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Linux 3.8-rc7
[cris-mirror.git] / arch / x86 / kernel / apm_32.c
blobd65464e4350343c9d379aa6d44a1ed03a1ca1f2c
1 /* -*- linux-c -*-
2 * APM BIOS driver for Linux
3 * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
4 *
5 * Initial development of this driver was funded by NEC Australia P/L
6 * and NEC Corporation
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2, or (at your option) any
11 * later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * October 1995, Rik Faith (faith@cs.unc.edu):
19 * Minor enhancements and updates (to the patch set) for 1.3.x
20 * Documentation
21 * January 1996, Rik Faith (faith@cs.unc.edu):
22 * Make /proc/apm easy to format (bump driver version)
23 * March 1996, Rik Faith (faith@cs.unc.edu):
24 * Prohibit APM BIOS calls unless apm_enabled.
25 * (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>)
26 * April 1996, Stephen Rothwell (sfr@canb.auug.org.au)
27 * Version 1.0 and 1.1
28 * May 1996, Version 1.2
29 * Feb 1998, Version 1.3
30 * Feb 1998, Version 1.4
31 * Aug 1998, Version 1.5
32 * Sep 1998, Version 1.6
33 * Nov 1998, Version 1.7
34 * Jan 1999, Version 1.8
35 * Jan 1999, Version 1.9
36 * Oct 1999, Version 1.10
37 * Nov 1999, Version 1.11
38 * Jan 2000, Version 1.12
39 * Feb 2000, Version 1.13
40 * Nov 2000, Version 1.14
41 * Oct 2001, Version 1.15
42 * Jan 2002, Version 1.16
43 * Oct 2002, Version 1.16ac
44 *
45 * History:
46 * 0.6b: first version in official kernel, Linux 1.3.46
47 * 0.7: changed /proc/apm format, Linux 1.3.58
48 * 0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59
49 * 0.9: only call bios if bios is present, Linux 1.3.72
50 * 1.0: use fixed device number, consolidate /proc/apm into this file,
51 * Linux 1.3.85
52 * 1.1: support user-space standby and suspend, power off after system
53 * halted, Linux 1.3.98
54 * 1.2: When resetting RTC after resume, take care so that the time
55 * is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
56 * <jtoth@princeton.edu>); improve interaction between
57 * screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
58 * 1.2a:Simple change to stop mysterious bug reports with SMP also added
59 * levels to the printk calls. APM is not defined for SMP machines.
60 * The new replacement for it is, but Linux doesn't yet support this.
61 * Alan Cox Linux 2.1.55
62 * 1.3: Set up a valid data descriptor 0x40 for buggy BIOS's
63 * 1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by
64 * Dean Gaudet <dgaudet@arctic.org>.
65 * C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87
66 * 1.5: Fix segment register reloading (in case of bad segments saved
67 * across BIOS call).
68 * Stephen Rothwell
69 * 1.6: Cope with compiler/assembler differences.
70 * Only try to turn off the first display device.
71 * Fix OOPS at power off with no APM BIOS by Jan Echternach
72 * <echter@informatik.uni-rostock.de>
73 * Stephen Rothwell
74 * 1.7: Modify driver's cached copy of the disabled/disengaged flags
75 * to reflect current state of APM BIOS.
76 * Chris Rankin <rankinc@bellsouth.net>
77 * Reset interrupt 0 timer to 100Hz after suspend
78 * Chad Miller <cmiller@surfsouth.com>
79 * Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
80 * Richard Gooch <rgooch@atnf.csiro.au>
81 * Allow boot time disabling of APM
82 * Make boot messages far less verbose by default
83 * Make asm safer
84 * Stephen Rothwell
85 * 1.8: Add CONFIG_APM_RTC_IS_GMT
86 * Richard Gooch <rgooch@atnf.csiro.au>
87 * change APM_NOINTS to CONFIG_APM_ALLOW_INTS
88 * remove dependency on CONFIG_PROC_FS
89 * Stephen Rothwell
90 * 1.9: Fix small typo. <laslo@wodip.opole.pl>
91 * Try to cope with BIOS's that need to have all display
92 * devices blanked and not just the first one.
93 * Ross Paterson <ross@soi.city.ac.uk>
94 * Fix segment limit setting it has always been wrong as
95 * the segments needed to have byte granularity.
96 * Mark a few things __init.
97 * Add hack to allow power off of SMP systems by popular request.
98 * Use CONFIG_SMP instead of __SMP__
99 * Ignore BOUNCES for three seconds.
100 * Stephen Rothwell
101 * 1.10: Fix for Thinkpad return code.
102 * Merge 2.2 and 2.3 drivers.
103 * Remove APM dependencies in arch/i386/kernel/process.c
104 * Remove APM dependencies in drivers/char/sysrq.c
105 * Reset time across standby.
106 * Allow more inititialisation on SMP.
107 * Remove CONFIG_APM_POWER_OFF and make it boot time
108 * configurable (default on).
109 * Make debug only a boot time parameter (remove APM_DEBUG).
110 * Try to blank all devices on any error.
111 * 1.11: Remove APM dependencies in drivers/char/console.c
112 * Check nr_running to detect if we are idle (from
113 * Borislav Deianov <borislav@lix.polytechnique.fr>)
114 * Fix for bioses that don't zero the top part of the
115 * entrypoint offset (Mario Sitta <sitta@al.unipmn.it>)
116 * (reported by Panos Katsaloulis <teras@writeme.com>).
117 * Real mode power off patch (Walter Hofmann
118 * <Walter.Hofmann@physik.stud.uni-erlangen.de>).
119 * 1.12: Remove CONFIG_SMP as the compiler will optimize
120 * the code away anyway (smp_num_cpus == 1 in UP)
121 * noted by Artur Skawina <skawina@geocities.com>.
122 * Make power off under SMP work again.
123 * Fix thinko with initial engaging of BIOS.
124 * Make sure power off only happens on CPU 0
125 * (Paul "Rusty" Russell <rusty@rustcorp.com.au>).
126 * Do error notification to user mode if BIOS calls fail.
127 * Move entrypoint offset fix to ...boot/setup.S
128 * where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>).
129 * Remove smp-power-off. SMP users must now specify
130 * "apm=power-off" on the kernel command line. Suggested
131 * by Jim Avera <jima@hal.com>, modified by Alan Cox
132 * <alan@lxorguk.ukuu.org.uk>.
133 * Register the /proc/apm entry even on SMP so that
134 * scripts that check for it before doing power off
135 * work (Jim Avera <jima@hal.com>).
136 * 1.13: Changes for new pm_ interfaces (Andy Henroid
137 * <andy_henroid@yahoo.com>).
138 * Modularize the code.
139 * Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS
140 * is now the way life works).
141 * Fix thinko in suspend() (wrong return).
142 * Notify drivers on critical suspend.
143 * Make kapmd absorb more idle time (Pavel Machek <pavel@ucw.cz>
144 * modified by sfr).
145 * Disable interrupts while we are suspended (Andy Henroid
146 * <andy_henroid@yahoo.com> fixed by sfr).
147 * Make power off work on SMP again (Tony Hoyle
148 * <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr.
149 * Remove CONFIG_APM_SUSPEND_BOUNCE. The bounce ignore
150 * interval is now configurable.
151 * 1.14: Make connection version persist across module unload/load.
152 * Enable and engage power management earlier.
153 * Disengage power management on module unload.
154 * Changed to use the sysrq-register hack for registering the
155 * power off function called by magic sysrq based upon discussions
156 * in irc://irc.openprojects.net/#kernelnewbies
157 * (Crutcher Dunnavant <crutcher+kernel@datastacks.com>).
158 * Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable.
159 * (Arjan van de Ven <arjanv@redhat.com>) modified by sfr.
160 * Work around byte swap bug in one of the Vaio's BIOS's
161 * (Marc Boucher <marc@mbsi.ca>).
162 * Exposed the disable flag to dmi so that we can handle known
163 * broken APM (Alan Cox <alan@lxorguk.ukuu.org.uk>).
164 * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
165 * calling it - instead idle. (Alan Cox <alan@lxorguk.ukuu.org.uk>)
166 * If an APM idle fails log it and idle sensibly
167 * 1.15: Don't queue events to clients who open the device O_WRONLY.
168 * Don't expect replies from clients who open the device O_RDONLY.
169 * (Idea from Thomas Hood)
170 * Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>)
171 * 1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.)
172 * Notify listeners of standby or suspend events before notifying
173 * drivers. Return EBUSY to ioctl() if suspend is rejected.
174 * (Russell King <rmk@arm.linux.org.uk> and Thomas Hood)
175 * Ignore first resume after we generate our own resume event
176 * after a suspend (Thomas Hood)
177 * Daemonize now gets rid of our controlling terminal (sfr).
178 * CONFIG_APM_CPU_IDLE now just affects the default value of
179 * idle_threshold (sfr).
180 * Change name of kernel apm daemon (as it no longer idles) (sfr).
181 * 1.16ac: Fix up SMP support somewhat. You can now force SMP on and we
182 * make _all_ APM calls on the CPU#0. Fix unsafe sign bug.
183 * TODO: determine if its "boot CPU" or "CPU0" we want to lock to.
184 *
185 * APM 1.1 Reference:
186 *
187 * Intel Corporation, Microsoft Corporation. Advanced Power Management
188 * (APM) BIOS Interface Specification, Revision 1.1, September 1993.
189 * Intel Order Number 241704-001. Microsoft Part Number 781-110-X01.
190 *
191 * [This document is available free from Intel by calling 800.628.8686 (fax
192 * 916.356.6100) or 800.548.4725; or from
193 * http://www.microsoft.com/whdc/archive/amp_12.mspx It is also
194 * available from Microsoft by calling 206.882.8080.]
