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x86, ioapic: Fix potential resume deadlock
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / x86 / kernel / apm_32.c
blob0e4f24c2a746f11b21ec534db5180c50e0d69cbd
1 /* -*- linux-c -*-
2 * APM BIOS driver for Linux
3 * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
4 *
5 * Initial development of this driver was funded by NEC Australia P/L
6 * and NEC Corporation
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2, or (at your option) any
11 * later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * October 1995, Rik Faith (faith@cs.unc.edu):
19 * Minor enhancements and updates (to the patch set) for 1.3.x
20 * Documentation
21 * January 1996, Rik Faith (faith@cs.unc.edu):
22 * Make /proc/apm easy to format (bump driver version)
23 * March 1996, Rik Faith (faith@cs.unc.edu):
24 * Prohibit APM BIOS calls unless apm_enabled.
25 * (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>)
26 * April 1996, Stephen Rothwell (sfr@canb.auug.org.au)
27 * Version 1.0 and 1.1
28 * May 1996, Version 1.2
29 * Feb 1998, Version 1.3
30 * Feb 1998, Version 1.4
31 * Aug 1998, Version 1.5
32 * Sep 1998, Version 1.6
33 * Nov 1998, Version 1.7
34 * Jan 1999, Version 1.8
35 * Jan 1999, Version 1.9
36 * Oct 1999, Version 1.10
37 * Nov 1999, Version 1.11
38 * Jan 2000, Version 1.12
39 * Feb 2000, Version 1.13
40 * Nov 2000, Version 1.14
41 * Oct 2001, Version 1.15
42 * Jan 2002, Version 1.16
43 * Oct 2002, Version 1.16ac
44 *
45 * History:
46 * 0.6b: first version in official kernel, Linux 1.3.46
47 * 0.7: changed /proc/apm format, Linux 1.3.58
48 * 0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59
49 * 0.9: only call bios if bios is present, Linux 1.3.72
50 * 1.0: use fixed device number, consolidate /proc/apm into this file,
51 * Linux 1.3.85
52 * 1.1: support user-space standby and suspend, power off after system
53 * halted, Linux 1.3.98
54 * 1.2: When resetting RTC after resume, take care so that the time
55 * is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
56 * <jtoth@princeton.edu>); improve interaction between
57 * screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
58 * 1.2a:Simple change to stop mysterious bug reports with SMP also added
59 * levels to the printk calls. APM is not defined for SMP machines.
60 * The new replacement for it is, but Linux doesn't yet support this.
61 * Alan Cox Linux 2.1.55
62 * 1.3: Set up a valid data descriptor 0x40 for buggy BIOS's
63 * 1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by
64 * Dean Gaudet <dgaudet@arctic.org>.
65 * C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87
66 * 1.5: Fix segment register reloading (in case of bad segments saved
67 * across BIOS call).
68 * Stephen Rothwell
69 * 1.6: Cope with complier/assembler differences.
70 * Only try to turn off the first display device.
71 * Fix OOPS at power off with no APM BIOS by Jan Echternach
72 * <echter@informatik.uni-rostock.de>
73 * Stephen Rothwell
74 * 1.7: Modify driver's cached copy of the disabled/disengaged flags
75 * to reflect current state of APM BIOS.
76 * Chris Rankin <rankinc@bellsouth.net>
77 * Reset interrupt 0 timer to 100Hz after suspend
78 * Chad Miller <cmiller@surfsouth.com>
79 * Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
80 * Richard Gooch <rgooch@atnf.csiro.au>
81 * Allow boot time disabling of APM
82 * Make boot messages far less verbose by default
83 * Make asm safer
84 * Stephen Rothwell
85 * 1.8: Add CONFIG_APM_RTC_IS_GMT
86 * Richard Gooch <rgooch@atnf.csiro.au>
87 * change APM_NOINTS to CONFIG_APM_ALLOW_INTS
88 * remove dependency on CONFIG_PROC_FS
89 * Stephen Rothwell
90 * 1.9: Fix small typo. <laslo@wodip.opole.pl>
91 * Try to cope with BIOS's that need to have all display
92 * devices blanked and not just the first one.
93 * Ross Paterson <ross@soi.city.ac.uk>
94 * Fix segment limit setting it has always been wrong as
95 * the segments needed to have byte granularity.
96 * Mark a few things __init.
97 * Add hack to allow power off of SMP systems by popular request.
98 * Use CONFIG_SMP instead of __SMP__
99 * Ignore BOUNCES for three seconds.
100 * Stephen Rothwell
101 * 1.10: Fix for Thinkpad return code.
102 * Merge 2.2 and 2.3 drivers.
103 * Remove APM dependencies in arch/i386/kernel/process.c
104 * Remove APM dependencies in drivers/char/sysrq.c
105 * Reset time across standby.
106 * Allow more inititialisation on SMP.
107 * Remove CONFIG_APM_POWER_OFF and make it boot time
108 * configurable (default on).
109 * Make debug only a boot time parameter (remove APM_DEBUG).
110 * Try to blank all devices on any error.
111 * 1.11: Remove APM dependencies in drivers/char/console.c
112 * Check nr_running to detect if we are idle (from
113 * Borislav Deianov <borislav@lix.polytechnique.fr>)
114 * Fix for bioses that don't zero the top part of the
115 * entrypoint offset (Mario Sitta <sitta@al.unipmn.it>)
116 * (reported by Panos Katsaloulis <teras@writeme.com>).
117 * Real mode power off patch (Walter Hofmann
118 * <Walter.Hofmann@physik.stud.uni-erlangen.de>).
119 * 1.12: Remove CONFIG_SMP as the compiler will optimize
120 * the code away anyway (smp_num_cpus == 1 in UP)
121 * noted by Artur Skawina <skawina@geocities.com>.
122 * Make power off under SMP work again.
123 * Fix thinko with initial engaging of BIOS.
124 * Make sure power off only happens on CPU 0
125 * (Paul "Rusty" Russell <rusty@rustcorp.com.au>).
126 * Do error notification to user mode if BIOS calls fail.
127 * Move entrypoint offset fix to ...boot/setup.S
128 * where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>).
129 * Remove smp-power-off. SMP users must now specify
130 * "apm=power-off" on the kernel command line. Suggested
131 * by Jim Avera <jima@hal.com>, modified by Alan Cox
132 * <alan@lxorguk.ukuu.org.uk>.
133 * Register the /proc/apm entry even on SMP so that
134 * scripts that check for it before doing power off
135 * work (Jim Avera <jima@hal.com>).
136 * 1.13: Changes for new pm_ interfaces (Andy Henroid
137 * <andy_henroid@yahoo.com>).
138 * Modularize the code.
139 * Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS
140 * is now the way life works).
141 * Fix thinko in suspend() (wrong return).
142 * Notify drivers on critical suspend.
143 * Make kapmd absorb more idle time (Pavel Machek <pavel@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
231 #include <asm/system.h>
232 #include <asm/uaccess.h>
233 #include <asm/desc.h>
234 #include <asm/i8253.h>
235 #include <asm/olpc.h>
236 #include <asm/paravirt.h>
237 #include <asm/reboot.h>
238
239 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
240 extern int (*console_blank_hook)(int);
241 #endif
242
243 /*
244 * The apm_bios device is one of the misc char devices.
245 * This is its minor number.
246 */
247 #define APM_MINOR_DEV 134
248
249 /*
250 * See Documentation/Config.help for the configuration options.
251 *
252 * Various options can be changed at boot time as follows:
253 * (We allow underscores for compatibility with the modules code)
254 * apm=on/off enable/disable APM
255 * [no-]allow[-_]ints allow interrupts during BIOS calls
256 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
257 * [no-]realmode[-_]power[-_]off switch to real mode before
258 * powering off
259 * [no-]debug log some debugging messages
260 * [no-]power[-_]off power off on shutdown
261 * [no-]smp Use apm even on an SMP box
262 * bounce[-_]interval=<n> number of ticks to ignore suspend
263 * bounces
264 * idle[-_]threshold=<n> System idle percentage above which to
265 * make APM BIOS idle calls. Set it to
266 * 100 to disable.
267 * idle[-_]period=<n> Period (in 1/100s of a second) over
268 * which the idle percentage is
269 * calculated.
270 */
271
272 /* KNOWN PROBLEM MACHINES:
273 *
274 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
275 * [Confirmed by TI representative]
276 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
277 * [Confirmed by BIOS disassembly]
278 * [This may work now ...]
279 * P: Toshiba 1950S: battery life information only gets updated after resume
280 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
281 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
282 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
283 * Neale Banks <neale@lowendale.com.au> December 2000
284 *
285 * Legend: U = unusable with APM patches
286 * P = partially usable with APM patches
287 */
288
289 /*
290 * Define as 1 to make the driver always call the APM BIOS busy
291 * routine even if the clock was not reported as slowed by the
292 * idle routine. Otherwise, define as 0.
293 */
294 #define ALWAYS_CALL_BUSY 1
295
296 /*
297 * Define to make the APM BIOS calls zero all data segment registers (so
298 * that an incorrect BIOS implementation will cause a kernel panic if it
299 * tries to write to arbitrary memory).
