summaryrefslogtreecommitdiff
path: root/drivers/hid/hid-uclogic.c
blob: 1509d7287ff3e60e79c845214e47e901fae650f8 (plain) (blame)
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
/*
 *  HID driver for UC-Logic devices not fully compliant with HID standard
 *
 *  Copyright (c) 2010-2014 Nikolai Kondrashov
 *  Copyright (c) 2013 Martin Rusko
 */

/*
 * 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.
 */

#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <asm/unaligned.h>
#include "usbhid/usbhid.h"

#include "hid-ids.h"

/* Size of the original descriptor of WPXXXXU tablets */
#define WPXXXXU_RDESC_ORIG_SIZE	212

/* Fixed WP4030U report descriptor */
static __u8 wp4030u_rdesc_fixed[] = {
	0x05, 0x0D,         /*  Usage Page (Digitizer),             */
	0x09, 0x02,         /*  Usage (Pen),                        */
	0xA1, 0x01,         /*  Collection (Application),           */
	0x85, 0x09,         /*      Report ID (9),                  */
	0x09, 0x20,         /*      Usage (Stylus),                 */
	0xA0,               /*      Collection (Physical),          */
	0x75, 0x01,         /*          Report Size (1),            */
	0x09, 0x42,         /*          Usage (Tip Switch),         */
	0x09, 0x44,         /*          Usage (Barrel Switch),      */
	0x09, 0x46,         /*          Usage (Tablet Pick),        */
	0x14,               /*          Logical Minimum (0),        */
	0x25, 0x01,         /*          Logical Maximum (1),        */
	0x95, 0x03,         /*          Report Count (3),           */
	0x81, 0x02,         /*          Input (Variable),           */
	0x95, 0x05,         /*          Report Count (5),           */
	0x81, 0x01,         /*          Input (Constant),           */
	0x75, 0x10,         /*          Report Size (16),           */
	0x95, 0x01,         /*          Report Count (1),           */
	0x14,               /*          Logical Minimum (0),        */
	0xA4,               /*          Push,                       */
	0x05, 0x01,         /*          Usage Page (Desktop),       */
	0x55, 0xFD,         /*          Unit Exponent (-3),         */
	0x65, 0x13,         /*          Unit (Inch),                */
	0x34,               /*          Physical Minimum (0),       */
	0x09, 0x30,         /*          Usage (X),                  */
	0x46, 0xA0, 0x0F,   /*          Physical Maximum (4000),    */
	0x26, 0xFF, 0x7F,   /*          Logical Maximum (32767),    */
	0x81, 0x02,         /*          Input (Variable),           */
	0x09, 0x31,         /*          Usage (Y),                  */
	0x46, 0xB8, 0x0B,   /*          Physical Maximum (3000),    */
	0x26, 0xFF, 0x7F,   /*          Logical Maximum (32767),    */
	0x81, 0x02,         /*          Input (Variable),           */
	0xB4,               /*          Pop,                        */
	0x09, 0x30,         /*          Usage (Tip Pressure),       */
	0x26, 0xFF, 0x03,   /*          Logical Maximum (1023),     */
	0x81, 0x02,         /*          Input (Variable),           */
	0xC0,               /*      End Collection,                 */
	0xC0                /*  End Collection                      */
};

/* Fixed WP5540U report descriptor */
static __u8 wp5540u_rdesc_fixed[] = {
	0x05, 0x0D,         /*  Usage Page (Digitizer),             */
	0x09, 0x02,         /*  Usage (Pen),                        */
	0xA1, 0x01,         /*  Collection (Application),           */
	0x85, 0x09,         /*      Report ID (9),                  */
	0x09, 0x20,         /*      Usage (Stylus),                 */
	0xA0,               /*      Collection (Physical),          */
	0x75, 0x01,         /*          Report Size (1),            */
	0x09, 0x42,         /*          Usage (Tip Switch),         */
	0x09, 0x44,         /*          Usage (Barrel Switch),      */
	0x09, 0x46,         /*          Usage (Tablet Pick),        */
	0x14,               /*          Logical Minimum (0),        */
	0x25, 0x01,         /*          Logical Maximum (1),        */
	0x95, 0x03,         /*          Report Count (3),           */
	0x81, 0x02,         /*          Input (Variable),           */
	0x95, 0x05,         /*          Report Count (5),           */
	0x81, 0x01,         /*          Input (Constant),           */
	0x75, 0x10,         /*          Report Size (16),           */
	0x95, 0x01,         /*          Report Count (1),           */
	0x14,               /*          Logical Minimum (0),        */
	0xA4,               /*          Push,                       */
	0x05, 0x01,         /*          Usage Page (Desktop),       */
	0x55, 0xFD,         /*          Unit Exponent (-3),         */
	0x65, 0x13,         /*          Unit (Inch),                */
	0x34,               /*          Physical Minimum (0),       */
	0x09, 0x30,         /*          Usage (X),                  */
	0x46, 0x7C, 0x15,   /*          Physical Maximum (5500),    */
	0x26, 0xFF, 0x7F,   /*          Logical Maximum (32767),    */
	0x81, 0x02,         /*          Input (Variable),           */
	0x09, 0x31,         /*          Usage (Y),                  */
	0x46, 0xA0, 0x0F,   /*          Physical Maximum (4000),    */
	0x26, 0xFF, 0x7F,   /*          Logical Maximum (32767),    */
	0x81, 0x02,         /*          Input (Variable),           */
	0xB4,               /*          Pop,                        */
	0x09, 0x30,         /*          Usage (Tip Pressure),       */
	0x26, 0xFF, 0x03,   /*          Logical Maximum (1023),     */
	0x81, 0x02,         /*          Input (Variable),           */
	0xC0,               /*      End Collection,                 */
	0xC0,               /*  End Collection,                     */
	0x05, 0x01,         /*  Usage Page (Desktop),               */
	0x09, 0x02,         /*  Usage (Mouse),                      */
	0xA1, 0x01,         /*  Collection (Application),           */
	0x85, 0x08,         /*      Report ID (8),                  */
	0x09, 0x01,         /*      Usage (Pointer),                */
	0xA0,               /*      Collection (Physical),          */
	0x75, 0x01,         /*          Report Size (1),            */
	0x05, 0x09,         /*          Usage Page (Button),        */
	0x19, 0x01,         /*          Usage Minimum (01h),        */
	0x29, 0x03,         /*          Usage Maximum (03h),        */
	0x14,               /*          Logical Minimum (0),        */
	0x25, 0x01,         /*          Logical Maximum (1),        */
	0x95, 0x03,         /*          Report Count (3),           */
	0x81, 0x02,         /*          Input (Variable),           */
	0x95, 0x05,         /*          Report Count (5),           */
	0x81, 0x01,         /*          Input (Constant),           */
	0x05, 0x01,         /*          Usage Page (Desktop),       */
	0x75, 0x08,         /*          Report Size (8),            */
	0x09, 0x30,         /*          Usage (X),                  */
	0x09, 0x31,         /*          Usage (Y),                  */
	0x15, 0x81,         /*          Logical Minimum (-127),     */
	0x25, 0x7F,         /*          Logical Maximum (127),      */
	0x95, 0x02,         /*          Report Count (2),           */
	0x81, 0x06,         /*          Input (Variable, Relative), */
	0x09, 0x38,         /*          Usage (Wheel),              */
	0x15, 0xFF,         /*          Logical Minimum (-1),       */
	0x25, 0x01,         /*          Logical Maximum (1),        */
	0x95, 0x01,         /*          Report Count (1),           */
	0x81, 0x06,         /*          Input (Variable, Relative), */
	0x81, 0x01,         /*          Input (Constant),           */
	0xC0,               /*      End Collection,                 */
	0xC0                /*  End Collection                      */
};

