summaryrefslogtreecommitdiffstats
path: root/drivers/misc/acer-wmi.c
blob: 94c9f911824ef5b3279205a41a87dd169935f1db (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
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
/*
 *  Acer WMI Laptop Extras
 *
 *  Copyright (C) 2007-2008	Carlos Corbacho <carlos@strangeworlds.co.uk>
 *
 *  Based on acer_acpi:
 *    Copyright (C) 2005-2007	E.M. Smith
 *    Copyright (C) 2007-2008	Carlos Corbacho <cathectic@gmail.com>
 *
 *  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
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/dmi.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/leds.h>
#include <linux/platform_device.h>
#include <linux/acpi.h>
#include <linux/i8042.h>
#include <linux/rfkill.h>
#include <linux/workqueue.h>
#include <linux/debugfs.h>

#include <acpi/acpi_drivers.h>

MODULE_AUTHOR("Carlos Corbacho");
MODULE_DESCRIPTION("Acer Laptop WMI Extras Driver");
MODULE_LICENSE("GPL");

#define ACER_LOGPREFIX "acer-wmi: "
#define ACER_ERR KERN_ERR ACER_LOGPREFIX
#define ACER_NOTICE KERN_NOTICE ACER_LOGPREFIX
#define ACER_INFO KERN_INFO ACER_LOGPREFIX

/*
 * The following defines quirks to get some specific functions to work
 * which are known to not be supported over ACPI-WMI (such as the mail LED
 * on WMID based Acer's)
 */
struct acer_quirks {
	const char *vendor;
	const char *model;
	u16 quirks;
};

/*
 * Magic Number
 * Meaning is unknown - this number is required for writing to ACPI for AMW0
 * (it's also used in acerhk when directly accessing the BIOS)
 */
#define ACER_AMW0_WRITE	0x9610

/*
 * Bit masks for the AMW0 interface
 */
#define ACER_AMW0_WIRELESS_MASK  0x35
#define ACER_AMW0_BLUETOOTH_MASK 0x34
#define ACER_AMW0_MAILLED_MASK   0x31

/*
 * Method IDs for WMID interface
 */
#define ACER_WMID_GET_WIRELESS_METHODID		1
#define ACER_WMID_GET_BLUETOOTH_METHODID	2
#define ACER_WMID_GET_BRIGHTNESS_METHODID	3
#define ACER_WMID_SET_WIRELESS_METHODID		4
#define ACER_WMID_SET_BLUETOOTH_METHODID	5
#define ACER_WMID_SET_BRIGHTNESS_METHODID	6
#define ACER_WMID_GET_THREEG_METHODID		10
#define ACER_WMID_SET_THREEG_METHODID		11

/*
 * Acer ACPI method GUIDs
 */
#define AMW0_GUID1		"67C3371D-95A3-4C37-BB61-DD47B491DAAB"
#define AMW0_GUID2		"431F16ED-0C2B-444C-B267-27DEB140CF9C"
#define WMID_GUID1		"6AF4F258-B401-42fd-BE91-3D4AC2D7C0D3"
#define WMID_GUID2		"95764E09-FB56-4e83-B31A-37761F60994A"

MODULE_ALIAS("wmi:67C3371D-95A3-4C37-BB61-DD47B491DAAB");
MODULE_ALIAS("wmi:6AF4F258-B401-42fd-BE91-3D4AC2D7C0D3");

/* Temporary workaround until the WMI sysfs interface goes in */
MODULE_ALIAS("dmi:*:*Acer*:*:");

/*
 * Interface capability flags
 */
#define ACER_CAP_MAILLED		(1<<0)
#define ACER_CAP_WIRELESS		(1<<1)
#define ACER_CAP_BLUETOOTH		(1<<2)
#define ACER_CAP_BRIGHTNESS		(1<<3)
#define ACER_CAP_THREEG			(1<<4)
#define ACER_CAP_ANY			(0xFFFFFFFF)

/*
 * Interface type flags
 */
enum interface_flags {
	ACER_AMW0,
	ACER_AMW0_V2,
	ACER_WMID,
};

#define ACER_DEFAULT_WIRELESS  0
#define ACER_DEFAULT_BLUETOOTH 0
#define ACER_DEFAULT_MAILLED   0
#define ACER_DEFAULT_THREEG    0

static int max_brightness = 0xF;

static int mailled = -1;
static int brightness = -1;
static int threeg = -1;
static int force_series;

module_param(mailled, int, 0444);
module_param(brightness, int, 0444);
module_param(threeg, int, 0444);
module_param(force_series, int, 0444);
MODULE_PARM_DESC(mailled, "Set initial state of Mail LED");
MODULE_PARM_DESC(brightness, "Set initial LCD backlight brightness");
MODULE_PARM_DESC(threeg, "Set initial state of 3G hardware");
MODULE_PARM_DESC(force_series, "Force a different laptop series");

struct acer_data {
	int mailled;
	int threeg;
	int brightness;
};

struct acer_debug {
	struct dentry *root;
	struct dentry *devices;
	u32 wmid_devices;
};

static struct rfkill *wireless_rfkill;
static struct rfkill *bluetooth_rfkill;