300 */
301 #define APM_ZERO_SEGS
302
303 #include <asm/apm.h>
304
305 /*
306 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
307 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
308 * David Chen <chen@ctpa04.mit.edu>
309 */
310 #undef INIT_TIMER_AFTER_SUSPEND
311
312 #ifdef INIT_TIMER_AFTER_SUSPEND
313 #include <linux/timex.h>
314 #include <asm/io.h>
315 #include <linux/delay.h>
316 #endif
317
318 /*
319 * Need to poll the APM BIOS every second
320 */
321 #define APM_CHECK_TIMEOUT (HZ)
322
323 /*
324 * Ignore suspend events for this amount of time after a resume
325 */
326 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
327
328 /*
329 * Maximum number of events stored
330 */
331 #define APM_MAX_EVENTS 20
332
333 /*
334 * The per-file APM data
335 */
336 struct apm_user {
337 int magic;
338 struct apm_user *next;
339 unsigned int suser: 1;
340 unsigned int writer: 1;
341 unsigned int reader: 1;
342 unsigned int suspend_wait: 1;
343 int suspend_result;
344 int suspends_pending;
345 int standbys_pending;
346 int suspends_read;
347 int standbys_read;
348 int event_head;
349 int event_tail;
350 apm_event_t events[APM_MAX_EVENTS];
351 };
352
353 /*
354 * The magic number in apm_user
355 */
356 #define APM_BIOS_MAGIC 0x4101
357
358 /*
359 * idle percentage above which bios idle calls are done
360 */
361 #ifdef CONFIG_APM_CPU_IDLE
362 #define DEFAULT_IDLE_THRESHOLD 95
363 #else
364 #define DEFAULT_IDLE_THRESHOLD 100
365 #endif
366 #define DEFAULT_IDLE_PERIOD (100 / 3)
367
368 /*
369 * Local variables
370 */
371 static struct {
372 unsigned long offset;
373 unsigned short segment;
374 } apm_bios_entry;
375 static int clock_slowed;
376 static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
377 static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
378 static int set_pm_idle;
379 static int suspends_pending;
380 static int standbys_pending;
381 static int ignore_sys_suspend;
382 static int ignore_normal_resume;
383 static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
384
385 static int debug __read_mostly;
386 static int smp __read_mostly;
387 static int apm_disabled = -1;
388 #ifdef CONFIG_SMP
389 static int power_off;
390 #else
391 static int power_off = 1;
392 #endif
393 static int realmode_power_off;
394 #ifdef CONFIG_APM_ALLOW_INTS
395 static int allow_ints = 1;
396 #else
397 static int allow_ints;
398 #endif
399 static int broken_psr;
400
401 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
402 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
403 static struct apm_user *user_list;
404 static DEFINE_SPINLOCK(user_list_lock);
405 static DEFINE_MUTEX(apm_mutex);
406
407 /*
408 * Set up a segment that references the real mode segment 0x40
409 * that extends up to the end of page zero (that we have reserved).
410 * This is for buggy BIOS's that refer to (real mode) segment 0x40
411 * even though they are called in protected mode.
412 */
413 static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
414 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
415
416 static const char driver_version[] = "1.16ac"; /* no spaces */
417
418 static struct task_struct *kapmd_task;
419
420 /*
421 * APM event names taken from the APM 1.2 specification. These are
422 * the message codes that the BIOS uses to tell us about events
423 */
424 static const char * const apm_event_name[] = {
425 "system standby",
426 "system suspend",
427 "normal resume",
428 "critical resume",
429 "low battery",
430 "power status change",
431 "update time",
432 "critical suspend",
433 "user standby",
434 "user suspend",
435 "system standby resume",
436 "capabilities change"
437 };
438 #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
439
440 typedef struct lookup_t {
441 int key;
442 char *msg;
443 } lookup_t;
444
445 /*
446 * The BIOS returns a set of standard error codes in AX when the
447 * carry flag is set.
448 */
449
450 static const lookup_t error_table[] = {
451 /* N/A { APM_SUCCESS, "Operation succeeded" }, */
452 { APM_DISABLED, "Power management disabled" },
453 { APM_CONNECTED, "Real mode interface already connected" },
454 { APM_NOT_CONNECTED, "Interface not connected" },
455 { APM_16_CONNECTED, "16 bit interface already connected" },
456 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
457 { APM_32_CONNECTED, "32 bit interface already connected" },
458 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
459 { APM_BAD_DEVICE, "Unrecognized device ID" },
460 { APM_BAD_PARAM, "Parameter out of range" },
461 { APM_NOT_ENGAGED, "Interface not engaged" },
462 { APM_BAD_FUNCTION, "Function not supported" },
463 { APM_RESUME_DISABLED, "Resume timer disabled" },
464 { APM_BAD_STATE, "Unable to enter requested state" },
465 /* N/A { APM_NO_EVENTS, "No events pending" }, */
466 { APM_NO_ERROR, "BIOS did not set a return code" },
467 { APM_NOT_PRESENT, "No APM present" }
468 };
469 #define ERROR_COUNT ARRAY_SIZE(error_table)
470
471 /**
472 * apm_error - display an APM error
473 * @str: information string
474 * @err: APM BIOS return code
475 *
476 * Write a meaningful log entry to the kernel log in the event of
477 * an APM error. Note that this also handles (negative) kernel errors.
478 */
479
480 static void apm_error(char *str, int err)
481 {
482 int i;
483
484 for (i = 0; i < ERROR_COUNT; i++)
485 if (error_table[i].key == err)
486 break;
487 if (i < ERROR_COUNT)
488 printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
489 else if (err < 0)
490 printk(KERN_NOTICE "apm: %s: linux error code %i\n", str, err);
491 else
492 printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
493 str, err);
494 }
495
496 /*
497 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
498 * apm_info.allow_ints, we are being really paranoid here! Not only
499 * are interrupts disabled, but all the segment registers (except SS)
500 * are saved and zeroed this means that if the BIOS tries to reference
501 * any data without explicitly loading the segment registers, the kernel
502 * will fault immediately rather than have some unforeseen circumstances
503 * for the rest of the kernel. And it will be very obvious! :-) Doing
504 * this depends on CS referring to the same physical memory as DS so that
505 * DS can be zeroed before the call. Unfortunately, we can't do anything
506 * about the stack segment/pointer. Also, we tell the compiler that
507 * everything could change.
508 *
509 * Also, we KNOW that for the non error case of apm_bios_call, there
510 * is no useful data returned in the low order 8 bits of eax.
511 */
512
513 static inline unsigned long __apm_irq_save(void)
514 {
515 unsigned long flags;
516 local_save_flags(flags);
517 if (apm_info.allow_ints) {
518 if (irqs_disabled_flags(flags))
519 local_irq_enable();
520 } else
521 local_irq_disable();
522
523 return flags;
524 }
525
526 #define apm_irq_save(flags) \
527 do { flags = __apm_irq_save(); } while (0)
528
529 static inline void apm_irq_restore(unsigned long flags)
530 {
531 if (irqs_disabled_flags(flags))
532 local_irq_disable();
533 else if (irqs_disabled())
534 local_irq_enable();
535 }
536
537 #ifdef APM_ZERO_SEGS
538 # define APM_DECL_SEGS \
539 unsigned int saved_fs; unsigned int saved_gs;
540 # define APM_DO_SAVE_SEGS \
541 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
542 # define APM_DO_RESTORE_SEGS \
543 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
544 #else
545 # define APM_DECL_SEGS
546 # define APM_DO_SAVE_SEGS
547 # define APM_DO_RESTORE_SEGS
548 #endif
549
550 struct apm_bios_call {
551 u32 func;
552 /* In and out */
553 u32 ebx;
554 u32 ecx;
555 /* Out only */
556 u32 eax;
557 u32 edx;
558 u32 esi;
559
560 /* Error: -ENOMEM, or bits 8-15 of eax */
561 int err;
562 };
563
564 /**
565 * __apm_bios_call - Make an APM BIOS 32bit call
566 * @_call: pointer to struct apm_bios_call.
567 *
568 * Make an APM call using the 32bit protected mode interface. The
569 * caller is responsible for knowing if APM BIOS is configured and
570 * enabled. This call can disable interrupts for a long period of
571 * time on some laptops. The return value is in AH and the carry
572 * flag is loaded into AL. If there is an error, then the error
573 * code is returned in AH (bits 8-15 of eax) and this function
574 * returns non-zero.
575 *
576 * Note: this makes the call on the current CPU.
577 */
578 static long __apm_bios_call(void *_call)
579 {
580 APM_DECL_SEGS
581 unsigned long flags;
582 int cpu;
583 struct desc_struct save_desc_40;
584 struct desc_struct *gdt;
585 struct apm_bios_call *call = _call;
586
587 cpu = get_cpu();
588 BUG_ON(cpu != 0);
589 gdt = get_cpu_gdt_table(cpu);
590 save_desc_40 = gdt[0x40 / 8];
591 gdt[0x40 / 8] = bad_bios_desc;
592
593 apm_irq_save(flags);
594 APM_DO_SAVE_SEGS;
595 apm_bios_call_asm(call->func, call->ebx, call->ecx,
596 &call->eax, &call->ebx, &call->ecx, &call->edx,
597 &call->esi);
598 APM_DO_RESTORE_SEGS;
599 apm_irq_restore(flags);
600 gdt[0x40 / 8] = save_desc_40;
601 put_cpu();
602
603 return call->eax & 0xff;
604 }
605
606 /* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
607 static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
608 {
609 int ret;
610
611 /* Don't bother with work_on_cpu in the common case, so we don't
612 * have to worry about OOM or overhead. */
613 if (get_cpu() == 0) {
614 ret = fn(call);
615 put_cpu();
616 } else {
617 put_cpu();
618 ret = work_on_cpu(0, fn, call);
619 }
620
621 /* work_on_cpu can fail with -ENOMEM */
622 if (ret < 0)
623 call->err = ret;
624 else
625 call->err = (call->eax >> 8) & 0xff;
626
627 return ret;
628 }
629
630 /**
631 * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0)
632 * @call: the apm_bios_call registers.