/* Fixed WP8060U report descriptor */
static __u8 wp8060u_rdesc_fixed[] = {
	0x05, 0x0D,         /*  Usage Page (Digitizer),             */
	0x09, 0x02,         /*  Usage (Pen),                        */
	0xA1, 0x01,         /*  Collection (Application),           */
	0x85, 0x09,         /*      Report ID (9),                  */
	0x09, 0x20,         /*      Usage (Stylus),                 */
	0xA0,               /*      Collection (Physical),          */
	0x75, 0x01,         /*          Report Size (1),            */
	0x09, 0x42,         /*          Usage (Tip Switch),         */
	0x09, 0x44,         /*          Usage (Barrel Switch),      */
	0x09, 0x46,         /*          Usage (Tablet Pick),        */
	0x14,               /*          Logical Minimum (0),        */
	0x25, 0x01,         /*          Logical Maximum (1),        */
	0x95, 0x03,         /*          Report Count (3),           */
	0x81, 0x02,         /*          Input (Variable),           */
	0x95, 0x05,         /*          Report Count (5),           */
	0x81, 0x01,         /*          Input (Constant),           */
	0x75, 0x10,         /*          Report Size (16),           */
	0x95, 0x01,         /*          Report Count (1),           */
	0x14,               /*          Logical Minimum (0),        */
	0xA4,               /*          Push,                       */
	0x05, 0x01,         /*          Usage Page (Desktop),       */
	0x55, 0xFD,         /*          Unit Exponent (-3),         */
	0x65, 0x13,         /*          Unit (Inch),                */
	0x34,               /*          Physical Minimum (0),       */
	0x09, 0x30,         /*          Usage (X),                  */
	0x46, 0x40, 0x1F,   /*          Physical Maximum (8000),    */
	0x26, 0xFF, 0x7F,   /*          Logical Maximum (32767),    */
	0x81, 0x02,         /*          Input (Variable),           */
	0x09, 0x31,         /*          Usage (Y),                  */
	0x46, 0x70, 0x17,   /*          Physical Maximum (6000),    */
	0x26, 0xFF, 0x7F,   /*          Logical Maximum (32767),    */
	0x81, 0x02,         /*          Input (Variable),           */
	0xB4,               /*          Pop,                        */
	0x09, 0x30,         /*          Usage (Tip Pressure),       */
	0x26, 0xFF, 0x03,   /*          Logical Maximum (1023),     */
	0x81, 0x02,         /*          Input (Variable),           */
	0xC0,               /*      End Collection,                 */
	0xC0,               /*  End Collection,                     */
	0x05, 0x01,         /*  Usage Page (Desktop),               */
	0x09, 0x02,         /*  Usage (Mouse),                      */
	0xA1, 0x01,         /*  Collection (Application),           */
	0x85, 0x08,         /*      Report ID (8),                  */
	0x09, 0x01,         /*      Usage (Pointer),                */
	0xA0,               /*      Collection (Physical),          */
	0x75, 0x01,         /*          Report Size (1),            */
	0x05, 0x09,         /*          Usage Page (Button),        */
	0x19, 0x01,         /*          Usage Minimum (01h),        */
	0x29, 0x03,         /*          Usage Maximum (03h),        */
	0x14,               /*          Logical Minimum (0),        */
	0x25, 0x01,         /*          Logical Maximum (1),        */
	0x95, 0x03,         /*          Report Count (3),           */
	0x81, 0x02,         /*          Input (Variable),           */
	0x95, 0x05,         /*          Report Count (5),           */
	0x81, 0x01,         /*          Input (Constant),           */
	0x05, 0x01,         /*          Usage Page (Desktop),       */
	0x75, 0x08,         /*          Report Size (8),            */
	0x09, 0x30,         /*          Usage (X),                  */
	0x09, 0x31,         /*          Usage (Y),                  */
	0x15, 0x81,         /*          Logical Minimum (-127),     */
	0x25, 0x7F,         /*          Logical Maximum (127),      */
	0x95, 0x02,         /*          Report Count (2),           */
	0x81, 0x06,         /*          Input (Variable, Relative), */
	0x09, 0x38,         /*          Usage (Wheel),              */
	0x15, 0xFF,         /*          Logical Minimum (-1),       */
	0x25, 0x01,         /*          Logical Maximum (1),        */
	0x95, 0x01,         /*          Report Count (1),           */
	0x81, 0x06,         /*          Input (Variable, Relative), */
	0x81, 0x01,         /*          Input (Constant),           */
	0xC0,               /*      End Collection,                 */
	0xC0                /*  End Collection                      */
};

/* Size of the original descriptor of WP1062 tablet */
#define WP1062_RDESC_ORIG_SIZE	254

