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204#define pr_fmt(fmt) "apm: " fmt
205
206#include <linux/module.h>
207
208#include <linux/poll.h>
209#include <linux/types.h>
210#include <linux/stddef.h>
211#include <linux/timer.h>
212#include <linux/fcntl.h>
213#include <linux/slab.h>
214#include <linux/stat.h>
215#include <linux/proc_fs.h>
216#include <linux/seq_file.h>
217#include <linux/miscdevice.h>
218#include <linux/apm_bios.h>
219#include <linux/init.h>
220#include <linux/time.h>
221#include <linux/sched.h>
222#include <linux/pm.h>
223#include <linux/capability.h>
224#include <linux/device.h>
225#include <linux/kernel.h>
226#include <linux/freezer.h>
227#include <linux/smp.h>
228#include <linux/dmi.h>
229#include <linux/suspend.h>
230#include <linux/kthread.h>
231#include <linux/jiffies.h>
232#include <linux/acpi.h>
233#include <linux/syscore_ops.h>
234#include <linux/i8253.h>
235#include <linux/cpuidle.h>
236
237#include <asm/uaccess.h>
238#include <asm/desc.h>
239#include <asm/olpc.h>
240#include <asm/paravirt.h>
241#include <asm/reboot.h>
242
243#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
244extern int (*console_blank_hook)(int);
245#endif
246
247
248
249
250
251#define APM_MINOR_DEV 134
252
253
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294
295
296#define ALWAYS_CALL_BUSY 1
297
298
299
300
301
302
303#define APM_ZERO_SEGS
304
305#include <asm/apm.h>
306
307
308
309
310
311
312#undef INIT_TIMER_AFTER_SUSPEND
313
314#ifdef INIT_TIMER_AFTER_SUSPEND
315#include <linux/timex.h>
316#include <asm/io.h>
317#include <linux/delay.h>
318#endif
319
320
321
322
323#define APM_CHECK_TIMEOUT (HZ)
324
325
326
327
328#define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
329
330
331
332
333#define APM_MAX_EVENTS 20
334
335
336
337
338struct apm_user {
339 int magic;
340 struct apm_user *next;
341 unsigned int suser: 1;
342 unsigned int writer: 1;
343 unsigned int reader: 1;
344 unsigned int suspend_wait: 1;
345 int suspend_result;
346 int suspends_pending;
347 int standbys_pending;
348 int suspends_read;
349 int standbys_read;
350 int event_head;
351 int event_tail;
352 apm_event_t events[APM_MAX_EVENTS];
353};
354
355
356
357
358#define APM_BIOS_MAGIC 0x4101
359
360
361
362
363#ifdef CONFIG_APM_CPU_IDLE
364#define DEFAULT_IDLE_THRESHOLD 95
365#else
366#define DEFAULT_IDLE_THRESHOLD 100
367#endif
368#define DEFAULT_IDLE_PERIOD (100 / 3)
369
370static int apm_cpu_idle(struct cpuidle_device *dev,
371 struct cpuidle_driver *drv, int index);
372
373static struct cpuidle_driver apm_idle_driver = {
374 .name = "apm_idle",
375 .owner = THIS_MODULE,
376 .states = {
377 { },
378 {
379 .name = "APM",
380 .desc = "APM idle",
381 .flags = CPUIDLE_FLAG_TIME_VALID,
382 .exit_latency = 250,
383 .target_residency = 500,
384 .enter = &apm_cpu_idle
385 },
386 },
387 .state_count = 2,
388};
389
390static struct cpuidle_device apm_cpuidle_device;
391
392
393
394
395__visible struct {
396 unsigned long offset;
397 unsigned short segment;
398} apm_bios_entry;
399static int clock_slowed;
400static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
401static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
402static int suspends_pending;
403static int standbys_pending;
404static int ignore_sys_suspend;
405static int ignore_normal_resume;
406static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
407
408static bool debug __read_mostly;
409static bool smp __read_mostly;
410static int apm_disabled = -1;
411#ifdef CONFIG_SMP
412static bool power_off;
413#else
414static bool power_off = 1;
415#endif
416static bool realmode_power_off;
417#ifdef CONFIG_APM_ALLOW_INTS
418static bool allow_ints = 1;
419#else
420static bool allow_ints;
421#endif
422static bool broken_psr;
423
424static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
425static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
426static struct apm_user *user_list;
427static DEFINE_SPINLOCK(user_list_lock);
428static DEFINE_MUTEX(apm_mutex);
429
430
431
432
433
434
435
436static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
437 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
438
439static const char driver_version[] = "1.16ac";
440
441static struct task_struct *kapmd_task;
442
443
444
445
446
447static const char * const apm_event_name[] = {
448 "system standby",
449 "system suspend",
450 "normal resume",
451 "critical resume",
452 "low battery",
453 "power status change",
454 "update time",
455 "critical suspend",
456 "user standby",
457 "user suspend",
458 "system standby resume",
459 "capabilities change"
460};
461#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
462
463typedef struct lookup_t {
464 int key;
465 char *msg;
466} lookup_t;
467
468
469
470
471
472
473static const lookup_t error_table[] = {
474
475 { APM_DISABLED, "Power management disabled" },
476 { APM_CONNECTED, "Real mode interface already connected" },
477 { APM_NOT_CONNECTED, "Interface not connected" },
478 { APM_16_CONNECTED, "16 bit interface already connected" },
479
480 { APM_32_CONNECTED, "32 bit interface already connected" },
481 { APM_32_UNSUPPORTED, "32 bit interface not supported" },
482 { APM_BAD_DEVICE, "Unrecognized device ID" },
483 { APM_BAD_PARAM, "Parameter out of range" },
484 { APM_NOT_ENGAGED, "Interface not engaged" },
485 { APM_BAD_FUNCTION, "Function not supported" },
486 { APM_RESUME_DISABLED, "Resume timer disabled" },
487 { APM_BAD_STATE, "Unable to enter requested state" },
488
489 { APM_NO_ERROR, "BIOS did not set a return code" },
490 { APM_NOT_PRESENT, "No APM present" }
491};
492#define ERROR_COUNT ARRAY_SIZE(error_table)
493
494
495
496
497
498
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500
501
502
503static void apm_error(char *str, int err)
504{
505 int i;
506
507 for (i = 0; i < ERROR_COUNT; i++)
508 if (error_table[i].key == err)
509 break;
510 if (i < ERROR_COUNT)
511 pr_notice("%s: %s\n", str, error_table[i].msg);
512 else if (err < 0)
513 pr_notice("%s: linux error code %i\n", str, err);
514 else
515 pr_notice("%s: unknown error code %#2.2x\n",
516 str, err);
517}
518
519
520
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531
532
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534
535
536static inline unsigned long __apm_irq_save(void)
537{