633 *
634 * If there is an error, it is returned in @call.err.
635 */
636 static int apm_bios_call(struct apm_bios_call *call)
637 {
638 return on_cpu0(__apm_bios_call, call);
639 }
640
641 /**
642 * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
643 * @_call: pointer to struct apm_bios_call.
644 *
645 * Make a BIOS call that returns one value only, or just status.
646 * If there is an error, then the error code is returned in AH
647 * (bits 8-15 of eax) and this function returns non-zero (it can
648 * also return -ENOMEM). This is used for simpler BIOS operations.
649 * This call may hold interrupts off for a long time on some laptops.
650 *
651 * Note: this makes the call on the current CPU.
652 */
653 static long __apm_bios_call_simple(void *_call)
654 {
655 u8 error;
656 APM_DECL_SEGS
657 unsigned long flags;
658 int cpu;
659 struct desc_struct save_desc_40;
660 struct desc_struct *gdt;
661 struct apm_bios_call *call = _call;
662
663 cpu = get_cpu();
664 BUG_ON(cpu != 0);
665 gdt = get_cpu_gdt_table(cpu);
666 save_desc_40 = gdt[0x40 / 8];
667 gdt[0x40 / 8] = bad_bios_desc;
668
669 apm_irq_save(flags);
670 APM_DO_SAVE_SEGS;
671 error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
672 &call->eax);
673 APM_DO_RESTORE_SEGS;
674 apm_irq_restore(flags);
675 gdt[0x40 / 8] = save_desc_40;
676 put_cpu();
677 return error;
678 }
679
680 /**
681 * apm_bios_call_simple - make a simple APM BIOS 32bit call
682 * @func: APM function to invoke
683 * @ebx_in: EBX register value for BIOS call
684 * @ecx_in: ECX register value for BIOS call
685 * @eax: EAX register on return from the BIOS call
686 * @err: bits
687 *
688 * Make a BIOS call that returns one value only, or just status.
689 * If there is an error, then the error code is returned in @err
690 * and this function returns non-zero. This is used for simpler
691 * BIOS operations. This call may hold interrupts off for a long
692 * time on some laptops.
693 */
694 static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
695 int *err)
696 {
697 struct apm_bios_call call;
698 int ret;
699
700 call.func = func;
701 call.ebx = ebx_in;
702 call.ecx = ecx_in;
703
704 ret = on_cpu0(__apm_bios_call_simple, &call);
705 *eax = call.eax;
706 *err = call.err;
707 return ret;
708 }
709
710 /**
711 * apm_driver_version - APM driver version
712 * @val: loaded with the APM version on return
713 *
714 * Retrieve the APM version supported by the BIOS. This is only
715 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
716 * probably present.
717 *
718 * On entry val should point to a value indicating the APM driver
719 * version with the high byte being the major and the low byte the
720 * minor number both in BCD
721 *
722 * On return it will hold the BIOS revision supported in the
723 * same format.
724 */
725
726 static int apm_driver_version(u_short *val)
727 {
728 u32 eax;
729 int err;
730
731 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
732 return err;
733 *val = eax;
734 return APM_SUCCESS;
735 }
736
737 /**
738 * apm_get_event - get an APM event from the BIOS
739 * @event: pointer to the event
740 * @info: point to the event information
741 *
742 * The APM BIOS provides a polled information for event
743 * reporting. The BIOS expects to be polled at least every second
744 * when events are pending. When a message is found the caller should
745 * poll until no more messages are present. However, this causes
746 * problems on some laptops where a suspend event notification is
747 * not cleared until it is acknowledged.
748 *
749 * Additional information is returned in the info pointer, providing
750 * that APM 1.2 is in use. If no messges are pending the value 0x80
751 * is returned (No power management events pending).
752 */
753 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
754 {
755 struct apm_bios_call call;
756
757 call.func = APM_FUNC_GET_EVENT;
758 call.ebx = call.ecx = 0;
759
760 if (apm_bios_call(&call))
761 return call.err;
762
763 *event = call.ebx;
764 if (apm_info.connection_version < 0x0102)
765 *info = ~0; /* indicate info not valid */
766 else
767 *info = call.ecx;
768 return APM_SUCCESS;
769 }
770
771 /**
772 * set_power_state - set the power management state
773 * @what: which items to transition
774 * @state: state to transition to
775 *
776 * Request an APM change of state for one or more system devices. The
777 * processor state must be transitioned last of all. what holds the
778 * class of device in the upper byte and the device number (0xFF for
779 * all) for the object to be transitioned.
780 *
781 * The state holds the state to transition to, which may in fact
782 * be an acceptance of a BIOS requested state change.
783 */
784
785 static int set_power_state(u_short what, u_short state)
786 {
787 u32 eax;
788 int err;
789
790 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
791 return err;
792 return APM_SUCCESS;
793 }
794
795 /**
796 * set_system_power_state - set system wide power state
797 * @state: which state to enter
798 *
799 * Transition the entire system into a new APM power state.
800 */
801
802 static int set_system_power_state(u_short state)
803 {
804 return set_power_state(APM_DEVICE_ALL, state);
805 }
806
807 /**
808 * apm_do_idle - perform power saving
809 *
810 * This function notifies the BIOS that the processor is (in the view
811 * of the OS) idle. It returns -1 in the event that the BIOS refuses
812 * to handle the idle request. On a success the function returns 1
813 * if the BIOS did clock slowing or 0 otherwise.
814 */
815
816 static int apm_do_idle(void)
817 {
818 u32 eax;
819 u8 ret = 0;
820 int idled = 0;
821 int polling;
822 int err = 0;
823
824 polling = !!(current_thread_info()->status & TS_POLLING);
825 if (polling) {
826 current_thread_info()->status &= ~TS_POLLING;
827 /*
828 * TS_POLLING-cleared state must be visible before we
829 * test NEED_RESCHED:
830 */
831 smp_mb();
832 }
833 if (!need_resched()) {
834 idled = 1;
835 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
836 }
837 if (polling)
838 current_thread_info()->status |= TS_POLLING;
839
840 if (!idled)
841 return 0;
842
843 if (ret) {
844 static unsigned long t;
845
846 /* This always fails on some SMP boards running UP kernels.
847 * Only report the failure the first 5 times.
848 */
849 if (++t < 5) {
850 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
851 t = jiffies;
852 }
853 return -1;
854 }
855 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
856 return clock_slowed;
857 }
858
859 /**
860 * apm_do_busy - inform the BIOS the CPU is busy
861 *
862 * Request that the BIOS brings the CPU back to full performance.
863 */
864
865 static void apm_do_busy(void)
866 {
867 u32 dummy;
868 int err;
869
870 if (clock_slowed || ALWAYS_CALL_BUSY) {
871 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
872 clock_slowed = 0;
873 }
874 }
875
876 /*
877 * If no process has really been interested in
878 * the CPU for some time, we want to call BIOS
879 * power management - we probably want
880 * to conserve power.
881 */
882 #define IDLE_CALC_LIMIT (HZ * 100)
883 #define IDLE_LEAKY_MAX 16
884
885 static void (*original_pm_idle)(void) __read_mostly;
886
887 /**
888 * apm_cpu_idle - cpu idling for APM capable Linux
889 *
890 * This is the idling function the kernel executes when APM is available. It
891 * tries to do BIOS powermanagement based on the average system idle time.
892 * Furthermore it calls the system default idle routine.
893 */
894
895 static void apm_cpu_idle(void)
896 {
897 static int use_apm_idle; /* = 0 */
898 static unsigned int last_jiffies; /* = 0 */
899 static unsigned int last_stime; /* = 0 */
900
901 int apm_idle_done = 0;
902 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
903 unsigned int bucket;
904
905 recalc:
906 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
907 use_apm_idle = 0;
908 last_jiffies = jiffies;
909 last_stime = current->stime;
910 } else if (jiffies_since_last_check > idle_period) {
911 unsigned int idle_percentage;
912
913 idle_percentage = current->stime - last_stime;
914 idle_percentage *= 100;
915 idle_percentage /= jiffies_since_last_check;
916 use_apm_idle = (idle_percentage > idle_threshold);
917 if (apm_info.forbid_idle)
918 use_apm_idle = 0;
919 last_jiffies = jiffies;
920 last_stime = current->stime;
921 }
922
923 bucket = IDLE_LEAKY_MAX;
924
925 while (!need_resched()) {
926 if (use_apm_idle) {
927 unsigned int t;
928
929 t = jiffies;
930 switch (apm_do_idle()) {
931 case 0:
932 apm_idle_done = 1;
933 if (t != jiffies) {
934 if (bucket) {
935 bucket = IDLE_LEAKY_MAX;
936 continue;
937 }
938 } else if (bucket) {
939 bucket--;
940 continue;
941 }
942 break;
943 case 1:
944 apm_idle_done = 1;
945 break;
946 default: /* BIOS refused */
947 break;
948 }
949 }
950 if (original_pm_idle)
951 original_pm_idle();
952 else
953 default_idle();
954 local_irq_disable();
955 jiffies_since_last_check = jiffies - last_jiffies;
956 if (jiffies_since_last_check > idle_period)
957 goto recalc;
958 }
959
960 if (apm_idle_done)
961 apm_do_busy();
962
963 local_irq_enable();
964 }
965
966 /**
967 * apm_power_off - ask the BIOS to power off
968 *
969 * Handle the power off sequence. This is the one piece of code we
970 * will execute even on SMP machines. In order to deal with BIOS
971 * bugs we support real mode APM BIOS power off calls. We also make
972 * the SMP call on CPU0 as some systems will only honour this call
973 * on their first cpu.