/* Fixed WP1062 report descriptor */
static __u8 wp1062_rdesc_fixed[] = {
	0x05, 0x0D,         /*  Usage Page (Digitizer),             */
	0x09, 0x02,         /*  Usage (Pen),                        */
	0xA1, 0x01,         /*  Collection (Application),           */
	0x85, 0x09,         /*      Report ID (9),                  */
	0x09, 0x20,         /*      Usage (Stylus),                 */
	0xA0,               /*      Collection (Physical),          */
	0x75, 0x01,         /*          Report Size (1),            */
	0x09, 0x42,         /*          Usage (Tip Switch),         */
	0x09, 0x44,         /*          Usage (Barrel Switch),      */
	0x09, 0x46,         /*          Usage (Tablet Pick),        */
	0x14,               /*          Logical Minimum (0),        */
	0x25, 0x01,         /*          Logical Maximum (1),        */
	0x95, 0x03,         /*          Report Count (3),           */
	0x81, 0x02,         /*          Input (Variable),           */
	0x95, 0x04,         /*          Report Count (4),           */
	0x81, 0x01,         /*          Input (Constant),           */
	0x09, 0x32,         /*          Usage (In Range),           */
	0x95, 0x01,         /*          Report Count (1),           */
	0x81, 0x02,         /*          Input (Variable),           */
	0x75, 0x10,         /*          Report Size (16),           */
	0x95, 0x01,         /*          Report Count (1),           */
	0x14,               /*          Logical Minimum (0),        */
	0xA4,               /*          Push,                       */
	0x05, 0x01,         /*          Usage Page (Desktop),       */
	0x55, 0xFD,         /*          Unit Exponent (-3),         */
	0x65, 0x13,         /*          Unit (Inch),                */
	0x34,               /*          Physical Minimum (0),       */
	0x09, 0x30,         /*          Usage (X),                  */
	0x46, 0x10, 0x27,   /*          Physical Maximum (10000),   */
	0x26, 0x20, 0x4E,   /*          Logical Maximum (20000),    */
	0x81, 0x02,         /*          Input (Variable),           */
	0x09, 0x31,         /*          Usage (Y),                  */
	0x46, 0xB7, 0x19,   /*          Physical Maximum (6583),    */
	0x26, 0x6E, 0x33,   /*          Logical Maximum (13166),    */
	0x81, 0x02,         /*          Input (Variable),           */
	0xB4,               /*          Pop,                        */
	0x09, 0x30,         /*          Usage (Tip Pressure),       */
	0x26, 0xFF, 0x03,   /*          Logical Maximum (1023),     */
	0x81, 0x02,         /*          Input (Variable),           */
	0xC0,               /*      End Collection,                 */
	0xC0                /*  End Collection                      */
};

/* Size of the original descriptor of PF1209 tablet */
#define PF1209_RDESC_ORIG_SIZE	234

/* Fixed PF1209 report descriptor */
static __u8 pf1209_rdesc_fixed[] = {
	0x05, 0x0D,         /*  Usage Page (Digitizer),             */
	0x09, 0x02,         /*  Usage (Pen),                        */
	0xA1, 0x01,         /*  Collection (Application),           */
	0x85, 0x09,         /*      Report ID (9),                  */
	0x09, 0x20,         /*      Usage (Stylus),                 */
	0xA0,               /*      Collection (Physical),          */
	0x75, 0x01,         /*          Report Size (1),            */
	0x09, 0x42,         /*          Usage (Tip Switch),         */
	0x09, 0x44,         /*          Usage (Barrel Switch),      */
	0x09, 0x46,         /*          Usage (Tablet Pick),        */
	0x14,               /*          Logical Minimum (0),        */
	0x25, 0x01,         /*          Logical Maximum (1),        */
	0x95, 0x03,         /*          Report Count (3),           */
	0x81, 0x02,         /*          Input (Variable),           */
	0x95, 0x05,         /*          Report Count (5),           */
	0x81, 0x01,         /*          Input (Constant),           */
	0x75, 0x10,         /*          Report Size (16),           */
	0x95, 0x01,         /*          Report Count (1),           */
	0x14,               /*          Logical Minimum (0),        */
	0xA4,               /*          Push,                       */
	0x05, 0x01,         /*          Usage Page (Desktop),       */
	0x55, 0xFD,         /*          Unit Exponent (-3),         */
	0x65, 0x13,         /*          Unit (Inch),                */
	0x34,               /*          Physical Minimum (0),       */
	0x09, 0x30,         /*          Usage (X),                  */
	0x46, 0xE0, 0x2E,   /*          Physical Maximum (12000),   */
	0x26, 0xFF, 0x7F,   /*          Logical Maximum (32767),    */
	0x81, 0x02,         /*          Input (Variable),           */
	0x09, 0x31,         /*          Usage (Y),                  */
	0x46, 0x28, 0x23,   /*          Physical Maximum (9000),    */
	0x26, 0xFF, 0x7F,   /*          Logical Maximum (32767),    */
	0x81, 0x02,         /*          Input (Variable),           */
	0xB4,               /*          Pop,                        */
	0x09, 0x30,         /*          Usage (Tip Pressure),       */
	0x26, 0xFF, 0x03,   /*          Logical Maximum (1023),     */
	0x81, 0x02,         /*          Input (Variable),           */
	0xC0,               /*      End Collection,                 */
	0xC0,               /*  End Collection,                     */
	0x05, 0x01,         /*  Usage Page (Desktop),               */
	0x09, 0x02,         /*  Usage (Mouse),                      */
	0xA1, 0x01,         /*  Collection (Application),           */
	0x85, 0x08,         /*      Report ID (8),                  */
	0x09, 0x01,         /*      Usage (Pointer),                */
	0xA0,               /*      Collection (Physical),          */
	0x75, 0x01,         /*          Report Size (1),            */
	0x05, 0x09,         /*          Usage Page (Button),        */
	0x19, 0x01,         /*          Usage Minimum (01h),        */
	0x29, 0x03,         /*          Usage Maximum (03h),        */
	0x14,               /*          Logical Minimum (0),        */
	0x25, 0x01,         /*          Logical Maximum (1),        */
	0x95, 0x03,         /*          Report Count (3),           */
	0x81, 0x02,         /*          Input (Variable),           */
	0x95, 0x05,         /*          Report Count (5),           */
	0x81, 0x01,         /*          Input (Constant),           */
	0x05, 0x01,         /*          Usage Page (Desktop),       */
	0x75, 0x08,         /*          Report Size (8),            */
	0x09, 0x30,         /*          Usage (X),                  */
	0x09, 0x31,         /*          Usage (Y),                  */
	0x15, 0x81,         /*          Logical Minimum (-127),     */
	0x25, 0x7F,         /*          Logical Maximum (127),      */
	0x95, 0x02,         /*          Report Count (2),           */
	0x81, 0x06,         /*          Input (Variable, Relative), */
	0x09, 0x38,         /*          Usage (Wheel),              */
	0x15, 0xFF,         /*          Logical Minimum (-1),       */
	0x25, 0x01,         /*          Logical Maximum (1),        */
	0x95, 0x01,         /*          Report Count (1),           */
	0x81, 0x06,         /*          Input (Variable, Relative), */
	0x81, 0x01,         /*          Input (Constant),           */
	0xC0,               /*      End Collection,                 */
	0xC0                /*  End Collection                      */
};