/* Each low-level interface must define at least some of the following */
struct wmi_interface {
	/* The WMI device type */
	u32 type;

	/* The capabilities this interface provides */
	u32 capability;

	/* Private data for the current interface */
	struct acer_data data;

	/* debugfs entries associated with this interface */
	struct acer_debug debug;
};

/* The static interface pointer, points to the currently detected interface */
static struct wmi_interface *interface;

/*
 * Embedded Controller quirks
 * Some laptops require us to directly access the EC to either enable or query
 * features that are not available through WMI.
 */

struct quirk_entry {
	u8 wireless;
	u8 mailled;
	s8 brightness;
	u8 bluetooth;
};

static struct quirk_entry *quirks;

static void set_quirks(void)
{
	if (!interface)
		return;

	if (quirks->mailled)
		interface->capability |= ACER_CAP_MAILLED;

	if (quirks->brightness)
		interface->capability |= ACER_CAP_BRIGHTNESS;
}

static int dmi_matched(const struct dmi_system_id *dmi)
{
	quirks = dmi->driver_data;
	return 0;
}

static struct quirk_entry quirk_unknown = {
};

static struct quirk_entry quirk_acer_aspire_1520 = {
	.brightness = -1,
};

static struct quirk_entry quirk_acer_travelmate_2490 = {
	.mailled = 1,
};

/* This AMW0 laptop has no bluetooth */
static struct quirk_entry quirk_medion_md_98300 = {
	.wireless = 1,
};

static struct quirk_entry quirk_fujitsu_amilo_li_1718 = {
	.wireless = 2,
};

static struct dmi_system_id acer_quirks[] = {
	{
		.callback = dmi_matched,
		.ident = "Acer Aspire 1360",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 1360"),
		},
		.driver_data = &quirk_acer_aspire_1520,
	},
	{
		.callback = dmi_matched,
		.ident = "Acer Aspire 1520",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 1520"),
		},
		.driver_data = &quirk_acer_aspire_1520,
	},
	{
		.callback = dmi_matched,
		.ident = "Acer Aspire 3100",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3100"),
		},
		.driver_data = &quirk_acer_travelmate_2490,
	},
	{
		.callback = dmi_matched,
		.ident = "Acer Aspire 3610",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3610"),
		},
		.driver_data = &quirk_acer_travelmate_2490,
	},
	{
		.callback = dmi_matched,
		.ident = "Acer Aspire 5100",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5100"),
		},
		.driver_data = &quirk_acer_travelmate_2490,
	},
	{
		.callback = dmi_matched,
		.ident = "Acer Aspire 5610",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5610"),
		},
		.driver_data = &quirk_acer_travelmate_2490,
	},
	{
		.callback = dmi_matched,
		.ident = "Acer Aspire 5630",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5630"),
		},
		.driver_data = &quirk_acer_travelmate_2490,
	},
	{
		.callback = dmi_matched,
		.ident = "Acer Aspire 5650",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5650"),
		},
		.driver_data = &quirk_acer_travelmate_2490,
	},
	{
		.callback = dmi_matched,
		.ident = "Acer Aspire 5680",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5680"),
		},
		.driver_data = &quirk_acer_travelmate_2490,
	},
	{
		.callback = dmi_matched,
		.ident = "Acer Aspire 9110",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 9110"),
		},
		.driver_data = &quirk_acer_travelmate_2490,
	},
	{
		.callback = dmi_matched,
		.ident = "Acer TravelMate 2490",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 2490"),
		},
		.driver_data = &quirk_acer_travelmate_2490,
	},
	{
		.callback = dmi_matched,
		.ident = "Acer TravelMate 4200",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4200"),
		},
		.driver_data = &quirk_acer_travelmate_2490,
	},
	{
		.callback = dmi_matched,
		.ident = "Fujitsu Siemens Amilo Li 1718",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
			DMI_MATCH(DMI_PRODUCT_NAME, "AMILO Li 1718"),
		},
		.driver_data = &quirk_fujitsu_amilo_li_1718,
	},
	{
		.callback = dmi_matched,
		.ident = "Medion MD 98300",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
			DMI_MATCH(DMI_PRODUCT_NAME, "WAM2030"),
		},
		.driver_data = &quirk_medion_md_98300,
	},
	{}
};

