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- Peter Anvin: more P4 configuration parsing
[davej-history.git] / arch / i386 / kernel / apm.c
blobdc47528cd1c763a07e8119b2145c7bb689f22fba
1 /* -*- linux-c -*-
2 * APM BIOS driver for Linux
3 * Copyright 1994-2000 Stephen Rothwell (sfr@linuxcare.com)
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 (Stephen.Rothwell@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 *
41 * History:
42 * 0.6b: first version in official kernel, Linux 1.3.46
43 * 0.7: changed /proc/apm format, Linux 1.3.58
44 * 0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59
45 * 0.9: only call bios if bios is present, Linux 1.3.72
46 * 1.0: use fixed device number, consolidate /proc/apm into this file,
47 * Linux 1.3.85
48 * 1.1: support user-space standby and suspend, power off after system
49 * halted, Linux 1.3.98
50 * 1.2: When resetting RTC after resume, take care so that the time
51 * is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
52 * <jtoth@princeton.edu>); improve interaction between
53 * screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
54 * 1.2a:Simple change to stop mysterious bug reports with SMP also added
55 * levels to the printk calls. APM is not defined for SMP machines.
56 * The new replacment for it is, but Linux doesn't yet support this.
57 * Alan Cox Linux 2.1.55
58 * 1.3: Set up a valid data descriptor 0x40 for buggy BIOS's
59 * 1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by
60 * Dean Gaudet <dgaudet@arctic.org>.
61 * C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87
62 * 1.5: Fix segment register reloading (in case of bad segments saved
63 * across BIOS call).
64 * Stephen Rothwell
65 * 1.6: Cope with complier/assembler differences.
66 * Only try to turn off the first display device.
67 * Fix OOPS at power off with no APM BIOS by Jan Echternach
68 * <echter@informatik.uni-rostock.de>
69 * Stephen Rothwell
70 * 1.7: Modify driver's cached copy of the disabled/disengaged flags
71 * to reflect current state of APM BIOS.
72 * Chris Rankin <rankinc@bellsouth.net>
73 * Reset interrupt 0 timer to 100Hz after suspend
74 * Chad Miller <cmiller@surfsouth.com>
75 * Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
76 * Richard Gooch <rgooch@atnf.csiro.au>
77 * Allow boot time disabling of APM
78 * Make boot messages far less verbose by default
79 * Make asm safer
80 * Stephen Rothwell
81 * 1.8: Add CONFIG_APM_RTC_IS_GMT
82 * Richard Gooch <rgooch@atnf.csiro.au>
83 * change APM_NOINTS to CONFIG_APM_ALLOW_INTS
84 * remove dependency on CONFIG_PROC_FS
85 * Stephen Rothwell
86 * 1.9: Fix small typo. <laslo@ilo.opole.pl>
87 * Try to cope with BIOS's that need to have all display
88 * devices blanked and not just the first one.
89 * Ross Paterson <ross@soi.city.ac.uk>
90 * Fix segment limit setting it has always been wrong as
91 * the segments needed to have byte granularity.
92 * Mark a few things __init.
93 * Add hack to allow power off of SMP systems by popular request.
94 * Use CONFIG_SMP instead of __SMP__
95 * Ignore BOUNCES for three seconds.
96 * Stephen Rothwell
97 * 1.10: Fix for Thinkpad return code.
98 * Merge 2.2 and 2.3 drivers.
99 * Remove APM dependencies in arch/i386/kernel/process.c
100 * Remove APM dependencies in drivers/char/sysrq.c
101 * Reset time across standby.
102 * Allow more inititialisation on SMP.
103 * Remove CONFIG_APM_POWER_OFF and make it boot time
104 * configurable (default on).
105 * Make debug only a boot time parameter (remove APM_DEBUG).
106 * Try to blank all devices on any error.
107 * 1.11: Remove APM dependencies in drivers/char/console.c
108 * Check nr_running to detect if we are idle (from
109 * Borislav Deianov <borislav@lix.polytechnique.fr>)
110 * Fix for bioses that don't zero the top part of the
111 * entrypoint offset (Mario Sitta <sitta@al.unipmn.it>)
112 * (reported by Panos Katsaloulis <teras@writeme.com>).
113 * Real mode power off patch (Walter Hofmann
114 * <Walter.Hofmann@physik.stud.uni-erlangen.de>).
115 * 1.12: Remove CONFIG_SMP as the compiler will optimize
116 * the code away anyway (smp_num_cpus == 1 in UP)
117 * noted by Artur Skawina <skawina@geocities.com>.
118 * Make power off under SMP work again.
119 * Fix thinko with initial engaging of BIOS.
120 * Make sure power off only happens on CPU 0
121 * (Paul "Rusty" Russell <rusty@linuxcare.com>).
122 * Do error notification to user mode if BIOS calls fail.
123 * Move entrypoint offset fix to ...boot/setup.S
124 * where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>).
125 * Remove smp-power-off. SMP users must now specify
126 * "apm=power-off" on the kernel command line. Suggested
127 * by Jim Avera <jima@hal.com>, modified by Alan Cox
128 * <alan@lxorguk.ukuu.org.uk>.
129 * Register the /proc/apm entry even on SMP so that
130 * scripts that check for it before doing power off
131 * work (Jim Avera <jima@hal.com>).
132 * 1.13: Changes for new pm_ interfaces (Andy Henroid
133 * <andy_henroid@yahoo.com>).
134 * Modularize the code.
135 * Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS
136 * is now the way life works).
137 * Fix thinko in suspend() (wrong return).
138 * Notify drivers on critical suspend.
139 * Make kapmd absorb more idle time (Pavel Machek <pavel@suse.cz>
140 * modified by sfr).
141 * Disable interrupts while we are suspended (Andy Henroid
142 * <andy_henroid@yahoo.com> fixed by sfr).
143 * Make power off work on SMP again (Tony Hoyle
144 * <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr.
145 * Remove CONFIG_APM_SUSPEND_BOUNCE. The bounce ignore
146 * interval is now configurable.
147 *
148 * APM 1.1 Reference:
149 *
150 * Intel Corporation, Microsoft Corporation. Advanced Power Management
151 * (APM) BIOS Interface Specification, Revision 1.1, September 1993.
152 * Intel Order Number 241704-001. Microsoft Part Number 781-110-X01.
153 *
154 * [This document is available free from Intel by calling 800.628.8686 (fax
155 * 916.356.6100) or 800.548.4725; or via anonymous ftp from
156 * ftp://ftp.intel.com/pub/IAL/software_specs/apmv11.doc. It is also
157 * available from Microsoft by calling 206.882.8080.]
158 *
159 * APM 1.2 Reference:
160 * Intel Corporation, Microsoft Corporation. Advanced Power Management
161 * (APM) BIOS Interface Specification, Revision 1.2, February 1996.