/* Size of the original descriptors of TWHL850 tablet */
#define TWHL850_RDESC_ORIG_SIZE0	182
#define TWHL850_RDESC_ORIG_SIZE1	161
#define TWHL850_RDESC_ORIG_SIZE2	92

/* Fixed PID 0522 tablet report descriptor, interface 0 (stylus) */
static __u8 twhl850_rdesc_fixed0[] = {
	0x05, 0x0D,         /*  Usage Page (Digitizer),             */
	0x09, 0x02,         /*  Usage (Pen),                        */
	0xA1, 0x01,         /*  Collection (Application),           */
	0x85, 0x09,         /*      Report ID (9),                  */
	0x09, 0x20,         /*      Usage (Stylus),                 */
	0xA0,               /*      Collection (Physical),          */
	0x14,               /*          Logical Minimum (0),        */
	0x25, 0x01,         /*          Logical Maximum (1),        */
	0x75, 0x01,         /*          Report Size (1),            */
	0x95, 0x03,         /*          Report Count (3),           */
	0x09, 0x42,         /*          Usage (Tip Switch),         */
	0x09, 0x44,         /*          Usage (Barrel Switch),      */
	0x09, 0x46,         /*          Usage (Tablet Pick),        */
	0x81, 0x02,         /*          Input (Variable),           */
	0x81, 0x03,         /*          Input (Constant, Variable), */
	0x95, 0x01,         /*          Report Count (1),           */
	0x09, 0x32,         /*          Usage (In Range),           */
	0x81, 0x02,         /*          Input (Variable),           */
	0x81, 0x03,         /*          Input (Constant, Variable), */
	0x75, 0x10,         /*          Report Size (16),           */
	0xA4,               /*          Push,                       */
	0x05, 0x01,         /*          Usage Page (Desktop),       */
	0x65, 0x13,         /*          Unit (Inch),                */
	0x55, 0xFD,         /*          Unit Exponent (-3),         */
	0x34,               /*          Physical Minimum (0),       */
	0x09, 0x30,         /*          Usage (X),                  */
	0x46, 0x40, 0x1F,   /*          Physical Maximum (8000),    */
	0x26, 0x00, 0x7D,   /*          Logical Maximum (32000),    */
	0x81, 0x02,         /*          Input (Variable),           */
	0x09, 0x31,         /*          Usage (Y),                  */
	0x46, 0x88, 0x13,   /*          Physical Maximum (5000),    */
	0x26, 0x20, 0x4E,   /*          Logical Maximum (20000),    */
	0x81, 0x02,         /*          Input (Variable),           */
	0xB4,               /*          Pop,                        */
	0x09, 0x30,         /*          Usage (Tip Pressure),       */
	0x26, 0xFF, 0x03,   /*          Logical Maximum (1023),     */
	0x81, 0x02,         /*          Input (Variable),           */
	0xC0,               /*      End Collection,                 */
	0xC0                /*  End Collection                      */
};

/* Fixed PID 0522 tablet report descriptor, interface 1 (mouse) */
static __u8 twhl850_rdesc_fixed1[] = {
	0x05, 0x01,         /*  Usage Page (Desktop),               */
	0x09, 0x02,         /*  Usage (Mouse),                      */
	0xA1, 0x01,         /*  Collection (Application),           */
	0x85, 0x01,         /*      Report ID (1),                  */
	0x09, 0x01,         /*      Usage (Pointer),                */
	0xA0,               /*      Collection (Physical),          */
	0x05, 0x09,         /*          Usage Page (Button),        */
	0x75, 0x01,         /*          Report Size (1),            */
	0x95, 0x03,         /*          Report Count (3),           */
	0x19, 0x01,         /*          Usage Minimum (01h),        */
	0x29, 0x03,         /*          Usage Maximum (03h),        */
	0x14,               /*          Logical Minimum (0),        */
	0x25, 0x01,         /*          Logical Maximum (1),        */
	0x81, 0x02,         /*          Input (Variable),           */
	0x95, 0x05,         /*          Report Count (5),           */
	0x81, 0x03,         /*          Input (Constant, Variable), */
	0x05, 0x01,         /*          Usage Page (Desktop),       */
	0x09, 0x30,         /*          Usage (X),                  */
	0x09, 0x31,         /*          Usage (Y),                  */
	0x16, 0x00, 0x80,   /*          Logical Minimum (-32768),   */
	0x26, 0xFF, 0x7F,   /*          Logical Maximum (32767),    */
	0x75, 0x10,         /*          Report Size (16),           */
	0x95, 0x02,         /*          Report Count (2),           */
	0x81, 0x06,         /*          Input (Variable, Relative), */
	0x09, 0x38,         /*          Usage (Wheel),              */
	0x15, 0xFF,         /*          Logical Minimum (-1),       */
	0x25, 0x01,         /*          Logical Maximum (1),        */
	0x95, 0x01,         /*          Report Count (1),           */
	0x75, 0x08,         /*          Report Size (8),            */
	0x81, 0x06,         /*          Input (Variable, Relative), */
	0x81, 0x03,         /*          Input (Constant, Variable), */
	0xC0,               /*      End Collection,                 */
	0xC0                /*  End Collection                      */
};

/* Fixed PID 0522 tablet report descriptor, interface 2 (frame buttons) */
static __u8 twhl850_rdesc_fixed2[] = {
	0x05, 0x01,         /*  Usage Page (Desktop),               */
	0x09, 0x06,         /*  Usage (Keyboard),                   */
	0xA1, 0x01,         /*  Collection (Application),           */
	0x85, 0x03,         /*      Report ID (3),                  */
	0x05, 0x07,         /*      Usage Page (Keyboard),          */
	0x14,               /*      Logical Minimum (0),            */
	0x19, 0xE0,         /*      Usage Minimum (KB Leftcontrol), */
	0x29, 0xE7,         /*      Usage Maximum (KB Right GUI),   */
	0x25, 0x01,         /*      Logical Maximum (1),            */
	0x75, 0x01,         /*      Report Size (1),                */
	0x95, 0x08,         /*      Report Count (8),               */
	0x81, 0x02,         /*      Input (Variable),               */
	0x18,               /*      Usage Minimum (None),           */
	0x29, 0xFF,         /*      Usage Maximum (FFh),            */
	0x26, 0xFF, 0x00,   /*      Logical Maximum (255),          */
	0x75, 0x08,         /*      Report Size (8),                */
	0x95, 0x06,         /*      Report Count (6),               */
	0x80,               /*      Input,                          */
	0xC0                /*  End Collection                      */
};