/* Find which quirks are needed for a particular vendor/ model pair */
static void find_quirks(void)
{
	if (!force_series) {
		dmi_check_system(acer_quirks);
	} else if (force_series == 2490) {
		quirks = &quirk_acer_travelmate_2490;
	}

	if (quirks == NULL)
		quirks = &quirk_unknown;

	set_quirks();
}

/*
 * General interface convenience methods
 */

static bool has_cap(u32 cap)
{
	if ((interface->capability & cap) != 0)
		return 1;

	return 0;
}

/*
 * AMW0 (V1) interface
 */
struct wmab_args {
	u32 eax;
	u32 ebx;
	u32 ecx;
	u32 edx;
};

struct wmab_ret {
	u32 eax;
	u32 ebx;
	u32 ecx;
	u32 edx;
	u32 eex;
};

static acpi_status wmab_execute(struct wmab_args *regbuf,
struct acpi_buffer *result)
{
	struct acpi_buffer input;
	acpi_status status;
	input.length = sizeof(struct wmab_args);
	input.pointer = (u8 *)regbuf;

	status = wmi_evaluate_method(AMW0_GUID1, 1, 1, &input, result);

	return status;
}

static acpi_status AMW0_get_u32(u32 *value, u32 cap,
struct wmi_interface *iface)
{
	int err;
	u8 result;

	switch (cap) {
	case ACER_CAP_MAILLED:
		switch (quirks->mailled) {
		default:
			err = ec_read(0xA, &result);
			if (err)
				return AE_ERROR;
			*value = (result >> 7) & 0x1;
			return AE_OK;
		}
		break;
	case ACER_CAP_WIRELESS:
		switch (quirks->wireless) {
		case 1:
			err = ec_read(0x7B, &result);
			if (err)
				return AE_ERROR;
			*value = result & 0x1;
			return AE_OK;
		case 2:
			err = ec_read(0x71, &result);
			if (err)
				return AE_ERROR;
			*value = result & 0x1;
			return AE_OK;
		default:
			err = ec_read(0xA, &result);
			if (err)
				return AE_ERROR;
			*value = (result >> 2) & 0x1;
			return AE_OK;
		}
		break;
	case ACER_CAP_BLUETOOTH:
		switch (quirks->bluetooth) {
		default:
			err = ec_read(0xA, &result);
			if (err)
				return AE_ERROR;
			*value = (result >> 4) & 0x1;
			return AE_OK;
		}
		break;
	case ACER_CAP_BRIGHTNESS:
		switch (quirks->brightness) {
		default:
			err = ec_read(0x83, &result);
			if (err)
				return AE_ERROR;
			*value = result;
			return AE_OK;
		}
		break;
	default:
		return AE_ERROR;
	}
	return AE_OK;
}

static acpi_status AMW0_set_u32(u32 value, u32 cap, struct wmi_interface *iface)
{
	struct wmab_args args;

	args.eax = ACER_AMW0_WRITE;
	args.ebx = value ? (1<<8) : 0;
	args.ecx = args.edx = 0;

	switch (cap) {
	case ACER_CAP_MAILLED:
		if (value > 1)
			return AE_BAD_PARAMETER;
		args.ebx |= ACER_AMW0_MAILLED_MASK;
		break;
	case ACER_CAP_WIRELESS:
		if (value > 1)
			return AE_BAD_PARAMETER;
		args.ebx |= ACER_AMW0_WIRELESS_MASK;
		break;
	case ACER_CAP_BLUETOOTH:
		if (value > 1)
			return AE_BAD_PARAMETER;
		args.ebx |= ACER_AMW0_BLUETOOTH_MASK;
		break;
	case ACER_CAP_BRIGHTNESS:
		if (value > max_brightness)
			return AE_BAD_PARAMETER;
		switch (quirks->brightness) {
		default:
			return ec_write(0x83, value);
			break;
		}
	default:
		return AE_ERROR;
	}

