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apm_32.c
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1 /* -*- linux-c -*-
2  * APM BIOS driver for Linux
3  * Copyright 1994-2001 Stephen Rothwell ([email protected])
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 ([email protected]):
19  * Minor enhancements and updates (to the patch set) for 1.3.x
20  * Documentation
21  * January 1996, Rik Faith ([email protected]):
22  * Make /proc/apm easy to format (bump driver version)
23  * March 1996, Rik Faith ([email protected]):
24  * Prohibit APM BIOS calls unless apm_enabled.
25  * (Thanks to Ulrich Windl <[email protected]>)
26  * April 1996, Stephen Rothwell ([email protected])
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  * <[email protected]>); 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 <[email protected]>.
65  * C. Scott Ananian <[email protected]> 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  * <[email protected]>
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 <[email protected]>
77  * Reset interrupt 0 timer to 100Hz after suspend
78  * Chad Miller <[email protected]>
79  * Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
80  * Richard Gooch <[email protected]>
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 <[email protected]>
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. <[email protected]>
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 <[email protected]>
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 <[email protected]>)
114  * Fix for bioses that don't zero the top part of the
115  * entrypoint offset (Mario Sitta <[email protected]>)
116  * (reported by Panos Katsaloulis <[email protected]>).
117  * Real mode power off patch (Walter Hofmann
118  * <[email protected]>).
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 <[email protected]>.
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 <[email protected]>).
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 <[email protected]>).
129  * Remove smp-power-off. SMP users must now specify
130  * "apm=power-off" on the kernel command line. Suggested
131  * by Jim Avera <[email protected]>, modified by Alan Cox
132  * <[email protected]>.
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 <[email protected]>).
136  * 1.13: Changes for new pm_ interfaces (Andy Henroid
137  * <[email protected]>).
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 <[email protected]>
144  * modified by sfr).
145  * Disable interrupts while we are suspended (Andy Henroid
146  * <[email protected]> fixed by sfr).
147  * Make power off work on SMP again (Tony Hoyle
148  * <[email protected]> and <[email protected]>) 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 <[email protected]>).
158  * Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable.
159  * (Arjan van de Ven <[email protected]>) modified by sfr.
160  * Work around byte swap bug in one of the Vaio's BIOS's
161  * (Marc Boucher <[email protected]>).
162  * Exposed the disable flag to dmi so that we can handle known
163  * broken APM (Alan Cox <[email protected]>).
164  * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
165  * calling it - instead idle. (Alan Cox <[email protected]>)
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 <[email protected]>)
171  * 1.16: Fix idle calling. (Andreas Steinmetz <[email protected]> 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 <[email protected]> and Thomas Hood)
175  * Ignore first resume after we generate our own resume event
176  * after a suspend (Thomas Hood)
177  * Daemonize now gets rid of our controlling terminal (sfr).
178  * CONFIG_APM_CPU_IDLE now just affects the default value of
179  * idle_threshold (sfr).
180  * Change name of kernel apm daemon (as it no longer idles) (sfr).
181  * 1.16ac: Fix up SMP support somewhat. You can now force SMP on and we
182  * make _all_ APM calls on the CPU#0. Fix unsafe sign bug.
183  * TODO: determine if its "boot CPU" or "CPU0" we want to lock to.
184  *
185  * APM 1.1 Reference:
186  *
187  * Intel Corporation, Microsoft Corporation. Advanced Power Management
188  * (APM) BIOS Interface Specification, Revision 1.1, September 1993.
189  * Intel Order Number 241704-001. Microsoft Part Number 781-110-X01.
190  *
191  * [This document is available free from Intel by calling 800.628.8686 (fax
192  * 916.356.6100) or 800.548.4725; or from
193  * http://www.microsoft.com/whdc/archive/amp_12.mspx It is also
194  * available from Microsoft by calling 206.882.8080.]
195  *
196  * APM 1.2 Reference:
197  * Intel Corporation, Microsoft Corporation. Advanced Power Management
198  * (APM) BIOS Interface Specification, Revision 1.2, February 1996.
199  *
200  * [This document is available from Microsoft at:
201  * http://www.microsoft.com/whdc/archive/amp_12.mspx]
202  */
203 
204 #define pr_fmt(fmt) "apm: " fmt
205 
206 #include <linux/module.h>
207 
208 #include <linux/poll.h>
209 #include <linux/types.h>
210 #include <linux/stddef.h>
211 #include <linux/timer.h>
212 #include <linux/fcntl.h>
213 #include <linux/slab.h>
214 #include <linux/stat.h>
215 #include <linux/proc_fs.h>
216 #include <linux/seq_file.h>
217 #include <linux/miscdevice.h>
218 #include <linux/apm_bios.h>
219 #include <linux/init.h>
220 #include <linux/time.h>
221 #include <linux/sched.h>
222 #include <linux/pm.h>
223 #include <linux/capability.h>
224 #include <linux/device.h>
225 #include <linux/kernel.h>
226 #include <linux/freezer.h>
227 #include <linux/smp.h>
228 #include <linux/dmi.h>
229 #include <linux/suspend.h>
230 #include <linux/kthread.h>
231 #include <linux/jiffies.h>
232 #include <linux/acpi.h>
233 #include <linux/syscore_ops.h>
234 #include <linux/i8253.h>
235 
236 #include <asm/uaccess.h>
237 #include <asm/desc.h>
238 #include <asm/olpc.h>
239 #include <asm/paravirt.h>
240 #include <asm/reboot.h>
241 
242 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
243 extern int (*console_blank_hook)(int);
244 #endif
245 
246 /*
247  * The apm_bios device is one of the misc char devices.
248  * This is its minor number.
249  */
250 #define APM_MINOR_DEV 134
251 
252 /*
253  * Various options can be changed at boot time as follows:
254  * (We allow underscores for compatibility with the modules code)
255  * apm=on/off enable/disable APM
256  * [no-]allow[-_]ints allow interrupts during BIOS calls
257  * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
258  * [no-]realmode[-_]power[-_]off switch to real mode before
259  * powering off
260  * [no-]debug log some debugging messages
261  * [no-]power[-_]off power off on shutdown
262  * [no-]smp Use apm even on an SMP box
263  * bounce[-_]interval=<n> number of ticks to ignore suspend
264  * bounces
265  * idle[-_]threshold=<n> System idle percentage above which to
266  * make APM BIOS idle calls. Set it to
267  * 100 to disable.
268  * idle[-_]period=<n> Period (in 1/100s of a second) over
269  * which the idle percentage is
270  * calculated.
271  */
272 
273 /* KNOWN PROBLEM MACHINES:
274  *
275  * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
276  * [Confirmed by TI representative]
277  * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
278  * [Confirmed by BIOS disassembly]
279  * [This may work now ...]
280  * P: Toshiba 1950S: battery life information only gets updated after resume
281  * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
282  * broken in BIOS [Reported by Garst R. Reese <[email protected]>]
283  * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
284  * Neale Banks <[email protected]> December 2000
285  *
286  * Legend: U = unusable with APM patches
287  * P = partially usable with APM patches
288  */
289 
290 /*
291  * Define as 1 to make the driver always call the APM BIOS busy
292  * routine even if the clock was not reported as slowed by the
293  * idle routine. Otherwise, define as 0.
294  */
295 #define ALWAYS_CALL_BUSY 1
296 
297 /*
298  * Define to make the APM BIOS calls zero all data segment registers (so
299  * that an incorrect BIOS implementation will cause a kernel panic if it
300  * tries to write to arbitrary memory).