974 */
975
976 static void apm_power_off(void)
977 {
978 unsigned char po_bios_call[] = {
979 0xb8, 0x00, 0x10, /* movw $0x1000,ax */
980 0x8e, 0xd0, /* movw ax,ss */
981 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
982 0xb8, 0x07, 0x53, /* movw $0x5307,ax */
983 0xbb, 0x01, 0x00, /* movw $0x0001,bx */
984 0xb9, 0x03, 0x00, /* movw $0x0003,cx */
985 0xcd, 0x15 /* int $0x15 */
986 };
987
988 /* Some bioses don't like being called from CPU != 0 */
989 if (apm_info.realmode_power_off) {
990 set_cpus_allowed_ptr(current, cpumask_of(0));
991 machine_real_restart(po_bios_call, sizeof(po_bios_call));
992 } else {
993 (void)set_system_power_state(APM_STATE_OFF);
994 }
995 }
996
997 #ifdef CONFIG_APM_DO_ENABLE
998
999 /**
1000 * apm_enable_power_management - enable BIOS APM power management
1001 * @enable: enable yes/no
1002 *
1003 * Enable or disable the APM BIOS power services.
1004 */
1005
1006 static int apm_enable_power_management(int enable)
1007 {
1008 u32 eax;
1009 int err;
1010
1011 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1012 return APM_NOT_ENGAGED;
1013 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1014 enable, &eax, &err))
1015 return err;
1016 if (enable)
1017 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1018 else
1019 apm_info.bios.flags |= APM_BIOS_DISABLED;
1020 return APM_SUCCESS;
1021 }
1022 #endif
1023
1024 /**
1025 * apm_get_power_status - get current power state
1026 * @status: returned status
1027 * @bat: battery info
1028 * @life: estimated life
1029 *
1030 * Obtain the current power status from the APM BIOS. We return a
1031 * status which gives the rough battery status, and current power
1032 * source. The bat value returned give an estimate as a percentage
1033 * of life and a status value for the battery. The estimated life
1034 * if reported is a lifetime in secodnds/minutes at current powwer
1035 * consumption.
1036 */
1037
1038 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1039 {
1040 struct apm_bios_call call;
1041
1042 call.func = APM_FUNC_GET_STATUS;
1043 call.ebx = APM_DEVICE_ALL;
1044 call.ecx = 0;
1045
1046 if (apm_info.get_power_status_broken)
1047 return APM_32_UNSUPPORTED;
1048 if (apm_bios_call(&call))
1049 return call.err;
1050 *status = call.ebx;
1051 *bat = call.ecx;
1052 if (apm_info.get_power_status_swabinminutes) {
1053 *life = swab16((u16)call.edx);
1054 *life |= 0x8000;
1055 } else
1056 *life = call.edx;
1057 return APM_SUCCESS;
1058 }
1059
1060 #if 0
1061 static int apm_get_battery_status(u_short which, u_short *status,
1062 u_short *bat, u_short *life, u_short *nbat)
1063 {
1064 u32 eax;
1065 u32 ebx;
1066 u32 ecx;
1067 u32 edx;
1068 u32 esi;
1069
1070 if (apm_info.connection_version < 0x0102) {
1071 /* pretend we only have one battery. */
1072 if (which != 1)
1073 return APM_BAD_DEVICE;
1074 *nbat = 1;
1075 return apm_get_power_status(status, bat, life);
1076 }
1077
1078 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1079 &ebx, &ecx, &edx, &esi))
1080 return (eax >> 8) & 0xff;
1081 *status = ebx;
1082 *bat = ecx;
1083 *life = edx;
1084 *nbat = esi;
1085 return APM_SUCCESS;
1086 }
1087 #endif
1088
1089 /**
1090 * apm_engage_power_management - enable PM on a device
1091 * @device: identity of device
1092 * @enable: on/off
1093 *
1094 * Activate or deactive power management on either a specific device
1095 * or the entire system (%APM_DEVICE_ALL).
1096 */
1097
1098 static int apm_engage_power_management(u_short device, int enable)
1099 {
1100 u32 eax;
1101 int err;
1102
1103 if ((enable == 0) && (device == APM_DEVICE_ALL)
1104 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1105 return APM_DISABLED;
1106 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1107 &eax, &err))
1108 return err;
1109 if (device == APM_DEVICE_ALL) {
1110 if (enable)
1111 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1112 else
1113 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1114 }
1115 return APM_SUCCESS;
1116 }
1117
1118 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1119
1120 /**
1121 * apm_console_blank - blank the display
1122 * @blank: on/off
1123 *
1124 * Attempt to blank the console, firstly by blanking just video device
1125 * zero, and if that fails (some BIOSes don't support it) then it blanks
1126 * all video devices. Typically the BIOS will do laptop backlight and
1127 * monitor powerdown for us.
1128 */
1129
1130 static int apm_console_blank(int blank)
1131 {
1132 int error = APM_NOT_ENGAGED; /* silence gcc */
1133 int i;
1134 u_short state;
1135 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1136
1137 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1138
1139 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1140 error = set_power_state(dev[i], state);
1141
1142 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1143 return 1;
1144
1145 if (error == APM_NOT_ENGAGED)
1146 break;
1147 }
1148
1149 if (error == APM_NOT_ENGAGED) {
1150 static int tried;
1151 int eng_error;
1152 if (tried++ == 0) {
1153 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1154 if (eng_error) {
1155 apm_error("set display", error);
1156 apm_error("engage interface", eng_error);
1157 return 0;
1158 } else
1159 return apm_console_blank(blank);
1160 }
1161 }
1162 apm_error("set display", error);
1163 return 0;
1164 }
1165 #endif
1166
1167 static int queue_empty(struct apm_user *as)
1168 {
1169 return as->event_head == as->event_tail;
1170 }
1171
1172 static apm_event_t get_queued_event(struct apm_user *as)
1173 {
1174 if (++as->event_tail >= APM_MAX_EVENTS)
1175 as->event_tail = 0;
1176 return as->events[as->event_tail];
1177 }
1178
1179 static void queue_event(apm_event_t event, struct apm_user *sender)
1180 {
1181 struct apm_user *as;
1182
1183 spin_lock(&user_list_lock);
1184 if (user_list == NULL)
1185 goto out;
1186 for (as = user_list; as != NULL; as = as->next) {
1187 if ((as == sender) || (!as->reader))
1188 continue;
1189 if (++as->event_head >= APM_MAX_EVENTS)
1190 as->event_head = 0;
1191
1192 if (as->event_head == as->event_tail) {
1193 static int notified;
1194
1195 if (notified++ == 0)
1196 printk(KERN_ERR "apm: an event queue overflowed\n");
1197 if (++as->event_tail >= APM_MAX_EVENTS)
1198 as->event_tail = 0;
1199 }
1200 as->events[as->event_head] = event;
1201 if (!as->suser || !as->writer)
1202 continue;
1203 switch (event) {
1204 case APM_SYS_SUSPEND:
1205 case APM_USER_SUSPEND:
1206 as->suspends_pending++;
1207 suspends_pending++;
1208 break;
1209
1210 case APM_SYS_STANDBY:
1211 case APM_USER_STANDBY:
1212 as->standbys_pending++;
1213 standbys_pending++;
1214 break;
1215 }
1216 }
1217 wake_up_interruptible(&apm_waitqueue);
1218 out:
1219 spin_unlock(&user_list_lock);
1220 }
1221
1222 static void reinit_timer(void)
1223 {
1224 #ifdef INIT_TIMER_AFTER_SUSPEND
1225 unsigned long flags;
1226
1227 raw_spin_lock_irqsave(&i8253_lock, flags);
1228 /* set the clock to HZ */
1229 outb_pit(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1230 udelay(10);
1231 outb_pit(LATCH & 0xff, PIT_CH0); /* LSB */
1232 udelay(10);
1233 outb_pit(LATCH >> 8, PIT_CH0); /* MSB */
1234 udelay(10);
1235 raw_spin_unlock_irqrestore(&i8253_lock, flags);
1236 #endif
1237 }
1238
1239 static int suspend(int vetoable)
1240 {
1241 int err;
1242 struct apm_user *as;
1243
1244 dpm_suspend_start(PMSG_SUSPEND);
1245
1246 dpm_suspend_noirq(PMSG_SUSPEND);
1247
1248 local_irq_disable();
1249 sysdev_suspend(PMSG_SUSPEND);
1250
1251 local_irq_enable();
1252
1253 save_processor_state();
1254 err = set_system_power_state(APM_STATE_SUSPEND);
1255 ignore_normal_resume = 1;
1256 restore_processor_state();
1257
1258 local_irq_disable();
1259 reinit_timer();
1260
1261 if (err == APM_NO_ERROR)
1262 err = APM_SUCCESS;