	/* Actually do the set */
	return wmab_execute(&args, NULL);
}

static acpi_status AMW0_find_mailled(void)
{
	struct wmab_args args;
	struct wmab_ret ret;
	acpi_status status = AE_OK;
	struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *obj;

	args.eax = 0x86;
	args.ebx = args.ecx = args.edx = 0;

	status = wmab_execute(&args, &out);
	if (ACPI_FAILURE(status))
		return status;

	obj = (union acpi_object *) out.pointer;
	if (obj && obj->type == ACPI_TYPE_BUFFER &&
	obj->buffer.length == sizeof(struct wmab_ret)) {
		ret = *((struct wmab_ret *) obj->buffer.pointer);
	} else {
		return AE_ERROR;
	}

	if (ret.eex & 0x1)
		interface->capability |= ACER_CAP_MAILLED;

	kfree(out.pointer);

	return AE_OK;
}

static acpi_status AMW0_set_capabilities(void)
{
	struct wmab_args args;
	struct wmab_ret ret;
	acpi_status status = AE_OK;
	struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *obj;

	/*
	 * On laptops with this strange GUID (non Acer), normal probing doesn't
	 * work.
	 */
	if (wmi_has_guid(AMW0_GUID2)) {
		interface->capability |= ACER_CAP_WIRELESS;
		return AE_OK;
	}

	args.eax = ACER_AMW0_WRITE;
	args.ecx = args.edx = 0;

	args.ebx = 0xa2 << 8;
	args.ebx |= ACER_AMW0_WIRELESS_MASK;

	status = wmab_execute(&args, &out);
	if (ACPI_FAILURE(status))
		return status;

	obj = (union acpi_object *) out.pointer;
	if (obj && obj->type == ACPI_TYPE_BUFFER &&
	obj->buffer.length == sizeof(struct wmab_ret)) {
		ret = *((struct wmab_ret *) obj->buffer.pointer);
	} else {
		return AE_ERROR;
	}

	if (ret.eax & 0x1)
		interface->capability |= ACER_CAP_WIRELESS;

	args.ebx = 2 << 8;
	args.ebx |= ACER_AMW0_BLUETOOTH_MASK;

	status = wmab_execute(&args, &out);
	if (ACPI_FAILURE(status))
		return status;

	obj = (union acpi_object *) out.pointer;
	if (obj && obj->type == ACPI_TYPE_BUFFER
	&& obj->buffer.length == sizeof(struct wmab_ret)) {
		ret = *((struct wmab_ret *) obj->buffer.pointer);
	} else {
		return AE_ERROR;
	}

	if (ret.eax & 0x1)
		interface->capability |= ACER_CAP_BLUETOOTH;

	kfree(out.pointer);

	/*
	 * This appears to be safe to enable, since all Wistron based laptops
	 * appear to use the same EC register for brightness, even if they
	 * differ for wireless, etc
	 */
	if (quirks->brightness >= 0)
		interface->capability |= ACER_CAP_BRIGHTNESS;

	return AE_OK;
}

static struct wmi_interface AMW0_interface = {
	.type = ACER_AMW0,
};

static struct wmi_interface AMW0_V2_interface = {
	.type = ACER_AMW0_V2,
};

/*
 * New interface (The WMID interface)
 */
static acpi_status
WMI_execute_u32(u32 method_id, u32 in, u32 *out)
{
	struct acpi_buffer input = { (acpi_size) sizeof(u32), (void *)(&in) };
	struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *obj;
	u32 tmp;
	acpi_status status;

	status = wmi_evaluate_method(WMID_GUID1, 1, method_id, &input, &result);

	if (ACPI_FAILURE(status))
		return status;

	obj = (union acpi_object *) result.pointer;
	if (obj && obj->type == ACPI_TYPE_BUFFER &&
		obj->buffer.length == sizeof(u32)) {
		tmp = *((u32 *) obj->buffer.pointer);
	} else {
		tmp = 0;
	}

	if (out)
		*out = tmp;

	kfree(result.pointer);

	return status;
}

static acpi_status WMID_get_u32(u32 *value, u32 cap,
struct wmi_interface *iface)
{
	acpi_status status;
	u8 tmp;
	u32 result, method_id = 0;

	switch (cap) {
	case ACER_CAP_WIRELESS:
		method_id = ACER_WMID_GET_WIRELESS_METHODID;
		break;
	case ACER_CAP_BLUETOOTH:
		method_id = ACER_WMID_GET_BLUETOOTH_METHODID;
		break;
	case ACER_CAP_BRIGHTNESS:
		method_id = ACER_WMID_GET_BRIGHTNESS_METHODID;
		break;
	case ACER_CAP_THREEG:
		method_id = ACER_WMID_GET_THREEG_METHODID;
		break;
	case ACER_CAP_MAILLED:
		if (quirks->mailled == 1) {
			ec_read(0x9f, &tmp);
			*value = tmp & 0x1;
			return 0;
		}
	default:
		return AE_ERROR;
	}
	status = WMI_execute_u32(method_id, 0, &result);

	if (ACPI_SUCCESS(status))
		*value = (u8)result;