301  */
302 #define APM_ZERO_SEGS
303 
304 #include <asm/apm.h>
305 
306 /*
307  * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
308  * This patched by Chad Miller <[email protected]>, original code by
309  * David Chen <[email protected]>
310  */
311 #undef INIT_TIMER_AFTER_SUSPEND
312 
313 #ifdef INIT_TIMER_AFTER_SUSPEND
314 #include <linux/timex.h>
315 #include <asm/io.h>
316 #include <linux/delay.h>
317 #endif
318 
319 /*
320  * Need to poll the APM BIOS every second
321  */
322 #define APM_CHECK_TIMEOUT (HZ)
323 
324 /*
325  * Ignore suspend events for this amount of time after a resume
326  */
327 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
328 
329 /*
330  * Maximum number of events stored
331  */
332 #define APM_MAX_EVENTS 20
333 
334 /*
335  * The per-file APM data
336  */
337 struct apm_user {
338  int magic;
339  struct apm_user *next;
340  unsigned int suser: 1;
341  unsigned int writer: 1;
342  unsigned int reader: 1;
343  unsigned int suspend_wait: 1;
344  int suspend_result;
345  int suspends_pending;
346  int standbys_pending;
347  int suspends_read;
348  int standbys_read;
349  int event_head;
350  int event_tail;
351  apm_event_t events[APM_MAX_EVENTS];
352 };
353 
354 /*
355  * The magic number in apm_user
356  */
357 #define APM_BIOS_MAGIC 0x4101
358 
359 /*
360  * idle percentage above which bios idle calls are done
361  */
362 #ifdef CONFIG_APM_CPU_IDLE
363 #warning deprecated CONFIG_APM_CPU_IDLE will be deleted in 2012
364 #define DEFAULT_IDLE_THRESHOLD 95
365 #else
366 #define DEFAULT_IDLE_THRESHOLD 100
367 #endif
368 #define DEFAULT_IDLE_PERIOD (100 / 3)
369 
370 /*
371  * Local variables
372  */
373 static struct {
374  unsigned long offset;
375  unsigned short segment;
376 } apm_bios_entry;
377 static int clock_slowed;
378 static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
379 static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
380 static int set_pm_idle;
381 static int suspends_pending;
382 static int standbys_pending;
383 static int ignore_sys_suspend;
384 static int ignore_normal_resume;
385 static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
386 
387 static bool debug __read_mostly;
388 static bool smp __read_mostly;
389 static int apm_disabled = -1;
390 #ifdef CONFIG_SMP
391 static bool power_off;
392 #else
393 static bool power_off = 1;
394 #endif
395 static bool realmode_power_off;
396 #ifdef CONFIG_APM_ALLOW_INTS
397 static bool allow_ints = 1;
398 #else
399 static bool allow_ints;
400 #endif
401 static bool broken_psr;
402 
403 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
404 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
405 static struct apm_user *user_list;
406 static DEFINE_SPINLOCK(user_list_lock);
407 static DEFINE_MUTEX(apm_mutex);
408 
409 /*
410  * Set up a segment that references the real mode segment 0x40
411  * that extends up to the end of page zero (that we have reserved).
412  * This is for buggy BIOS's that refer to (real mode) segment 0x40
413  * even though they are called in protected mode.
414  */
415 static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
416  (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
417 
418 static const char driver_version[] = "1.16ac"; /* no spaces */
419 
420 static struct task_struct *kapmd_task;
421 
422 /*
423  * APM event names taken from the APM 1.2 specification. These are
424  * the message codes that the BIOS uses to tell us about events
425  */
426 static const char * const apm_event_name[] = {
427  "system standby",
428  "system suspend",
429  "normal resume",
430  "critical resume",
431  "low battery",
432  "power status change",
433  "update time",
434  "critical suspend",
435  "user standby",
436  "user suspend",
437  "system standby resume",
438  "capabilities change"
439 };
440 #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
441 
442 typedef struct lookup_t {
443  int key;
444  char *msg;
445 } lookup_t;
446 
447 /*
448  * The BIOS returns a set of standard error codes in AX when the
449  * carry flag is set.
450  */
451 
452 static const lookup_t error_table[] = {
453 /* N/A { APM_SUCCESS, "Operation succeeded" }, */
454  { APM_DISABLED, "Power management disabled" },
455  { APM_CONNECTED, "Real mode interface already connected" },
456  { APM_NOT_CONNECTED, "Interface not connected" },
457  { APM_16_CONNECTED, "16 bit interface already connected" },
458 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
459  { APM_32_CONNECTED, "32 bit interface already connected" },
460  { APM_32_UNSUPPORTED, "32 bit interface not supported" },
461  { APM_BAD_DEVICE, "Unrecognized device ID" },
462  { APM_BAD_PARAM, "Parameter out of range" },
463  { APM_NOT_ENGAGED, "Interface not engaged" },
464  { APM_BAD_FUNCTION, "Function not supported" },
465  { APM_RESUME_DISABLED, "Resume timer disabled" },
466  { APM_BAD_STATE, "Unable to enter requested state" },
467 /* N/A { APM_NO_EVENTS, "No events pending" }, */
468  { APM_NO_ERROR, "BIOS did not set a return code" },
469  { APM_NOT_PRESENT, "No APM present" }
470 };
471 #define ERROR_COUNT ARRAY_SIZE(error_table)
472 
482 static void apm_error(char *str, int err)
483 {
484  int i;
485 
486  for (i = 0; i < ERROR_COUNT; i++)
487  if (error_table[i].key == err)
488  break;
489  if (i < ERROR_COUNT)
490  pr_notice("%s: %s\n", str, error_table[i].msg);
491  else if (err < 0)
492  pr_notice("%s: linux error code %i\n", str, err);
493  else
494  pr_notice("%s: unknown error code %#2.2x\n",
495  str, err);
496 }
497 
498 /*
499  * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
500  * apm_info.allow_ints, we are being really paranoid here! Not only
501  * are interrupts disabled, but all the segment registers (except SS)
502  * are saved and zeroed this means that if the BIOS tries to reference
503  * any data without explicitly loading the segment registers, the kernel
504  * will fault immediately rather than have some unforeseen circumstances
505  * for the rest of the kernel. And it will be very obvious! :-) Doing
506  * this depends on CS referring to the same physical memory as DS so that
507  * DS can be zeroed before the call. Unfortunately, we can't do anything
508  * about the stack segment/pointer. Also, we tell the compiler that
509  * everything could change.
510  *
511  * Also, we KNOW that for the non error case of apm_bios_call, there
512  * is no useful data returned in the low order 8 bits of eax.
513  */
514 
515 static inline unsigned long __apm_irq_save(void)
516 {
517  unsigned long flags;
518  local_save_flags(flags);
519  if (apm_info.allow_ints) {
520  if (irqs_disabled_flags(flags))
521  local_irq_enable();
522  } else
523  local_irq_disable();
524 
525  return flags;
526 }
527 
528 #define apm_irq_save(flags) \
529  do { flags = __apm_irq_save(); } while (0)
530 
531 static inline void apm_irq_restore(unsigned long flags)
532 {
533  if (irqs_disabled_flags(flags))
534  local_irq_disable();
535  else if (irqs_disabled())
536  local_irq_enable();
537 }
538 
539 #ifdef APM_ZERO_SEGS
540 # define APM_DECL_SEGS \
541  unsigned int saved_fs; unsigned int saved_gs;
542 # define APM_DO_SAVE_SEGS \
543  savesegment(fs, saved_fs); savesegment(gs, saved_gs)
544 # define APM_DO_RESTORE_SEGS \
545  loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
546 #else
547 # define APM_DECL_SEGS
548 # define APM_DO_SAVE_SEGS
549 # define APM_DO_RESTORE_SEGS
550 #endif
551 
552 struct apm_bios_call {
553  u32 func;
554  /* In and out */
555  u32 ebx;
556  u32 ecx;
557  /* Out only */
558  u32 eax;
559  u32 edx;
560  u32 esi;
561 
562  /* Error: -ENOMEM, or bits 8-15 of eax */
563  int err;
564 };
565 
580 static long __apm_bios_call(void *_call)
581 {
582  APM_DECL_SEGS
583  unsigned long flags;
584  int cpu;
585  struct desc_struct save_desc_40;
586  struct desc_struct *gdt;
587  struct apm_bios_call *call = _call;
588 
589  cpu = get_cpu();
590  BUG_ON(cpu != 0);
591  gdt = get_cpu_gdt_table(cpu);
592  save_desc_40 = gdt[0x40 / 8];
593  gdt[0x40 / 8] = bad_bios_desc;
594 
595  apm_irq_save(flags);
596  APM_DO_SAVE_SEGS;
