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x86/speculation/mds: Fix documentation typo
[linux/fpc-iii.git] / arch / x86 / kernel / apm_32.c
blob63d3e6a6b5efc463f4e2b2003bdbf032df27d5d9
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/signal.h>
222 #include <linux/sched/cputime.h>
223 #include <linux/pm.h>
224 #include <linux/capability.h>
225 #include <linux/device.h>
226 #include <linux/kernel.h>
227 #include <linux/freezer.h>
228 #include <linux/smp.h>
229 #include <linux/dmi.h>
230 #include <linux/suspend.h>
231 #include <linux/kthread.h>
232 #include <linux/jiffies.h>
233 #include <linux/acpi.h>
234 #include <linux/syscore_ops.h>
235 #include <linux/i8253.h>
236 #include <linux/cpuidle.h>
237
238 #include <linux/uaccess.h>
239 #include <asm/desc.h>
240 #include <asm/olpc.h>
241 #include <asm/paravirt.h>
242 #include <asm/reboot.h>
243 #include <asm/nospec-branch.h>
244
245 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
246 extern int (*console_blank_hook)(int);
247 #endif
248
249 /*
250 * The apm_bios device is one of the misc char devices.
251 * This is its minor number.
252 */
253 #define APM_MINOR_DEV 134
254
255 /*
256 * Various options can be changed at boot time as follows:
257 * (We allow underscores for compatibility with the modules code)
258 * apm=on/off enable/disable APM
259 * [no-]allow[-_]ints allow interrupts during BIOS calls
260 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
261 * [no-]realmode[-_]power[-_]off switch to real mode before
262 * powering off
263 * [no-]debug log some debugging messages
264 * [no-]power[-_]off power off on shutdown
265 * [no-]smp Use apm even on an SMP box
266 * bounce[-_]interval=<n> number of ticks to ignore suspend
267 * bounces
268 * idle[-_]threshold=<n> System idle percentage above which to
269 * make APM BIOS idle calls. Set it to
270 * 100 to disable.
271 * idle[-_]period=<n> Period (in 1/100s of a second) over
272 * which the idle percentage is
273 * calculated.
274 */
275
276 /* KNOWN PROBLEM MACHINES:
277 *
278 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
279 * [Confirmed by TI representative]
280 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
281 * [Confirmed by BIOS disassembly]
282 * [This may work now ...]
283 * P: Toshiba 1950S: battery life information only gets updated after resume
284 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
285 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
286 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
287 * Neale Banks <neale@lowendale.com.au> December 2000
288 *
289 * Legend: U = unusable with APM patches
290 * P = partially usable with APM patches
291 */
292
293 /*
294 * Define as 1 to make the driver always call the APM BIOS busy
295 * routine even if the clock was not reported as slowed by the
296 * idle routine. Otherwise, define as 0.
297 */
298 #define ALWAYS_CALL_BUSY 1
299
300 /*
301 * Define to make the APM BIOS calls zero all data segment registers (so
302 * that an incorrect BIOS implementation will cause a kernel panic if it
303 * tries to write to arbitrary memory).
304 */
305 #define APM_ZERO_SEGS
306
307 #include <asm/apm.h>
308
309 /*
310 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
311 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
312 * David Chen <chen@ctpa04.mit.edu>
313 */
314 #undef INIT_TIMER_AFTER_SUSPEND
315
316 #ifdef INIT_TIMER_AFTER_SUSPEND
317 #include <linux/timex.h>
318 #include <asm/io.h>
319 #include <linux/delay.h>
320 #endif
321
322 /*
323 * Need to poll the APM BIOS every second
324 */
325 #define APM_CHECK_TIMEOUT (HZ)
326
327 /*
328 * Ignore suspend events for this amount of time after a resume
329 */
330 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
331
332 /*
333 * Maximum number of events stored
334 */
335 #define APM_MAX_EVENTS 20
336
337 /*
338 * The per-file APM data
339 */
340 struct apm_user {
341 int magic;
342 struct apm_user *next;
343 unsigned int suser: 1;
344 unsigned int writer: 1;
345 unsigned int reader: 1;
346 unsigned int suspend_wait: 1;
347 int suspend_result;
348 int suspends_pending;
349 int standbys_pending;
350 int suspends_read;
351 int standbys_read;
352 int event_head;
353 int event_tail;
354 apm_event_t events[APM_MAX_EVENTS];
355 };
356
357 /*
358 * The magic number in apm_user
359 */
360 #define APM_BIOS_MAGIC 0x4101
361
362 /*
363 * idle percentage above which bios idle calls are done
364 */
365 #ifdef CONFIG_APM_CPU_IDLE
366 #define DEFAULT_IDLE_THRESHOLD 95
367 #else
368 #define DEFAULT_IDLE_THRESHOLD 100
369 #endif
370 #define DEFAULT_IDLE_PERIOD (100 / 3)
371
372 static int apm_cpu_idle(struct cpuidle_device *dev,
373 struct cpuidle_driver *drv, int index);
374
375 static struct cpuidle_driver apm_idle_driver = {
376 .name = "apm_idle",
377 .owner = THIS_MODULE,
378 .states = {
379 { /* entry 0 is for polling */ },
380 { /* entry 1 is for APM idle */
381 .name = "APM",
382 .desc = "APM idle",
383 .exit_latency = 250, /* WAG */
384 .target_residency = 500, /* WAG */
385 .enter = &apm_cpu_idle
386 },
387 },
388 .state_count = 2,
389 };
390
391 static struct cpuidle_device apm_cpuidle_device;
392
393 /*
394 * Local variables
395 */
396 __visible struct {
397 unsigned long offset;
398 unsigned short segment;
399 } apm_bios_entry;
400 static int clock_slowed;
401 static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
402 static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
403 static int suspends_pending;
404 static int standbys_pending;
405 static int ignore_sys_suspend;
406 static int ignore_normal_resume;
407 static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
408
409 static bool debug __read_mostly;
410 static bool smp __read_mostly;
411 static int apm_disabled = -1;
412 #ifdef CONFIG_SMP
413 static bool power_off;
414 #else
415 static bool power_off = 1;
416 #endif
417 static bool realmode_power_off;
418 #ifdef CONFIG_APM_ALLOW_INTS
419 static bool allow_ints = 1;
420 #else
421 static bool allow_ints;
422 #endif
423 static bool broken_psr;
424
425 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
426 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
427 static struct apm_user *user_list;
428 static DEFINE_SPINLOCK(user_list_lock);
429 static DEFINE_MUTEX(apm_mutex);
430
431 /*
432 * Set up a segment that references the real mode segment 0x40
433 * that extends up to the end of page zero (that we have reserved).
434 * This is for buggy BIOS's that refer to (real mode) segment 0x40
435 * even though they are called in protected mode.
436 */
437 static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
438 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
439
440 static const char driver_version[] = "1.16ac"; /* no spaces */
441
442 static struct task_struct *kapmd_task;
443
444 /*
445 * APM event names taken from the APM 1.2 specification. These are
446 * the message codes that the BIOS uses to tell us about events
447 */
448 static const char * const apm_event_name[] = {
449 "system standby",
450 "system suspend",
451 "normal resume",
452 "critical resume",
453 "low battery",
454 "power status change",
455 "update time",
456 "critical suspend",
457 "user standby",
458 "user suspend",
459 "system standby resume",
460 "capabilities change"
461 };
462 #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
463
464 typedef struct lookup_t {
465 int key;
466 char *msg;
467 } lookup_t;
468
469 /*
470 * The BIOS returns a set of standard error codes in AX when the
471 * carry flag is set.
472 */
473
474 static const lookup_t error_table[] = {
475 /* N/A { APM_SUCCESS, "Operation succeeded" }, */
476 { APM_DISABLED, "Power management disabled" },
477 { APM_CONNECTED, "Real mode interface already connected" },
478 { APM_NOT_CONNECTED, "Interface not connected" },
479 { APM_16_CONNECTED, "16 bit interface already connected" },
480 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
481 { APM_32_CONNECTED, "32 bit interface already connected" },
482 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
483 { APM_BAD_DEVICE, "Unrecognized device ID" },
484 { APM_BAD_PARAM, "Parameter out of range" },
485 { APM_NOT_ENGAGED, "Interface not engaged" },
486 { APM_BAD_FUNCTION, "Function not supported" },
487 { APM_RESUME_DISABLED, "Resume timer disabled" },
488 { APM_BAD_STATE, "Unable to enter requested state" },
489 /* N/A { APM_NO_EVENTS, "No events pending" }, */
490 { APM_NO_ERROR, "BIOS did not set a return code" },
491 { APM_NOT_PRESENT, "No APM present" }
492 };
493 #define ERROR_COUNT ARRAY_SIZE(error_table)
494
495 /**
496 * apm_error - display an APM error
497 * @str: information string
498 * @err: APM BIOS return code
499 *
500 * Write a meaningful log entry to the kernel log in the event of
501 * an APM error. Note that this also handles (negative) kernel errors.