1263 if (err != APM_SUCCESS)
1264 apm_error("suspend", err);
1265 err = (err == APM_SUCCESS) ? 0 : -EIO;
1266
1267 sysdev_resume();
1268 local_irq_enable();
1269
1270 dpm_resume_noirq(PMSG_RESUME);
1271
1272 dpm_resume_end(PMSG_RESUME);
1273 queue_event(APM_NORMAL_RESUME, NULL);
1274 spin_lock(&user_list_lock);
1275 for (as = user_list; as != NULL; as = as->next) {
1276 as->suspend_wait = 0;
1277 as->suspend_result = err;
1278 }
1279 spin_unlock(&user_list_lock);
1280 wake_up_interruptible(&apm_suspend_waitqueue);
1281 return err;
1282 }
1283
1284 static void standby(void)
1285 {
1286 int err;
1287
1288 dpm_suspend_noirq(PMSG_SUSPEND);
1289
1290 local_irq_disable();
1291 sysdev_suspend(PMSG_SUSPEND);
1292 local_irq_enable();
1293
1294 err = set_system_power_state(APM_STATE_STANDBY);
1295 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1296 apm_error("standby", err);
1297
1298 local_irq_disable();
1299 sysdev_resume();
1300 local_irq_enable();
1301
1302 dpm_resume_noirq(PMSG_RESUME);
1303 }
1304
1305 static apm_event_t get_event(void)
1306 {
1307 int error;
1308 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1309 apm_eventinfo_t info;
1310
1311 static int notified;
1312
1313 /* we don't use the eventinfo */
1314 error = apm_get_event(&event, &info);
1315 if (error == APM_SUCCESS)
1316 return event;
1317
1318 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1319 apm_error("get_event", error);
1320
1321 return 0;
1322 }
1323
1324 static void check_events(void)
1325 {
1326 apm_event_t event;
1327 static unsigned long last_resume;
1328 static int ignore_bounce;
1329
1330 while ((event = get_event()) != 0) {
1331 if (debug) {
1332 if (event <= NR_APM_EVENT_NAME)
1333 printk(KERN_DEBUG "apm: received %s notify\n",
1334 apm_event_name[event - 1]);
1335 else
1336 printk(KERN_DEBUG "apm: received unknown "
1337 "event 0x%02x\n", event);
1338 }
1339 if (ignore_bounce
1340 && (time_after(jiffies, last_resume + bounce_interval)))
1341 ignore_bounce = 0;
1342
1343 switch (event) {
1344 case APM_SYS_STANDBY:
1345 case APM_USER_STANDBY:
1346 queue_event(event, NULL);
1347 if (standbys_pending <= 0)
1348 standby();
1349 break;
1350
1351 case APM_USER_SUSPEND:
1352 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1353 if (apm_info.connection_version > 0x100)
1354 set_system_power_state(APM_STATE_REJECT);
1355 break;
1356 #endif
1357 case APM_SYS_SUSPEND:
1358 if (ignore_bounce) {
1359 if (apm_info.connection_version > 0x100)
1360 set_system_power_state(APM_STATE_REJECT);
1361 break;
1362 }
1363 /*
1364 * If we are already processing a SUSPEND,
1365 * then further SUSPEND events from the BIOS
1366 * will be ignored. We also return here to
1367 * cope with the fact that the Thinkpads keep
1368 * sending a SUSPEND event until something else
1369 * happens!
1370 */
1371 if (ignore_sys_suspend)
1372 return;
1373 ignore_sys_suspend = 1;
1374 queue_event(event, NULL);
1375 if (suspends_pending <= 0)
1376 (void) suspend(1);
1377 break;
1378
1379 case APM_NORMAL_RESUME:
1380 case APM_CRITICAL_RESUME:
1381 case APM_STANDBY_RESUME:
1382 ignore_sys_suspend = 0;
1383 last_resume = jiffies;
1384 ignore_bounce = 1;
1385 if ((event != APM_NORMAL_RESUME)
1386 || (ignore_normal_resume == 0)) {
1387 dpm_resume_end(PMSG_RESUME);
1388 queue_event(event, NULL);
1389 }
1390 ignore_normal_resume = 0;
1391 break;
1392
1393 case APM_CAPABILITY_CHANGE:
1394 case APM_LOW_BATTERY:
1395 case APM_POWER_STATUS_CHANGE:
1396 queue_event(event, NULL);
1397 /* If needed, notify drivers here */
1398 break;
1399
1400 case APM_UPDATE_TIME:
1401 break;
1402
1403 case APM_CRITICAL_SUSPEND:
1404 /*
1405 * We are not allowed to reject a critical suspend.
1406 */
1407 (void)suspend(0);
1408 break;
1409 }
1410 }
1411 }
1412
1413 static void apm_event_handler(void)
1414 {
1415 static int pending_count = 4;
1416 int err;
1417
1418 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1419 if ((apm_info.connection_version > 0x100) &&
1420 (pending_count-- <= 0)) {
1421 pending_count = 4;
1422 if (debug)
1423 printk(KERN_DEBUG "apm: setting state busy\n");
1424 err = set_system_power_state(APM_STATE_BUSY);
1425 if (err)
1426 apm_error("busy", err);
1427 }
1428 } else
1429 pending_count = 4;
1430 check_events();
1431 }
1432
1433 /*
1434 * This is the APM thread main loop.
1435 */
1436
1437 static void apm_mainloop(void)
1438 {
1439 DECLARE_WAITQUEUE(wait, current);
1440
1441 add_wait_queue(&apm_waitqueue, &wait);
1442 set_current_state(TASK_INTERRUPTIBLE);
1443 for (;;) {
1444 schedule_timeout(APM_CHECK_TIMEOUT);
1445 if (kthread_should_stop())
1446 break;
1447 /*
1448 * Ok, check all events, check for idle (and mark us sleeping
1449 * so as not to count towards the load average)..
1450 */
1451 set_current_state(TASK_INTERRUPTIBLE);
1452 apm_event_handler();
1453 }
1454 remove_wait_queue(&apm_waitqueue, &wait);
1455 }
1456
1457 static int check_apm_user(struct apm_user *as, const char *func)
1458 {
1459 if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1460 printk(KERN_ERR "apm: %s passed bad filp\n", func);
1461 return 1;
1462 }
1463 return 0;
1464 }
1465
1466 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1467 {
1468 struct apm_user *as;
1469 int i;
1470 apm_event_t event;
1471
1472 as = fp->private_data;
1473 if (check_apm_user(as, "read"))
1474 return -EIO;
1475 if ((int)count < sizeof(apm_event_t))
1476 return -EINVAL;
1477 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1478 return -EAGAIN;
1479 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1480 i = count;
1481 while ((i >= sizeof(event)) && !queue_empty(as)) {
1482 event = get_queued_event(as);
1483 if (copy_to_user(buf, &event, sizeof(event))) {
1484 if (i < count)
1485 break;
1486 return -EFAULT;
1487 }
1488 switch (event) {
1489 case APM_SYS_SUSPEND:
1490 case APM_USER_SUSPEND:
1491 as->suspends_read++;
1492 break;
1493
1494 case APM_SYS_STANDBY:
1495 case APM_USER_STANDBY:
1496 as->standbys_read++;
1497 break;
1498 }
1499 buf += sizeof(event);
1500 i -= sizeof(event);
1501 }
1502 if (i < count)
1503 return count - i;
1504 if (signal_pending(current))
1505 return -ERESTARTSYS;
1506 return 0;
1507 }
1508
1509 static unsigned int do_poll(struct file *fp, poll_table *wait)
1510 {
1511 struct apm_user *as;
1512
1513 as = fp->private_data;
1514 if (check_apm_user(as, "poll"))
1515 return 0;
1516 poll_wait(fp, &apm_waitqueue, wait);
1517 if (!queue_empty(as))
1518 return POLLIN | POLLRDNORM;
1519 return 0;
1520 }
1521
1522 static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1523 {
1524 struct apm_user *as;
1525 int ret;
1526
1527 as = filp->private_data;
1528 if (check_apm_user(as, "ioctl"))
1529 return -EIO;
1530 if (!as->suser || !as->writer)
1531 return -EPERM;
1532 switch (cmd) {
1533 case APM_IOC_STANDBY:
1534 mutex_lock(&apm_mutex);
1535 if (as->standbys_read > 0) {
1536 as->standbys_read--;
1537 as->standbys_pending--;
1538 standbys_pending--;
1539 } else
1540 queue_event(APM_USER_STANDBY, as);
1541 if (standbys_pending <= 0)
1542 standby();
1543 mutex_unlock(&apm_mutex);
1544 break;
1545 case APM_IOC_SUSPEND:
1546 mutex_lock(&apm_mutex);
1547 if (as->suspends_read > 0) {
1548 as->suspends_read--;
1549 as->suspends_pending--;
1550 suspends_pending--;
1551 } else
1552 queue_event(APM_USER_SUSPEND, as);
1553 if (suspends_pending <= 0) {
1554 ret = suspend(1);
1555 mutex_unlock(&apm_mutex);
1556 } else {
1557 as->suspend_wait = 1;
1558 mutex_unlock(&apm_mutex);
1559 wait_event_interruptible(apm_suspend_waitqueue,
1560 as->suspend_wait == 0);
1561 ret = as->suspend_result;
1562 }
1563 return ret;
1564 default:
1565 return -ENOTTY;
1566 }
1567 return 0;
1568 }
1569
1570 static int do_release(struct inode *inode, struct file *filp)
1571 {