162 *
163 * [This document is available from Microsoft at:
164 * http://www.microsoft.com/hwdev/busbios/amp_12.htm]
165 */
166
167 #include <linux/config.h>
168 #include <linux/module.h>
169
170 #include <linux/poll.h>
171 #include <linux/types.h>
172 #include <linux/stddef.h>
173 #include <linux/timer.h>
174 #include <linux/fcntl.h>
175 #include <linux/malloc.h>
176 #include <linux/stat.h>
177 #include <linux/proc_fs.h>
178 #include <linux/miscdevice.h>
179 #include <linux/apm_bios.h>
180 #include <linux/init.h>
181 #include <linux/sched.h>
182 #include <linux/pm.h>
183 #include <linux/kernel.h>
184 #include <linux/smp_lock.h>
185
186 #include <asm/system.h>
187 #include <asm/uaccess.h>
188 #include <asm/desc.h>
189
190 extern unsigned long get_cmos_time(void);
191 extern void machine_real_restart(unsigned char *, int);
192
193 #ifdef CONFIG_MAGIC_SYSRQ
194 extern void (*sysrq_power_off)(void);
195 #endif
196 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
197 extern int (*console_blank_hook)(int);
198 #endif
199
200 /*
201 * The apm_bios device is one of the misc char devices.
202 * This is its minor number.
203 */
204 #define APM_MINOR_DEV 134
205
206 /*
207 * See Documentation/Config.help for the configuration options.
208 *
209 * Various options can be changed at boot time as follows:
210 * (We allow underscores for compatibility with the modules code)
211 * apm=on/off enable/disable APM
212 * [no-]debug log some debugging messages
213 * [no-]power[-_]off power off on shutdown
214 */
215
216 /* KNOWN PROBLEM MACHINES:
217 *
218 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
219 * [Confirmed by TI representative]
220 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
221 * [Confirmed by BIOS disassembly]
222 * [This may work now ...]
223 * P: Toshiba 1950S: battery life information only gets updated after resume
224 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
225 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
226 *
227 * Legend: U = unusable with APM patches
228 * P = partially usable with APM patches
229 */
230
231 /*
232 * Define to always call the APM BIOS busy routine even if the clock was
233 * not slowed by the idle routine.
234 */
235 #define ALWAYS_CALL_BUSY
236
237 /*
238 * Define to make the APM BIOS calls zero all data segment registers (so
239 * that an incorrect BIOS implementation will cause a kernel panic if it
240 * tries to write to arbitrary memory).
241 */
242 #define APM_ZERO_SEGS
243
244 /*
245 * Define to make all _set_limit calls use 64k limits. The APM 1.1 BIOS is
246 * supposed to provide limit information that it recognizes. Many machines
247 * do this correctly, but many others do not restrict themselves to their
248 * claimed limit. When this happens, they will cause a segmentation
249 * violation in the kernel at boot time. Most BIOS's, however, will
250 * respect a 64k limit, so we use that. If you want to be pedantic and
251 * hold your BIOS to its claims, then undefine this.
252 */
253 #define APM_RELAX_SEGMENTS
254
255 /*
256 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
257 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
258 * David Chen <chen@ctpa04.mit.edu>
259 */
260 #undef INIT_TIMER_AFTER_SUSPEND
261
262 #ifdef INIT_TIMER_AFTER_SUSPEND
263 #include <linux/timex.h>
264 #include <asm/io.h>
265 #include <linux/delay.h>
266 #endif
267
268 /*
269 * Need to poll the APM BIOS every second
270 */
271 #define APM_CHECK_TIMEOUT (HZ)
272
273 /*
274 * Ignore suspend events for this amount of time after a resume
275 */
276 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
277
278 /*
279 * Save a segment register away
280 */
281 #define savesegment(seg, where) \
282 __asm__ __volatile__("movl %%" #seg ",%0" : "=m" (where))
283
284 /*
285 * Maximum number of events stored
286 */
287 #define APM_MAX_EVENTS 20
288
289 /*
290 * The per-file APM data
291 */
292 struct apm_user {
293 int magic;
294 struct apm_user * next;
295 int suser: 1;
296 int suspend_wait: 1;
297 int suspend_result;
298 int suspends_pending;
299 int standbys_pending;
300 int suspends_read;
301 int standbys_read;
302 int event_head;
303 int event_tail;
304 apm_event_t events[APM_MAX_EVENTS];
305 };
306
307 /*
308 * The magic number in apm_user
309 */
310 #define APM_BIOS_MAGIC 0x4101
311
312 /*
313 * Local variables
314 */
315 static struct {
316 unsigned long offset;
317 unsigned short segment;
318 } apm_bios_entry;
319 #ifdef CONFIG_APM_CPU_IDLE
320 static int clock_slowed;
321 #endif
322 static int suspends_pending;
323 static int standbys_pending;
324 static int waiting_for_resume;
325 static int ignore_normal_resume;
326 static int bounce_interval = DEFAULT_BOUNCE_INTERVAL;
327
328 #ifdef CONFIG_APM_RTC_IS_GMT
329 # define clock_cmos_diff 0
330 # define got_clock_diff 1
331 #else
332 static long clock_cmos_diff;
333 static int got_clock_diff;
334 #endif
335 static int debug;
336 static int apm_disabled;
337 #ifdef CONFIG_SMP
338 static int power_off;
339 #else
340 static int power_off = 1;
341 #endif
342 static int exit_kapmd;
343 static int kapmd_running;
344
345 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
346 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
347 static struct apm_user * user_list = NULL;
348
349 static char driver_version[] = "1.13"; /* no spaces */
350
351 static char * apm_event_name[] = {
352 "system standby",
353 "system suspend",
354 "normal resume",
355 "critical resume",
356 "low battery",
357 "power status change",
358 "update time",
359 "critical suspend",
360 "user standby",
361 "user suspend",
362 "system standby resume",
363 "capabilities change"
364 };
365 #define NR_APM_EVENT_NAME \
366 (sizeof(apm_event_name) / sizeof(apm_event_name[0]))
367
368 typedef struct lookup_t {
369 int key;
370 char * msg;
371 } lookup_t;
372
373 static const lookup_t error_table[] = {
374 /* N/A { APM_SUCCESS, "Operation succeeded" }, */
375 { APM_DISABLED, "Power management disabled" },
376 { APM_CONNECTED, "Real mode interface already connected" },
377 { APM_NOT_CONNECTED, "Interface not connected" },
378 { APM_16_CONNECTED, "16 bit interface already connected" },
379 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
380 { APM_32_CONNECTED, "32 bit interface already connected" },
381 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
382 { APM_BAD_DEVICE, "Unrecognized device ID" },
383 { APM_BAD_PARAM, "Parameter out of range" },
384 { APM_NOT_ENGAGED, "Interface not engaged" },
385 { APM_BAD_FUNCTION, "Function not supported" },
386 { APM_RESUME_DISABLED, "Resume timer disabled" },
387 { APM_BAD_STATE, "Unable to enter requested state" },
388 /* N/A { APM_NO_EVENTS, "No events pending" }, */
389 { APM_NO_ERROR, "BIOS did not set a return code" },
390 { APM_NOT_PRESENT, "No APM present" }
391 };
392 #define ERROR_COUNT (sizeof(error_table)/sizeof(lookup_t))
393
394 /*
395 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
396 * CONFIG_APM_ALLOW_INTS, we are being really paranoid here! Not only
397 * are interrupts disabled, but all the segment registers (except SS)
398 * are saved and zeroed this means that if the BIOS tries to reference
399 * any data without explicitly loading the segment registers, the kernel
400 * will fault immediately rather than have some unforeseen circumstances
401 * for the rest of the kernel. And it will be very obvious! :-) Doing
402 * this depends on CS referring to the same physical memory as DS so that
403 * DS can be zeroed before the call. Unfortunately, we can't do anything
404 * about the stack segment/pointer. Also, we tell the compiler that
405 * everything could change.