502 */
503
504 static void apm_error(char *str, int err)
505 {
506 int i;
507
508 for (i = 0; i < ERROR_COUNT; i++)
509 if (error_table[i].key == err)
510 break;
511 if (i < ERROR_COUNT)
512 pr_notice("%s: %s\n", str, error_table[i].msg);
513 else if (err < 0)
514 pr_notice("%s: linux error code %i\n", str, err);
515 else
516 pr_notice("%s: unknown error code %#2.2x\n",
517 str, err);
518 }
519
520 /*
521 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
522 * apm_info.allow_ints, we are being really paranoid here! Not only
523 * are interrupts disabled, but all the segment registers (except SS)
524 * are saved and zeroed this means that if the BIOS tries to reference
525 * any data without explicitly loading the segment registers, the kernel
526 * will fault immediately rather than have some unforeseen circumstances
527 * for the rest of the kernel. And it will be very obvious! :-) Doing
528 * this depends on CS referring to the same physical memory as DS so that
529 * DS can be zeroed before the call. Unfortunately, we can't do anything
530 * about the stack segment/pointer. Also, we tell the compiler that
531 * everything could change.
532 *
533 * Also, we KNOW that for the non error case of apm_bios_call, there
534 * is no useful data returned in the low order 8 bits of eax.
535 */
536
537 static inline unsigned long __apm_irq_save(void)
538 {
539 unsigned long flags;
540 local_save_flags(flags);
541 if (apm_info.allow_ints) {
542 if (irqs_disabled_flags(flags))
543 local_irq_enable();
544 } else
545 local_irq_disable();
546
547 return flags;
548 }
549
550 #define apm_irq_save(flags) \
551 do { flags = __apm_irq_save(); } while (0)
552
553 static inline void apm_irq_restore(unsigned long flags)
554 {
555 if (irqs_disabled_flags(flags))
556 local_irq_disable();
557 else if (irqs_disabled())
558 local_irq_enable();
559 }
560
561 #ifdef APM_ZERO_SEGS
562 # define APM_DECL_SEGS \
563 unsigned int saved_fs; unsigned int saved_gs;
564 # define APM_DO_SAVE_SEGS \
565 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
566 # define APM_DO_RESTORE_SEGS \
567 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
568 #else
569 # define APM_DECL_SEGS
570 # define APM_DO_SAVE_SEGS
571 # define APM_DO_RESTORE_SEGS
572 #endif
573
574 struct apm_bios_call {
575 u32 func;
576 /* In and out */
577 u32 ebx;
578 u32 ecx;
579 /* Out only */
580 u32 eax;
581 u32 edx;
582 u32 esi;
583
584 /* Error: -ENOMEM, or bits 8-15 of eax */
585 int err;
586 };
587
588 /**
589 * __apm_bios_call - Make an APM BIOS 32bit call
590 * @_call: pointer to struct apm_bios_call.
591 *
592 * Make an APM call using the 32bit protected mode interface. The
593 * caller is responsible for knowing if APM BIOS is configured and
594 * enabled. This call can disable interrupts for a long period of
595 * time on some laptops. The return value is in AH and the carry
596 * flag is loaded into AL. If there is an error, then the error
597 * code is returned in AH (bits 8-15 of eax) and this function
598 * returns non-zero.
599 *
600 * Note: this makes the call on the current CPU.
601 */
602 static long __apm_bios_call(void *_call)
603 {
604 APM_DECL_SEGS
605 unsigned long flags;
606 int cpu;
607 struct desc_struct save_desc_40;
608 struct desc_struct *gdt;
609 struct apm_bios_call *call = _call;
610
611 cpu = get_cpu();
612 BUG_ON(cpu != 0);
613 gdt = get_cpu_gdt_rw(cpu);
614 save_desc_40 = gdt[0x40 / 8];
615 gdt[0x40 / 8] = bad_bios_desc;
616
617 apm_irq_save(flags);
618 firmware_restrict_branch_speculation_start();
619 APM_DO_SAVE_SEGS;
620 apm_bios_call_asm(call->func, call->ebx, call->ecx,
621 &call->eax, &call->ebx, &call->ecx, &call->edx,
622 &call->esi);
623 APM_DO_RESTORE_SEGS;
624 firmware_restrict_branch_speculation_end();
625 apm_irq_restore(flags);
626 gdt[0x40 / 8] = save_desc_40;
627 put_cpu();
628
629 return call->eax & 0xff;
630 }
631
632 /* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
633 static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
634 {
635 int ret;
636
637 /* Don't bother with work_on_cpu in the common case, so we don't
638 * have to worry about OOM or overhead. */
639 if (get_cpu() == 0) {
640 ret = fn(call);
641 put_cpu();
642 } else {
643 put_cpu();
644 ret = work_on_cpu(0, fn, call);
645 }
646
647 /* work_on_cpu can fail with -ENOMEM */
648 if (ret < 0)
649 call->err = ret;
650 else
651 call->err = (call->eax >> 8) & 0xff;
652
653 return ret;
654 }
655
656 /**
657 * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0)
658 * @call: the apm_bios_call registers.
659 *
660 * If there is an error, it is returned in @call.err.
661 */
662 static int apm_bios_call(struct apm_bios_call *call)
663 {
664 return on_cpu0(__apm_bios_call, call);
665 }
666
667 /**
668 * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
669 * @_call: pointer to struct apm_bios_call.
670 *
671 * Make a BIOS call that returns one value only, or just status.
672 * If there is an error, then the error code is returned in AH
673 * (bits 8-15 of eax) and this function returns non-zero (it can
674 * also return -ENOMEM). This is used for simpler BIOS operations.
675 * This call may hold interrupts off for a long time on some laptops.
676 *
677 * Note: this makes the call on the current CPU.
678 */
679 static long __apm_bios_call_simple(void *_call)
680 {
681 u8 error;
682 APM_DECL_SEGS
683 unsigned long flags;
684 int cpu;
685 struct desc_struct save_desc_40;
686 struct desc_struct *gdt;
687 struct apm_bios_call *call = _call;
688
689 cpu = get_cpu();
690 BUG_ON(cpu != 0);
691 gdt = get_cpu_gdt_rw(cpu);
692 save_desc_40 = gdt[0x40 / 8];
693 gdt[0x40 / 8] = bad_bios_desc;
694
695 apm_irq_save(flags);
696 firmware_restrict_branch_speculation_start();
697 APM_DO_SAVE_SEGS;
698 error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
699 &call->eax);
700 APM_DO_RESTORE_SEGS;
701 firmware_restrict_branch_speculation_end();
702 apm_irq_restore(flags);
703 gdt[0x40 / 8] = save_desc_40;
704 put_cpu();
705 return error;
706 }
707
708 /**
709 * apm_bios_call_simple - make a simple APM BIOS 32bit call
710 * @func: APM function to invoke
711 * @ebx_in: EBX register value for BIOS call
712 * @ecx_in: ECX register value for BIOS call
713 * @eax: EAX register on return from the BIOS call
714 * @err: bits
715 *
716 * Make a BIOS call that returns one value only, or just status.
717 * If there is an error, then the error code is returned in @err
718 * and this function returns non-zero. This is used for simpler
719 * BIOS operations. This call may hold interrupts off for a long
720 * time on some laptops.
721 */
722 static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
723 int *err)
724 {
725 struct apm_bios_call call;
726 int ret;
727
728 call.func = func;
729 call.ebx = ebx_in;
730 call.ecx = ecx_in;
731
732 ret = on_cpu0(__apm_bios_call_simple, &call);
733 *eax = call.eax;
734 *err = call.err;
735 return ret;
736 }
737
738 /**
739 * apm_driver_version - APM driver version
740 * @val: loaded with the APM version on return
741 *
742 * Retrieve the APM version supported by the BIOS. This is only
743 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
744 * probably present.
745 *
746 * On entry val should point to a value indicating the APM driver
747 * version with the high byte being the major and the low byte the
748 * minor number both in BCD
749 *
750 * On return it will hold the BIOS revision supported in the
751 * same format.