597  apm_bios_call_asm(call->func, call->ebx, call->ecx,
598  &call->eax, &call->ebx, &call->ecx, &call->edx,
599  &call->esi);
600  APM_DO_RESTORE_SEGS;
601  apm_irq_restore(flags);
602  gdt[0x40 / 8] = save_desc_40;
603  put_cpu();
604 
605  return call->eax & 0xff;
606 }
607 
608 /* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
609 static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
610 {
611  int ret;
612 
613  /* Don't bother with work_on_cpu in the common case, so we don't
614  * have to worry about OOM or overhead. */
615  if (get_cpu() == 0) {
616  ret = fn(call);
617  put_cpu();
618  } else {
619  put_cpu();
620  ret = work_on_cpu(0, fn, call);
621  }
622 
623  /* work_on_cpu can fail with -ENOMEM */
624  if (ret < 0)
625  call->err = ret;
626  else
627  call->err = (call->eax >> 8) & 0xff;
628 
629  return ret;
630 }
631 
638 static int apm_bios_call(struct apm_bios_call *call)
639 {
640  return on_cpu0(__apm_bios_call, call);
641 }
642 
655 static long __apm_bios_call_simple(void *_call)
656 {
657  u8 error;
658  APM_DECL_SEGS
659  unsigned long flags;
660  int cpu;
661  struct desc_struct save_desc_40;
662  struct desc_struct *gdt;
663  struct apm_bios_call *call = _call;
664 
665  cpu = get_cpu();
666  BUG_ON(cpu != 0);
667  gdt = get_cpu_gdt_table(cpu);
668  save_desc_40 = gdt[0x40 / 8];
669  gdt[0x40 / 8] = bad_bios_desc;
670 
671  apm_irq_save(flags);
672  APM_DO_SAVE_SEGS;
673  error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
674  &call->eax);
675  APM_DO_RESTORE_SEGS;
676  apm_irq_restore(flags);
677  gdt[0x40 / 8] = save_desc_40;
678  put_cpu();
679  return error;
680 }
681 
696 static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
697  int *err)
698 {
699  struct apm_bios_call call;
700  int ret;
701 
702  call.func = func;
703  call.ebx = ebx_in;
704  call.ecx = ecx_in;
705 
706  ret = on_cpu0(__apm_bios_call_simple, &call);
707  *eax = call.eax;
708  *err = call.err;
709  return ret;
710 }
711 
728 static int apm_driver_version(u_short *val)
729 {
730  u32 eax;
731  int err;
732 
733  if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
734  return err;
735  *val = eax;
736  return APM_SUCCESS;
737 }
738 
755 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
756 {
757  struct apm_bios_call call;
758 
759  call.func = APM_FUNC_GET_EVENT;
760  call.ebx = call.ecx = 0;
761 
762  if (apm_bios_call(&call))
763  return call.err;
764 
765  *event = call.ebx;
766  if (apm_info.connection_version < 0x0102)
767  *info = ~0; /* indicate info not valid */
768  else
769  *info = call.ecx;
770  return APM_SUCCESS;
771 }
772 
787 static int set_power_state(u_short what, u_short state)
788 {
789  u32 eax;
790  int err;
791 
792  if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
793  return err;
794  return APM_SUCCESS;
795 }
796 
804 static int set_system_power_state(u_short state)
805 {
806  return set_power_state(APM_DEVICE_ALL, state);
807 }
808 
818 static int apm_do_idle(void)
819 {
820  u32 eax;
821  u8 ret = 0;
822  int idled = 0;
823  int polling;
824  int err = 0;
825 
826  polling = !!(current_thread_info()->status & TS_POLLING);
827  if (polling) {
828  current_thread_info()->status &= ~TS_POLLING;
829  /*
830  * TS_POLLING-cleared state must be visible before we
831  * test NEED_RESCHED:
832  */
833  smp_mb();
834  }
835  if (!need_resched()) {
836  idled = 1;
837  ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
838  }
839  if (polling)
840  current_thread_info()->status |= TS_POLLING;
841 
842  if (!idled)
843  return 0;
844 
845  if (ret) {
846  static unsigned long t;
847 
848  /* This always fails on some SMP boards running UP kernels.
849  * Only report the failure the first 5 times.
850  */
851  if (++t < 5) {
852  printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
853  t = jiffies;
854  }
855  return -1;
856  }
857  clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
858  return clock_slowed;
859 }
860 
867 static void apm_do_busy(void)
868 {
869  u32 dummy;
870  int err;
871 
872  if (clock_slowed || ALWAYS_CALL_BUSY) {
873  (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
874  clock_slowed = 0;
875  }
876 }
877 
878 /*
879  * If no process has really been interested in
880  * the CPU for some time, we want to call BIOS
881  * power management - we probably want
882  * to conserve power.
883  */
884 #define IDLE_CALC_LIMIT (HZ * 100)
885 #define IDLE_LEAKY_MAX 16
886 
887 static void (*original_pm_idle)(void) __read_mostly;
888 
897 static void apm_cpu_idle(void)
898 {
899  static int use_apm_idle; /* = 0 */
900  static unsigned int last_jiffies; /* = 0 */
901  static unsigned int last_stime; /* = 0 */
902 
903  int apm_idle_done = 0;
904  unsigned int jiffies_since_last_check = jiffies - last_jiffies;
905  unsigned int bucket;
906 
907  WARN_ONCE(1, "deprecated apm_cpu_idle will be deleted in 2012");
908 recalc:
909  if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
910  use_apm_idle = 0;
911  last_jiffies = jiffies;
912  last_stime = current->stime;
913  } else if (jiffies_since_last_check > idle_period) {
914  unsigned int idle_percentage;
915 
916  idle_percentage = current->stime - last_stime;
917  idle_percentage *= 100;
918  idle_percentage /= jiffies_since_last_check;
919  use_apm_idle = (idle_percentage > idle_threshold);
920  if (apm_info.forbid_idle)
921  use_apm_idle = 0;
922  last_jiffies = jiffies;
923  last_stime = current->stime;
924  }
925 
926  bucket = IDLE_LEAKY_MAX;
927 
928  while (!need_resched()) {
929  if (use_apm_idle) {
930  unsigned int t;
931 
932  t = jiffies;
933  switch (apm_do_idle()) {
934  case 0:
935  apm_idle_done = 1;
936  if (t != jiffies) {
937  if (bucket) {
938  bucket = IDLE_LEAKY_MAX;
939  continue;
940  }
941  } else if (bucket) {
942  bucket--;
943  continue;
944  }
945  break;
946  case 1:
947  apm_idle_done = 1;
948  break;
949  default: /* BIOS refused */
950  break;
951  }
952  }
953  if (original_pm_idle)
954  original_pm_idle();
955  else
956  default_idle();
957  local_irq_disable();
958  jiffies_since_last_check = jiffies - last_jiffies;
959  if (jiffies_since_last_check > idle_period)
960  goto recalc;
961  }
962 
963  if (apm_idle_done)
964  apm_do_busy();
965 
966  local_irq_enable();
967 }
968 
979 static void apm_power_off(void)
980 {
981  /* Some bioses don't like being called from CPU != 0 */
982  if (apm_info.realmode_power_off) {
983  set_cpus_allowed_ptr(current, cpumask_of(0));
984  machine_real_restart(MRR_APM);
985  } else {
986  (void)set_system_power_state(APM_STATE_OFF);
987  }
988 }
989 
990 #ifdef CONFIG_APM_DO_ENABLE
991 
999 static int apm_enable_power_management(int enable)
1000 {
1001  u32 eax;
1002  int err;
1003 
1004  if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1005  return APM_NOT_ENGAGED;
1006  if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1007  enable, &eax, &err))
1008  return err;
1009  if (enable)
1010  apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1011  else
1012  apm_info.bios.flags |= APM_BIOS_DISABLED;
1013  return APM_SUCCESS;
1014 }
1015 #endif
1016 
1031 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1032 {
1033  struct apm_bios_call call;
1034 
1035  call.func = APM_FUNC_GET_STATUS;
1036  call.ebx = APM_DEVICE_ALL;
1037  call.ecx = 0;
1038 
1039  if (apm_info.get_power_status_broken)
1040  return APM_32_UNSUPPORTED;
1041  if (apm_bios_call(&call))
1042  return call.err;
1043  *status = call.ebx;
1044  *bat = call.ecx;
1045  if (apm_info.get_power_status_swabinminutes) {
1046  *life = swab16((u16)call.edx);
1047  *life |= 0x8000;
1048  } else
1049  *life = call.edx;
1050  return APM_SUCCESS;
1051 }
1052 
1053 #if 0
1054 static int apm_get_battery_status(u_short which, u_short *status,
1055  u_short *bat, u_short *life, u_short *nbat)
1056 {
1057  u32 eax;
1058  u32 ebx;
1059  u32 ecx;
1060  u32 edx;
1061  u32 esi;
1062 
1063  if (apm_info.connection_version < 0x0102) {
1064  /* pretend we only have one battery. */
1065  if (which != 1)
1066  return APM_BAD_DEVICE;
1067  *nbat = 1;
1068  return apm_get_power_status(status, bat, life);
1069  }
1070 