195 *
196 * APM 1.2 Reference:
197 * Intel Corporation, Microsoft Corporation. Advanced Power Management
198 * (APM) BIOS Interface Specification, Revision 1.2, February 1996.
199 *
200 * [This document is available from Microsoft at:
201 * http://www.microsoft.com/whdc/archive/amp_12.mspx]
202 */
203
204 #define pr_fmt(fmt) "apm: " fmt
205
206 #include <linux/module.h>
207
208 #include <linux/poll.h>
209 #include <linux/types.h>
210 #include <linux/stddef.h>
211 #include <linux/timer.h>
212 #include <linux/fcntl.h>
213 #include <linux/slab.h>
214 #include <linux/stat.h>
215 #include <linux/proc_fs.h>
216 #include <linux/seq_file.h>
217 #include <linux/miscdevice.h>
218 #include <linux/apm_bios.h>
219 #include <linux/init.h>
220 #include <linux/time.h>
221 #include <linux/sched.h>
222 #include <linux/pm.h>
223 #include <linux/capability.h>
224 #include <linux/device.h>
225 #include <linux/kernel.h>
226 #include <linux/freezer.h>
227 #include <linux/smp.h>
228 #include <linux/dmi.h>
229 #include <linux/suspend.h>
230 #include <linux/kthread.h>
231 #include <linux/jiffies.h>
232 #include <linux/acpi.h>
233 #include <linux/syscore_ops.h>
234 #include <linux/i8253.h>
235
236 #include <asm/uaccess.h>
237 #include <asm/desc.h>
238 #include <asm/olpc.h>
239 #include <asm/paravirt.h>
240 #include <asm/reboot.h>
241
242 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
243 extern int (*console_blank_hook)(int);
244 #endif
245
246 /*
247 * The apm_bios device is one of the misc char devices.
248 * This is its minor number.
249 */
250 #define APM_MINOR_DEV 134
251
252 /*
253 * Various options can be changed at boot time as follows:
254 * (We allow underscores for compatibility with the modules code)
255 * apm=on/off enable/disable APM
256 * [no-]allow[-_]ints allow interrupts during BIOS calls
257 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
258 * [no-]realmode[-_]power[-_]off switch to real mode before
259 * powering off
260 * [no-]debug log some debugging messages
261 * [no-]power[-_]off power off on shutdown
262 * [no-]smp Use apm even on an SMP box
263 * bounce[-_]interval=<n> number of ticks to ignore suspend
264 * bounces
265 * idle[-_]threshold=<n> System idle percentage above which to
266 * make APM BIOS idle calls. Set it to
267 * 100 to disable.
268 * idle[-_]period=<n> Period (in 1/100s of a second) over
269 * which the idle percentage is
270 * calculated.
271 */
272
273 /* KNOWN PROBLEM MACHINES:
274 *
275 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
276 * [Confirmed by TI representative]
277 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
278 * [Confirmed by BIOS disassembly]
279 * [This may work now ...]
280 * P: Toshiba 1950S: battery life information only gets updated after resume
281 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
282 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
283 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
284 * Neale Banks <neale@lowendale.com.au> December 2000
285 *
286 * Legend: U = unusable with APM patches
287 * P = partially usable with APM patches
288 */
289
290 /*
291 * Define as 1 to make the driver always call the APM BIOS busy
292 * routine even if the clock was not reported as slowed by the
293 * idle routine. Otherwise, define as 0.
294 */
295 #define ALWAYS_CALL_BUSY 1
296
297 /*
298 * Define to make the APM BIOS calls zero all data segment registers (so
299 * that an incorrect BIOS implementation will cause a kernel panic if it
300 * tries to write to arbitrary memory).
301 */
302 #define APM_ZERO_SEGS
303
304 #include <asm/apm.h>
305
306 /*
307 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
308 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
309 * David Chen <chen@ctpa04.mit.edu>
310 */
311 #undef INIT_TIMER_AFTER_SUSPEND
312
313 #ifdef INIT_TIMER_AFTER_SUSPEND
314 #include <linux/timex.h>
315 #include <asm/io.h>
316 #include <linux/delay.h>
317 #endif
318
319 /*
320 * Need to poll the APM BIOS every second
321 */
322 #define APM_CHECK_TIMEOUT (HZ)
323
324 /*
325 * Ignore suspend events for this amount of time after a resume
326 */
327 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
328
329 /*
330 * Maximum number of events stored
331 */
332 #define APM_MAX_EVENTS 20
333
334 /*
335 * The per-file APM data
336 */
337 struct apm_user {
338 int magic;
339 struct apm_user *next;
340 unsigned int suser: 1;
341 unsigned int writer: 1;
342 unsigned int reader: 1;
343 unsigned int suspend_wait: 1;
344 int suspend_result;
345 int suspends_pending;
346 int standbys_pending;
347 int suspends_read;
348 int standbys_read;
349 int event_head;
350 int event_tail;
351 apm_event_t events[APM_MAX_EVENTS];
352 };
353
354 /*
355 * The magic number in apm_user
356 */
357 #define APM_BIOS_MAGIC 0x4101
358
359 /*
360 * idle percentage above which bios idle calls are done
361 */
362 #ifdef CONFIG_APM_CPU_IDLE
363 #warning deprecated CONFIG_APM_CPU_IDLE will be deleted in 2012
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 static bool debug __read_mostly;
388 static bool smp __read_mostly;
389 static int apm_disabled = -1;
390 #ifdef CONFIG_SMP
391 static bool power_off;
392 #else
393 static bool power_off = 1;
394 #endif
395 static bool realmode_power_off;
396 #ifdef CONFIG_APM_ALLOW_INTS
397 static bool allow_ints = 1;
398 #else
399 static bool allow_ints;
400 #endif
401 static bool broken_psr;
402
403 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
404 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
405 static struct apm_user *user_list;
406 static DEFINE_SPINLOCK(user_list_lock);
407 static DEFINE_MUTEX(apm_mutex);
408
409 /*
410 * Set up a segment that references the real mode segment 0x40
411 * that extends up to the end of page zero (that we have reserved).
412 * This is for buggy BIOS's that refer to (real mode) segment 0x40
413 * even though they are called in protected mode.
414 */
415 static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
416 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
417
418 static const char driver_version[] = "1.16ac"; /* no spaces */
419
420 static struct task_struct *kapmd_task;
421
422 /*
423 * APM event names taken from the APM 1.2 specification. These are
424 * the message codes that the BIOS uses to tell us about events
425 */
426 static const char * const apm_event_name[] = {
427 "system standby",
428 "system suspend",
429 "normal resume",
430 "critical resume",
431 "low battery",
432 "power status change",
433 "update time",
434 "critical suspend",
435 "user standby",
436 "user suspend",
437 "system standby resume",
438 "capabilities change"
439 };
440 #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
441
442 typedef struct lookup_t {
443 int key;
444 char *msg;
445 } lookup_t;
446
447 /*
448 * The BIOS returns a set of standard error codes in AX when the
449 * carry flag is set.
450 */
451
452 static const lookup_t error_table[] = {
453 /* N/A { APM_SUCCESS, "Operation succeeded" }, */
454 { APM_DISABLED, "Power management disabled" },
455 { APM_CONNECTED, "Real mode interface already connected" },
456 { APM_NOT_CONNECTED, "Interface not connected" },
457 { APM_16_CONNECTED, "16 bit interface already connected" },
458 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
459 { APM_32_CONNECTED, "32 bit interface already connected" },
460 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
461 { APM_BAD_DEVICE, "Unrecognized device ID" },
462 { APM_BAD_PARAM, "Parameter out of range" },
463 { APM_NOT_ENGAGED, "Interface not engaged" },
464 { APM_BAD_FUNCTION, "Function not supported" },
465 { APM_RESUME_DISABLED, "Resume timer disabled" },
466 { APM_BAD_STATE, "Unable to enter requested state" },
467 /* N/A { APM_NO_EVENTS, "No events pending" }, */
468 { APM_NO_ERROR, "BIOS did not set a return code" },
469 { APM_NOT_PRESENT, "No APM present" }
470 };
471 #define ERROR_COUNT ARRAY_SIZE(error_table)
472
473 /**
474 * apm_error - display an APM error
475 * @str: information string
476 * @err: APM BIOS return code
477 *
478 * Write a meaningful log entry to the kernel log in the event of
479 * an APM error. Note that this also handles (negative) kernel errors.
480 */
481
482 static void apm_error(char *str, int err)
483 {
484 int i;
485
486 for (i = 0; i < ERROR_COUNT; i++)
487 if (error_table[i].key == err)
488 break;
489 if (i < ERROR_COUNT)
490 pr_notice("%s: %s\n", str, error_table[i].msg);
491 else if (err < 0)
492 pr_notice("%s: linux error code %i\n", str, err);
493 else
494 pr_notice("%s: unknown error code %#2.2x\n",
495 str, err);
496 }
497
498 /*
499 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
500 * apm_info.allow_ints, we are being really paranoid here! Not only
501 * are interrupts disabled, but all the segment registers (except SS)
502 * are saved and zeroed this means that if the BIOS tries to reference
503 * any data without explicitly loading the segment registers, the kernel
504 * will fault immediately rather than have some unforeseen circumstances
505 * for the rest of the kernel. And it will be very obvious! :-) Doing
506 * this depends on CS referring to the same physical memory as DS so that
507 * DS can be zeroed before the call. Unfortunately, we can't do anything
508 * about the stack segment/pointer. Also, we tell the compiler that
509 * everything could change.
510 *
511 * Also, we KNOW that for the non error case of apm_bios_call, there
512 * is no useful data returned in the low order 8 bits of eax.
