summaryrefslogtreecommitdiffstats
path: root/drivers/input/touchscreen/atmel_mxt_ts.c
blob: c5622058c22bba77b14ed336b764dc7b1ac6c617 (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
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
/*
 * Atmel maXTouch Touchscreen driver
 *
 * Copyright (C) 2010 Samsung Electronics Co.Ltd
 * Copyright (C) 2011-2014 Atmel Corporation
 * Copyright (C) 2012 Google, Inc.
 *
 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */

#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/i2c.h>
#include <linux/platform_data/atmel_mxt_ts.h>
#include <linux/input/mt.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <asm/unaligned.h>

/* Firmware files */
#define MXT_FW_NAME		"maxtouch.fw"
#define MXT_CFG_NAME		"maxtouch.cfg"
#define MXT_CFG_MAGIC		"OBP_RAW V1"

/* Registers */
#define MXT_OBJECT_START	0x07
#define MXT_OBJECT_SIZE		6
#define MXT_INFO_CHECKSUM_SIZE	3
#define MXT_MAX_BLOCK_WRITE	256

/* Object types */
#define MXT_DEBUG_DIAGNOSTIC_T37	37
#define MXT_GEN_MESSAGE_T5		5
#define MXT_GEN_COMMAND_T6		6
#define MXT_GEN_POWER_T7		7
#define MXT_GEN_ACQUIRE_T8		8
#define MXT_GEN_DATASOURCE_T53		53
#define MXT_TOUCH_MULTI_T9		9
#define MXT_TOUCH_KEYARRAY_T15		15
#define MXT_TOUCH_PROXIMITY_T23		23
#define MXT_TOUCH_PROXKEY_T52		52
#define MXT_PROCI_GRIPFACE_T20		20
#define MXT_PROCG_NOISE_T22		22
#define MXT_PROCI_ONETOUCH_T24		24
#define MXT_PROCI_TWOTOUCH_T27		27
#define MXT_PROCI_GRIP_T40		40
#define MXT_PROCI_PALM_T41		41
#define MXT_PROCI_TOUCHSUPPRESSION_T42	42
#define MXT_PROCI_STYLUS_T47		47
#define MXT_PROCG_NOISESUPPRESSION_T48	48
#define MXT_SPT_COMMSCONFIG_T18		18
#define MXT_SPT_GPIOPWM_T19		19
#define MXT_SPT_SELFTEST_T25		25
#define MXT_SPT_CTECONFIG_T28		28
#define MXT_SPT_USERDATA_T38		38
#define MXT_SPT_DIGITIZER_T43		43
#define MXT_SPT_MESSAGECOUNT_T44	44
#define MXT_SPT_CTECONFIG_T46		46
#define MXT_TOUCH_MULTITOUCHSCREEN_T100 100

/* MXT_GEN_MESSAGE_T5 object */
#define MXT_RPTID_NOMSG		0xff

/* MXT_GEN_COMMAND_T6 field */
#define MXT_COMMAND_RESET	0
#define MXT_COMMAND_BACKUPNV	1
#define MXT_COMMAND_CALIBRATE	2
#define MXT_COMMAND_REPORTALL	3
#define MXT_COMMAND_DIAGNOSTIC	5

/* Define for T6 status byte */
#define MXT_T6_STATUS_RESET	(1 << 7)
#define MXT_T6_STATUS_OFL	(1 << 6)
#define MXT_T6_STATUS_SIGERR	(1 << 5)
#define MXT_T6_STATUS_CAL	(1 << 4)
#define MXT_T6_STATUS_CFGERR	(1 << 3)
#define MXT_T6_STATUS_COMSERR	(1 << 2)

/* MXT_GEN_POWER_T7 field */
struct t7_config {
	u8 idle;
	u8 active;
} __packed;

#define MXT_POWER_CFG_RUN		0
#define MXT_POWER_CFG_DEEPSLEEP		1

/* MXT_TOUCH_MULTI_T9 field */
#define MXT_T9_CTRL		0
#define MXT_T9_ORIENT		9
#define MXT_T9_RANGE		18