538 unsigned long flags;
539 local_save_flags(flags);
540 if (apm_info.allow_ints) {
541 if (irqs_disabled_flags(flags))
542 local_irq_enable();
543 } else
544 local_irq_disable();
545
546 return flags;
547}
548
549#define apm_irq_save(flags) \
550 do { flags = __apm_irq_save(); } while (0)
551
552static inline void apm_irq_restore(unsigned long flags)
553{
554 if (irqs_disabled_flags(flags))
555 local_irq_disable();
556 else if (irqs_disabled())
557 local_irq_enable();
558}
559
560#ifdef APM_ZERO_SEGS
561# define APM_DECL_SEGS \
562 unsigned int saved_fs; unsigned int saved_gs;
563# define APM_DO_SAVE_SEGS \
564 savesegment(fs, saved_fs); savesegment(gs, saved_gs)
565# define APM_DO_RESTORE_SEGS \
566 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
567#else
568# define APM_DECL_SEGS
569# define APM_DO_SAVE_SEGS
570# define APM_DO_RESTORE_SEGS
571#endif
572
573struct apm_bios_call {
574 u32 func;
575
576 u32 ebx;
577 u32 ecx;
578
579 u32 eax;
580 u32 edx;
581 u32 esi;
582
583
584 int err;
585};
586
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599
600
601static long __apm_bios_call(void *_call)
602{
603 APM_DECL_SEGS
604 unsigned long flags;
605 int cpu;
606 struct desc_struct save_desc_40;
607 struct desc_struct *gdt;
608 struct apm_bios_call *call = _call;
609
610 cpu = get_cpu();
611 BUG_ON(cpu != 0);
612 gdt = get_cpu_gdt_table(cpu);
613 save_desc_40 = gdt[0x40 / 8];
614 gdt[0x40 / 8] = bad_bios_desc;
615
616 apm_irq_save(flags);
617 APM_DO_SAVE_SEGS;
618 apm_bios_call_asm(call->func, call->ebx, call->ecx,
619 &call->eax, &call->ebx, &call->ecx, &call->edx,
620 &call->esi);
621 APM_DO_RESTORE_SEGS;
622 apm_irq_restore(flags);
623 gdt[0x40 / 8] = save_desc_40;
624 put_cpu();
625
626 return call->eax & 0xff;
627}
628
629
630static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
631{
632 int ret;
633
634
635
636 if (get_cpu() == 0) {
637 ret = fn(call);
638 put_cpu();
639 } else {
640 put_cpu();
641 ret = work_on_cpu(0, fn, call);
642 }
643
644
645 if (ret < 0)
646 call->err = ret;
647 else
648 call->err = (call->eax >> 8) & 0xff;
649
650 return ret;
651}
652
653
654
655
656
657
658
659static int apm_bios_call(struct apm_bios_call *call)
660{
661 return on_cpu0(__apm_bios_call, call);
662}
663
664
665
666
667
668
669
670
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673
674
675
676static long __apm_bios_call_simple(void *_call)
677{
678 u8 error;
679 APM_DECL_SEGS
680 unsigned long flags;
681 int cpu;
682 struct desc_struct save_desc_40;
683 struct desc_struct *gdt;
684 struct apm_bios_call *call = _call;
685
686 cpu = get_cpu();
687 BUG_ON(cpu != 0);
688 gdt = get_cpu_gdt_table(cpu);
689 save_desc_40 = gdt[0x40 / 8];
690 gdt[0x40 / 8] = bad_bios_desc;
691
692 apm_irq_save(flags);
693 APM_DO_SAVE_SEGS;
694 error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
695 &call->eax);
696 APM_DO_RESTORE_SEGS;
697 apm_irq_restore(flags);
698 gdt[0x40 / 8] = save_desc_40;
699 put_cpu();
700 return error;
701}
702
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716
717static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
718 int *err)
719{
720 struct apm_bios_call call;
721 int ret;
722
723 call.func = func;
724 call.ebx = ebx_in;
725 call.ecx = ecx_in;
726
727 ret = on_cpu0(__apm_bios_call_simple, &call);
728 *eax = call.eax;
729 *err = call.err;
730 return ret;
731}
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746
747
748
749static int apm_driver_version(u_short *val)
750{
751 u32 eax;
752 int err;
753
754 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
755 return err;
756 *val = eax;
757 return APM_SUCCESS;
758}
759
760
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764
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775
776static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
777{
778 struct apm_bios_call call;
779
780 call.func = APM_FUNC_GET_EVENT;
781 call.ebx = call.ecx = 0;
782
783 if (apm_bios_call(&call))
784 return call.err;
785
786 *event = call.ebx;
787 if (apm_info.connection_version < 0x0102)
788 *info = ~0;
789 else
790 *info = call.ecx;
791 return APM_SUCCESS;
792}
793
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807
808static int set_power_state(u_short what, u_short state)
809{
810 u32 eax;
811 int err;
812
813 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
814 return err;
815 return APM_SUCCESS;
816}
817
818
819
820
821
822
823
824
825static int set_system_power_state(u_short state)
826{
827 return set_power_state(APM_DEVICE_ALL, state);
828}
829
830
831
832
833
834
835
836
837
838
839static int apm_do_idle(void)
840{
841 u32 eax;
842 u8 ret = 0;
843 int idled = 0;
844 int polling;
845 int err = 0;
846
847 polling = !!(current_thread_info()->status & TS_POLLING);
848 if (polling) {
849 current_thread_info()->status &= ~TS_POLLING;
850
851
852
853
854 smp_mb();
855 }
856 if (!need_resched()) {
857 idled = 1;
858 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
859 }
860 if (polling)
861 current_thread_info()->status |= TS_POLLING;
862
863 if (!idled)
864 return 0;
865
866 if (ret) {
867 static unsigned long t;
868
869
870
871
872 if (++t < 5) {
873 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
874 t = jiffies;
875 }
876 return -1;
877 }
878 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
879 return clock_slowed;
880}
881
882
883
884
885
886
887
888static void apm_do_busy(void)
889{
890 u32 dummy;
891 int err;
892
893 if (clock_slowed || ALWAYS_CALL_BUSY) {
894 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
895 clock_slowed = 0;
896 }
897}
898
899
900
901
902
903
904
905#define IDLE_CALC_LIMIT (HZ * 100)
906#define IDLE_LEAKY_MAX 16
907
908
909
910
911
912
913
914
915
916static int apm_cpu_idle(struct cpuidle_device *dev,
917 struct cpuidle_driver *drv, int index)
918{
919 static int use_apm_idle;
920 static unsigned int last_jiffies;
921 static unsigned int last_stime;
922 cputime_t stime;
923
924 int apm_idle_done = 0;
925 unsigned int jiffies_since_last_check = jiffies - last_jiffies;
926 unsigned int bucket;
927
928recalc:
929 task_cputime(current, NULL, &stime);
930 if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
931 use_apm_idle = 0;
932 } else if (jiffies_since_last_check > idle_period) {
933 unsigned int idle_percentage;
934
