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Linux 4.6-rc6
[linux/fpc-iii.git] / arch / x86 / kernel / apm_32.c
blob9307f182fe3049f8e4f1c3d38bb9b1ebb3008d26
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 #include <linux/cpuidle.h>
236
237 #include <asm/uaccess.h>
238 #include <asm/desc.h>
239 #include <asm/olpc.h>
240 #include <asm/paravirt.h>
241 #include <asm/reboot.h>
242
243 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
244 extern int (*console_blank_hook)(int);
245 #endif
246
247 /*
248 * The apm_bios device is one of the misc char devices.
249 * This is its minor number.
250 */
251 #define APM_MINOR_DEV 134
252
253 /*
254 * Various options can be changed at boot time as follows:
255 * (We allow underscores for compatibility with the modules code)
256 * apm=on/off enable/disable APM
257 * [no-]allow[-_]ints allow interrupts during BIOS calls
258 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
259 * [no-]realmode[-_]power[-_]off switch to real mode before
260 * powering off
261 * [no-]debug log some debugging messages
262 * [no-]power[-_]off power off on shutdown
263 * [no-]smp Use apm even on an SMP box
264 * bounce[-_]interval=<n> number of ticks to ignore suspend
265 * bounces
266 * idle[-_]threshold=<n> System idle percentage above which to
267 * make APM BIOS idle calls. Set it to
268 * 100 to disable.
269 * idle[-_]period=<n> Period (in 1/100s of a second) over
270 * which the idle percentage is
271 * calculated.
272 */
273
274 /* KNOWN PROBLEM MACHINES:
275 *
276 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
277 * [Confirmed by TI representative]
278 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
279 * [Confirmed by BIOS disassembly]
280 * [This may work now ...]
281 * P: Toshiba 1950S: battery life information only gets updated after resume
282 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
283 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
284 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
285 * Neale Banks <neale@lowendale.com.au> December 2000
286 *
287 * Legend: U = unusable with APM patches
288 * P = partially usable with APM patches
289 */
290
291 /*
292 * Define as 1 to make the driver always call the APM BIOS busy
293 * routine even if the clock was not reported as slowed by the
294 * idle routine. Otherwise, define as 0.
295 */
296 #define ALWAYS_CALL_BUSY 1
297
298 /*
299 * Define to make the APM BIOS calls zero all data segment registers (so
300 * that an incorrect BIOS implementation will cause a kernel panic if it
301 * tries to write to arbitrary memory).
302 */
303 #define APM_ZERO_SEGS
304
305 #include <asm/apm.h>
306
307 /*
308 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
309 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
310 * David Chen <chen@ctpa04.mit.edu>
311 */
312 #undef INIT_TIMER_AFTER_SUSPEND
313
314 #ifdef INIT_TIMER_AFTER_SUSPEND
315 #include <linux/timex.h>
316 #include <asm/io.h>
317 #include <linux/delay.h>
318 #endif
319
320 /*
321 * Need to poll the APM BIOS every second
322 */
323 #define APM_CHECK_TIMEOUT (HZ)
324
325 /*
326 * Ignore suspend events for this amount of time after a resume
327 */
328 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
329
330 /*
331 * Maximum number of events stored
332 */
333 #define APM_MAX_EVENTS 20
334
335 /*
336 * The per-file APM data
337 */
338 struct apm_user {
339 int magic;
340 struct apm_user *next;
341 unsigned int suser: 1;
342 unsigned int writer: 1;
343 unsigned int reader: 1;
344 unsigned int suspend_wait: 1;
345 int suspend_result;
346 int suspends_pending;
347 int standbys_pending;
348 int suspends_read;
349 int standbys_read;
350 int event_head;
351 int event_tail;
352 apm_event_t events[APM_MAX_EVENTS];
353 };
354
355 /*
356 * The magic number in apm_user
357 */
358 #define APM_BIOS_MAGIC 0x4101
359
360 /*
361 * idle percentage above which bios idle calls are done
362 */
363 #ifdef CONFIG_APM_CPU_IDLE
364 #define DEFAULT_IDLE_THRESHOLD 95
365 #else
366 #define DEFAULT_IDLE_THRESHOLD 100
367 #endif
368 #define DEFAULT_IDLE_PERIOD (100 / 3)
369
370 static int apm_cpu_idle(struct cpuidle_device *dev,
371 struct cpuidle_driver *drv, int index);
372
373 static struct cpuidle_driver apm_idle_driver = {
374 .name = "apm_idle",
375 .owner = THIS_MODULE,
376 .states = {
377 { /* entry 0 is for polling */ },
378 { /* entry 1 is for APM idle */
379 .name = "APM",
380 .desc = "APM idle",
381 .exit_latency = 250, /* WAG */
382 .target_residency = 500, /* WAG */
383 .enter = &apm_cpu_idle
384 },
385 },
386 .state_count = 2,
387 };
388
389 static struct cpuidle_device apm_cpuidle_device;
390
391 /*
392 * Local variables
393 */
394 __visible struct {
395 unsigned long offset;
396 unsigned short segment;
397 } apm_bios_entry;
398 static int clock_slowed;
399 static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
400 static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
401 static int suspends_pending;
402 static int standbys_pending;
403 static int ignore_sys_suspend;
404 static int ignore_normal_resume;
405 static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
406
407 static bool debug __read_mostly;
408 static bool smp __read_mostly;
409 static int apm_disabled = -1;
410 #ifdef CONFIG_SMP
411 static bool power_off;
412 #else
413 static bool power_off = 1;
414 #endif
415 static bool realmode_power_off;
416 #ifdef CONFIG_APM_ALLOW_INTS
417 static bool allow_ints = 1;
418 #else
419 static bool allow_ints;
420 #endif
421 static bool broken_psr;
422
423 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
424 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
425 static struct apm_user *user_list;
426 static DEFINE_SPINLOCK(user_list_lock);
427 static DEFINE_MUTEX(apm_mutex);
428
429 /*
430 * Set up a segment that references the real mode segment 0x40
431 * that extends up to the end of page zero (that we have reserved).
432 * This is for buggy BIOS's that refer to (real mode) segment 0x40
433 * even though they are called in protected mode.
434 */
435 static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
436 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
437
438 static const char driver_version[] = "1.16ac"; /* no spaces */
439
440 static struct task_struct *kapmd_task;
441
442 /*
443 * APM event names taken from the APM 1.2 specification. These are
444 * the message codes that the BIOS uses to tell us about events
445 */
446 static const char * const apm_event_name[] = {
447 "system standby",
448 "system suspend",
449 "normal resume",
450 "critical resume",
451 "low battery",
452 "power status change",
453 "update time",
454 "critical suspend",
455 "user standby",
456 "user suspend",
457 "system standby resume",
458 "capabilities change"
459 };
460 #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
461
462 typedef struct lookup_t {
463 int key;
464 char *msg;
465 } lookup_t;
466
467 /*
468 * The BIOS returns a set of standard error codes in AX when the
469 * carry flag is set.
470 */
471
472 static const lookup_t error_table[] = {
473 /* N/A { APM_SUCCESS, "Operation succeeded" }, */
474 { APM_DISABLED, "Power management disabled" },
475 { APM_CONNECTED, "Real mode interface already connected" },
476 { APM_NOT_CONNECTED, "Interface not connected" },
477 { APM_16_CONNECTED, "16 bit interface already connected" },
478 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
479 { APM_32_CONNECTED, "32 bit interface already connected" },
480 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
481 { APM_BAD_DEVICE, "Unrecognized device ID" },
482 { APM_BAD_PARAM, "Parameter out of range" },
483 { APM_NOT_ENGAGED, "Interface not engaged" },
484 { APM_BAD_FUNCTION, "Function not supported" },
485 { APM_RESUME_DISABLED, "Resume timer disabled" },
486 { APM_BAD_STATE, "Unable to enter requested state" },
487 /* N/A { APM_NO_EVENTS, "No events pending" }, */
488 { APM_NO_ERROR, "BIOS did not set a return code" },
489 { APM_NOT_PRESENT, "No APM present" }
490 };
491 #define ERROR_COUNT ARRAY_SIZE(error_table)
492
493 /**
494 * apm_error - display an APM error
495 * @str: information string
496 * @err: APM BIOS return code
497 *
498 * Write a meaningful log entry to the kernel log in the event of
499 * an APM error. Note that this also handles (negative) kernel errors.