	return status;
}

static acpi_status WMID_set_u32(u32 value, u32 cap, struct wmi_interface *iface)
{
	u32 method_id = 0;
	char param;

	switch (cap) {
	case ACER_CAP_BRIGHTNESS:
		if (value > max_brightness)
			return AE_BAD_PARAMETER;
		method_id = ACER_WMID_SET_BRIGHTNESS_METHODID;
		break;
	case ACER_CAP_WIRELESS:
		if (value > 1)
			return AE_BAD_PARAMETER;
		method_id = ACER_WMID_SET_WIRELESS_METHODID;
		break;
	case ACER_CAP_BLUETOOTH:
		if (value > 1)
			return AE_BAD_PARAMETER;
		method_id = ACER_WMID_SET_BLUETOOTH_METHODID;
		break;
	case ACER_CAP_THREEG:
		if (value > 1)
			return AE_BAD_PARAMETER;
		method_id = ACER_WMID_SET_THREEG_METHODID;
		break;
	case ACER_CAP_MAILLED:
		if (value > 1)
			return AE_BAD_PARAMETER;
		if (quirks->mailled == 1) {
			param = value ? 0x92 : 0x93;
			i8042_command(&param, 0x1059);
			return 0;
		}
		break;
	default:
		return AE_ERROR;
	}
	return WMI_execute_u32(method_id, (u32)value, NULL);
}

static acpi_status WMID_set_capabilities(void)
{
	struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
	union acpi_object *obj;
	acpi_status status;
	u32 devices;

	status = wmi_query_block(WMID_GUID2, 1, &out);
	if (ACPI_FAILURE(status))
		return status;

	obj = (union acpi_object *) out.pointer;
	if (obj && obj->type == ACPI_TYPE_BUFFER &&
		obj->buffer.length == sizeof(u32)) {
		devices = *((u32 *) obj->buffer.pointer);
	} else {
		return AE_ERROR;
	}

	/* Not sure on the meaning of the relevant bits yet to detect these */
	interface->capability |= ACER_CAP_WIRELESS;
	interface->capability |= ACER_CAP_THREEG;

	/* WMID always provides brightness methods */
	interface->capability |= ACER_CAP_BRIGHTNESS;

	if (devices & 0x10)
		interface->capability |= ACER_CAP_BLUETOOTH;

	if (!(devices & 0x20))
		max_brightness = 0x9;

	return status;
}

static struct wmi_interface wmid_interface = {
	.type = ACER_WMID,
};

/*
 * Generic Device (interface-independent)
 */

static acpi_status get_u32(u32 *value, u32 cap)
{
	acpi_status status = AE_ERROR;

	switch (interface->type) {
	case ACER_AMW0:
		status = AMW0_get_u32(value, cap, interface);
		break;
	case ACER_AMW0_V2:
		if (cap == ACER_CAP_MAILLED) {
			status = AMW0_get_u32(value, cap, interface);
			break;
		}
	case ACER_WMID:
		status = WMID_get_u32(value, cap, interface);
		break;
	}

	return status;
}

static acpi_status set_u32(u32 value, u32 cap)
{
	acpi_status status;

	if (interface->capability & cap) {
		switch (interface->type) {
		case ACER_AMW0:
			return AMW0_set_u32(value, cap, interface);
		case ACER_AMW0_V2:
			if (cap == ACER_CAP_MAILLED)
				return AMW0_set_u32(value, cap, interface);

			/*
			 * On some models, some WMID methods don't toggle
			 * properly. For those cases, we want to run the AMW0
			 * method afterwards to be certain we've really toggled
			 * the device state.
			 */
			if (cap == ACER_CAP_WIRELESS ||
				cap == ACER_CAP_BLUETOOTH) {
				status = WMID_set_u32(value, cap, interface);
				if (ACPI_FAILURE(status))
					return status;

				return AMW0_set_u32(value, cap, interface);
			}
		case ACER_WMID:
			return WMID_set_u32(value, cap, interface);
		default:
			return AE_BAD_PARAMETER;
		}
	}
	return AE_BAD_PARAMETER;
}

static void __init acer_commandline_init(void)
{
	/*
	 * These will all fail silently if the value given is invalid, or the
	 * capability isn't available on the given interface
	 */
	set_u32(mailled, ACER_CAP_MAILLED);
	set_u32(threeg, ACER_CAP_THREEG);
	set_u32(brightness, ACER_CAP_BRIGHTNESS);
}