513 */
514
515 static inline unsigned long __apm_irq_save(void)
516 {
517 unsigned long flags;
518 local_save_flags(flags);
519 if (apm_info.allow_ints) {
520 if (irqs_disabled_flags(flags))
521 local_irq_enable();
522 } else
523 local_irq_disable();
524
525 return flags;
526 }
527
528 #define apm_irq_save(flags) \
529 do { flags = __apm_irq_save(); } while (0)
530
531 static inline void apm_irq_restore(unsigned long flags)
532 {
533 if (irqs_disabled_flags(flags))
534 local_irq_disable();
535 else if (irqs_disabled())
536 local_irq_enable();
537 }
538
539 #ifdef APM_ZERO_SEGS
540 # define APM_DECL_SEGS \
541 unsigned int saved_fs; unsigned int saved_gs;
542 # define APM_DO_SAVE_SEGS \
543 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
544 # define APM_DO_RESTORE_SEGS \
545 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
546 #else
547 # define APM_DECL_SEGS
548 # define APM_DO_SAVE_SEGS
549 # define APM_DO_RESTORE_SEGS
550 #endif
551
552 struct apm_bios_call {
553 u32 func;
554 /* In and out */
555 u32 ebx;
556 u32 ecx;
557 /* Out only */
558 u32 eax;
559 u32 edx;
560 u32 esi;
561
562 /* Error: -ENOMEM, or bits 8-15 of eax */
563 int err;
564 };
565
566 /**
567 * __apm_bios_call - Make an APM BIOS 32bit call
568 * @_call: pointer to struct apm_bios_call.
569 *
570 * Make an APM call using the 32bit protected mode interface. The
571 * caller is responsible for knowing if APM BIOS is configured and
572 * enabled. This call can disable interrupts for a long period of
573 * time on some laptops. The return value is in AH and the carry
574 * flag is loaded into AL. If there is an error, then the error
575 * code is returned in AH (bits 8-15 of eax) and this function
576 * returns non-zero.
577 *
578 * Note: this makes the call on the current CPU.
579 */
580 static long __apm_bios_call(void *_call)
581 {
582 APM_DECL_SEGS
583 unsigned long flags;
584 int cpu;
585 struct desc_struct save_desc_40;
586 struct desc_struct *gdt;
587 struct apm_bios_call *call = _call;
588
589 cpu = get_cpu();
590 BUG_ON(cpu != 0);
591 gdt = get_cpu_gdt_table(cpu);
592 save_desc_40 = gdt[0x40 / 8];
593 gdt[0x40 / 8] = bad_bios_desc;
594
595 apm_irq_save(flags);
596 APM_DO_SAVE_SEGS;
597 apm_bios_call_asm(call->func, call->ebx, call->ecx,
598 &call->eax, &call->ebx, &call->ecx, &call->edx,
599 &call->esi);
600 APM_DO_RESTORE_SEGS;
601 apm_irq_restore(flags);
602 gdt[0x40 / 8] = save_desc_40;
603 put_cpu();
604
605 return call->eax & 0xff;
606 }
607
608 /* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
609 static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
610 {
611 int ret;
612
613 /* Don't bother with work_on_cpu in the common case, so we don't
614 * have to worry about OOM or overhead. */
615 if (get_cpu() == 0) {
616 ret = fn(call);
617 put_cpu();
618 } else {
619 put_cpu();
620 ret = work_on_cpu(0, fn, call);
621 }
622
623 /* work_on_cpu can fail with -ENOMEM */
624 if (ret < 0)
625 call->err = ret;
626 else
627 call->err = (call->eax >> 8) & 0xff;
628
629 return ret;
630 }
631
632 /**
633 * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0)
634 * @call: the apm_bios_call registers.
635 *
636 * If there is an error, it is returned in @call.err.
637 */
638 static int apm_bios_call(struct apm_bios_call *call)
639 {
640 return on_cpu0(__apm_bios_call, call);
641 }
642
643 /**
644 * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
645 * @_call: pointer to struct apm_bios_call.
646 *
647 * Make a BIOS call that returns one value only, or just status.
648 * If there is an error, then the error code is returned in AH
649 * (bits 8-15 of eax) and this function returns non-zero (it can
650 * also return -ENOMEM). This is used for simpler BIOS operations.
651 * This call may hold interrupts off for a long time on some laptops.
652 *
653 * Note: this makes the call on the current CPU.
654 */
655 static long __apm_bios_call_simple(void *_call)
656 {
657 u8 error;
658 APM_DECL_SEGS
659 unsigned long flags;
660 int cpu;
661 struct desc_struct save_desc_40;
662 struct desc_struct *gdt;
663 struct apm_bios_call *call = _call;
664
665 cpu = get_cpu();
666 BUG_ON(cpu != 0);
667 gdt = get_cpu_gdt_table(cpu);
668 save_desc_40 = gdt[0x40 / 8];
669 gdt[0x40 / 8] = bad_bios_desc;
670
671 apm_irq_save(flags);
672 APM_DO_SAVE_SEGS;
673 error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
674 &call->eax);
675 APM_DO_RESTORE_SEGS;
676 apm_irq_restore(flags);
677 gdt[0x40 / 8] = save_desc_40;
678 put_cpu();
679 return error;
680 }
681
682 /**
683 * apm_bios_call_simple - make a simple APM BIOS 32bit call
684 * @func: APM function to invoke
685 * @ebx_in: EBX register value for BIOS call
686 * @ecx_in: ECX register value for BIOS call
687 * @eax: EAX register on return from the BIOS call
688 * @err: bits
689 *
690 * Make a BIOS call that returns one value only, or just status.
691 * If there is an error, then the error code is returned in @err
692 * and this function returns non-zero. This is used for simpler
693 * BIOS operations. This call may hold interrupts off for a long
694 * time on some laptops.
695 */
696 static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
697 int *err)
698 {
699 struct apm_bios_call call;
700 int ret;
701
702 call.func = func;
703 call.ebx = ebx_in;
704 call.ecx = ecx_in;
705
706 ret = on_cpu0(__apm_bios_call_simple, &call);
707 *eax = call.eax;
708 *err = call.err;
709 return ret;
710 }
711
712 /**
713 * apm_driver_version - APM driver version
714 * @val: loaded with the APM version on return
715 *
716 * Retrieve the APM version supported by the BIOS. This is only
717 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
718 * probably present.
719 *
720 * On entry val should point to a value indicating the APM driver
721 * version with the high byte being the major and the low byte the
722 * minor number both in BCD
723 *
724 * On return it will hold the BIOS revision supported in the
725 * same format.
726 */
727
728 static int apm_driver_version(u_short *val)
729 {
730 u32 eax;
731 int err;
732
733 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
734 return err;
735 *val = eax;
736 return APM_SUCCESS;
737 }
738
739 /**
740 * apm_get_event - get an APM event from the BIOS
741 * @event: pointer to the event
742 * @info: point to the event information
743 *
744 * The APM BIOS provides a polled information for event
745 * reporting. The BIOS expects to be polled at least every second
746 * when events are pending. When a message is found the caller should
747 * poll until no more messages are present. However, this causes
748 * problems on some laptops where a suspend event notification is
749 * not cleared until it is acknowledged.
750 *
751 * Additional information is returned in the info pointer, providing
752 * that APM 1.2 is in use. If no messges are pending the value 0x80
753 * is returned (No power management events pending).
754 */
755 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
756 {
757 struct apm_bios_call call;
758
759 call.func = APM_FUNC_GET_EVENT;
760 call.ebx = call.ecx = 0;
761
762 if (apm_bios_call(&call))
763 return call.err;
764
765 *event = call.ebx;
766 if (apm_info.connection_version < 0x0102)
767 *info = ~0; /* indicate info not valid */
768 else
769 *info = call.ecx;
770 return APM_SUCCESS;
771 }
772
773 /**
774 * set_power_state - set the power management state
775 * @what: which items to transition
776 * @state: state to transition to
777 *
778 * Request an APM change of state for one or more system devices. The
779 * processor state must be transitioned last of all. what holds the
780 * class of device in the upper byte and the device number (0xFF for
781 * all) for the object to be transitioned.
782 *
783 * The state holds the state to transition to, which may in fact
784 * be an acceptance of a BIOS requested state change.
785 */
786
787 static int set_power_state(u_short what, u_short state)
788 {
789 u32 eax;
790 int err;
791
792 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
793 return err;
794 return APM_SUCCESS;
795 }
796
797 /**
798 * set_system_power_state - set system wide power state
799 * @state: which state to enter
800 *
801 * Transition the entire system into a new APM power state.
802 */
803
804 static int set_system_power_state(u_short state)
805 {
806 return set_power_state(APM_DEVICE_ALL, state);
807 }
808
809 /**
810 * apm_do_idle - perform power saving
811 *
812 * This function notifies the BIOS that the processor is (in the view
813 * of the OS) idle. It returns -1 in the event that the BIOS refuses
814 * to handle the idle request. On a success the function returns 1
815 * if the BIOS did clock slowing or 0 otherwise.
816 */
817
818 static int apm_do_idle(void)
819 {
820 u32 eax;
821 u8 ret = 0;
822 int idled = 0;
823 int polling;
824 int err = 0;
825
826 polling = !!(current_thread_info()->status & TS_POLLING);
827 if (polling) {
828 current_thread_info()->status &= ~TS_POLLING;
829 /*
830 * TS_POLLING-cleared state must be visible before we
831 * test NEED_RESCHED:
832 */
833 smp_mb();
834 }
835 if (!need_resched()) {
836 idled = 1;
837 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
838 }
839 if (polling)
840 current_thread_info()->status |= TS_POLLING;
841
842 if (!idled)
843 return 0;
844
845 if (ret) {
846 static unsigned long t;
847
848 /* This always fails on some SMP boards running UP kernels.