500 */
501
502 static void apm_error(char *str, int err)
503 {
504 int i;
505
506 for (i = 0; i < ERROR_COUNT; i++)
507 if (error_table[i].key == err)
508 break;
509 if (i < ERROR_COUNT)
510 pr_notice("%s: %s\n", str, error_table[i].msg);
511 else if (err < 0)
512 pr_notice("%s: linux error code %i\n", str, err);
513 else
514 pr_notice("%s: unknown error code %#2.2x\n",
515 str, err);
516 }
517
518 /*
519 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
520 * apm_info.allow_ints, we are being really paranoid here! Not only
521 * are interrupts disabled, but all the segment registers (except SS)
522 * are saved and zeroed this means that if the BIOS tries to reference
523 * any data without explicitly loading the segment registers, the kernel
524 * will fault immediately rather than have some unforeseen circumstances
525 * for the rest of the kernel. And it will be very obvious! :-) Doing
526 * this depends on CS referring to the same physical memory as DS so that
527 * DS can be zeroed before the call. Unfortunately, we can't do anything
528 * about the stack segment/pointer. Also, we tell the compiler that
529 * everything could change.
530 *
531 * Also, we KNOW that for the non error case of apm_bios_call, there
532 * is no useful data returned in the low order 8 bits of eax.
533 */
534
535 static inline unsigned long __apm_irq_save(void)
536 {
537 unsigned long flags;
538 local_save_flags(flags);
539 if (apm_info.allow_ints) {
540 if (irqs_disabled_flags(flags))
541 local_irq_enable();
542 } else
543 local_irq_disable();
544
545 return flags;
546 }
547
548 #define apm_irq_save(flags) \
549 do { flags = __apm_irq_save(); } while (0)
550
551 static inline void apm_irq_restore(unsigned long flags)
552 {
553 if (irqs_disabled_flags(flags))
554 local_irq_disable();
555 else if (irqs_disabled())
556 local_irq_enable();
557 }
558
559 #ifdef APM_ZERO_SEGS
560 # define APM_DECL_SEGS \
561 unsigned int saved_fs; unsigned int saved_gs;
562 # define APM_DO_SAVE_SEGS \
563 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
564 # define APM_DO_RESTORE_SEGS \
565 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
566 #else
567 # define APM_DECL_SEGS
568 # define APM_DO_SAVE_SEGS
569 # define APM_DO_RESTORE_SEGS
570 #endif
571
572 struct apm_bios_call {
573 u32 func;
574 /* In and out */
575 u32 ebx;
576 u32 ecx;
577 /* Out only */
578 u32 eax;
579 u32 edx;
580 u32 esi;
581
582 /* Error: -ENOMEM, or bits 8-15 of eax */
583 int err;
584 };
585
586 /**
587 * __apm_bios_call - Make an APM BIOS 32bit call
588 * @_call: pointer to struct apm_bios_call.
589 *
590 * Make an APM call using the 32bit protected mode interface. The
591 * caller is responsible for knowing if APM BIOS is configured and
592 * enabled. This call can disable interrupts for a long period of
593 * time on some laptops. The return value is in AH and the carry
594 * flag is loaded into AL. If there is an error, then the error
595 * code is returned in AH (bits 8-15 of eax) and this function
596 * returns non-zero.
597 *
598 * Note: this makes the call on the current CPU.
599 */
600 static long __apm_bios_call(void *_call)
601 {
602 APM_DECL_SEGS
603 unsigned long flags;
604 int cpu;
605 struct desc_struct save_desc_40;
606 struct desc_struct *gdt;
607 struct apm_bios_call *call = _call;
608
609 cpu = get_cpu();
610 BUG_ON(cpu != 0);
611 gdt = get_cpu_gdt_table(cpu);
612 save_desc_40 = gdt[0x40 / 8];
613 gdt[0x40 / 8] = bad_bios_desc;
614
615 apm_irq_save(flags);
616 APM_DO_SAVE_SEGS;
617 apm_bios_call_asm(call->func, call->ebx, call->ecx,
618 &call->eax, &call->ebx, &call->ecx, &call->edx,
619 &call->esi);
620 APM_DO_RESTORE_SEGS;
621 apm_irq_restore(flags);
622 gdt[0x40 / 8] = save_desc_40;
623 put_cpu();
624
625 return call->eax & 0xff;
626 }
627
628 /* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
629 static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
630 {
631 int ret;
632
633 /* Don't bother with work_on_cpu in the common case, so we don't
634 * have to worry about OOM or overhead. */
635 if (get_cpu() == 0) {
636 ret = fn(call);
637 put_cpu();
638 } else {
639 put_cpu();
640 ret = work_on_cpu(0, fn, call);
641 }
642
643 /* work_on_cpu can fail with -ENOMEM */
644 if (ret < 0)
645 call->err = ret;
646 else
647 call->err = (call->eax >> 8) & 0xff;
648
649 return ret;
650 }
651
652 /**
653 * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0)
654 * @call: the apm_bios_call registers.
655 *
656 * If there is an error, it is returned in @call.err.
657 */
658 static int apm_bios_call(struct apm_bios_call *call)
659 {
660 return on_cpu0(__apm_bios_call, call);
661 }
662
663 /**
664 * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
665 * @_call: pointer to struct apm_bios_call.
666 *
667 * Make a BIOS call that returns one value only, or just status.
668 * If there is an error, then the error code is returned in AH
669 * (bits 8-15 of eax) and this function returns non-zero (it can
670 * also return -ENOMEM). This is used for simpler BIOS operations.
671 * This call may hold interrupts off for a long time on some laptops.
672 *
673 * Note: this makes the call on the current CPU.
674 */
675 static long __apm_bios_call_simple(void *_call)
676 {
677 u8 error;
678 APM_DECL_SEGS
679 unsigned long flags;
680 int cpu;
681 struct desc_struct save_desc_40;
682 struct desc_struct *gdt;
683 struct apm_bios_call *call = _call;
684
685 cpu = get_cpu();
686 BUG_ON(cpu != 0);
687 gdt = get_cpu_gdt_table(cpu);
688 save_desc_40 = gdt[0x40 / 8];
689 gdt[0x40 / 8] = bad_bios_desc;
690
691 apm_irq_save(flags);
692 APM_DO_SAVE_SEGS;
693 error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
694 &call->eax);
695 APM_DO_RESTORE_SEGS;
696 apm_irq_restore(flags);
697 gdt[0x40 / 8] = save_desc_40;
698 put_cpu();
699 return error;
700 }
701
702 /**
703 * apm_bios_call_simple - make a simple APM BIOS 32bit call
704 * @func: APM function to invoke
705 * @ebx_in: EBX register value for BIOS call
706 * @ecx_in: ECX register value for BIOS call
707 * @eax: EAX register on return from the BIOS call
708 * @err: bits
709 *
710 * Make a BIOS call that returns one value only, or just status.
711 * If there is an error, then the error code is returned in @err
712 * and this function returns non-zero. This is used for simpler
713 * BIOS operations. This call may hold interrupts off for a long
714 * time on some laptops.
715 */
716 static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
717 int *err)
718 {
719 struct apm_bios_call call;
720 int ret;
721
722 call.func = func;
723 call.ebx = ebx_in;
724 call.ecx = ecx_in;
725
726 ret = on_cpu0(__apm_bios_call_simple, &call);
727 *eax = call.eax;
728 *err = call.err;
729 return ret;
730 }
731
732 /**
733 * apm_driver_version - APM driver version
734 * @val: loaded with the APM version on return
735 *
736 * Retrieve the APM version supported by the BIOS. This is only
737 * supported for APM 1.1 or higher. An error indicates APM 1.0 is
738 * probably present.
739 *
740 * On entry val should point to a value indicating the APM driver
741 * version with the high byte being the major and the low byte the
742 * minor number both in BCD
743 *
744 * On return it will hold the BIOS revision supported in the
745 * same format.
746 */
747
748 static int apm_driver_version(u_short *val)
749 {
750 u32 eax;
751 int err;
752
753 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
754 return err;
755 *val = eax;
756 return APM_SUCCESS;
757 }
758
759 /**
760 * apm_get_event - get an APM event from the BIOS
761 * @event: pointer to the event
762 * @info: point to the event information
763 *
764 * The APM BIOS provides a polled information for event
765 * reporting. The BIOS expects to be polled at least every second
766 * when events are pending. When a message is found the caller should
767 * poll until no more messages are present. However, this causes
768 * problems on some laptops where a suspend event notification is
769 * not cleared until it is acknowledged.