1572 struct apm_user *as;
1573
1574 as = filp->private_data;
1575 if (check_apm_user(as, "release"))
1576 return 0;
1577 filp->private_data = NULL;
1578 if (as->standbys_pending > 0) {
1579 standbys_pending -= as->standbys_pending;
1580 if (standbys_pending <= 0)
1581 standby();
1582 }
1583 if (as->suspends_pending > 0) {
1584 suspends_pending -= as->suspends_pending;
1585 if (suspends_pending <= 0)
1586 (void) suspend(1);
1587 }
1588 spin_lock(&user_list_lock);
1589 if (user_list == as)
1590 user_list = as->next;
1591 else {
1592 struct apm_user *as1;
1593
1594 for (as1 = user_list;
1595 (as1 != NULL) && (as1->next != as);
1596 as1 = as1->next)
1597 ;
1598 if (as1 == NULL)
1599 printk(KERN_ERR "apm: filp not in user list\n");
1600 else
1601 as1->next = as->next;
1602 }
1603 spin_unlock(&user_list_lock);
1604 kfree(as);
1605 return 0;
1606 }
1607
1608 static int do_open(struct inode *inode, struct file *filp)
1609 {
1610 struct apm_user *as;
1611
1612 as = kmalloc(sizeof(*as), GFP_KERNEL);
1613 if (as == NULL) {
1614 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1615 sizeof(*as));
1616 return -ENOMEM;
1617 }
1618 as->magic = APM_BIOS_MAGIC;
1619 as->event_tail = as->event_head = 0;
1620 as->suspends_pending = as->standbys_pending = 0;
1621 as->suspends_read = as->standbys_read = 0;
1622 /*
1623 * XXX - this is a tiny bit broken, when we consider BSD
1624 * process accounting. If the device is opened by root, we
1625 * instantly flag that we used superuser privs. Who knows,
1626 * we might close the device immediately without doing a
1627 * privileged operation -- cevans
1628 */
1629 as->suser = capable(CAP_SYS_ADMIN);
1630 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1631 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1632 spin_lock(&user_list_lock);
1633 as->next = user_list;
1634 user_list = as;
1635 spin_unlock(&user_list_lock);
1636 filp->private_data = as;
1637 return 0;
1638 }
1639
1640 static int proc_apm_show(struct seq_file *m, void *v)
1641 {
1642 unsigned short bx;
1643 unsigned short cx;
1644 unsigned short dx;
1645 int error;
1646 unsigned short ac_line_status = 0xff;
1647 unsigned short battery_status = 0xff;
1648 unsigned short battery_flag = 0xff;
1649 int percentage = -1;
1650 int time_units = -1;
1651 char *units = "?";
1652
1653 if ((num_online_cpus() == 1) &&
1654 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1655 ac_line_status = (bx >> 8) & 0xff;
1656 battery_status = bx & 0xff;
1657 if ((cx & 0xff) != 0xff)
1658 percentage = cx & 0xff;
1659
1660 if (apm_info.connection_version > 0x100) {
1661 battery_flag = (cx >> 8) & 0xff;
1662 if (dx != 0xffff) {
1663 units = (dx & 0x8000) ? "min" : "sec";
1664 time_units = dx & 0x7fff;
1665 }
1666 }
1667 }
1668 /* Arguments, with symbols from linux/apm_bios.h. Information is
1669 from the Get Power Status (0x0a) call unless otherwise noted.
1670
1671 0) Linux driver version (this will change if format changes)
1672 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1673 2) APM flags from APM Installation Check (0x00):
1674 bit 0: APM_16_BIT_SUPPORT
1675 bit 1: APM_32_BIT_SUPPORT
1676 bit 2: APM_IDLE_SLOWS_CLOCK
1677 bit 3: APM_BIOS_DISABLED
1678 bit 4: APM_BIOS_DISENGAGED
1679 3) AC line status
1680 0x00: Off-line
1681 0x01: On-line
1682 0x02: On backup power (BIOS >= 1.1 only)
1683 0xff: Unknown
1684 4) Battery status
1685 0x00: High
1686 0x01: Low
1687 0x02: Critical
1688 0x03: Charging
1689 0x04: Selected battery not present (BIOS >= 1.2 only)
1690 0xff: Unknown
1691 5) Battery flag
1692 bit 0: High
1693 bit 1: Low
1694 bit 2: Critical
1695 bit 3: Charging
1696 bit 7: No system battery
1697 0xff: Unknown
1698 6) Remaining battery life (percentage of charge):
1699 0-100: valid
1700 -1: Unknown
1701 7) Remaining battery life (time units):
1702 Number of remaining minutes or seconds
1703 -1: Unknown
1704 8) min = minutes; sec = seconds */
1705
1706 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1707 driver_version,
1708 (apm_info.bios.version >> 8) & 0xff,
1709 apm_info.bios.version & 0xff,
1710 apm_info.bios.flags,
1711 ac_line_status,
1712 battery_status,
1713 battery_flag,
1714 percentage,
1715 time_units,
1716 units);
1717 return 0;
1718 }
1719
1720 static int proc_apm_open(struct inode *inode, struct file *file)
1721 {
1722 return single_open(file, proc_apm_show, NULL);
1723 }
1724
1725 static const struct file_operations apm_file_ops = {
1726 .owner = THIS_MODULE,
1727 .open = proc_apm_open,
1728 .read = seq_read,
1729 .llseek = seq_lseek,
1730 .release = single_release,
1731 };
1732
1733 static int apm(void *unused)
1734 {
1735 unsigned short bx;
1736 unsigned short cx;
1737 unsigned short dx;
1738 int error;
1739 char *power_stat;
1740 char *bat_stat;
1741
1742 /* 2002/08/01 - WT
1743 * This is to avoid random crashes at boot time during initialization
1744 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1745 * Some bioses don't like being called from CPU != 0.
1746 * Method suggested by Ingo Molnar.
1747 */
1748 set_cpus_allowed_ptr(current, cpumask_of(0));
1749 BUG_ON(smp_processor_id() != 0);
1750
1751 if (apm_info.connection_version == 0) {
1752 apm_info.connection_version = apm_info.bios.version;
1753 if (apm_info.connection_version > 0x100) {
1754 /*
1755 * We only support BIOSs up to version 1.2
1756 */
1757 if (apm_info.connection_version > 0x0102)
1758 apm_info.connection_version = 0x0102;
1759 error = apm_driver_version(&apm_info.connection_version);
1760 if (error != APM_SUCCESS) {
1761 apm_error("driver version", error);
1762 /* Fall back to an APM 1.0 connection. */
1763 apm_info.connection_version = 0x100;
1764 }
1765 }
1766 }
1767
1768 if (debug)
1769 printk(KERN_INFO "apm: Connection version %d.%d\n",
1770 (apm_info.connection_version >> 8) & 0xff,
1771 apm_info.connection_version & 0xff);
1772
1773 #ifdef CONFIG_APM_DO_ENABLE
1774 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1775 /*
1776 * This call causes my NEC UltraLite Versa 33/C to hang if it
1777 * is booted with PM disabled but not in the docking station.
1778 * Unfortunate ...
1779 */
1780 error = apm_enable_power_management(1);
1781 if (error) {
1782 apm_error("enable power management", error);
1783 return -1;
1784 }
1785 }
1786 #endif
1787
1788 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1789 && (apm_info.connection_version > 0x0100)) {
1790 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1791 if (error) {
1792 apm_error("engage power management", error);
1793 return -1;
1794 }
1795 }
1796
1797 if (debug && (num_online_cpus() == 1 || smp)) {
1798 error = apm_get_power_status(&bx, &cx, &dx);
1799 if (error)
1800 printk(KERN_INFO "apm: power status not available\n");
1801 else {
1802 switch ((bx >> 8) & 0xff) {
1803 case 0:
1804 power_stat = "off line";
1805 break;
1806 case 1:
1807 power_stat = "on line";
1808 break;
1809 case 2:
1810 power_stat = "on backup power";
1811 break;
1812 default:
1813 power_stat = "unknown";
1814 break;
1815 }
1816 switch (bx & 0xff) {
1817 case 0:
1818 bat_stat = "high";
1819 break;
1820 case 1:
1821 bat_stat = "low";
1822 break;
1823 case 2:
1824 bat_stat = "critical";
1825 break;
1826 case 3:
1827 bat_stat = "charging";
1828 break;
1829 default:
1830 bat_stat = "unknown";
1831 break;
1832 }
1833 printk(KERN_INFO
1834 "apm: AC %s, battery status %s, battery life ",
1835 power_stat, bat_stat);
1836 if ((cx & 0xff) == 0xff)
1837 printk("unknown\n");
1838 else
1839 printk("%d%%\n", cx & 0xff);
1840 if (apm_info.connection_version > 0x100) {
1841 printk(KERN_INFO
1842 "apm: battery flag 0x%02x, battery life ",
1843 (cx >> 8) & 0xff);
1844 if (dx == 0xffff)
1845 printk("unknown\n");
1846 else
1847 printk("%d %s\n", dx & 0x7fff,
1848 (dx & 0x8000) ?