935 idle_percentage = stime - last_stime;
936 idle_percentage *= 100;
937 idle_percentage /= jiffies_since_last_check;
938 use_apm_idle = (idle_percentage > idle_threshold);
939 if (apm_info.forbid_idle)
940 use_apm_idle = 0;
941 }
942
943 last_jiffies = jiffies;
944 last_stime = stime;
945
946 bucket = IDLE_LEAKY_MAX;
947
948 while (!need_resched()) {
949 if (use_apm_idle) {
950 unsigned int t;
951
952 t = jiffies;
953 switch (apm_do_idle()) {
954 case 0:
955 apm_idle_done = 1;
956 if (t != jiffies) {
957 if (bucket) {
958 bucket = IDLE_LEAKY_MAX;
959 continue;
960 }
961 } else if (bucket) {
962 bucket--;
963 continue;
964 }
965 break;
966 case 1:
967 apm_idle_done = 1;
968 break;
969 default:
970 break;
971 }
972 }
973 default_idle();
974 local_irq_disable();
975 jiffies_since_last_check = jiffies - last_jiffies;
976 if (jiffies_since_last_check > idle_period)
977 goto recalc;
978 }
979
980 if (apm_idle_done)
981 apm_do_busy();
982
983 return index;
984}
985
986
987
988
989
990
991
992
993
994
995
996static void apm_power_off(void)
997{
998
999 if (apm_info.realmode_power_off) {
1000 set_cpus_allowed_ptr(current, cpumask_of(0));
1001 machine_real_restart(MRR_APM);
1002 } else {
1003 (void)set_system_power_state(APM_STATE_OFF);
1004 }
1005}
1006
1007#ifdef CONFIG_APM_DO_ENABLE
1008
1009
1010
1011
1012
1013
1014
1015
1016static int apm_enable_power_management(int enable)
1017{
1018 u32 eax;
1019 int err;
1020
1021 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1022 return APM_NOT_ENGAGED;
1023 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1024 enable, &eax, &err))
1025 return err;
1026 if (enable)
1027 apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1028 else
1029 apm_info.bios.flags |= APM_BIOS_DISABLED;
1030 return APM_SUCCESS;
1031}
1032#endif
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1049{
1050 struct apm_bios_call call;
1051
1052 call.func = APM_FUNC_GET_STATUS;
1053 call.ebx = APM_DEVICE_ALL;
1054 call.ecx = 0;
1055
1056 if (apm_info.get_power_status_broken)
1057 return APM_32_UNSUPPORTED;
1058 if (apm_bios_call(&call))
1059 return call.err;
1060 *status = call.ebx;
1061 *bat = call.ecx;
1062 if (apm_info.get_power_status_swabinminutes) {
1063 *life = swab16((u16)call.edx);
1064 *life |= 0x8000;
1065 } else
1066 *life = call.edx;
1067 return APM_SUCCESS;
1068}
1069
1070#if 0
1071static int apm_get_battery_status(u_short which, u_short *status,
1072 u_short *bat, u_short *life, u_short *nbat)
1073{
1074 u32 eax;
1075 u32 ebx;
1076 u32 ecx;
1077 u32 edx;
1078 u32 esi;
1079
1080 if (apm_info.connection_version < 0x0102) {
1081
1082 if (which != 1)
1083 return APM_BAD_DEVICE;
1084 *nbat = 1;
1085 return apm_get_power_status(status, bat, life);
1086 }
1087
1088 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1089 &ebx, &ecx, &edx, &esi))
1090 return (eax >> 8) & 0xff;
1091 *status = ebx;
1092 *bat = ecx;
1093 *life = edx;
1094 *nbat = esi;
1095 return APM_SUCCESS;
1096}
1097#endif
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108static int apm_engage_power_management(u_short device, int enable)
1109{
1110 u32 eax;
1111 int err;
1112
1113 if ((enable == 0) && (device == APM_DEVICE_ALL)
1114 && (apm_info.bios.flags & APM_BIOS_DISABLED))
1115 return APM_DISABLED;
1116 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1117 &eax, &err))
1118 return err;
1119 if (device == APM_DEVICE_ALL) {
1120 if (enable)
1121 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1122 else
1123 apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1124 }
1125 return APM_SUCCESS;
1126}
1127
1128#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140static int apm_console_blank(int blank)
1141{
1142 int error = APM_NOT_ENGAGED;
1143 int i;
1144 u_short state;
1145 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1146
1147 state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1148
1149 for (i = 0; i < ARRAY_SIZE(dev); i++) {
1150 error = set_power_state(dev[i], state);
1151
1152 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1153 return 1;
1154
1155 if (error == APM_NOT_ENGAGED)
1156 break;
1157 }
1158
1159 if (error == APM_NOT_ENGAGED) {
1160 static int tried;
1161 int eng_error;
1162 if (tried++ == 0) {
1163 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1164 if (eng_error) {
1165 apm_error("set display", error);
1166 apm_error("engage interface", eng_error);
1167 return 0;
1168 } else
1169 return apm_console_blank(blank);
1170 }
1171 }
1172 apm_error("set display", error);
1173 return 0;
1174}
1175#endif
1176
1177static int queue_empty(struct apm_user *as)
1178{
1179 return as->event_head == as->event_tail;
1180}
1181
1182static apm_event_t get_queued_event(struct apm_user *as)
1183{
1184 if (++as->event_tail >= APM_MAX_EVENTS)
1185 as->event_tail = 0;
1186 return as->events[as->event_tail];
1187}
1188
1189static void queue_event(apm_event_t event, struct apm_user *sender)
1190{
1191 struct apm_user *as;
1192
1193 spin_lock(&user_list_lock);
1194 if (user_list == NULL)
1195 goto out;
1196 for (as = user_list; as != NULL; as = as->next) {
1197 if ((as == sender) || (!as->reader))
1198 continue;
1199 if (++as->event_head >= APM_MAX_EVENTS)
1200 as->event_head = 0;
1201
1202 if (as->event_head == as->event_tail) {
1203 static int notified;
1204
1205 if (notified++ == 0)
1206 pr_err("an event queue overflowed\n");
1207 if (++as->event_tail >= APM_MAX_EVENTS)
1208 as->event_tail = 0;
1209 }
1210 as->events[as->event_head] = event;
1211 if (!as->suser || !as->writer)
1212 continue;
1213 switch (event) {
1214 case APM_SYS_SUSPEND:
1215 case APM_USER_SUSPEND:
1216 as->suspends_pending++;
1217 suspends_pending++;
1218 break;
1219
1220 case APM_SYS_STANDBY:
1221 case APM_USER_STANDBY:
1222 as->standbys_pending++;
1223 standbys_pending++;
1224 break;
1225 }
1226 }
1227 wake_up_interruptible(&apm_waitqueue);
1228out:
1229 spin_unlock(&user_list_lock);
1230}
1231
1232static void reinit_timer(void)
1233{
1234#ifdef INIT_TIMER_AFTER_SUSPEND
1235 unsigned long flags;
1236
1237 raw_spin_lock_irqsave(&i8253_lock, flags);
1238
1239 outb_p(0x34, PIT_MODE);
1240 udelay(10);
1241 outb_p(LATCH & 0xff, PIT_CH0);
1242 udelay(10);
1243 outb_p(LATCH >> 8, PIT_CH0);
1244 udelay(10);
1245 raw_spin_unlock_irqrestore(&i8253_lock, flags);
1246#endif
1247}