406 *
407 * Also, we KNOW that for the non error case of apm_bios_call, there
408 * is no useful data returned in the low order 8 bits of eax.
409 */
410 #ifndef CONFIG_APM_ALLOW_INTS
411 # define APM_DO_CLI __cli()
412 #else
413 # define APM_DO_CLI __sti()
414 #endif
415 #ifdef APM_ZERO_SEGS
416 # define APM_DECL_SEGS \
417 unsigned int saved_fs; unsigned int saved_gs;
418 # define APM_DO_SAVE_SEGS \
419 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
420 # define APM_DO_ZERO_SEGS \
421 "pushl %%ds\n\t" \
422 "pushl %%es\n\t" \
423 "xorl %%edx, %%edx\n\t" \
424 "mov %%dx, %%ds\n\t" \
425 "mov %%dx, %%es\n\t" \
426 "mov %%dx, %%fs\n\t" \
427 "mov %%dx, %%gs\n\t"
428 # define APM_DO_POP_SEGS \
429 "popl %%es\n\t" \
430 "popl %%ds\n\t"
431 # define APM_DO_RESTORE_SEGS \
432 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
433 #else
434 # define APM_DECL_SEGS
435 # define APM_DO_SAVE_SEGS
436 # define APM_DO_ZERO_SEGS
437 # define APM_DO_POP_SEGS
438 # define APM_DO_RESTORE_SEGS
439 #endif
440
441 static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in,
442 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi)
443 {
444 APM_DECL_SEGS
445 unsigned long flags;
446
447 __save_flags(flags);
448 APM_DO_CLI;
449 APM_DO_SAVE_SEGS;
450 /*
451 * N.B. We do NOT need a cld after the BIOS call
452 * because we always save and restore the flags.
453 */
454 __asm__ __volatile__(APM_DO_ZERO_SEGS
455 "pushl %%edi\n\t"
456 "pushl %%ebp\n\t"
457 "lcall %%cs:" SYMBOL_NAME_STR(apm_bios_entry) "\n\t"
458 "setc %%al\n\t"
459 "popl %%ebp\n\t"
460 "popl %%edi\n\t"
461 APM_DO_POP_SEGS
462 : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx),
463 "=S" (*esi)
464 : "a" (func), "b" (ebx_in), "c" (ecx_in)
465 : "memory", "cc");
466 APM_DO_RESTORE_SEGS;
467 __restore_flags(flags);
468 return *eax & 0xff;
469 }
470
471 /*
472 * This version only returns one value (usually an error code)
473 */
474
475 static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax)
476 {
477 u8 error;
478 APM_DECL_SEGS
479 unsigned long flags;
480
481 __save_flags(flags);
482 APM_DO_CLI;
483 APM_DO_SAVE_SEGS;
484 {
485 int cx, dx, si;
486
487 /*
488 * N.B. We do NOT need a cld after the BIOS call
489 * because we always save and restore the flags.
490 */
491 __asm__ __volatile__(APM_DO_ZERO_SEGS
492 "pushl %%edi\n\t"
493 "pushl %%ebp\n\t"
494 "lcall %%cs:" SYMBOL_NAME_STR(apm_bios_entry) "\n\t"
495 "setc %%bl\n\t"
496 "popl %%ebp\n\t"
497 "popl %%edi\n\t"
498 APM_DO_POP_SEGS
499 : "=a" (*eax), "=b" (error), "=c" (cx), "=d" (dx),
500 "=S" (si)
501 : "a" (func), "b" (ebx_in), "c" (ecx_in)
502 : "memory", "cc");
503 }
504 APM_DO_RESTORE_SEGS;
505 __restore_flags(flags);
506 return error;
507 }
508
509 static int __init apm_driver_version(u_short *val)
510 {
511 u32 eax;
512
513 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax))
514 return (eax >> 8) & 0xff;
515 *val = eax;
516 return APM_SUCCESS;
517 }
518
519 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
520 {
521 u32 eax;
522 u32 ebx;
523 u32 ecx;
524 u32 dummy;
525
526 if (apm_bios_call(APM_FUNC_GET_EVENT, 0, 0, &eax, &ebx, &ecx,
527 &dummy, &dummy))
528 return (eax >> 8) & 0xff;
529 *event = ebx;
530 if (apm_bios_info.version < 0x0102)
531 *info = ~0; /* indicate info not valid */
532 else
533 *info = ecx;
534 return APM_SUCCESS;
535 }
536
537 static int set_power_state(u_short what, u_short state)
538 {
539 u32 eax;
540
541 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax))
542 return (eax >> 8) & 0xff;
543 return APM_SUCCESS;
544 }
545
546 static int apm_set_power_state(u_short state)
547 {
548 return set_power_state(APM_DEVICE_ALL, state);
549 }
550
551 #ifdef CONFIG_APM_CPU_IDLE
552 static int apm_do_idle(void)
553 {
554 u32 dummy;
555
556 if (apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &dummy))
557 return 0;
558
559 #ifdef ALWAYS_CALL_BUSY
560 clock_slowed = 1;
561 #else
562 clock_slowed = (apm_bios_info.flags & APM_IDLE_SLOWS_CLOCK) != 0;
563 #endif
564 return 1;
565 }
566
567 static void apm_do_busy(void)
568 {
569 u32 dummy;
570
571 if (clock_slowed) {
572 (void) apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy);
573 clock_slowed = 0;
574 }
575 }
576
577 #if 0
578 extern int hlt_counter;
579
580 /*
581 * If no process has been interested in this
582 * CPU for some time, we want to wake up the
583 * power management thread - we probably want
584 * to conserve power.
585 */
586 #define HARD_IDLE_TIMEOUT (HZ/3)
587
588 /* This should wake up kapmd and ask it to slow the CPU */
589 #define powermanagement_idle() do { } while (0)
590
591 /*
592 * This is the idle thing.
593 */
594 static void apm_cpu_idle(void)
595 {
596 unsigned int start_idle;
597
598 start_idle = jiffies;
599 while (1) {
600 if (!current->need_resched) {
601 if (jiffies - start_idle < HARD_IDLE_TIMEOUT) {
602 if (!current_cpu_data.hlt_works_ok)
603 continue;
604 if (hlt_counter)
605 continue;
606 __cli();
607 if (!current->need_resched)
608 safe_halt();
609 else
610 __sti();
611 continue;
612 }
613
614 /*
615 * Ok, do some power management - we've been idle for too long
616 */
617 powermanagement_idle();
618 }
619
620 schedule();
621 check_pgt_cache();
622 start_idle = jiffies;
623 }
624 }
625 #endif
626 #endif
627
628 #ifdef CONFIG_SMP
629 static int apm_magic(void * unused)
630 {
631 while (1)
632 schedule();
633 }
634 #endif
635
636 static void apm_power_off(void)
637 {
638 #ifdef CONFIG_APM_REAL_MODE_POWER_OFF
639 unsigned char po_bios_call[] = {
640 0xb8, 0x00, 0x10, /* movw $0x1000,ax */
641 0x8e, 0xd0, /* movw ax,ss */
642 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
643 0xb8, 0x07, 0x53, /* movw $0x5307,ax */
644 0xbb, 0x01, 0x00, /* movw $0x0001,bx */
645 0xb9, 0x03, 0x00, /* movw $0x0003,cx */
646 0xcd, 0x15 /* int $0x15 */
647 };
648 #endif
649
650 /*
651 * This may be called on an SMP machine.