/* Size of the original descriptors of TWHA60 tablet */
#define TWHA60_RDESC_ORIG_SIZE0 254
#define TWHA60_RDESC_ORIG_SIZE1 139

/* Fixed TWHA60 report descriptor, interface 0 (stylus) */
static __u8 twha60_rdesc_fixed0[] = {
	0x05, 0x0D,         /*  Usage Page (Digitizer),             */
	0x09, 0x02,         /*  Usage (Pen),                        */
	0xA1, 0x01,         /*  Collection (Application),           */
	0x85, 0x09,         /*      Report ID (9),                  */
	0x09, 0x20,         /*      Usage (Stylus),                 */
	0xA0,               /*      Collection (Physical),          */
	0x75, 0x01,         /*          Report Size (1),            */
	0x09, 0x42,         /*          Usage (Tip Switch),         */
	0x09, 0x44,         /*          Usage (Barrel Switch),      */
	0x09, 0x46,         /*          Usage (Tablet Pick),        */
	0x14,               /*          Logical Minimum (0),        */
	0x25, 0x01,         /*          Logical Maximum (1),        */
	0x95, 0x03,         /*          Report Count (3),           */
	0x81, 0x02,         /*          Input (Variable),           */
	0x95, 0x04,         /*          Report Count (4),           */
	0x81, 0x01,         /*          Input (Constant),           */
	0x09, 0x32,         /*          Usage (In Range),           */
	0x95, 0x01,         /*          Report Count (1),           */
	0x81, 0x02,         /*          Input (Variable),           */
	0x75, 0x10,         /*          Report Size (16),           */
	0x95, 0x01,         /*          Report Count (1),           */
	0x14,               /*          Logical Minimum (0),        */
	0xA4,               /*          Push,                       */
	0x05, 0x01,         /*          Usage Page (Desktop),       */
	0x55, 0xFD,         /*          Unit Exponent (-3),         */
	0x65, 0x13,         /*          Unit (Inch),                */
	0x34,               /*          Physical Minimum (0),       */
	0x09, 0x30,         /*          Usage (X),                  */
	0x46, 0x10, 0x27,   /*          Physical Maximum (10000),   */
	0x27, 0x3F, 0x9C,
		0x00, 0x00, /*          Logical Maximum (39999),    */
	0x81, 0x02,         /*          Input (Variable),           */
	0x09, 0x31,         /*          Usage (Y),                  */
	0x46, 0x6A, 0x18,   /*          Physical Maximum (6250),    */
	0x26, 0xA7, 0x61,   /*          Logical Maximum (24999),    */
	0x81, 0x02,         /*          Input (Variable),           */
	0xB4,               /*          Pop,                        */
	0x09, 0x30,         /*          Usage (Tip Pressure),       */
	0x26, 0xFF, 0x03,   /*          Logical Maximum (1023),     */
	0x81, 0x02,         /*          Input (Variable),           */
	0xC0,               /*      End Collection,                 */
	0xC0                /*  End Collection                      */
};

/* Fixed TWHA60 report descriptor, interface 1 (frame buttons) */
static __u8 twha60_rdesc_fixed1[] = {
	0x05, 0x01, /*  Usage Page (Desktop),       */
	0x09, 0x06, /*  Usage (Keyboard),           */
	0xA1, 0x01, /*  Collection (Application),   */
	0x85, 0x05, /*      Report ID (5),          */
	0x05, 0x07, /*      Usage Page (Keyboard),  */
	0x14,       /*      Logical Minimum (0),    */
	0x25, 0x01, /*      Logical Maximum (1),    */
	0x75, 0x01, /*      Report Size (1),        */
	0x95, 0x08, /*      Report Count (8),       */
	0x81, 0x01, /*      Input (Constant),       */
	0x95, 0x0C, /*      Report Count (12),      */
	0x19, 0x3A, /*      Usage Minimum (KB F1),  */
	0x29, 0x45, /*      Usage Maximum (KB F12), */
	0x81, 0x02, /*      Input (Variable),       */
	0x95, 0x0C, /*      Report Count (12),      */
	0x19, 0x68, /*      Usage Minimum (KB F13), */
	0x29, 0x73, /*      Usage Maximum (KB F24), */
	0x81, 0x02, /*      Input (Variable),       */
	0x95, 0x08, /*      Report Count (8),       */
	0x81, 0x01, /*      Input (Constant),       */
	0xC0        /*  End Collection              */
};

/* Report descriptor template placeholder head */
#define UCLOGIC_PH_HEAD	0xFE, 0xED, 0x1D

/* Report descriptor template placeholder IDs */
enum uclogic_ph_id {
	UCLOGIC_PH_ID_X_LM,
	UCLOGIC_PH_ID_X_PM,
	UCLOGIC_PH_ID_Y_LM,
	UCLOGIC_PH_ID_Y_PM,
	UCLOGIC_PH_ID_PRESSURE_LM,
	UCLOGIC_PH_ID_NUM
};

/* Report descriptor template placeholder */
#define UCLOGIC_PH(_ID) UCLOGIC_PH_HEAD, UCLOGIC_PH_ID_##_ID
#define UCLOGIC_PEN_REPORT_ID	0x07