770 *
771 * Additional information is returned in the info pointer, providing
772 * that APM 1.2 is in use. If no messges are pending the value 0x80
773 * is returned (No power management events pending).
774 */
775 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
776 {
777 struct apm_bios_call call;
778
779 call.func = APM_FUNC_GET_EVENT;
780 call.ebx = call.ecx = 0;
781
782 if (apm_bios_call(&call))
783 return call.err;
784
785 *event = call.ebx;
786 if (apm_info.connection_version < 0x0102)
787 *info = ~0; /* indicate info not valid */
788 else
789 *info = call.ecx;
790 return APM_SUCCESS;
791 }
792
793 /**
794 * set_power_state - set the power management state
795 * @what: which items to transition
796 * @state: state to transition to
797 *
798 * Request an APM change of state for one or more system devices. The
799 * processor state must be transitioned last of all. what holds the
800 * class of device in the upper byte and the device number (0xFF for
801 * all) for the object to be transitioned.
802 *
803 * The state holds the state to transition to, which may in fact
804 * be an acceptance of a BIOS requested state change.
805 */
806
807 static int set_power_state(u_short what, u_short state)
808 {
809 u32 eax;
810 int err;
811
812 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
813 return err;
814 return APM_SUCCESS;
815 }
816
817 /**
818 * set_system_power_state - set system wide power state
819 * @state: which state to enter
820 *
821 * Transition the entire system into a new APM power state.
822 */
823
824 static int set_system_power_state(u_short state)
825 {
826 return set_power_state(APM_DEVICE_ALL, state);
827 }
828
829 /**
830 * apm_do_idle - perform power saving
831 *
832 * This function notifies the BIOS that the processor is (in the view
833 * of the OS) idle. It returns -1 in the event that the BIOS refuses
834 * to handle the idle request. On a success the function returns 1
835 * if the BIOS did clock slowing or 0 otherwise.
836 */
837
838 static int apm_do_idle(void)
839 {
840 u32 eax;
841 u8 ret = 0;
842 int idled = 0;
843 int err = 0;
844
845 if (!need_resched()) {
846 idled = 1;
847 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
848 }
849
850 if (!idled)
851 return 0;
852
853 if (ret) {
854 static unsigned long t;
855
856 /* This always fails on some SMP boards running UP kernels.
857 * Only report the failure the first 5 times.
858 */
859 if (++t < 5) {
860 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
861 t = jiffies;
862 }
863 return -1;
864 }
865 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
866 return clock_slowed;
867 }
868
869 /**
870 * apm_do_busy - inform the BIOS the CPU is busy
871 *
872 * Request that the BIOS brings the CPU back to full performance.
873 */
874
875 static void apm_do_busy(void)
876 {
877 u32 dummy;
878 int err;
879
880 if (clock_slowed || ALWAYS_CALL_BUSY) {
881 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
882 clock_slowed = 0;
883 }
884 }
885
886 /*
887 * If no process has really been interested in
888 * the CPU for some time, we want to call BIOS
889 * power management - we probably want
890 * to conserve power.
891 */
892 #define IDLE_CALC_LIMIT (HZ * 100)
893 #define IDLE_LEAKY_MAX 16
894
895 /**
896 * apm_cpu_idle - cpu idling for APM capable Linux
897 *
898 * This is the idling function the kernel executes when APM is available. It
899 * tries to do BIOS powermanagement based on the average system idle time.
900 * Furthermore it calls the system default idle routine.
901 */
902
903 static int apm_cpu_idle(struct cpuidle_device *dev,
904 struct cpuidle_driver *drv, int index)
905 {
906 static int use_apm_idle; /* = 0 */
907 static unsigned int last_jiffies; /* = 0 */
908 static unsigned int last_stime; /* = 0 */
909 cputime_t stime;
910
911 int apm_idle_done = 0;
912 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
913 unsigned int bucket;
914
915 recalc:
916 task_cputime(current, NULL, &stime);
917 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
918 use_apm_idle = 0;
919 } else if (jiffies_since_last_check > idle_period) {
920 unsigned int idle_percentage;
921
922 idle_percentage = cputime_to_jiffies(stime - last_stime);
923 idle_percentage *= 100;
924 idle_percentage /= jiffies_since_last_check;
925 use_apm_idle = (idle_percentage > idle_threshold);
926 if (apm_info.forbid_idle)
927 use_apm_idle = 0;
928 }
929
930 last_jiffies = jiffies;
931 last_stime = stime;
932
933 bucket = IDLE_LEAKY_MAX;
934
935 while (!need_resched()) {
936 if (use_apm_idle) {
937 unsigned int t;
938
939 t = jiffies;
940 switch (apm_do_idle()) {
941 case 0:
942 apm_idle_done = 1;
943 if (t != jiffies) {
944 if (bucket) {
945 bucket = IDLE_LEAKY_MAX;
946 continue;
947 }
948 } else if (bucket) {
949 bucket--;
950 continue;
951 }
952 break;
953 case 1:
954 apm_idle_done = 1;
955 break;
956 default: /* BIOS refused */
957 break;
958 }
959 }
960 default_idle();
961 local_irq_disable();
962 jiffies_since_last_check = jiffies - last_jiffies;
963 if (jiffies_since_last_check > idle_period)
964 goto recalc;
965 }
966
967 if (apm_idle_done)
968 apm_do_busy();
969
970 return index;
971 }
972
973 /**
974 * apm_power_off - ask the BIOS to power off
975 *
976 * Handle the power off sequence. This is the one piece of code we
977 * will execute even on SMP machines. In order to deal with BIOS
978 * bugs we support real mode APM BIOS power off calls. We also make
979 * the SMP call on CPU0 as some systems will only honour this call
980 * on their first cpu.
981 */
982
983 static void apm_power_off(void)
984 {
985 /* Some bioses don't like being called from CPU != 0 */
986 if (apm_info.realmode_power_off) {
987 set_cpus_allowed_ptr(current, cpumask_of(0));
988 machine_real_restart(MRR_APM);
989 } else {
990 (void)set_system_power_state(APM_STATE_OFF);
991 }
992 }
993
994 #ifdef CONFIG_APM_DO_ENABLE
995
996 /**
997 * apm_enable_power_management - enable BIOS APM power management
998 * @enable: enable yes/no
999 *
1000 * Enable or disable the APM BIOS power services.
1001 */
1002
1003 static int apm_enable_power_management(int enable)
1004 {
1005 u32 eax;
1006 int err;
1007
1008 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1009 return APM_NOT_ENGAGED;
1010 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1011 enable, &eax, &err))
1012 return err;
1013 if (enable)
1014 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1015 else
1016 apm_info.bios.flags |= APM_BIOS_DISABLED;
1017 return APM_SUCCESS;
1018 }
1019 #endif
1020
1021 /**
1022 * apm_get_power_status - get current power state
1023 * @status: returned status
1024 * @bat: battery info
1025 * @life: estimated life
1026 *
1027 * Obtain the current power status from the APM BIOS. We return a
1028 * status which gives the rough battery status, and current power
1029 * source. The bat value returned give an estimate as a percentage
1030 * of life and a status value for the battery. The estimated life
1031 * if reported is a lifetime in secodnds/minutes at current powwer
1032 * consumption.
1033 */
1034
1035 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1036 {
1037 struct apm_bios_call call;
1038
1039 call.func = APM_FUNC_GET_STATUS;
1040 call.ebx = APM_DEVICE_ALL;
1041 call.ecx = 0;
1042
1043 if (apm_info.get_power_status_broken)
1044 return APM_32_UNSUPPORTED;
1045 if (apm_bios_call(&call))
1046 return call.err;
1047 *status = call.ebx;
1048 *bat = call.ecx;
1049 if (apm_info.get_power_status_swabinminutes) {
1050 *life = swab16((u16)call.edx);
1051 *life |= 0x8000;
1052 } else
1053 *life = call.edx;
1054 return APM_SUCCESS;
1055 }
1056
1057 #if 0
1058 static int apm_get_battery_status(u_short which, u_short *status,
1059 u_short *bat, u_short *life, u_short *nbat)
1060 {
1061 u32 eax;
1062 u32 ebx;
1063 u32 ecx;
1064 u32 edx;
1065 u32 esi;
1066
1067 if (apm_info.connection_version < 0x0102) {
1068 /* pretend we only have one battery. */
1069 if (which != 1)
1070 return APM_BAD_DEVICE;
1071 *nbat = 1;
1072 return apm_get_power_status(status, bat, life);
1073 }
1074
1075 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1076 &ebx, &ecx, &edx, &esi))
1077 return (eax >> 8) & 0xff;
1078 *status = ebx;
1079 *bat = ecx;
1080 *life = edx;
1081 *nbat = esi;
1082 return APM_SUCCESS;
1083 }
1084 #endif
1085
1086 /**
1087 * apm_engage_power_management - enable PM on a device
1088 * @device: identity of device
1089 * @enable: on/off
1090 *
1091 * Activate or deactivate power management on either a specific device
1092 * or the entire system (%APM_DEVICE_ALL).