1849 "minutes" : "seconds");
1850 }
1851 }
1852 }
1853
1854 /* Install our power off handler.. */
1855 if (power_off)
1856 pm_power_off = apm_power_off;
1857
1858 if (num_online_cpus() == 1 || smp) {
1859 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1860 console_blank_hook = apm_console_blank;
1861 #endif
1862 apm_mainloop();
1863 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1864 console_blank_hook = NULL;
1865 #endif
1866 }
1867
1868 return 0;
1869 }
1870
1871 #ifndef MODULE
1872 static int __init apm_setup(char *str)
1873 {
1874 int invert;
1875
1876 while ((str != NULL) && (*str != '\0')) {
1877 if (strncmp(str, "off", 3) == 0)
1878 apm_disabled = 1;
1879 if (strncmp(str, "on", 2) == 0)
1880 apm_disabled = 0;
1881 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1882 (strncmp(str, "bounce_interval=", 16) == 0))
1883 bounce_interval = simple_strtol(str + 16, NULL, 0);
1884 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1885 (strncmp(str, "idle_threshold=", 15) == 0))
1886 idle_threshold = simple_strtol(str + 15, NULL, 0);
1887 if ((strncmp(str, "idle-period=", 12) == 0) ||
1888 (strncmp(str, "idle_period=", 12) == 0))
1889 idle_period = simple_strtol(str + 12, NULL, 0);
1890 invert = (strncmp(str, "no-", 3) == 0) ||
1891 (strncmp(str, "no_", 3) == 0);
1892 if (invert)
1893 str += 3;
1894 if (strncmp(str, "debug", 5) == 0)
1895 debug = !invert;
1896 if ((strncmp(str, "power-off", 9) == 0) ||
1897 (strncmp(str, "power_off", 9) == 0))
1898 power_off = !invert;
1899 if (strncmp(str, "smp", 3) == 0) {
1900 smp = !invert;
1901 idle_threshold = 100;
1902 }
1903 if ((strncmp(str, "allow-ints", 10) == 0) ||
1904 (strncmp(str, "allow_ints", 10) == 0))
1905 apm_info.allow_ints = !invert;
1906 if ((strncmp(str, "broken-psr", 10) == 0) ||
1907 (strncmp(str, "broken_psr", 10) == 0))
1908 apm_info.get_power_status_broken = !invert;
1909 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1910 (strncmp(str, "realmode_power_off", 18) == 0))
1911 apm_info.realmode_power_off = !invert;
1912 str = strchr(str, ',');
1913 if (str != NULL)
1914 str += strspn(str, ", \t");
1915 }
1916 return 1;
1917 }
1918
1919 __setup("apm=", apm_setup);
1920 #endif
1921
1922 static const struct file_operations apm_bios_fops = {
1923 .owner = THIS_MODULE,
1924 .read = do_read,
1925 .poll = do_poll,
1926 .unlocked_ioctl = do_ioctl,
1927 .open = do_open,
1928 .release = do_release,
1929 .llseek = noop_llseek,
1930 };
1931
1932 static struct miscdevice apm_device = {
1933 APM_MINOR_DEV,
1934 "apm_bios",
1935 &apm_bios_fops
1936 };
1937
1938
1939 /* Simple "print if true" callback */
1940 static int __init print_if_true(const struct dmi_system_id *d)
1941 {
1942 printk("%s\n", d->ident);
1943 return 0;
1944 }
1945
1946 /*
1947 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1948 * disabled before the suspend. Linux used to get terribly confused by that.
1949 */
1950 static int __init broken_ps2_resume(const struct dmi_system_id *d)
1951 {
1952 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1953 "workaround hopefully not needed.\n", d->ident);
1954 return 0;
1955 }
1956
1957 /* Some bioses have a broken protected mode poweroff and need to use realmode */
1958 static int __init set_realmode_power_off(const struct dmi_system_id *d)
1959 {
1960 if (apm_info.realmode_power_off == 0) {
1961 apm_info.realmode_power_off = 1;
1962 printk(KERN_INFO "%s bios detected. "
1963 "Using realmode poweroff only.\n", d->ident);
1964 }
1965 return 0;
1966 }
1967
1968 /* Some laptops require interrupts to be enabled during APM calls */
1969 static int __init set_apm_ints(const struct dmi_system_id *d)
1970 {
1971 if (apm_info.allow_ints == 0) {
1972 apm_info.allow_ints = 1;
1973 printk(KERN_INFO "%s machine detected. "
1974 "Enabling interrupts during APM calls.\n", d->ident);
1975 }
1976 return 0;
1977 }
1978
1979 /* Some APM bioses corrupt memory or just plain do not work */
1980 static int __init apm_is_horked(const struct dmi_system_id *d)
1981 {
1982 if (apm_info.disabled == 0) {
1983 apm_info.disabled = 1;
1984 printk(KERN_INFO "%s machine detected. "
1985 "Disabling APM.\n", d->ident);
1986 }
1987 return 0;
1988 }
1989
1990 static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1991 {
1992 if (apm_info.disabled == 0) {
1993 apm_info.disabled = 1;
1994 printk(KERN_INFO "%s machine detected. "
1995 "Disabling APM.\n", d->ident);
1996 printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
1997 printk(KERN_INFO "download from support.intel.com\n");
1998 }
1999 return 0;
2000 }
2001
2002 /* Some APM bioses hang on APM idle calls */
2003 static int __init apm_likes_to_melt(const struct dmi_system_id *d)
2004 {
2005 if (apm_info.forbid_idle == 0) {
2006 apm_info.forbid_idle = 1;
2007 printk(KERN_INFO "%s machine detected. "
2008 "Disabling APM idle calls.\n", d->ident);
2009 }
2010 return 0;
2011 }
2012
2013 /*
2014 * Check for clue free BIOS implementations who use
2015 * the following QA technique
2016 *
2017 * [ Write BIOS Code ]<------
2018 * | ^
2019 * < Does it Compile >----N--
2020 * |Y ^
2021 * < Does it Boot Win98 >-N--
2022 * |Y
2023 * [Ship It]
2024 *
2025 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
2026 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
2027 */
2028 static int __init broken_apm_power(const struct dmi_system_id *d)
2029 {
2030 apm_info.get_power_status_broken = 1;
2031 printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2032 "disabling power status reporting.\n");
2033 return 0;
2034 }
2035
2036 /*
2037 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2038 * have this problem).
2039 */
2040 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2041 {
2042 apm_info.get_power_status_swabinminutes = 1;
2043 printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2044 "in minutes and wrong byte order.\n");
2045 return 0;
2046 }
2047
2048 static struct dmi_system_id __initdata apm_dmi_table[] = {
2049 {
2050 print_if_true,
2051 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2052 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2053 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2054 },
2055 { /* Handle problems with APM on the C600 */
2056 broken_ps2_resume, "Dell Latitude C600",
2057 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2058 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2059 },
2060 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2061 set_apm_ints, "Dell Latitude",
2062 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2063 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2064 },
2065 { /* APM crashes */
2066 apm_is_horked, "Dell Inspiron 2500",
2067 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2068 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2069 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2070 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2071 },
2072 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2073 set_apm_ints, "Dell Inspiron", {
2074 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2075 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2076 },
2077 { /* Handle problems with APM on Inspiron 5000e */
2078 broken_apm_power, "Dell Inspiron 5000e",
2079 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2080 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2081 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2082 },
2083 { /* Handle problems with APM on Inspiron 2500 */
2084 broken_apm_power, "Dell Inspiron 2500",
2085 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2086 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2087 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2088 },
2089 { /* APM crashes */
2090 apm_is_horked, "Dell Dimension 4100",
2091 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2092 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2093 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2094 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2095 },
2096 { /* Allow interrupts during suspend on Compaq Laptops*/
2097 set_apm_ints, "Compaq 12XL125",
2098 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2099 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2100 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2101 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2102 },
2103 { /* Allow interrupts during APM or the clock goes slow */
2104 set_apm_ints, "ASUSTeK",
2105 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2106 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2107 },
2108 { /* APM blows on shutdown */
2109 apm_is_horked, "ABIT KX7-333[R]",
2110 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2111 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2112 },
2113 { /* APM crashes */
2114 apm_is_horked, "Trigem Delhi3",
2115 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2116 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2117 },
2118 { /* APM crashes */
2119 apm_is_horked, "Fujitsu-Siemens",
2120 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2121 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2122 },
2123 { /* APM crashes */
2124 apm_is_horked_d850md, "Intel D850MD",
2125 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2126 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2127 },
2128 { /* APM crashes */
2129 apm_is_horked, "Intel D810EMO",
2130 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2131 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2132 },
2133 { /* APM crashes */
2134 apm_is_horked, "Dell XPS-Z",
2135 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2136 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2137 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2138 },
2139 { /* APM crashes */
2140 apm_is_horked, "Sharp PC-PJ/AX",
2141 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2142 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2143 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2144 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2145 },
2146 { /* APM crashes */
2147 apm_is_horked, "Dell Inspiron 2500",
2148 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2149 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2150 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2151 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2152 },
2153 { /* APM idle hangs */
2154 apm_likes_to_melt, "Jabil AMD",
2155 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2156 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2157 },
2158 { /* APM idle hangs */
2159 apm_likes_to_melt, "AMI Bios",
2160 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2161 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2162 },
2163 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2164 swab_apm_power_in_minutes, "Sony VAIO",
2165 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2166 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2167 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2168 },
2169 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2170 swab_apm_power_in_minutes, "Sony VAIO",
2171 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2172 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2173 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2174 },
2175 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2176 swab_apm_power_in_minutes, "Sony VAIO",
2177 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2178 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2179 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2180 },
2181 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2182 swab_apm_power_in_minutes, "Sony VAIO",
2183 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2184 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2185 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2186 },
2187 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2188 swab_apm_power_in_minutes, "Sony VAIO",
2189 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2190 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2191 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2192 },
2193 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2194 swab_apm_power_in_minutes, "Sony VAIO",
2195 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2196 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2197 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2198 },
2199 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2200 swab_apm_power_in_minutes, "Sony VAIO",
2201 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2202 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2203 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2204 },
2205 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2206 swab_apm_power_in_minutes, "Sony VAIO",
2207 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2208 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2209 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2210 },
2211 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2212 swab_apm_power_in_minutes, "Sony VAIO",
2213 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2214 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2215 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2216 },
2217 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2218 swab_apm_power_in_minutes, "Sony VAIO",
2219 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2220 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2221 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2222 },
2223
2224 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2225 swab_apm_power_in_minutes, "Sony VAIO",
2226 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2227 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2228 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2229 },
2230 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2231 swab_apm_power_in_minutes, "Sony VAIO",
2232 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2233 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2234 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2235 },
2236 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2237 swab_apm_power_in_minutes, "Sony VAIO",
2238 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2239 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2240 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2241 },
2242 { /* broken PM poweroff bios */
2243 set_realmode_power_off, "Award Software v4.60 PGMA",
2244 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2245 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2246 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2247 },
2248
2249 /* Generic per vendor APM settings */
2250
2251 { /* Allow interrupts during suspend on IBM laptops */
2252 set_apm_ints, "IBM",
2253 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2254 },
2255
2256 { }
2257 };
2258
2259 /*
2260 * Just start the APM thread. We do NOT want to do APM BIOS
2261 * calls from anything but the APM thread, if for no other reason
2262 * than the fact that we don't trust the APM BIOS. This way,
2263 * most common APM BIOS problems that lead to protection errors
2264 * etc will have at least some level of being contained...
