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