1071  if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1072  &ebx, &ecx, &edx, &esi))
1073  return (eax >> 8) & 0xff;
1074  *status = ebx;
1075  *bat = ecx;
1076  *life = edx;
1077  *nbat = esi;
1078  return APM_SUCCESS;
1079 }
1080 #endif
1081 
1091 static int apm_engage_power_management(u_short device, int enable)
1092 {
1093  u32 eax;
1094  int err;
1095 
1096  if ((enable == 0) && (device == APM_DEVICE_ALL)
1097  && (apm_info.bios.flags & APM_BIOS_DISABLED))
1098  return APM_DISABLED;
1099  if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1100  &eax, &err))
1101  return err;
1102  if (device == APM_DEVICE_ALL) {
1103  if (enable)
1104  apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1105  else
1106  apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1107  }
1108  return APM_SUCCESS;
1109 }
1110 
1111 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1112 
1123 static int apm_console_blank(int blank)
1124 {
1125  int error = APM_NOT_ENGAGED; /* silence gcc */
1126  int i;
1127  u_short state;
1128  static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1129 
1130  state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1131 
1132  for (i = 0; i < ARRAY_SIZE(dev); i++) {
1133  error = set_power_state(dev[i], state);
1134 
1135  if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1136  return 1;
1137 
1138  if (error == APM_NOT_ENGAGED)
1139  break;
1140  }
1141 
1142  if (error == APM_NOT_ENGAGED) {
1143  static int tried;
1144  int eng_error;
1145  if (tried++ == 0) {
1146  eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1147  if (eng_error) {
1148  apm_error("set display", error);
1149  apm_error("engage interface", eng_error);
1150  return 0;
1151  } else
1152  return apm_console_blank(blank);
1153  }
1154  }
1155  apm_error("set display", error);
1156  return 0;
1157 }
1158 #endif
1159 
1160 static int queue_empty(struct apm_user *as)
1161 {
1162  return as->event_head == as->event_tail;
1163 }
1164 
1165 static apm_event_t get_queued_event(struct apm_user *as)
1166 {
1167  if (++as->event_tail >= APM_MAX_EVENTS)
1168  as->event_tail = 0;
1169  return as->events[as->event_tail];
1170 }
1171 
1172 static void queue_event(apm_event_t event, struct apm_user *sender)
1173 {
1174  struct apm_user *as;
1175 
1176  spin_lock(&user_list_lock);
1177  if (user_list == NULL)
1178  goto out;
1179  for (as = user_list; as != NULL; as = as->next) {
1180  if ((as == sender) || (!as->reader))
1181  continue;
1182  if (++as->event_head >= APM_MAX_EVENTS)
1183  as->event_head = 0;
1184 
1185  if (as->event_head == as->event_tail) {
1186  static int notified;
1187 
1188  if (notified++ == 0)
1189  pr_err("an event queue overflowed\n");
1190  if (++as->event_tail >= APM_MAX_EVENTS)
1191  as->event_tail = 0;
1192  }
1193  as->events[as->event_head] = event;
1194  if (!as->suser || !as->writer)
1195  continue;
1196  switch (event) {
1197  case APM_SYS_SUSPEND:
1198  case APM_USER_SUSPEND:
1199  as->suspends_pending++;
1200  suspends_pending++;
1201  break;
1202 
1203  case APM_SYS_STANDBY:
1204  case APM_USER_STANDBY:
1205  as->standbys_pending++;
1206  standbys_pending++;
1207  break;
1208  }
1209  }
1210  wake_up_interruptible(&apm_waitqueue);
1211 out:
1212  spin_unlock(&user_list_lock);
1213 }
1214 
1215 static void reinit_timer(void)
1216 {
1217 #ifdef INIT_TIMER_AFTER_SUSPEND
1218  unsigned long flags;
1219 
1220  raw_spin_lock_irqsave(&i8253_lock, flags);
1221  /* set the clock to HZ */
1222  outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
1223  udelay(10);
1224  outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
1225  udelay(10);
1226  outb_p(LATCH >> 8, PIT_CH0); /* MSB */
1227  udelay(10);
1228  raw_spin_unlock_irqrestore(&i8253_lock, flags);
1229 #endif
1230 }
1231 
1232 static int suspend(int vetoable)
1233 {
1234  int err;
1235  struct apm_user *as;
1236 
1237  dpm_suspend_start(PMSG_SUSPEND);
1238  dpm_suspend_end(PMSG_SUSPEND);
1239 
1240  local_irq_disable();
1241  syscore_suspend();
1242 
1243  local_irq_enable();
1244 
1245  save_processor_state();
1246  err = set_system_power_state(APM_STATE_SUSPEND);
1247  ignore_normal_resume = 1;
1248  restore_processor_state();
1249 
1250  local_irq_disable();
1251  reinit_timer();
1252 
1253  if (err == APM_NO_ERROR)
1254  err = APM_SUCCESS;
1255  if (err != APM_SUCCESS)
1256  apm_error("suspend", err);
1257  err = (err == APM_SUCCESS) ? 0 : -EIO;
1258 
1259  syscore_resume();
1260  local_irq_enable();
1261 
1262  dpm_resume_start(PMSG_RESUME);
1263  dpm_resume_end(PMSG_RESUME);
1264 
1265  queue_event(APM_NORMAL_RESUME, NULL);
1266  spin_lock(&user_list_lock);
1267  for (as = user_list; as != NULL; as = as->next) {
1268  as->suspend_wait = 0;
1269  as->suspend_result = err;
1270  }
1271  spin_unlock(&user_list_lock);
1272  wake_up_interruptible(&apm_suspend_waitqueue);
1273  return err;
1274 }
1275 
1276 static void standby(void)
1277 {
1278  int err;
1279 
1280  dpm_suspend_end(PMSG_SUSPEND);
1281 
1282  local_irq_disable();
1283  syscore_suspend();
1284  local_irq_enable();
1285 
1286  err = set_system_power_state(APM_STATE_STANDBY);
1287  if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1288  apm_error("standby", err);
1289 
1290  local_irq_disable();
1291  syscore_resume();
1292  local_irq_enable();
1293 
1294  dpm_resume_start(PMSG_RESUME);
1295 }
1296 
1297 static apm_event_t get_event(void)
1298 {
1299  int error;
1300  apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1301  apm_eventinfo_t info;
1302 
1303  static int notified;
1304 
1305  /* we don't use the eventinfo */
1306  error = apm_get_event(&event, &info);
1307  if (error == APM_SUCCESS)
1308  return event;
1309 
1310  if ((error != APM_NO_EVENTS) && (notified++ == 0))
1311  apm_error("get_event", error);
1312 
1313  return 0;
1314 }
1315 
1316 static void check_events(void)
1317 {
1318  apm_event_t event;
1319  static unsigned long last_resume;
1320  static int ignore_bounce;
1321 
1322  while ((event = get_event()) != 0) {
1323  if (debug) {
1324  if (event <= NR_APM_EVENT_NAME)
1325  printk(KERN_DEBUG "apm: received %s notify\n",
1326  apm_event_name[event - 1]);
1327  else
1328  printk(KERN_DEBUG "apm: received unknown "
1329  "event 0x%02x\n", event);
1330  }
1331  if (ignore_bounce
1332  && (time_after(jiffies, last_resume + bounce_interval)))
1333  ignore_bounce = 0;
1334 
1335  switch (event) {
1336  case APM_SYS_STANDBY:
1337  case APM_USER_STANDBY:
1338  queue_event(event, NULL);
1339  if (standbys_pending <= 0)
1340  standby();
1341  break;
1342 
1343  case APM_USER_SUSPEND:
1344 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1345  if (apm_info.connection_version > 0x100)
1346  set_system_power_state(APM_STATE_REJECT);
1347  break;
1348 #endif
1349  case APM_SYS_SUSPEND:
1350  if (ignore_bounce) {
1351  if (apm_info.connection_version > 0x100)
1352  set_system_power_state(APM_STATE_REJECT);
1353  break;
1354  }
1355  /*
1356  * If we are already processing a SUSPEND,
1357  * then further SUSPEND events from the BIOS
1358  * will be ignored. We also return here to
1359  * cope with the fact that the Thinkpads keep
1360  * sending a SUSPEND event until something else
1361  * happens!
1362  */
1363  if (ignore_sys_suspend)
1364  return;
1365  ignore_sys_suspend = 1;
1366  queue_event(event, NULL);
1367  if (suspends_pending <= 0)
1368  (void) suspend(1);
1369  break;
1370 
1371  case APM_NORMAL_RESUME:
1372  case APM_CRITICAL_RESUME:
1373  case APM_STANDBY_RESUME:
1374  ignore_sys_suspend = 0;
1375  last_resume = jiffies;
1376  ignore_bounce = 1;
1377  if ((event != APM_NORMAL_RESUME)
1378  || (ignore_normal_resume == 0)) {
1379  dpm_resume_end(PMSG_RESUME);
1380  queue_event(event, NULL);
1381  }
1382  ignore_normal_resume = 0;
1383  break;
1384 
1385  case APM_CAPABILITY_CHANGE:
1386  case APM_LOW_BATTERY:
1387  case APM_POWER_STATUS_CHANGE:
1388  queue_event(event, NULL);
1389  /* If needed, notify drivers here */
1390  break;
1391 
1392  case APM_UPDATE_TIME:
1393  break;
1394 
1395  case APM_CRITICAL_SUSPEND:
1396  /*
1397  * We are not allowed to reject a critical suspend.