849 * Only report the failure the first 5 times.
850 */
851 if (++t < 5) {
852 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
853 t = jiffies;
854 }
855 return -1;
856 }
857 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
858 return clock_slowed;
859 }
860
861 /**
862 * apm_do_busy - inform the BIOS the CPU is busy
863 *
864 * Request that the BIOS brings the CPU back to full performance.
865 */
866
867 static void apm_do_busy(void)
868 {
869 u32 dummy;
870 int err;
871
872 if (clock_slowed || ALWAYS_CALL_BUSY) {
873 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
874 clock_slowed = 0;
875 }
876 }
877
878 /*
879 * If no process has really been interested in
880 * the CPU for some time, we want to call BIOS
881 * power management - we probably want
882 * to conserve power.
883 */
884 #define IDLE_CALC_LIMIT (HZ * 100)
885 #define IDLE_LEAKY_MAX 16
886
887 static void (*original_pm_idle)(void) __read_mostly;
888
889 /**
890 * apm_cpu_idle - cpu idling for APM capable Linux
891 *
892 * This is the idling function the kernel executes when APM is available. It
893 * tries to do BIOS powermanagement based on the average system idle time.
894 * Furthermore it calls the system default idle routine.
895 */
896
897 static void apm_cpu_idle(void)
898 {
899 static int use_apm_idle; /* = 0 */
900 static unsigned int last_jiffies; /* = 0 */
901 static unsigned int last_stime; /* = 0 */
902
903 int apm_idle_done = 0;
904 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
905 unsigned int bucket;
906
907 WARN_ONCE(1, "deprecated apm_cpu_idle will be deleted in 2012");
908 recalc:
909 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
910 use_apm_idle = 0;
911 last_jiffies = jiffies;
912 last_stime = current->stime;
913 } else if (jiffies_since_last_check > idle_period) {
914 unsigned int idle_percentage;
915
916 idle_percentage = current->stime - last_stime;
917 idle_percentage *= 100;
918 idle_percentage /= jiffies_since_last_check;
919 use_apm_idle = (idle_percentage > idle_threshold);
920 if (apm_info.forbid_idle)
921 use_apm_idle = 0;
922 last_jiffies = jiffies;
923 last_stime = current->stime;
924 }
925
926 bucket = IDLE_LEAKY_MAX;
927
928 while (!need_resched()) {
929 if (use_apm_idle) {
930 unsigned int t;
931
932 t = jiffies;
933 switch (apm_do_idle()) {
934 case 0:
935 apm_idle_done = 1;
936 if (t != jiffies) {
937 if (bucket) {
938 bucket = IDLE_LEAKY_MAX;
939 continue;
940 }
941 } else if (bucket) {
942 bucket--;
943 continue;
944 }
945 break;
946 case 1:
947 apm_idle_done = 1;
948 break;
949 default: /* BIOS refused */
950 break;
951 }
952 }
953 if (original_pm_idle)
954 original_pm_idle();
955 else
956 default_idle();
957 local_irq_disable();
958 jiffies_since_last_check = jiffies - last_jiffies;
959 if (jiffies_since_last_check > idle_period)
960 goto recalc;
961 }
962
963 if (apm_idle_done)
964 apm_do_busy();
965
966 local_irq_enable();
967 }
968
969 /**
970 * apm_power_off - ask the BIOS to power off
971 *
972 * Handle the power off sequence. This is the one piece of code we
973 * will execute even on SMP machines. In order to deal with BIOS
974 * bugs we support real mode APM BIOS power off calls. We also make
975 * the SMP call on CPU0 as some systems will only honour this call
976 * on their first cpu.
977 */
978
979 static void apm_power_off(void)
980 {
981 /* Some bioses don't like being called from CPU != 0 */
982 if (apm_info.realmode_power_off) {
983 set_cpus_allowed_ptr(current, cpumask_of(0));
984 machine_real_restart(MRR_APM);
985 } else {
986 (void)set_system_power_state(APM_STATE_OFF);
987 }
988 }
989
990 #ifdef CONFIG_APM_DO_ENABLE
991
992 /**
993 * apm_enable_power_management - enable BIOS APM power management
994 * @enable: enable yes/no
995 *
996 * Enable or disable the APM BIOS power services.
997 */
998
999 static int apm_enable_power_management(int enable)
1000 {
1001 u32 eax;
1002 int err;
1003
1004 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1005 return APM_NOT_ENGAGED;
1006 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1007 enable, &eax, &err))
1008 return err;
1009 if (enable)
1010 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1011 else
1012 apm_info.bios.flags |= APM_BIOS_DISABLED;
1013 return APM_SUCCESS;
1014 }
1015 #endif
1016
1017 /**
1018 * apm_get_power_status - get current power state
1019 * @status: returned status
1020 * @bat: battery info
1021 * @life: estimated life
1022 *
1023 * Obtain the current power status from the APM BIOS. We return a
1024 * status which gives the rough battery status, and current power
1025 * source. The bat value returned give an estimate as a percentage
1026 * of life and a status value for the battery. The estimated life
1027 * if reported is a lifetime in secodnds/minutes at current powwer
1028 * consumption.
1029 */
1030
1031 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1032 {
1033 struct apm_bios_call call;
1034
1035 call.func = APM_FUNC_GET_STATUS;
1036 call.ebx = APM_DEVICE_ALL;
1037 call.ecx = 0;
1038
1039 if (apm_info.get_power_status_broken)
1040 return APM_32_UNSUPPORTED;
1041 if (apm_bios_call(&call))
1042 return call.err;
1043 *status = call.ebx;
1044 *bat = call.ecx;
1045 if (apm_info.get_power_status_swabinminutes) {
1046 *life = swab16((u16)call.edx);
1047 *life |= 0x8000;
1048 } else
1049 *life = call.edx;
1050 return APM_SUCCESS;
1051 }
1052
1053 #if 0
1054 static int apm_get_battery_status(u_short which, u_short *status,
1055 u_short *bat, u_short *life, u_short *nbat)
1056 {
1057 u32 eax;
1058 u32 ebx;
1059 u32 ecx;
1060 u32 edx;
1061 u32 esi;
1062
1063 if (apm_info.connection_version < 0x0102) {
1064 /* pretend we only have one battery. */
1065 if (which != 1)
1066 return APM_BAD_DEVICE;
1067 *nbat = 1;
1068 return apm_get_power_status(status, bat, life);
1069 }
1070
1071 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1072 &ebx, &ecx, &edx, &esi))
1073 return (eax >> 8) & 0xff;
1074 *status = ebx;
1075 *bat = ecx;
1076 *life = edx;
1077 *nbat = esi;
1078 return APM_SUCCESS;
1079 }
1080 #endif
1081
1082 /**
1083 * apm_engage_power_management - enable PM on a device
1084 * @device: identity of device
1085 * @enable: on/off
1086 *
1087 * Activate or deactive power management on either a specific device
1088 * or the entire system (%APM_DEVICE_ALL).
1089 */
1090
1091 static int apm_engage_power_management(u_short device, int enable)
1092 {
1093 u32 eax;
1094 int err;
1095
1096 if ((enable == 0) && (device == APM_DEVICE_ALL)
1097 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1098 return APM_DISABLED;
1099 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1100 &eax, &err))
1101 return err;
1102 if (device == APM_DEVICE_ALL) {
1103 if (enable)
1104 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1105 else
1106 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1107 }
1108 return APM_SUCCESS;
1109 }
1110
1111 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1112
1113 /**
1114 * apm_console_blank - blank the display
1115 * @blank: on/off
1116 *
1117 * Attempt to blank the console, firstly by blanking just video device
1118 * zero, and if that fails (some BIOSes don't support it) then it blanks
1119 * all video devices. Typically the BIOS will do laptop backlight and
1120 * monitor powerdown for us.