/* Fixed report descriptor template */
static const __u8 uclogic_tablet_rdesc_template[] = {
	0x05, 0x0D,             /*  Usage Page (Digitizer),                 */
	0x09, 0x02,             /*  Usage (Pen),                            */
	0xA1, 0x01,             /*  Collection (Application),               */
	0x85, 0x07,             /*      Report ID (7),                      */
	0x09, 0x20,             /*      Usage (Stylus),                     */
	0xA0,                   /*      Collection (Physical),              */
	0x14,                   /*          Logical Minimum (0),            */
	0x25, 0x01,             /*          Logical Maximum (1),            */
	0x75, 0x01,             /*          Report Size (1),                */
	0x09, 0x42,             /*          Usage (Tip Switch),             */
	0x09, 0x44,             /*          Usage (Barrel Switch),          */
	0x09, 0x46,             /*          Usage (Tablet Pick),            */
	0x95, 0x03,             /*          Report Count (3),               */
	0x81, 0x02,             /*          Input (Variable),               */
	0x95, 0x03,             /*          Report Count (3),               */
	0x81, 0x03,             /*          Input (Constant, Variable),     */
	0x09, 0x32,             /*          Usage (In Range),               */
	0x95, 0x01,             /*          Report Count (1),               */
	0x81, 0x02,             /*          Input (Variable),               */
	0x95, 0x01,             /*          Report Count (1),               */
	0x81, 0x03,             /*          Input (Constant, Variable),     */
	0x75, 0x10,             /*          Report Size (16),               */
	0x95, 0x01,             /*          Report Count (1),               */
	0xA4,                   /*          Push,                           */
	0x05, 0x01,             /*          Usage Page (Desktop),           */
	0x65, 0x13,             /*          Unit (Inch),                    */
	0x55, 0xFD,             /*          Unit Exponent (-3),             */
	0x34,                   /*          Physical Minimum (0),           */
	0x09, 0x30,             /*          Usage (X),                      */
	0x27, UCLOGIC_PH(X_LM), /*          Logical Maximum (PLACEHOLDER),  */
	0x47, UCLOGIC_PH(X_PM), /*          Physical Maximum (PLACEHOLDER), */
	0x81, 0x02,             /*          Input (Variable),               */
	0x09, 0x31,             /*          Usage (Y),                      */
	0x27, UCLOGIC_PH(Y_LM), /*          Logical Maximum (PLACEHOLDER),  */
	0x47, UCLOGIC_PH(Y_PM), /*          Physical Maximum (PLACEHOLDER), */
	0x81, 0x02,             /*          Input (Variable),               */
	0xB4,                   /*          Pop,                            */
	0x09, 0x30,             /*          Usage (Tip Pressure),           */
	0x27,
	UCLOGIC_PH(PRESSURE_LM),/*          Logical Maximum (PLACEHOLDER),  */
	0x81, 0x02,             /*          Input (Variable),               */
	0xC0,                   /*      End Collection,                     */
	0xC0                    /*  End Collection                          */
};

/* Fixed virtual pad report descriptor */
static const __u8 uclogic_buttonpad_rdesc[] = {
	0x05, 0x01,             /*  Usage Page (Desktop),                   */
	0x09, 0x07,             /*  Usage (Keypad),                         */
	0xA1, 0x01,             /*  Collection (Application),               */
	0x85, 0xF7,             /*      Report ID (247),                    */
	0x05, 0x0D,             /*      Usage Page (Digitizers),            */
	0x09, 0x39,             /*      Usage (Tablet Function Keys),       */
	0xA0,                   /*      Collection (Physical),              */
	0x05, 0x09,             /*          Usage Page (Button),            */
	0x75, 0x01,             /*          Report Size (1),                */
	0x95, 0x18,             /*          Report Count (24),              */
	0x81, 0x03,             /*          Input (Constant, Variable),     */
	0x19, 0x01,             /*          Usage Minimum (01h),            */
	0x29, 0x08,             /*          Usage Maximum (08h),            */
	0x95, 0x08,             /*          Report Count (8),               */
	0x81, 0x02,             /*          Input (Variable),               */
	0xC0,                   /*      End Collection                      */
	0xC0                    /*  End Collection                          */
};

/* Parameter indices */
enum uclogic_prm {
	UCLOGIC_PRM_X_LM	= 1,
	UCLOGIC_PRM_Y_LM	= 2,
	UCLOGIC_PRM_PRESSURE_LM	= 4,
	UCLOGIC_PRM_RESOLUTION	= 5,
	UCLOGIC_PRM_NUM
};

/* Driver data */
struct uclogic_drvdata {
	__u8 *rdesc;
	unsigned int rsize;
	bool invert_pen_inrange;
	bool ignore_pen_usage;
	bool has_virtual_pad_interface;
};

static __u8 *uclogic_report_fixup(struct hid_device *hdev, __u8 *rdesc,
					unsigned int *rsize)
{
	struct usb_interface *iface = to_usb_interface(hdev->dev.parent);
	__u8 iface_num = iface->cur_altsetting->desc.bInterfaceNumber;
	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);

	if (drvdata->rdesc != NULL) {
		rdesc = drvdata->rdesc;
		*rsize = drvdata->rsize;
		return rdesc;
	}

	switch (hdev->product) {
	case USB_DEVICE_ID_UCLOGIC_TABLET_PF1209:
		if (*rsize == PF1209_RDESC_ORIG_SIZE) {
			rdesc = pf1209_rdesc_fixed;
			*rsize = sizeof(pf1209_rdesc_fixed);
		}
		break;
	case USB_DEVICE_ID_UCLOGIC_TABLET_WP4030U:
		if (*rsize == WPXXXXU_RDESC_ORIG_SIZE) {
			rdesc = wp4030u_rdesc_fixed;
			*rsize = sizeof(wp4030u_rdesc_fixed);
		}
		break;
	case USB_DEVICE_ID_UCLOGIC_TABLET_WP5540U:
		if (*rsize == WPXXXXU_RDESC_ORIG_SIZE) {
			rdesc = wp5540u_rdesc_fixed;
			*rsize = sizeof(wp5540u_rdesc_fixed);
		}
		break;
	case USB_DEVICE_ID_UCLOGIC_TABLET_WP8060U:
		if (*rsize == WPXXXXU_RDESC_ORIG_SIZE) {
			rdesc = wp8060u_rdesc_fixed;
			*rsize = sizeof(wp8060u_rdesc_fixed);
		}
		break;
	case USB_DEVICE_ID_UCLOGIC_TABLET_WP1062:
		if (*rsize == WP1062_RDESC_ORIG_SIZE) {
			rdesc = wp1062_rdesc_fixed;
			*rsize = sizeof(wp1062_rdesc_fixed);
		}
		break;
	case USB_DEVICE_ID_UCLOGIC_WIRELESS_TABLET_TWHL850:
		switch (iface_num) {
		case 0:
			if (*rsize == TWHL850_RDESC_ORIG_SIZE0) {
				rdesc = twhl850_rdesc_fixed0;
				*rsize = sizeof(twhl850_rdesc_fixed0);
			}
			break;
		case 1:
			if (*rsize == TWHL850_RDESC_ORIG_SIZE1) {
				rdesc = twhl850_rdesc_fixed1;
				*rsize = sizeof(twhl850_rdesc_fixed1);
			}
			break;
		case 2:
			if (*rsize == TWHL850_RDESC_ORIG_SIZE2) {
				rdesc = twhl850_rdesc_fixed2;
				*rsize = sizeof(twhl850_rdesc_fixed2);
			}
			break;
		}
		break;
	case USB_DEVICE_ID_UCLOGIC_TABLET_TWHA60:
		switch (iface_num) {
		case 0:
			if (*rsize == TWHA60_RDESC_ORIG_SIZE0) {
				rdesc = twha60_rdesc_fixed0;
				*rsize = sizeof(twha60_rdesc_fixed0);
			}
			break;
		case 1:
			if (*rsize == TWHA60_RDESC_ORIG_SIZE1) {
				rdesc = twha60_rdesc_fixed1;
				*rsize = sizeof(twha60_rdesc_fixed1);
			}
			break;
		}
		break;
	}

	return rdesc;
}

static int uclogic_input_mapping(struct hid_device *hdev, struct hid_input *hi,
		struct hid_field *field, struct hid_usage *usage,
		unsigned long **bit, int *max)
{
	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);