1093 */
1094
1095 static int apm_engage_power_management(u_short device, int enable)
1096 {
1097 u32 eax;
1098 int err;
1099
1100 if ((enable == 0) && (device == APM_DEVICE_ALL)
1101 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1102 return APM_DISABLED;
1103 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1104 &eax, &err))
1105 return err;
1106 if (device == APM_DEVICE_ALL) {
1107 if (enable)
1108 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1109 else
1110 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1111 }
1112 return APM_SUCCESS;
1113 }
1114
1115 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1116
1117 /**
1118 * apm_console_blank - blank the display
1119 * @blank: on/off
1120 *
1121 * Attempt to blank the console, firstly by blanking just video device
1122 * zero, and if that fails (some BIOSes don't support it) then it blanks
1123 * all video devices. Typically the BIOS will do laptop backlight and
1124 * monitor powerdown for us.
1125 */
1126
1127 static int apm_console_blank(int blank)
1128 {
1129 int error = APM_NOT_ENGAGED; /* silence gcc */
1130 int i;
1131 u_short state;
1132 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1133
1134 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1135
1136 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1137 error = set_power_state(dev[i], state);
1138
1139 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1140 return 1;
1141
1142 if (error == APM_NOT_ENGAGED)
1143 break;
1144 }
1145
1146 if (error == APM_NOT_ENGAGED) {
1147 static int tried;
1148 int eng_error;
1149 if (tried++ == 0) {
1150 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1151 if (eng_error) {
1152 apm_error("set display", error);
1153 apm_error("engage interface", eng_error);
1154 return 0;
1155 } else
1156 return apm_console_blank(blank);
1157 }
1158 }
1159 apm_error("set display", error);
1160 return 0;
1161 }
1162 #endif
1163
1164 static int queue_empty(struct apm_user *as)
1165 {
1166 return as->event_head == as->event_tail;
1167 }
1168
1169 static apm_event_t get_queued_event(struct apm_user *as)
1170 {
1171 if (++as->event_tail >= APM_MAX_EVENTS)
1172 as->event_tail = 0;
1173 return as->events[as->event_tail];
1174 }
1175
1176 static void queue_event(apm_event_t event, struct apm_user *sender)
1177 {
1178 struct apm_user *as;
1179
1180 spin_lock(&user_list_lock);
1181 if (user_list == NULL)
1182 goto out;
1183 for (as = user_list; as != NULL; as = as->next) {
1184 if ((as == sender) || (!as->reader))
1185 continue;
1186 if (++as->event_head >= APM_MAX_EVENTS)
1187 as->event_head = 0;
1188
1189 if (as->event_head == as->event_tail) {
1190 static int notified;
1191
1192 if (notified++ == 0)
1193 pr_err("an event queue overflowed\n");
1194 if (++as->event_tail >= APM_MAX_EVENTS)
1195 as->event_tail = 0;
1196 }
1197 as->events[as->event_head] = event;
1198 if (!as->suser || !as->writer)
1199 continue;
1200 switch (event) {
1201 case APM_SYS_SUSPEND:
1202 case APM_USER_SUSPEND:
1203 as->suspends_pending++;
1204 suspends_pending++;
1205 break;
1206
1207 case APM_SYS_STANDBY:
1208 case APM_USER_STANDBY:
1209 as->standbys_pending++;
1210 standbys_pending++;
1211 break;
1212 }
1213 }
1214 wake_up_interruptible(&apm_waitqueue);
1215 out:
1216 spin_unlock(&user_list_lock);
1217 }
1218
1219 static void reinit_timer(void)
1220 {
1221 #ifdef INIT_TIMER_AFTER_SUSPEND
1222 unsigned long flags;
1223
1224 raw_spin_lock_irqsave(&i8253_lock, flags);
1225 /* set the clock to HZ */
1226 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1227 udelay(10);
1228 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1229 udelay(10);
1230 outb_p(LATCH >> 8, PIT_CH0); /* MSB */
1231 udelay(10);
1232 raw_spin_unlock_irqrestore(&i8253_lock, flags);
1233 #endif
1234 }
1235
1236 static int suspend(int vetoable)
1237 {
1238 int err;
1239 struct apm_user *as;
1240
1241 dpm_suspend_start(PMSG_SUSPEND);
1242 dpm_suspend_end(PMSG_SUSPEND);
1243
1244 local_irq_disable();
1245 syscore_suspend();
1246
1247 local_irq_enable();
1248
1249 save_processor_state();
1250 err = set_system_power_state(APM_STATE_SUSPEND);
1251 ignore_normal_resume = 1;
1252 restore_processor_state();
1253
1254 local_irq_disable();
1255 reinit_timer();
1256
1257 if (err == APM_NO_ERROR)
1258 err = APM_SUCCESS;
1259 if (err != APM_SUCCESS)
1260 apm_error("suspend", err);
1261 err = (err == APM_SUCCESS) ? 0 : -EIO;
1262
1263 syscore_resume();
1264 local_irq_enable();
1265
1266 dpm_resume_start(PMSG_RESUME);
1267 dpm_resume_end(PMSG_RESUME);
1268
1269 queue_event(APM_NORMAL_RESUME, NULL);
1270 spin_lock(&user_list_lock);
1271 for (as = user_list; as != NULL; as = as->next) {
1272 as->suspend_wait = 0;
1273 as->suspend_result = err;
1274 }
1275 spin_unlock(&user_list_lock);
1276 wake_up_interruptible(&apm_suspend_waitqueue);
1277 return err;
1278 }
1279
1280 static void standby(void)
1281 {
1282 int err;
1283
1284 dpm_suspend_end(PMSG_SUSPEND);
1285
1286 local_irq_disable();
1287 syscore_suspend();
1288 local_irq_enable();
1289
1290 err = set_system_power_state(APM_STATE_STANDBY);
1291 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1292 apm_error("standby", err);
1293
1294 local_irq_disable();
1295 syscore_resume();
1296 local_irq_enable();
1297
1298 dpm_resume_start(PMSG_RESUME);
1299 }
1300
1301 static apm_event_t get_event(void)
1302 {
1303 int error;
1304 apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1305 apm_eventinfo_t info;
1306
1307 static int notified;
1308
1309 /* we don't use the eventinfo */
1310 error = apm_get_event(&event, &info);
1311 if (error == APM_SUCCESS)
1312 return event;
1313
1314 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1315 apm_error("get_event", error);
1316
1317 return 0;
1318 }
1319
1320 static void check_events(void)
1321 {
1322 apm_event_t event;
1323 static unsigned long last_resume;
1324 static int ignore_bounce;
1325
1326 while ((event = get_event()) != 0) {
1327 if (debug) {
1328 if (event <= NR_APM_EVENT_NAME)
1329 printk(KERN_DEBUG "apm: received %s notify\n",
1330 apm_event_name[event - 1]);
1331 else
1332 printk(KERN_DEBUG "apm: received unknown "
1333 "event 0x%02x\n", event);
1334 }
1335 if (ignore_bounce
1336 && (time_after(jiffies, last_resume + bounce_interval)))
1337 ignore_bounce = 0;
1338
1339 switch (event) {
1340 case APM_SYS_STANDBY:
1341 case APM_USER_STANDBY:
1342 queue_event(event, NULL);
1343 if (standbys_pending <= 0)
1344 standby();
1345 break;
1346
1347 case APM_USER_SUSPEND:
1348 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1349 if (apm_info.connection_version > 0x100)
1350 set_system_power_state(APM_STATE_REJECT);
1351 break;
1352 #endif
1353 case APM_SYS_SUSPEND:
1354 if (ignore_bounce) {
1355 if (apm_info.connection_version > 0x100)
1356 set_system_power_state(APM_STATE_REJECT);
1357 break;
1358 }
1359 /*
1360 * If we are already processing a SUSPEND,
1361 * then further SUSPEND events from the BIOS
1362 * will be ignored. We also return here to
1363 * cope with the fact that the Thinkpads keep
1364 * sending a SUSPEND event until something else
1365 * happens!