/*
 * LED device (Mail LED only, no other LEDs known yet)
 */
static void mail_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
	set_u32(value, ACER_CAP_MAILLED);
}

static struct led_classdev mail_led = {
	.name = "acer-wmi::mail",
	.brightness_set = mail_led_set,
};

static int __devinit acer_led_init(struct device *dev)
{
	return led_classdev_register(dev, &mail_led);
}

static void acer_led_exit(void)
{
	led_classdev_unregister(&mail_led);
}

/*
 * Backlight device
 */
static struct backlight_device *acer_backlight_device;

static int read_brightness(struct backlight_device *bd)
{
	u32 value;
	get_u32(&value, ACER_CAP_BRIGHTNESS);
	return value;
}

static int update_bl_status(struct backlight_device *bd)
{
	int intensity = bd->props.brightness;

	if (bd->props.power != FB_BLANK_UNBLANK)
		intensity = 0;
	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
		intensity = 0;

	set_u32(intensity, ACER_CAP_BRIGHTNESS);

	return 0;
}

static struct backlight_ops acer_bl_ops = {
	.get_brightness = read_brightness,
	.update_status = update_bl_status,
};

static int __devinit acer_backlight_init(struct device *dev)
{
	struct backlight_device *bd;

	bd = backlight_device_register("acer-wmi", dev, NULL, &acer_bl_ops);
	if (IS_ERR(bd)) {
		printk(ACER_ERR "Could not register Acer backlight device\n");
		acer_backlight_device = NULL;
		return PTR_ERR(bd);
	}

	acer_backlight_device = bd;

	bd->props.power = FB_BLANK_UNBLANK;
	bd->props.brightness = max_brightness;
	bd->props.max_brightness = max_brightness;
	backlight_update_status(bd);
	return 0;
}

static void acer_backlight_exit(void)
{
	backlight_device_unregister(acer_backlight_device);
}

/*
 * Rfkill devices
 */
static void acer_rfkill_update(struct work_struct *ignored);
static DECLARE_DELAYED_WORK(acer_rfkill_work, acer_rfkill_update);
static void acer_rfkill_update(struct work_struct *ignored)
{
	u32 state;
	acpi_status status;

	status = get_u32(&state, ACER_CAP_WIRELESS);
	if (ACPI_SUCCESS(status))
		rfkill_force_state(wireless_rfkill, state ?
			RFKILL_STATE_UNBLOCKED : RFKILL_STATE_SOFT_BLOCKED);

	if (has_cap(ACER_CAP_BLUETOOTH)) {
		status = get_u32(&state, ACER_CAP_BLUETOOTH);
		if (ACPI_SUCCESS(status))
			rfkill_force_state(bluetooth_rfkill, state ?
				RFKILL_STATE_UNBLOCKED :
				RFKILL_STATE_SOFT_BLOCKED);
	}

	schedule_delayed_work(&acer_rfkill_work, round_jiffies_relative(HZ));
}

static int acer_rfkill_set(void *data, enum rfkill_state state)
{
	acpi_status status;
	u32 *cap = data;
	status = set_u32((u32) (state == RFKILL_STATE_UNBLOCKED), *cap);
	if (ACPI_FAILURE(status))
		return -ENODEV;
	return 0;
}

static struct rfkill * acer_rfkill_register(struct device *dev,
enum rfkill_type type, char *name, u32 cap)
{
	int err;
	u32 state;
	u32 *data;
	struct rfkill *rfkill_dev;

	rfkill_dev = rfkill_allocate(dev, type);
	if (!rfkill_dev)
		return ERR_PTR(-ENOMEM);
	rfkill_dev->name = name;
	get_u32(&state, cap);
	rfkill_dev->state = state ? RFKILL_STATE_UNBLOCKED :
		RFKILL_STATE_SOFT_BLOCKED;
	data = kzalloc(sizeof(u32), GFP_KERNEL);
	if (!data) {
		rfkill_free(rfkill_dev);
		return ERR_PTR(-ENOMEM);
	}
	*data = cap;
	rfkill_dev->data = data;
	rfkill_dev->toggle_radio = acer_rfkill_set;
	rfkill_dev->user_claim_unsupported = 1;

	err = rfkill_register(rfkill_dev);
	if (err) {
		kfree(rfkill_dev->data);
		rfkill_free(rfkill_dev);
		return ERR_PTR(err);
	}
	return rfkill_dev;
}

static int acer_rfkill_init(struct device *dev)
{
	wireless_rfkill = acer_rfkill_register(dev, RFKILL_TYPE_WLAN,
		"acer-wireless", ACER_CAP_WIRELESS);
	if (IS_ERR(wireless_rfkill))
		return PTR_ERR(wireless_rfkill);