652 */
653 #ifdef CONFIG_SMP
654 /* Some bioses don't like being called from CPU != 0 */
655 while (cpu_number_map(smp_processor_id()) != 0) {
656 kernel_thread(apm_magic, NULL,
657 CLONE_FS | CLONE_FILES | CLONE_SIGHAND | SIGCHLD);
658 schedule();
659 }
660 #endif
661 #ifdef CONFIG_APM_REAL_MODE_POWER_OFF
662 machine_real_restart(po_bios_call, sizeof(po_bios_call));
663 #else
664 (void) apm_set_power_state(APM_STATE_OFF);
665 #endif
666 }
667
668 #ifdef CONFIG_APM_DO_ENABLE
669 static int apm_enable_power_management(int enable)
670 {
671 u32 eax;
672
673 if ((enable == 0) && (apm_bios_info.flags & APM_BIOS_DISENGAGED))
674 return APM_NOT_ENGAGED;
675 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
676 enable, &eax))
677 return (eax >> 8) & 0xff;
678 if (enable)
679 apm_bios_info.flags &= ~APM_BIOS_DISABLED;
680 else
681 apm_bios_info.flags |= APM_BIOS_DISABLED;
682 return APM_SUCCESS;
683 }
684 #endif
685
686 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
687 {
688 u32 eax;
689 u32 ebx;
690 u32 ecx;
691 u32 edx;
692 u32 dummy;
693
694 if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0,
695 &eax, &ebx, &ecx, &edx, &dummy))
696 return (eax >> 8) & 0xff;
697 *status = ebx;
698 *bat = ecx;
699 *life = edx;
700 return APM_SUCCESS;
701 }
702
703 #if 0
704 static int apm_get_battery_status(u_short which, u_short *status,
705 u_short *bat, u_short *life, u_short *nbat)
706 {
707 u32 eax;
708 u32 ebx;
709 u32 ecx;
710 u32 edx;
711 u32 esi;
712
713 if (apm_bios_info.version < 0x0102) {
714 /* pretend we only have one battery. */
715 if (which != 1)
716 return APM_BAD_DEVICE;
717 *nbat = 1;
718 return apm_get_power_status(status, bat, life);
719 }
720
721 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
722 &ebx, &ecx, &edx, &esi))
723 return (eax >> 8) & 0xff;
724 *status = ebx;
725 *bat = ecx;
726 *life = edx;
727 *nbat = esi;
728 return APM_SUCCESS;
729 }
730 #endif
731
732 static int apm_engage_power_management(u_short device, int enable)
733 {
734 u32 eax;
735
736 if ((enable == 0) && (device == APM_DEVICE_ALL)
737 && (apm_bios_info.flags & APM_BIOS_DISABLED))
738 return APM_DISABLED;
739 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax))
740 return (eax >> 8) & 0xff;
741 if (device == APM_DEVICE_ALL) {
742 if (enable)
743 apm_bios_info.flags &= ~APM_BIOS_DISENGAGED;
744 else
745 apm_bios_info.flags |= APM_BIOS_DISENGAGED;
746 }
747 return APM_SUCCESS;
748 }
749
750 static void apm_error(char *str, int err)
751 {
752 int i;
753
754 for (i = 0; i < ERROR_COUNT; i++)
755 if (error_table[i].key == err) break;
756 if (i < ERROR_COUNT)
757 printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
758 else
759 printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
760 str, err);
761 }
762
763 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
764 static int apm_console_blank(int blank)
765 {
766 int error;
767 u_short state;
768
769 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
770 /* Blank the first display device */
771 error = set_power_state(0x100, state);
772 if ((error != APM_SUCCESS) && (error != APM_NO_ERROR)) {
773 /* try to blank them all instead */
774 error = set_power_state(0x1ff, state);
775 if ((error != APM_SUCCESS) && (error != APM_NO_ERROR))
776 /* try to blank device one instead */
777 error = set_power_state(0x101, state);
778 }
779 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
780 return 1;
781 apm_error("set display", error);
782 return 0;
783 }
784 #endif
785
786 static int queue_empty(struct apm_user *as)
787 {
788 return as->event_head == as->event_tail;
789 }
790
791 static apm_event_t get_queued_event(struct apm_user *as)
792 {
793 as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
794 return as->events[as->event_tail];
795 }
796
797 static void queue_event(apm_event_t event, struct apm_user *sender)
798 {
799 struct apm_user * as;
800
801 if (user_list == NULL)
802 return;
803 for (as = user_list; as != NULL; as = as->next) {
804 if (as == sender)
805 continue;
806 as->event_head = (as->event_head + 1) % APM_MAX_EVENTS;
807 if (as->event_head == as->event_tail) {
808 static int notified;
809
810 if (notified++ == 0)
811 printk(KERN_ERR "apm: an event queue overflowed\n");
812 as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
813 }
814 as->events[as->event_head] = event;
815 if (!as->suser)
816 continue;
817 switch (event) {
818 case APM_SYS_SUSPEND:
819 case APM_USER_SUSPEND:
820 as->suspends_pending++;
821 suspends_pending++;
822 break;
823
824 case APM_SYS_STANDBY:
825 case APM_USER_STANDBY:
826 as->standbys_pending++;
827 standbys_pending++;
828 break;
829 }
830 }
831 wake_up_interruptible(&apm_waitqueue);
832 }
833
834 static void set_time(void)
835 {
836 unsigned long flags;
837
838 if (got_clock_diff) { /* Must know time zone in order to set clock */
839 save_flags(flags);
840 cli();
841 CURRENT_TIME = get_cmos_time() + clock_cmos_diff;
842 restore_flags(flags);
843 }
844 }
845
846 static void get_time_diff(void)
847 {
848 #ifndef CONFIG_APM_RTC_IS_GMT
849 unsigned long flags;
850
851 /*
852 * Estimate time zone so that set_time can update the clock
853 */
854 save_flags(flags);
855 clock_cmos_diff = -get_cmos_time();
856 cli();
857 clock_cmos_diff += CURRENT_TIME;
858 got_clock_diff = 1;
859 restore_flags(flags);
860 #endif
861 }
862
863 static void reinit_timer(void)
864 {
865 #ifdef INIT_TIMER_AFTER_SUSPEND
866 unsigned long flags;
867
868 save_flags(flags);
869 cli();
870 /* set the clock to 100 Hz */
871 outb_p(0x34,0x43); /* binary, mode 2, LSB/MSB, ch 0 */
872 udelay(10);
873 outb_p(LATCH & 0xff , 0x40); /* LSB */
874 udelay(10);
875 outb(LATCH >> 8 , 0x40); /* MSB */
876 udelay(10);