1398  */
1399  (void)suspend(0);
1400  break;
1401  }
1402  }
1403 }
1404 
1405 static void apm_event_handler(void)
1406 {
1407  static int pending_count = 4;
1408  int err;
1409 
1410  if ((standbys_pending > 0) || (suspends_pending > 0)) {
1411  if ((apm_info.connection_version > 0x100) &&
1412  (pending_count-- <= 0)) {
1413  pending_count = 4;
1414  if (debug)
1415  printk(KERN_DEBUG "apm: setting state busy\n");
1416  err = set_system_power_state(APM_STATE_BUSY);
1417  if (err)
1418  apm_error("busy", err);
1419  }
1420  } else
1421  pending_count = 4;
1422  check_events();
1423 }
1424 
1425 /*
1426  * This is the APM thread main loop.
1427  */
1428 
1429 static void apm_mainloop(void)
1430 {
1431  DECLARE_WAITQUEUE(wait, current);
1432 
1433  add_wait_queue(&apm_waitqueue, &wait);
1434  set_current_state(TASK_INTERRUPTIBLE);
1435  for (;;) {
1436  schedule_timeout(APM_CHECK_TIMEOUT);
1437  if (kthread_should_stop())
1438  break;
1439  /*
1440  * Ok, check all events, check for idle (and mark us sleeping
1441  * so as not to count towards the load average)..
1442  */
1443  set_current_state(TASK_INTERRUPTIBLE);
1444  apm_event_handler();
1445  }
1446  remove_wait_queue(&apm_waitqueue, &wait);
1447 }
1448 
1449 static int check_apm_user(struct apm_user *as, const char *func)
1450 {
1451  if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1452  pr_err("%s passed bad filp\n", func);
1453  return 1;
1454  }
1455  return 0;
1456 }
1457 
1458 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1459 {
1460  struct apm_user *as;
1461  int i;
1462  apm_event_t event;
1463 
1464  as = fp->private_data;
1465  if (check_apm_user(as, "read"))
1466  return -EIO;
1467  if ((int)count < sizeof(apm_event_t))
1468  return -EINVAL;
1469  if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1470  return -EAGAIN;
1471  wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1472  i = count;
1473  while ((i >= sizeof(event)) && !queue_empty(as)) {
1474  event = get_queued_event(as);
1475  if (copy_to_user(buf, &event, sizeof(event))) {
1476  if (i < count)
1477  break;
1478  return -EFAULT;
1479  }
1480  switch (event) {
1481  case APM_SYS_SUSPEND:
1482  case APM_USER_SUSPEND:
1483  as->suspends_read++;
1484  break;
1485 
1486  case APM_SYS_STANDBY:
1487  case APM_USER_STANDBY:
1488  as->standbys_read++;
1489  break;
1490  }
1491  buf += sizeof(event);
1492  i -= sizeof(event);
1493  }
1494  if (i < count)
1495  return count - i;
1496  if (signal_pending(current))
1497  return -ERESTARTSYS;
1498  return 0;
1499 }
1500 
1501 static unsigned int do_poll(struct file *fp, poll_table *wait)
1502 {
1503  struct apm_user *as;
1504 
1505  as = fp->private_data;
1506  if (check_apm_user(as, "poll"))
1507  return 0;
1508  poll_wait(fp, &apm_waitqueue, wait);
1509  if (!queue_empty(as))
1510  return POLLIN | POLLRDNORM;
1511  return 0;
1512 }
1513 
1514 static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1515 {
1516  struct apm_user *as;
1517  int ret;
1518 
1519  as = filp->private_data;
1520  if (check_apm_user(as, "ioctl"))
1521  return -EIO;
1522  if (!as->suser || !as->writer)
1523  return -EPERM;
1524  switch (cmd) {
1525  case APM_IOC_STANDBY:
1526  mutex_lock(&apm_mutex);
1527  if (as->standbys_read > 0) {
1528  as->standbys_read--;
1529  as->standbys_pending--;
1530  standbys_pending--;
1531  } else
1532  queue_event(APM_USER_STANDBY, as);
1533  if (standbys_pending <= 0)
1534  standby();
1535  mutex_unlock(&apm_mutex);
1536  break;
1537  case APM_IOC_SUSPEND:
1538  mutex_lock(&apm_mutex);
1539  if (as->suspends_read > 0) {
1540  as->suspends_read--;
1541  as->suspends_pending--;
1542  suspends_pending--;
1543  } else
1544  queue_event(APM_USER_SUSPEND, as);
1545  if (suspends_pending <= 0) {
1546  ret = suspend(1);
1547  mutex_unlock(&apm_mutex);
1548  } else {
1549  as->suspend_wait = 1;
1550  mutex_unlock(&apm_mutex);
1551  wait_event_interruptible(apm_suspend_waitqueue,
1552  as->suspend_wait == 0);
1553  ret = as->suspend_result;
1554  }
1555  return ret;
1556  default:
1557  return -ENOTTY;
1558  }
1559  return 0;
1560 }
1561 
1562 static int do_release(struct inode *inode, struct file *filp)
1563 {
1564  struct apm_user *as;
1565 
1566  as = filp->private_data;
1567  if (check_apm_user(as, "release"))
1568  return 0;
1569  filp->private_data = NULL;
1570  if (as->standbys_pending > 0) {
1571  standbys_pending -= as->standbys_pending;
1572  if (standbys_pending <= 0)
1573  standby();
1574  }
1575  if (as->suspends_pending > 0) {
1576  suspends_pending -= as->suspends_pending;
1577  if (suspends_pending <= 0)
1578  (void) suspend(1);
1579  }
1580  spin_lock(&user_list_lock);
1581  if (user_list == as)
1582  user_list = as->next;
1583  else {
1584  struct apm_user *as1;
1585 
1586  for (as1 = user_list;
1587  (as1 != NULL) && (as1->next != as);
1588  as1 = as1->next)
1589  ;
1590  if (as1 == NULL)
1591  pr_err("filp not in user list\n");
1592  else
1593  as1->next = as->next;
1594  }
1595  spin_unlock(&user_list_lock);
1596  kfree(as);
1597  return 0;
1598 }
1599 
1600 static int do_open(struct inode *inode, struct file *filp)
1601 {
1602  struct apm_user *as;
1603 
1604  as = kmalloc(sizeof(*as), GFP_KERNEL);
1605  if (as == NULL)
1606  return -ENOMEM;
1607 
1608  as->magic = APM_BIOS_MAGIC;
1609  as->event_tail = as->event_head = 0;
1610  as->suspends_pending = as->standbys_pending = 0;
1611  as->suspends_read = as->standbys_read = 0;
1612  /*
1613  * XXX - this is a tiny bit broken, when we consider BSD
1614  * process accounting. If the device is opened by root, we
1615  * instantly flag that we used superuser privs. Who knows,
1616  * we might close the device immediately without doing a
1617  * privileged operation -- cevans
1618  */
1619  as->suser = capable(CAP_SYS_ADMIN);
1620  as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1621  as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1622  spin_lock(&user_list_lock);
1623  as->next = user_list;
1624  user_list = as;
1625  spin_unlock(&user_list_lock);
1626  filp->private_data = as;
1627  return 0;
1628 }
1629 
1630 static int proc_apm_show(struct seq_file *m, void *v)
1631 {
1632  unsigned short bx;
1633  unsigned short cx;
1634  unsigned short dx;
1635  int error;
1636  unsigned short ac_line_status = 0xff;
1637  unsigned short battery_status = 0xff;
1638  unsigned short battery_flag = 0xff;
1639  int percentage = -1;
1640  int time_units = -1;
1641  char *units = "?";
1642 
1643  if ((num_online_cpus() == 1) &&
1644  !(error = apm_get_power_status(&bx, &cx, &dx))) {
1645  ac_line_status = (bx >> 8) & 0xff;
1646  battery_status = bx & 0xff;
1647  if ((cx & 0xff) != 0xff)
1648  percentage = cx & 0xff;
1649 
1650  if (apm_info.connection_version > 0x100) {
1651  battery_flag = (cx >> 8) & 0xff;
1652  if (dx != 0xffff) {
1653  units = (dx & 0x8000) ? "min" : "sec";
1654  time_units = dx & 0x7fff;
1655  }
1656  }
1657  }
1658  /* Arguments, with symbols from linux/apm_bios.h. Information is
1659  from the Get Power Status (0x0a) call unless otherwise noted.