752 */
753
754 static int apm_driver_version(u_short *val)
755 {
756 u32 eax;
757 int err;
758
759 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
760 return err;
761 *val = eax;
762 return APM_SUCCESS;
763 }
764
765 /**
766 * apm_get_event - get an APM event from the BIOS
767 * @event: pointer to the event
768 * @info: point to the event information
769 *
770 * The APM BIOS provides a polled information for event
771 * reporting. The BIOS expects to be polled at least every second
772 * when events are pending. When a message is found the caller should
773 * poll until no more messages are present. However, this causes
774 * problems on some laptops where a suspend event notification is
775 * not cleared until it is acknowledged.
776 *
777 * Additional information is returned in the info pointer, providing
778 * that APM 1.2 is in use. If no messges are pending the value 0x80
779 * is returned (No power management events pending).
780 */
781 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
782 {
783 struct apm_bios_call call;
784
785 call.func = APM_FUNC_GET_EVENT;
786 call.ebx = call.ecx = 0;
787
788 if (apm_bios_call(&call))
789 return call.err;
790
791 *event = call.ebx;
792 if (apm_info.connection_version < 0x0102)
793 *info = ~0; /* indicate info not valid */
794 else
795 *info = call.ecx;
796 return APM_SUCCESS;
797 }
798
799 /**
800 * set_power_state - set the power management state
801 * @what: which items to transition
802 * @state: state to transition to
803 *
804 * Request an APM change of state for one or more system devices. The
805 * processor state must be transitioned last of all. what holds the
806 * class of device in the upper byte and the device number (0xFF for
807 * all) for the object to be transitioned.
808 *
809 * The state holds the state to transition to, which may in fact
810 * be an acceptance of a BIOS requested state change.
811 */
812
813 static int set_power_state(u_short what, u_short state)
814 {
815 u32 eax;
816 int err;
817
818 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
819 return err;
820 return APM_SUCCESS;
821 }
822
823 /**
824 * set_system_power_state - set system wide power state
825 * @state: which state to enter
826 *
827 * Transition the entire system into a new APM power state.
828 */
829
830 static int set_system_power_state(u_short state)
831 {
832 return set_power_state(APM_DEVICE_ALL, state);
833 }
834
835 /**
836 * apm_do_idle - perform power saving
837 *
838 * This function notifies the BIOS that the processor is (in the view
839 * of the OS) idle. It returns -1 in the event that the BIOS refuses
840 * to handle the idle request. On a success the function returns 1
841 * if the BIOS did clock slowing or 0 otherwise.
842 */
843
844 static int apm_do_idle(void)
845 {
846 u32 eax;
847 u8 ret = 0;
848 int idled = 0;
849 int err = 0;
850
851 if (!need_resched()) {
852 idled = 1;
853 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
854 }
855
856 if (!idled)
857 return 0;
858
859 if (ret) {
860 static unsigned long t;
861
862 /* This always fails on some SMP boards running UP kernels.
863 * Only report the failure the first 5 times.
864 */
865 if (++t < 5) {
866 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
867 t = jiffies;
868 }
869 return -1;
870 }
871 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
872 return clock_slowed;
873 }
874
875 /**
876 * apm_do_busy - inform the BIOS the CPU is busy
877 *
878 * Request that the BIOS brings the CPU back to full performance.
879 */
880
881 static void apm_do_busy(void)
882 {
883 u32 dummy;
884 int err;
885
886 if (clock_slowed || ALWAYS_CALL_BUSY) {
887 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
888 clock_slowed = 0;
889 }
890 }
891
892 /*
893 * If no process has really been interested in
894 * the CPU for some time, we want to call BIOS
895 * power management - we probably want
896 * to conserve power.
897 */
898 #define IDLE_CALC_LIMIT (HZ * 100)
899 #define IDLE_LEAKY_MAX 16
900
901 /**
902 * apm_cpu_idle - cpu idling for APM capable Linux
903 *
904 * This is the idling function the kernel executes when APM is available. It
905 * tries to do BIOS powermanagement based on the average system idle time.
906 * Furthermore it calls the system default idle routine.
907 */
908
909 static int apm_cpu_idle(struct cpuidle_device *dev,
910 struct cpuidle_driver *drv, int index)
911 {
912 static int use_apm_idle; /* = 0 */
913 static unsigned int last_jiffies; /* = 0 */
914 static u64 last_stime; /* = 0 */
915 u64 stime, utime;
916
917 int apm_idle_done = 0;
918 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
919 unsigned int bucket;
920
921 recalc:
922 task_cputime(current, &utime, &stime);
923 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
924 use_apm_idle = 0;
925 } else if (jiffies_since_last_check > idle_period) {
926 unsigned int idle_percentage;
927
928 idle_percentage = nsecs_to_jiffies(stime - last_stime);
929 idle_percentage *= 100;
930 idle_percentage /= jiffies_since_last_check;
931 use_apm_idle = (idle_percentage > idle_threshold);
932 if (apm_info.forbid_idle)
933 use_apm_idle = 0;
934 }
935
936 last_jiffies = jiffies;
937 last_stime = stime;
938
939 bucket = IDLE_LEAKY_MAX;
940
941 while (!need_resched()) {
942 if (use_apm_idle) {
943 unsigned int t;
944
945 t = jiffies;
946 switch (apm_do_idle()) {
947 case 0:
948 apm_idle_done = 1;
949 if (t != jiffies) {
950 if (bucket) {
951 bucket = IDLE_LEAKY_MAX;
952 continue;
953 }
954 } else if (bucket) {
955 bucket--;
956 continue;
957 }
958 break;
959 case 1:
960 apm_idle_done = 1;
961 break;
962 default: /* BIOS refused */
963 break;
964 }
965 }
966 default_idle();
967 local_irq_disable();
968 jiffies_since_last_check = jiffies - last_jiffies;
969 if (jiffies_since_last_check > idle_period)
970 goto recalc;
971 }
972
973 if (apm_idle_done)
974 apm_do_busy();
975
976 return index;
977 }
978
979 /**
980 * apm_power_off - ask the BIOS to power off
981 *
982 * Handle the power off sequence. This is the one piece of code we
983 * will execute even on SMP machines. In order to deal with BIOS
984 * bugs we support real mode APM BIOS power off calls. We also make
985 * the SMP call on CPU0 as some systems will only honour this call
986 * on their first cpu.
987 */
988
989 static void apm_power_off(void)
990 {
991 /* Some bioses don't like being called from CPU != 0 */
992 if (apm_info.realmode_power_off) {
993 set_cpus_allowed_ptr(current, cpumask_of(0));
994 machine_real_restart(MRR_APM);
995 } else {
996 (void)set_system_power_state(APM_STATE_OFF);
997 }
998 }
999
1000 #ifdef CONFIG_APM_DO_ENABLE
1001
1002 /**
1003 * apm_enable_power_management - enable BIOS APM power management
1004 * @enable: enable yes/no
1005 *
1006 * Enable or disable the APM BIOS power services.
1007 */
1008
1009 static int apm_enable_power_management(int enable)
1010 {
1011 u32 eax;
1012 int err;
1013
1014 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1015 return APM_NOT_ENGAGED;
1016 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1017 enable, &eax, &err))
1018 return err;
1019 if (enable)
1020 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1021 else
1022 apm_info.bios.flags |= APM_BIOS_DISABLED;
1023 return APM_SUCCESS;
1024 }
1025 #endif
1026
1027 /**
1028 * apm_get_power_status - get current power state
1029 * @status: returned status
1030 * @bat: battery info
1031 * @life: estimated life
1032 *
1033 * Obtain the current power status from the APM BIOS. We return a
1034 * status which gives the rough battery status, and current power
1035 * source. The bat value returned give an estimate as a percentage
1036 * of life and a status value for the battery. The estimated life
1037 * if reported is a lifetime in secodnds/minutes at current powwer
1038 * consumption.