877 restore_flags(flags);
878 #endif
879 }
880
881 static int send_event(apm_event_t event)
882 {
883 switch (event) {
884 case APM_SYS_SUSPEND:
885 case APM_CRITICAL_SUSPEND:
886 case APM_USER_SUSPEND:
887 /* map all suspends to ACPI D3 */
888 if (pm_send_all(PM_SUSPEND, (void *)3)) {
889 if (event == APM_CRITICAL_SUSPEND) {
890 printk(KERN_CRIT "apm: Critical suspend was vetoed, expect armageddon\n" );
891 return 0;
892 }
893 if (apm_bios_info.version > 0x100)
894 apm_set_power_state(APM_STATE_REJECT);
895 return 0;
896 }
897 break;
898 case APM_NORMAL_RESUME:
899 case APM_CRITICAL_RESUME:
900 /* map all resumes to ACPI D0 */
901 (void) pm_send_all(PM_RESUME, (void *)0);
902 break;
903 }
904
905 return 1;
906 }
907
908 static int suspend(void)
909 {
910 int err;
911 struct apm_user *as;
912
913 get_time_diff();
914 cli();
915 err = apm_set_power_state(APM_STATE_SUSPEND);
916 reinit_timer();
917 set_time();
918 if (err == APM_NO_ERROR)
919 err = APM_SUCCESS;
920 if (err != APM_SUCCESS)
921 apm_error("suspend", err);
922 send_event(APM_NORMAL_RESUME);
923 sti();
924 queue_event(APM_NORMAL_RESUME, NULL);
925 for (as = user_list; as != NULL; as = as->next) {
926 as->suspend_wait = 0;
927 as->suspend_result = ((err == APM_SUCCESS) ? 0 : -EIO);
928 }
929 ignore_normal_resume = 1;
930 wake_up_interruptible(&apm_suspend_waitqueue);
931 return err;
932 }
933
934 static void standby(void)
935 {
936 int err;
937
938 get_time_diff();
939 err = apm_set_power_state(APM_STATE_STANDBY);
940 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
941 apm_error("standby", err);
942 }
943
944 static apm_event_t get_event(void)
945 {
946 int error;
947 apm_event_t event;
948 apm_eventinfo_t info;
949
950 static int notified;
951
952 /* we don't use the eventinfo */
953 error = apm_get_event(&event, &info);
954 if (error == APM_SUCCESS)
955 return event;
956
957 if ((error != APM_NO_EVENTS) && (notified++ == 0))
958 apm_error("get_event", error);
959
960 return 0;
961 }
962
963 static void check_events(void)
964 {
965 apm_event_t event;
966 static unsigned long last_resume;
967 static int ignore_bounce;
968
969 while ((event = get_event()) != 0) {
970 if (debug) {
971 if (event <= NR_APM_EVENT_NAME)
972 printk(KERN_DEBUG "apm: received %s notify\n",
973 apm_event_name[event - 1]);
974 else
975 printk(KERN_DEBUG "apm: received unknown "
976 "event 0x%02x\n", event);
977 }
978 if (ignore_bounce
979 && ((jiffies - last_resume) > bounce_interval))
980 ignore_bounce = 0;
981 if (ignore_normal_resume && (event != APM_NORMAL_RESUME))
982 ignore_normal_resume = 0;
983
984 switch (event) {
985 case APM_SYS_STANDBY:
986 case APM_USER_STANDBY:
987 if (send_event(event)) {
988 queue_event(event, NULL);
989 if (standbys_pending <= 0)
990 standby();
991 }
992 break;
993
994 case APM_USER_SUSPEND:
995 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
996 if (apm_bios_info.version > 0x100)
997 apm_set_power_state(APM_STATE_REJECT);
998 break;
999 #endif
1000 case APM_SYS_SUSPEND:
1001 if (ignore_bounce) {
1002 if (apm_bios_info.version > 0x100)
1003 apm_set_power_state(APM_STATE_REJECT);
1004 break;
1005 }
1006 /*
1007 * If we are already processing a SUSPEND,
1008 * then further SUSPEND events from the BIOS
1009 * will be ignored. We also return here to
1010 * cope with the fact that the Thinkpads keep
1011 * sending a SUSPEND event until something else
1012 * happens!
1013 */
1014 if (waiting_for_resume)
1015 return;
1016 if (send_event(event)) {
1017 queue_event(event, NULL);
1018 waiting_for_resume = 1;
1019 if (suspends_pending <= 0)
1020 (void) suspend();
1021 }
1022 break;
1023
1024 case APM_NORMAL_RESUME:
1025 case APM_CRITICAL_RESUME:
1026 case APM_STANDBY_RESUME:
1027 waiting_for_resume = 0;
1028 last_resume = jiffies;
1029 ignore_bounce = 1;
1030 if ((event != APM_NORMAL_RESUME)
1031 || (ignore_normal_resume == 0)) {
1032 set_time();
1033 send_event(event);
1034 queue_event(event, NULL);
1035 }
1036 break;
1037
1038 case APM_CAPABILITY_CHANGE:
1039 case APM_LOW_BATTERY:
1040 case APM_POWER_STATUS_CHANGE:
1041 send_event(event);
1042 queue_event(event, NULL);
1043 break;
1044
1045 case APM_UPDATE_TIME:
1046 set_time();
1047 break;
1048
1049 case APM_CRITICAL_SUSPEND:
1050 send_event(event);
1051 /*
1052 * We can only hope it worked - we are not allowed
1053 * to reject a critical suspend.
1054 */
1055 (void) suspend();
1056 break;
1057 }
1058 }
1059 }
1060
1061 static void apm_event_handler(void)
1062 {
1063 static int pending_count = 4;
1064 int err;
1065
1066 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1067 if ((apm_bios_info.version > 0x100) && (pending_count-- <= 0)) {
1068 pending_count = 4;
1069 if (debug)
1070 printk(KERN_DEBUG "apm: setting state busy\n");
1071 err = apm_set_power_state(APM_STATE_BUSY);
1072 if (err)
1073 apm_error("busy", err);
1074 }
1075 } else
1076 pending_count = 4;
1077 check_events();
1078 }
1079
1080 /*
1081 * This is the APM thread main loop.
1082 *
1083 * Check whether we're the only running process to
1084 * decide if we should just power down.
1085 *
1086 */
1087 #define system_idle() (nr_running == 1)
1088
1089 static void apm_mainloop(void)
1090 {
1091 int timeout = HZ;
1092 DECLARE_WAITQUEUE(wait, current);
1093
1094 add_wait_queue(&apm_waitqueue, &wait);
1095 set_current_state(TASK_INTERRUPTIBLE);
1096 for (;;) {
1097 /* Nothing to do, just sleep for the timeout */
1098 timeout = 2*timeout;
1099 if (timeout > APM_CHECK_TIMEOUT)
1100 timeout = APM_CHECK_TIMEOUT;
1101 schedule_timeout(timeout);
1102 if (exit_kapmd)
1103 break;
1104
1105 /*
1106 * Ok, check all events, check for idle (and mark us sleeping
1107 * so as not to count towards the load average)..