1121 */
1122
1123 static int apm_console_blank(int blank)
1124 {
1125 int error = APM_NOT_ENGAGED; /* silence gcc */
1126 int i;
1127 u_short state;
1128 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1129
1130 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1131
1132 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1133 error = set_power_state(dev[i], state);
1134
1135 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1136 return 1;
1137
1138 if (error == APM_NOT_ENGAGED)
1139 break;
1140 }
1141
1142 if (error == APM_NOT_ENGAGED) {
1143 static int tried;
1144 int eng_error;
1145 if (tried++ == 0) {
1146 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1147 if (eng_error) {
1148 apm_error("set display", error);
1149 apm_error("engage interface", eng_error);
1150 return 0;
1151 } else
1152 return apm_console_blank(blank);
1153 }
1154 }
1155 apm_error("set display", error);
1156 return 0;
1157 }
1158 #endif
1159
1160 static int queue_empty(struct apm_user *as)
1161 {
1162 return as->event_head == as->event_tail;
1163 }
1164
1165 static apm_event_t get_queued_event(struct apm_user *as)
1166 {
1167 if (++as->event_tail >= APM_MAX_EVENTS)
1168 as->event_tail = 0;
1169 return as->events[as->event_tail];
1170 }
1171
1172 static void queue_event(apm_event_t event, struct apm_user *sender)
1173 {
1174 struct apm_user *as;
1175
1176 spin_lock(&user_list_lock);
1177 if (user_list == NULL)
1178 goto out;
1179 for (as = user_list; as != NULL; as = as->next) {
1180 if ((as == sender) || (!as->reader))
1181 continue;
1182 if (++as->event_head >= APM_MAX_EVENTS)
1183 as->event_head = 0;
1184
1185 if (as->event_head == as->event_tail) {
1186 static int notified;
1187
1188 if (notified++ == 0)
1189 pr_err("an event queue overflowed\n");
1190 if (++as->event_tail >= APM_MAX_EVENTS)
1191 as->event_tail = 0;
1192 }
1193 as->events[as->event_head] = event;
1194 if (!as->suser || !as->writer)
1195 continue;
1196 switch (event) {
1197 case APM_SYS_SUSPEND:
1198 case APM_USER_SUSPEND:
1199 as->suspends_pending++;
1200 suspends_pending++;
1201 break;
1202
1203 case APM_SYS_STANDBY:
1204 case APM_USER_STANDBY:
1205 as->standbys_pending++;
1206 standbys_pending++;
1207 break;
1208 }
1209 }
1210 wake_up_interruptible(&apm_waitqueue);
1211 out:
1212 spin_unlock(&user_list_lock);
1213 }
1214
1215 static void reinit_timer(void)
1216 {
1217 #ifdef INIT_TIMER_AFTER_SUSPEND
1218 unsigned long flags;
1219
1220 raw_spin_lock_irqsave(&i8253_lock, flags);
1221 /* set the clock to HZ */
1222 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1223 udelay(10);
1224 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1225 udelay(10);
1226 outb_p(LATCH >> 8, PIT_CH0); /* MSB */
1227 udelay(10);
1228 raw_spin_unlock_irqrestore(&i8253_lock, flags);
1229 #endif
1230 }
1231
1232 static int suspend(int vetoable)
1233 {
1234 int err;
1235 struct apm_user *as;
1236
1237 dpm_suspend_start(PMSG_SUSPEND);
1238 dpm_suspend_end(PMSG_SUSPEND);
1239
1240 local_irq_disable();
1241 syscore_suspend();
1242
1243 local_irq_enable();
1244
1245 save_processor_state();
1246 err = set_system_power_state(APM_STATE_SUSPEND);
1247 ignore_normal_resume = 1;
1248 restore_processor_state();
1249
1250 local_irq_disable();
1251 reinit_timer();
1252
1253 if (err == APM_NO_ERROR)
1254 err = APM_SUCCESS;
1255 if (err != APM_SUCCESS)
1256 apm_error("suspend", err);
1257 err = (err == APM_SUCCESS) ? 0 : -EIO;
1258
1259 syscore_resume();
1260 local_irq_enable();
1261
1262 dpm_resume_start(PMSG_RESUME);
1263 dpm_resume_end(PMSG_RESUME);
1264
1265 queue_event(APM_NORMAL_RESUME, NULL);
1266 spin_lock(&user_list_lock);
1267 for (as = user_list; as != NULL; as = as->next) {
1268 as->suspend_wait = 0;
1269 as->suspend_result = err;
1270 }
1271 spin_unlock(&user_list_lock);
1272 wake_up_interruptible(&apm_suspend_waitqueue);
1273 return err;
1274 }
1275
1276 static void standby(void)
1277 {
1278 int err;
1279
1280 dpm_suspend_end(PMSG_SUSPEND);
1281
1282 local_irq_disable();
1283 syscore_suspend();
1284 local_irq_enable();
1285
1286 err = set_system_power_state(APM_STATE_STANDBY);
1287 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1288 apm_error("standby", err);
1289
1290 local_irq_disable();
1291 syscore_resume();
1292 local_irq_enable();
1293
1294 dpm_resume_start(PMSG_RESUME);
1295 }
1296
1297 static apm_event_t get_event(void)
1298 {
1299 int error;
1300 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1301 apm_eventinfo_t info;
1302
1303 static int notified;
1304
1305 /* we don't use the eventinfo */
1306 error = apm_get_event(&event, &info);
1307 if (error == APM_SUCCESS)
1308 return event;
1309
1310 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1311 apm_error("get_event", error);
1312
1313 return 0;
1314 }
1315
1316 static void check_events(void)
1317 {
1318 apm_event_t event;
1319 static unsigned long last_resume;
1320 static int ignore_bounce;
1321
1322 while ((event = get_event()) != 0) {
1323 if (debug) {
1324 if (event <= NR_APM_EVENT_NAME)
1325 printk(KERN_DEBUG "apm: received %s notify\n",
1326 apm_event_name[event - 1]);
1327 else
1328 printk(KERN_DEBUG "apm: received unknown "
1329 "event 0x%02x\n", event);
1330 }
1331 if (ignore_bounce
1332 && (time_after(jiffies, last_resume + bounce_interval)))
1333 ignore_bounce = 0;
1334
1335 switch (event) {
1336 case APM_SYS_STANDBY:
1337 case APM_USER_STANDBY:
1338 queue_event(event, NULL);
1339 if (standbys_pending <= 0)
1340 standby();
1341 break;
1342
1343 case APM_USER_SUSPEND:
1344 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1345 if (apm_info.connection_version > 0x100)
1346 set_system_power_state(APM_STATE_REJECT);
1347 break;
1348 #endif
1349 case APM_SYS_SUSPEND:
1350 if (ignore_bounce) {
1351 if (apm_info.connection_version > 0x100)
1352 set_system_power_state(APM_STATE_REJECT);
1353 break;
1354 }
1355 /*
1356 * If we are already processing a SUSPEND,
1357 * then further SUSPEND events from the BIOS
1358 * will be ignored. We also return here to
1359 * cope with the fact that the Thinkpads keep
1360 * sending a SUSPEND event until something else
1361 * happens!
1362 */
1363 if (ignore_sys_suspend)
1364 return;
1365 ignore_sys_suspend = 1;
1366 queue_event(event, NULL);
1367 if (suspends_pending <= 0)
1368 (void) suspend(1);
1369 break;
1370
1371 case APM_NORMAL_RESUME:
1372 case APM_CRITICAL_RESUME:
1373 case APM_STANDBY_RESUME:
1374 ignore_sys_suspend = 0;
1375 last_resume = jiffies;
1376 ignore_bounce = 1;
1377 if ((event != APM_NORMAL_RESUME)
1378 || (ignore_normal_resume == 0)) {
1379 dpm_resume_end(PMSG_RESUME);
1380 queue_event(event, NULL);
1381 }
1382 ignore_normal_resume = 0;
1383 break;
1384
1385 case APM_CAPABILITY_CHANGE:
1386 case APM_LOW_BATTERY:
1387 case APM_POWER_STATUS_CHANGE:
1388 queue_event(event, NULL);
1389 /* If needed, notify drivers here */
1390 break;
1391
1392 case APM_UPDATE_TIME:
1393 break;
1394
1395 case APM_CRITICAL_SUSPEND:
1396 /*
1397 * We are not allowed to reject a critical suspend.
1398 */
1399 (void)suspend(0);
1400 break;
1401 }
1402 }
1403 }
1404
1405 static void apm_event_handler(void)
1406 {
1407 static int pending_count = 4;
1408 int err;
1409
1410 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1411 if ((apm_info.connection_version > 0x100) &&
1412 (pending_count-- <= 0)) {
1413 pending_count = 4;
1414 if (debug)
1415 printk(KERN_DEBUG "apm: setting state busy\n");
1416 err = set_system_power_state(APM_STATE_BUSY);
1417 if (err)
1418 apm_error("busy", err);
1419 }
1420 } else
1421 pending_count = 4;
1422 check_events();
1423 }
1424
1425 /*
1426 * This is the APM thread main loop.
1427 */
1428
1429 static void apm_mainloop(void)
1430 {
1431 DECLARE_WAITQUEUE(wait, current);
1432
1433 add_wait_queue(&apm_waitqueue, &wait);
1434 set_current_state(TASK_INTERRUPTIBLE);
1435 for (;;) {
1436 schedule_timeout(APM_CHECK_TIMEOUT);
1437 if (kthread_should_stop())
1438 break;
1439 /*
1440 * Ok, check all events, check for idle (and mark us sleeping
1441 * so as not to count towards the load average)..
