759 else {
1760 switch ((bx >> 8) & 0xff) {
1761 case 0: power_stat = "off line"; break;
1762 case 1: power_stat = "on line"; break;
1763 case 2: power_stat = "on backup power"; break;
1764 default: power_stat = "unknown"; break;
1765 }
1766 switch (bx & 0xff) {
1767 case 0: bat_stat = "high"; break;
1768 case 1: bat_stat = "low"; break;
1769 case 2: bat_stat = "critical"; break;
1770 case 3: bat_stat = "charging"; break;
1771 default: bat_stat = "unknown"; break;
1772 }
1773 printk(KERN_INFO
1774 "apm: AC %s, battery status %s, battery life ",
1775 power_stat, bat_stat);
1776 if ((cx & 0xff) == 0xff)
1777 printk("unknown\n");
1778 else
1779 printk("%d%%\n", cx & 0xff);
1780 if (apm_info.connection_version > 0x100) {
1781 printk(KERN_INFO
1782 "apm: battery flag 0x%02x, battery life ",
1783 (cx >> 8) & 0xff);
1784 if (dx == 0xffff)
1785 printk("unknown\n");
1786 else
1787 printk("%d %s\n", dx & 0x7fff,
1788 (dx & 0x8000) ?
1789 "minutes" : "seconds");
1790 }
1791 }
1792 }
1793
1794 /* Install our power off handler.. */
1795 if (power_off)
1796 pm_power_off = apm_power_off;
1797
1798 if (num_online_cpus() == 1 || smp) {
1799 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1800 console_blank_hook = apm_console_blank;
1801 #endif
1802 apm_mainloop();
1803 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1804 console_blank_hook = NULL;
1805 #endif
1806 }
1807
1808 return 0;
1809 }
1810
1811 #ifndef MODULE
1812 static int __init apm_setup(char *str)
1813 {
1814 int invert;
1815
1816 while ((str != NULL) && (*str != '\0')) {
1817 if (strncmp(str, "off", 3) == 0)
1818 apm_disabled = 1;
1819 if (strncmp(str, "on", 2) == 0)
1820 apm_disabled = 0;
1821 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1822 (strncmp(str, "bounce_interval=", 16) == 0))
1823 bounce_interval = simple_strtol(str + 16, NULL, 0);
1824 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1825 (strncmp(str, "idle_threshold=", 15) == 0))
1826 idle_threshold = simple_strtol(str + 15, NULL, 0);
1827 if ((strncmp(str, "idle-period=", 12) == 0) ||
1828 (strncmp(str, "idle_period=", 12) == 0))
1829 idle_period = simple_strtol(str + 12, NULL, 0);
1830 invert = (strncmp(str, "no-", 3) == 0) ||
1831 (strncmp(str, "no_", 3) == 0);
1832 if (invert)
1833 str += 3;
1834 if (strncmp(str, "debug", 5) == 0)
1835 debug = !invert;
1836 if ((strncmp(str, "power-off", 9) == 0) ||
1837 (strncmp(str, "power_off", 9) == 0))
1838 power_off = !invert;
1839 if (strncmp(str, "smp", 3) == 0)
1840 {
1841 smp = !invert;
1842 idle_threshold = 100;
1843 }
1844 if ((strncmp(str, "allow-ints", 10) == 0) ||
1845 (strncmp(str, "allow_ints", 10) == 0))
1846 apm_info.allow_ints = !invert;
1847 if ((strncmp(str, "broken-psr", 10) == 0) ||
1848 (strncmp(str, "broken_psr", 10) == 0))
1849 apm_info.get_power_status_broken = !invert;
1850 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1851 (strncmp(str, "realmode_power_off", 18) == 0))
1852 apm_info.realmode_power_off = !invert;
1853 str = strchr(str, ',');
1854 if (str != NULL)
1855 str += strspn(str, ", \t");
1856 }
1857 return 1;
1858 }
1859
1860 __setup("apm=", apm_setup);
1861 #endif
1862
1863 static const struct file_operations apm_bios_fops = {
1864 .owner = THIS_MODULE,
1865 .read = do_read,
1866 .poll = do_poll,
1867 .ioctl = do_ioctl,
1868 .open = do_open,
1869 .release = do_release,
1870 };
1871
1872 static struct miscdevice apm_device = {
1873 APM_MINOR_DEV,
1874 "apm_bios",
1875 &apm_bios_fops
1876 };
1877
1878
1879 /* Simple "print if true" callback */
1880 static int __init print_if_true(struct dmi_system_id *d)
1881 {
1882 printk("%s\n", d->ident);
1883 return 0;
1884 }
1885
1886 /*
1887 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1888 * disabled before the suspend. Linux used to get terribly confused by that.