1108 */
1109 set_current_state(TASK_INTERRUPTIBLE);
1110 apm_event_handler();
1111 #ifdef CONFIG_APM_CPU_IDLE
1112 if (!system_idle())
1113 continue;
1114 if (apm_do_idle()) {
1115 unsigned long start = jiffies;
1116 while ((!exit_kapmd) && system_idle()) {
1117 apm_do_idle();
1118 if ((jiffies - start) > APM_CHECK_TIMEOUT) {
1119 apm_event_handler();
1120 start = jiffies;
1121 }
1122 }
1123 apm_do_busy();
1124 apm_event_handler();
1125 timeout = 1;
1126 }
1127 #endif
1128 }
1129 remove_wait_queue(&apm_waitqueue, &wait);
1130 }
1131
1132 static int check_apm_user(struct apm_user *as, const char *func)
1133 {
1134 if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) {
1135 printk(KERN_ERR "apm: %s passed bad filp\n", func);
1136 return 1;
1137 }
1138 return 0;
1139 }
1140
1141 static ssize_t do_read(struct file *fp, char *buf, size_t count, loff_t *ppos)
1142 {
1143 struct apm_user * as;
1144 int i;
1145 apm_event_t event;
1146 DECLARE_WAITQUEUE(wait, current);
1147
1148 as = fp->private_data;
1149 if (check_apm_user(as, "read"))
1150 return -EIO;
1151 if (count < sizeof(apm_event_t))
1152 return -EINVAL;
1153 if (queue_empty(as)) {
1154 if (fp->f_flags & O_NONBLOCK)
1155 return -EAGAIN;
1156 add_wait_queue(&apm_waitqueue, &wait);
1157 repeat:
1158 set_current_state(TASK_INTERRUPTIBLE);
1159 if (queue_empty(as) && !signal_pending(current)) {
1160 schedule();
1161 goto repeat;
1162 }
1163 set_current_state(TASK_RUNNING);
1164 remove_wait_queue(&apm_waitqueue, &wait);
1165 }
1166 i = count;
1167 while ((i >= sizeof(event)) && !queue_empty(as)) {
1168 event = get_queued_event(as);
1169 if (copy_to_user(buf, &event, sizeof(event))) {
1170 if (i < count)
1171 break;
1172 return -EFAULT;
1173 }
1174 switch (event) {
1175 case APM_SYS_SUSPEND:
1176 case APM_USER_SUSPEND:
1177 as->suspends_read++;
1178 break;
1179
1180 case APM_SYS_STANDBY:
1181 case APM_USER_STANDBY:
1182 as->standbys_read++;
1183 break;
1184 }
1185 buf += sizeof(event);
1186 i -= sizeof(event);
1187 }
1188 if (i < count)
1189 return count - i;
1190 if (signal_pending(current))
1191 return -ERESTARTSYS;
1192 return 0;
1193 }
1194
1195 static unsigned int do_poll(struct file *fp, poll_table * wait)
1196 {
1197 struct apm_user * as;
1198
1199 as = fp->private_data;
1200 if (check_apm_user(as, "poll"))
1201 return 0;
1202 poll_wait(fp, &apm_waitqueue, wait);
1203 if (!queue_empty(as))
1204 return POLLIN | POLLRDNORM;
1205 return 0;
1206 }
1207
1208 static int do_ioctl(struct inode * inode, struct file *filp,
1209 u_int cmd, u_long arg)
1210 {
1211 struct apm_user * as;
1212 DECLARE_WAITQUEUE(wait, current);
1213
1214 as = filp->private_data;
1215 if (check_apm_user(as, "ioctl"))
1216 return -EIO;
1217 if (!as->suser)
1218 return -EPERM;
1219 switch (cmd) {
1220 case APM_IOC_STANDBY:
1221 if (as->standbys_read > 0) {
1222 as->standbys_read--;
1223 as->standbys_pending--;
1224 standbys_pending--;
1225 } else if (!send_event(APM_USER_STANDBY))
1226 return -EAGAIN;
1227 else
1228 queue_event(APM_USER_STANDBY, as);
1229 if (standbys_pending <= 0)
1230 standby();
1231 break;
1232 case APM_IOC_SUSPEND:
1233 if (as->suspends_read > 0) {
1234 as->suspends_read--;
1235 as->suspends_pending--;
1236 suspends_pending--;
1237 } else if (!send_event(APM_USER_SUSPEND))
1238 return -EAGAIN;
1239 else
1240 queue_event(APM_USER_SUSPEND, as);
1241 if (suspends_pending <= 0) {
1242 if (suspend() != APM_SUCCESS)
1243 return -EIO;
1244 } else {
1245 as->suspend_wait = 1;
1246 add_wait_queue(&apm_suspend_waitqueue, &wait);
1247 while (1) {
1248 set_current_state(TASK_INTERRUPTIBLE);
1249 if ((as->suspend_wait == 0)
1250 || signal_pending(current))
1251 break;
1252 schedule();
1253 }
1254 set_current_state(TASK_RUNNING);
1255 remove_wait_queue(&apm_suspend_waitqueue, &wait);
1256 return as->suspend_result;
1257 }
1258 break;
1259 default:
1260 return -EINVAL;
1261 }
1262 return 0;
1263 }
1264
1265 static int do_release(struct inode * inode, struct file * filp)
1266 {
1267 struct apm_user * as;
1268
1269 as = filp->private_data;
1270 if (check_apm_user(as, "release"))
1271 return 0;
1272 filp->private_data = NULL;
1273 lock_kernel();
1274 if (as->standbys_pending > 0) {
1275 standbys_pending -= as->standbys_pending;
1276 if (standbys_pending <= 0)
1277 standby();
1278 }
1279 if (as->suspends_pending > 0) {
1280 suspends_pending -= as->suspends_pending;
1281 if (suspends_pending <= 0)
1282 (void) suspend();
1283 }
1284 if (user_list == as)
1285 user_list = as->next;
1286 else {
1287 struct apm_user * as1;
1288
1289 for (as1 = user_list;
1290 (as1 != NULL) && (as1->next != as);
1291 as1 = as1->next)
1292 ;
1293 if (as1 == NULL)
1294 printk(KERN_ERR "apm: filp not in user list\n");
1295 else
1296 as1->next = as->next;
1297 }
1298 unlock_kernel();
1299 kfree(as);
1300 return 0;
1301 }
1302
1303 static int do_open(struct inode * inode, struct file * filp)
1304 {
1305 struct apm_user * as;
1306
1307 as = (struct apm_user *)kmalloc(sizeof(*as), GFP_KERNEL);
1308 if (as == NULL) {
1309 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1310 sizeof(*as));
1311 return -ENOMEM;
1312 }
1313 as->magic = APM_BIOS_MAGIC;
1314 as->event_tail = as->event_head = 0;
1315 as->suspends_pending = as->standbys_pending = 0;
1316 as->suspends_read = as->standbys_read = 0;
1317 /*
1318 * XXX - this is a tiny bit broken, when we consider BSD
1319 * process accounting. If the device is opened by root, we
1320 * instantly flag that we used superuser privs. Who knows,
1321 * we might close the device immediately without doing a
1322 * privileged operation -- cevans
1323 */
1324 as->suser = capable(CAP_SYS_ADMIN);
1325 as->next = user_list;
1326 user_list = as;
1327 filp->private_data = as;
1328 return 0;
1329 }
1330
1331 static int apm_get_info(char *buf, char **start, off_t fpos, int length)
1332 {
1333 char * p;
1334 unsigned short bx;
1335 unsigned short cx;
1336 unsigned short dx;
1337 unsigned short error;
1338 unsigned short ac_line_status = 0xff;
1339 unsigned short battery_status = 0xff;
1340 unsigned short battery_flag = 0xff;
1341 int percentage = -1;
1342 int time_units = -1;
1343 char *units = "?";
1344
1345 p = buf;
1346
1347 if ((smp_num_cpus == 1) &&
1348 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1349 ac_line_status = (bx >> 8) & 0xff;
1350 battery_status = bx & 0xff;
1351 if ((cx & 0xff) != 0xff)
1352 percentage = cx & 0xff;
1353
1354 if (apm_bios_info.version > 0x100) {
1355 battery_flag = (cx >> 8) & 0xff;
1356 if (dx != 0xffff) {
1357 units = (dx & 0x8000) ? "min" : "sec";
1358 time_units = dx & 0x7fff;
1359 }
1360 }
1361 }
1362 /* Arguments, with symbols from linux/apm_bios.h. Information is
1363 from the Get Power Status (0x0a) call unless otherwise noted.