/* MXT_TOUCH_MULTI_T9 status */
#define MXT_T9_UNGRIP		(1 << 0)
#define MXT_T9_SUPPRESS		(1 << 1)
#define MXT_T9_AMP		(1 << 2)
#define MXT_T9_VECTOR		(1 << 3)
#define MXT_T9_MOVE		(1 << 4)
#define MXT_T9_RELEASE		(1 << 5)
#define MXT_T9_PRESS		(1 << 6)
#define MXT_T9_DETECT		(1 << 7)

struct t9_range {
	u16 x;
	u16 y;
} __packed;

/* MXT_TOUCH_MULTI_T9 orient */
#define MXT_T9_ORIENT_SWITCH	(1 << 0)

/* MXT_SPT_COMMSCONFIG_T18 */
#define MXT_COMMS_CTRL		0
#define MXT_COMMS_CMD		1

/* Define for MXT_GEN_COMMAND_T6 */
#define MXT_BOOT_VALUE		0xa5
#define MXT_RESET_VALUE		0x01
#define MXT_BACKUP_VALUE	0x55

/* T100 Multiple Touch Touchscreen */
#define MXT_T100_CTRL		0
#define MXT_T100_CFG1		1
#define MXT_T100_TCHAUX		3
#define MXT_T100_XRANGE		13
#define MXT_T100_YRANGE		24

#define MXT_T100_CFG_SWITCHXY	BIT(5)

#define MXT_T100_TCHAUX_VECT	BIT(0)
#define MXT_T100_TCHAUX_AMPL	BIT(1)
#define MXT_T100_TCHAUX_AREA	BIT(2)

#define MXT_T100_DETECT		BIT(7)
#define MXT_T100_TYPE_MASK	0x70

enum t100_type {
	MXT_T100_TYPE_FINGER		= 1,
	MXT_T100_TYPE_PASSIVE_STYLUS	= 2,
	MXT_T100_TYPE_HOVERING_FINGER	= 4,
	MXT_T100_TYPE_GLOVE		= 5,
	MXT_T100_TYPE_LARGE_TOUCH	= 6,
};

#define MXT_DISTANCE_ACTIVE_TOUCH	0
#define MXT_DISTANCE_HOVERING		1

#define MXT_TOUCH_MAJOR_DEFAULT		1
#define MXT_PRESSURE_DEFAULT		1

/* Delay times */
#define MXT_BACKUP_TIME		50	/* msec */
#define MXT_RESET_TIME		200	/* msec */
#define MXT_RESET_TIMEOUT	3000	/* msec */
#define MXT_CRC_TIMEOUT		1000	/* msec */
#define MXT_FW_RESET_TIME	3000	/* msec */
#define MXT_FW_CHG_TIMEOUT	300	/* msec */

/* Command to unlock bootloader */
#define MXT_UNLOCK_CMD_MSB	0xaa
#define MXT_UNLOCK_CMD_LSB	0xdc

/* Bootloader mode status */
#define MXT_WAITING_BOOTLOAD_CMD	0xc0	/* valid 7 6 bit only */
#define MXT_WAITING_FRAME_DATA	0x80	/* valid 7 6 bit only */
#define MXT_FRAME_CRC_CHECK	0x02
#define MXT_FRAME_CRC_FAIL	0x03
#define MXT_FRAME_CRC_PASS	0x04
#define MXT_APP_CRC_FAIL	0x40	/* valid 7 8 bit only */
#define MXT_BOOT_STATUS_MASK	0x3f
#define MXT_BOOT_EXTENDED_ID	(1 << 5)
#define MXT_BOOT_ID_MASK	0x1f

/* Touchscreen absolute values */
#define MXT_MAX_AREA		0xff

#define MXT_PIXELS_PER_MM	20

struct mxt_info {
	u8 family_id;
	u8 variant_id;
	u8 version;
	u8 build;
	u8 matrix_xsize;
	u8 matrix_ysize;
	u8 object_num;
};

struct mxt_object {
	u8 type;
	u16 start_address;
	u8 size_minus_one;
	u8 instances_minus_one;
	u8 num_report_ids;
} __packed;

/* Each client has this additional data */
struct mxt_data {
	struct i2c_client *client;
	struct input_dev *input_dev;
	char phys[64];		/* device physical location */
	const struct mxt_platform_data *pdata;
	struct mxt_object *object_table;
	struct mxt_info info;
	unsigned int irq;
	unsigned int max_x;
	unsigned int max_y;
	bool in_bootloader;
	u16 mem_size;
	u8 t100_aux_ampl;
	u8 t100_aux_area;
	u8 t100_aux_vect;
	u8 max_reportid;
	u32 config_crc;
	u32 info_crc;
	u8 bootloader_addr;
	u8 *msg_buf;
	u8 t6_status;
	bool update_input;
	u8 last_message_count;
	u8 num_touchids;
	u8 multitouch;
	struct t7_config t7_cfg;

	/* Cached parameters from object table */
	u16 T5_address;
	u8 T5_msg_size;
	u8 T6_reportid;
	u16 T6_address;
	u16 T7_address;
	u8 T9_reportid_min;
	u8 T9_reportid_max;
	u8 T19_reportid;
	u16 T44_address;
	u8 T100_reportid_min;
	u8 T100_reportid_max;

	/* for fw update in bootloader */
	struct completion bl_completion;

	/* for reset handling */
	struct completion reset_completion;

	/* for config update handling */
	struct completion crc_completion;
};

static size_t mxt_obj_size(const struct mxt_object *obj)
{
	return obj->size_minus_one + 1;
}

static size_t mxt_obj_instances(const struct mxt_object *obj)
{
	return obj->instances_minus_one + 1;
}

static bool mxt_object_readable(unsigned int type)
{
	switch (type) {
	case MXT_GEN_COMMAND_T6:
	case MXT_GEN_POWER_T7:
	case MXT_GEN_ACQUIRE_T8:
	case MXT_GEN_DATASOURCE_T53:
	case MXT_TOUCH_MULTI_T9:
	case MXT_TOUCH_KEYARRAY_T15:
	case MXT_TOUCH_PROXIMITY_T23:
	case MXT_TOUCH_PROXKEY_T52:
	case MXT_PROCI_GRIPFACE_T20:
	case MXT_PROCG_NOISE_T22:
	case MXT_PROCI_ONETOUCH_T24:
	case MXT_PROCI_TWOTOUCH_T27:
	case MXT_PROCI_GRIP_T40:
	case MXT_PROCI_PALM_T41:
	case MXT_PROCI_TOUCHSUPPRESSION_T42:
	case MXT_PROCI_STYLUS_T47:
	case MXT_PROCG_NOISESUPPRESSION_T48:
	case MXT_SPT_COMMSCONFIG_T18:
	case MXT_SPT_GPIOPWM_T19:
	case MXT_SPT_SELFTEST_T25:
	case MXT_SPT_CTECONFIG_T28:
	case MXT_SPT_USERDATA_T38:
	case MXT_SPT_DIGITIZER_T43:
	case MXT_SPT_CTECONFIG_T46:
		return true;
	default:
		return false;
	}
}

static void mxt_dump_message(struct mxt_data *data, u8 *message)
{
	dev_dbg(&data->client->dev, "message: %*ph\n",
		data->T5_msg_size, message);
}

static int mxt_wait_for_completion(struct mxt_data *data,
				   struct completion *comp,
				   unsigned int timeout_ms)
{
	struct device *dev = &data->client->dev;
	unsigned long timeout = msecs_to_jiffies(timeout_ms);
	long ret;

	ret = wait_for_completion_interruptible_timeout(comp, timeout);
	if (ret < 0) {
		return ret;
	} else if (ret == 0) {
		dev_err(dev, "Wait for completion timed out.\n");
		return -ETIMEDOUT;
	}
	return 0;
}

static int mxt_bootloader_read(struct mxt_data *data,
			       u8 *val, unsigned int count)
{
	int ret;
	struct i2c_msg msg;

	msg.addr = data->bootloader_addr;
	msg.flags = data->client->flags & I2C_M_TEN;
	msg.flags |= I2C_M_RD;
	msg.len = count;
	msg.buf = val;

	ret = i2c_transfer(data->client->adapter, &msg, 1);
	if (ret == 1) {
		ret = 0;
	} else {
		ret = ret < 0 ? ret : -EIO;
		dev_err(&data->client->dev, "%s: i2c recv failed (%d)\n",
			__func__, ret);
	}

	return ret;
}

static int mxt_bootloader_write(struct mxt_data *data,
				const u8 * const val, unsigned int count)
{
	int ret;
	struct i2c_msg msg;

	msg.addr = data->bootloader_addr;
	msg.flags = data->client->flags & I2C_M_TEN;
	msg.len = count;
	msg.buf = (u8 *)val;