1248
1249static int suspend(int vetoable)
1250{
1251 int err;
1252 struct apm_user *as;
1253
1254 dpm_suspend_start(PMSG_SUSPEND);
1255 dpm_suspend_end(PMSG_SUSPEND);
1256
1257 local_irq_disable();
1258 syscore_suspend();
1259
1260 local_irq_enable();
1261
1262 save_processor_state();
1263 err = set_system_power_state(APM_STATE_SUSPEND);
1264 ignore_normal_resume = 1;
1265 restore_processor_state();
1266
1267 local_irq_disable();
1268 reinit_timer();
1269
1270 if (err == APM_NO_ERROR)
1271 err = APM_SUCCESS;
1272 if (err != APM_SUCCESS)
1273 apm_error("suspend", err);
1274 err = (err == APM_SUCCESS) ? 0 : -EIO;
1275
1276 syscore_resume();
1277 local_irq_enable();
1278
1279 dpm_resume_start(PMSG_RESUME);
1280 dpm_resume_end(PMSG_RESUME);
1281
1282 queue_event(APM_NORMAL_RESUME, NULL);
1283 spin_lock(&user_list_lock);
1284 for (as = user_list; as != NULL; as = as->next) {
1285 as->suspend_wait = 0;
1286 as->suspend_result = err;
1287 }
1288 spin_unlock(&user_list_lock);
1289 wake_up_interruptible(&apm_suspend_waitqueue);
1290 return err;
1291}
1292
1293static void standby(void)
1294{
1295 int err;
1296
1297 dpm_suspend_end(PMSG_SUSPEND);
1298
1299 local_irq_disable();
1300 syscore_suspend();
1301 local_irq_enable();
1302
1303 err = set_system_power_state(APM_STATE_STANDBY);
1304 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1305 apm_error("standby", err);
1306
1307 local_irq_disable();
1308 syscore_resume();
1309 local_irq_enable();
1310
1311 dpm_resume_start(PMSG_RESUME);
1312}
1313
1314static apm_event_t get_event(void)
1315{
1316 int error;
1317 apm_event_t event = APM_NO_EVENTS;
1318 apm_eventinfo_t info;
1319
1320 static int notified;
1321
1322
1323 error = apm_get_event(&event, &info);
1324 if (error == APM_SUCCESS)
1325 return event;
1326
1327 if ((error != APM_NO_EVENTS) && (notified++ == 0))
1328 apm_error("get_event", error);
1329
1330 return 0;
1331}
1332
1333static void check_events(void)
1334{
1335 apm_event_t event;
1336 static unsigned long last_resume;
1337 static int ignore_bounce;
1338
1339 while ((event = get_event()) != 0) {
1340 if (debug) {
1341 if (event <= NR_APM_EVENT_NAME)
1342 printk(KERN_DEBUG "apm: received %s notify\n",
1343 apm_event_name[event - 1]);
1344 else
1345 printk(KERN_DEBUG "apm: received unknown "
1346 "event 0x%02x\n", event);
1347 }
1348 if (ignore_bounce
1349 && (time_after(jiffies, last_resume + bounce_interval)))
1350 ignore_bounce = 0;
1351
1352 switch (event) {
1353 case APM_SYS_STANDBY:
1354 case APM_USER_STANDBY:
1355 queue_event(event, NULL);
1356 if (standbys_pending <= 0)
1357 standby();
1358 break;
1359
1360 case APM_USER_SUSPEND:
1361#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1362 if (apm_info.connection_version > 0x100)
1363 set_system_power_state(APM_STATE_REJECT);
1364 break;
1365#endif
1366 case APM_SYS_SUSPEND:
1367 if (ignore_bounce) {
1368 if (apm_info.connection_version > 0x100)
1369 set_system_power_state(APM_STATE_REJECT);
1370 break;
1371 }
1372
1373
1374
1375
1376
1377
1378
1379
1380 if (ignore_sys_suspend)
1381 return;
1382 ignore_sys_suspend = 1;
1383 queue_event(event, NULL);
1384 if (suspends_pending <= 0)
1385 (void) suspend(1);
1386 break;
1387
1388 case APM_NORMAL_RESUME:
1389 case APM_CRITICAL_RESUME:
1390 case APM_STANDBY_RESUME:
1391 ignore_sys_suspend = 0;
1392 last_resume = jiffies;
1393 ignore_bounce = 1;
1394 if ((event != APM_NORMAL_RESUME)
1395 || (ignore_normal_resume == 0)) {
1396 dpm_resume_end(PMSG_RESUME);
1397 queue_event(event, NULL);
1398 }
1399 ignore_normal_resume = 0;
1400 break;
1401
1402 case APM_CAPABILITY_CHANGE:
1403 case APM_LOW_BATTERY:
1404 case APM_POWER_STATUS_CHANGE:
1405 queue_event(event, NULL);
1406
1407 break;
1408
1409 case APM_UPDATE_TIME:
1410 break;
1411
1412 case APM_CRITICAL_SUSPEND:
1413
1414
1415
1416 (void)suspend(0);
1417 break;
1418 }
1419 }
1420}
1421
1422static void apm_event_handler(void)
1423{
1424 static int pending_count = 4;
1425 int err;
1426
1427 if ((standbys_pending > 0) || (suspends_pending > 0)) {
1428 if ((apm_info.connection_version > 0x100) &&
1429 (pending_count-- <= 0)) {
1430 pending_count = 4;
1431 if (debug)
1432 printk(KERN_DEBUG "apm: setting state busy\n");
1433 err = set_system_power_state(APM_STATE_BUSY);
1434 if (err)
1435 apm_error("busy", err);
1436 }
1437 } else
1438 pending_count = 4;
1439 check_events();
1440}
1441
1442
1443
1444
1445
1446static void apm_mainloop(void)
1447{
1448 DECLARE_WAITQUEUE(wait, current);
1449
1450 add_wait_queue(&apm_waitqueue, &wait);
1451 set_current_state(TASK_INTERRUPTIBLE);
1452 for (;;) {
1453 schedule_timeout(APM_CHECK_TIMEOUT);
1454 if (kthread_should_stop())
1455 break;
1456
1457
1458
1459
1460 set_current_state(TASK_INTERRUPTIBLE);
1461 apm_event_handler();
1462 }
1463 remove_wait_queue(&apm_waitqueue, &wait);
1464}
1465
1466static int check_apm_user(struct apm_user *as, const char *func)
1467{
1468 if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1469 pr_err("%s passed bad filp\n", func);
1470 return 1;
1471 }
1472 return 0;
1473}
1474
1475static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1476{
1477 struct apm_user *as;
1478 int i;
1479 apm_event_t event;
1480
1481 as = fp->private_data;
1482 if (check_apm_user(as, "read"))
1483 return -EIO;
1484 if ((int)count < sizeof(apm_event_t))
1485 return -EINVAL;
1486 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1487 return -EAGAIN;
1488 wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1489 i = count;
1490 while ((i >= sizeof(event)) && !queue_empty(as)) {
1491 event = get_queued_event(as);
1492 if (copy_to_user(buf, &event, sizeof(event))) {
1493 if (i < count)
1494 break;
1495 return -EFAULT;
1496 }
1497 switch (event) {
1498 case APM_SYS_SUSPEND:
1499 case APM_USER_SUSPEND:
1500 as->suspends_read++;
1501 break;
1502
1503 case APM_SYS_STANDBY:
1504 case APM_USER_STANDBY:
1505 as->standbys_read++;
1506 break;
1507 }
1508 buf += sizeof(event);
1509 i -= sizeof(event);
1510 }
1511 if (i < count)
1512 return count - i;
1513 if (signal_pending(current))
1514 return -ERESTARTSYS;
1515 return 0;
1516}
1517
1518static unsigned int do_poll(struct file *fp, poll_table *wait)
1519{
1520 struct apm_user *as;
1521
1522 as = fp->private_data;
1523 if (check_apm_user(as, "poll"))
1524 return 0;