1366 */
1367 if (ignore_sys_suspend)
1368 return;
1369 ignore_sys_suspend = 1;
1370 queue_event(event, NULL);
1371 if (suspends_pending <= 0)
1372 (void) suspend(1);
1373 break;
1374
1375 case APM_NORMAL_RESUME:
1376 case APM_CRITICAL_RESUME:
1377 case APM_STANDBY_RESUME:
1378 ignore_sys_suspend = 0;
1379 last_resume = jiffies;
1380 ignore_bounce = 1;
1381 if ((event != APM_NORMAL_RESUME)
1382 || (ignore_normal_resume == 0)) {
1383 dpm_resume_end(PMSG_RESUME);
1384 queue_event(event, NULL);
1385 }
1386 ignore_normal_resume = 0;
1387 break;
1388
1389 case APM_CAPABILITY_CHANGE:
1390 case APM_LOW_BATTERY:
1391 case APM_POWER_STATUS_CHANGE:
1392 queue_event(event, NULL);
1393 /* If needed, notify drivers here */
1394 break;
1395
1396 case APM_UPDATE_TIME:
1397 break;
1398
1399 case APM_CRITICAL_SUSPEND:
1400 /*
1401 * We are not allowed to reject a critical suspend.
1402 */
1403 (void)suspend(0);
1404 break;
1405 }
1406 }
1407 }
1408
1409 static void apm_event_handler(void)
1410 {
1411 static int pending_count = 4;
1412 int err;
1413
1414 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1415 if ((apm_info.connection_version > 0x100) &&
1416 (pending_count-- <= 0)) {
1417 pending_count = 4;
1418 if (debug)
1419 printk(KERN_DEBUG "apm: setting state busy\n");
1420 err = set_system_power_state(APM_STATE_BUSY);
1421 if (err)
1422 apm_error("busy", err);
1423 }
1424 } else
1425 pending_count = 4;
1426 check_events();
1427 }
1428
1429 /*
1430 * This is the APM thread main loop.
1431 */
1432
1433 static void apm_mainloop(void)
1434 {
1435 DECLARE_WAITQUEUE(wait, current);
1436
1437 add_wait_queue(&apm_waitqueue, &wait);
1438 set_current_state(TASK_INTERRUPTIBLE);
1439 for (;;) {
1440 schedule_timeout(APM_CHECK_TIMEOUT);
1441 if (kthread_should_stop())
1442 break;
1443 /*
1444 * Ok, check all events, check for idle (and mark us sleeping
1445 * so as not to count towards the load average)..
1446 */
1447 set_current_state(TASK_INTERRUPTIBLE);
1448 apm_event_handler();
1449 }
1450 remove_wait_queue(&apm_waitqueue, &wait);
1451 }
1452
1453 static int check_apm_user(struct apm_user *as, const char *func)
1454 {
1455 if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1456 pr_err("%s passed bad filp\n", func);
1457 return 1;
1458 }
1459 return 0;
1460 }
1461
1462 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1463 {
1464 struct apm_user *as;
1465 int i;
1466 apm_event_t event;
1467
1468 as = fp->private_data;
1469 if (check_apm_user(as, "read"))
1470 return -EIO;
1471 if ((int)count < sizeof(apm_event_t))
1472 return -EINVAL;
1473 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1474 return -EAGAIN;
1475 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1476 i = count;
1477 while ((i >= sizeof(event)) && !queue_empty(as)) {
1478 event = get_queued_event(as);
1479 if (copy_to_user(buf, &event, sizeof(event))) {
1480 if (i < count)
1481 break;
1482 return -EFAULT;
1483 }
1484 switch (event) {
1485 case APM_SYS_SUSPEND:
1486 case APM_USER_SUSPEND:
1487 as->suspends_read++;
1488 break;
1489
1490 case APM_SYS_STANDBY:
1491 case APM_USER_STANDBY:
1492 as->standbys_read++;
1493 break;
1494 }
1495 buf += sizeof(event);
1496 i -= sizeof(event);
1497 }
1498 if (i < count)
1499 return count - i;
1500 if (signal_pending(current))
1501 return -ERESTARTSYS;
1502 return 0;
1503 }
1504
1505 static unsigned int do_poll(struct file *fp, poll_table *wait)
1506 {
1507 struct apm_user *as;
1508
1509 as = fp->private_data;
1510 if (check_apm_user(as, "poll"))
1511 return 0;
1512 poll_wait(fp, &apm_waitqueue, wait);
1513 if (!queue_empty(as))
1514 return POLLIN | POLLRDNORM;
1515 return 0;
1516 }
1517
1518 static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1519 {
1520 struct apm_user *as;
1521 int ret;
1522
1523 as = filp->private_data;
1524 if (check_apm_user(as, "ioctl"))
1525 return -EIO;
1526 if (!as->suser || !as->writer)
1527 return -EPERM;
1528 switch (cmd) {
1529 case APM_IOC_STANDBY:
1530 mutex_lock(&apm_mutex);
1531 if (as->standbys_read > 0) {
1532 as->standbys_read--;
1533 as->standbys_pending--;
1534 standbys_pending--;
1535 } else
1536 queue_event(APM_USER_STANDBY, as);
1537 if (standbys_pending <= 0)
1538 standby();
1539 mutex_unlock(&apm_mutex);
1540 break;
1541 case APM_IOC_SUSPEND:
1542 mutex_lock(&apm_mutex);
1543 if (as->suspends_read > 0) {
1544 as->suspends_read--;
1545 as->suspends_pending--;
1546 suspends_pending--;
1547 } else
1548 queue_event(APM_USER_SUSPEND, as);
1549 if (suspends_pending <= 0) {
1550 ret = suspend(1);
1551 mutex_unlock(&apm_mutex);
1552 } else {
1553 as->suspend_wait = 1;
1554 mutex_unlock(&apm_mutex);
1555 wait_event_interruptible(apm_suspend_waitqueue,
1556 as->suspend_wait == 0);
1557 ret = as->suspend_result;
1558 }
1559 return ret;
1560 default:
1561 return -ENOTTY;
1562 }
1563 return 0;
1564 }
1565
1566 static int do_release(struct inode *inode, struct file *filp)
1567 {
1568 struct apm_user *as;
1569
1570 as = filp->private_data;
1571 if (check_apm_user(as, "release"))
1572 return 0;
1573 filp->private_data = NULL;
1574 if (as->standbys_pending > 0) {
1575 standbys_pending -= as->standbys_pending;
1576 if (standbys_pending <= 0)
1577 standby();
1578 }
1579 if (as->suspends_pending > 0) {
1580 suspends_pending -= as->suspends_pending;
1581 if (suspends_pending <= 0)
1582 (void) suspend(1);
1583 }
1584 spin_lock(&user_list_lock);
1585 if (user_list == as)
1586 user_list = as->next;
1587 else {
1588 struct apm_user *as1;
1589
1590 for (as1 = user_list;
1591 (as1 != NULL) && (as1->next != as);
1592 as1 = as1->next)
1593 ;
1594 if (as1 == NULL)
1595 pr_err("filp not in user list\n");
1596 else
1597 as1->next = as->next;
1598 }
1599 spin_unlock(&user_list_lock);
1600 kfree(as);
1601 return 0;
1602 }
1603
1604 static int do_open(struct inode *inode, struct file *filp)
1605 {
1606 struct apm_user *as;
1607
1608 as = kmalloc(sizeof(*as), GFP_KERNEL);
1609 if (as == NULL)
1610 return -ENOMEM;
1611
1612 as->magic = APM_BIOS_MAGIC;
1613 as->event_tail = as->event_head = 0;
1614 as->suspends_pending = as->standbys_pending = 0;
1615 as->suspends_read = as->standbys_read = 0;
1616 /*
1617 * XXX - this is a tiny bit broken, when we consider BSD
1618 * process accounting. If the device is opened by root, we
1619 * instantly flag that we used superuser privs. Who knows,
1620 * we might close the device immediately without doing a
1621 * privileged operation -- cevans
1622 */
1623 as->suser = capable(CAP_SYS_ADMIN);
1624 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1625 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1626 spin_lock(&user_list_lock);
1627 as->next = user_list;
1628 user_list = as;
1629 spin_unlock(&user_list_lock);
1630 filp->private_data = as;
1631 return 0;
1632 }
1633
1634 static int proc_apm_show(struct seq_file *m, void *v)
1635 {
1636 unsigned short bx;
1637 unsigned short cx;
1638 unsigned short dx;
1639 int error;
1640 unsigned short ac_line_status = 0xff;
1641 unsigned short battery_status = 0xff;
1642 unsigned short battery_flag = 0xff;
1643 int percentage = -1;
1644 int time_units = -1;
1645 char *units = "?";
1646
1647 if ((num_online_cpus() == 1) &&
1648 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1649 ac_line_status = (bx >> 8) & 0xff;
1650 battery_status = bx & 0xff;
1651 if ((cx & 0xff) != 0xff)
1652 percentage = cx & 0xff;
1653
1654 if (apm_info.connection_version > 0x100) {
1655 battery_flag = (cx >> 8) & 0xff;
1656 if (dx != 0xffff) {
1657 units = (dx & 0x8000) ? "min" : "sec";
1658 time_units = dx & 0x7fff;
1659 }
1660 }
1661 }
1662 /* Arguments, with symbols from linux/apm_bios.h. Information is
1663 from the Get Power Status (0x0a) call unless otherwise noted.