	if (has_cap(ACER_CAP_BLUETOOTH)) {
		bluetooth_rfkill = acer_rfkill_register(dev,
			RFKILL_TYPE_BLUETOOTH, "acer-bluetooth",
			ACER_CAP_BLUETOOTH);
		if (IS_ERR(bluetooth_rfkill)) {
			kfree(wireless_rfkill->data);
			rfkill_unregister(wireless_rfkill);
			return PTR_ERR(bluetooth_rfkill);
		}
	}

	schedule_delayed_work(&acer_rfkill_work, round_jiffies_relative(HZ));

	return 0;
}

static void acer_rfkill_exit(void)
{
	cancel_delayed_work_sync(&acer_rfkill_work);
	kfree(wireless_rfkill->data);
	rfkill_unregister(wireless_rfkill);
	if (has_cap(ACER_CAP_BLUETOOTH)) {
		kfree(wireless_rfkill->data);
		rfkill_unregister(bluetooth_rfkill);
	}
	return;
}

/*
 * sysfs interface
 */
static ssize_t show_bool_threeg(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	u32 result; \
	acpi_status status = get_u32(&result, ACER_CAP_THREEG);
	if (ACPI_SUCCESS(status))
		return sprintf(buf, "%u\n", result);
	return sprintf(buf, "Read error\n");
}

static ssize_t set_bool_threeg(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	u32 tmp = simple_strtoul(buf, NULL, 10);
	acpi_status status = set_u32(tmp, ACER_CAP_THREEG);
		if (ACPI_FAILURE(status))
			return -EINVAL;
	return count;
}
static DEVICE_ATTR(threeg, S_IWUGO | S_IRUGO | S_IWUSR, show_bool_threeg,
	set_bool_threeg);

static ssize_t show_interface(struct device *dev, struct device_attribute *attr,
	char *buf)
{
	switch (interface->type) {
	case ACER_AMW0:
		return sprintf(buf, "AMW0\n");
	case ACER_AMW0_V2:
		return sprintf(buf, "AMW0 v2\n");
	case ACER_WMID:
		return sprintf(buf, "WMID\n");
	default:
		return sprintf(buf, "Error!\n");
	}
}

static DEVICE_ATTR(interface, S_IWUGO | S_IRUGO | S_IWUSR,
	show_interface, NULL);

/*
 * debugfs functions
 */
static u32 get_wmid_devices(void)
{
	struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
	union acpi_object *obj;
	acpi_status status;

	status = wmi_query_block(WMID_GUID2, 1, &out);
	if (ACPI_FAILURE(status))
		return 0;

	obj = (union acpi_object *) out.pointer;
	if (obj && obj->type == ACPI_TYPE_BUFFER &&
		obj->buffer.length == sizeof(u32)) {
		return *((u32 *) obj->buffer.pointer);
	} else {
		return 0;
	}
}

/*
 * Platform device
 */
static int __devinit acer_platform_probe(struct platform_device *device)
{
	int err;

	if (has_cap(ACER_CAP_MAILLED)) {
		err = acer_led_init(&device->dev);
		if (err)
			goto error_mailled;
	}

	if (has_cap(ACER_CAP_BRIGHTNESS)) {
		err = acer_backlight_init(&device->dev);
		if (err)
			goto error_brightness;
	}

	err = acer_rfkill_init(&device->dev);

	return err;

error_brightness:
	acer_led_exit();
error_mailled:
	return err;
}

static int acer_platform_remove(struct platform_device *device)
{
	if (has_cap(ACER_CAP_MAILLED))
		acer_led_exit();
	if (has_cap(ACER_CAP_BRIGHTNESS))
		acer_backlight_exit();

	acer_rfkill_exit();
	return 0;
}

static int acer_platform_suspend(struct platform_device *dev,
pm_message_t state)
{
	u32 value;
	struct acer_data *data = &interface->data;

	if (!data)
		return -ENOMEM;

	if (has_cap(ACER_CAP_MAILLED)) {
		get_u32(&value, ACER_CAP_MAILLED);
		data->mailled = value;
	}

	if (has_cap(ACER_CAP_BRIGHTNESS)) {
		get_u32(&value, ACER_CAP_BRIGHTNESS);
		data->brightness = value;
	}

	return 0;
}

static int acer_platform_resume(struct platform_device *device)
{
	struct acer_data *data = &interface->data;

	if (!data)
		return -ENOMEM;

	if (has_cap(ACER_CAP_MAILLED))
		set_u32(data->mailled, ACER_CAP_MAILLED);

	if (has_cap(ACER_CAP_BRIGHTNESS))
		set_u32(data->brightness, ACER_CAP_BRIGHTNESS);