1525 poll_wait(fp, &apm_waitqueue, wait);
1526 if (!queue_empty(as))
1527 return POLLIN | POLLRDNORM;
1528 return 0;
1529}
1530
1531static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1532{
1533 struct apm_user *as;
1534 int ret;
1535
1536 as = filp->private_data;
1537 if (check_apm_user(as, "ioctl"))
1538 return -EIO;
1539 if (!as->suser || !as->writer)
1540 return -EPERM;
1541 switch (cmd) {
1542 case APM_IOC_STANDBY:
1543 mutex_lock(&apm_mutex);
1544 if (as->standbys_read > 0) {
1545 as->standbys_read--;
1546 as->standbys_pending--;
1547 standbys_pending--;
1548 } else
1549 queue_event(APM_USER_STANDBY, as);
1550 if (standbys_pending <= 0)
1551 standby();
1552 mutex_unlock(&apm_mutex);
1553 break;
1554 case APM_IOC_SUSPEND:
1555 mutex_lock(&apm_mutex);
1556 if (as->suspends_read > 0) {
1557 as->suspends_read--;
1558 as->suspends_pending--;
1559 suspends_pending--;
1560 } else
1561 queue_event(APM_USER_SUSPEND, as);
1562 if (suspends_pending <= 0) {
1563 ret = suspend(1);
1564 mutex_unlock(&apm_mutex);
1565 } else {
1566 as->suspend_wait = 1;
1567 mutex_unlock(&apm_mutex);
1568 wait_event_interruptible(apm_suspend_waitqueue,
1569 as->suspend_wait == 0);
1570 ret = as->suspend_result;
1571 }
1572 return ret;
1573 default:
1574 return -ENOTTY;
1575 }
1576 return 0;
1577}
1578
1579static int do_release(struct inode *inode, struct file *filp)
1580{
1581 struct apm_user *as;
1582
1583 as = filp->private_data;
1584 if (check_apm_user(as, "release"))
1585 return 0;
1586 filp->private_data = NULL;
1587 if (as->standbys_pending > 0) {
1588 standbys_pending -= as->standbys_pending;
1589 if (standbys_pending <= 0)
1590 standby();
1591 }
1592 if (as->suspends_pending > 0) {
1593 suspends_pending -= as->suspends_pending;
1594 if (suspends_pending <= 0)
1595 (void) suspend(1);
1596 }
1597 spin_lock(&user_list_lock);
1598 if (user_list == as)
1599 user_list = as->next;
1600 else {
1601 struct apm_user *as1;
1602
1603 for (as1 = user_list;
1604 (as1 != NULL) && (as1->next != as);
1605 as1 = as1->next)
1606 ;
1607 if (as1 == NULL)
1608 pr_err("filp not in user list\n");
1609 else
1610 as1->next = as->next;
1611 }
1612 spin_unlock(&user_list_lock);
1613 kfree(as);
1614 return 0;
1615}
1616
1617static int do_open(struct inode *inode, struct file *filp)
1618{
1619 struct apm_user *as;
1620
1621 as = kmalloc(sizeof(*as), GFP_KERNEL);
1622 if (as == NULL)
1623 return -ENOMEM;
1624
1625 as->magic = APM_BIOS_MAGIC;
1626 as->event_tail = as->event_head = 0;
1627 as->suspends_pending = as->standbys_pending = 0;
1628 as->suspends_read = as->standbys_read = 0;
1629
1630
1631
1632
1633
1634
1635
1636 as->suser = capable(CAP_SYS_ADMIN);
1637 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1638 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1639 spin_lock(&user_list_lock);
1640 as->next = user_list;
1641 user_list = as;
1642 spin_unlock(&user_list_lock);
1643 filp->private_data = as;
1644 return 0;
1645}
1646
1647static int proc_apm_show(struct seq_file *m, void *v)
1648{
1649 unsigned short bx;
1650 unsigned short cx;
1651 unsigned short dx;
1652 int error;
1653 unsigned short ac_line_status = 0xff;
1654 unsigned short battery_status = 0xff;
1655 unsigned short battery_flag = 0xff;
1656 int percentage = -1;
1657 int time_units = -1;
1658 char *units = "?";
1659
1660 if ((num_online_cpus() == 1) &&
1661 !(error = apm_get_power_status(&bx, &cx, &dx))) {
1662 ac_line_status = (bx >> 8) & 0xff;
1663 battery_status = bx & 0xff;
1664 if ((cx & 0xff) != 0xff)
1665 percentage = cx & 0xff;
1666
1667 if (apm_info.connection_version > 0x100) {
1668 battery_flag = (cx >> 8) & 0xff;
1669 if (dx != 0xffff) {
1670 units = (dx & 0x8000) ? "min" : "sec";
1671 time_units = dx & 0x7fff;
1672 }
1673 }
1674 }
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1714 driver_version,
1715 (apm_info.bios.version >> 8) & 0xff,
1716 apm_info.bios.version & 0xff,
1717 apm_info.bios.flags,
1718 ac_line_status,
1719 battery_status,
1720 battery_flag,
1721 percentage,
1722 time_units,
1723 units);
1724 return 0;
1725}
1726
1727static int proc_apm_open(struct inode *inode, struct file *file)
1728{
1729 return single_open(file, proc_apm_show, NULL);
1730}
1731
1732static const struct file_operations apm_file_ops = {
1733 .owner = THIS_MODULE,
1734 .open = proc_apm_open,
1735 .read = seq_read,
1736 .llseek = seq_lseek,
1737 .release = single_release,
1738};
1739
1740static int apm(void *unused)
1741{
1742 unsigned short bx;
1743 unsigned short cx;
1744 unsigned short dx;
1745 int error;
1746 char *power_stat;
1747 char *bat_stat;
1748
1749
1750
1751
1752
1753
1754
1755 set_cpus_allowed_ptr(current, cpumask_of(0));
1756 BUG_ON(smp_processor_id() != 0);
1757
1758 if (apm_info.connection_version == 0) {
1759 apm_info.connection_version = apm_info.bios.version;
1760 if (apm_info.connection_version > 0x100) {
1761
1762
1763
1764 if (apm_info.connection_version > 0x0102)
1765 apm_info.connection_version = 0x0102;
1766 error = apm_driver_version(&apm_info.connection_version);
1767 if (error != APM_SUCCESS) {
1768 apm_error("driver version", error);
1769
1770 apm_info.connection_version = 0x100;
1771 }
1772 }
1773 }
1774
1775 if (debug)
1776 printk(KERN_INFO "apm: Connection version %d.%d\n",
1777 (apm_info.connection_version >> 8) & 0xff,
1778 apm_info.connection_version & 0xff);
1779
1780#ifdef CONFIG_APM_DO_ENABLE
1781 if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1782
1783
1784
1785
1786
1787 error = apm_enable_power_management(1);
1788 if (error) {
1789 apm_error("enable power management", error);
1790 return -1;
1791 }
1792 }
1793#endif
1794
1795 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1796 && (apm_info.connection_version > 0x0100)) {
1797 error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1798 if (error) {
1799 apm_error("engage power management", error);
1800 return -1;
1801 }
1802 }
1803
1804 if (debug && (num_online_cpus() == 1 || smp)) {
1805 error = apm_get_power_status(&bx, &cx, &dx);
1806 if (error)
1807 printk(KERN_INFO "apm: power status not available\n");
1808 else {
1809 switch ((bx >> 8) & 0xff) {
1810 case 0:
1811 power_stat = "off line";
1812 break;
1813 case 1:
1814 power_stat = "on line";
1815 break;
1816 case 2:
1817 power_stat = "on backup power";
1818 break;
1819 default:
1820 power_stat = "unknown";
1821 break;
1822 }
1823 switch (bx & 0xff) {
1824 case 0:
1825 bat_stat = "high";
1826 break;
1827 case 1:
1828 bat_stat = "low";
1829 break;
1830 case 2:
1831 bat_stat = "critical";
1832 break;
1833 case 3:
1834 bat_stat = "charging";
1835 break;
1836 default:
1837 bat_stat = "unknown";
1838 break;
1839 }
1840 printk(KERN_INFO
1841 "apm: AC %s, battery status %s, battery life ",
1842 power_stat, bat_stat);
1843 if ((cx & 0xff) == 0xff)
1844 printk("unknown\n");
1845 else
1846 printk("%d%%\n", cx & 0xff);
1847 if (apm_info.connection_version > 0x100) {
1848 printk(KERN_INFO
1849 "apm: battery flag 0x%02x, battery life ",
1850 (cx >> 8) & 0xff);
1851 if (dx == 0xffff)
1852 printk("unknown\n");
1853 else
1854 printk("%d %s\n", dx & 0x7fff,
1855 (dx & 0x8000) ?
1856 "minutes" : "seconds");
1857 }
1858 }
1859 }
1860
1861
1862 if (power_off)
1863 pm_power_off = apm_power_off;
1864
1865 if (num_online_cpus() == 1 || smp) {
1866#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1867 console_blank_hook = apm_console_blank;
1868#endif
1869 apm_mainloop();
1870#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1871 console_blank_hook = NULL;
1872#endif
1873 }
1874
1875 return 0;
1876}
1877
1878#ifndef MODULE
1879static int __init apm_setup(char *str)
1880{
1881 int invert;
1882
1883 while ((str != NULL) && (*str != '\0')) {
1884 if (strncmp(str, "off", 3) == 0)
1885 apm_disabled = 1;
1886 if (strncmp(str, "on", 2) == 0)
1887 apm_disabled = 0;
1888 if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1889 (strncmp(str, "bounce_interval=", 16) == 0))
1890 bounce_interval = simple_strtol(str + 16, NULL, 0);
1891 if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1892 (strncmp(str, "idle_threshold=", 15) == 0))
1893 idle_threshold = simple_strtol(str + 15, NULL, 0);
1894 if ((strncmp(str, "idle-period=", 12) == 0) ||
1895 (strncmp(str, "idle_period=", 12) == 0))
1896 idle_period = simple_strtol(str + 12, NULL, 0);
1897 invert = (strncmp(str, "no-", 3) == 0) ||
1898 (strncmp(str, "no_", 3) == 0);
1899 if (invert)
1900 str += 3;
1901 if (strncmp(str, "debug", 5) == 0)
1902 debug = !invert;
1903 if ((strncmp(str, "power-off", 9) == 0) ||
1904 (strncmp(str, "power_off", 9) == 0))
1905 power_off = !invert;
1906 if (strncmp(str, "smp", 3) == 0) {
1907 smp = !invert;
1908 idle_threshold = 100;
1909 }
1910 if ((strncmp(str, "allow-ints", 10) == 0) ||
1911 (strncmp(str, "allow_ints", 10) == 0))
1912 apm_info.allow_ints = !invert;
1913 if ((strncmp(str, "broken-psr", 10) == 0) ||
1914 (strncmp(str, "broken_psr", 10) == 0))
1915 apm_info.get_power_status_broken = !invert;
1916 if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1917 (strncmp(str, "realmode_power_off", 18) == 0))
1918 apm_info.realmode_power_off = !invert;
1919 str = strchr(str, ',');
1920 if (str != NULL)
1921 str += strspn(str, ", \t");
1922 }
1923 return 1;
1924}
1925
1926__setup("apm=", apm_setup);
1927#endif
1928
1929static const struct file_operations apm_bios_fops = {
1930 .owner = THIS_MODULE,
1931 .read = do_read,
1932 .poll = do_poll,
1933 .unlocked_ioctl = do_ioctl,
1934 .open = do_open,
1935 .release = do_release,
1936 .llseek = noop_llseek,
1937};
1938
1939static struct miscdevice apm_device = {
1940 APM_MINOR_DEV,
1941 "apm_bios",
1942 &apm_bios_fops
1943};
1944
1945
1946
1947static int __init print_if_true(const struct dmi_system_id *d)
1948{
1949 printk("%s\n", d->ident);
1950 return 0;
1951}
1952
1953
1954
1955
1956
1957static int __init broken_ps2_resume(const struct dmi_system_id *d)
1958{
1959 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1960 "workaround hopefully not needed.\n", d->ident);
1961 return 0;
1962}
1963
1964
1965static int __init set_realmode_power_off(const struct dmi_system_id *d)
1966{
1967 if (apm_info.realmode_power_off == 0) {
1968 apm_info.realmode_power_off = 1;
1969 printk(KERN_INFO "%s bios detected. "
1970 "Using realmode poweroff only.\n", d->ident);
1971 }
1972 return 0;
1973}
1974
1975
1976static int __init set_apm_ints(const struct dmi_system_id *d)
1977{
1978 if (apm_info.allow_ints == 0) {
1979 apm_info.allow_ints = 1;
1980 printk(KERN_INFO "%s machine detected. "
1981 "Enabling interrupts during APM calls.\n", d->ident);
1982 }
1983 return 0;
1984}
1985
1986
1987static int __init apm_is_horked(const struct dmi_system_id *d)
1988{
1989 if (apm_info.disabled == 0) {
1990 apm_info.disabled = 1;
1991 printk(KERN_INFO "%s machine detected. "
1992 "Disabling APM.\n", d->ident);
1993 }
1994 return 0;
1995}
1996
1997static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1998{
1999 if (apm_info.disabled == 0) {
2000 apm_info.disabled = 1;
2001 printk(KERN_INFO "%s machine detected. "
2002 "Disabling APM.\n", d->ident);
2003 printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
2004 printk(KERN_INFO "download from support.intel.com\n");
2005 }
2006 return 0;
2007}
2008
2009
2010static int __init apm_likes_to_melt(const struct dmi_system_id *d)
2011{
2012 if (apm_info.forbid_idle == 0) {
2013 apm_info.forbid_idle = 1;
2014 printk(KERN_INFO "%s machine detected. "
2015 "Disabling APM idle calls.\n", d->ident);
2016 }
2017 return 0;
2018}
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035static int __init broken_apm_power(const struct dmi_system_id *d)
2036{
2037 apm_info.get_power_status_broken = 1;
2038 printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2039 "disabling power status reporting.\n");
2040 return 0;
2041}
2042
2043
2044
2045
2046
2047static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2048{
2049 apm_info.get_power_status_swabinminutes = 1;
2050 printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2051 "in minutes and wrong byte order.\n");
2052 return 0;
2053}
2054
2055static struct dmi_system_id __initdata apm_dmi_table[] = {
2056 {
2057 print_if_true,
2058 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2059 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2060 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2061 },
2062 {
2063 broken_ps2_resume, "Dell Latitude C600",
2064 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2065 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2066 },
2067 {
2068 set_apm_ints, "Dell Latitude",