2265 *
2266 * In short, if something bad happens, at least we have a choice
2267 * of just killing the apm thread..
2268 */
2269 static int __init apm_init(void)
2270 {
2271 struct desc_struct *gdt;
2272 int err;
2273
2274 dmi_check_system(apm_dmi_table);
2275
2276 if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) {
2277 printk(KERN_INFO "apm: BIOS not found.\n");
2278 return -ENODEV;
2279 }
2280 printk(KERN_INFO
2281 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2282 ((apm_info.bios.version >> 8) & 0xff),
2283 (apm_info.bios.version & 0xff),
2284 apm_info.bios.flags,
2285 driver_version);
2286 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2287 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2288 return -ENODEV;
2289 }
2290
2291 if (allow_ints)
2292 apm_info.allow_ints = 1;
2293 if (broken_psr)
2294 apm_info.get_power_status_broken = 1;
2295 if (realmode_power_off)
2296 apm_info.realmode_power_off = 1;
2297 /* User can override, but default is to trust DMI */
2298 if (apm_disabled != -1)
2299 apm_info.disabled = apm_disabled;
2300
2301 /*
2302 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2303 * but is reportedly a 1.0 BIOS.
2304 */
2305 if (apm_info.bios.version == 0x001)
2306 apm_info.bios.version = 0x100;
2307
2308 /* BIOS < 1.2 doesn't set cseg_16_len */
2309 if (apm_info.bios.version < 0x102)
2310 apm_info.bios.cseg_16_len = 0; /* 64k */
2311
2312 if (debug) {
2313 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2314 apm_info.bios.cseg, apm_info.bios.offset,
2315 apm_info.bios.cseg_16, apm_info.bios.dseg);
2316 if (apm_info.bios.version > 0x100)
2317 printk(" cseg len %x, dseg len %x",
2318 apm_info.bios.cseg_len,
2319 apm_info.bios.dseg_len);
2320 if (apm_info.bios.version > 0x101)
2321 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2322 printk("\n");
2323 }
2324
2325 if (apm_info.disabled) {
2326 printk(KERN_NOTICE "apm: disabled on user request.\n");
2327 return -ENODEV;
2328 }
2329 if ((num_online_cpus() > 1) && !power_off && !smp) {
2330 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2331 apm_info.disabled = 1;
2332 return -ENODEV;
2333 }
2334 if (pm_flags & PM_ACPI) {
2335 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2336 apm_info.disabled = 1;
2337 return -ENODEV;
2338 }
2339 pm_flags |= PM_APM;
2340
2341 /*
2342 * Set up the long jump entry point to the APM BIOS, which is called
2343 * from inline assembly.
2344 */
2345 apm_bios_entry.offset = apm_info.bios.offset;
2346 apm_bios_entry.segment = APM_CS;
2347
2348 /*
2349 * The APM 1.1 BIOS is supposed to provide limit information that it
2350 * recognizes. Many machines do this correctly, but many others do
2351 * not restrict themselves to their claimed limit. When this happens,
2352 * they will cause a segmentation violation in the kernel at boot time.
2353 * Most BIOS's, however, will respect a 64k limit, so we use that.
2354 *
2355 * Note we only set APM segments on CPU zero, since we pin the APM
2356 * code to that CPU.
2357 */
2358 gdt = get_cpu_gdt_table(0);
2359 set_desc_base(&gdt[APM_CS >> 3],
2360 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2361 set_desc_base(&gdt[APM_CS_16 >> 3],
2362 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2363 set_desc_base(&gdt[APM_DS >> 3],
2364 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2365
2366 proc_create("apm", 0, NULL, &apm_file_ops);
2367
2368 kapmd_task = kthread_create(apm, NULL, "kapmd");
2369 if (IS_ERR(kapmd_task)) {
2370 printk(KERN_ERR "apm: disabled - Unable to start kernel "
2371 "thread.\n");
2372 err = PTR_ERR(kapmd_task);
2373 kapmd_task = NULL;
2374 remove_proc_entry("apm", NULL);
2375 return err;
2376 }
2377 wake_up_process(kapmd_task);
2378
2379 if (num_online_cpus() > 1 && !smp) {
2380 printk(KERN_NOTICE
2381 "apm: disabled - APM is not SMP safe (power off active).\n");
2382 return 0;
2383 }
2384
2385 /*
2386 * Note we don't actually care if the misc_device cannot be registered.
2387 * this driver can do its job without it, even if userspace can't
2388 * control it. just log the error
2389 */
2390 if (misc_register(&apm_device))
2391 printk(KERN_WARNING "apm: Could not register misc device.\n");
2392
2393 if (HZ != 100)
2394 idle_period = (idle_period * HZ) / 100;
2395 if (idle_threshold < 100) {
2396 original_pm_idle = pm_idle;
2397 pm_idle = apm_cpu_idle;
2398 set_pm_idle = 1;
2399 }
2400
2401 return 0;
2402 }
2403
2404 static void __exit apm_exit(void)
2405 {
2406 int error;
2407
2408 if (set_pm_idle) {
2409 pm_idle = original_pm_idle;
2410 /*
2411 * We are about to unload the current idle thread pm callback
2412 * (pm_idle), Wait for all processors to update cached/local
2413 * copies of pm_idle before proceeding.
2414 */
2415 cpu_idle_wait();
2416 }
2417 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2418 && (apm_info.connection_version > 0x0100)) {
2419 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2420 if (error)
2421 apm_error("disengage power management", error);
2422 }
2423 misc_deregister(&apm_device);
2424 remove_proc_entry("apm", NULL);
2425 if (power_off)
2426 pm_power_off = NULL;
2427 if (kapmd_task) {
2428 kthread_stop(kapmd_task);
2429 kapmd_task = NULL;
2430 }
2431 pm_flags &= ~PM_APM;
2432 }
2433
2434 module_init(apm_init);
2435 module_exit(apm_exit);
2436
2437 MODULE_AUTHOR("Stephen Rothwell");
2438 MODULE_DESCRIPTION("Advanced Power Management");
2439 MODULE_LICENSE("GPL");
2440 module_param(debug, bool, 0644);
2441 MODULE_PARM_DESC(debug, "Enable debug mode");
2442 module_param(power_off, bool, 0444);
2443 MODULE_PARM_DESC(power_off, "Enable power off");
2444 module_param(bounce_interval, int, 0444);
2445 MODULE_PARM_DESC(bounce_interval,
2446 "Set the number of ticks to ignore suspend bounces");
2447 module_param(allow_ints, bool, 0444);
2448 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2449 module_param(broken_psr, bool, 0444);
2450 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2451 module_param(realmode_power_off, bool, 0444);
2452 MODULE_PARM_DESC(realmode_power_off,
2453 "Switch to real mode before powering off");
2454 module_param(idle_threshold, int, 0444);
2455 MODULE_PARM_DESC(idle_threshold,
2456 "System idle percentage above which to make APM BIOS idle calls");
2457 module_param(idle_period, int, 0444);
2458 MODULE_PARM_DESC(idle_period,
2459 "Period (in sec/100) over which to caculate the idle percentage");
2460 module_param(smp, bool, 0444);
2461 MODULE_PARM_DESC(smp,
2462 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2463 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree