aboutsummaryrefslogtreecommitdiff
path: root/drivers/input/tablet/aiptek.c
blob: 292eb507e5d37b721ed1c123d8c6f1d3fbfac627 (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
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
/*
 *  Native support for the Aiptek HyperPen USB Tablets
 *  (4000U/5000U/6000U/8000U/12000U)
 *
 *  Copyright (c) 2001      Chris Atenasio   <chris@crud.net>
 *  Copyright (c) 2002-2004 Bryan W. Headley <bwheadley@earthlink.net>
 *
 *  based on wacom.c by
 *     Vojtech Pavlik      <vojtech@suse.cz>
 *     Andreas Bach Aaen   <abach@stofanet.dk>
 *     Clifford Wolf       <clifford@clifford.at>
 *     Sam Mosel           <sam.mosel@computer.org>
 *     James E. Blair      <corvus@gnu.org>
 *     Daniel Egger        <egger@suse.de>
 *
 *  Many thanks to Oliver Kuechemann for his support.
 *
 *  ChangeLog:
 *      v0.1 - Initial release
 *      v0.2 - Hack to get around fake event 28's. (Bryan W. Headley)
 *      v0.3 - Make URB dynamic (Bryan W. Headley, Jun-8-2002)
 *             Released to Linux 2.4.19 and 2.5.x
 *      v0.4 - Rewrote substantial portions of the code to deal with
 *             corrected control sequences, timing, dynamic configuration,
 *             support of 6000U - 12000U, procfs, and macro key support
 *             (Jan-1-2003 - Feb-5-2003, Bryan W. Headley)
 *      v1.0 - Added support for diagnostic messages, count of messages
 *             received from URB - Mar-8-2003, Bryan W. Headley
 *      v1.1 - added support for tablet resolution, changed DV and proximity
 *             some corrections - Jun-22-2003, martin schneebacher
 *           - Added support for the sysfs interface, deprecating the
 *             procfs interface for 2.5.x kernel. Also added support for
 *             Wheel command. Bryan W. Headley July-15-2003.
 *      v1.2 - Reworked jitter timer as a kernel thread.
 *             Bryan W. Headley November-28-2003/Jan-10-2004.
 *      v1.3 - Repaired issue of kernel thread going nuts on single-processor
 *             machines, introduced programmableDelay as a command line
 *             parameter. Feb 7 2004, Bryan W. Headley.
 *      v1.4 - Re-wire jitter so it does not require a thread. Courtesy of
 *             Rene van Paassen. Added reporting of physical pointer device
 *             (e.g., stylus, mouse in reports 2, 3, 4, 5. We don't know
 *             for reports 1, 6.)
 *             what physical device reports for reports 1, 6.) Also enabled
 *             MOUSE and LENS tool button modes. Renamed "rubber" to "eraser".
 *             Feb 20, 2004, Bryan W. Headley.
 *      v1.5 - Added previousJitterable, so we don't do jitter delay when the
 *             user is holding a button down for periods of time.
 *
 * NOTE:
 *      This kernel driver is augmented by the "Aiptek" XFree86 input
 *      driver for your X server, as well as the Gaiptek GUI Front-end
 *      "Tablet Manager".
 *      These three products are highly interactive with one another,
 *      so therefore it's easier to document them all as one subsystem.
 *      Please visit the project's "home page", located at,
 *      http://aiptektablet.sourceforge.net.
 *
 * 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/jiffies.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb/input.h>
#include <asm/uaccess.h>
#include <asm/unaligned.h>

/*
 * Version Information
 */
#define DRIVER_VERSION "v1.5 (May-15-2004)"
#define DRIVER_AUTHOR  "Bryan W. Headley/Chris Atenasio"
#define DRIVER_DESC    "Aiptek HyperPen USB Tablet Driver (Linux 2.6.x)"

/*
 * Aiptek status packet:
 *
 * (returned as Report 1 - relative coordinates from mouse and stylus)
 *
 *        bit7  bit6  bit5  bit4  bit3  bit2  bit1  bit0
 * byte0   0     0     0     0     0     0     0     1
 * byte1   0     0     0     0     0    BS2   BS    Tip
 * byte2  X7    X6    X5    X4    X3    X2    X1    X0
 * byte3  Y7    Y6    Y5    Y4    Y3    Y2    Y1    Y0
 *
 * (returned as Report 2 - absolute coordinates from the stylus)
 *
 *        bit7  bit6  bit5  bit4  bit3  bit2  bit1  bit0
 * byte0   0     0     0     0     0     0     1     0
 * byte1  X7    X6    X5    X4    X3    X2    X1    X0
 * byte2  X15   X14   X13   X12   X11   X10   X9    X8
 * byte3  Y7    Y6    Y5    Y4    Y3    Y2    Y1    Y0
 * byte4  Y15   Y14   Y13   Y12   Y11   Y10   Y9    Y8
 * byte5   *     *     *    BS2   BS1   Tip   IR    DV
 * byte6  P7    P6    P5    P4    P3    P2    P1    P0
 * byte7  P15   P14   P13   P12   P11   P10   P9    P8
 *
 * (returned as Report 3 - absolute coordinates from the mouse)
 *
 *        bit7  bit6  bit5  bit4  bit3  bit2  bit1  bit0
 * byte0   0     0     0     0     0     0     1     1
 * byte1  X7    X6    X5    X4    X3    X2    X1    X0
 * byte2  X15   X14   X13   X12   X11   X10   X9    X8
 * byte3  Y7    Y6    Y5    Y4    Y3    Y2    Y1    Y0
 * byte4  Y15   Y14   Y13   Y12   Y11   Y10   Y9    Y8
 * byte5   *     *     *    BS2   BS1   Tip   IR    DV
 * byte6  P7    P6    P5    P4    P3    P2    P1    P0
 * byte7  P15   P14   P13   P12   P11   P10   P9    P8
 *
 * (returned as Report 4 - macrokeys from the stylus)
 *
 *        bit7  bit6  bit5  bit4  bit3  bit2  bit1  bit0
 * byte0   0     0     0     0     0     1     0     0
 * byte1   0     0     0    BS2   BS    Tip   IR    DV
 * byte2   0     0     0     0     0     0     1     0
 * byte3   0     0     0    K4    K3    K2    K1    K0
 * byte4  P7    P6    P5    P4    P3    P2    P1    P0
 * byte5  P15   P14   P13   P12   P11   P10   P9    P8
 *
 * (returned as Report 5 - macrokeys from the mouse)
 *
 *        bit7  bit6  bit5  bit4  bit3  bit2  bit1  bit0
 * byte0   0     0     0     0     0     1     0     1
 * byte1   0     0     0    BS2   BS    Tip   IR    DV
 * byte2   0     0     0     0     0     0     1     0
 * byte3   0     0     0    K4    K3    K2    K1    K0
 * byte4  P7    P6    P5    P4    P3    P2    P1    P0
 * byte5  P15   P14   P13   P12   P11   P10   P9    P8
 *
 * IR: In Range = Proximity on
 * DV = Data Valid
 * BS = Barrel Switch (as in, macro keys)
 * BS2 also referred to as Tablet Pick
 *
 * Command Summary:
 *
 * Use report_type CONTROL (3)
 * Use report_id   2
 *
 * Command/Data    Description     Return Bytes    Return Value
 * 0x10/0x00       SwitchToMouse       0
 * 0x10/0x01       SwitchToTablet      0
 * 0x18/0x04       SetResolution       0
 * 0x12/0xFF       AutoGainOn          0
 * 0x17/0x00       FilterOn            0
 * 0x01/0x00       GetXExtension       2           MaxX
 * 0x01/0x01       GetYExtension       2           MaxY
 * 0x02/0x00       GetModelCode        2           ModelCode = LOBYTE
 * 0x03/0x00       GetODMCode          2           ODMCode
 * 0x08/0x00       GetPressureLevels   2           =512
 * 0x04/0x00       GetFirmwareVersion  2           Firmware Version
 * 0x11/0x02       EnableMacroKeys     0
 *
 * To initialize the tablet:
 *
 * (1) Send Resolution500LPI (Command)
 * (2) Query for Model code (Option Report)
 * (3) Query for ODM code (Option Report)
 * (4) Query for firmware (Option Report)
 * (5) Query for GetXExtension (Option Report)
 * (6) Query for GetYExtension (Option Report)
 * (7) Query for GetPressureLevels (Option Report)
 * (8) SwitchToTablet for Absolute coordinates, or
 *     SwitchToMouse for Relative coordinates (Command)
 * (9) EnableMacroKeys (Command)
 * (10) FilterOn (Command)
 * (11) AutoGainOn (Command)
 *
 * (Step 9 can be omitted, but you'll then have no function keys.)
 */

#define USB_VENDOR_ID_AIPTEK				0x08ca
#define USB_REQ_GET_REPORT				0x01
#define USB_REQ_SET_REPORT				0x09

	/* PointerMode codes
	 */
#define AIPTEK_POINTER_ONLY_MOUSE_MODE			0
#define AIPTEK_POINTER_ONLY_STYLUS_MODE			1
#define AIPTEK_POINTER_EITHER_MODE			2

#define AIPTEK_POINTER_ALLOW_MOUSE_MODE(a)		\
	(a == AIPTEK_POINTER_ONLY_MOUSE_MODE ||		\
	 a == AIPTEK_POINTER_EITHER_MODE)
#define AIPTEK_POINTER_ALLOW_STYLUS_MODE(a)		\
	(a == AIPTEK_POINTER_ONLY_STYLUS_MODE ||	\
	 a == AIPTEK_POINTER_EITHER_MODE)

	/* CoordinateMode code
	 */
#define AIPTEK_COORDINATE_RELATIVE_MODE			0
#define AIPTEK_COORDINATE_ABSOLUTE_MODE			1

       /* XTilt and YTilt values
        */
#define AIPTEK_TILT_MIN					(-128)
#define AIPTEK_TILT_MAX					127
#define AIPTEK_TILT_DISABLE				(-10101)

	/* Wheel values
	 */
#define AIPTEK_WHEEL_MIN				0
#define AIPTEK_WHEEL_MAX				1024
#define AIPTEK_WHEEL_DISABLE				(-10101)

	/* ToolCode values, which BTW are 0x140 .. 0x14f
	 * We have things set up such that if the tool button has changed,
	 * the tools get reset.
	 */
	/* toolMode codes
	 */
#define AIPTEK_TOOL_BUTTON_PEN_MODE			BTN_TOOL_PEN
#define AIPTEK_TOOL_BUTTON_PEN_MODE			BTN_TOOL_PEN
#define AIPTEK_TOOL_BUTTON_PENCIL_MODE			BTN_TOOL_PENCIL
#define AIPTEK_TOOL_BUTTON_BRUSH_MODE			BTN_TOOL_BRUSH
#define AIPTEK_TOOL_BUTTON_AIRBRUSH_MODE		BTN_TOOL_AIRBRUSH
#define AIPTEK_TOOL_BUTTON_ERASER_MODE			BTN_TOOL_RUBBER
#define AIPTEK_TOOL_BUTTON_MOUSE_MODE			BTN_TOOL_MOUSE
#define AIPTEK_TOOL_BUTTON_LENS_MODE			BTN_TOOL_LENS

	/* Diagnostic message codes
	 */
#define AIPTEK_DIAGNOSTIC_NA				0
#define AIPTEK_DIAGNOSTIC_SENDING_RELATIVE_IN_ABSOLUTE	1
#define AIPTEK_DIAGNOSTIC_SENDING_ABSOLUTE_IN_RELATIVE	2
#define AIPTEK_DIAGNOSTIC_TOOL_DISALLOWED		3

	/* Time to wait (in ms) to help mask hand jittering
	 * when pressing the stylus buttons.
	 */
#define AIPTEK_JITTER_DELAY_DEFAULT			50

	/* Time to wait (in ms) in-between sending the tablet
	 * a command and beginning the process of reading the return
	 * sequence from the tablet.
	 */
#define AIPTEK_PROGRAMMABLE_DELAY_25		25
#define AIPTEK_PROGRAMMABLE_DELAY_50		50
#define AIPTEK_PROGRAMMABLE_DELAY_100		100
#define AIPTEK_PROGRAMMABLE_DELAY_200		200
#define AIPTEK_PROGRAMMABLE_DELAY_300		300
#define AIPTEK_PROGRAMMABLE_DELAY_400		400
#define AIPTEK_PROGRAMMABLE_DELAY_DEFAULT	AIPTEK_PROGRAMMABLE_DELAY_400

	/* Mouse button programming
	 */
#define AIPTEK_MOUSE_LEFT_BUTTON		0x04
#define AIPTEK_MOUSE_RIGHT_BUTTON		0x08
#define AIPTEK_MOUSE_MIDDLE_BUTTON		0x10

	/* Stylus button programming
	 */
#define AIPTEK_STYLUS_LOWER_BUTTON		0x08
#define AIPTEK_STYLUS_UPPER_BUTTON		0x10

	/* Length of incoming packet from the tablet
	 */
#define AIPTEK_PACKET_LENGTH			8

	/* We report in EV_MISC both the proximity and
	 * whether the report came from the stylus, tablet mouse
	 * or "unknown" -- Unknown when the tablet is in relative
	 * mode, because we only get report 1's.
	 */
#define AIPTEK_REPORT_TOOL_UNKNOWN		0x10
#define AIPTEK_REPORT_TOOL_STYLUS		0x20
#define AIPTEK_REPORT_TOOL_MOUSE		0x40

static int programmableDelay = AIPTEK_PROGRAMMABLE_DELAY_DEFAULT;
static int jitterDelay = AIPTEK_JITTER_DELAY_DEFAULT;

struct aiptek_features {
	int odmCode;		/* Tablet manufacturer code       */
	int modelCode;		/* Tablet model code (not unique) */
	int firmwareCode;	/* prom/eeprom version            */
	char usbPath[64 + 1];	/* device's physical usb path     */
};

struct aiptek_settings {
	int pointerMode;	/* stylus-, mouse-only or either */
	int coordinateMode;	/* absolute/relative coords      */
	int toolMode;		/* pen, pencil, brush, etc. tool */
	int xTilt;		/* synthetic xTilt amount        */
	int yTilt;		/* synthetic yTilt amount        */
	int wheel;		/* synthetic wheel amount        */
	int stylusButtonUpper;	/* stylus upper btn delivers...  */
	int stylusButtonLower;	/* stylus lower btn delivers...  */
	int mouseButtonLeft;	/* mouse left btn delivers...    */
	int mouseButtonMiddle;	/* mouse middle btn delivers...  */
	int mouseButtonRight;	/* mouse right btn delivers...   */
	int programmableDelay;	/* delay for tablet programming  */
	int jitterDelay;	/* delay for hand jittering      */
};

struct aiptek {
	struct input_dev *inputdev;		/* input device struct           */
	struct usb_device *usbdev;		/* usb device struct             */
	struct urb *urb;			/* urb for incoming reports      */
	dma_addr_t data_dma;			/* our dma stuffage              */
	struct aiptek_features features;	/* tablet's array of features    */
	struct aiptek_settings curSetting;	/* tablet's current programmable */
	struct aiptek_settings newSetting;	/* ... and new param settings    */
	unsigned int ifnum;			/* interface number for IO       */
	int diagnostic;				/* tablet diagnostic codes       */
	unsigned long eventCount;		/* event count                   */
	int inDelay;				/* jitter: in jitter delay?      */
	unsigned long endDelay;			/* jitter: time when delay ends  */
	int previousJitterable;			/* jitterable prev value     */

	int lastMacro;				/* macro key to reset            */
	int previousToolMode;			/* pen, pencil, brush, etc. tool */
	unsigned char *data;			/* incoming packet data          */
};

static const int eventTypes[] = {
        EV_KEY, EV_ABS, EV_REL, EV_MSC,
};

static const int absEvents[] = {
        ABS_X, ABS_Y, ABS_PRESSURE, ABS_TILT_X, ABS_TILT_Y,
        ABS_WHEEL, ABS_MISC,
};

static const int relEvents[] = {
        REL_X, REL_Y, REL_WHEEL,
};

static const int buttonEvents[] = {
	BTN_LEFT, BTN_RIGHT, BTN_MIDDLE,
	BTN_TOOL_PEN, BTN_TOOL_RUBBER, BTN_TOOL_PENCIL, BTN_TOOL_AIRBRUSH,
	BTN_TOOL_BRUSH, BTN_TOOL_MOUSE, BTN_TOOL_LENS, BTN_TOUCH,
	BTN_STYLUS, BTN_STYLUS2,
};

/*
 * Permit easy lookup of keyboard events to send, versus
 * the bitmap which comes from the tablet. This hides the
 * issue that the F_keys are not sequentially numbered.
 */
static const int macroKeyEvents[] = {
	KEY_ESC, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5,
	KEY_F6, KEY_F7, KEY_F8, KEY_F9, KEY_F10, KEY_F11,
	KEY_F12, KEY_F13, KEY_F14, KEY_F15, KEY_F16, KEY_F17,
	KEY_F18, KEY_F19, KEY_F20, KEY_F21, KEY_F22, KEY_F23,
	KEY_F24, KEY_STOP, KEY_AGAIN, KEY_PROPS, KEY_UNDO,
	KEY_FRONT, KEY_COPY, KEY_OPEN, KEY_PASTE, 0
};

/***********************************************************************
 * Map values to strings and back. Every map shoudl have the following
 * as its last element: { NULL, AIPTEK_INVALID_VALUE }.
 */
#define AIPTEK_INVALID_VALUE	-1

struct aiptek_map {
	const char *string;
	int value;
};

static int map_str_to_val(const struct aiptek_map *map, const char *str, size_t count)
{
	const struct aiptek_map *p;

	if (str[count - 1] == '\n')
		count--;

	for (p = map; p->string; p++)
	        if (!strncmp(str, p->string, count))
			return p->value;

	return AIPTEK_INVALID_VALUE;
}

static const char *map_val_to_str(const struct aiptek_map *map, int val)
{
	const struct aiptek_map *p;

	for (p = map; p->value != AIPTEK_INVALID_VALUE; p++)
		if (val == p->value)
			return p->string;

	return "unknown";
}

/***********************************************************************
 * aiptek_irq can receive one of six potential reports.
 * The documentation for each is in the body of the function.
 *
 * The tablet reports on several attributes per invocation of
 * aiptek_irq. Because the Linux Input Event system allows the
 * transmission of ONE attribute per input_report_xxx() call,
 * collation has to be done on the other end to reconstitute
 * a complete tablet report. Further, the number of Input Event reports
 * submitted varies, depending on what USB report type, and circumstance.
 * To deal with this, EV_MSC is used to indicate an 'end-of-report'
 * message. This has been an undocumented convention understood by the kernel
 * tablet driver and clients such as gpm and XFree86's tablet drivers.
 *
 * Of the information received from the tablet, the one piece I
 * cannot transmit is the proximity bit (without resorting to an EV_MSC
 * convention above.) I therefore have taken over REL_MISC and ABS_MISC
 * (for relative and absolute reports, respectively) for communicating
 * Proximity. Why two events? I thought it interesting to know if the
 * Proximity event occurred while the tablet was in absolute or relative
 * mode.
 * Update: REL_MISC proved not to be such a good idea. With REL_MISC you
 * get an event transmitted each time. ABS_MISC works better, since it
 * can be set and re-set. Thus, only using ABS_MISC from now on.
 *
 * Other tablets use the notion of a certain minimum stylus pressure
 * to infer proximity. While that could have been done, that is yet
 * another 'by convention' behavior, the documentation for which
 * would be spread between two (or more) pieces of software.
 *
 * EV_MSC usage was terminated for this purpose in Linux 2.5.x, and
 * replaced with the input_sync() method (which emits EV_SYN.)
 */

static void aiptek_irq(struct urb *urb)
{
	struct aiptek *aiptek = urb->context;
	unsigned char *data = aiptek->data;
	struct input_dev *inputdev = aiptek->inputdev;
	int jitterable = 0;
	int retval, macro, x, y, z, left, right, middle, p, dv, tip, bs, pck;

	switch (urb->status) {
	case 0:
		/* Success */
		break;

	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* This urb is terminated, clean up */
		dbg("%s - urb shutting down with status: %d",
		    __FUNCTION__, urb->status);
		return;

	default:
		dbg("%s - nonzero urb status received: %d",
		    __FUNCTION__, urb->status);
		goto exit;
	}

	/* See if we are in a delay loop -- throw out report if true.
	 */
	if (aiptek->inDelay == 1 && time_after(aiptek->endDelay, jiffies)) {
		goto exit;
	}

	aiptek->inDelay = 0;
	aiptek->eventCount++;

	/* Report 1 delivers relative coordinates with either a stylus
	 * or the mouse. You do not know, however, which input
	 * tool generated the event.
	 */
	if (data[0] == 1) {
		if (aiptek->curSetting.coordinateMode ==
		    AIPTEK_COORDINATE_ABSOLUTE_MODE) {
			aiptek->diagnostic =
			    AIPTEK_DIAGNOSTIC_SENDING_RELATIVE_IN_ABSOLUTE;
		} else {
			x = (signed char) data[2];
			y = (signed char) data[3];

			/* jitterable keeps track of whether any button has been pressed.
			 * We're also using it to remap the physical mouse button mask
			 * to pseudo-settings. (We don't specifically care about it's
			 * value after moving/transposing mouse button bitmasks, except
			 * that a non-zero value indicates that one or more
			 * mouse button was pressed.)
			 */
			jitterable = data[1] & 0x07;

			left = (data[1] & aiptek->curSetting.mouseButtonLeft >> 2) != 0 ? 1 : 0;
			right = (data[1] & aiptek->curSetting.mouseButtonRight >> 2) != 0 ? 1 : 0;
			middle = (data[1] & aiptek->curSetting.mouseButtonMiddle >> 2) != 0 ? 1 : 0;

			input_report_key(inputdev, BTN_LEFT, left);
			input_report_key(inputdev, BTN_MIDDLE, middle);
			input_report_key(inputdev, BTN_RIGHT, right);

			input_report_abs(inputdev, ABS_MISC,
					 1 | AIPTEK_REPORT_TOOL_UNKNOWN);
			input_report_rel(inputdev, REL_X, x);
			input_report_rel(inputdev, REL_Y, y);

			/* Wheel support is in the form of a single-event
			 * firing.
			 */
			if (aiptek->curSetting.wheel != AIPTEK_WHEEL_DISABLE) {
				input_report_rel(inputdev, REL_WHEEL,
						 aiptek->curSetting.wheel);
				aiptek->curSetting.wheel = AIPTEK_WHEEL_DISABLE;
			}
			if (aiptek->lastMacro != -1) {
			        input_report_key(inputdev,
						 macroKeyEvents[aiptek->lastMacro], 0);
				aiptek->lastMacro = -1;
			}
			input_sync(inputdev);
		}
	}
	/* Report 2 is delivered only by the stylus, and delivers
	 * absolute coordinates.
	 */
	else if (data[0] == 2) {
		if (aiptek->curSetting.coordinateMode == AIPTEK_COORDINATE_RELATIVE_MODE) {
			aiptek->diagnostic = AIPTEK_DIAGNOSTIC_SENDING_ABSOLUTE_IN_RELATIVE;
		} else if (!AIPTEK_POINTER_ALLOW_STYLUS_MODE
			    (aiptek->curSetting.pointerMode)) {
				aiptek->diagnostic = AIPTEK_DIAGNOSTIC_TOOL_DISALLOWED;
		} else {
			x = le16_to_cpu(get_unaligned((__le16 *) (data + 1)));
			y = le16_to_cpu(get_unaligned((__le16 *) (data + 3)));
			z = le16_to_cpu(get_unaligned((__le16 *) (data + 6)));

			dv = (data[5] & 0x01) != 0 ? 1 : 0;
			p = (data[5] & 0x02) != 0 ? 1 : 0;
			tip = (data[5] & 0x04) != 0 ? 1 : 0;

			/* Use jitterable to re-arrange button masks
			 */
			jitterable = data[5] & 0x18;

			bs = (data[5] & aiptek->curSetting.stylusButtonLower) != 0 ? 1 : 0;
			pck = (data[5] & aiptek->curSetting.stylusButtonUpper) != 0 ? 1 : 0;

			/* dv indicates 'data valid' (e.g., the tablet is in sync
			 * and has delivered a "correct" report) We will ignore
			 * all 'bad' reports...
			 */
			if (dv != 0) {
				/* If the selected tool changed, reset the old
				 * tool key, and set the new one.
				 */
				if (aiptek->previousToolMode !=
				    aiptek->curSetting.toolMode) {
				        input_report_key(inputdev,
							 aiptek->previousToolMode, 0);
					input_report_key(inputdev,
							 aiptek->curSetting.toolMode,
							 1);
					aiptek->previousToolMode =
					          aiptek->curSetting.toolMode;
				}

				if (p != 0) {
					input_report_abs(inputdev, ABS_X, x);
					input_report_abs(inputdev, ABS_Y, y);
					input_report_abs(inputdev, ABS_PRESSURE, z);

					input_report_key(inputdev, BTN_TOUCH, tip);
					input_report_key(inputdev, BTN_STYLUS, bs);
					input_report_key(inputdev, BTN_STYLUS2, pck);

					if (aiptek->curSetting.xTilt !=
					    AIPTEK_TILT_DISABLE) {
						input_report_abs(inputdev,
								 ABS_TILT_X,
								 aiptek->curSetting.xTilt);
					}
					if (aiptek->curSetting.yTilt != AIPTEK_TILT_DISABLE) {
						input_report_abs(inputdev,
								 ABS_TILT_Y,
								 aiptek->curSetting.yTilt);
					}

					/* Wheel support is in the form of a single-event
					 * firing.
					 */
					if (aiptek->curSetting.wheel !=
					    AIPTEK_WHEEL_DISABLE) {
						input_report_abs(inputdev,
								 ABS_WHEEL,
								 aiptek->curSetting.wheel);
						aiptek->curSetting.wheel = AIPTEK_WHEEL_DISABLE;
					}
				}
				input_report_abs(inputdev, ABS_MISC, p | AIPTEK_REPORT_TOOL_STYLUS);
				if (aiptek->lastMacro != -1) {
			                input_report_key(inputdev,
							 macroKeyEvents[aiptek->lastMacro], 0);
					aiptek->lastMacro = -1;
				}
				input_sync(inputdev);
			}
		}
	}
	/* Report 3's come from the mouse in absolute mode.
	 */
	else if (data[0] == 3) {
		if (aiptek->curSetting.coordinateMode == AIPTEK_COORDINATE_RELATIVE_MODE) {
			aiptek->diagnostic = AIPTEK_DIAGNOSTIC_SENDING_ABSOLUTE_IN_RELATIVE;
		} else if (!AIPTEK_POINTER_ALLOW_MOUSE_MODE
			(aiptek->curSetting.pointerMode)) {
			aiptek->diagnostic = AIPTEK_DIAGNOSTIC_TOOL_DISALLOWED;
		} else {
			x = le16_to_cpu(get_unaligned((__le16 *) (data + 1)));
			y = le16_to_cpu(get_unaligned((__le16 *) (data + 3)));

			jitterable = data[5] & 0x1c;

			dv = (data[5] & 0x01) != 0 ? 1 : 0;
			p = (data[5] & 0x02) != 0 ? 1 : 0;
			left = (data[5] & aiptek->curSetting.mouseButtonLeft) != 0 ? 1 : 0;
			right = (data[5] & aiptek->curSetting.mouseButtonRight) != 0 ? 1 : 0;
			middle = (data[5] & aiptek->curSetting.mouseButtonMiddle) != 0 ? 1 : 0;

			if (dv != 0) {
				/* If the selected tool changed, reset the old
				 * tool key, and set the new one.
				 */
				if (aiptek->previousToolMode !=
				    aiptek->curSetting.toolMode) {
				        input_report_key(inputdev,
							 aiptek->previousToolMode, 0);
					input_report_key(inputdev,
							 aiptek->curSetting.toolMode,
							 1);
					aiptek->previousToolMode =
					          aiptek->curSetting.toolMode;
				}

				if (p != 0) {
					input_report_abs(inputdev, ABS_X, x);
					input_report_abs(inputdev, ABS_Y, y);

					input_report_key(inputdev, BTN_LEFT, left);
					input_report_key(inputdev, BTN_MIDDLE, middle);
					input_report_key(inputdev, BTN_RIGHT, right);

					/* Wheel support is in the form of a single-event
					 * firing.
					 */
					if (aiptek->curSetting.wheel != AIPTEK_WHEEL_DISABLE) {
						input_report_abs(inputdev,
								 ABS_WHEEL,
								 aiptek->curSetting.wheel);
						aiptek->curSetting.wheel = AIPTEK_WHEEL_DISABLE;
					}
				}
				input_report_abs(inputdev, ABS_MISC, p | AIPTEK_REPORT_TOOL_MOUSE);
				if (aiptek->lastMacro != -1) {
			                input_report_key(inputdev,
							 macroKeyEvents[aiptek->lastMacro], 0);
				        aiptek->lastMacro = -1;
				}
				input_sync(inputdev);
			}
		}
	}
	/* Report 4s come from the macro keys when pressed by stylus
	 */
	else if (data[0] == 4) {
		jitterable = data[1] & 0x18;

		dv = (data[1] & 0x01) != 0 ? 1 : 0;
		p = (data[1] & 0x02) != 0 ? 1 : 0;
		tip = (data[1] & 0x04) != 0 ? 1 : 0;
		bs = (data[1] & aiptek->curSetting.stylusButtonLower) != 0 ? 1 : 0;
		pck = (data[1] & aiptek->curSetting.stylusButtonUpper) != 0 ? 1 : 0;

		macro = dv && p && tip && !(data[3] & 1) ? (data[3] >> 1) : -1;
		z = le16_to_cpu(get_unaligned((__le16 *) (data + 4)));

		if (dv) {
		        /* If the selected tool changed, reset the old
			 * tool key, and set the new one.
			 */
		        if (aiptek->previousToolMode !=
			    aiptek->curSetting.toolMode) {
			        input_report_key(inputdev,
						 aiptek->previousToolMode, 0);
				input_report_key(inputdev,
						 aiptek->curSetting.toolMode,
						 1);
				aiptek->previousToolMode =
				        aiptek->curSetting.toolMode;
			}
		}

		if (aiptek->lastMacro != -1 && aiptek->lastMacro != macro) {
		        input_report_key(inputdev, macroKeyEvents[aiptek->lastMacro], 0);
			aiptek->lastMacro = -1;
		}

		if (macro != -1 && macro != aiptek->lastMacro) {
			input_report_key(inputdev, macroKeyEvents[macro], 1);
			aiptek->lastMacro = macro;
		}
		input_report_abs(inputdev, ABS_MISC,
				 p | AIPTEK_REPORT_TOOL_STYLUS);
		input_sync(inputdev);
	}
	/* Report 5s come from the macro keys when pressed by mouse
	 */
	else if (data[0] == 5) {
		jitterable = data[1] & 0x1c;

		dv = (data[1] & 0x01) != 0 ? 1 : 0;
		p = (data[1] & 0x02) != 0 ? 1 : 0;
		left = (data[1]& aiptek->curSetting.mouseButtonLeft) != 0 ? 1 : 0;
		right = (data[1] & aiptek->curSetting.mouseButtonRight) != 0 ? 1 : 0;
		middle = (data[1] & aiptek->curSetting.mouseButtonMiddle) != 0 ? 1 : 0;
		macro = dv && p && left && !(data[3] & 1) ? (data[3] >> 1) : 0;

		if (dv) {
		        /* If the selected tool changed, reset the old
			 * tool key, and set the new one.
			 */
		        if (aiptek->previousToolMode !=
			    aiptek->curSetting.toolMode) {
		                input_report_key(inputdev,
						 aiptek->previousToolMode, 0);
			        input_report_key(inputdev,
						 aiptek->curSetting.toolMode, 1);
			        aiptek->previousToolMode = aiptek->curSetting.toolMode;
			}
		}

		if (aiptek->lastMacro != -1 && aiptek->lastMacro != macro) {
		        input_report_key(inputdev, macroKeyEvents[aiptek->lastMacro], 0);
			aiptek->lastMacro = -1;
		}

		if (macro != -1 && macro != aiptek->lastMacro) {
			input_report_key(inputdev, macroKeyEvents[macro], 1);
			aiptek->lastMacro = macro;
		}

		input_report_abs(inputdev, ABS_MISC,
				 p | AIPTEK_REPORT_TOOL_MOUSE);
		input_sync(inputdev);
	}
	/* We have no idea which tool can generate a report 6. Theoretically,
	 * neither need to, having been given reports 4 & 5 for such use.
	 * However, report 6 is the 'official-looking' report for macroKeys;
	 * reports 4 & 5 supposively are used to support unnamed, unknown
	 * hat switches (which just so happen to be the macroKeys.)
	 */
	else if (data[0] == 6) {
		macro = le16_to_cpu(get_unaligned((__le16 *) (data + 1)));
		if (macro > 0) {
			input_report_key(inputdev, macroKeyEvents[macro - 1],
					 0);
		}
		if (macro < 25) {
			input_report_key(inputdev, macroKeyEvents[macro + 1],
					 0);
		}

		/* If the selected tool changed, reset the old
		   tool key, and set the new one.
		*/
		if (aiptek->previousToolMode !=
		    aiptek->curSetting.toolMode) {
		        input_report_key(inputdev,
					 aiptek->previousToolMode, 0);
			input_report_key(inputdev,
					 aiptek->curSetting.toolMode,
					 1);
			aiptek->previousToolMode =
				aiptek->curSetting.toolMode;
		}

		input_report_key(inputdev, macroKeyEvents[macro], 1);
		input_report_abs(inputdev, ABS_MISC,
				 1 | AIPTEK_REPORT_TOOL_UNKNOWN);
		input_sync(inputdev);
	} else {
		dbg("Unknown report %d", data[0]);
	}

	/* Jitter may occur when the user presses a button on the stlyus
	 * or the mouse. What we do to prevent that is wait 'x' milliseconds
	 * following a 'jitterable' event, which should give the hand some time
	 * stabilize itself.
	 *
	 * We just introduced aiptek->previousJitterable to carry forth the
	 * notion that jitter occurs when the button state changes from on to off:
	 * a person drawing, holding a button down is not subject to jittering.
	 * With that in mind, changing from upper button depressed to lower button
	 * WILL transition through a jitter delay.
	 */

	if (aiptek->previousJitterable != jitterable &&
	    aiptek->curSetting.jitterDelay != 0 && aiptek->inDelay != 1) {
		aiptek->endDelay = jiffies +
		    ((aiptek->curSetting.jitterDelay * HZ) / 1000);
		aiptek->inDelay = 1;
	}
	aiptek->previousJitterable = jitterable;

exit:
	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval != 0) {
		err("%s - usb_submit_urb failed with result %d",
		    __FUNCTION__, retval);
	}
}

/***********************************************************************
 * These are the USB id's known so far. We do not identify them to
 * specific Aiptek model numbers, because there has been overlaps,
 * use, and reuse of id's in existing models. Certain models have
 * been known to use more than one ID, indicative perhaps of
 * manufacturing revisions. In any event, we consider these
 * IDs to not be model-specific nor unique.
 */
static const struct usb_device_id aiptek_ids[] = {
	{USB_DEVICE(USB_VENDOR_ID_AIPTEK, 0x01)},
	{USB_DEVICE(USB_VENDOR_ID_AIPTEK, 0x10)},
	{USB_DEVICE(USB_VENDOR_ID_AIPTEK, 0x20)},
	{USB_DEVICE(USB_VENDOR_ID_AIPTEK, 0x21)},
	{USB_DEVICE(USB_VENDOR_ID_AIPTEK, 0x22)},
	{USB_DEVICE(USB_VENDOR_ID_AIPTEK, 0x23)},
	{USB_DEVICE(USB_VENDOR_ID_AIPTEK, 0x24)},
	{}
};

MODULE_DEVICE_TABLE(usb, aiptek_ids);

/***********************************************************************
 * Open an instance of the tablet driver.
 */
static int aiptek_open(struct input_dev *inputdev)
{
	struct aiptek *aiptek = input_get_drvdata(inputdev);

	aiptek->urb->dev = aiptek->usbdev;
	if (usb_submit_urb(aiptek->urb, GFP_KERNEL) != 0)
		return -EIO;

	return 0;
}

/***********************************************************************
 * Close an instance of the tablet driver.
 */
static void aiptek_close(struct input_dev *inputdev)
{
	struct aiptek *aiptek = input_get_drvdata(inputdev);

	usb_kill_urb(aiptek->urb);
}

/***********************************************************************
 * aiptek_set_report and aiptek_get_report() are borrowed from Linux 2.4.x,
 * where they were known as usb_set_report and usb_get_report.
 */
static int
aiptek_set_report(struct aiptek *aiptek,
		  unsigned char report_type,
		  unsigned char report_id, void *buffer, int size)
{
	return usb_control_msg(aiptek->usbdev,
			       usb_sndctrlpipe(aiptek->usbdev, 0),
			       USB_REQ_SET_REPORT,
			       USB_TYPE_CLASS | USB_RECIP_INTERFACE |
			       USB_DIR_OUT, (report_type << 8) + report_id,
			       aiptek->ifnum, buffer, size, 5000);
}

static int
aiptek_get_report(struct aiptek *aiptek,
		  unsigned char report_type,
		  unsigned char report_id, void *buffer, int size)
{
	return usb_control_msg(aiptek->usbdev,
			       usb_rcvctrlpipe(aiptek->usbdev, 0),
			       USB_REQ_GET_REPORT,
			       USB_TYPE_CLASS | USB_RECIP_INTERFACE |
			       USB_DIR_IN, (report_type << 8) + report_id,
			       aiptek->ifnum, buffer, size, 5000);
}

/***********************************************************************
 * Send a command to the tablet.
 */
static int
aiptek_command(struct aiptek *aiptek, unsigned char command, unsigned char data)
{
	const int sizeof_buf = 3 * sizeof(u8);
	int ret;
	u8 *buf;

	buf = kmalloc(sizeof_buf, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	buf[0] = 2;
	buf[1] = command;
	buf[2] = data;

	if ((ret =
	     aiptek_set_report(aiptek, 3, 2, buf, sizeof_buf)) != sizeof_buf) {
		dbg("aiptek_program: failed, tried to send: 0x%02x 0x%02x",
		    command, data);
	}
	kfree(buf);
	return ret < 0 ? ret : 0;
}

/***********************************************************************
 * Retrieve information from the tablet. Querying info is defined as first
 * sending the {command,data} sequence as a command, followed by a wait
 * (aka, "programmaticDelay") and then a "read" request.
 */
static int
aiptek_query(struct aiptek *aiptek, unsigned char command, unsigned char data)
{
	const int sizeof_buf = 3 * sizeof(u8);
	int ret;
	u8 *buf;

	buf = kmalloc(sizeof_buf, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	buf[0] = 2;
	buf[1] = command;
	buf[2] = data;

	if (aiptek_command(aiptek, command, data) != 0) {
		kfree(buf);
		return -EIO;
	}
	msleep(aiptek->curSetting.programmableDelay);

	if ((ret =
	     aiptek_get_report(aiptek, 3, 2, buf, sizeof_buf)) != sizeof_buf) {
		dbg("aiptek_query failed: returned 0x%02x 0x%02x 0x%02x",
		    buf[0], buf[1], buf[2]);
		ret = -EIO;
	} else {
		ret = le16_to_cpu(get_unaligned((__le16 *) (buf + 1)));
	}
	kfree(buf);
	return ret;
}

/***********************************************************************
 * Program the tablet into either absolute or relative mode.
 * We also get information about the tablet's size.
 */
static int aiptek_program_tablet(struct aiptek *aiptek)
{
	int ret;
	/* Execute Resolution500LPI */
	if ((ret = aiptek_command(aiptek, 0x18, 0x04)) < 0)
		return ret;

	/* Query getModelCode */
	if ((ret = aiptek_query(aiptek, 0x02, 0x00)) < 0)
		return ret;
	aiptek->features.modelCode = ret & 0xff;

	/* Query getODMCode */
	if ((ret = aiptek_query(aiptek, 0x03, 0x00)) < 0)
		return ret;
	aiptek->features.odmCode = ret;

	/* Query getFirmwareCode */
	if ((ret = aiptek_query(aiptek, 0x04, 0x00)) < 0)
		return ret;
	aiptek->features.firmwareCode = ret;

	/* Query getXextension */
	if ((ret = aiptek_query(aiptek, 0x01, 0x00)) < 0)
		return ret;
	aiptek->inputdev->absmin[ABS_X] = 0;
	aiptek->inputdev->absmax[ABS_X] = ret - 1;

	/* Query getYextension */
	if ((ret = aiptek_query(aiptek, 0x01, 0x01)) < 0)
		return ret;
	aiptek->inputdev->absmin[ABS_Y] = 0;
	aiptek->inputdev->absmax[ABS_Y] = ret - 1;

	/* Query getPressureLevels */
	if ((ret = aiptek_query(aiptek, 0x08, 0x00)) < 0)
		return ret;
	aiptek->inputdev->absmin[ABS_PRESSURE] = 0;
	aiptek->inputdev->absmax[ABS_PRESSURE] = ret - 1;

	/* Depending on whether we are in absolute or relative mode, we will
	 * do a switchToTablet(absolute) or switchToMouse(relative) command.
	 */
	if (aiptek->curSetting.coordinateMode ==
	    AIPTEK_COORDINATE_ABSOLUTE_MODE) {
		/* Execute switchToTablet */
		if ((ret = aiptek_command(aiptek, 0x10, 0x01)) < 0) {
			return ret;
		}
	} else {
		/* Execute switchToMouse */
		if ((ret = aiptek_command(aiptek, 0x10, 0x00)) < 0) {
			return ret;
		}
	}

	/* Enable the macro keys */
	if ((ret = aiptek_command(aiptek, 0x11, 0x02)) < 0)
		return ret;
#if 0
	/* Execute FilterOn */
	if ((ret = aiptek_command(aiptek, 0x17, 0x00)) < 0)
		return ret;
#endif

	/* Execute AutoGainOn */
	if ((ret = aiptek_command(aiptek, 0x12, 0xff)) < 0)
		return ret;

	/* Reset the eventCount, so we track events from last (re)programming
	 */
	aiptek->diagnostic = AIPTEK_DIAGNOSTIC_NA;
	aiptek->eventCount = 0;

	return 0;
}

/***********************************************************************
 * Sysfs functions. Sysfs prefers that individually-tunable parameters
 * exist in their separate pseudo-files. Summary data that is immutable
 * may exist in a singular file so long as you don't define a writeable
 * interface.
 */

/***********************************************************************
 * support the 'size' file -- display support
 */
static ssize_t show_tabletSize(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%dx%d\n",
			aiptek->inputdev->absmax[ABS_X] + 1,
			aiptek->inputdev->absmax[ABS_Y] + 1);
}

/* These structs define the sysfs files, param #1 is the name of the
 * file, param 2 is the file permissions, param 3 & 4 are to the
 * output generator and input parser routines. Absence of a routine is
 * permitted -- it only means can't either 'cat' the file, or send data
 * to it.
 */
static DEVICE_ATTR(size, S_IRUGO, show_tabletSize, NULL);

/***********************************************************************
 * support routines for the 'pointer_mode' file. Note that this file
 * both displays current setting and allows reprogramming.
 */
static struct aiptek_map pointer_mode_map[] = {
	{ "stylus",	AIPTEK_POINTER_ONLY_STYLUS_MODE },
	{ "mouse",	AIPTEK_POINTER_ONLY_MOUSE_MODE },
	{ "either",	AIPTEK_POINTER_EITHER_MODE },
	{ NULL,		AIPTEK_INVALID_VALUE }
};

static ssize_t show_tabletPointerMode(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%s\n",
			map_val_to_str(pointer_mode_map,
					aiptek->curSetting.pointerMode));
}

static ssize_t
store_tabletPointerMode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);
	int new_mode = map_str_to_val(pointer_mode_map, buf, count);

	if (new_mode == AIPTEK_INVALID_VALUE)
		return -EINVAL;

	aiptek->newSetting.pointerMode = new_mode;
	return count;
}

static DEVICE_ATTR(pointer_mode,
		   S_IRUGO | S_IWUGO,
		   show_tabletPointerMode, store_tabletPointerMode);

/***********************************************************************
 * support routines for the 'coordinate_mode' file. Note that this file
 * both displays current setting and allows reprogramming.
 */

static struct aiptek_map coordinate_mode_map[] = {
	{ "absolute",	AIPTEK_COORDINATE_ABSOLUTE_MODE },
	{ "relative",	AIPTEK_COORDINATE_RELATIVE_MODE },
	{ NULL,		AIPTEK_INVALID_VALUE }
};

static ssize_t show_tabletCoordinateMode(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%s\n",
			map_val_to_str(coordinate_mode_map,
					aiptek->curSetting.coordinateMode));
}

static ssize_t
store_tabletCoordinateMode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);
	int new_mode = map_str_to_val(coordinate_mode_map, buf, count);

	if (new_mode == AIPTEK_INVALID_VALUE)
		return -EINVAL;

	aiptek->newSetting.coordinateMode = new_mode;
	return count;
}

static DEVICE_ATTR(coordinate_mode,
		   S_IRUGO | S_IWUGO,
		   show_tabletCoordinateMode, store_tabletCoordinateMode);

/***********************************************************************
 * support routines for the 'tool_mode' file. Note that this file
 * both displays current setting and allows reprogramming.
 */

static struct aiptek_map tool_mode_map[] = {
	{ "mouse",	AIPTEK_TOOL_BUTTON_MOUSE_MODE },
	{ "eraser",	AIPTEK_TOOL_BUTTON_ERASER_MODE },
	{ "pencil",	AIPTEK_TOOL_BUTTON_PENCIL_MODE },
	{ "pen",	AIPTEK_TOOL_BUTTON_PEN_MODE },
	{ "brush",	AIPTEK_TOOL_BUTTON_BRUSH_MODE },
	{ "airbrush",	AIPTEK_TOOL_BUTTON_AIRBRUSH_MODE },
	{ "lens",	AIPTEK_TOOL_BUTTON_LENS_MODE },
	{ NULL,		AIPTEK_INVALID_VALUE }
};

static ssize_t show_tabletToolMode(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%s\n",
			map_val_to_str(tool_mode_map,
					aiptek->curSetting.toolMode));
}

static ssize_t
store_tabletToolMode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);
	int new_mode = map_str_to_val(tool_mode_map, buf, count);

	if (new_mode == AIPTEK_INVALID_VALUE)
		return -EINVAL;

	aiptek->newSetting.toolMode = new_mode;
	return count;
}

static DEVICE_ATTR(tool_mode,
		   S_IRUGO | S_IWUGO,
		   show_tabletToolMode, store_tabletToolMode);

/***********************************************************************
 * support routines for the 'xtilt' file. Note that this file
 * both displays current setting and allows reprogramming.
 */
static ssize_t show_tabletXtilt(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	if (aiptek->curSetting.xTilt == AIPTEK_TILT_DISABLE) {
		return snprintf(buf, PAGE_SIZE, "disable\n");
	} else {
		return snprintf(buf, PAGE_SIZE, "%d\n",
				aiptek->curSetting.xTilt);
	}
}

static ssize_t
store_tabletXtilt(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);
	int x;

	if (strcmp(buf, "disable") == 0) {
		aiptek->newSetting.xTilt = AIPTEK_TILT_DISABLE;
	} else {
		x = (int)simple_strtol(buf, NULL, 10);
		if (x >= AIPTEK_TILT_MIN && x <= AIPTEK_TILT_MAX) {
			aiptek->newSetting.xTilt = x;
		}
	}
	return count;
}

static DEVICE_ATTR(xtilt,
		   S_IRUGO | S_IWUGO, show_tabletXtilt, store_tabletXtilt);

/***********************************************************************
 * support routines for the 'ytilt' file. Note that this file
 * both displays current setting and allows reprogramming.
 */
static ssize_t show_tabletYtilt(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	if (aiptek->curSetting.yTilt == AIPTEK_TILT_DISABLE) {
		return snprintf(buf, PAGE_SIZE, "disable\n");
	} else {
		return snprintf(buf, PAGE_SIZE, "%d\n",
				aiptek->curSetting.yTilt);
	}
}

static ssize_t
store_tabletYtilt(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);
	int y;

	if (strcmp(buf, "disable") == 0) {
		aiptek->newSetting.yTilt = AIPTEK_TILT_DISABLE;
	} else {
		y = (int)simple_strtol(buf, NULL, 10);
		if (y >= AIPTEK_TILT_MIN && y <= AIPTEK_TILT_MAX) {
			aiptek->newSetting.yTilt = y;
		}
	}
	return count;
}

static DEVICE_ATTR(ytilt,
		   S_IRUGO | S_IWUGO, show_tabletYtilt, store_tabletYtilt);

/***********************************************************************
 * support routines for the 'jitter' file. Note that this file
 * both displays current setting and allows reprogramming.
 */
static ssize_t show_tabletJitterDelay(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%d\n", aiptek->curSetting.jitterDelay);
}

static ssize_t
store_tabletJitterDelay(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	aiptek->newSetting.jitterDelay = (int)simple_strtol(buf, NULL, 10);
	return count;
}

static DEVICE_ATTR(jitter,
		   S_IRUGO | S_IWUGO,
		   show_tabletJitterDelay, store_tabletJitterDelay);

/***********************************************************************
 * support routines for the 'delay' file. Note that this file
 * both displays current setting and allows reprogramming.
 */
static ssize_t show_tabletProgrammableDelay(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%d\n",
			aiptek->curSetting.programmableDelay);
}

static ssize_t
store_tabletProgrammableDelay(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	aiptek->newSetting.programmableDelay = (int)simple_strtol(buf, NULL, 10);
	return count;
}

static DEVICE_ATTR(delay,
		   S_IRUGO | S_IWUGO,
		   show_tabletProgrammableDelay, store_tabletProgrammableDelay);

/***********************************************************************
 * support routines for the 'event_count' file. Note that this file
 * only displays current setting.
 */
static ssize_t show_tabletEventsReceived(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%ld\n", aiptek->eventCount);
}

static DEVICE_ATTR(event_count, S_IRUGO, show_tabletEventsReceived, NULL);

/***********************************************************************
 * support routines for the 'diagnostic' file. Note that this file
 * only displays current setting.
 */
static ssize_t show_tabletDiagnosticMessage(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);
	char *retMsg;

	switch (aiptek->diagnostic) {
	case AIPTEK_DIAGNOSTIC_NA:
		retMsg = "no errors\n";
		break;

	case AIPTEK_DIAGNOSTIC_SENDING_RELATIVE_IN_ABSOLUTE:
		retMsg = "Error: receiving relative reports\n";
		break;

	case AIPTEK_DIAGNOSTIC_SENDING_ABSOLUTE_IN_RELATIVE:
		retMsg = "Error: receiving absolute reports\n";
		break;

	case AIPTEK_DIAGNOSTIC_TOOL_DISALLOWED:
		if (aiptek->curSetting.pointerMode ==
		    AIPTEK_POINTER_ONLY_MOUSE_MODE) {
			retMsg = "Error: receiving stylus reports\n";
		} else {
			retMsg = "Error: receiving mouse reports\n";
		}
		break;

	default:
		return 0;
	}
	return snprintf(buf, PAGE_SIZE, retMsg);
}

static DEVICE_ATTR(diagnostic, S_IRUGO, show_tabletDiagnosticMessage, NULL);

/***********************************************************************
 * support routines for the 'stylus_upper' file. Note that this file
 * both displays current setting and allows for setting changing.
 */

static struct aiptek_map stylus_button_map[] = {
	{ "upper",	AIPTEK_STYLUS_UPPER_BUTTON },
	{ "lower",	AIPTEK_STYLUS_LOWER_BUTTON },
	{ NULL,		AIPTEK_INVALID_VALUE }
};

static ssize_t show_tabletStylusUpper(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%s\n",
			map_val_to_str(stylus_button_map,
					aiptek->curSetting.stylusButtonUpper));
}

static ssize_t
store_tabletStylusUpper(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);
	int new_button = map_str_to_val(stylus_button_map, buf, count);

	if (new_button == AIPTEK_INVALID_VALUE)
		return -EINVAL;

	aiptek->newSetting.stylusButtonUpper = new_button;
	return count;
}

static DEVICE_ATTR(stylus_upper,
		   S_IRUGO | S_IWUGO,
		   show_tabletStylusUpper, store_tabletStylusUpper);

/***********************************************************************
 * support routines for the 'stylus_lower' file. Note that this file
 * both displays current setting and allows for setting changing.
 */

static ssize_t show_tabletStylusLower(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%s\n",
			map_val_to_str(stylus_button_map,
					aiptek->curSetting.stylusButtonLower));
}

static ssize_t
store_tabletStylusLower(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);
	int new_button = map_str_to_val(stylus_button_map, buf, count);

	if (new_button == AIPTEK_INVALID_VALUE)
		return -EINVAL;

	aiptek->newSetting.stylusButtonLower = new_button;
	return count;
}

static DEVICE_ATTR(stylus_lower,
		   S_IRUGO | S_IWUGO,
		   show_tabletStylusLower, store_tabletStylusLower);

/***********************************************************************
 * support routines for the 'mouse_left' file. Note that this file
 * both displays current setting and allows for setting changing.
 */

static struct aiptek_map mouse_button_map[] = {
	{ "left",	AIPTEK_MOUSE_LEFT_BUTTON },
	{ "middle",	AIPTEK_MOUSE_MIDDLE_BUTTON },
	{ "right",	AIPTEK_MOUSE_RIGHT_BUTTON },
	{ NULL,		AIPTEK_INVALID_VALUE }
};

static ssize_t show_tabletMouseLeft(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%s\n",
			map_val_to_str(mouse_button_map,
					aiptek->curSetting.mouseButtonLeft));
}

static ssize_t
store_tabletMouseLeft(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);
	int new_button = map_str_to_val(mouse_button_map, buf, count);

	if (new_button == AIPTEK_INVALID_VALUE)
		return -EINVAL;

	aiptek->newSetting.mouseButtonLeft = new_button;
	return count;
}

static DEVICE_ATTR(mouse_left,
		   S_IRUGO | S_IWUGO,
		   show_tabletMouseLeft, store_tabletMouseLeft);

/***********************************************************************
 * support routines for the 'mouse_middle' file. Note that this file
 * both displays current setting and allows for setting changing.
 */
static ssize_t show_tabletMouseMiddle(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%s\n",
			map_val_to_str(mouse_button_map,
					aiptek->curSetting.mouseButtonMiddle));
}

static ssize_t
store_tabletMouseMiddle(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);
	int new_button = map_str_to_val(mouse_button_map, buf, count);

	if (new_button == AIPTEK_INVALID_VALUE)
		return -EINVAL;

	aiptek->newSetting.mouseButtonMiddle = new_button;
	return count;
}

static DEVICE_ATTR(mouse_middle,
		   S_IRUGO | S_IWUGO,
		   show_tabletMouseMiddle, store_tabletMouseMiddle);

/***********************************************************************
 * support routines for the 'mouse_right' file. Note that this file
 * both displays current setting and allows for setting changing.
 */
static ssize_t show_tabletMouseRight(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%s\n",
			map_val_to_str(mouse_button_map,
					aiptek->curSetting.mouseButtonRight));
}

static ssize_t
store_tabletMouseRight(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);
	int new_button = map_str_to_val(mouse_button_map, buf, count);

	if (new_button == AIPTEK_INVALID_VALUE)
		return -EINVAL;

	aiptek->newSetting.mouseButtonRight = new_button;
	return count;
}

static DEVICE_ATTR(mouse_right,
		   S_IRUGO | S_IWUGO,
		   show_tabletMouseRight, store_tabletMouseRight);

/***********************************************************************
 * support routines for the 'wheel' file. Note that this file
 * both displays current setting and allows for setting changing.
 */
static ssize_t show_tabletWheel(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	if (aiptek->curSetting.wheel == AIPTEK_WHEEL_DISABLE) {
		return snprintf(buf, PAGE_SIZE, "disable\n");
	} else {
		return snprintf(buf, PAGE_SIZE, "%d\n",
				aiptek->curSetting.wheel);
	}
}

static ssize_t
store_tabletWheel(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	aiptek->newSetting.wheel = (int)simple_strtol(buf, NULL, 10);
	return count;
}

static DEVICE_ATTR(wheel,
		   S_IRUGO | S_IWUGO, show_tabletWheel, store_tabletWheel);

/***********************************************************************
 * support routines for the 'execute' file. Note that this file
 * both displays current setting and allows for setting changing.
 */
static ssize_t show_tabletExecute(struct device *dev, struct device_attribute *attr, char *buf)
{
	/* There is nothing useful to display, so a one-line manual
	 * is in order...
	 */
	return snprintf(buf, PAGE_SIZE,
			"Write anything to this file to program your tablet.\n");
}

static ssize_t
store_tabletExecute(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	/* We do not care what you write to this file. Merely the action
	 * of writing to this file triggers a tablet reprogramming.
	 */
	memcpy(&aiptek->curSetting, &aiptek->newSetting,
	       sizeof(struct aiptek_settings));

	if (aiptek_program_tablet(aiptek) < 0)
		return -EIO;

	return count;
}

static DEVICE_ATTR(execute,
		   S_IRUGO | S_IWUGO, show_tabletExecute, store_tabletExecute);

/***********************************************************************
 * support routines for the 'odm_code' file. Note that this file
 * only displays current setting.
 */
static ssize_t show_tabletODMCode(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "0x%04x\n", aiptek->features.odmCode);
}

static DEVICE_ATTR(odm_code, S_IRUGO, show_tabletODMCode, NULL);

/***********************************************************************
 * support routines for the 'model_code' file. Note that this file
 * only displays current setting.
 */
static ssize_t show_tabletModelCode(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "0x%04x\n", aiptek->features.modelCode);
}

static DEVICE_ATTR(model_code, S_IRUGO, show_tabletModelCode, NULL);

/***********************************************************************
 * support routines for the 'firmware_code' file. Note that this file
 * only displays current setting.
 */
static ssize_t show_firmwareCode(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%04x\n",
			aiptek->features.firmwareCode);
}

static DEVICE_ATTR(firmware_code, S_IRUGO, show_firmwareCode, NULL);

static struct attribute *aiptek_attributes[] = {
	&dev_attr_size.attr,
	&dev_attr_pointer_mode.attr,
	&dev_attr_coordinate_mode.attr,
	&dev_attr_tool_mode.attr,
	&dev_attr_xtilt.attr,
	&dev_attr_ytilt.attr,
	&dev_attr_jitter.attr,
	&dev_attr_delay.attr,
	&dev_attr_event_count.attr,
	&dev_attr_diagnostic.attr,
	&dev_attr_odm_code.attr,
	&dev_attr_model_code.attr,
	&dev_attr_firmware_code.attr,
	&dev_attr_stylus_lower.attr,
	&dev_attr_stylus_upper.attr,
	&dev_attr_mouse_left.attr,
	&dev_attr_mouse_middle.attr,
	&dev_attr_mouse_right.attr,
	&dev_attr_wheel.attr,
	&dev_attr_execute.attr,
	NULL
};

static struct attribute_group aiptek_attribute_group = {
	.attrs	= aiptek_attributes,
};

/***********************************************************************
 * This routine is called when a tablet has been identified. It basically
 * sets up the tablet and the driver's internal structures.
 */
static int
aiptek_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	struct usb_device *usbdev = interface_to_usbdev(intf);
	struct usb_endpoint_descriptor *endpoint;
	struct aiptek *aiptek;
	struct input_dev *inputdev;
	int i;
	int speeds[] = { 0,
		AIPTEK_PROGRAMMABLE_DELAY_50,
		AIPTEK_PROGRAMMABLE_DELAY_400,
		AIPTEK_PROGRAMMABLE_DELAY_25,
		AIPTEK_PROGRAMMABLE_DELAY_100,
		AIPTEK_PROGRAMMABLE_DELAY_200,
		AIPTEK_PROGRAMMABLE_DELAY_300
	};
	int err = -ENOMEM;

	/* programmableDelay is where the command-line specified
	 * delay is kept. We make it the first element of speeds[],
	 * so therefore, your override speed is tried first, then the
	 * remainder. Note that the default value of 400ms will be tried
	 * if you do not specify any command line parameter.
	 */
	speeds[0] = programmableDelay;

	aiptek = kzalloc(sizeof(struct aiptek), GFP_KERNEL);
	inputdev = input_allocate_device();
	if (!aiptek || !inputdev) {
		warn("aiptek: cannot allocate memory or input device");
		goto fail1;
        }

	aiptek->data = usb_buffer_alloc(usbdev, AIPTEK_PACKET_LENGTH,
					GFP_ATOMIC, &aiptek->data_dma);
        if (!aiptek->data) {
		warn("aiptek: cannot allocate usb buffer");
		goto fail1;
	}

	aiptek->urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!aiptek->urb) {
	        warn("aiptek: cannot allocate urb");
		goto fail2;
	}

	aiptek->inputdev = inputdev;
	aiptek->usbdev = usbdev;
	aiptek->ifnum = intf->altsetting[0].desc.bInterfaceNumber;
	aiptek->inDelay = 0;
	aiptek->endDelay = 0;
	aiptek->previousJitterable = 0;
	aiptek->lastMacro = -1;

	/* Set up the curSettings struct. Said struct contains the current
	 * programmable parameters. The newSetting struct contains changes
	 * the user makes to the settings via the sysfs interface. Those
	 * changes are not "committed" to curSettings until the user
	 * writes to the sysfs/.../execute file.
	 */
	aiptek->curSetting.pointerMode = AIPTEK_POINTER_EITHER_MODE;
	aiptek->curSetting.coordinateMode = AIPTEK_COORDINATE_ABSOLUTE_MODE;
	aiptek->curSetting.toolMode = AIPTEK_TOOL_BUTTON_PEN_MODE;
	aiptek->curSetting.xTilt = AIPTEK_TILT_DISABLE;
	aiptek->curSetting.yTilt = AIPTEK_TILT_DISABLE;
	aiptek->curSetting.mouseButtonLeft = AIPTEK_MOUSE_LEFT_BUTTON;
	aiptek->curSetting.mouseButtonMiddle = AIPTEK_MOUSE_MIDDLE_BUTTON;
	aiptek->curSetting.mouseButtonRight = AIPTEK_MOUSE_RIGHT_BUTTON;
	aiptek->curSetting.stylusButtonUpper = AIPTEK_STYLUS_UPPER_BUTTON;
	aiptek->curSetting.stylusButtonLower = AIPTEK_STYLUS_LOWER_BUTTON;
	aiptek->curSetting.jitterDelay = jitterDelay;
	aiptek->curSetting.programmableDelay = programmableDelay;

	/* Both structs should have equivalent settings
	 */
	aiptek->newSetting = aiptek->curSetting;

	/* Determine the usb devices' physical path.
	 * Asketh not why we always pretend we're using "../input0",
	 * but I suspect this will have to be refactored one
	 * day if a single USB device can be a keyboard & a mouse
	 * & a tablet, and the inputX number actually will tell
	 * us something...
	 */
	usb_make_path(usbdev, aiptek->features.usbPath,
			sizeof(aiptek->features.usbPath));
	strlcat(aiptek->features.usbPath, "/input0",
		sizeof(aiptek->features.usbPath));

	/* Set up client data, pointers to open and close routines
	 * for the input device.
	 */
	inputdev->name = "Aiptek";
	inputdev->phys = aiptek->features.usbPath;
	usb_to_input_id(usbdev, &inputdev->id);
	inputdev->dev.parent = &intf->dev;

	input_set_drvdata(inputdev, aiptek);

	inputdev->open = aiptek_open;
	inputdev->close = aiptek_close;

	/* Now program the capacities of the tablet, in terms of being
	 * an input device.
	 */
	for (i = 0; i < ARRAY_SIZE(eventTypes); ++i)
	        __set_bit(eventTypes[i], inputdev->evbit);

	for (i = 0; i < ARRAY_SIZE(absEvents); ++i)
	        __set_bit(absEvents[i], inputdev->absbit);

	for (i = 0; i < ARRAY_SIZE(relEvents); ++i)
	        __set_bit(relEvents[i], inputdev->relbit);

	__set_bit(MSC_SERIAL, inputdev->mscbit);

	/* Set up key and button codes */
	for (i = 0; i < ARRAY_SIZE(buttonEvents); ++i)
		__set_bit(buttonEvents[i], inputdev->keybit);

	for (i = 0; i < ARRAY_SIZE(macroKeyEvents); ++i)
		__set_bit(macroKeyEvents[i], inputdev->keybit);

	/*
	 * Program the input device coordinate capacities. We do not yet
	 * know what maximum X, Y, and Z values are, so we're putting fake
	 * values in. Later, we'll ask the tablet to put in the correct
	 * values.
	 */
	input_set_abs_params(inputdev, ABS_X, 0, 2999, 0, 0);
	input_set_abs_params(inputdev, ABS_Y, 0, 2249, 0, 0);
	input_set_abs_params(inputdev, ABS_PRESSURE, 0, 511, 0, 0);
	input_set_abs_params(inputdev, ABS_TILT_X, AIPTEK_TILT_MIN, AIPTEK_TILT_MAX, 0, 0);
	input_set_abs_params(inputdev, ABS_TILT_Y, AIPTEK_TILT_MIN, AIPTEK_TILT_MAX, 0, 0);
	input_set_abs_params(inputdev, ABS_WHEEL, AIPTEK_WHEEL_MIN, AIPTEK_WHEEL_MAX - 1, 0, 0);

	endpoint = &intf->altsetting[0].endpoint[0].desc;

	/* Go set up our URB, which is called when the tablet receives
	 * input.
	 */
	usb_fill_int_urb(aiptek->urb,
			 aiptek->usbdev,
			 usb_rcvintpipe(aiptek->usbdev,
					endpoint->bEndpointAddress),
			 aiptek->data, 8, aiptek_irq, aiptek,
			 endpoint->bInterval);

	aiptek->urb->transfer_dma = aiptek->data_dma;
	aiptek->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

	/* Program the tablet. This sets the tablet up in the mode
	 * specified in newSetting, and also queries the tablet's
	 * physical capacities.
	 *
	 * Sanity check: if a tablet doesn't like the slow programmatic
	 * delay, we often get sizes of 0x0. Let's use that as an indicator
	 * to try faster delays, up to 25 ms. If that logic fails, well, you'll
	 * have to explain to us how your tablet thinks it's 0x0, and yet that's
	 * not an error :-)
	 */

	for (i = 0; i < ARRAY_SIZE(speeds); ++i) {
		aiptek->curSetting.programmableDelay = speeds[i];
		(void)aiptek_program_tablet(aiptek);
		if (aiptek->inputdev->absmax[ABS_X] > 0) {
			info("input: Aiptek using %d ms programming speed\n",
			     aiptek->curSetting.programmableDelay);
			break;
		}
	}

	/* Murphy says that some day someone will have a tablet that fails the
	   above test. That's you, Frederic Rodrigo */
	if (i == ARRAY_SIZE(speeds)) {
		info("input: Aiptek tried all speeds, no sane response");
		goto fail2;
	}

	/* Associate this driver's struct with the usb interface.
	 */
	usb_set_intfdata(intf, aiptek);

	/* Set up the sysfs files
	 */
	err = sysfs_create_group(&intf->dev.kobj, &aiptek_attribute_group);
	if (err) {
		warn("aiptek: cannot create sysfs group err: %d", err);
		goto fail3;
        }

	/* Register the tablet as an Input Device
	 */
	err = input_register_device(aiptek->inputdev);
	if (err) {
		warn("aiptek: input_register_device returned err: %d", err);
		goto fail4;
        }
	return 0;

 fail4:	sysfs_remove_group(&intf->dev.kobj, &aiptek_attribute_group);
 fail3: usb_free_urb(aiptek->urb);
 fail2:	usb_buffer_free(usbdev, AIPTEK_PACKET_LENGTH, aiptek->data,
			aiptek->data_dma);
 fail1: usb_set_intfdata(intf, NULL);
	input_free_device(inputdev);
	kfree(aiptek);
	return err;
}

/***********************************************************************
 * Deal with tablet disconnecting from the system.
 */
static void aiptek_disconnect(struct usb_interface *intf)
{
	struct aiptek *aiptek = usb_get_intfdata(intf);

	/* Disassociate driver's struct with usb interface
	 */
	usb_set_intfdata(intf, NULL);
	if (aiptek != NULL) {
		/* Free & unhook everything from the system.
		 */
		usb_kill_urb(aiptek->urb);
		input_unregister_device(aiptek->inputdev);
		sysfs_remove_group(&intf->dev.kobj, &aiptek_attribute_group);
		usb_free_urb(aiptek->urb);
		usb_buffer_free(interface_to_usbdev(intf),
				AIPTEK_PACKET_LENGTH,
				aiptek->data, aiptek->data_dma);
		kfree(aiptek);
	}
}

static struct usb_driver aiptek_driver = {
	.name = "aiptek",
	.probe = aiptek_probe,
	.disconnect = aiptek_disconnect,
	.id_table = aiptek_ids,
};

static int __init aiptek_init(void)
{
	int result = usb_register(&aiptek_driver);
	if (result == 0) {
		info(DRIVER_VERSION ": " DRIVER_AUTHOR);
		info(DRIVER_DESC);
	}
	return result;
}

static void __exit aiptek_exit(void)
{
	usb_deregister(&aiptek_driver);
}

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

module_param(programmableDelay, int, 0);
MODULE_PARM_DESC(programmableDelay, "delay used during tablet programming");
module_param(jitterDelay, int, 0);
MODULE_PARM_DESC(jitterDelay, "stylus/mouse settlement delay");

module_init(aiptek_init);
module_exit(aiptek_exit);