	/* discard the unused pen interface */
	if ((drvdata->ignore_pen_usage) &&
	    (field->application == HID_DG_PEN))
		return -1;

	/* let hid-core decide what to do */
	return 0;
}

static int uclogic_input_configured(struct hid_device *hdev,
		struct hid_input *hi)
{
	char *name;
	const char *suffix = NULL;
	struct hid_field *field;
	size_t len;

	/* no report associated (HID_QUIRK_MULTI_INPUT not set) */
	if (!hi->report)
		return 0;

	field = hi->report->field[0];

	switch (field->application) {
	case HID_GD_KEYBOARD:
		suffix = "Keyboard";
		break;
	case HID_GD_MOUSE:
		suffix = "Mouse";
		break;
	case HID_GD_KEYPAD:
		suffix = "Pad";
		break;
	case HID_DG_PEN:
		suffix = "Pen";
		break;
	case HID_CP_CONSUMER_CONTROL:
		suffix = "Consumer Control";
		break;
	case HID_GD_SYSTEM_CONTROL:
		suffix = "System Control";
		break;
	}

	if (suffix) {
		len = strlen(hdev->name) + 2 + strlen(suffix);
		name = devm_kzalloc(&hi->input->dev, len, GFP_KERNEL);
		if (name) {
			snprintf(name, len, "%s %s", hdev->name, suffix);
			hi->input->name = name;
		}
	}

	return 0;
}

/**
 * Enable fully-functional tablet mode and determine device parameters.
 *
 * @hdev:	HID device
 */
static int uclogic_tablet_enable(struct hid_device *hdev)
{
	int rc;
	struct usb_device *usb_dev = hid_to_usb_dev(hdev);
	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
	__le16 *buf = NULL;
	size_t len;
	s32 params[UCLOGIC_PH_ID_NUM];
	s32 resolution;
	__u8 *p;
	s32 v;

	/*
	 * Read string descriptor containing tablet parameters. The specific
	 * string descriptor and data were discovered by sniffing the Windows
	 * driver traffic.
	 * NOTE: This enables fully-functional tablet mode.
	 */
	len = UCLOGIC_PRM_NUM * sizeof(*buf);
	buf = kmalloc(len, GFP_KERNEL);
	if (buf == NULL) {
		rc = -ENOMEM;
		goto cleanup;
	}
	rc = usb_control_msg(usb_dev, usb_rcvctrlpipe(usb_dev, 0),
				USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
				(USB_DT_STRING << 8) + 0x64,
				0x0409, buf, len,
				USB_CTRL_GET_TIMEOUT);
	if (rc == -EPIPE) {
		hid_err(hdev, "device parameters not found\n");
		rc = -ENODEV;
		goto cleanup;
	} else if (rc < 0) {
		hid_err(hdev, "failed to get device parameters: %d\n", rc);
		rc = -ENODEV;
		goto cleanup;
	} else if (rc != len) {
		hid_err(hdev, "invalid device parameters\n");
		rc = -ENODEV;
		goto cleanup;
	}

	/* Extract device parameters */
	params[UCLOGIC_PH_ID_X_LM] = le16_to_cpu(buf[UCLOGIC_PRM_X_LM]);
	params[UCLOGIC_PH_ID_Y_LM] = le16_to_cpu(buf[UCLOGIC_PRM_Y_LM]);
	params[UCLOGIC_PH_ID_PRESSURE_LM] =
		le16_to_cpu(buf[UCLOGIC_PRM_PRESSURE_LM]);
	resolution = le16_to_cpu(buf[UCLOGIC_PRM_RESOLUTION]);
	if (resolution == 0) {
		params[UCLOGIC_PH_ID_X_PM] = 0;
		params[UCLOGIC_PH_ID_Y_PM] = 0;
	} else {
		params[UCLOGIC_PH_ID_X_PM] = params[UCLOGIC_PH_ID_X_LM] *
						1000 / resolution;
		params[UCLOGIC_PH_ID_Y_PM] = params[UCLOGIC_PH_ID_Y_LM] *
						1000 / resolution;
	}

	/* Allocate fixed report descriptor */
	drvdata->rdesc = devm_kzalloc(&hdev->dev,
				sizeof(uclogic_tablet_rdesc_template),
				GFP_KERNEL);
	if (drvdata->rdesc == NULL) {
		rc = -ENOMEM;
		goto cleanup;
	}
	drvdata->rsize = sizeof(uclogic_tablet_rdesc_template);

	/* Format fixed report descriptor */
	memcpy(drvdata->rdesc, uclogic_tablet_rdesc_template,
		drvdata->rsize);
	for (p = drvdata->rdesc;
	     p <= drvdata->rdesc + drvdata->rsize - 4;) {
		if (p[0] == 0xFE && p[1] == 0xED && p[2] == 0x1D &&
		    p[3] < ARRAY_SIZE(params)) {
			v = params[p[3]];
			put_unaligned(cpu_to_le32(v), (s32 *)p);
			p += 4;
		} else {
			p++;
		}
	}

	rc = 0;

cleanup:
	kfree(buf);
	return rc;
}

/**
 * Enable actual button mode.
 *
 * @hdev:	HID device
 */
static int uclogic_button_enable(struct hid_device *hdev)
{
	int rc;
	struct usb_device *usb_dev = hid_to_usb_dev(hdev);
	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
	char *str_buf;
	size_t str_len = 16;
	unsigned char *rdesc;
	size_t rdesc_len;

	str_buf = kzalloc(str_len, GFP_KERNEL);
	if (str_buf == NULL) {
		rc = -ENOMEM;
		goto cleanup;
	}