1039 */
1040
1041 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1042 {
1043 struct apm_bios_call call;
1044
1045 call.func = APM_FUNC_GET_STATUS;
1046 call.ebx = APM_DEVICE_ALL;
1047 call.ecx = 0;
1048
1049 if (apm_info.get_power_status_broken)
1050 return APM_32_UNSUPPORTED;
1051 if (apm_bios_call(&call)) {
1052 if (!call.err)
1053 return APM_NO_ERROR;
1054 return call.err;
1055 }
1056 *status = call.ebx;
1057 *bat = call.ecx;
1058 if (apm_info.get_power_status_swabinminutes) {
1059 *life = swab16((u16)call.edx);
1060 *life |= 0x8000;
1061 } else
1062 *life = call.edx;
1063 return APM_SUCCESS;
1064 }
1065
1066 #if 0
1067 static int apm_get_battery_status(u_short which, u_short *status,
1068 u_short *bat, u_short *life, u_short *nbat)
1069 {
1070 u32 eax;
1071 u32 ebx;
1072 u32 ecx;
1073 u32 edx;
1074 u32 esi;
1075
1076 if (apm_info.connection_version < 0x0102) {
1077 /* pretend we only have one battery. */
1078 if (which != 1)
1079 return APM_BAD_DEVICE;
1080 *nbat = 1;
1081 return apm_get_power_status(status, bat, life);
1082 }
1083
1084 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1085 &ebx, &ecx, &edx, &esi))
1086 return (eax >> 8) & 0xff;
1087 *status = ebx;
1088 *bat = ecx;
1089 *life = edx;
1090 *nbat = esi;
1091 return APM_SUCCESS;
1092 }
1093 #endif
1094
1095 /**
1096 * apm_engage_power_management - enable PM on a device
1097 * @device: identity of device
1098 * @enable: on/off
1099 *
1100 * Activate or deactivate power management on either a specific device
1101 * or the entire system (%APM_DEVICE_ALL).
1102 */
1103
1104 static int apm_engage_power_management(u_short device, int enable)
1105 {
1106 u32 eax;
1107 int err;
1108
1109 if ((enable == 0) && (device == APM_DEVICE_ALL)
1110 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1111 return APM_DISABLED;
1112 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1113 &eax, &err))
1114 return err;
1115 if (device == APM_DEVICE_ALL) {
1116 if (enable)
1117 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1118 else
1119 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1120 }
1121 return APM_SUCCESS;
1122 }
1123
1124 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1125
1126 /**
1127 * apm_console_blank - blank the display
1128 * @blank: on/off
1129 *
1130 * Attempt to blank the console, firstly by blanking just video device
1131 * zero, and if that fails (some BIOSes don't support it) then it blanks
1132 * all video devices. Typically the BIOS will do laptop backlight and
1133 * monitor powerdown for us.
1134 */
1135
1136 static int apm_console_blank(int blank)
1137 {
1138 int error = APM_NOT_ENGAGED; /* silence gcc */
1139 int i;
1140 u_short state;
1141 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1142
1143 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1144
1145 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1146 error = set_power_state(dev[i], state);
1147
1148 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1149 return 1;
1150
1151 if (error == APM_NOT_ENGAGED)
1152 break;
1153 }
1154
1155 if (error == APM_NOT_ENGAGED) {
1156 static int tried;
1157 int eng_error;
1158 if (tried++ == 0) {
1159 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1160 if (eng_error) {
1161 apm_error("set display", error);
1162 apm_error("engage interface", eng_error);
1163 return 0;
1164 } else
1165 return apm_console_blank(blank);
1166 }
1167 }
1168 apm_error("set display", error);
1169 return 0;
1170 }
1171 #endif
1172
1173 static int queue_empty(struct apm_user *as)
1174 {
1175 return as->event_head == as->event_tail;
1176 }
1177
1178 static apm_event_t get_queued_event(struct apm_user *as)
1179 {
1180 if (++as->event_tail >= APM_MAX_EVENTS)
1181 as->event_tail = 0;
1182 return as->events[as->event_tail];
1183 }
1184
1185 static void queue_event(apm_event_t event, struct apm_user *sender)
1186 {
1187 struct apm_user *as;
1188
1189 spin_lock(&user_list_lock);
1190 if (user_list == NULL)
1191 goto out;
1192 for (as = user_list; as != NULL; as = as->next) {
1193 if ((as == sender) || (!as->reader))
1194 continue;
1195 if (++as->event_head >= APM_MAX_EVENTS)
1196 as->event_head = 0;
1197
1198 if (as->event_head == as->event_tail) {
1199 static int notified;
1200
1201 if (notified++ == 0)
1202 pr_err("an event queue overflowed\n");
1203 if (++as->event_tail >= APM_MAX_EVENTS)
1204 as->event_tail = 0;
1205 }
1206 as->events[as->event_head] = event;
1207 if (!as->suser || !as->writer)
1208 continue;
1209 switch (event) {
1210 case APM_SYS_SUSPEND:
1211 case APM_USER_SUSPEND:
1212 as->suspends_pending++;
1213 suspends_pending++;
1214 break;
1215
1216 case APM_SYS_STANDBY:
1217 case APM_USER_STANDBY:
1218 as->standbys_pending++;
1219 standbys_pending++;
1220 break;
1221 }
1222 }
1223 wake_up_interruptible(&apm_waitqueue);
1224 out:
1225 spin_unlock(&user_list_lock);
1226 }
1227
1228 static void reinit_timer(void)
1229 {
1230 #ifdef INIT_TIMER_AFTER_SUSPEND
1231 unsigned long flags;
1232
1233 raw_spin_lock_irqsave(&i8253_lock, flags);
1234 /* set the clock to HZ */
1235 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1236 udelay(10);
1237 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1238 udelay(10);
1239 outb_p(LATCH >> 8, PIT_CH0); /* MSB */
1240 udelay(10);
1241 raw_spin_unlock_irqrestore(&i8253_lock, flags);
1242 #endif
1243 }
1244
1245 static int suspend(int vetoable)
1246 {
1247 int err;
1248 struct apm_user *as;
1249
1250 dpm_suspend_start(PMSG_SUSPEND);
1251 dpm_suspend_end(PMSG_SUSPEND);
1252
1253 local_irq_disable();
1254 syscore_suspend();
1255
1256 local_irq_enable();
1257
1258 save_processor_state();
1259 err = set_system_power_state(APM_STATE_SUSPEND);
1260 ignore_normal_resume = 1;
1261 restore_processor_state();
1262
1263 local_irq_disable();
1264 reinit_timer();
1265
1266 if (err == APM_NO_ERROR)
1267 err = APM_SUCCESS;
1268 if (err != APM_SUCCESS)
1269 apm_error("suspend", err);
1270 err = (err == APM_SUCCESS) ? 0 : -EIO;
1271
1272 syscore_resume();
1273 local_irq_enable();
1274
1275 dpm_resume_start(PMSG_RESUME);
1276 dpm_resume_end(PMSG_RESUME);
1277
1278 queue_event(APM_NORMAL_RESUME, NULL);
1279 spin_lock(&user_list_lock);
1280 for (as = user_list; as != NULL; as = as->next) {
1281 as->suspend_wait = 0;
1282 as->suspend_result = err;
1283 }
1284 spin_unlock(&user_list_lock);
1285 wake_up_interruptible(&apm_suspend_waitqueue);
1286 return err;
1287 }
1288
1289 static void standby(void)
1290 {
1291 int err;
1292
1293 dpm_suspend_end(PMSG_SUSPEND);
1294
1295 local_irq_disable();
1296 syscore_suspend();
1297 local_irq_enable();
1298
1299 err = set_system_power_state(APM_STATE_STANDBY);
1300 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1301 apm_error("standby", err);
1302
1303 local_irq_disable();
1304 syscore_resume();
1305 local_irq_enable();
1306
1307 dpm_resume_start(PMSG_RESUME);
1308 }
1309
1310 static apm_event_t get_event(void)
1311 {
1312 int error;
1313 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1314 apm_eventinfo_t info;
1315
1316 static int notified;
1317
1318 /* we don't use the eventinfo */
1319 error = apm_get_event(&event, &info);
1320 if (error == APM_SUCCESS)
1321 return event;
1322
1323 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1324 apm_error("get_event", error);
1325
1326 return 0;
1327 }
1328
1329 static void check_events(void)
1330 {
1331 apm_event_t event;
1332 static unsigned long last_resume;
1333 static int ignore_bounce;
1334
1335 while ((event = get_event()) != 0) {
1336 if (debug) {
1337 if (event <= NR_APM_EVENT_NAME)
1338 printk(KERN_DEBUG "apm: received %s notify\n",
1339 apm_event_name[event - 1]);
1340 else
1341 printk(KERN_DEBUG "apm: received unknown "
1342 "event 0x%02x\n", event);
1343 }
1344 if (ignore_bounce
1345 && (time_after(jiffies, last_resume + bounce_interval)))
1346 ignore_bounce = 0;
1347
1348 switch (event) {
1349 case APM_SYS_STANDBY:
1350 case APM_USER_STANDBY:
1351 queue_event(event, NULL);
1352 if (standbys_pending <= 0)
1353 standby();
1354 break;
1355
1356 case APM_USER_SUSPEND:
1357 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1358 if (apm_info.connection_version > 0x100)
1359 set_system_power_state(APM_STATE_REJECT);
1360 break;
1361 #endif
1362 case APM_SYS_SUSPEND:
1363 if (ignore_bounce) {
1364 if (apm_info.connection_version > 0x100)
1365 set_system_power_state(APM_STATE_REJECT);
1366 break;
1367 }
1368 /*
1369 * If we are already processing a SUSPEND,
1370 * then further SUSPEND events from the BIOS
1371 * will be ignored. We also return here to
1372 * cope with the fact that the Thinkpads keep
1373 * sending a SUSPEND event until something else
1374 * happens!