1660 
1661  0) Linux driver version (this will change if format changes)
1662  1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1663  2) APM flags from APM Installation Check (0x00):
1664  bit 0: APM_16_BIT_SUPPORT
1665  bit 1: APM_32_BIT_SUPPORT
1666  bit 2: APM_IDLE_SLOWS_CLOCK
1667  bit 3: APM_BIOS_DISABLED
1668  bit 4: APM_BIOS_DISENGAGED
1669  3) AC line status
1670  0x00: Off-line
1671  0x01: On-line
1672  0x02: On backup power (BIOS >= 1.1 only)
1673  0xff: Unknown
1674  4) Battery status
1675  0x00: High
1676  0x01: Low
1677  0x02: Critical
1678  0x03: Charging
1679  0x04: Selected battery not present (BIOS >= 1.2 only)
1680  0xff: Unknown
1681  5) Battery flag
1682  bit 0: High
1683  bit 1: Low
1684  bit 2: Critical
1685  bit 3: Charging
1686  bit 7: No system battery
1687  0xff: Unknown
1688  6) Remaining battery life (percentage of charge):
1689  0-100: valid
1690  -1: Unknown
1691  7) Remaining battery life (time units):
1692  Number of remaining minutes or seconds
1693  -1: Unknown
1694  8) min = minutes; sec = seconds */
1695 
1696  seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1697  driver_version,
1698  (apm_info.bios.version >> 8) & 0xff,
1699  apm_info.bios.version & 0xff,
1700  apm_info.bios.flags,
1701  ac_line_status,
1702  battery_status,
1703  battery_flag,
1704  percentage,
1705  time_units,
1706  units);
1707  return 0;
1708 }
1709 
1710 static int proc_apm_open(struct inode *inode, struct file *file)
1711 {
1712  return single_open(file, proc_apm_show, NULL);
1713 }
1714 
1715 static const struct file_operations apm_file_ops = {
1716  .owner = THIS_MODULE,
1717  .open = proc_apm_open,
1718  .read = seq_read,
1719  .llseek = seq_lseek,
1720  .release = single_release,
1721 };
1722 
1723 static int apm(void *unused)
1724 {
1725  unsigned short bx;
1726  unsigned short cx;
1727  unsigned short dx;
1728  int error;
1729  char *power_stat;
1730  char *bat_stat;
1731 
1732  /* 2002/08/01 - WT
1733  * This is to avoid random crashes at boot time during initialization
1734  * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1735  * Some bioses don't like being called from CPU != 0.
1736  * Method suggested by Ingo Molnar.
1737  */
1738  set_cpus_allowed_ptr(current, cpumask_of(0));
1739  BUG_ON(smp_processor_id() != 0);
1740 
1741  if (apm_info.connection_version == 0) {
1742  apm_info.connection_version = apm_info.bios.version;
1743  if (apm_info.connection_version > 0x100) {
1744  /*
1745  * We only support BIOSs up to version 1.2
1746  */
1747  if (apm_info.connection_version > 0x0102)
1748  apm_info.connection_version = 0x0102;
1749  error = apm_driver_version(&apm_info.connection_version);
1750  if (error != APM_SUCCESS) {
1751  apm_error("driver version", error);
1752  /* Fall back to an APM 1.0 connection. */
1753  apm_info.connection_version = 0x100;
1754  }
1755  }
1756  }
1757 
1758  if (debug)
1759  printk(KERN_INFO "apm: Connection version %d.%d\n",
1760  (apm_info.connection_version >> 8) & 0xff,
1761  apm_info.connection_version & 0xff);
1762 
1763 #ifdef CONFIG_APM_DO_ENABLE
1764  if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1765  /*
1766  * This call causes my NEC UltraLite Versa 33/C to hang if it
1767  * is booted with PM disabled but not in the docking station.
1768  * Unfortunate ...
1769  */
1770  error = apm_enable_power_management(1);
1771  if (error) {
1772  apm_error("enable power management", error);
1773  return -1;
1774  }
1775  }
1776 #endif
1777 
1778  if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1779  && (apm_info.connection_version > 0x0100)) {
1780  error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1781  if (error) {
1782  apm_error("engage power management", error);
1783  return -1;
1784  }
1785  }
1786 
1787  if (debug && (num_online_cpus() == 1 || smp)) {
1788  error = apm_get_power_status(&bx, &cx, &dx);
1789  if (error)
1790  printk(KERN_INFO "apm: power status not available\n");
1791  else {
1792  switch ((bx >> 8) & 0xff) {
1793  case 0:
1794  power_stat = "off line";
1795  break;
1796  case 1:
1797  power_stat = "on line";
1798  break;
1799  case 2:
1800  power_stat = "on backup power";
1801  break;
1802  default:
1803  power_stat = "unknown";
1804  break;
1805  }
1806  switch (bx & 0xff) {
1807  case 0:
1808  bat_stat = "high";
1809  break;
1810  case 1:
1811  bat_stat = "low";
1812  break;
1813  case 2:
1814  bat_stat = "critical";
1815  break;
1816  case 3:
1817  bat_stat = "charging";
1818  break;
1819  default:
1820  bat_stat = "unknown";
1821  break;
1822  }
1823  printk(KERN_INFO
1824  "apm: AC %s, battery status %s, battery life ",
1825  power_stat, bat_stat);
1826  if ((cx & 0xff) == 0xff)
1827  printk("unknown\n");
1828  else
1829  printk("%d%%\n", cx & 0xff);
1830  if (apm_info.connection_version > 0x100) {
1831  printk(KERN_INFO
1832  "apm: battery flag 0x%02x, battery life ",
1833  (cx >> 8) & 0xff);
1834  if (dx == 0xffff)
1835  printk("unknown\n");
1836  else
1837  printk("%d %s\n", dx & 0x7fff,
1838  (dx & 0x8000) ?
1839  "minutes" : "seconds");
1840  }
1841  }
1842  }
1843 
1844  /* Install our power off handler.. */
1845  if (power_off)
1846  pm_power_off = apm_power_off;
1847 
1848  if (num_online_cpus() == 1 || smp) {
1849 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1850  console_blank_hook = apm_console_blank;
1851 #endif
1852  apm_mainloop();
1853 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1854  console_blank_hook = NULL;
1855 #endif
1856  }
1857 
1858  return 0;
1859 }
1860 
1861 #ifndef MODULE
1862 static int __init apm_setup(char *str)
1863 {
1864  int invert;
1865 
1866  while ((str != NULL) && (*str != '\0')) {
1867  if (strncmp(str, "off", 3) == 0)
1868  apm_disabled = 1;
1869  if (strncmp(str, "on", 2) == 0)
1870  apm_disabled = 0;
1871  if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1872  (strncmp(str, "bounce_interval=", 16) == 0))
1873  bounce_interval = simple_strtol(str + 16, NULL, 0);
1874  if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1875  (strncmp(str, "idle_threshold=", 15) == 0))
1876  idle_threshold = simple_strtol(str + 15, NULL, 0);
1877  if ((strncmp(str, "idle-period=", 12) == 0) ||
1878  (strncmp(str, "idle_period=", 12) == 0))
1879  idle_period = simple_strtol(str + 12, NULL, 0);
1880  invert = (strncmp(str, "no-", 3) == 0) ||
1881  (strncmp(str, "no_", 3) == 0);
1882  if (invert)
1883  str += 3;
1884  if (strncmp(str, "debug", 5) == 0)
1885  debug = !invert;
1886  if ((strncmp(str, "power-off", 9) == 0) ||
1887  (strncmp(str, "power_off", 9) == 0))
1888  power_off = !invert;
1889  if (strncmp(str, "smp", 3) == 0) {
1890  smp = !invert;
1891  idle_threshold = 100;
1892  }
1893  if ((strncmp(str, "allow-ints", 10) == 0) ||
1894  (strncmp(str, "allow_ints", 10) == 0))
1895  apm_info.allow_ints = !invert;
1896  if ((strncmp(str, "broken-psr", 10) == 0) ||
1897  (strncmp(str, "broken_psr", 10) == 0))
1898  apm_info.get_power_status_broken = !invert;
1899  if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1900  (strncmp(str, "realmode_power_off", 18) == 0))
1901  apm_info.realmode_power_off = !invert;
1902  str = strchr(str, ',');
1903  if (str != NULL)
1904  str += strspn(str, ", \t");
1905  }
1906  return 1;
1907 }
1908 
1909 __setup("apm=", apm_setup);
1910 #endif
1911 
1912 static const struct file_operations apm_bios_fops = {
1913  .owner = THIS_MODULE,
1914  .read = do_read,
1915  .poll = do_poll,
1916  .unlocked_ioctl = do_ioctl,
1917  .open = do_open,
1918  .release = do_release,
1919  .llseek = noop_llseek,
1920 };
1921 
1922 static struct miscdevice apm_device = {
1923  APM_MINOR_DEV,
1924  "apm_bios",
1925  &apm_bios_fops
1926 };
1927 
1928 
1929 /* Simple "print if true" callback */
1930 static int __init print_if_true(const struct dmi_system_id *d)
1931 {
1932  printk("%s\n", d->ident);
1933  return 0;
1934 }
1935 
1936 /*
1937  * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1938  * disabled before the suspend. Linux used to get terribly confused by that.