2069 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2070 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2071 },
2072 {
2073 apm_is_horked, "Dell Inspiron 2500",
2074 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2075 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2076 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2077 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2078 },
2079 {
2080 set_apm_ints, "Dell Inspiron", {
2081 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2082 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2083 },
2084 {
2085 broken_apm_power, "Dell Inspiron 5000e",
2086 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2087 DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2088 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2089 },
2090 {
2091 broken_apm_power, "Dell Inspiron 2500",
2092 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2093 DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2094 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2095 },
2096 {
2097 apm_is_horked, "Dell Dimension 4100",
2098 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2099 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2100 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2101 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2102 },
2103 {
2104 set_apm_ints, "Compaq 12XL125",
2105 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2106 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2107 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2108 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2109 },
2110 {
2111 set_apm_ints, "ASUSTeK",
2112 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2113 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2114 },
2115 {
2116 apm_is_horked, "ABIT KX7-333[R]",
2117 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2118 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2119 },
2120 {
2121 apm_is_horked, "Trigem Delhi3",
2122 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2123 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2124 },
2125 {
2126 apm_is_horked, "Fujitsu-Siemens",
2127 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2128 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2129 },
2130 {
2131 apm_is_horked_d850md, "Intel D850MD",
2132 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2133 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2134 },
2135 {
2136 apm_is_horked, "Intel D810EMO",
2137 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2138 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2139 },
2140 {
2141 apm_is_horked, "Dell XPS-Z",
2142 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2143 DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2144 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2145 },
2146 {
2147 apm_is_horked, "Sharp PC-PJ/AX",
2148 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2149 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2150 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2151 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2152 },
2153 {
2154 apm_is_horked, "Dell Inspiron 2500",
2155 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2156 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2157 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2158 DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2159 },
2160 {
2161 apm_likes_to_melt, "Jabil AMD",
2162 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2163 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2164 },
2165 {
2166 apm_likes_to_melt, "AMI Bios",
2167 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2168 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2169 },
2170 {
2171 swab_apm_power_in_minutes, "Sony VAIO",
2172 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2173 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2174 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2175 },
2176 {
2177 swab_apm_power_in_minutes, "Sony VAIO",
2178 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2179 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2180 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2181 },
2182 {
2183 swab_apm_power_in_minutes, "Sony VAIO",
2184 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2185 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2186 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2187 },
2188 {
2189 swab_apm_power_in_minutes, "Sony VAIO",
2190 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2191 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2192 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2193 },
2194 {
2195 swab_apm_power_in_minutes, "Sony VAIO",
2196 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2197 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2198 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2199 },
2200 {
2201 swab_apm_power_in_minutes, "Sony VAIO",
2202 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2203 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2204 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2205 },
2206 {
2207 swab_apm_power_in_minutes, "Sony VAIO",
2208 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2209 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2210 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2211 },
2212 {
2213 swab_apm_power_in_minutes, "Sony VAIO",
2214 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2215 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2216 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2217 },
2218 {
2219 swab_apm_power_in_minutes, "Sony VAIO",
2220 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2221 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2222 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2223 },
2224 {
2225 swab_apm_power_in_minutes, "Sony VAIO",
2226 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2227 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2228 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2229 },
2230
2231 {
2232 swab_apm_power_in_minutes, "Sony VAIO",
2233 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2234 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2235 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2236 },