1375 */
1376 if (ignore_sys_suspend)
1377 return;
1378 ignore_sys_suspend = 1;
1379 queue_event(event, NULL);
1380 if (suspends_pending <= 0)
1381 (void) suspend(1);
1382 break;
1383
1384 case APM_NORMAL_RESUME:
1385 case APM_CRITICAL_RESUME:
1386 case APM_STANDBY_RESUME:
1387 ignore_sys_suspend = 0;
1388 last_resume = jiffies;
1389 ignore_bounce = 1;
1390 if ((event != APM_NORMAL_RESUME)
1391 || (ignore_normal_resume == 0)) {
1392 dpm_resume_end(PMSG_RESUME);
1393 queue_event(event, NULL);
1394 }
1395 ignore_normal_resume = 0;
1396 break;
1397
1398 case APM_CAPABILITY_CHANGE:
1399 case APM_LOW_BATTERY:
1400 case APM_POWER_STATUS_CHANGE:
1401 queue_event(event, NULL);
1402 /* If needed, notify drivers here */
1403 break;
1404
1405 case APM_UPDATE_TIME:
1406 break;
1407
1408 case APM_CRITICAL_SUSPEND:
1409 /*
1410 * We are not allowed to reject a critical suspend.
1411 */
1412 (void)suspend(0);
1413 break;
1414 }
1415 }
1416 }
1417
1418 static void apm_event_handler(void)
1419 {
1420 static int pending_count = 4;
1421 int err;
1422
1423 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1424 if ((apm_info.connection_version > 0x100) &&
1425 (pending_count-- <= 0)) {
1426 pending_count = 4;
1427 if (debug)
1428 printk(KERN_DEBUG "apm: setting state busy\n");
1429 err = set_system_power_state(APM_STATE_BUSY);
1430 if (err)
1431 apm_error("busy", err);
1432 }
1433 } else
1434 pending_count = 4;
1435 check_events();
1436 }
1437
1438 /*
1439 * This is the APM thread main loop.
1440 */
1441
1442 static void apm_mainloop(void)
1443 {
1444 DECLARE_WAITQUEUE(wait, current);
1445
1446 add_wait_queue(&apm_waitqueue, &wait);
1447 set_current_state(TASK_INTERRUPTIBLE);
1448 for (;;) {
1449 schedule_timeout(APM_CHECK_TIMEOUT);
1450 if (kthread_should_stop())
1451 break;
1452 /*
1453 * Ok, check all events, check for idle (and mark us sleeping
1454 * so as not to count towards the load average)..
1455 */
1456 set_current_state(TASK_INTERRUPTIBLE);
1457 apm_event_handler();
1458 }
1459 remove_wait_queue(&apm_waitqueue, &wait);
1460 }
1461
1462 static int check_apm_user(struct apm_user *as, const char *func)
1463 {
1464 if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1465 pr_err("%s passed bad filp\n", func);
1466 return 1;
1467 }
1468 return 0;
1469 }
1470
1471 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1472 {
1473 struct apm_user *as;
1474 int i;
1475 apm_event_t event;
1476
1477 as = fp->private_data;
1478 if (check_apm_user(as, "read"))
1479 return -EIO;
1480 if ((int)count < sizeof(apm_event_t))
1481 return -EINVAL;
1482 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1483 return -EAGAIN;
1484 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1485 i = count;
1486 while ((i >= sizeof(event)) && !queue_empty(as)) {
1487 event = get_queued_event(as);
1488 if (copy_to_user(buf, &event, sizeof(event))) {
1489 if (i < count)
1490 break;
1491 return -EFAULT;
1492 }
1493 switch (event) {
1494 case APM_SYS_SUSPEND:
1495 case APM_USER_SUSPEND:
1496 as->suspends_read++;
1497 break;
1498
1499 case APM_SYS_STANDBY:
1500 case APM_USER_STANDBY:
1501 as->standbys_read++;
1502 break;
1503 }
1504 buf += sizeof(event);
1505 i -= sizeof(event);
1506 }
1507 if (i < count)
1508 return count - i;
1509 if (signal_pending(current))
1510 return -ERESTARTSYS;
1511 return 0;
1512 }
1513
1514 static unsigned int do_poll(struct file *fp, poll_table *wait)
1515 {
1516 struct apm_user *as;
1517
1518 as = fp->private_data;
1519 if (check_apm_user(as, "poll"))
1520 return 0;
1521 poll_wait(fp, &apm_waitqueue, wait);
1522 if (!queue_empty(as))
1523 return POLLIN | POLLRDNORM;
1524 return 0;
1525 }
1526
1527 static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1528 {
1529 struct apm_user *as;
1530 int ret;
1531
1532 as = filp->private_data;
1533 if (check_apm_user(as, "ioctl"))
1534 return -EIO;
1535 if (!as->suser || !as->writer)
1536 return -EPERM;
1537 switch (cmd) {
1538 case APM_IOC_STANDBY:
1539 mutex_lock(&apm_mutex);
1540 if (as->standbys_read > 0) {
1541 as->standbys_read--;
1542 as->standbys_pending--;
1543 standbys_pending--;
1544 } else
1545 queue_event(APM_USER_STANDBY, as);
1546 if (standbys_pending <= 0)
1547 standby();
1548 mutex_unlock(&apm_mutex);
1549 break;
1550 case APM_IOC_SUSPEND:
1551 mutex_lock(&apm_mutex);
1552 if (as->suspends_read > 0) {
1553 as->suspends_read--;
1554 as->suspends_pending--;
1555 suspends_pending--;
1556 } else
1557 queue_event(APM_USER_SUSPEND, as);
1558 if (suspends_pending <= 0) {
1559 ret = suspend(1);
1560 mutex_unlock(&apm_mutex);
1561 } else {
1562 as->suspend_wait = 1;
1563 mutex_unlock(&apm_mutex);
1564 wait_event_interruptible(apm_suspend_waitqueue,
1565 as->suspend_wait == 0);
1566 ret = as->suspend_result;
1567 }
1568 return ret;
1569 default:
1570 return -ENOTTY;
1571 }
1572 return 0;
1573 }
1574
1575 static int do_release(struct inode *inode, struct file *filp)
1576 {
1577 struct apm_user *as;
1578
1579 as = filp->private_data;
1580 if (check_apm_user(as, "release"))
1581 return 0;
1582 filp->private_data = NULL;
1583 if (as->standbys_pending > 0) {
1584 standbys_pending -= as->standbys_pending;
1585 if (standbys_pending <= 0)
1586 standby();
1587 }
1588 if (as->suspends_pending > 0) {
1589 suspends_pending -= as->suspends_pending;
1590 if (suspends_pending <= 0)
1591 (void) suspend(1);
1592 }
1593 spin_lock(&user_list_lock);
1594 if (user_list == as)
1595 user_list = as->next;
1596 else {
1597 struct apm_user *as1;
1598
1599 for (as1 = user_list;
1600 (as1 != NULL) && (as1->next != as);
1601 as1 = as1->next)
1602 ;
1603 if (as1 == NULL)
1604 pr_err("filp not in user list\n");
1605 else
1606 as1->next = as->next;
1607 }
1608 spin_unlock(&user_list_lock);
1609 kfree(as);
1610 return 0;
1611 }
1612
1613 static int do_open(struct inode *inode, struct file *filp)
1614 {
1615 struct apm_user *as;
1616
1617 as = kmalloc(sizeof(*as), GFP_KERNEL);
1618 if (as == NULL)
1619 return -ENOMEM;
1620
1621 as->magic = APM_BIOS_MAGIC;
1622 as->event_tail = as->event_head = 0;
1623 as->suspends_pending = as->standbys_pending = 0;
1624 as->suspends_read = as->standbys_read = 0;
1625 /*
1626 * XXX - this is a tiny bit broken, when we consider BSD
1627 * process accounting. If the device is opened by root, we
1628 * instantly flag that we used superuser privs. Who knows,
1629 * we might close the device immediately without doing a
1630 * privileged operation -- cevans
1631 */
1632 as->suser = capable(CAP_SYS_ADMIN);
1633 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1634 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1635 spin_lock(&user_list_lock);
1636 as->next = user_list;
1637 user_list = as;
1638 spin_unlock(&user_list_lock);
1639 filp->private_data = as;
1640 return 0;
1641 }
1642
1643 static int proc_apm_show(struct seq_file *m, void *v)
1644 {
1645 unsigned short bx;
1646 unsigned short cx;
1647 unsigned short dx;
1648 int error;
1649 unsigned short ac_line_status = 0xff;
1650 unsigned short battery_status = 0xff;
1651 unsigned short battery_flag = 0xff;
1652 int percentage = -1;
1653 int time_units = -1;
1654 char *units = "?";
1655
1656 if ((num_online_cpus() == 1) &&
1657 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1658 ac_line_status = (bx >> 8) & 0xff;
1659 battery_status = bx & 0xff;
1660 if ((cx & 0xff) != 0xff)
1661 percentage = cx & 0xff;
1662
1663 if (apm_info.connection_version > 0x100) {
1664 battery_flag = (cx >> 8) & 0xff;
1665 if (dx != 0xffff) {
1666 units = (dx & 0x8000) ? "min" : "sec";
1667 time_units = dx & 0x7fff;
1668 }
1669 }
1670 }
1671 /* Arguments, with symbols from linux/apm_bios.h. Information is
1672 from the Get Power Status (0x0a) call unless otherwise noted.