1939  */
1940 static int __init broken_ps2_resume(const struct dmi_system_id *d)
1941 {
1942  printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1943  "workaround hopefully not needed.\n", d->ident);
1944  return 0;
1945 }
1946 
1947 /* Some bioses have a broken protected mode poweroff and need to use realmode */
1948 static int __init set_realmode_power_off(const struct dmi_system_id *d)
1949 {
1950  if (apm_info.realmode_power_off == 0) {
1951  apm_info.realmode_power_off = 1;
1952  printk(KERN_INFO "%s bios detected. "
1953  "Using realmode poweroff only.\n", d->ident);
1954  }
1955  return 0;
1956 }
1957 
1958 /* Some laptops require interrupts to be enabled during APM calls */
1959 static int __init set_apm_ints(const struct dmi_system_id *d)
1960 {
1961  if (apm_info.allow_ints == 0) {
1962  apm_info.allow_ints = 1;
1963  printk(KERN_INFO "%s machine detected. "
1964  "Enabling interrupts during APM calls.\n", d->ident);
1965  }
1966  return 0;
1967 }
1968 
1969 /* Some APM bioses corrupt memory or just plain do not work */
1970 static int __init apm_is_horked(const struct dmi_system_id *d)
1971 {
1972  if (apm_info.disabled == 0) {
1973  apm_info.disabled = 1;
1974  printk(KERN_INFO "%s machine detected. "
1975  "Disabling APM.\n", d->ident);
1976  }
1977  return 0;
1978 }
1979 
1980 static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1981 {
1982  if (apm_info.disabled == 0) {
1983  apm_info.disabled = 1;
1984  printk(KERN_INFO "%s machine detected. "
1985  "Disabling APM.\n", d->ident);
1986  printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
1987  printk(KERN_INFO "download from support.intel.com\n");
1988  }
1989  return 0;
1990 }
1991 
1992 /* Some APM bioses hang on APM idle calls */
1993 static int __init apm_likes_to_melt(const struct dmi_system_id *d)
1994 {
1995  if (apm_info.forbid_idle == 0) {
1996  apm_info.forbid_idle = 1;
1997  printk(KERN_INFO "%s machine detected. "
1998  "Disabling APM idle calls.\n", d->ident);
1999  }
2000  return 0;
2001 }
2002 
2003 /*
2004  * Check for clue free BIOS implementations who use
2005  * the following QA technique
2006  *
2007  * [ Write BIOS Code ]<------
2008  * | ^
2009  * < Does it Compile >----N--
2010  * |Y ^
2011  * < Does it Boot Win98 >-N--
2012  * |Y
2013  * [Ship It]
2014  *
2015  * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e)
2016  * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000)
2017  */
2018 static int __init broken_apm_power(const struct dmi_system_id *d)
2019 {
2020  apm_info.get_power_status_broken = 1;
2021  printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2022  "disabling power status reporting.\n");
2023  return 0;
2024 }
2025 
2026 /*
2027  * This bios swaps the APM minute reporting bytes over (Many sony laptops
2028  * have this problem).
2029  */
2030 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2031 {
2032  apm_info.get_power_status_swabinminutes = 1;
2033  printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2034  "in minutes and wrong byte order.\n");
2035  return 0;
2036 }
2037 
2038 static struct dmi_system_id __initdata apm_dmi_table[] = {
2039  {
2040  print_if_true,
2041  KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2042  { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2043  DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2044  },
2045  { /* Handle problems with APM on the C600 */
2046  broken_ps2_resume, "Dell Latitude C600",
2047  { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2048  DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2049  },
2050  { /* Allow interrupts during suspend on Dell Latitude laptops*/
2051  set_apm_ints, "Dell Latitude",
2052  { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2053  DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2054  },
2055  { /* APM crashes */
2056  apm_is_horked, "Dell Inspiron 2500",
2057  { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2058  DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2059  DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2060  DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2061  },
2062  { /* Allow interrupts during suspend on Dell Inspiron laptops*/
2063  set_apm_ints, "Dell Inspiron", {
2064  DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2065  DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2066  },
2067  { /* Handle problems with APM on Inspiron 5000e */
2068  broken_apm_power, "Dell Inspiron 5000e",
2069  { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2070  DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2071  DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2072  },
2073  { /* Handle problems with APM on Inspiron 2500 */
2074  broken_apm_power, "Dell Inspiron 2500",
2075  { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2076  DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2077  DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2078  },
2079  { /* APM crashes */
2080  apm_is_horked, "Dell Dimension 4100",
2081  { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2082  DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2083  DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2084  DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2085  },
2086  { /* Allow interrupts during suspend on Compaq Laptops*/
2087  set_apm_ints, "Compaq 12XL125",
2088  { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2089  DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2090  DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2091  DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2092  },
2093  { /* Allow interrupts during APM or the clock goes slow */
2094  set_apm_ints, "ASUSTeK",
2095  { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2096  DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2097  },
2098  { /* APM blows on shutdown */
2099  apm_is_horked, "ABIT KX7-333[R]",
2100  { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2101  DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2102  },
2103  { /* APM crashes */
2104  apm_is_horked, "Trigem Delhi3",
2105  { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2106  DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2107  },
2108  { /* APM crashes */
2109  apm_is_horked, "Fujitsu-Siemens",
2110  { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2111  DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2112  },
2113  { /* APM crashes */
2114  apm_is_horked_d850md, "Intel D850MD",
2115  { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2116  DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2117  },
2118  { /* APM crashes */
2119  apm_is_horked, "Intel D810EMO",
2120  { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2121  DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2122  },
2123  { /* APM crashes */
2124  apm_is_horked, "Dell XPS-Z",
2125  { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2126  DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2127  DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2128  },
2129  { /* APM crashes */
2130  apm_is_horked, "Sharp PC-PJ/AX",
2131  { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2132  DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2133  DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2134  DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2135  },
2136  { /* APM crashes */
2137  apm_is_horked, "Dell Inspiron 2500",
2138  { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2139  DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2140  DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2141  DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2142  },
2143  { /* APM idle hangs */
2144  apm_likes_to_melt, "Jabil AMD",
2145  { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2146  DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2147  },
2148  { /* APM idle hangs */
2149  apm_likes_to_melt, "AMI Bios",
2150  { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2151  DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2152  },
2153  { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2154  swab_apm_power_in_minutes, "Sony VAIO",
2155  { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2156  DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2157  DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2158  },
2159  { /* Handle problems with APM on Sony Vaio PCG-N505VX */
2160  swab_apm_power_in_minutes, "Sony VAIO",
2161  { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2162  DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2163  DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2164  },
2165  { /* Handle problems with APM on Sony Vaio PCG-XG29 */
2166  swab_apm_power_in_minutes, "Sony VAIO",
2167  { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2168  DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2169  DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2170  },
2171  { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2172  swab_apm_power_in_minutes, "Sony VAIO",
2173  { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2174  DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2175  DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2176  },
2177  { /* Handle problems with APM on Sony Vaio PCG-Z600NE */
2178  swab_apm_power_in_minutes, "Sony VAIO",
2179  { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2180  DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2181  DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2182  },
2183  { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2184  swab_apm_power_in_minutes, "Sony VAIO",
2185  { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2186  DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2187  DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2188  },
2189  { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2190  swab_apm_power_in_minutes, "Sony VAIO",
2191  { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2192  DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2193  DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2194  },
2195  { /* Handle problems with APM on Sony Vaio PCG-Z505LS */
2196  swab_apm_power_in_minutes, "Sony VAIO",
2197  { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2198  DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2199  DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2200  },
2201  { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2202  swab_apm_power_in_minutes, "Sony VAIO",
2203  { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2204  DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2205  DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2206  },
2207  { /* Handle problems with APM on Sony Vaio PCG-F104K */
2208  swab_apm_power_in_minutes, "Sony VAIO",
2209  { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2210  DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2211  DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2212  },
2213 
2214  { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2215  swab_apm_power_in_minutes, "Sony VAIO",
2216  { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2217  DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2218  DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2219  },
2220  { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2221  swab_apm_power_in_minutes, "Sony VAIO",
2222  { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2223  DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2224  DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2225  },
2226  { /* Handle problems with APM on Sony Vaio PCG-C1VE */
2227  swab_apm_power_in_minutes, "Sony VAIO",
2228  { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2229  DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2230  DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2231  },
2232  { /* broken PM poweroff bios */
2233  set_realmode_power_off, "Award Software v4.60 PGMA",
2234  { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2235  DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2236  DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2237  },
2238 
2239  /* Generic per vendor APM settings */
2240 
2241  { /* Allow interrupts during suspend on IBM laptops */
2242  set_apm_ints, "IBM",
2243  { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2244  },
2245 
2246  { }
2247 };
2248 
2249 /*
2250  * Just start the APM thread. We do NOT want to do APM BIOS
2251  * calls from anything but the APM thread, if for no other reason
2252  * than the fact that we don't trust the APM BIOS. This way,
2253  * most common APM BIOS problems that lead to protection errors
2254  * etc will have at least some level of being contained...