1364
1365 0) Linux driver version (this will change if format changes)
1366 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
1367 2) APM flags from APM Installation Check (0x00):
1368 bit 0: APM_16_BIT_SUPPORT
1369 bit 1: APM_32_BIT_SUPPORT
1370 bit 2: APM_IDLE_SLOWS_CLOCK
1371 bit 3: APM_BIOS_DISABLED
1372 bit 4: APM_BIOS_DISENGAGED
1373 3) AC line status
1374 0x00: Off-line
1375 0x01: On-line
1376 0x02: On backup power (BIOS >= 1.1 only)
1377 0xff: Unknown
1378 4) Battery status
1379 0x00: High
1380 0x01: Low
1381 0x02: Critical
1382 0x03: Charging
1383 0x04: Selected battery not present (BIOS >= 1.2 only)
1384 0xff: Unknown
1385 5) Battery flag
1386 bit 0: High
1387 bit 1: Low
1388 bit 2: Critical
1389 bit 3: Charging
1390 bit 7: No system battery
1391 0xff: Unknown
1392 6) Remaining battery life (percentage of charge):
1393 0-100: valid
1394 -1: Unknown
1395 7) Remaining battery life (time units):
1396 Number of remaining minutes or seconds
1397 -1: Unknown
1398 8) min = minutes; sec = seconds */
1399
1400 p += sprintf(p, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1401 driver_version,
1402 (apm_bios_info.version >> 8) & 0xff,
1403 apm_bios_info.version & 0xff,
1404 apm_bios_info.flags,
1405 ac_line_status,
1406 battery_status,
1407 battery_flag,
1408 percentage,
1409 time_units,
1410 units);
1411
1412 return p - buf;
1413 }
1414
1415 static int apm(void *unused)
1416 {
1417 unsigned short bx;
1418 unsigned short cx;
1419 unsigned short dx;
1420 unsigned short error;
1421 char * power_stat;
1422 char * bat_stat;
1423
1424 kapmd_running = 1;
1425
1426 daemonize();
1427
1428 strcpy(current->comm, "kapm-idled");
1429 sigfillset(&current->blocked);
1430 current->tty = NULL; /* get rid of controlling tty */
1431
1432 if (apm_bios_info.version > 0x100) {
1433 /*
1434 * We only support BIOSs up to version 1.2
1435 */
1436 if (apm_bios_info.version > 0x0102)
1437 apm_bios_info.version = 0x0102;
1438 if (apm_driver_version(&apm_bios_info.version) != APM_SUCCESS) {
1439 /* Fall back to an APM 1.0 connection. */
1440 apm_bios_info.version = 0x100;
1441 }
1442 }
1443 if (debug && (smp_num_cpus == 1)) {
1444 printk(KERN_INFO "apm: Connection version %d.%d\n",
1445 (apm_bios_info.version >> 8) & 0xff,
1446 apm_bios_info.version & 0xff);
1447
1448 error = apm_get_power_status(&bx, &cx, &dx);
1449 if (error)
1450 printk(KERN_INFO "apm: power status not available\n");
1451 else {
1452 switch ((bx >> 8) & 0xff) {
1453 case 0: power_stat = "off line"; break;
1454 case 1: power_stat = "on line"; break;
1455 case 2: power_stat = "on backup power"; break;
1456 default: power_stat = "unknown"; break;
1457 }
1458 switch (bx & 0xff) {
1459 case 0: bat_stat = "high"; break;
1460 case 1: bat_stat = "low"; break;
1461 case 2: bat_stat = "critical"; break;
1462 case 3: bat_stat = "charging"; break;
1463 default: bat_stat = "unknown"; break;
1464 }
1465 printk(KERN_INFO
1466 "apm: AC %s, battery status %s, battery life ",
1467 power_stat, bat_stat);
1468 if ((cx & 0xff) == 0xff)
1469 printk("unknown\n");
1470 else
1471 printk("%d%%\n", cx & 0xff);
1472 if (apm_bios_info.version > 0x100) {
1473 printk(KERN_INFO
1474 "apm: battery flag 0x%02x, battery life ",
1475 (cx >> 8) & 0xff);
1476 if (dx == 0xffff)
1477 printk("unknown\n");
1478 else
1479 printk("%d %s\n", dx & 0x7fff,
1480 (dx & 0x8000) ?
1481 "minutes" : "seconds");
1482 }
1483 }
1484 }
1485
1486 #ifdef CONFIG_APM_DO_ENABLE
1487 if (apm_bios_info.flags & APM_BIOS_DISABLED) {
1488 /*
1489 * This call causes my NEC UltraLite Versa 33/C to hang if it
1490 * is booted with PM disabled but not in the docking station.
1491 * Unfortunate ...
1492 */
1493 error = apm_enable_power_management(1);
1494 if (error) {
1495 apm_error("enable power management", error);
1496 return -1;
1497 }
1498 }
1499 #endif
1500 if ((apm_bios_info.flags & APM_BIOS_DISENGAGED)
1501 && (apm_bios_info.version > 0x0100)) {
1502 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1503 if (error) {
1504 apm_error("engage power management", error);
1505 return -1;
1506 }
1507 }
1508
1509 /* Install our power off handler.. */
1510 if (power_off)
1511 pm_power_off = apm_power_off;
1512 #ifdef CONFIG_MAGIC_SYSRQ
1513 sysrq_power_off = apm_power_off;
1514 #endif
1515 if (smp_num_cpus == 1) {
1516 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1517 console_blank_hook = apm_console_blank;
1518 #endif
1519 apm_mainloop();
1520 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1521 console_blank_hook = NULL;
1522 #endif
1523 }
1524 kapmd_running = 0;
1525
1526 return 0;
1527 }
1528
1529 #ifndef MODULE
1530 static int __init apm_setup(char *str)
1531 {
1532 int invert;
1533
1534 while ((str != NULL) && (*str != '\0')) {
1535 if (strncmp(str, "off", 3) == 0)
1536 apm_disabled = 1;
1537 if (strncmp(str, "on", 2) == 0)
1538 apm_disabled = 0;
1539 invert = (strncmp(str, "no-", 3) == 0);
1540 if (invert)
1541 str += 3;
1542 if (strncmp(str, "debug", 5) == 0)
1543 debug = !invert;
1544 if ((strncmp(str, "power-off", 9) == 0) ||
1545 (strncmp(str, "power_off", 9) == 0))
1546 power_off = !invert;
1547 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1548 (strncmp(str, "bounce_interval=", 16) == 0))
1549 bounce_interval = simple_strtol(str + 16, NULL, 0);
1550 str = strchr(str, ',');
1551 if (str != NULL)
1552 str += strspn(str, ", \t");
1553 }
1554 return 1;
1555 }
1556
1557 __setup("apm=", apm_setup);
1558 #endif
1559
1560 static struct file_operations apm_bios_fops = {
1561 owner: THIS_MODULE,
1562 read: do_read,
1563 poll: do_poll,
1564 ioctl: do_ioctl,
1565 open: do_open,
1566 release: do_release,
1567 };
1568
1569 static struct miscdevice apm_device = {
1570 APM_MINOR_DEV,
1571 "apm_bios",
1572 &apm_bios_fops
1573 };
1574
1575 /*
1576 * Just start the APM thread. We do NOT want to do APM BIOS
1577 * calls from anything but the APM thread, if for no other reason
1578 * than the fact that we don't trust the APM BIOS. This way,
1579 * most common APM BIOS problems that lead to protection errors
1580 * etc will have at least some level of being contained...