1664
1665 0) Linux driver version (this will change if format changes)
1666 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1667 2) APM flags from APM Installation Check (0x00):
1668 bit 0: APM_16_BIT_SUPPORT
1669 bit 1: APM_32_BIT_SUPPORT
1670 bit 2: APM_IDLE_SLOWS_CLOCK
1671 bit 3: APM_BIOS_DISABLED
1672 bit 4: APM_BIOS_DISENGAGED
1673 3) AC line status
1674 0x00: Off-line
1675 0x01: On-line
1676 0x02: On backup power (BIOS >= 1.1 only)
1677 0xff: Unknown
1678 4) Battery status
1679 0x00: High
1680 0x01: Low
1681 0x02: Critical
1682 0x03: Charging
1683 0x04: Selected battery not present (BIOS >= 1.2 only)
1684 0xff: Unknown
1685 5) Battery flag
1686 bit 0: High
1687 bit 1: Low
1688 bit 2: Critical
1689 bit 3: Charging
1690 bit 7: No system battery
1691 0xff: Unknown
1692 6) Remaining battery life (percentage of charge):
1693 0-100: valid
1694 -1: Unknown
1695 7) Remaining battery life (time units):
1696 Number of remaining minutes or seconds
1697 -1: Unknown
1698 8) min = minutes; sec = seconds */
1699
1700 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1701 driver_version,
1702 (apm_info.bios.version >> 8) & 0xff,
1703 apm_info.bios.version & 0xff,
1704 apm_info.bios.flags,
1705 ac_line_status,
1706 battery_status,
1707 battery_flag,
1708 percentage,
1709 time_units,
1710 units);
1711 return 0;
1712 }
1713
1714 static int proc_apm_open(struct inode *inode, struct file *file)
1715 {
1716 return single_open(file, proc_apm_show, NULL);
1717 }
1718
1719 static const struct file_operations apm_file_ops = {
1720 .owner = THIS_MODULE,
1721 .open = proc_apm_open,
1722 .read = seq_read,
1723 .llseek = seq_lseek,
1724 .release = single_release,
1725 };
1726
1727 static int apm(void *unused)
1728 {
1729 unsigned short bx;
1730 unsigned short cx;
1731 unsigned short dx;
1732 int error;
1733 char *power_stat;
1734 char *bat_stat;
1735
1736 /* 2002/08/01 - WT
1737 * This is to avoid random crashes at boot time during initialization
1738 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1739 * Some bioses don't like being called from CPU != 0.
1740 * Method suggested by Ingo Molnar.
1741 */
1742 set_cpus_allowed_ptr(current, cpumask_of(0));
1743 BUG_ON(smp_processor_id() != 0);
1744
1745 if (apm_info.connection_version == 0) {
1746 apm_info.connection_version = apm_info.bios.version;
1747 if (apm_info.connection_version > 0x100) {
1748 /*
1749 * We only support BIOSs up to version 1.2
1750 */
1751 if (apm_info.connection_version > 0x0102)
1752 apm_info.connection_version = 0x0102;
1753 error = apm_driver_version(&apm_info.connection_version);
1754 if (error != APM_SUCCESS) {
1755 apm_error("driver version", error);
1756 /* Fall back to an APM 1.0 connection. */
1757 apm_info.connection_version = 0x100;
1758 }
1759 }
1760 }
1761
1762 if (debug)
1763 printk(KERN_INFO "apm: Connection version %d.%d\n",
1764 (apm_info.connection_version >> 8) & 0xff,
1765 apm_info.connection_version & 0xff);
1766
1767 #ifdef CONFIG_APM_DO_ENABLE
1768 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1769 /*
1770 * This call causes my NEC UltraLite Versa 33/C to hang if it
1771 * is booted with PM disabled but not in the docking station.
1772 * Unfortunate ...
1773 */
1774 error = apm_enable_power_management(1);
1775 if (error) {
1776 apm_error("enable power management", error);
1777 return -1;
1778 }
1779 }
1780 #endif
1781
1782 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1783 && (apm_info.connection_version > 0x0100)) {
1784 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1785 if (error) {
1786 apm_error("engage power management", error);
1787 return -1;
1788 }
1789 }
1790
1791 if (debug && (num_online_cpus() == 1 || smp)) {
1792 error = apm_get_power_status(&bx, &cx, &dx);
1793 if (error)
1794 printk(KERN_INFO "apm: power status not available\n");
1795 else {
1796 switch ((bx >> 8) & 0xff) {
1797 case 0:
1798 power_stat = "off line";
1799 break;
1800 case 1:
1801 power_stat = "on line";
1802 break;
1803 case 2:
1804 power_stat = "on backup power";
1805 break;
1806 default:
1807 power_stat = "unknown";
1808 break;
1809 }
1810 switch (bx & 0xff) {
1811 case 0:
1812 bat_stat = "high";
1813 break;
1814 case 1:
1815 bat_stat = "low";
1816 break;
1817 case 2:
1818 bat_stat = "critical";
1819 break;
1820 case 3:
1821 bat_stat = "charging";
1822 break;
1823 default:
1824 bat_stat = "unknown";
1825 break;
1826 }
1827 printk(KERN_INFO
1828 "apm: AC %s, battery status %s, battery life ",
1829 power_stat, bat_stat);
1830 if ((cx & 0xff) == 0xff)
1831 printk("unknown\n");
1832 else
1833 printk("%d%%\n", cx & 0xff);
1834 if (apm_info.connection_version > 0x100) {
1835 printk(KERN_INFO
1836 "apm: battery flag 0x%02x, battery life ",
1837 (cx >> 8) & 0xff);
1838 if (dx == 0xffff)
1839 printk("unknown\n");
1840 else
1841 printk("%d %s\n", dx & 0x7fff,
1842 (dx & 0x8000) ?
1843 "minutes" : "seconds");
1844 }
1845 }
1846 }
1847
1848 /* Install our power off handler.. */
1849 if (power_off)
1850 pm_power_off = apm_power_off;
1851
1852 if (num_online_cpus() == 1 || smp) {
1853 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1854 console_blank_hook = apm_console_blank;
1855 #endif
1856 apm_mainloop();
1857 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1858 console_blank_hook = NULL;
1859 #endif
1860 }
1861
1862 return 0;
1863 }
1864
1865 #ifndef MODULE
1866 static int __init apm_setup(char *str)
1867 {
1868 int invert;
1869
1870 while ((str != NULL) && (*str != '\0')) {
1871 if (strncmp(str, "off", 3) == 0)
1872 apm_disabled = 1;
1873 if (strncmp(str, "on", 2) == 0)
1874 apm_disabled = 0;
1875 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1876 (strncmp(str, "bounce_interval=", 16) == 0))
1877 bounce_interval = simple_strtol(str + 16, NULL, 0);
1878 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1879 (strncmp(str, "idle_threshold=", 15) == 0))
1880 idle_threshold = simple_strtol(str + 15, NULL, 0);
1881 if ((strncmp(str, "idle-period=", 12) == 0) ||
1882 (strncmp(str, "idle_period=", 12) == 0))
1883 idle_period = simple_strtol(str + 12, NULL, 0);
1884 invert = (strncmp(str, "no-", 3) == 0) ||
1885 (strncmp(str, "no_", 3) == 0);
1886 if (invert)
1887 str += 3;
1888 if (strncmp(str, "debug", 5) == 0)
1889 debug = !invert;
1890 if ((strncmp(str, "power-off", 9) == 0) ||
1891 (strncmp(str, "power_off", 9) == 0))
1892 power_off = !invert;
1893 if (strncmp(str, "smp", 3) == 0) {
1894 smp = !invert;
1895 idle_threshold = 100;
1896 }
1897 if ((strncmp(str, "allow-ints", 10) == 0) ||
1898 (strncmp(str, "allow_ints", 10) == 0))
1899 apm_info.allow_ints = !invert;
1900 if ((strncmp(str, "broken-psr", 10) == 0) ||
1901 (strncmp(str, "broken_psr", 10) == 0))
1902 apm_info.get_power_status_broken = !invert;
1903 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1904 (strncmp(str, "realmode_power_off", 18) == 0))
1905 apm_info.realmode_power_off = !invert;
1906 str = strchr(str, ',');
1907 if (str != NULL)
1908 str += strspn(str, ", \t");
1909 }
1910 return 1;
1911 }
1912
1913 __setup("apm=", apm_setup);
1914 #endif
1915
1916 static const struct file_operations apm_bios_fops = {
1917 .owner = THIS_MODULE,
1918 .read = do_read,
1919 .poll = do_poll,
1920 .unlocked_ioctl = do_ioctl,
1921 .open = do_open,
1922 .release = do_release,
1923 .llseek = noop_llseek,
1924 };
1925
1926 static struct miscdevice apm_device = {
1927 APM_MINOR_DEV,
1928 "apm_bios",
1929 &apm_bios_fops
1930 };
1931
1932
1933 /* Simple "print if true" callback */
1934 static int __init print_if_true(const struct dmi_system_id *d)
1935 {
1936 printk("%s\n", d->ident);
1937 return 0;
1938 }
1939
1940 /*
1941 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1942 * disabled before the suspend. Linux used to get terribly confused by that.