	/* Enable abstract keyboard mode */
	rc = usb_string(usb_dev, 0x7b, str_buf, str_len);
	if (rc == -EPIPE) {
		hid_info(hdev, "button mode setting not found\n");
		rc = 0;
		goto cleanup;
	} else if (rc < 0) {
		hid_err(hdev, "failed to enable abstract keyboard\n");
		goto cleanup;
	} else if (strncmp(str_buf, "HK On", rc)) {
		hid_info(hdev, "invalid answer when requesting buttons: '%s'\n",
			str_buf);
		rc = -EINVAL;
		goto cleanup;
	}

	/* Re-allocate fixed report descriptor */
	rdesc_len = drvdata->rsize + sizeof(uclogic_buttonpad_rdesc);
	rdesc = devm_kzalloc(&hdev->dev, rdesc_len, GFP_KERNEL);
	if (!rdesc) {
		rc = -ENOMEM;
		goto cleanup;
	}

	memcpy(rdesc, drvdata->rdesc, drvdata->rsize);

	/* Append the buttonpad descriptor */
	memcpy(rdesc + drvdata->rsize, uclogic_buttonpad_rdesc,
	       sizeof(uclogic_buttonpad_rdesc));

	/* clean up old rdesc and use the new one */
	drvdata->rsize = rdesc_len;
	devm_kfree(&hdev->dev, drvdata->rdesc);
	drvdata->rdesc = rdesc;

	rc = 0;

cleanup:
	kfree(str_buf);
	return rc;
}

static int uclogic_probe(struct hid_device *hdev,
		const struct hid_device_id *id)
{
	int rc;
	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
	struct usb_device *udev = hid_to_usb_dev(hdev);
	struct uclogic_drvdata *drvdata;

	/*
	 * libinput requires the pad interface to be on a different node
	 * than the pen, so use QUIRK_MULTI_INPUT for all tablets.
	 */
	hdev->quirks |= HID_QUIRK_MULTI_INPUT;
	hdev->quirks |= HID_QUIRK_NO_EMPTY_INPUT;

	/* Allocate and assign driver data */
	drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
	if (drvdata == NULL)
		return -ENOMEM;

	hid_set_drvdata(hdev, drvdata);

	switch (id->product) {
	case USB_DEVICE_ID_HUION_TABLET:
	case USB_DEVICE_ID_YIYNOVA_TABLET:
	case USB_DEVICE_ID_UGEE_TABLET_81:
	case USB_DEVICE_ID_UCLOGIC_DRAWIMAGE_G3:
	case USB_DEVICE_ID_UGEE_TABLET_45:
		/* If this is the pen interface */
		if (intf->cur_altsetting->desc.bInterfaceNumber == 0) {
			rc = uclogic_tablet_enable(hdev);
			if (rc) {
				hid_err(hdev, "tablet enabling failed\n");
				return rc;
			}
			drvdata->invert_pen_inrange = true;

			rc = uclogic_button_enable(hdev);
			drvdata->has_virtual_pad_interface = !rc;
		} else {
			drvdata->ignore_pen_usage = true;
		}
		break;
	case USB_DEVICE_ID_UGTIZER_TABLET_GP0610:
		/* If this is the pen interface */
		if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
			rc = uclogic_tablet_enable(hdev);
			if (rc) {
				hid_err(hdev, "tablet enabling failed\n");
				return rc;
			}
			drvdata->invert_pen_inrange = true;
		} else {
			drvdata->ignore_pen_usage = true;
		}
		break;
	case USB_DEVICE_ID_UCLOGIC_TABLET_TWHA60:
		/*
		 * If it is the three-interface version, which is known to
		 * respond to initialization.
		 */
		if (udev->config->desc.bNumInterfaces == 3) {
			/* If it is the pen interface */
			if (intf->cur_altsetting->desc.bInterfaceNumber == 0) {
				rc = uclogic_tablet_enable(hdev);
				if (rc) {
					hid_err(hdev, "tablet enabling failed\n");
					return rc;
				}
				drvdata->invert_pen_inrange = true;

				rc = uclogic_button_enable(hdev);
				drvdata->has_virtual_pad_interface = !rc;
			} else {
				drvdata->ignore_pen_usage = true;
			}
		}
		break;
	}

	rc = hid_parse(hdev);
	if (rc) {
		hid_err(hdev, "parse failed\n");
		return rc;
	}

	rc = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
	if (rc) {
		hid_err(hdev, "hw start failed\n");
		return rc;
	}

	return 0;
}

static int uclogic_raw_event(struct hid_device *hdev, struct hid_report *report,
			u8 *data, int size)
{
	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);

	if ((report->type == HID_INPUT_REPORT) &&
	    (report->id == UCLOGIC_PEN_REPORT_ID) &&
	    (size >= 2)) {
		if (drvdata->has_virtual_pad_interface && (data[1] & 0x20))
			/* Change to virtual frame button report ID */
			data[0] = 0xf7;
		else if (drvdata->invert_pen_inrange)
			/* Invert the in-range bit */
			data[1] ^= 0x40;
	}

	return 0;
}

static const struct hid_device_id uclogic_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
				USB_DEVICE_ID_UCLOGIC_TABLET_PF1209) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
				USB_DEVICE_ID_UCLOGIC_TABLET_WP4030U) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
				USB_DEVICE_ID_UCLOGIC_TABLET_WP5540U) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
				USB_DEVICE_ID_UCLOGIC_TABLET_WP8060U) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
				USB_DEVICE_ID_UCLOGIC_TABLET_WP1062) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
				USB_DEVICE_ID_UCLOGIC_WIRELESS_TABLET_TWHL850) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
				USB_DEVICE_ID_UCLOGIC_TABLET_TWHA60) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_HUION, USB_DEVICE_ID_HUION_TABLET) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_HUION_TABLET) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_YIYNOVA_TABLET) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_UGEE_TABLET_81) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_UGEE_TABLET_45) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_UCLOGIC_DRAWIMAGE_G3) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UGTIZER, USB_DEVICE_ID_UGTIZER_TABLET_GP0610) },
	{ }
};
MODULE_DEVICE_TABLE(hid, uclogic_devices);

static struct hid_driver uclogic_driver = {
	.name = "uclogic",
	.id_table = uclogic_devices,
	.probe = uclogic_probe,
	.report_fixup = uclogic_report_fixup,
	.raw_event = uclogic_raw_event,
	.input_mapping = uclogic_input_mapping,
	.input_configured = uclogic_input_configured,
};
module_hid_driver(uclogic_driver);

MODULE_AUTHOR("Martin Rusko");
MODULE_AUTHOR("Nikolai Kondrashov");
MODULE_LICENSE("GPL");