1673
1674 0) Linux driver version (this will change if format changes)
1675 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1676 2) APM flags from APM Installation Check (0x00):
1677 bit 0: APM_16_BIT_SUPPORT
1678 bit 1: APM_32_BIT_SUPPORT
1679 bit 2: APM_IDLE_SLOWS_CLOCK
1680 bit 3: APM_BIOS_DISABLED
1681 bit 4: APM_BIOS_DISENGAGED
1682 3) AC line status
1683 0x00: Off-line
1684 0x01: On-line
1685 0x02: On backup power (BIOS >= 1.1 only)
1686 0xff: Unknown
1687 4) Battery status
1688 0x00: High
1689 0x01: Low
1690 0x02: Critical
1691 0x03: Charging
1692 0x04: Selected battery not present (BIOS >= 1.2 only)
1693 0xff: Unknown
1694 5) Battery flag
1695 bit 0: High
1696 bit 1: Low
1697 bit 2: Critical
1698 bit 3: Charging
1699 bit 7: No system battery
1700 0xff: Unknown
1701 6) Remaining battery life (percentage of charge):
1702 0-100: valid
1703 -1: Unknown
1704 7) Remaining battery life (time units):
1705 Number of remaining minutes or seconds
1706 -1: Unknown
1707 8) min = minutes; sec = seconds */
1708
1709 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1710 driver_version,
1711 (apm_info.bios.version >> 8) & 0xff,
1712 apm_info.bios.version & 0xff,
1713 apm_info.bios.flags,
1714 ac_line_status,
1715 battery_status,
1716 battery_flag,
1717 percentage,
1718 time_units,
1719 units);
1720 return 0;
1721 }
1722
1723 static int proc_apm_open(struct inode *inode, struct file *file)
1724 {
1725 return single_open(file, proc_apm_show, NULL);
1726 }
1727
1728 static const struct file_operations apm_file_ops = {
1729 .owner = THIS_MODULE,
1730 .open = proc_apm_open,
1731 .read = seq_read,
1732 .llseek = seq_lseek,
1733 .release = single_release,
1734 };
1735
1736 static int apm(void *unused)
1737 {
1738 unsigned short bx;
1739 unsigned short cx;
1740 unsigned short dx;
1741 int error;
1742 char *power_stat;
1743 char *bat_stat;
1744
1745 /* 2002/08/01 - WT
1746 * This is to avoid random crashes at boot time during initialization
1747 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1748 * Some bioses don't like being called from CPU != 0.
1749 * Method suggested by Ingo Molnar.
1750 */
1751 set_cpus_allowed_ptr(current, cpumask_of(0));
1752 BUG_ON(smp_processor_id() != 0);
1753
1754 if (apm_info.connection_version == 0) {
1755 apm_info.connection_version = apm_info.bios.version;
1756 if (apm_info.connection_version > 0x100) {
1757 /*
1758 * We only support BIOSs up to version 1.2
1759 */
1760 if (apm_info.connection_version > 0x0102)
1761 apm_info.connection_version = 0x0102;
1762 error = apm_driver_version(&apm_info.connection_version);
1763 if (error != APM_SUCCESS) {
1764 apm_error("driver version", error);
1765 /* Fall back to an APM 1.0 connection. */
1766 apm_info.connection_version = 0x100;
1767 }
1768 }
1769 }
1770
1771 if (debug)
1772 printk(KERN_INFO "apm: Connection version %d.%d\n",
1773 (apm_info.connection_version >> 8) & 0xff,
1774 apm_info.connection_version & 0xff);
1775
1776 #ifdef CONFIG_APM_DO_ENABLE
1777 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1778 /*
1779 * This call causes my NEC UltraLite Versa 33/C to hang if it
1780 * is booted with PM disabled but not in the docking station.
1781 * Unfortunate ...
1782 */
1783 error = apm_enable_power_management(1);
1784 if (error) {
1785 apm_error("enable power management", error);
1786 return -1;
1787 }
1788 }
1789 #endif
1790
1791 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1792 && (apm_info.connection_version > 0x0100)) {
1793 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1794 if (error) {
1795 apm_error("engage power management", error);
1796 return -1;
1797 }
1798 }
1799
1800 if (debug && (num_online_cpus() == 1 || smp)) {
1801 error = apm_get_power_status(&bx, &cx, &dx);
1802 if (error)
1803 printk(KERN_INFO "apm: power status not available\n");
1804 else {
1805 switch ((bx >> 8) & 0xff) {
1806 case 0:
1807 power_stat = "off line";
1808 break;
1809 case 1:
1810 power_stat = "on line";
1811 break;
1812 case 2:
1813 power_stat = "on backup power";
1814 break;
1815 default:
1816 power_stat = "unknown";
1817 break;
1818 }
1819 switch (bx & 0xff) {
1820 case 0:
1821 bat_stat = "high";
1822 break;
1823 case 1:
1824 bat_stat = "low";
1825 break;
1826 case 2:
1827 bat_stat = "critical";
1828 break;
1829 case 3:
1830 bat_stat = "charging";
1831 break;
1832 default:
1833 bat_stat = "unknown";
1834 break;
1835 }
1836 printk(KERN_INFO
1837 "apm: AC %s, battery status %s, battery life ",
1838 power_stat, bat_stat);
1839 if ((cx & 0xff) == 0xff)
1840 printk("unknown\n");
1841 else
1842 printk("%d%%\n", cx & 0xff);
1843 if (apm_info.connection_version > 0x100) {
1844 printk(KERN_INFO
1845 "apm: battery flag 0x%02x, battery life ",
1846 (cx >> 8) & 0xff);
1847 if (dx == 0xffff)
1848 printk("unknown\n");
1849 else
1850 printk("%d %s\n", dx & 0x7fff,
1851 (dx & 0x8000) ?