2237 {
2238 swab_apm_power_in_minutes, "Sony VAIO",
2239 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2240 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2241 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2242 },
2243 {
2244 swab_apm_power_in_minutes, "Sony VAIO",
2245 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2246 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2247 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2248 },
2249 {
2250 set_realmode_power_off, "Award Software v4.60 PGMA",
2251 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2252 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2253 DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2254 },
2255
2256
2257
2258 {
2259 set_apm_ints, "IBM",
2260 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2261 },
2262
2263 { }
2264};
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276static int __init apm_init(void)
2277{
2278 struct desc_struct *gdt;
2279 int err;
2280
2281 dmi_check_system(apm_dmi_table);
2282
2283 if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) {
2284 printk(KERN_INFO "apm: BIOS not found.\n");
2285 return -ENODEV;
2286 }
2287 printk(KERN_INFO
2288 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2289 ((apm_info.bios.version >> 8) & 0xff),
2290 (apm_info.bios.version & 0xff),
2291 apm_info.bios.flags,
2292 driver_version);
2293 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2294 printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2295 return -ENODEV;
2296 }
2297
2298 if (allow_ints)
2299 apm_info.allow_ints = 1;
2300 if (broken_psr)
2301 apm_info.get_power_status_broken = 1;
2302 if (realmode_power_off)
2303 apm_info.realmode_power_off = 1;
2304
2305 if (apm_disabled != -1)
2306 apm_info.disabled = apm_disabled;
2307
2308
2309
2310
2311
2312 if (apm_info.bios.version == 0x001)
2313 apm_info.bios.version = 0x100;
2314
2315
2316 if (apm_info.bios.version < 0x102)
2317 apm_info.bios.cseg_16_len = 0;
2318
2319 if (debug) {
2320 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2321 apm_info.bios.cseg, apm_info.bios.offset,
2322 apm_info.bios.cseg_16, apm_info.bios.dseg);
2323 if (apm_info.bios.version > 0x100)
2324 printk(" cseg len %x, dseg len %x",
2325 apm_info.bios.cseg_len,
2326 apm_info.bios.dseg_len);
2327 if (apm_info.bios.version > 0x101)
2328 printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2329 printk("\n");
2330 }
2331
2332 if (apm_info.disabled) {
2333 pr_notice("disabled on user request.\n");
2334 return -ENODEV;
2335 }
2336 if ((num_online_cpus() > 1) && !power_off && !smp) {
2337 pr_notice("disabled - APM is not SMP safe.\n");
2338 apm_info.disabled = 1;
2339 return -ENODEV;
2340 }
2341 if (!acpi_disabled) {
2342 pr_notice("overridden by ACPI.\n");
2343 apm_info.disabled = 1;
2344 return -ENODEV;
2345 }
2346
2347
2348
2349
2350
2351 apm_bios_entry.offset = apm_info.bios.offset;
2352 apm_bios_entry.segment = APM_CS;
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364 gdt = get_cpu_gdt_table(0);
2365 set_desc_base(&gdt[APM_CS >> 3],
2366 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2367 set_desc_base(&gdt[APM_CS_16 >> 3],
2368 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2369 set_desc_base(&gdt[APM_DS >> 3],
2370 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2371
2372 proc_create("apm", 0, NULL, &apm_file_ops);
2373
2374 kapmd_task = kthread_create(apm, NULL, "kapmd");
2375 if (IS_ERR(kapmd_task)) {
2376 pr_err("disabled - Unable to start kernel thread\n");
2377 err = PTR_ERR(kapmd_task);
2378 kapmd_task = NULL;
2379 remove_proc_entry("apm", NULL);
2380 return err;
2381 }
2382 wake_up_process(kapmd_task);
2383
2384 if (num_online_cpus() > 1 && !smp) {
2385 printk(KERN_NOTICE
2386 "apm: disabled - APM is not SMP safe (power off active).\n");
2387 return 0;
2388 }
2389
2390
2391
2392
2393
2394
2395 if (misc_register(&apm_device))
2396 printk(KERN_WARNING "apm: Could not register misc device.\n");
2397
2398 if (HZ != 100)
2399 idle_period = (idle_period * HZ) / 100;
2400 if (idle_threshold < 100) {
2401 if (!cpuidle_register_driver(&apm_idle_driver))
2402 if (cpuidle_register_device(&apm_cpuidle_device))
2403 cpuidle_unregister_driver(&apm_idle_driver);
2404 }
2405
2406 return 0;
2407}
2408
2409static void __exit apm_exit(void)
2410{
2411 int error;
2412
2413 cpuidle_unregister_device(&apm_cpuidle_device);
2414 cpuidle_unregister_driver(&apm_idle_driver);
2415
2416 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2417 && (apm_info.connection_version > 0x0100)) {
2418 error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2419 if (error)
2420 apm_error("disengage power management", error);
2421 }
2422 misc_deregister(&apm_device);
2423 remove_proc_entry("apm", NULL);
2424 if (power_off)
2425 pm_power_off = NULL;
2426 if (kapmd_task) {
2427 kthread_stop(kapmd_task);
2428 kapmd_task = NULL;
2429 }
2430}
2431
2432module_init(apm_init);
2433module_exit(apm_exit);
2434
2435MODULE_AUTHOR("Stephen Rothwell");
2436MODULE_DESCRIPTION("Advanced Power Management");
2437MODULE_LICENSE("GPL");
2438module_param(debug, bool, 0644);
2439MODULE_PARM_DESC(debug, "Enable debug mode");
2440module_param(power_off, bool, 0444);
2441MODULE_PARM_DESC(power_off, "Enable power off");
2442module_param(bounce_interval, int, 0444);
2443MODULE_PARM_DESC(bounce_interval,
2444 "Set the number of ticks to ignore suspend bounces");
2445module_param(allow_ints, bool, 0444);
2446MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2447module_param(broken_psr, bool, 0444);
2448MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2449module_param(realmode_power_off, bool, 0444);
2450MODULE_PARM_DESC(realmode_power_off,
2451 "Switch to real mode before powering off");
2452module_param(idle_threshold, int, 0444);
2453MODULE_PARM_DESC(idle_threshold,
2454 "System idle percentage above which to make APM BIOS idle calls");
2455module_param(idle_period, int, 0444);
2456MODULE_PARM_DESC(idle_period,
2457 "Period (in sec/100) over which to caculate the idle percentage");
2458module_param(smp, bool, 0444);
2459MODULE_PARM_DESC(smp,
2460 "Set this to enable APM use on an SMP platform. Use with caution on older systems");
2461MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
2462