2255  *
2256  * In short, if something bad happens, at least we have a choice
2257  * of just killing the apm thread..
2258  */
2259 static int __init apm_init(void)
2260 {
2261  struct desc_struct *gdt;
2262  int err;
2263 
2264  dmi_check_system(apm_dmi_table);
2265 
2266  if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) {
2267  printk(KERN_INFO "apm: BIOS not found.\n");
2268  return -ENODEV;
2269  }
2270  printk(KERN_INFO
2271  "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2272  ((apm_info.bios.version >> 8) & 0xff),
2273  (apm_info.bios.version & 0xff),
2274  apm_info.bios.flags,
2275  driver_version);
2276  if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2277  printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2278  return -ENODEV;
2279  }
2280 
2281  if (allow_ints)
2282  apm_info.allow_ints = 1;
2283  if (broken_psr)
2284  apm_info.get_power_status_broken = 1;
2285  if (realmode_power_off)
2286  apm_info.realmode_power_off = 1;
2287  /* User can override, but default is to trust DMI */
2288  if (apm_disabled != -1)
2289  apm_info.disabled = apm_disabled;
2290 
2291  /*
2292  * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2293  * but is reportedly a 1.0 BIOS.
2294  */
2295  if (apm_info.bios.version == 0x001)
2296  apm_info.bios.version = 0x100;
2297 
2298  /* BIOS < 1.2 doesn't set cseg_16_len */
2299  if (apm_info.bios.version < 0x102)
2300  apm_info.bios.cseg_16_len = 0; /* 64k */
2301 
2302  if (debug) {
2303  printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2304  apm_info.bios.cseg, apm_info.bios.offset,
2305  apm_info.bios.cseg_16, apm_info.bios.dseg);
2306  if (apm_info.bios.version > 0x100)
2307  printk(" cseg len %x, dseg len %x",
2308  apm_info.bios.cseg_len,
2309  apm_info.bios.dseg_len);
2310  if (apm_info.bios.version > 0x101)
2311  printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2312  printk("\n");
2313  }
2314 
2315  if (apm_info.disabled) {
2316  pr_notice("disabled on user request.\n");
2317  return -ENODEV;
2318  }
2319  if ((num_online_cpus() > 1) && !power_off && !smp) {
2320  pr_notice("disabled - APM is not SMP safe.\n");
2321  apm_info.disabled = 1;
2322  return -ENODEV;
2323  }
2324  if (!acpi_disabled) {
2325  pr_notice("overridden by ACPI.\n");
2326  apm_info.disabled = 1;
2327  return -ENODEV;
2328  }
2329 
2330  /*
2331  * Set up the long jump entry point to the APM BIOS, which is called
2332  * from inline assembly.
2333  */
2334  apm_bios_entry.offset = apm_info.bios.offset;
2335  apm_bios_entry.segment = APM_CS;
2336 
2337  /*
2338  * The APM 1.1 BIOS is supposed to provide limit information that it
2339  * recognizes. Many machines do this correctly, but many others do
2340  * not restrict themselves to their claimed limit. When this happens,
2341  * they will cause a segmentation violation in the kernel at boot time.
2342  * Most BIOS's, however, will respect a 64k limit, so we use that.
2343  *
2344  * Note we only set APM segments on CPU zero, since we pin the APM
2345  * code to that CPU.
2346  */
2347  gdt = get_cpu_gdt_table(0);
2348  set_desc_base(&gdt[APM_CS >> 3],
2349  (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2350  set_desc_base(&gdt[APM_CS_16 >> 3],
2351  (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2352  set_desc_base(&gdt[APM_DS >> 3],
2353  (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2354 
2355  proc_create("apm", 0, NULL, &apm_file_ops);
2356 
2357  kapmd_task = kthread_create(apm, NULL, "kapmd");
2358  if (IS_ERR(kapmd_task)) {
2359  pr_err("disabled - Unable to start kernel thread\n");
2360  err = PTR_ERR(kapmd_task);
2361  kapmd_task = NULL;
2362  remove_proc_entry("apm", NULL);
2363  return err;
2364  }
2365  wake_up_process(kapmd_task);
2366 
2367  if (num_online_cpus() > 1 && !smp) {
2368  printk(KERN_NOTICE
2369  "apm: disabled - APM is not SMP safe (power off active).\n");
2370  return 0;
2371  }
2372 
2373  /*
2374  * Note we don't actually care if the misc_device cannot be registered.
2375  * this driver can do its job without it, even if userspace can't
2376  * control it. just log the error
2377  */
2378  if (misc_register(&apm_device))
2379  printk(KERN_WARNING "apm: Could not register misc device.\n");
2380 
2381  if (HZ != 100)
2382  idle_period = (idle_period * HZ) / 100;
2383  if (idle_threshold < 100) {
2384  original_pm_idle = pm_idle;
2385  pm_idle = apm_cpu_idle;
2386  set_pm_idle = 1;
2387  }
2388 
2389  return 0;
2390 }
2391 
2392 static void __exit apm_exit(void)
2393 {
2394  int error;
2395 
2396  if (set_pm_idle) {
2397  pm_idle = original_pm_idle;
2398  /*
2399  * We are about to unload the current idle thread pm callback
2400  * (pm_idle), Wait for all processors to update cached/local
2401  * copies of pm_idle before proceeding.
2402  */
2403  kick_all_cpus_sync();
2404  }
2405  if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2406  && (apm_info.connection_version > 0x0100)) {
2407  error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2408  if (error)
2409  apm_error("disengage power management", error);
2410  }
2411  misc_deregister(&apm_device);
2412  remove_proc_entry("apm", NULL);
2413  if (power_off)
2414  pm_power_off = NULL;
2415  if (kapmd_task) {
2416  kthread_stop(kapmd_task);
2417  kapmd_task = NULL;
2418  }
2419 }
2420 
2421 module_init(apm_init);
2422 module_exit(apm_exit);
2423 
2424 MODULE_AUTHOR("Stephen Rothwell");
2425 MODULE_DESCRIPTION("Advanced Power Management");
2426 MODULE_LICENSE("GPL");
2427 module_param(debug, bool, 0644);
2428 MODULE_PARM_DESC(debug, "Enable debug mode");
2429 module_param(power_off, bool, 0444);
2430 MODULE_PARM_DESC(power_off, "Enable power off");
2431 module_param(bounce_interval, int, 0444);
2432 MODULE_PARM_DESC(bounce_interval,
2433  "Set the number of ticks to ignore suspend bounces");
2434 module_param(allow_ints, bool, 0444);
2435 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2436 module_param(broken_psr, bool, 0444);
2437 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2438 module_param(realmode_power_off, bool, 0444);
2439 MODULE_PARM_DESC(realmode_power_off,
2440  "Switch to real mode before powering off");
2441 module_param(idle_threshold, int, 0444);
2442 MODULE_PARM_DESC(idle_threshold,
2443  "System idle percentage above which to make APM BIOS idle calls");
2444 module_param(idle_period, int, 0444);
2445 MODULE_PARM_DESC(idle_period,
2446  "Period (in sec/100) over which to caculate the idle percentage");
2447 module_param(smp, bool, 0444);
2448 MODULE_PARM_DESC(smp,
2449  "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2450 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
Generated on Thu Jan 10 2013 13:20:23 for Linux Kernel by   doxygen 1.8.2