1852 "minutes" : "seconds");
1853 }
1854 }
1855 }
1856
1857 /* Install our power off handler.. */
1858 if (power_off)
1859 pm_power_off = apm_power_off;
1860
1861 if (num_online_cpus() == 1 || smp) {
1862 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1863 console_blank_hook = apm_console_blank;
1864 #endif
1865 apm_mainloop();
1866 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1867 console_blank_hook = NULL;
1868 #endif
1869 }
1870
1871 return 0;
1872 }
1873
1874 #ifndef MODULE
1875 static int __init apm_setup(char *str)
1876 {
1877 int invert;
1878
1879 while ((str != NULL) && (*str != '\0')) {
1880 if (strncmp(str, "off", 3) == 0)
1881 apm_disabled = 1;
1882 if (strncmp(str, "on", 2) == 0)
1883 apm_disabled = 0;
1884 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1885 (strncmp(str, "bounce_interval=", 16) == 0))
1886 bounce_interval = simple_strtol(str + 16, NULL, 0);
1887 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1888 (strncmp(str, "idle_threshold=", 15) == 0))
1889 idle_threshold = simple_strtol(str + 15, NULL, 0);
1890 if ((strncmp(str, "idle-period=", 12) == 0) ||
1891 (strncmp(str, "idle_period=", 12) == 0))
1892 idle_period = simple_strtol(str + 12, NULL, 0);
1893 invert = (strncmp(str, "no-", 3) == 0) ||
1894 (strncmp(str, "no_", 3) == 0);
1895 if (invert)
1896 str += 3;
1897 if (strncmp(str, "debug", 5) == 0)
1898 debug = !invert;
1899 if ((strncmp(str, "power-off", 9) == 0) ||
1900 (strncmp(str, "power_off", 9) == 0))
1901 power_off = !invert;
1902 if (strncmp(str, "smp", 3) == 0) {
1903 smp = !invert;
1904 idle_threshold = 100;
1905 }
1906 if ((strncmp(str, "allow-ints", 10) == 0) ||
1907 (strncmp(str, "allow_ints", 10) == 0))
1908 apm_info.allow_ints = !invert;
1909 if ((strncmp(str, "broken-psr", 10) == 0) ||
1910 (strncmp(str, "broken_psr", 10) == 0))
1911 apm_info.get_power_status_broken = !invert;
1912 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1913 (strncmp(str, "realmode_power_off", 18) == 0))
1914 apm_info.realmode_power_off = !invert;
1915 str = strchr(str, ',');
1916 if (str != NULL)
1917 str += strspn(str, ", \t");
1918 }
1919 return 1;
1920 }
1921
1922 __setup("apm=", apm_setup);
1923 #endif
1924
1925 static const struct file_operations apm_bios_fops = {
1926 .owner = THIS_MODULE,
1927 .read = do_read,
1928 .poll = do_poll,
1929 .unlocked_ioctl = do_ioctl,
1930 .open = do_open,
1931 .release = do_release,
1932 .llseek = noop_llseek,
1933 };
1934
1935 static struct miscdevice apm_device = {
1936 APM_MINOR_DEV,
1937 "apm_bios",
1938 &apm_bios_fops
1939 };
1940
1941
1942 /* Simple "print if true" callback */
1943 static int __init print_if_true(const struct dmi_system_id *d)
1944 {
1945 printk("%s\n", d->ident);
1946 return 0;
1947 }
1948
1949 /*
1950 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1951 * disabled before the suspend. Linux used to get terribly confused by that.
1952 */
1953 static int __init broken_ps2_resume(const struct dmi_system_id *d)
1954 {
1955 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1956 "workaround hopefully not needed.\n", d->ident);
1957 return 0;
1958 }
1959
1960 /* Some bioses have a broken protected mode poweroff and need to use realmode */
1961 static int __init set_realmode_power_off(const struct dmi_system_id *d)
1962 {
1963 if (apm_info.realmode_power_off == 0) {
1964 apm_info.realmode_power_off = 1;
1965 printk(KERN_INFO "%s bios detected. "
1966 "Using realmode poweroff only.\n", d->ident);
1967 }
1968 return 0;
1969 }
1970
1971 /* Some laptops require interrupts to be enabled during APM calls */
1972 static int __init set_apm_ints(const struct dmi_system_id *d)
1973 {
1974 if (apm_info.allow_ints == 0) {
1975 apm_info.allow_ints = 1;
1976 printk(KERN_INFO "%s machine detected. "
1977 "Enabling interrupts during APM calls.\n", d->ident);
1978 }
1979 return 0;
1980 }
1981
1982 /* Some APM bioses corrupt memory or just plain do not work */
1983 static int __init apm_is_horked(const struct dmi_system_id *d)
1984 {
1985 if (apm_info.disabled == 0) {
1986 apm_info.disabled = 1;
1987 printk(KERN_INFO "%s machine detected. "
1988 "Disabling APM.\n", d->ident);
1989 }
1990 return 0;
1991 }
1992
1993 static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1994 {
1995 if (apm_info.disabled == 0) {
1996 apm_info.disabled = 1;
1997 printk(KERN_INFO "%s machine detected. "
1998 "Disabling APM.\n", d->ident);
1999 printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
2000 printk(KERN_INFO "download from support.intel.com\n");
2001 }
2002 return 0;
2003 }
2004
2005 /* Some APM bioses hang on APM idle calls */
2006 static int __init apm_likes_to_melt(const struct dmi_system_id *d)
2007 {
2008 if (apm_info.forbid_idle == 0) {
2009 apm_info.forbid_idle = 1;
2010 printk(KERN_INFO "%s machine detected. "
2011 "Disabling APM idle calls.\n", d->ident);
2012 }
2013 return 0;
2014 }
2015
2016 /*
2017 * Check for clue free BIOS implementations who use
2018 * the following QA technique
2019 *
2020 * [ Write BIOS Code ]<------
2021 * | ^
2022 * < Does it Compile >----N--
2023 * |Y ^
2024 * < Does it Boot Win98 >-N--
2025 * |Y
2026 * [Ship It]
2027 *
2028 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
2029 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
2030 */
2031 static int __init broken_apm_power(const struct dmi_system_id *d)
2032 {
2033 apm_info.get_power_status_broken = 1;
2034 printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2035 "disabling power status reporting.\n");
2036 return 0;
2037 }
2038
2039 /*
2040 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2041 * have this problem).
2042 */
2043 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2044 {
2045 apm_info.get_power_status_swabinminutes = 1;
2046 printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2047 "in minutes and wrong byte order.\n");
2048 return 0;
2049 }
2050
2051 static const struct dmi_system_id apm_dmi_table[] __initconst = {
2052 {
2053 print_if_true,
2054 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2055 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2056 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2057 },
2058 { /* Handle problems with APM on the C600 */
2059 broken_ps2_resume, "Dell Latitude C600",
2060 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2061 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2062 },
2063 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2064 set_apm_ints, "Dell Latitude",
2065 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2066 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2067 },
2068 { /* APM crashes */
2069 apm_is_horked, "Dell Inspiron 2500",
2070 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2071 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2072 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2073 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2074 },
2075 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2076 set_apm_ints, "Dell Inspiron", {
2077 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2078 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2079 },
2080 { /* Handle problems with APM on Inspiron 5000e */
2081 broken_apm_power, "Dell Inspiron 5000e",
2082 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2083 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2084 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2085 },
2086 { /* Handle problems with APM on Inspiron 2500 */
2087 broken_apm_power, "Dell Inspiron 2500",
2088 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2089 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2090 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2091 },
2092 { /* APM crashes */
2093 apm_is_horked, "Dell Dimension 4100",
2094 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2095 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2096 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2097 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2098 },
2099 { /* Allow interrupts during suspend on Compaq Laptops*/
2100 set_apm_ints, "Compaq 12XL125",
2101 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2102 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2103 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2104 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2105 },
2106 { /* Allow interrupts during APM or the clock goes slow */
2107 set_apm_ints, "ASUSTeK",
2108 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2109 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2110 },
2111 { /* APM blows on shutdown */
2112 apm_is_horked, "ABIT KX7-333[R]",
2113 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2114 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2115 },
2116 { /* APM crashes */
2117 apm_is_horked, "Trigem Delhi3",
2118 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2119 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2120 },
2121 { /* APM crashes */
2122 apm_is_horked, "Fujitsu-Siemens",
2123 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2124 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2125 },
2126 { /* APM crashes */
2127 apm_is_horked_d850md, "Intel D850MD",
2128 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2129 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2130 },
2131 { /* APM crashes */
2132 apm_is_horked, "Intel D810EMO",
2133 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2134 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2135 },
2136 { /* APM crashes */
2137 apm_is_horked, "Dell XPS-Z",
2138 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2139 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2140 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2141 },
2142 { /* APM crashes */
2143 apm_is_horked, "Sharp PC-PJ/AX",
2144 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2145 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2146 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2147 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2148 },
2149 { /* APM crashes */
2150 apm_is_horked, "Dell Inspiron 2500",
2151 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2152 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2153 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2154 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2155 },
2156 { /* APM idle hangs */
2157 apm_likes_to_melt, "Jabil AMD",
2158 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2159 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2160 },
2161 { /* APM idle hangs */
2162 apm_likes_to_melt, "AMI Bios",
2163 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2164 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2165 },
2166 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2167 swab_apm_power_in_minutes, "Sony VAIO",
2168 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2169 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2170 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2171 },
2172 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2173 swab_apm_power_in_minutes, "Sony VAIO",
2174 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2175 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2176 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2177 },
2178 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2179 swab_apm_power_in_minutes, "Sony VAIO",
2180 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2181 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2182 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2183 },
2184 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2185 swab_apm_power_in_minutes, "Sony VAIO",
2186 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2187 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2188 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2189 },
2190 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2191 swab_apm_power_in_minutes, "Sony VAIO",
2192 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2193 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2194 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2195 },
2196 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2197 swab_apm_power_in_minutes, "Sony VAIO",
2198 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2199 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2200 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2201 },
2202 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2203 swab_apm_power_in_minutes, "Sony VAIO",
2204 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2205 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2206 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2207 },
2208 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2209 swab_apm_power_in_minutes, "Sony VAIO",
2210 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2211 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2212 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2213 },
2214 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2215 swab_apm_power_in_minutes, "Sony VAIO",
2216 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2217 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2218 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2219 },
2220 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2221 swab_apm_power_in_minutes, "Sony VAIO",
2222 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2223 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2224 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2225 },
2226
2227 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2228 swab_apm_power_in_minutes, "Sony VAIO",
2229 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2230 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2231 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2232 },
2233 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2234 swab_apm_power_in_minutes, "Sony VAIO",
2235 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2236 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2237 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2238 },
2239 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2240 swab_apm_power_in_minutes, "Sony VAIO",
2241 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2242 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2243 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2244 },
2245 { /* broken PM poweroff bios */
2246 set_realmode_power_off, "Award Software v4.60 PGMA",
2247 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2248 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2249 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2250 },
2251
2252 /* Generic per vendor APM settings */
2253
2254 { /* Allow interrupts during suspend on IBM laptops */
2255 set_apm_ints, "IBM",
2256 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2257 },
2258
2259 { }
2260 };
2261
2262 /*
2263 * Just start the APM thread. We do NOT want to do APM BIOS
2264 * calls from anything but the APM thread, if for no other reason
2265 * than the fact that we don't trust the APM BIOS. This way,
2266 * most common APM BIOS problems that lead to protection errors
2267 * etc will have at least some level of being contained...