1889 */
1890 static int __init broken_ps2_resume(struct dmi_system_id *d)
1891 {
1892 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug workaround hopefully not needed.\n", d->ident);
1893 return 0;
1894 }
1895
1896 /* Some bioses have a broken protected mode poweroff and need to use realmode */
1897 static int __init set_realmode_power_off(struct dmi_system_id *d)
1898 {
1899 if (apm_info.realmode_power_off == 0) {
1900 apm_info.realmode_power_off = 1;
1901 printk(KERN_INFO "%s bios detected. Using realmode poweroff only.\n", d->ident);
1902 }
1903 return 0;
1904 }
1905
1906 /* Some laptops require interrupts to be enabled during APM calls */
1907 static int __init set_apm_ints(struct dmi_system_id *d)
1908 {
1909 if (apm_info.allow_ints == 0) {
1910 apm_info.allow_ints = 1;
1911 printk(KERN_INFO "%s machine detected. Enabling interrupts during APM calls.\n", d->ident);
1912 }
1913 return 0;
1914 }
1915
1916 /* Some APM bioses corrupt memory or just plain do not work */
1917 static int __init apm_is_horked(struct dmi_system_id *d)
1918 {
1919 if (apm_info.disabled == 0) {
1920 apm_info.disabled = 1;
1921 printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
1922 }
1923 return 0;
1924 }
1925
1926 static int __init apm_is_horked_d850md(struct dmi_system_id *d)
1927 {
1928 if (apm_info.disabled == 0) {
1929 apm_info.disabled = 1;
1930 printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
1931 printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n");
1932 printk(KERN_INFO "download from support.intel.com \n");
1933 }
1934 return 0;
1935 }
1936
1937 /* Some APM bioses hang on APM idle calls */
1938 static int __init apm_likes_to_melt(struct dmi_system_id *d)
1939 {
1940 if (apm_info.forbid_idle == 0) {
1941 apm_info.forbid_idle = 1;
1942 printk(KERN_INFO "%s machine detected. Disabling APM idle calls.\n", d->ident);
1943 }
1944 return 0;
1945 }
1946
1947 /*
1948 * Check for clue free BIOS implementations who use
1949 * the following QA technique
1950 *
1951 * [ Write BIOS Code ]<------
1952 * | ^
1953 * < Does it Compile >----N--
1954 * |Y ^
1955 * < Does it Boot Win98 >-N--
1956 * |Y
1957 * [Ship It]
1958 *
1959 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
1960 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
1961 */
1962 static int __init broken_apm_power(struct dmi_system_id *d)
1963 {
1964 apm_info.get_power_status_broken = 1;
1965 printk(KERN_WARNING "BIOS strings suggest APM bugs, disabling power status reporting.\n");
1966 return 0;
1967 }
1968
1969 /*
1970 * This bios swaps the APM minute reporting bytes over (Many sony laptops
1971 * have this problem).