1581 *
1582 * In short, if something bad happens, at least we have a choice
1583 * of just killing the apm thread..
1584 */
1585 static int __init apm_init(void)
1586 {
1587 if (apm_bios_info.version == 0) {
1588 printk(KERN_INFO "apm: BIOS not found.\n");
1589 return -ENODEV;
1590 }
1591 printk(KERN_INFO
1592 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
1593 ((apm_bios_info.version >> 8) & 0xff),
1594 (apm_bios_info.version & 0xff),
1595 apm_bios_info.flags,
1596 driver_version);
1597 if ((apm_bios_info.flags & APM_32_BIT_SUPPORT) == 0) {
1598 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
1599 return -ENODEV;
1600 }
1601
1602 /*
1603 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
1604 * but is reportedly a 1.0 BIOS.
1605 */
1606 if (apm_bios_info.version == 0x001)
1607 apm_bios_info.version = 0x100;
1608
1609 /* BIOS < 1.2 doesn't set cseg_16_len */
1610 if (apm_bios_info.version < 0x102)
1611 apm_bios_info.cseg_16_len = 0; /* 64k */
1612
1613 if (debug) {
1614 printk(KERN_INFO "apm: entry %x:%lx cseg16 %x dseg %x",
1615 apm_bios_info.cseg, apm_bios_info.offset,
1616 apm_bios_info.cseg_16, apm_bios_info.dseg);
1617 if (apm_bios_info.version > 0x100)
1618 printk(" cseg len %x, dseg len %x",
1619 apm_bios_info.cseg_len,
1620 apm_bios_info.dseg_len);
1621 if (apm_bios_info.version > 0x101)
1622 printk(" cseg16 len %x", apm_bios_info.cseg_16_len);
1623 printk("\n");
1624 }
1625
1626 if (apm_disabled) {
1627 printk(KERN_NOTICE "apm: disabled on user request.\n");
1628 return -ENODEV;
1629 }
1630 if ((smp_num_cpus > 1) && !power_off) {
1631 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
1632 return -ENODEV;
1633 }
1634 if (PM_IS_ACTIVE()) {
1635 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
1636 return -ENODEV;
1637 }
1638 pm_active = 1;
1639
1640 /*
1641 * Set up a segment that references the real mode segment 0x40
1642 * that extends up to the end of page zero (that we have reserved).
1643 * This is for buggy BIOS's that refer to (real mode) segment 0x40
1644 * even though they are called in protected mode.
1645 */
1646 set_base(gdt[APM_40 >> 3],
1647 __va((unsigned long)0x40 << 4));
1648 _set_limit((char *)&gdt[APM_40 >> 3], 4095 - (0x40 << 4));
1649
1650 apm_bios_entry.offset = apm_bios_info.offset;
1651 apm_bios_entry.segment = APM_CS;
1652 set_base(gdt[APM_CS >> 3],
1653 __va((unsigned long)apm_bios_info.cseg << 4));
1654 set_base(gdt[APM_CS_16 >> 3],
1655 __va((unsigned long)apm_bios_info.cseg_16 << 4));
1656 set_base(gdt[APM_DS >> 3],
1657 __va((unsigned long)apm_bios_info.dseg << 4));
1658 #ifndef APM_RELAX_SEGMENTS
1659 if (apm_bios_info.version == 0x100) {
1660 #endif
1661 /* For ASUS motherboard, Award BIOS rev 110 (and others?) */
1662 _set_limit((char *)&gdt[APM_CS >> 3], 64 * 1024 - 1);
1663 /* For some unknown machine. */
1664 _set_limit((char *)&gdt[APM_CS_16 >> 3], 64 * 1024 - 1);
1665 /* For the DEC Hinote Ultra CT475 (and others?) */
1666 _set_limit((char *)&gdt[APM_DS >> 3], 64 * 1024 - 1);
1667 #ifndef APM_RELAX_SEGMENTS
1668 } else {
1669 _set_limit((char *)&gdt[APM_CS >> 3],
1670 (apm_bios_info.cseg_len - 1) & 0xffff);
1671 _set_limit((char *)&gdt[APM_CS_16 >> 3],
1672 (apm_bios_info.cseg_16_len - 1) & 0xffff);
1673 _set_limit((char *)&gdt[APM_DS >> 3],
1674 (apm_bios_info.dseg_len - 1) & 0xffff);
1675 }
1676 #endif
1677
1678 create_proc_info_entry("apm", 0, NULL, apm_get_info);
1679
1680 kernel_thread(apm, NULL, CLONE_FS | CLONE_FILES | CLONE_SIGHAND | SIGCHLD);
1681
1682 if (smp_num_cpus > 1) {
1683 printk(KERN_NOTICE
1684 "apm: disabled - APM is not SMP safe (power off active).\n");
1685 return 0;
1686 }
1687
1688 misc_register(&apm_device);
1689
1690 return 0;
1691 }
1692
1693 static void __exit apm_exit(void)
1694 {
1695 misc_deregister(&apm_device);
1696 remove_proc_entry("apm", NULL);
1697 #ifdef CONFIG_MAGIC_SYSRQ
1698 sysrq_power_off = NULL;
1699 #endif
1700 if (power_off)
1701 pm_power_off = NULL;
1702 exit_kapmd = 1;
1703 while (kapmd_running)
1704 schedule();
1705 pm_active = 0;
1706 }
1707
1708 module_init(apm_init);
1709 module_exit(apm_exit);
1710
1711 MODULE_AUTHOR("Stephen Rothwell");
1712 MODULE_DESCRIPTION("Advanced Power Management");
1713 MODULE_PARM(debug, "i");
1714 MODULE_PARM_DESC(debug, "Enable debug mode");
1715 MODULE_PARM(power_off, "i");
1716 MODULE_PARM_DESC(power_off, "Enable power off");
1717 MODULE_PARM(bounce_interval, "i");
1718 MODULE_PARM_DESC(bounce_interval, "Set the number of ticks to ignore suspend bounces");
1719
1720 EXPORT_NO_SYMBOLS;
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