1442 */
1443 set_current_state(TASK_INTERRUPTIBLE);
1444 apm_event_handler();
1445 }
1446 remove_wait_queue(&apm_waitqueue, &wait);
1447 }
1448
1449 static int check_apm_user(struct apm_user *as, const char *func)
1450 {
1451 if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1452 pr_err("%s passed bad filp\n", func);
1453 return 1;
1454 }
1455 return 0;
1456 }
1457
1458 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1459 {
1460 struct apm_user *as;
1461 int i;
1462 apm_event_t event;
1463
1464 as = fp->private_data;
1465 if (check_apm_user(as, "read"))
1466 return -EIO;
1467 if ((int)count < sizeof(apm_event_t))
1468 return -EINVAL;
1469 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1470 return -EAGAIN;
1471 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1472 i = count;
1473 while ((i >= sizeof(event)) && !queue_empty(as)) {
1474 event = get_queued_event(as);
1475 if (copy_to_user(buf, &event, sizeof(event))) {
1476 if (i < count)
1477 break;
1478 return -EFAULT;
1479 }
1480 switch (event) {
1481 case APM_SYS_SUSPEND:
1482 case APM_USER_SUSPEND:
1483 as->suspends_read++;
1484 break;
1485
1486 case APM_SYS_STANDBY:
1487 case APM_USER_STANDBY:
1488 as->standbys_read++;
1489 break;
1490 }
1491 buf += sizeof(event);
1492 i -= sizeof(event);
1493 }
1494 if (i < count)
1495 return count - i;
1496 if (signal_pending(current))
1497 return -ERESTARTSYS;
1498 return 0;
1499 }
1500
1501 static unsigned int do_poll(struct file *fp, poll_table *wait)
1502 {
1503 struct apm_user *as;
1504
1505 as = fp->private_data;
1506 if (check_apm_user(as, "poll"))
1507 return 0;
1508 poll_wait(fp, &apm_waitqueue, wait);
1509 if (!queue_empty(as))
1510 return POLLIN | POLLRDNORM;
1511 return 0;
1512 }
1513
1514 static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1515 {
1516 struct apm_user *as;
1517 int ret;
1518
1519 as = filp->private_data;
1520 if (check_apm_user(as, "ioctl"))
1521 return -EIO;
1522 if (!as->suser || !as->writer)
1523 return -EPERM;
1524 switch (cmd) {
1525 case APM_IOC_STANDBY:
1526 mutex_lock(&apm_mutex);
1527 if (as->standbys_read > 0) {
1528 as->standbys_read--;
1529 as->standbys_pending--;
1530 standbys_pending--;
1531 } else
1532 queue_event(APM_USER_STANDBY, as);
1533 if (standbys_pending <= 0)
1534 standby();
1535 mutex_unlock(&apm_mutex);
1536 break;
1537 case APM_IOC_SUSPEND:
1538 mutex_lock(&apm_mutex);
1539 if (as->suspends_read > 0) {
1540 as->suspends_read--;
1541 as->suspends_pending--;
1542 suspends_pending--;
1543 } else
1544 queue_event(APM_USER_SUSPEND, as);
1545 if (suspends_pending <= 0) {
1546 ret = suspend(1);
1547 mutex_unlock(&apm_mutex);
1548 } else {
1549 as->suspend_wait = 1;
1550 mutex_unlock(&apm_mutex);
1551 wait_event_interruptible(apm_suspend_waitqueue,
1552 as->suspend_wait == 0);
1553 ret = as->suspend_result;
1554 }
1555 return ret;
1556 default:
1557 return -ENOTTY;
1558 }
1559 return 0;
1560 }
1561
1562 static int do_release(struct inode *inode, struct file *filp)
1563 {
1564 struct apm_user *as;
1565
1566 as = filp->private_data;
1567 if (check_apm_user(as, "release"))
1568 return 0;
1569 filp->private_data = NULL;
1570 if (as->standbys_pending > 0) {
1571 standbys_pending -= as->standbys_pending;
1572 if (standbys_pending <= 0)
1573 standby();
1574 }
1575 if (as->suspends_pending > 0) {
1576 suspends_pending -= as->suspends_pending;
1577 if (suspends_pending <= 0)
1578 (void) suspend(1);
1579 }
1580 spin_lock(&user_list_lock);
1581 if (user_list == as)
1582 user_list = as->next;
1583 else {
1584 struct apm_user *as1;
1585
1586 for (as1 = user_list;
1587 (as1 != NULL) && (as1->next != as);
1588 as1 = as1->next)
1589 ;
1590 if (as1 == NULL)
1591 pr_err("filp not in user list\n");
1592 else
1593 as1->next = as->next;
1594 }
1595 spin_unlock(&user_list_lock);
1596 kfree(as);
1597 return 0;
1598 }
1599
1600 static int do_open(struct inode *inode, struct file *filp)
1601 {
1602 struct apm_user *as;
1603
1604 as = kmalloc(sizeof(*as), GFP_KERNEL);
1605 if (as == NULL)
1606 return -ENOMEM;
1607
1608 as->magic = APM_BIOS_MAGIC;
1609 as->event_tail = as->event_head = 0;
1610 as->suspends_pending = as->standbys_pending = 0;
1611 as->suspends_read = as->standbys_read = 0;
1612 /*
1613 * XXX - this is a tiny bit broken, when we consider BSD
1614 * process accounting. If the device is opened by root, we
1615 * instantly flag that we used superuser privs. Who knows,
1616 * we might close the device immediately without doing a
1617 * privileged operation -- cevans
1618 */
1619 as->suser = capable(CAP_SYS_ADMIN);
1620 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1621 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1622 spin_lock(&user_list_lock);
1623 as->next = user_list;
1624 user_list = as;
1625 spin_unlock(&user_list_lock);
1626 filp->private_data = as;
1627 return 0;
1628 }
1629
1630 static int proc_apm_show(struct seq_file *m, void *v)
1631 {
1632 unsigned short bx;
1633 unsigned short cx;
1634 unsigned short dx;
1635 int error;
1636 unsigned short ac_line_status = 0xff;
1637 unsigned short battery_status = 0xff;
1638 unsigned short battery_flag = 0xff;
1639 int percentage = -1;
1640 int time_units = -1;
1641 char *units = "?";
1642
1643 if ((num_online_cpus() == 1) &&
1644 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1645 ac_line_status = (bx >> 8) & 0xff;
1646 battery_status = bx & 0xff;
1647 if ((cx & 0xff) != 0xff)
1648 percentage = cx & 0xff;
1649
1650 if (apm_info.connection_version > 0x100) {
1651 battery_flag = (cx >> 8) & 0xff;
1652 if (dx != 0xffff) {
1653 units = (dx & 0x8000) ? "min" : "sec";
1654 time_units = dx & 0x7fff;
1655 }
1656 }
1657 }
1658 /* Arguments, with symbols from linux/apm_bios.h. Information is
1659 from the Get Power Status (0x0a) call unless otherwise noted.
1660
1661 0) Linux driver version (this will change if format changes)
1662 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1663 2) APM flags from APM Installation Check (0x00):
1664 bit 0: APM_16_BIT_SUPPORT
1665 bit 1: APM_32_BIT_SUPPORT
1666 bit 2: APM_IDLE_SLOWS_CLOCK
1667 bit 3: APM_BIOS_DISABLED
1668 bit 4: APM_BIOS_DISENGAGED
1669 3) AC line status
1670 0x00: Off-line
1671 0x01: On-line
1672 0x02: On backup power (BIOS >= 1.1 only)
1673 0xff: Unknown
1674 4) Battery status
1675 0x00: High
1676 0x01: Low
1677 0x02: Critical
1678 0x03: Charging
1679 0x04: Selected battery not present (BIOS >= 1.2 only)
1680 0xff: Unknown
1681 5) Battery flag
1682 bit 0: High
1683 bit 1: Low
1684 bit 2: Critical
1685 bit 3: Charging
1686 bit 7: No system battery
1687 0xff: Unknown
1688 6) Remaining battery life (percentage of charge):
1689 0-100: valid
1690 -1: Unknown
1691 7) Remaining battery life (time units):
1692 Number of remaining minutes or seconds
1693 -1: Unknown
1694 8) min = minutes; sec = seconds */
1695
1696 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1697 driver_version,
1698 (apm_info.bios.version >> 8) & 0xff,
1699 apm_info.bios.version & 0xff,
1700 apm_info.bios.flags,
1701 ac_line_status,
1702 battery_status,
1703 battery_flag,
1704 percentage,
1705 time_units,
1706 units);
1707 return 0;
1708 }
1709
1710 static int proc_apm_open(struct inode *inode, struct file *file)
1711 {
1712 return single_open(file, proc_apm_show, NULL);
1713 }
1714
1715 static const struct file_operations apm_file_ops = {
1716 .owner = THIS_MODULE,
1717 .open = proc_apm_open,
1718 .read = seq_read,
1719 .llseek = seq_lseek,
1720 .release = single_release,
1721 };
1722
1723 static int apm(void *unused)
1724 {
1725 unsigned short bx;
1726 unsigned short cx;
1727 unsigned short dx;
1728 int error;
1729 char *power_stat;
1730 char *bat_stat;
1731
1732 /* 2002/08/01 - WT
1733 * This is to avoid random crashes at boot time during initialization
1734 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1735 * Some bioses don't like being called from CPU != 0.
1736 * Method suggested by Ingo Molnar.
1737 */
1738 set_cpus_allowed_ptr(current, cpumask_of(0));
1739 BUG_ON(smp_processor_id() != 0);
1740
1741 if (apm_info.connection_version == 0) {
1742 apm_info.connection_version = apm_info.bios.version;
1743 if (apm_info.connection_version > 0x100) {
1744 /*
1745 * We only support BIOSs up to version 1.2
1746 */
1747 if (apm_info.connection_version > 0x0102)
1748 apm_info.connection_version = 0x0102;
1749 error = apm_driver_version(&apm_info.connection_version);
1750 if (error != APM_SUCCESS) {
1751 apm_error("driver version", error);
1752 /* Fall back to an APM 1.0 connection. */
1753 apm_info.connection_version = 0x100;
1754 }
1755 }
1756 }
1757
1758 if (debug)
1759 printk(KERN_INFO "apm: Connection version %d.%d\n",
1760 (apm_info.connection_version >> 8) & 0xff,
1761 apm_info.connection_version & 0xff);
1762
1763 #ifdef CONFIG_APM_DO_ENABLE
1764 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1765 /*
1766 * This call causes my NEC UltraLite Versa 33/C to hang if it
1767 * is booted with PM disabled but not in the docking station.
1768 * Unfortunate ...
1769 */
1770 error = apm_enable_power_management(1);
1771 if (error) {
1772 apm_error("enable power management", error);
1773 return -1;
1774 }
1775 }
1776 #endif
1777
1778 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1779 && (apm_info.connection_version > 0x0100)) {
1780 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1781 if (error) {
1782 apm_error("engage power management", error);
1783 return -1;
1784 }
1785 }
1786
1787 if (debug && (num_online_cpus() == 1 || smp)) {
1788 error = apm_get_power_status(&bx, &cx, &dx);
1789 if (error)
1790 printk(KERN_INFO "apm: power status not available\n");
1791 else {
1792 switch ((bx >> 8) & 0xff) {
1793 case 0:
1794 power_stat = "off line";
1795 break;
1796 case 1:
1797 power_stat = "on line";
1798 break;
1799 case 2:
1800 power_stat = "on backup power";
1801 break;
1802 default:
1803 power_stat = "unknown";
1804 break;
1805 }
1806 switch (bx & 0xff) {
1807 case 0:
1808 bat_stat = "high";
1809 break;
1810 case 1:
1811 bat_stat = "low";
1812 break;
1813 case 2:
1814 bat_stat = "critical";
1815 break;
1816 case 3:
1817 bat_stat = "charging";
1818 break;
1819 default:
1820 bat_stat = "unknown";
1821 break;
1822 }
1823 printk(KERN_INFO
1824 "apm: AC %s, battery status %s, battery life ",
1825 power_stat, bat_stat);
1826 if ((cx & 0xff) == 0xff)
1827 printk("unknown\n");
1828 else
1829 printk("%d%%\n", cx & 0xff);
1830 if (apm_info.connection_version > 0x100) {
1831 printk(KERN_INFO
1832 "apm: battery flag 0x%02x, battery life ",
1833 (cx >> 8) & 0xff);
1834 if (dx == 0xffff)
1835 printk("unknown\n");
1836 else
1837 printk("%d %s\n", dx & 0x7fff,
1838 (dx & 0x8000) ?