1972 */
1973 static int __init swab_apm_power_in_minutes(struct dmi_system_id *d)
1974 {
1975 apm_info.get_power_status_swabinminutes = 1;
1976 printk(KERN_WARNING "BIOS strings suggest APM reports battery life in minutes and wrong byte order.\n");
1977 return 0;
1978 }
1979
1980 static struct dmi_system_id __initdata apm_dmi_table[] = {
1981 {
1982 print_if_true,
1983 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
1984 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
1985 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
1986 },
1987 { /* Handle problems with APM on the C600 */
1988 broken_ps2_resume, "Dell Latitude C600",
1989 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
1990 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
1991 },
1992 { /* Allow interrupts during suspend on Dell Latitude laptops*/
1993 set_apm_ints, "Dell Latitude",
1994 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
1995 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
1996 },
1997 { /* APM crashes */
1998 apm_is_horked, "Dell Inspiron 2500",
1999 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2000 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2001 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
2002 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2003 },
2004 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2005 set_apm_ints, "Dell Inspiron", {
2006 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2007 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2008 },
2009 { /* Handle problems with APM on Inspiron 5000e */
2010 broken_apm_power, "Dell Inspiron 5000e",
2011 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2012 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2013 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2014 },
2015 { /* Handle problems with APM on Inspiron 2500 */
2016 broken_apm_power, "Dell Inspiron 2500",
2017 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2018 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2019 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2020 },
2021 { /* APM crashes */
2022 apm_is_horked, "Dell Dimension 4100",
2023 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2024 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2025 DMI_MATCH(DMI_BIOS_VENDOR,"Intel Corp."),
2026 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2027 },
2028 { /* Allow interrupts during suspend on Compaq Laptops*/
2029 set_apm_ints, "Compaq 12XL125",
2030 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2031 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2032 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2033 DMI_MATCH(DMI_BIOS_VERSION,"4.06"), },
2034 },
2035 { /* Allow interrupts during APM or the clock goes slow */
2036 set_apm_ints, "ASUSTeK",
2037 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2038 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2039 },
2040 { /* APM blows on shutdown */
2041 apm_is_horked, "ABIT KX7-333[R]",
2042 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2043 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2044 },
2045 { /* APM crashes */
2046 apm_is_horked, "Trigem Delhi3",
2047 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2048 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2049 },
2050 { /* APM crashes */
2051 apm_is_horked, "Fujitsu-Siemens",
2052 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2053 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2054 },
2055 { /* APM crashes */
2056 apm_is_horked_d850md, "Intel D850MD",
2057 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2058 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2059 },
2060 { /* APM crashes */
2061 apm_is_horked, "Intel D810EMO",
2062 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2063 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2064 },
2065 { /* APM crashes */
2066 apm_is_horked, "Dell XPS-Z",
2067 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2068 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2069 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2070 },
2071 { /* APM crashes */
2072 apm_is_horked, "Sharp PC-PJ/AX",
2073 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2074 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2075 DMI_MATCH(DMI_BIOS_VENDOR,"SystemSoft"),
2076 DMI_MATCH(DMI_BIOS_VERSION,"Version R2.08"), },
2077 },
2078 { /* APM crashes */
2079 apm_is_horked, "Dell Inspiron 2500",
2080 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2081 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2082 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
2083 DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
2084 },
2085 { /* APM idle hangs */
2086 apm_likes_to_melt, "Jabil AMD",
2087 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2088 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2089 },
2090 { /* APM idle hangs */
2091 apm_likes_to_melt, "AMI Bios",
2092 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2093 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2094 },
2095 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2096 swab_apm_power_in_minutes, "Sony VAIO",
2097 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2098 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2099 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2100 },
2101 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2102 swab_apm_power_in_minutes, "Sony VAIO",
2103 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2104 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2105 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2106 },
2107 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2108 swab_apm_power_in_minutes, "Sony VAIO",
2109 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2110 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2111 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2112 },
2113 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2114 swab_apm_power_in_minutes, "Sony VAIO",
2115 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2116 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2117 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2118 },
2119 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2120 swab_apm_power_in_minutes, "Sony VAIO",
2121 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2122 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2123 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2124 },
2125 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2126 swab_apm_power_in_minutes, "Sony VAIO",
2127 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2128 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2129 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2130 },
2131 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2132 swab_apm_power_in_minutes, "Sony VAIO",
2133 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2134 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2135 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2136 },
2137 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2138 swab_apm_power_in_minutes, "Sony VAIO",
2139 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2140 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2141 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2142 },
2143 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2144 swab_apm_power_in_minutes, "Sony VAIO",
2145 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2146 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2147 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2148 },
2149 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2150 swab_apm_power_in_minutes, "Sony VAIO",
2151 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2152 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2153 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2154 },
2155
2156 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2157 swab_apm_power_in_minutes, "Sony VAIO",
2158 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2159 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2160 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2161 },
2162 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2163 swab_apm_power_in_minutes, "Sony VAIO",
2164 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2165 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2166 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2167 },
2168 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2169 swab_apm_power_in_minutes, "Sony VAIO",
2170 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2171 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2172 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2173 },
2174 { /* broken PM poweroff bios */
2175 set_realmode_power_off, "Award Software v4.60 PGMA",
2176 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2177 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2178 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2179 },
2180
2181 /* Generic per vendor APM settings */
2182
2183 { /* Allow interrupts during suspend on IBM laptops */
2184 set_apm_ints, "IBM",
2185 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2186 },
2187
2188 { }
2189 };
2190
2191 /*
2192 * Just start the APM thread. We do NOT want to do APM BIOS
2193 * calls from anything but the APM thread, if for no other reason
2194 * than the fact that we don't trust the APM BIOS. This way,
2195 * most common APM BIOS problems that lead to protection errors
2196 * etc will have at least some level of being contained...
2197 *
2198 * In short, if something bad happens, at least we have a choice
2199 * of just killing the apm thread..
2200 */
2201 static int __init apm_init(void)
2202 {
2203 struct proc_dir_entry *apm_proc;
2204 struct desc_struct *gdt;
2205 int err;
2206
2207 dmi_check_system(apm_dmi_table);
2208
2209 if (apm_info.bios.version == 0 || paravirt_enabled()) {
2210 printk(KERN_INFO "apm: BIOS not found.\n");
2211 return -ENODEV;
2212 }
2213 printk(KERN_INFO
2214 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2215 ((apm_info.bios.version >> 8) & 0xff),
2216 (apm_info.bios.version & 0xff),
2217 apm_info.bios.flags,
2218 driver_version);
2219 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2220 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2221 return -ENODEV;
2222 }
2223
2224 if (allow_ints)
2225 apm_info.allow_ints = 1;
2226 if (broken_psr)
2227 apm_info.get_power_status_broken = 1;
2228 if (realmode_power_off)
2229 apm_info.realmode_power_off = 1;
2230 /* User can override, but default is to trust DMI */
2231 if (apm_disabled != -1)
2232 apm_info.disabled = apm_disabled;
2233
2234 /*
2235 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2236 * but is reportedly a 1.0 BIOS.
2237 */
2238 if (apm_info.bios.version == 0x001)
2239 apm_info.bios.version = 0x100;
2240
2241 /* BIOS < 1.2 doesn't set cseg_16_len */
2242 if (apm_info.bios.version < 0x102)
2243 apm_info.bios.cseg_16_len = 0; /* 64k */
2244
2245 if (debug) {
2246 printk(KERN_INFO "apm: entry %x:%lx cseg16 %x dseg %x",
2247 apm_info.bios.cseg, apm_info.bios.offset,
2248 apm_info.bios.cseg_16, apm_info.bios.dseg);
2249 if (apm_info.bios.version > 0x100)
2250 printk(" cseg len %x, dseg len %x",
2251 apm_info.bios.cseg_len,
2252 apm_info.bios.dseg_len);
2253 if (apm_info.bios.version > 0x101)
2254 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2255 printk("\n");
2256 }
2257
2258 if (apm_info.disabled) {
2259 printk(KERN_NOTICE "apm: disabled on user request.\n");
2260 return -ENODEV;
2261 }
2262 if ((num_online_cpus() > 1) && !power_off && !smp) {
2263 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2264 apm_info.disabled = 1;
2265 return -ENODEV;
2266 }
2267 if (PM_IS_ACTIVE()) {
2268 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2269 apm_info.disabled = 1;
2270 return -ENODEV;
2271 }
2272 #ifdef CONFIG_PM_LEGACY
2273 pm_active = 1;
2274 #endif
2275
2276 /*
2277 * Set up a segment that references the real mode segment 0x40
2278 * that extends up to the end of page zero (that we have reserved).
2279 * This is for buggy BIOS's that refer to (real mode) segment 0x40
2280 * even though they are called in protected mode.
2281 */
2282 set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
2283 _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
2284
2285 /*
2286 * Set up the long jump entry point to the APM BIOS, which is called
2287 * from inline assembly.
2288 */
2289 apm_bios_entry.offset = apm_info.bios.offset;
2290 apm_bios_entry.segment = APM_CS;
2291
2292 /*
2293 * The APM 1.1 BIOS is supposed to provide limit information that it
2294 * recognizes. Many machines do this correctly, but many others do
2295 * not restrict themselves to their claimed limit. When this happens,
2296 * they will cause a segmentation violation in the kernel at boot time.
2297 * Most BIOS's, however, will respect a 64k limit, so we use that.
2298 *
2299 * Note we only set APM segments on CPU zero, since we pin the APM
2300 * code to that CPU.