1943 */
1944 static int __init broken_ps2_resume(const struct dmi_system_id *d)
1945 {
1946 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1947 "workaround hopefully not needed.\n", d->ident);
1948 return 0;
1949 }
1950
1951 /* Some bioses have a broken protected mode poweroff and need to use realmode */
1952 static int __init set_realmode_power_off(const struct dmi_system_id *d)
1953 {
1954 if (apm_info.realmode_power_off == 0) {
1955 apm_info.realmode_power_off = 1;
1956 printk(KERN_INFO "%s bios detected. "
1957 "Using realmode poweroff only.\n", d->ident);
1958 }
1959 return 0;
1960 }
1961
1962 /* Some laptops require interrupts to be enabled during APM calls */
1963 static int __init set_apm_ints(const struct dmi_system_id *d)
1964 {
1965 if (apm_info.allow_ints == 0) {
1966 apm_info.allow_ints = 1;
1967 printk(KERN_INFO "%s machine detected. "
1968 "Enabling interrupts during APM calls.\n", d->ident);
1969 }
1970 return 0;
1971 }
1972
1973 /* Some APM bioses corrupt memory or just plain do not work */
1974 static int __init apm_is_horked(const struct dmi_system_id *d)
1975 {
1976 if (apm_info.disabled == 0) {
1977 apm_info.disabled = 1;
1978 printk(KERN_INFO "%s machine detected. "
1979 "Disabling APM.\n", d->ident);
1980 }
1981 return 0;
1982 }
1983
1984 static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1985 {
1986 if (apm_info.disabled == 0) {
1987 apm_info.disabled = 1;
1988 printk(KERN_INFO "%s machine detected. "
1989 "Disabling APM.\n", d->ident);
1990 printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
1991 printk(KERN_INFO "download from support.intel.com\n");
1992 }
1993 return 0;
1994 }
1995
1996 /* Some APM bioses hang on APM idle calls */
1997 static int __init apm_likes_to_melt(const struct dmi_system_id *d)
1998 {
1999 if (apm_info.forbid_idle == 0) {
2000 apm_info.forbid_idle = 1;
2001 printk(KERN_INFO "%s machine detected. "
2002 "Disabling APM idle calls.\n", d->ident);
2003 }
2004 return 0;
2005 }
2006
2007 /*
2008 * Check for clue free BIOS implementations who use
2009 * the following QA technique
2010 *
2011 * [ Write BIOS Code ]<------
2012 * | ^
2013 * < Does it Compile >----N--
2014 * |Y ^
2015 * < Does it Boot Win98 >-N--
2016 * |Y
2017 * [Ship It]
2018 *
2019 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
2020 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
2021 */
2022 static int __init broken_apm_power(const struct dmi_system_id *d)
2023 {
2024 apm_info.get_power_status_broken = 1;
2025 printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2026 "disabling power status reporting.\n");
2027 return 0;
2028 }
2029
2030 /*
2031 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2032 * have this problem).
2033 */
2034 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2035 {
2036 apm_info.get_power_status_swabinminutes = 1;
2037 printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2038 "in minutes and wrong byte order.\n");
2039 return 0;
2040 }
2041
2042 static struct dmi_system_id __initdata apm_dmi_table[] = {
2043 {
2044 print_if_true,
2045 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2046 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2047 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2048 },
2049 { /* Handle problems with APM on the C600 */
2050 broken_ps2_resume, "Dell Latitude C600",
2051 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2052 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2053 },
2054 { /* Allow interrupts during suspend on Dell Latitude laptops*/
2055 set_apm_ints, "Dell Latitude",
2056 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2057 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2058 },
2059 { /* APM crashes */
2060 apm_is_horked, "Dell Inspiron 2500",
2061 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2062 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2063 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2064 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2065 },
2066 { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2067 set_apm_ints, "Dell Inspiron", {
2068 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2069 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2070 },
2071 { /* Handle problems with APM on Inspiron 5000e */
2072 broken_apm_power, "Dell Inspiron 5000e",
2073 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2074 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2075 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2076 },
2077 { /* Handle problems with APM on Inspiron 2500 */
2078 broken_apm_power, "Dell Inspiron 2500",
2079 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2080 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2081 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2082 },
2083 { /* APM crashes */
2084 apm_is_horked, "Dell Dimension 4100",
2085 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2086 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2087 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2088 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2089 },
2090 { /* Allow interrupts during suspend on Compaq Laptops*/
2091 set_apm_ints, "Compaq 12XL125",
2092 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2093 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2094 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2095 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2096 },
2097 { /* Allow interrupts during APM or the clock goes slow */
2098 set_apm_ints, "ASUSTeK",
2099 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2100 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2101 },
2102 { /* APM blows on shutdown */
2103 apm_is_horked, "ABIT KX7-333[R]",
2104 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2105 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2106 },
2107 { /* APM crashes */
2108 apm_is_horked, "Trigem Delhi3",
2109 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2110 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2111 },
2112 { /* APM crashes */
2113 apm_is_horked, "Fujitsu-Siemens",
2114 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2115 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2116 },
2117 { /* APM crashes */
2118 apm_is_horked_d850md, "Intel D850MD",
2119 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2120 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2121 },
2122 { /* APM crashes */
2123 apm_is_horked, "Intel D810EMO",
2124 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2125 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2126 },
2127 { /* APM crashes */
2128 apm_is_horked, "Dell XPS-Z",
2129 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2130 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2131 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2132 },
2133 { /* APM crashes */
2134 apm_is_horked, "Sharp PC-PJ/AX",
2135 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2136 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2137 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2138 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2139 },
2140 { /* APM crashes */
2141 apm_is_horked, "Dell Inspiron 2500",
2142 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2143 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2144 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2145 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2146 },
2147 { /* APM idle hangs */
2148 apm_likes_to_melt, "Jabil AMD",
2149 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2150 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2151 },
2152 { /* APM idle hangs */
2153 apm_likes_to_melt, "AMI Bios",
2154 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2155 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2156 },
2157 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2158 swab_apm_power_in_minutes, "Sony VAIO",
2159 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2160 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2161 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2162 },
2163 { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2164 swab_apm_power_in_minutes, "Sony VAIO",
2165 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2166 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2167 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2168 },
2169 { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2170 swab_apm_power_in_minutes, "Sony VAIO",
2171 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2172 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2173 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2174 },
2175 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2176 swab_apm_power_in_minutes, "Sony VAIO",
2177 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2178 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2179 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2180 },
2181 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2182 swab_apm_power_in_minutes, "Sony VAIO",
2183 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2184 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2185 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2186 },
2187 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2188 swab_apm_power_in_minutes, "Sony VAIO",
2189 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2190 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2191 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2192 },
2193 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2194 swab_apm_power_in_minutes, "Sony VAIO",
2195 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2196 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2197 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2198 },
2199 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2200 swab_apm_power_in_minutes, "Sony VAIO",
2201 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2202 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2203 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2204 },
2205 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2206 swab_apm_power_in_minutes, "Sony VAIO",
2207 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2208 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2209 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2210 },
2211 { /* Handle problems with APM on Sony Vaio PCG-F104K */
2212 swab_apm_power_in_minutes, "Sony VAIO",
2213 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2214 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2215 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2216 },
2217
2218 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2219 swab_apm_power_in_minutes, "Sony VAIO",
2220 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2221 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2222 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2223 },
2224 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2225 swab_apm_power_in_minutes, "Sony VAIO",
2226 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2227 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2228 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2229 },
2230 { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2231 swab_apm_power_in_minutes, "Sony VAIO",
2232 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2233 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2234 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2235 },
2236 { /* broken PM poweroff bios */
2237 set_realmode_power_off, "Award Software v4.60 PGMA",
2238 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2239 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2240 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2241 },
2242
2243 /* Generic per vendor APM settings */
2244
2245 { /* Allow interrupts during suspend on IBM laptops */
2246 set_apm_ints, "IBM",
2247 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2248 },
2249
2250 { }
2251 };
2252
2253 /*
2254 * Just start the APM thread. We do NOT want to do APM BIOS
2255 * calls from anything but the APM thread, if for no other reason
2256 * than the fact that we don't trust the APM BIOS. This way,
2257 * most common APM BIOS problems that lead to protection errors
2258 * etc will have at least some level of being contained...