	return 0;
}

static struct platform_driver acer_platform_driver = {
	.driver = {
		.name = "acer-wmi",
		.owner = THIS_MODULE,
	},
	.probe = acer_platform_probe,
	.remove = acer_platform_remove,
	.suspend = acer_platform_suspend,
	.resume = acer_platform_resume,
};

static struct platform_device *acer_platform_device;

static int remove_sysfs(struct platform_device *device)
{
	if (has_cap(ACER_CAP_THREEG))
		device_remove_file(&device->dev, &dev_attr_threeg);

	device_remove_file(&device->dev, &dev_attr_interface);

	return 0;
}

static int create_sysfs(void)
{
	int retval = -ENOMEM;

	if (has_cap(ACER_CAP_THREEG)) {
		retval = device_create_file(&acer_platform_device->dev,
			&dev_attr_threeg);
		if (retval)
			goto error_sysfs;
	}

	retval = device_create_file(&acer_platform_device->dev,
		&dev_attr_interface);
	if (retval)
		goto error_sysfs;

	return 0;

error_sysfs:
		remove_sysfs(acer_platform_device);
	return retval;
}

static void remove_debugfs(void)
{
	debugfs_remove(interface->debug.devices);
	debugfs_remove(interface->debug.root);
}

static int create_debugfs(void)
{
	interface->debug.root = debugfs_create_dir("acer-wmi", NULL);
	if (!interface->debug.root) {
		printk(ACER_ERR "Failed to create debugfs directory");
		return -ENOMEM;
	}

	interface->debug.devices = debugfs_create_u32("devices", S_IRUGO,
					interface->debug.root,
					&interface->debug.wmid_devices);
	if (!interface->debug.devices)
		goto error_debugfs;

	return 0;

error_debugfs:
	remove_debugfs();
	return -ENOMEM;
}

static int __init acer_wmi_init(void)
{
	int err;

	printk(ACER_INFO "Acer Laptop ACPI-WMI Extras\n");

	find_quirks();

	/*
	 * Detect which ACPI-WMI interface we're using.
	 */
	if (wmi_has_guid(AMW0_GUID1) && wmi_has_guid(WMID_GUID1))
		interface = &AMW0_V2_interface;

	if (!wmi_has_guid(AMW0_GUID1) && wmi_has_guid(WMID_GUID1))
		interface = &wmid_interface;

	if (wmi_has_guid(WMID_GUID2) && interface) {
		if (ACPI_FAILURE(WMID_set_capabilities())) {
			printk(ACER_ERR "Unable to detect available WMID "
					"devices\n");
			return -ENODEV;
		}
	} else if (!wmi_has_guid(WMID_GUID2) && interface) {
		printk(ACER_ERR "No WMID device detection method found\n");
		return -ENODEV;
	}

	if (wmi_has_guid(AMW0_GUID1) && !wmi_has_guid(WMID_GUID1)) {
		interface = &AMW0_interface;

		if (ACPI_FAILURE(AMW0_set_capabilities())) {
			printk(ACER_ERR "Unable to detect available AMW0 "
					"devices\n");
			return -ENODEV;
		}
	}

	if (wmi_has_guid(AMW0_GUID1))
		AMW0_find_mailled();

	if (!interface) {
		printk(ACER_ERR "No or unsupported WMI interface, unable to "
				"load\n");
		return -ENODEV;
	}

	set_quirks();

	if (!acpi_video_backlight_support() && has_cap(ACER_CAP_BRIGHTNESS)) {
		interface->capability &= ~ACER_CAP_BRIGHTNESS;
		printk(ACER_INFO "Brightness must be controlled by "
		       "generic video driver\n");
	}

	if (platform_driver_register(&acer_platform_driver)) {
		printk(ACER_ERR "Unable to register platform driver.\n");
		goto error_platform_register;
	}
	acer_platform_device = platform_device_alloc("acer-wmi", -1);
	platform_device_add(acer_platform_device);

	err = create_sysfs();
	if (err)
		return err;

	if (wmi_has_guid(WMID_GUID2)) {
		interface->debug.wmid_devices = get_wmid_devices();
		err = create_debugfs();
		if (err)
			return err;
	}

	/* Override any initial settings with values from the commandline */
	acer_commandline_init();

	return 0;

error_platform_register:
	return -ENODEV;
}

static void __exit acer_wmi_exit(void)
{
	remove_sysfs(acer_platform_device);
	remove_debugfs();
	platform_device_del(acer_platform_device);
	platform_driver_unregister(&acer_platform_driver);

	printk(ACER_INFO "Acer Laptop WMI Extras unloaded\n");
	return;
}

module_init(acer_wmi_init);
module_exit(acer_wmi_exit);