2301 */
2302 gdt = get_cpu_gdt_table(0);
2303 set_base(gdt[APM_CS >> 3],
2304 __va((unsigned long)apm_info.bios.cseg << 4));
2305 set_base(gdt[APM_CS_16 >> 3],
2306 __va((unsigned long)apm_info.bios.cseg_16 << 4));
2307 set_base(gdt[APM_DS >> 3],
2308 __va((unsigned long)apm_info.bios.dseg << 4));
2309
2310 apm_proc = create_proc_entry("apm", 0, NULL);
2311 if (apm_proc)
2312 apm_proc->proc_fops = &apm_file_ops;
2313
2314 kapmd_task = kthread_create(apm, NULL, "kapmd");
2315 if (IS_ERR(kapmd_task)) {
2316 printk(KERN_ERR "apm: disabled - Unable to start kernel "
2317 "thread.\n");
2318 err = PTR_ERR(kapmd_task);
2319 kapmd_task = NULL;
2320 remove_proc_entry("apm", NULL);
2321 return err;
2322 }
2323 kapmd_task->flags |= PF_NOFREEZE;
2324 wake_up_process(kapmd_task);
2325
2326 if (num_online_cpus() > 1 && !smp ) {
2327 printk(KERN_NOTICE
2328 "apm: disabled - APM is not SMP safe (power off active).\n");
2329 return 0;
2330 }
2331
2332 /*
2333 * Note we don't actually care if the misc_device cannot be registered.
2334 * this driver can do its job without it, even if userspace can't
2335 * control it. just log the error
2336 */
2337 if (misc_register(&apm_device))
2338 printk(KERN_WARNING "apm: Could not register misc device.\n");
2339
2340 if (HZ != 100)
2341 idle_period = (idle_period * HZ) / 100;
2342 if (idle_threshold < 100) {
2343 original_pm_idle = pm_idle;
2344 pm_idle = apm_cpu_idle;
2345 set_pm_idle = 1;
2346 }
2347
2348 return 0;
2349 }
2350
2351 static void __exit apm_exit(void)
2352 {
2353 int error;
2354
2355 if (set_pm_idle) {
2356 pm_idle = original_pm_idle;
2357 /*
2358 * We are about to unload the current idle thread pm callback
2359 * (pm_idle), Wait for all processors to update cached/local
2360 * copies of pm_idle before proceeding.
2361 */
2362 cpu_idle_wait();
2363 }
2364 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2365 && (apm_info.connection_version > 0x0100)) {
2366 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2367 if (error)
2368 apm_error("disengage power management", error);
2369 }
2370 misc_deregister(&apm_device);
2371 remove_proc_entry("apm", NULL);
2372 if (power_off)
2373 pm_power_off = NULL;
2374 if (kapmd_task) {
2375 kthread_stop(kapmd_task);
2376 kapmd_task = NULL;
2377 }
2378 #ifdef CONFIG_PM_LEGACY
2379 pm_active = 0;
2380 #endif
2381 }
2382
2383 module_init(apm_init);
2384 module_exit(apm_exit);
2385
2386 MODULE_AUTHOR("Stephen Rothwell");
2387 MODULE_DESCRIPTION("Advanced Power Management");
2388 MODULE_LICENSE("GPL");
2389 module_param(debug, bool, 0644);
2390 MODULE_PARM_DESC(debug, "Enable debug mode");
2391 module_param(power_off, bool, 0444);
2392 MODULE_PARM_DESC(power_off, "Enable power off");
2393 module_param(bounce_interval, int, 0444);
2394 MODULE_PARM_DESC(bounce_interval,
2395 "Set the number of ticks to ignore suspend bounces");
2396 module_param(allow_ints, bool, 0444);
2397 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2398 module_param(broken_psr, bool, 0444);
2399 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2400 module_param(realmode_power_off, bool, 0444);
2401 MODULE_PARM_DESC(realmode_power_off,
2402 "Switch to real mode before powering off");
2403 module_param(idle_threshold, int, 0444);
2404 MODULE_PARM_DESC(idle_threshold,
2405 "System idle percentage above which to make APM BIOS idle calls");
2406 module_param(idle_period, int, 0444);
2407 MODULE_PARM_DESC(idle_period,
2408 "Period (in sec/100) over which to caculate the idle percentage");
2409 module_param(smp, bool, 0444);
2410 MODULE_PARM_DESC(smp,
2411 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2412 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
kernel source for telekom puls (alcatel/mediatek)