1839 "minutes" : "seconds");
1840 }
1841 }
1842 }
1843
1844 /* Install our power off handler.. */
1845 if (power_off)
1846 pm_power_off = apm_power_off;
1847
1848 if (num_online_cpus() == 1 || smp) {
1849 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1850 console_blank_hook = apm_console_blank;
1851 #endif
1852 apm_mainloop();
1853 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1854 console_blank_hook = NULL;
1855 #endif
1856 }
1857
1858 return 0;
1859 }
1860
1861 #ifndef MODULE
1862 static int __init apm_setup(char *str)
1863 {
1864 int invert;
1865
1866 while ((str != NULL) && (*str != '\0')) {
1867 if (strncmp(str, "off", 3) == 0)
1868 apm_disabled = 1;
1869 if (strncmp(str, "on", 2) == 0)
1870 apm_disabled = 0;
1871 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1872 (strncmp(str, "bounce_interval=", 16) == 0))
1873 bounce_interval = simple_strtol(str + 16, NULL, 0);
1874 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1875 (strncmp(str, "idle_threshold=", 15) == 0))
1876 idle_threshold = simple_strtol(str + 15, NULL, 0);
1877 if ((strncmp(str, "idle-period=", 12) == 0) ||
1878 (strncmp(str, "idle_period=", 12) == 0))
1879 idle_period = simple_strtol(str + 12, NULL, 0);
1880 invert = (strncmp(str, "no-", 3) == 0) ||
1881 (strncmp(str, "no_", 3) == 0);
1882 if (invert)
1883 str += 3;
1884 if (strncmp(str, "debug", 5) == 0)
1885 debug = !invert;
1886 if ((strncmp(str, "power-off", 9) == 0) ||
1887 (strncmp(str, "power_off", 9) == 0))
1888 power_off = !invert;
1889 if (strncmp(str, "smp", 3) == 0) {
1890 smp = !invert;
1891 idle_threshold = 100;
1892 }
1893 if ((strncmp(str, "allow-ints", 10) == 0) ||
1894 (strncmp(str, "allow_ints", 10) == 0))
1895 apm_info.allow_ints = !invert;
1896 if ((strncmp(str, "broken-psr", 10) == 0) ||
1897 (strncmp(str, "broken_psr", 10) == 0))
1898 apm_info.get_power_status_broken = !invert;
1899 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1900 (strncmp(str, "realmode_power_off", 18) == 0))
1901 apm_info.realmode_power_off = !invert;
1902 str = strchr(str, ',');
1903 if (str != NULL)
1904 str += strspn(str, ", \t");
1905 }
1906 return 1;
1907 }
1908
1909 __setup("apm=", apm_setup);
1910 #endif
1911
1912 static const struct file_operations apm_bios_fops = {
1913 .owner = THIS_MODULE,
1914 .read = do_read,
1915 .poll = do_poll,
1916 .unlocked_ioctl = do_ioctl,
1917 .open = do_open,
1918 .release = do_release,
1919 .llseek = noop_llseek,
1920 };
1921
1922 static struct miscdevice apm_device = {
1923 APM_MINOR_DEV,
1924 "apm_bios",
1925 &apm_bios_fops
1926 };
1927
1928
1929 /* Simple "print if true" callback */
1930 static int __init print_if_true(const struct dmi_system_id *d)
1931 {
1932 printk("%s\n", d->ident);
1933 return 0;
1934 }
1935
1936 /*
1937 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1938 * disabled before the suspend. Linux used to get terribly confused by that.
1939 */
1940 static int __init broken_ps2_resume(const struct dmi_system_id *d)
1941 {
1942 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1943 "workaround hopefully not needed.\n", d->ident);
1944 return 0;
1945 }
1946
1947 /* Some bioses have a broken protected mode poweroff and need to use realmode */
1948 static int __init set_realmode_power_off(const struct dmi_system_id *d)
1949 {
1950 if (apm_info.realmode_power_off == 0) {
1951 apm_info.realmode_power_off = 1;
1952 printk(KERN_INFO "%s bios detected. "
1953 "Using realmode poweroff only.\n", d->ident);
1954 }
1955 return 0;
1956 }
1957
1958 /* Some laptops require interrupts to be enabled during APM calls */
1959 static int __init set_apm_ints(const struct dmi_system_id *d)
1960 {
1961 if (apm_info.allow_ints == 0) {
1962 apm_info.allow_ints = 1;
1963 printk(KERN_INFO "%s machine detected. "
1964 "Enabling interrupts during APM calls.\n", d->ident);
1965 }
1966 return 0;
1967 }
1968
1969 /* Some APM bioses corrupt memory or just plain do not work */
1970 static int __init apm_is_horked(const struct dmi_system_id *d)
1971 {
1972 if (apm_info.disabled == 0) {
1973 apm_info.disabled = 1;
1974 printk(KERN_INFO "%s machine detected. "
1975 "Disabling APM.\n", d->ident);
1976 }
1977 return 0;
1978 }
1979
1980 static int __init apm_is_horked_d850md(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 printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
1987 printk(KERN_INFO "download from support.intel.com\n");
1988 }
1989 return 0;
1990 }
1991
1992 /* Some APM bioses hang on APM idle calls */
1993 static int __init apm_likes_to_melt(const struct dmi_system_id *d)
1994 {
1995 if (apm_info.forbid_idle == 0) {
1996 apm_info.forbid_idle = 1;
1997 printk(KERN_INFO "%s machine detected. "
1998 "Disabling APM idle calls.\n", d->ident);
1999 }
2000 return 0;
2001 }
2002
2003 /*
2004 * Check for clue free BIOS implementations who use
2005 * the following QA technique
2006 *
2007 * [ Write BIOS Code ]<------
2008 * | ^
2009 * < Does it Compile >----N--
2010 * |Y ^
2011 * < Does it Boot Win98 >-N--
2012 * |Y
2013 * [Ship It]
2014 *
2015 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
2016 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
2017 */
2018 static int __init broken_apm_power(const struct dmi_system_id *d)
2019 {
2020 apm_info.get_power_status_broken = 1;
2021 printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2022 "disabling power status reporting.\n");
2023 return 0;
2024 }
2025
2026 /*
2027 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2028 * have this problem).
2029 */
2030 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2031 {
2032 apm_info.get_power_status_swabinminutes = 1;
2033 printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2034 "in minutes and wrong byte order.\n");
2035 return 0;
2036 }
2037
2038 static struct dmi_system_id __initdata apm_dmi_table[] = {
2039 {
2040 print_if_true,
2041 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2042 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2043 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2044 },
2045 { /* Handle problems with APM on the C600 */
2046 broken_ps2_resume, "Dell Latitude C600",
2047 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2048 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2049 },
2050 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2051 set_apm_ints, "Dell Latitude",
2052 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2053 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2054 },
2055 { /* APM crashes */
2056 apm_is_horked, "Dell Inspiron 2500",
2057 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2058 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2059 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2060 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2061 },
2062 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2063 set_apm_ints, "Dell Inspiron", {
2064 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2065 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2066 },
2067 { /* Handle problems with APM on Inspiron 5000e */
2068 broken_apm_power, "Dell Inspiron 5000e",
2069 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2070 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2071 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2072 },
2073 { /* Handle problems with APM on Inspiron 2500 */
2074 broken_apm_power, "Dell Inspiron 2500",
2075 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2076 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2077 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2078 },
2079 { /* APM crashes */
2080 apm_is_horked, "Dell Dimension 4100",
2081 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2082 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2083 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2084 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2085 },
2086 { /* Allow interrupts during suspend on Compaq Laptops*/
2087 set_apm_ints, "Compaq 12XL125",
2088 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2089 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2090 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2091 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2092 },
2093 { /* Allow interrupts during APM or the clock goes slow */
2094 set_apm_ints, "ASUSTeK",
2095 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2096 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2097 },
2098 { /* APM blows on shutdown */
2099 apm_is_horked, "ABIT KX7-333[R]",
2100 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2101 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2102 },
2103 { /* APM crashes */
2104 apm_is_horked, "Trigem Delhi3",
2105 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2106 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2107 },
2108 { /* APM crashes */
2109 apm_is_horked, "Fujitsu-Siemens",
2110 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2111 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2112 },
2113 { /* APM crashes */
2114 apm_is_horked_d850md, "Intel D850MD",
2115 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2116 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2117 },
2118 { /* APM crashes */
2119 apm_is_horked, "Intel D810EMO",
2120 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2121 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2122 },
2123 { /* APM crashes */
2124 apm_is_horked, "Dell XPS-Z",
2125 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2126 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2127 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2128 },
2129 { /* APM crashes */
2130 apm_is_horked, "Sharp PC-PJ/AX",
2131 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2132 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2133 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2134 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2135 },
2136 { /* APM crashes */
2137 apm_is_horked, "Dell Inspiron 2500",
2138 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2139 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2140 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2141 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2142 },
2143 { /* APM idle hangs */
2144 apm_likes_to_melt, "Jabil AMD",
2145 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2146 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2147 },
2148 { /* APM idle hangs */
2149 apm_likes_to_melt, "AMI Bios",
2150 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2151 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2152 },
2153 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2154 swab_apm_power_in_minutes, "Sony VAIO",
2155 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2156 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2157 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2158 },
2159 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2160 swab_apm_power_in_minutes, "Sony VAIO",
2161 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2162 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2163 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2164 },
2165 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2166 swab_apm_power_in_minutes, "Sony VAIO",
2167 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2168 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2169 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2170 },
2171 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2172 swab_apm_power_in_minutes, "Sony VAIO",
2173 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2174 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2175 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2176 },
2177 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2178 swab_apm_power_in_minutes, "Sony VAIO",
2179 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2180 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2181 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2182 },
2183 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2184 swab_apm_power_in_minutes, "Sony VAIO",
2185 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2186 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2187 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2188 },
2189 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2190 swab_apm_power_in_minutes, "Sony VAIO",
2191 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2192 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2193 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2194 },
2195 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2196 swab_apm_power_in_minutes, "Sony VAIO",
2197 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2198 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2199 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2200 },
2201 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2202 swab_apm_power_in_minutes, "Sony VAIO",
2203 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2204 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2205 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2206 },
2207 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2208 swab_apm_power_in_minutes, "Sony VAIO",
2209 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2210 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2211 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2212 },
2213
2214 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2215 swab_apm_power_in_minutes, "Sony VAIO",
2216 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2217 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2218 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2219 },
2220 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2221 swab_apm_power_in_minutes, "Sony VAIO",
2222 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2223 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2224 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2225 },
2226 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2227 swab_apm_power_in_minutes, "Sony VAIO",
2228 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2229 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2230 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2231 },
2232 { /* broken PM poweroff bios */
2233 set_realmode_power_off, "Award Software v4.60 PGMA",
2234 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2235 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2236 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2237 },
2238
2239 /* Generic per vendor APM settings */
2240
2241 { /* Allow interrupts during suspend on IBM laptops */
2242 set_apm_ints, "IBM",
2243 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2244 },
2245
2246 { }
2247 };
2248
2249 /*
2250 * Just start the APM thread. We do NOT want to do APM BIOS
2251 * calls from anything but the APM thread, if for no other reason
2252 * than the fact that we don't trust the APM BIOS. This way,
2253 * most common APM BIOS problems that lead to protection errors
2254 * etc will have at least some level of being contained...