2268 *
2269 * In short, if something bad happens, at least we have a choice
2270 * of just killing the apm thread..
2271 */
2272 static int __init apm_init(void)
2273 {
2274 struct desc_struct *gdt;
2275 int err;
2276
2277 dmi_check_system(apm_dmi_table);
2278
2279 if (apm_info.bios.version == 0 || machine_is_olpc()) {
2280 printk(KERN_INFO "apm: BIOS not found.\n");
2281 return -ENODEV;
2282 }
2283 printk(KERN_INFO
2284 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2285 ((apm_info.bios.version >> 8) & 0xff),
2286 (apm_info.bios.version & 0xff),
2287 apm_info.bios.flags,
2288 driver_version);
2289 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2290 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2291 return -ENODEV;
2292 }
2293
2294 if (allow_ints)
2295 apm_info.allow_ints = 1;
2296 if (broken_psr)
2297 apm_info.get_power_status_broken = 1;
2298 if (realmode_power_off)
2299 apm_info.realmode_power_off = 1;
2300 /* User can override, but default is to trust DMI */
2301 if (apm_disabled != -1)
2302 apm_info.disabled = apm_disabled;
2303
2304 /*
2305 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2306 * but is reportedly a 1.0 BIOS.
2307 */
2308 if (apm_info.bios.version == 0x001)
2309 apm_info.bios.version = 0x100;
2310
2311 /* BIOS < 1.2 doesn't set cseg_16_len */
2312 if (apm_info.bios.version < 0x102)
2313 apm_info.bios.cseg_16_len = 0; /* 64k */
2314
2315 if (debug) {
2316 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2317 apm_info.bios.cseg, apm_info.bios.offset,
2318 apm_info.bios.cseg_16, apm_info.bios.dseg);
2319 if (apm_info.bios.version > 0x100)
2320 printk(" cseg len %x, dseg len %x",
2321 apm_info.bios.cseg_len,
2322 apm_info.bios.dseg_len);
2323 if (apm_info.bios.version > 0x101)
2324 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2325 printk("\n");
2326 }
2327
2328 if (apm_info.disabled) {
2329 pr_notice("disabled on user request.\n");
2330 return -ENODEV;
2331 }
2332 if ((num_online_cpus() > 1) && !power_off && !smp) {
2333 pr_notice("disabled - APM is not SMP safe.\n");
2334 apm_info.disabled = 1;
2335 return -ENODEV;
2336 }
2337 if (!acpi_disabled) {
2338 pr_notice("overridden by ACPI.\n");
2339 apm_info.disabled = 1;
2340 return -ENODEV;
2341 }
2342
2343 /*
2344 * Set up the long jump entry point to the APM BIOS, which is called
2345 * from inline assembly.
2346 */
2347 apm_bios_entry.offset = apm_info.bios.offset;
2348 apm_bios_entry.segment = APM_CS;
2349
2350 /*
2351 * The APM 1.1 BIOS is supposed to provide limit information that it
2352 * recognizes. Many machines do this correctly, but many others do
2353 * not restrict themselves to their claimed limit. When this happens,
2354 * they will cause a segmentation violation in the kernel at boot time.
2355 * Most BIOS's, however, will respect a 64k limit, so we use that.
2356 *
2357 * Note we only set APM segments on CPU zero, since we pin the APM
2358 * code to that CPU.
2359 */
2360 gdt = get_cpu_gdt_rw(0);
2361 set_desc_base(&gdt[APM_CS >> 3],
2362 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2363 set_desc_base(&gdt[APM_CS_16 >> 3],
2364 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2365 set_desc_base(&gdt[APM_DS >> 3],
2366 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2367
2368 proc_create("apm", 0, NULL, &apm_file_ops);
2369
2370 kapmd_task = kthread_create(apm, NULL, "kapmd");
2371 if (IS_ERR(kapmd_task)) {
2372 pr_err("disabled - Unable to start kernel thread\n");
2373 err = PTR_ERR(kapmd_task);
2374 kapmd_task = NULL;
2375 remove_proc_entry("apm", NULL);
2376 return err;
2377 }
2378 wake_up_process(kapmd_task);
2379
2380 if (num_online_cpus() > 1 && !smp) {
2381 printk(KERN_NOTICE
2382 "apm: disabled - APM is not SMP safe (power off active).\n");
2383 return 0;
2384 }
2385
2386 /*
2387 * Note we don't actually care if the misc_device cannot be registered.
2388 * this driver can do its job without it, even if userspace can't
2389 * control it. just log the error
2390 */
2391 if (misc_register(&apm_device))
2392 printk(KERN_WARNING "apm: Could not register misc device.\n");
2393
2394 if (HZ != 100)
2395 idle_period = (idle_period * HZ) / 100;
2396 if (idle_threshold < 100) {
2397 cpuidle_poll_state_init(&apm_idle_driver);
2398 if (!cpuidle_register_driver(&apm_idle_driver))
2399 if (cpuidle_register_device(&apm_cpuidle_device))
2400 cpuidle_unregister_driver(&apm_idle_driver);
2401 }
2402
2403 return 0;
2404 }
2405
2406 static void __exit apm_exit(void)
2407 {
2408 int error;
2409
2410 cpuidle_unregister_device(&apm_cpuidle_device);
2411 cpuidle_unregister_driver(&apm_idle_driver);
2412
2413 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2414 && (apm_info.connection_version > 0x0100)) {
2415 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2416 if (error)
2417 apm_error("disengage power management", error);
2418 }
2419 misc_deregister(&apm_device);
2420 remove_proc_entry("apm", NULL);
2421 if (power_off)
2422 pm_power_off = NULL;
2423 if (kapmd_task) {
2424 kthread_stop(kapmd_task);
2425 kapmd_task = NULL;
2426 }
2427 }
2428
2429 module_init(apm_init);
2430 module_exit(apm_exit);
2431
2432 MODULE_AUTHOR("Stephen Rothwell");
2433 MODULE_DESCRIPTION("Advanced Power Management");
2434 MODULE_LICENSE("GPL");
2435 module_param(debug, bool, 0644);
2436 MODULE_PARM_DESC(debug, "Enable debug mode");
2437 module_param(power_off, bool, 0444);
2438 MODULE_PARM_DESC(power_off, "Enable power off");
2439 module_param(bounce_interval, int, 0444);
2440 MODULE_PARM_DESC(bounce_interval,
2441 "Set the number of ticks to ignore suspend bounces");
2442 module_param(allow_ints, bool, 0444);
2443 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2444 module_param(broken_psr, bool, 0444);
2445 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2446 module_param(realmode_power_off, bool, 0444);
2447 MODULE_PARM_DESC(realmode_power_off,
2448 "Switch to real mode before powering off");
2449 module_param(idle_threshold, int, 0444);
2450 MODULE_PARM_DESC(idle_threshold,
2451 "System idle percentage above which to make APM BIOS idle calls");
2452 module_param(idle_period, int, 0444);
2453 MODULE_PARM_DESC(idle_period,
2454 "Period (in sec/100) over which to caculate the idle percentage");
2455 module_param(smp, bool, 0444);
2456 MODULE_PARM_DESC(smp,
2457 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2458 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
Linux with added FPC-III support