2259 *
2260 * In short, if something bad happens, at least we have a choice
2261 * of just killing the apm thread..
2262 */
2263 static int __init apm_init(void)
2264 {
2265 struct desc_struct *gdt;
2266 int err;
2267
2268 dmi_check_system(apm_dmi_table);
2269
2270 if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) {
2271 printk(KERN_INFO "apm: BIOS not found.\n");
2272 return -ENODEV;
2273 }
2274 printk(KERN_INFO
2275 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2276 ((apm_info.bios.version >> 8) & 0xff),
2277 (apm_info.bios.version & 0xff),
2278 apm_info.bios.flags,
2279 driver_version);
2280 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2281 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2282 return -ENODEV;
2283 }
2284
2285 if (allow_ints)
2286 apm_info.allow_ints = 1;
2287 if (broken_psr)
2288 apm_info.get_power_status_broken = 1;
2289 if (realmode_power_off)
2290 apm_info.realmode_power_off = 1;
2291 /* User can override, but default is to trust DMI */
2292 if (apm_disabled != -1)
2293 apm_info.disabled = apm_disabled;
2294
2295 /*
2296 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2297 * but is reportedly a 1.0 BIOS.
2298 */
2299 if (apm_info.bios.version == 0x001)
2300 apm_info.bios.version = 0x100;
2301
2302 /* BIOS < 1.2 doesn't set cseg_16_len */
2303 if (apm_info.bios.version < 0x102)
2304 apm_info.bios.cseg_16_len = 0; /* 64k */
2305
2306 if (debug) {
2307 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2308 apm_info.bios.cseg, apm_info.bios.offset,
2309 apm_info.bios.cseg_16, apm_info.bios.dseg);
2310 if (apm_info.bios.version > 0x100)
2311 printk(" cseg len %x, dseg len %x",
2312 apm_info.bios.cseg_len,
2313 apm_info.bios.dseg_len);
2314 if (apm_info.bios.version > 0x101)
2315 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2316 printk("\n");
2317 }
2318
2319 if (apm_info.disabled) {
2320 pr_notice("disabled on user request.\n");
2321 return -ENODEV;
2322 }
2323 if ((num_online_cpus() > 1) && !power_off && !smp) {
2324 pr_notice("disabled - APM is not SMP safe.\n");
2325 apm_info.disabled = 1;
2326 return -ENODEV;
2327 }
2328 if (!acpi_disabled) {
2329 pr_notice("overridden by ACPI.\n");
2330 apm_info.disabled = 1;
2331 return -ENODEV;
2332 }
2333
2334 /*
2335 * Set up the long jump entry point to the APM BIOS, which is called
2336 * from inline assembly.
2337 */
2338 apm_bios_entry.offset = apm_info.bios.offset;
2339 apm_bios_entry.segment = APM_CS;
2340
2341 /*
2342 * The APM 1.1 BIOS is supposed to provide limit information that it
2343 * recognizes. Many machines do this correctly, but many others do
2344 * not restrict themselves to their claimed limit. When this happens,
2345 * they will cause a segmentation violation in the kernel at boot time.
2346 * Most BIOS's, however, will respect a 64k limit, so we use that.
2347 *
2348 * Note we only set APM segments on CPU zero, since we pin the APM
2349 * code to that CPU.
2350 */
2351 gdt = get_cpu_gdt_table(0);
2352 set_desc_base(&gdt[APM_CS >> 3],
2353 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2354 set_desc_base(&gdt[APM_CS_16 >> 3],
2355 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2356 set_desc_base(&gdt[APM_DS >> 3],
2357 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2358
2359 proc_create("apm", 0, NULL, &apm_file_ops);
2360
2361 kapmd_task = kthread_create(apm, NULL, "kapmd");
2362 if (IS_ERR(kapmd_task)) {
2363 pr_err("disabled - Unable to start kernel thread\n");
2364 err = PTR_ERR(kapmd_task);
2365 kapmd_task = NULL;
2366 remove_proc_entry("apm", NULL);
2367 return err;
2368 }
2369 wake_up_process(kapmd_task);
2370
2371 if (num_online_cpus() > 1 && !smp) {
2372 printk(KERN_NOTICE
2373 "apm: disabled - APM is not SMP safe (power off active).\n");
2374 return 0;
2375 }
2376
2377 /*
2378 * Note we don't actually care if the misc_device cannot be registered.
2379 * this driver can do its job without it, even if userspace can't
2380 * control it. just log the error
2381 */
2382 if (misc_register(&apm_device))
2383 printk(KERN_WARNING "apm: Could not register misc device.\n");
2384
2385 if (HZ != 100)
2386 idle_period = (idle_period * HZ) / 100;
2387 if (idle_threshold < 100) {
2388 if (!cpuidle_register_driver(&apm_idle_driver))
2389 if (cpuidle_register_device(&apm_cpuidle_device))
2390 cpuidle_unregister_driver(&apm_idle_driver);
2391 }
2392
2393 return 0;
2394 }
2395
2396 static void __exit apm_exit(void)
2397 {
2398 int error;
2399
2400 cpuidle_unregister_device(&apm_cpuidle_device);
2401 cpuidle_unregister_driver(&apm_idle_driver);
2402
2403 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2404 && (apm_info.connection_version > 0x0100)) {
2405 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2406 if (error)
2407 apm_error("disengage power management", error);
2408 }
2409 misc_deregister(&apm_device);
2410 remove_proc_entry("apm", NULL);
2411 if (power_off)
2412 pm_power_off = NULL;
2413 if (kapmd_task) {
2414 kthread_stop(kapmd_task);
2415 kapmd_task = NULL;
2416 }
2417 }
2418
2419 module_init(apm_init);
2420 module_exit(apm_exit);
2421
2422 MODULE_AUTHOR("Stephen Rothwell");
2423 MODULE_DESCRIPTION("Advanced Power Management");
2424 MODULE_LICENSE("GPL");
2425 module_param(debug, bool, 0644);
2426 MODULE_PARM_DESC(debug, "Enable debug mode");
2427 module_param(power_off, bool, 0444);
2428 MODULE_PARM_DESC(power_off, "Enable power off");
2429 module_param(bounce_interval, int, 0444);
2430 MODULE_PARM_DESC(bounce_interval,
2431 "Set the number of ticks to ignore suspend bounces");
2432 module_param(allow_ints, bool, 0444);
2433 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2434 module_param(broken_psr, bool, 0444);
2435 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2436 module_param(realmode_power_off, bool, 0444);
2437 MODULE_PARM_DESC(realmode_power_off,
2438 "Switch to real mode before powering off");
2439 module_param(idle_threshold, int, 0444);
2440 MODULE_PARM_DESC(idle_threshold,
2441 "System idle percentage above which to make APM BIOS idle calls");
2442 module_param(idle_period, int, 0444);
2443 MODULE_PARM_DESC(idle_period,
2444 "Period (in sec/100) over which to caculate the idle percentage");
2445 module_param(smp, bool, 0444);
2446 MODULE_PARM_DESC(smp,
2447 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2448 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
Linux with added FPC-III support