summaryrefslogtreecommitdiffstats
path: root/drivers/platform/x86/toshiba_acpi.c
blob: ee79ce64d9dfbdb8a99061f59232325b8c57f6d3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
/*
 *  toshiba_acpi.c - Toshiba Laptop ACPI Extras
 *
 *
 *  Copyright (C) 2002-2004 John Belmonte
 *  Copyright (C) 2008 Philip Langdale
 *  Copyright (C) 2010 Pierre Ducroquet
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *
 *  The devolpment page for this driver is located at
 *  http://memebeam.org/toys/ToshibaAcpiDriver.
 *
 *  Credits:
 *	Jonathan A. Buzzard - Toshiba HCI info, and critical tips on reverse
 *		engineering the Windows drivers
 *	Yasushi Nagato - changes for linux kernel 2.4 -> 2.5
 *	Rob Miller - TV out and hotkeys help
 *
 *
 *  TODO
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#define TOSHIBA_ACPI_VERSION	"0.19"
#define PROC_INTERFACE_VERSION	1

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/backlight.h>
#include <linux/rfkill.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/i8042.h>

#include <asm/uaccess.h>

#include <acpi/acpi_drivers.h>

MODULE_AUTHOR("John Belmonte");
MODULE_DESCRIPTION("Toshiba Laptop ACPI Extras Driver");
MODULE_LICENSE("GPL");

#define TOSHIBA_WMI_EVENT_GUID "59142400-C6A3-40FA-BADB-8A2652834100"

/* Scan code for Fn key on TOS1900 models */
#define TOS1900_FN_SCAN		0x6e

/* Toshiba ACPI method paths */
#define METHOD_VIDEO_OUT	"\\_SB_.VALX.DSSX"

/* Toshiba HCI interface definitions
 *
 * HCI is Toshiba's "Hardware Control Interface" which is supposed to
 * be uniform across all their models.  Ideally we would just call
 * dedicated ACPI methods instead of using this primitive interface.
 * However the ACPI methods seem to be incomplete in some areas (for
 * example they allow setting, but not reading, the LCD brightness value),
 * so this is still useful.
 */

#define HCI_WORDS			6

/* operations */
#define HCI_SET				0xff00
#define HCI_GET				0xfe00

/* return codes */
#define HCI_SUCCESS			0x0000
#define HCI_FAILURE			0x1000
#define HCI_NOT_SUPPORTED		0x8000
#define HCI_EMPTY			0x8c00

/* registers */
#define HCI_FAN				0x0004
#define HCI_SYSTEM_EVENT		0x0016
#define HCI_VIDEO_OUT			0x001c
#define HCI_HOTKEY_EVENT		0x001e
#define HCI_LCD_BRIGHTNESS		0x002a
#define HCI_WIRELESS			0x0056

/* field definitions */
#define HCI_HOTKEY_DISABLE		0x0b
#define HCI_HOTKEY_ENABLE		0x09
#define HCI_LCD_BRIGHTNESS_BITS		3
#define HCI_LCD_BRIGHTNESS_SHIFT	(16-HCI_LCD_BRIGHTNESS_BITS)
#define HCI_LCD_BRIGHTNESS_LEVELS	(1 << HCI_LCD_BRIGHTNESS_BITS)
#define HCI_VIDEO_OUT_LCD		0x1
#define HCI_VIDEO_OUT_CRT		0x2
#define HCI_VIDEO_OUT_TV		0x4
#define HCI_WIRELESS_KILL_SWITCH	0x01
#define HCI_WIRELESS_BT_PRESENT		0x0f
#define HCI_WIRELESS_BT_ATTACH		0x40
#define HCI_WIRELESS_BT_POWER		0x80

struct toshiba_acpi_dev {
	struct acpi_device *acpi_dev;
	const char *method_hci;
	struct rfkill *bt_rfk;
	struct input_dev *hotkey_dev;
	struct work_struct hotkey_work;
	struct backlight_device *backlight_dev;
	struct led_classdev led_dev;

	int force_fan;
	int last_key_event;
	int key_event_valid;

	unsigned int illumination_supported:1;
	unsigned int video_supported:1;
	unsigned int fan_supported:1;
	unsigned int system_event_supported:1;
	unsigned int ntfy_supported:1;
	unsigned int info_supported:1;

	struct mutex mutex;
};

static struct toshiba_acpi_dev *toshiba_acpi;

static const struct acpi_device_id toshiba_device_ids[] = {
	{"TOS6200", 0},
	{"TOS6208", 0},
	{"TOS1900", 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, toshiba_device_ids);

static const struct key_entry toshiba_acpi_keymap[] __devinitconst = {
	{ KE_KEY, 0x101, { KEY_MUTE } },
	{ KE_KEY, 0x102, { KEY_ZOOMOUT } },
	{ KE_KEY, 0x103, { KEY_ZOOMIN } },
	{ KE_KEY, 0x12c, { KEY_KBDILLUMTOGGLE } },
	{ KE_KEY, 0x139, { KEY_ZOOMRESET } },
	{ KE_KEY, 0x13b, { KEY_COFFEE } },
	{ KE_KEY, 0x13c, { KEY_BATTERY } },
	{ KE_KEY, 0x13d, { KEY_SLEEP } },
	{ KE_KEY, 0x13e, { KEY_SUSPEND } },
	{ KE_KEY, 0x13f, { KEY_SWITCHVIDEOMODE } },
	{ KE_KEY, 0x140, { KEY_BRIGHTNESSDOWN } },
	{ KE_KEY, 0x141, { KEY_BRIGHTNESSUP } },
	{ KE_KEY, 0x142, { KEY_WLAN } },
	{ KE_KEY, 0x143, { KEY_TOUCHPAD_TOGGLE } },
	{ KE_KEY, 0x17f, { KEY_FN } },
	{ KE_KEY, 0xb05, { KEY_PROG2 } },
	{ KE_KEY, 0xb06, { KEY_WWW } },
	{ KE_KEY, 0xb07, { KEY_MAIL } },
	{ KE_KEY, 0xb30, { KEY_STOP } },
	{ KE_KEY, 0xb31, { KEY_PREVIOUSSONG } },
	{ KE_KEY, 0xb32, { KEY_NEXTSONG } },
	{ KE_KEY, 0xb33, { KEY_PLAYPAUSE } },
	{ KE_KEY, 0xb5a, { KEY_MEDIA } },
	{ KE_IGNORE, 0x1430, { KEY_RESERVED } },
	{ KE_END, 0 },
};

/* utility
 */

static __inline__ void _set_bit(u32 * word, u32 mask, int value)
{
	*word = (*word & ~mask) | (mask * value);
}

/* acpi interface wrappers
 */

static int write_acpi_int(const char *methodName, int val)
{
	struct acpi_object_list params;
	union acpi_object in_objs[1];
	acpi_status status;

	params.count = ARRAY_SIZE(in_objs);
	params.pointer = in_objs;
	in_objs[0].type = ACPI_TYPE_INTEGER;
	in_objs[0].integer.value = val;

	status = acpi_evaluate_object(NULL, (char *)methodName, &params, NULL);
	return (status == AE_OK) ? 0 : -EIO;
}

/* Perform a raw HCI call.  Here we don't care about input or output buffer
 * format.
 */
static acpi_status hci_raw(struct toshiba_acpi_dev *dev,
			   const u32 in[HCI_WORDS], u32 out[HCI_WORDS])
{
	struct acpi_object_list params;
	union acpi_object in_objs[HCI_WORDS];
	struct acpi_buffer results;
	union acpi_object out_objs[HCI_WORDS + 1];
	acpi_status status;
	int i;

	params.count = HCI_WORDS;
	params.pointer = in_objs;
	for (i = 0; i < HCI_WORDS; ++i) {
		in_objs[i].type = ACPI_TYPE_INTEGER;
		in_objs[i].integer.value = in[i];
	}

	results.length = sizeof(out_objs);
	results.pointer = out_objs;

	status = acpi_evaluate_object(dev->acpi_dev->handle,
				      (char *)dev->method_hci, &params,
				      &results);
	if ((status == AE_OK) && (out_objs->package.count <= HCI_WORDS)) {
		for (i = 0; i < out_objs->package.count; ++i) {
			out[i] = out_objs->package.elements[i].integer.value;
		}
	}

	return status;
}

/* common hci tasks (get or set one or two value)
 *
 * In addition to the ACPI status, the HCI system returns a result which
 * may be useful (such as "not supported").
 */

static acpi_status hci_write1(struct toshiba_acpi_dev *dev, u32 reg,
			      u32 in1, u32 *result)
{
	u32 in[HCI_WORDS] = { HCI_SET, reg, in1, 0, 0, 0 };
	u32 out[HCI_WORDS];
	acpi_status status = hci_raw(dev, in, out);
	*result = (status == AE_OK) ? out[0] : HCI_FAILURE;
	return status;
}

static acpi_status hci_read1(struct toshiba_acpi_dev *dev, u32 reg,
			     u32 *out1, u32 *result)
{
	u32 in[HCI_WORDS] = { HCI_GET, reg, 0, 0, 0, 0 };
	u32 out[HCI_WORDS];
	acpi_status status = hci_raw(dev, in, out);
	*out1 = out[2];
	*result = (status == AE_OK) ? out[0] : HCI_FAILURE;
	return status;
}

static acpi_status hci_write2(struct toshiba_acpi_dev *dev, u32 reg,
			      u32 in1, u32 in2, u32 *result)
{
	u32 in[HCI_WORDS] = { HCI_SET, reg, in1, in2, 0, 0 };
	u32 out[HCI_WORDS];
	acpi_status status = hci_raw(dev, in, out);
	*result = (status == AE_OK) ? out[0] : HCI_FAILURE;
	return status;
}

static acpi_status hci_read2(struct toshiba_acpi_dev *dev, u32 reg,
			     u32 *out1, u32 *out2, u32 *result)
{
	u32 in[HCI_WORDS] = { HCI_GET, reg, *out1, *out2, 0, 0 };
	u32 out[HCI_WORDS];
	acpi_status status = hci_raw(dev, in, out);
	*out1 = out[2];
	*out2 = out[3];
	*result = (status == AE_OK) ? out[0] : HCI_FAILURE;
	return status;
}

/* Illumination support */
static int toshiba_illumination_available(struct toshiba_acpi_dev *dev)
{
	u32 in[HCI_WORDS] = { 0, 0, 0, 0, 0, 0 };
	u32 out[HCI_WORDS];
	acpi_status status;

	in[0] = 0xf100;
	status = hci_raw(dev, in, out);
	if (ACPI_FAILURE(status)) {
		pr_info("Illumination device not available\n");
		return 0;
	}
	in[0] = 0xf400;
	status = hci_raw(dev, in, out);
	return 1;
}

static void toshiba_illumination_set(struct led_classdev *cdev,
				     enum led_brightness brightness)
{
	struct toshiba_acpi_dev *dev = container_of(cdev,
			struct toshiba_acpi_dev, led_dev);
	u32 in[HCI_WORDS] = { 0, 0, 0, 0, 0, 0 };
	u32 out[HCI_WORDS];
	acpi_status status;

	/* First request : initialize communication. */
	in[0] = 0xf100;
	status = hci_raw(dev, in, out);
	if (ACPI_FAILURE(status)) {
		pr_info("Illumination device not available\n");
		return;
	}

	if (brightness) {
		/* Switch the illumination on */
		in[0] = 0xf400;
		in[1] = 0x14e;
		in[2] = 1;
		status = hci_raw(dev, in, out);
		if (ACPI_FAILURE(status)) {
			pr_info("ACPI call for illumination failed\n");
			return;
		}
	} else {
		/* Switch the illumination off */
		in[0] = 0xf400;
		in[1] = 0x14e;
		in[2] = 0;
		status = hci_raw(dev, in, out);
		if (ACPI_FAILURE(status)) {
			pr_info("ACPI call for illumination failed.\n");
			return;
		}
	}

	/* Last request : close communication. */
	in[0] = 0xf200;
	in[1] = 0;
	in[2] = 0;
	hci_raw(dev, in, out);
}

static enum led_brightness toshiba_illumination_get(struct led_classdev *cdev)
{
	struct toshiba_acpi_dev *dev = container_of(cdev,
			struct toshiba_acpi_dev, led_dev);
	u32 in[HCI_WORDS] = { 0, 0, 0, 0, 0, 0 };
	u32 out[HCI_WORDS];
	acpi_status status;
	enum led_brightness result;

	/* First request : initialize communication. */
	in[0] = 0xf100;
	status = hci_raw(dev, in, out);
	if (ACPI_FAILURE(status)) {
		pr_info("Illumination device not available\n");
		return LED_OFF;
	}

	/* Check the illumination */
	in[0] = 0xf300;
	in[1] = 0x14e;
	status = hci_raw(dev, in, out);
	if (ACPI_FAILURE(status)) {
		pr_info("ACPI call for illumination failed.\n");
		return LED_OFF;
	}

	result = out[2] ? LED_FULL : LED_OFF;

	/* Last request : close communication. */
	in[0] = 0xf200;
	in[1] = 0;
	in[2] = 0;
	hci_raw(dev, in, out);

	return result;
}

/* Bluetooth rfkill handlers */

static u32 hci_get_bt_present(struct toshiba_acpi_dev *dev, bool *present)
{
	u32 hci_result;
	u32 value, value2;

	value = 0;
	value2 = 0;
	hci_read2(dev, HCI_WIRELESS, &value, &value2, &hci_result);
	if (hci_result == HCI_SUCCESS)
		*present = (value & HCI_WIRELESS_BT_PRESENT) ? true : false;

	return hci_result;
}

static u32 hci_get_radio_state(struct toshiba_acpi_dev *dev, bool *radio_state)
{
	u32 hci_result;
	u32 value, value2;

	value = 0;
	value2 = 0x0001;
	hci_read2(dev, HCI_WIRELESS, &value, &value2, &hci_result);

	*radio_state = value & HCI_WIRELESS_KILL_SWITCH;
	return hci_result;
}

static int bt_rfkill_set_block(void *data, bool blocked)
{
	struct toshiba_acpi_dev *dev = data;
	u32 result1, result2;
	u32 value;
	int err;
	bool radio_state;

	value = (blocked == false);

	mutex_lock(&dev->mutex);
	if (hci_get_radio_state(dev, &radio_state) != HCI_SUCCESS) {
		err = -EIO;
		goto out;
	}

	if (!radio_state) {
		err = 0;
		goto out;
	}

	hci_write2(dev, HCI_WIRELESS, value, HCI_WIRELESS_BT_POWER, &result1);
	hci_write2(dev, HCI_WIRELESS, value, HCI_WIRELESS_BT_ATTACH, &result2);

	if (result1 != HCI_SUCCESS || result2 != HCI_SUCCESS)
		err = -EIO;
	else
		err = 0;
 out:
	mutex_unlock(&dev->mutex);
	return err;
}

static void bt_rfkill_poll(struct rfkill *rfkill, void *data)
{
	bool new_rfk_state;
	bool value;
	u32 hci_result;
	struct toshiba_acpi_dev *dev = data;

	mutex_lock(&dev->mutex);

	hci_result = hci_get_radio_state(dev, &value);
	if (hci_result != HCI_SUCCESS) {
		/* Can't do anything useful */
		mutex_unlock(&dev->mutex);
		return;
	}

	new_rfk_state = value;

	mutex_unlock(&dev->mutex);

	if (rfkill_set_hw_state(rfkill, !new_rfk_state))
		bt_rfkill_set_block(data, true);
}

static const struct rfkill_ops toshiba_rfk_ops = {
	.set_block = bt_rfkill_set_block,
	.poll = bt_rfkill_poll,
};

static struct proc_dir_entry *toshiba_proc_dir /*= 0*/ ;

static int get_lcd(struct backlight_device *bd)
{
	struct toshiba_acpi_dev *dev = bl_get_data(bd);
	u32 hci_result;
	u32 value;

	hci_read1(dev, HCI_LCD_BRIGHTNESS, &value, &hci_result);
	if (hci_result == HCI_SUCCESS)
		return (value >> HCI_LCD_BRIGHTNESS_SHIFT);

	return -EIO;
}

static int lcd_proc_show(struct seq_file *m, void *v)
{
	struct toshiba_acpi_dev *dev = m->private;
	int value;

	if (!dev->backlight_dev)
		return -ENODEV;

	value = get_lcd(dev->backlight_dev);
	if (value >= 0) {
		seq_printf(m, "brightness:              %d\n", value);
		seq_printf(m, "brightness_levels:       %d\n",
			     HCI_LCD_BRIGHTNESS_LEVELS);
		return 0;
	}

	pr_err("Error reading LCD brightness\n");
	return -EIO;
}

static int lcd_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, lcd_proc_show, PDE(inode)->data);
}

static int set_lcd(struct toshiba_acpi_dev *dev, int value)
{
	u32 hci_result;

	value = value << HCI_LCD_BRIGHTNESS_SHIFT;
	hci_write1(dev, HCI_LCD_BRIGHTNESS, value, &hci_result);
	return hci_result == HCI_SUCCESS ? 0 : -EIO;
}

static int set_lcd_status(struct backlight_device *bd)
{
	struct toshiba_acpi_dev *dev = bl_get_data(bd);
	return set_lcd(dev, bd->props.brightness);
}

static ssize_t lcd_proc_write(struct file *file, const char __user *buf,
			      size_t count, loff_t *pos)
{
	struct toshiba_acpi_dev *dev = PDE(file->f_path.dentry->d_inode)->data;
	char cmd[42];
	size_t len;
	int value;
	int ret;

	len = min(count, sizeof(cmd) - 1);
	if (copy_from_user(cmd, buf, len))
		return -EFAULT;
	cmd[len] = '\0';

	if (sscanf(cmd, " brightness : %i", &value) == 1 &&
	    value >= 0 && value < HCI_LCD_BRIGHTNESS_LEVELS) {
		ret = set_lcd(dev, value);
		if (ret == 0)
			ret = count;
	} else {
		ret = -EINVAL;
	}
	return ret;
}

static const struct file_operations lcd_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= lcd_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= lcd_proc_write,
};

static int get_video_status(struct toshiba_acpi_dev *dev, u32 *status)
{
	u32 hci_result;

	hci_read1(dev, HCI_VIDEO_OUT, status, &hci_result);
	return hci_result == HCI_SUCCESS ? 0 : -EIO;
}

static int video_proc_show(struct seq_file *m, void *v)
{
	struct toshiba_acpi_dev *dev = m->private;
	u32 value;
	int ret;

	ret = get_video_status(dev, &value);
	if (!ret) {
		int is_lcd = (value & HCI_VIDEO_OUT_LCD) ? 1 : 0;
		int is_crt = (value & HCI_VIDEO_OUT_CRT) ? 1 : 0;
		int is_tv = (value & HCI_VIDEO_OUT_TV) ? 1 : 0;
		seq_printf(m, "lcd_out:                 %d\n", is_lcd);
		seq_printf(m, "crt_out:                 %d\n", is_crt);
		seq_printf(m, "tv_out:                  %d\n", is_tv);
	}

	return ret;
}

static int video_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, video_proc_show, PDE(inode)->data);
}

static ssize_t video_proc_write(struct file *file, const char __user *buf,
				size_t count, loff_t *pos)
{
	struct toshiba_acpi_dev *dev = PDE(file->f_path.dentry->d_inode)->data;
	char *cmd, *buffer;
	int ret;
	int value;
	int remain = count;
	int lcd_out = -1;
	int crt_out = -1;
	int tv_out = -1;
	u32 video_out;

	cmd = kmalloc(count + 1, GFP_KERNEL);
	if (!cmd)
		return -ENOMEM;
	if (copy_from_user(cmd, buf, count)) {
		kfree(cmd);
		return -EFAULT;
	}
	cmd[count] = '\0';

	buffer = cmd;

	/* scan expression.  Multiple expressions may be delimited with ;
	 *
	 *  NOTE: to keep scanning simple, invalid fields are ignored
	 */
	while (remain) {
		if (sscanf(buffer, " lcd_out : %i", &value) == 1)
			lcd_out = value & 1;
		else if (sscanf(buffer, " crt_out : %i", &value) == 1)
			crt_out = value & 1;
		else if (sscanf(buffer, " tv_out : %i", &value) == 1)
			tv_out = value & 1;
		/* advance to one character past the next ; */
		do {
			++buffer;
			--remain;
		}
		while (remain && *(buffer - 1) != ';');
	}

	kfree(cmd);

	ret = get_video_status(dev, &video_out);
	if (!ret) {
		unsigned int new_video_out = video_out;
		if (lcd_out != -1)
			_set_bit(&new_video_out, HCI_VIDEO_OUT_LCD, lcd_out);
		if (crt_out != -1)
			_set_bit(&new_video_out, HCI_VIDEO_OUT_CRT, crt_out);
		if (tv_out != -1)
			_set_bit(&new_video_out, HCI_VIDEO_OUT_TV, tv_out);
		/* To avoid unnecessary video disruption, only write the new
		 * video setting if something changed. */
		if (new_video_out != video_out)
			ret = write_acpi_int(METHOD_VIDEO_OUT, new_video_out);
	}

	return ret ? ret : count;
}

static const struct file_operations video_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= video_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= video_proc_write,
};

static int get_fan_status(struct toshiba_acpi_dev *dev, u32 *status)
{
	u32 hci_result;

	hci_read1(dev, HCI_FAN, status, &hci_result);
	return hci_result == HCI_SUCCESS ? 0 : -EIO;
}

static int fan_proc_show(struct seq_file *m, void *v)
{
	struct toshiba_acpi_dev *dev = m->private;
	int ret;
	u32 value;

	ret = get_fan_status(dev, &value);
	if (!ret) {
		seq_printf(m, "running:                 %d\n", (value > 0));
		seq_printf(m, "force_on:                %d\n", dev->force_fan);
	}

	return ret;
}

static int fan_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, fan_proc_show, PDE(inode)->data);
}

static ssize_t fan_proc_write(struct file *file, const char __user *buf,
			      size_t count, loff_t *pos)
{
	struct toshiba_acpi_dev *dev = PDE(file->f_path.dentry->d_inode)->data;
	char cmd[42];
	size_t len;
	int value;
	u32 hci_result;

	len = min(count, sizeof(cmd) - 1);
	if (copy_from_user(cmd, buf, len))
		return -EFAULT;
	cmd[len] = '\0';

	if (sscanf(cmd, " force_on : %i", &value) == 1 &&
	    value >= 0 && value <= 1) {
		hci_write1(dev, HCI_FAN, value, &hci_result);
		if (hci_result != HCI_SUCCESS)
			return -EIO;
		else
			dev->force_fan = value;
	} else {
		return -EINVAL;
	}

	return count;
}

static const struct file_operations fan_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= fan_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= fan_proc_write,
};

static int keys_proc_show(struct seq_file *m, void *v)
{
	struct toshiba_acpi_dev *dev = m->private;
	u32 hci_result;
	u32 value;

	if (!dev->key_event_valid && dev->system_event_supported) {
		hci_read1(dev, HCI_SYSTEM_EVENT, &value, &hci_result);
		if (hci_result == HCI_SUCCESS) {
			dev->key_event_valid = 1;
			dev->last_key_event = value;
		} else if (hci_result == HCI_EMPTY) {
			/* better luck next time */
		} else if (hci_result == HCI_NOT_SUPPORTED) {
			/* This is a workaround for an unresolved issue on
			 * some machines where system events sporadically
			 * become disabled. */
			hci_write1(dev, HCI_SYSTEM_EVENT, 1, &hci_result);
			pr_notice("Re-enabled hotkeys\n");
		} else {
			pr_err("Error reading hotkey status\n");
			return -EIO;
		}
	}

	seq_printf(m, "hotkey_ready:            %d\n", dev->key_event_valid);
	seq_printf(m, "hotkey:                  0x%04x\n", dev->last_key_event);
	return 0;
}

static int keys_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, keys_proc_show, PDE(inode)->data);
}

static ssize_t keys_proc_write(struct file *file, const char __user *buf,
			       size_t count, loff_t *pos)
{
	struct toshiba_acpi_dev *dev = PDE(file->f_path.dentry->d_inode)->data;
	char cmd[42];
	size_t len;
	int value;

	len = min(count, sizeof(cmd) - 1);
	if (copy_from_user(cmd, buf, len))
		return -EFAULT;
	cmd[len] = '\0';

	if (sscanf(cmd, " hotkey_ready : %i", &value) == 1 && value == 0) {
		dev->key_event_valid = 0;
	} else {
		return -EINVAL;
	}

	return count;
}

static const struct file_operations keys_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= keys_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= keys_proc_write,
};

static int version_proc_show(struct seq_file *m, void *v)
{
	seq_printf(m, "driver:                  %s\n", TOSHIBA_ACPI_VERSION);
	seq_printf(m, "proc_interface:          %d\n", PROC_INTERFACE_VERSION);
	return 0;
}

static int version_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, version_proc_show, PDE(inode)->data);
}

static const struct file_operations version_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= version_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

/* proc and module init
 */

#define PROC_TOSHIBA		"toshiba"

static void __devinit
create_toshiba_proc_entries(struct toshiba_acpi_dev *dev)
{
	if (dev->backlight_dev)
		proc_create_data("lcd", S_IRUGO | S_IWUSR, toshiba_proc_dir,
				 &lcd_proc_fops, dev);
	if (dev->video_supported)
		proc_create_data("video", S_IRUGO | S_IWUSR, toshiba_proc_dir,
				 &video_proc_fops, dev);
	if (dev->fan_supported)
		proc_create_data("fan", S_IRUGO | S_IWUSR, toshiba_proc_dir,
				 &fan_proc_fops, dev);
	if (dev->hotkey_dev)
		proc_create_data("keys", S_IRUGO | S_IWUSR, toshiba_proc_dir,
				 &keys_proc_fops, dev);
	proc_create_data("version", S_IRUGO, toshiba_proc_dir,
			 &version_proc_fops, dev);
}

static void remove_toshiba_proc_entries(struct toshiba_acpi_dev *dev)
{
	if (dev->backlight_dev)
		remove_proc_entry("lcd", toshiba_proc_dir);
	if (dev->video_supported)
		remove_proc_entry("video", toshiba_proc_dir);
	if (dev->fan_supported)
		remove_proc_entry("fan", toshiba_proc_dir);
	if (dev->hotkey_dev)
		remove_proc_entry("keys", toshiba_proc_dir);
	remove_proc_entry("version", toshiba_proc_dir);
}

static const struct backlight_ops toshiba_backlight_data = {
        .get_brightness = get_lcd,
        .update_status  = set_lcd_status,
};

static bool toshiba_acpi_i8042_filter(unsigned char data, unsigned char str,
				      struct serio *port)
{
	if (str & 0x20)
		return false;

	if (unlikely(data == 0xe0))
		return false;

	if ((data & 0x7f) == TOS1900_FN_SCAN) {
		schedule_work(&toshiba_acpi->hotkey_work);
		return true;
	}

	return false;
}

static void toshiba_acpi_hotkey_work(struct work_struct *work)
{
	acpi_handle ec_handle = ec_get_handle();
	acpi_status status;

	if (!ec_handle)
		return;

	status = acpi_evaluate_object(ec_handle, "NTFY", NULL, NULL);
	if (ACPI_FAILURE(status))
		pr_err("ACPI NTFY method execution failed\n");
}

/*
 * Returns hotkey scancode, or < 0 on failure.
 */
static int toshiba_acpi_query_hotkey(struct toshiba_acpi_dev *dev)
{
	struct acpi_buffer buf;
	union acpi_object out_obj;
	acpi_status status;

	buf.pointer = &out_obj;
	buf.length = sizeof(out_obj);

	status = acpi_evaluate_object(dev->acpi_dev->handle, "INFO",
				      NULL, &buf);
	if (ACPI_FAILURE(status) || out_obj.type != ACPI_TYPE_INTEGER) {
		pr_err("ACPI INFO method execution failed\n");
		return -EIO;
	}

	return out_obj.integer.value;
}

static void toshiba_acpi_report_hotkey(struct toshiba_acpi_dev *dev,
				       int scancode)
{
	if (scancode == 0x100)
		return;

	/* act on key press; ignore key release */
	if (scancode & 0x80)
		return;

	if (!sparse_keymap_report_event(dev->hotkey_dev, scancode, 1, true))
		pr_info("Unknown key %x\n", scancode);
}

static int __devinit toshiba_acpi_setup_keyboard(struct toshiba_acpi_dev *dev)
{
	acpi_status status;
	acpi_handle ec_handle, handle;
	int error;
	u32 hci_result;

	dev->hotkey_dev = input_allocate_device();
	if (!dev->hotkey_dev) {
		pr_info("Unable to register input device\n");
		return -ENOMEM;
	}

	dev->hotkey_dev->name = "Toshiba input device";
	dev->hotkey_dev->phys = "toshiba_acpi/input0";
	dev->hotkey_dev->id.bustype = BUS_HOST;

	error = sparse_keymap_setup(dev->hotkey_dev, toshiba_acpi_keymap, NULL);
	if (error)
		goto err_free_dev;

	/*
	 * For some machines the SCI responsible for providing hotkey
	 * notification doesn't fire. We can trigger the notification
	 * whenever the Fn key is pressed using the NTFY method, if
	 * supported, so if it's present set up an i8042 key filter
	 * for this purpose.
	 */
	status = AE_ERROR;
	ec_handle = ec_get_handle();
	if (ec_handle)
		status = acpi_get_handle(ec_handle, "NTFY", &handle);

	if (ACPI_SUCCESS(status)) {
		INIT_WORK(&dev->hotkey_work, toshiba_acpi_hotkey_work);

		error = i8042_install_filter(toshiba_acpi_i8042_filter);
		if (error) {
			pr_err("Error installing key filter\n");
			goto err_free_keymap;
		}

		dev->ntfy_supported = 1;
	}

	/*
	 * Determine hotkey query interface. Prefer using the INFO
	 * method when it is available.
	 */
	status = acpi_get_handle(dev->acpi_dev->handle, "INFO", &handle);
	if (ACPI_SUCCESS(status)) {
		dev->info_supported = 1;
	} else {
		hci_write1(dev, HCI_SYSTEM_EVENT, 1, &hci_result);
		if (hci_result == HCI_SUCCESS)
			dev->system_event_supported = 1;
	}

	if (!dev->info_supported && !dev->system_event_supported) {
		pr_warn("No hotkey query interface found\n");
		goto err_remove_filter;
	}

	status = acpi_evaluate_object(dev->acpi_dev->handle, "ENAB", NULL, NULL);
	if (ACPI_FAILURE(status)) {
		pr_info("Unable to enable hotkeys\n");
		error = -ENODEV;
		goto err_remove_filter;
	}

	error = input_register_device(dev->hotkey_dev);
	if (error) {
		pr_info("Unable to register input device\n");
		goto err_remove_filter;
	}

	hci_write1(dev, HCI_HOTKEY_EVENT, HCI_HOTKEY_ENABLE, &hci_result);
	return 0;

 err_remove_filter:
	if (dev->ntfy_supported)
		i8042_remove_filter(toshiba_acpi_i8042_filter);
 err_free_keymap:
	sparse_keymap_free(dev->hotkey_dev);
 err_free_dev:
	input_free_device(dev->hotkey_dev);
	dev->hotkey_dev = NULL;
	return error;
}

static int toshiba_acpi_remove(struct acpi_device *acpi_dev, int type)
{
	struct toshiba_acpi_dev *dev = acpi_driver_data(acpi_dev);

	remove_toshiba_proc_entries(dev);

	if (dev->ntfy_supported) {
		i8042_remove_filter(toshiba_acpi_i8042_filter);
		cancel_work_sync(&dev->hotkey_work);
	}

	if (dev->hotkey_dev) {
		input_unregister_device(dev->hotkey_dev);
		sparse_keymap_free(dev->hotkey_dev);
	}

	if (dev->bt_rfk) {
		rfkill_unregister(dev->bt_rfk);
		rfkill_destroy(dev->bt_rfk);
	}

	if (dev->backlight_dev)
		backlight_device_unregister(dev->backlight_dev);

	if (dev->illumination_supported)
		led_classdev_unregister(&dev->led_dev);

	if (toshiba_acpi)
		toshiba_acpi = NULL;

	kfree(dev);

	return 0;
}

static const char * __devinit find_hci_method(acpi_handle handle)
{
	acpi_status status;
	acpi_handle hci_handle;

	status = acpi_get_handle(handle, "GHCI", &hci_handle);
	if (ACPI_SUCCESS(status))
		return "GHCI";

	status = acpi_get_handle(handle, "SPFC", &hci_handle);
	if (ACPI_SUCCESS(status))
		return "SPFC";

	return NULL;
}

static int __devinit toshiba_acpi_add(struct acpi_device *acpi_dev)
{
	struct toshiba_acpi_dev *dev;
	const char *hci_method;
	u32 dummy;
	bool bt_present;
	int ret = 0;
	struct backlight_properties props;

	if (toshiba_acpi)
		return -EBUSY;

	pr_info("Toshiba Laptop ACPI Extras version %s\n",
	       TOSHIBA_ACPI_VERSION);

	hci_method = find_hci_method(acpi_dev->handle);
	if (!hci_method) {
		pr_err("HCI interface not found\n");
		return -ENODEV;
	}

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return -ENOMEM;
	dev->acpi_dev = acpi_dev;
	dev->method_hci = hci_method;
	acpi_dev->driver_data = dev;

	if (toshiba_acpi_setup_keyboard(dev))
		pr_info("Unable to activate hotkeys\n");

	mutex_init(&dev->mutex);

	props.type = BACKLIGHT_PLATFORM;
	props.max_brightness = HCI_LCD_BRIGHTNESS_LEVELS - 1;
	dev->backlight_dev = backlight_device_register("toshiba",
						       &acpi_dev->dev,
						       dev,
						       &toshiba_backlight_data,
						       &props);
	if (IS_ERR(dev->backlight_dev)) {
		ret = PTR_ERR(dev->backlight_dev);

		pr_err("Could not register toshiba backlight device\n");
		dev->backlight_dev = NULL;
		goto error;
	}
	dev->backlight_dev->props.brightness = get_lcd(dev->backlight_dev);

	/* Register rfkill switch for Bluetooth */
	if (hci_get_bt_present(dev, &bt_present) == HCI_SUCCESS && bt_present) {
		dev->bt_rfk = rfkill_alloc("Toshiba Bluetooth",
					   &acpi_dev->dev,
					   RFKILL_TYPE_BLUETOOTH,
					   &toshiba_rfk_ops,
					   dev);
		if (!dev->bt_rfk) {
			pr_err("unable to allocate rfkill device\n");
			ret = -ENOMEM;
			goto error;
		}

		ret = rfkill_register(dev->bt_rfk);
		if (ret) {
			pr_err("unable to register rfkill device\n");
			rfkill_destroy(dev->bt_rfk);
			goto error;
		}
	}

	if (toshiba_illumination_available(dev)) {
		dev->led_dev.name = "toshiba::illumination";
		dev->led_dev.max_brightness = 1;
		dev->led_dev.brightness_set = toshiba_illumination_set;
		dev->led_dev.brightness_get = toshiba_illumination_get;
		if (!led_classdev_register(&acpi_dev->dev, &dev->led_dev))
			dev->illumination_supported = 1;
	}

	/* Determine whether or not BIOS supports fan and video interfaces */

	ret = get_video_status(dev, &dummy);
	dev->video_supported = !ret;

	ret = get_fan_status(dev, &dummy);
	dev->fan_supported = !ret;

	create_toshiba_proc_entries(dev);

	toshiba_acpi = dev;

	return 0;

error:
	toshiba_acpi_remove(acpi_dev, 0);
	return ret;
}

static void toshiba_acpi_notify(struct acpi_device *acpi_dev, u32 event)
{
	struct toshiba_acpi_dev *dev = acpi_driver_data(acpi_dev);
	u32 hci_result, value;
	int retries = 3;
	int scancode;

	if (event != 0x80)
		return;

	if (dev->info_supported) {
		scancode = toshiba_acpi_query_hotkey(dev);
		if (scancode < 0)
			pr_err("Failed to query hotkey event\n");
		else if (scancode != 0)
			toshiba_acpi_report_hotkey(dev, scancode);
	} else if (dev->system_event_supported) {
		do {
			hci_read1(dev, HCI_SYSTEM_EVENT, &value, &hci_result);
			switch (hci_result) {
			case HCI_SUCCESS:
				toshiba_acpi_report_hotkey(dev, (int)value);
				break;
			case HCI_NOT_SUPPORTED:
				/*
				 * This is a workaround for an unresolved
				 * issue on some machines where system events
				 * sporadically become disabled.
				 */
				hci_write1(dev, HCI_SYSTEM_EVENT, 1,
					   &hci_result);
				pr_notice("Re-enabled hotkeys\n");
				/* fall through */
			default:
				retries--;
				break;
			}
		} while (retries && hci_result != HCI_EMPTY);
	}
}

static int toshiba_acpi_suspend(struct acpi_device *acpi_dev,
				pm_message_t state)
{
	struct toshiba_acpi_dev *dev = acpi_driver_data(acpi_dev);
	u32 result;

	if (dev->hotkey_dev)
		hci_write1(dev, HCI_HOTKEY_EVENT, HCI_HOTKEY_DISABLE, &result);

	return 0;
}

static int toshiba_acpi_resume(struct acpi_device *acpi_dev)
{
	struct toshiba_acpi_dev *dev = acpi_driver_data(acpi_dev);
	u32 result;

	if (dev->hotkey_dev)
		hci_write1(dev, HCI_HOTKEY_EVENT, HCI_HOTKEY_ENABLE, &result);

	return 0;
}

static struct acpi_driver toshiba_acpi_driver = {
	.name	= "Toshiba ACPI driver",
	.owner	= THIS_MODULE,
	.ids	= toshiba_device_ids,
	.flags	= ACPI_DRIVER_ALL_NOTIFY_EVENTS,
	.ops	= {
		.add		= toshiba_acpi_add,
		.remove		= toshiba_acpi_remove,
		.notify		= toshiba_acpi_notify,
		.suspend	= toshiba_acpi_suspend,
		.resume		= toshiba_acpi_resume,
	},
};

static int __init toshiba_acpi_init(void)
{
	int ret;

	/*
	 * Machines with this WMI guid aren't supported due to bugs in
	 * their AML. This check relies on wmi initializing before
	 * toshiba_acpi to guarantee guids have been identified.
	 */
	if (wmi_has_guid(TOSHIBA_WMI_EVENT_GUID))
		return -ENODEV;

	toshiba_proc_dir = proc_mkdir(PROC_TOSHIBA, acpi_root_dir);
	if (!toshiba_proc_dir) {
		pr_err("Unable to create proc dir " PROC_TOSHIBA "\n");
		return -ENODEV;
	}

	ret = acpi_bus_register_driver(&toshiba_acpi_driver);
	if (ret) {
		pr_err("Failed to register ACPI driver: %d\n", ret);
		remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);
	}

	return ret;
}

static void __exit toshiba_acpi_exit(void)
{
	acpi_bus_unregister_driver(&toshiba_acpi_driver);
	if (toshiba_proc_dir)
		remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);
}

module_init(toshiba_acpi_init);
module_exit(toshiba_acpi_exit);