2255 *
2256 * In short, if something bad happens, at least we have a choice
2257 * of just killing the apm thread..
2258 */
2259 static int __init apm_init(void)
2260 {
2261 struct desc_struct *gdt;
2262 int err;
2263
2264 dmi_check_system(apm_dmi_table);
2265
2266 if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) {
2267 printk(KERN_INFO "apm: BIOS not found.\n");
2268 return -ENODEV;
2269 }
2270 printk(KERN_INFO
2271 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2272 ((apm_info.bios.version >> 8) & 0xff),
2273 (apm_info.bios.version & 0xff),
2274 apm_info.bios.flags,
2275 driver_version);
2276 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2277 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2278 return -ENODEV;
2279 }
2280
2281 if (allow_ints)
2282 apm_info.allow_ints = 1;
2283 if (broken_psr)
2284 apm_info.get_power_status_broken = 1;
2285 if (realmode_power_off)
2286 apm_info.realmode_power_off = 1;
2287 /* User can override, but default is to trust DMI */
2288 if (apm_disabled != -1)
2289 apm_info.disabled = apm_disabled;
2290
2291 /*
2292 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2293 * but is reportedly a 1.0 BIOS.
2294 */
2295 if (apm_info.bios.version == 0x001)
2296 apm_info.bios.version = 0x100;
2297
2298 /* BIOS < 1.2 doesn't set cseg_16_len */
2299 if (apm_info.bios.version < 0x102)
2300 apm_info.bios.cseg_16_len = 0; /* 64k */
2301
2302 if (debug) {
2303 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2304 apm_info.bios.cseg, apm_info.bios.offset,
2305 apm_info.bios.cseg_16, apm_info.bios.dseg);
2306 if (apm_info.bios.version > 0x100)
2307 printk(" cseg len %x, dseg len %x",
2308 apm_info.bios.cseg_len,
2309 apm_info.bios.dseg_len);
2310 if (apm_info.bios.version > 0x101)
2311 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2312 printk("\n");
2313 }
2314
2315 if (apm_info.disabled) {
2316 pr_notice("disabled on user request.\n");
2317 return -ENODEV;
2318 }
2319 if ((num_online_cpus() > 1) && !power_off && !smp) {
2320 pr_notice("disabled - APM is not SMP safe.\n");
2321 apm_info.disabled = 1;
2322 return -ENODEV;
2323 }
2324 if (!acpi_disabled) {
2325 pr_notice("overridden by ACPI.\n");
2326 apm_info.disabled = 1;
2327 return -ENODEV;
2328 }
2329
2330 /*
2331 * Set up the long jump entry point to the APM BIOS, which is called
2332 * from inline assembly.
2333 */
2334 apm_bios_entry.offset = apm_info.bios.offset;
2335 apm_bios_entry.segment = APM_CS;
2336
2337 /*
2338 * The APM 1.1 BIOS is supposed to provide limit information that it
2339 * recognizes. Many machines do this correctly, but many others do
2340 * not restrict themselves to their claimed limit. When this happens,
2341 * they will cause a segmentation violation in the kernel at boot time.
2342 * Most BIOS's, however, will respect a 64k limit, so we use that.
2343 *
2344 * Note we only set APM segments on CPU zero, since we pin the APM
2345 * code to that CPU.
2346 */
2347 gdt = get_cpu_gdt_table(0);
2348 set_desc_base(&gdt[APM_CS >> 3],
2349 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2350 set_desc_base(&gdt[APM_CS_16 >> 3],
2351 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2352 set_desc_base(&gdt[APM_DS >> 3],
2353 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2354
2355 proc_create("apm", 0, NULL, &apm_file_ops);
2356
2357 kapmd_task = kthread_create(apm, NULL, "kapmd");
2358 if (IS_ERR(kapmd_task)) {
2359 pr_err("disabled - Unable to start kernel thread\n");
2360 err = PTR_ERR(kapmd_task);
2361 kapmd_task = NULL;
2362 remove_proc_entry("apm", NULL);
2363 return err;
2364 }
2365 wake_up_process(kapmd_task);
2366
2367 if (num_online_cpus() > 1 && !smp) {
2368 printk(KERN_NOTICE
2369 "apm: disabled - APM is not SMP safe (power off active).\n");
2370 return 0;
2371 }
2372
2373 /*
2374 * Note we don't actually care if the misc_device cannot be registered.
2375 * this driver can do its job without it, even if userspace can't
2376 * control it. just log the error
2377 */
2378 if (misc_register(&apm_device))
2379 printk(KERN_WARNING "apm: Could not register misc device.\n");
2380
2381 if (HZ != 100)
2382 idle_period = (idle_period * HZ) / 100;
2383 if (idle_threshold < 100) {
2384 original_pm_idle = pm_idle;
2385 pm_idle = apm_cpu_idle;
2386 set_pm_idle = 1;
2387 }
2388
2389 return 0;
2390 }
2391
2392 static void __exit apm_exit(void)
2393 {
2394 int error;
2395
2396 if (set_pm_idle) {
2397 pm_idle = original_pm_idle;
2398 /*
2399 * We are about to unload the current idle thread pm callback
2400 * (pm_idle), Wait for all processors to update cached/local
2401 * copies of pm_idle before proceeding.
2402 */
2403 kick_all_cpus_sync();
2404 }
2405 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2406 && (apm_info.connection_version > 0x0100)) {
2407 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2408 if (error)
2409 apm_error("disengage power management", error);
2410 }
2411 misc_deregister(&apm_device);
2412 remove_proc_entry("apm", NULL);
2413 if (power_off)
2414 pm_power_off = NULL;
2415 if (kapmd_task) {
2416 kthread_stop(kapmd_task);
2417 kapmd_task = NULL;
2418 }
2419 }
2420
2421 module_init(apm_init);
2422 module_exit(apm_exit);
2423
2424 MODULE_AUTHOR("Stephen Rothwell");
2425 MODULE_DESCRIPTION("Advanced Power Management");
2426 MODULE_LICENSE("GPL");
2427 module_param(debug, bool, 0644);
2428 MODULE_PARM_DESC(debug, "Enable debug mode");
2429 module_param(power_off, bool, 0444);
2430 MODULE_PARM_DESC(power_off, "Enable power off");
2431 module_param(bounce_interval, int, 0444);
2432 MODULE_PARM_DESC(bounce_interval,
2433 "Set the number of ticks to ignore suspend bounces");
2434 module_param(allow_ints, bool, 0444);
2435 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2436 module_param(broken_psr, bool, 0444);
2437 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2438 module_param(realmode_power_off, bool, 0444);
2439 MODULE_PARM_DESC(realmode_power_off,
2440 "Switch to real mode before powering off");
2441 module_param(idle_threshold, int, 0444);
2442 MODULE_PARM_DESC(idle_threshold,
2443 "System idle percentage above which to make APM BIOS idle calls");
2444 module_param(idle_period, int, 0444);
2445 MODULE_PARM_DESC(idle_period,
2446 "Period (in sec/100) over which to caculate the idle percentage");
2447 module_param(smp, bool, 0444);
2448 MODULE_PARM_DESC(smp,
2449 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2450 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
CRIS linux kernel tree