	ret = i2c_transfer(data->client->adapter, &msg, 1);
	if (ret == 1) {
		ret = 0;
	} else {
		ret = ret < 0 ? ret : -EIO;
		dev_err(&data->client->dev, "%s: i2c send failed (%d)\n",
			__func__, ret);
	}

	return ret;
}

static int mxt_lookup_bootloader_address(struct mxt_data *data, bool retry)
{
	u8 appmode = data->client->addr;
	u8 bootloader;

	switch (appmode) {
	case 0x4a:
	case 0x4b:
		/* Chips after 1664S use different scheme */
		if (retry || data->info.family_id >= 0xa2) {
			bootloader = appmode - 0x24;
			break;
		}
		/* Fall through for normal case */
	case 0x4c:
	case 0x4d:
	case 0x5a:
	case 0x5b:
		bootloader = appmode - 0x26;
		break;

	default:
		dev_err(&data->client->dev,
			"Appmode i2c address 0x%02x not found\n",
			appmode);
		return -EINVAL;
	}

	data->bootloader_addr = bootloader;
	return 0;
}

static int mxt_probe_bootloader(struct mxt_data *data, bool alt_address)
{
	struct device *dev = &data->client->dev;
	int error;
	u8 val;
	bool crc_failure;

	error = mxt_lookup_bootloader_address(data, alt_address);
	if (error)
		return error;

	error = mxt_bootloader_read(data, &val, 1);
	if (error)
		return error;

	/* Check app crc fail mode */
	crc_failure = (val & ~MXT_BOOT_STATUS_MASK) == MXT_APP_CRC_FAIL;

	dev_err(dev, "Detected bootloader, status:%02X%s\n",
			val, crc_failure ? ", APP_CRC_FAIL" : "");

	return 0;
}

static u8 mxt_get_bootloader_version(struct mxt_data *data, u8 val)
{
	struct device *dev = &data->client->dev;
	u8 buf[3];

	if (val & MXT_BOOT_EXTENDED_ID) {
		if (mxt_bootloader_read(data, &buf[0], 3) != 0) {
			dev_err(dev, "%s: i2c failure\n", __func__);
			return val;
		}

		dev_dbg(dev, "Bootloader ID:%d Version:%d\n", buf[1], buf[2]);

		return buf[0];
	} else {
		dev_dbg(dev, "Bootloader ID:%d\n", val & MXT_BOOT_ID_MASK);

		return val;
	}
}

static int mxt_check_bootloader(struct mxt_data *data, unsigned int state,
				bool wait)
{
	struct device *dev = &data->client->dev;
	u8 val;
	int ret;

recheck:
	if (wait) {
		/*
		 * In application update mode, the interrupt
		 * line signals state transitions. We must wait for the
		 * CHG assertion before reading the status byte.
		 * Once the status byte has been read, the line is deasserted.
		 */
		ret = mxt_wait_for_completion(data, &data->bl_completion,
					      MXT_FW_CHG_TIMEOUT);
		if (ret) {
			/*
			 * TODO: handle -ERESTARTSYS better by terminating
			 * fw update process before returning to userspace
			 * by writing length 0x000 to device (iff we are in
			 * WAITING_FRAME_DATA state).
			 */
			dev_err(dev, "Update wait error %d\n", ret);
			return ret;
		}
	}

	ret = mxt_bootloader_read(data, &val, 1);
	if (ret)
		return ret;

	if (state == MXT_WAITING_BOOTLOAD_CMD)
		val = mxt_get_bootloader_version(data, val);

	switch (state) {
	case MXT_WAITING_BOOTLOAD_CMD:
	case MXT_WAITING_FRAME_DATA:
	case MXT_APP_CRC_FAIL:
		val &= ~MXT_BOOT_STATUS_MASK;
		break;
	case MXT_FRAME_CRC_PASS:
		if (val == MXT_FRAME_CRC_CHECK) {
			goto recheck;
		} else if (val == MXT_FRAME_CRC_FAIL) {
			dev_err(dev, "Bootloader CRC fail\n");
			return -EINVAL;
		}
		break;
	default:
		return -EINVAL;
	}

	if (val != state) {
		dev_err(dev, "Invalid bootloader state %02X != %02X\n",
			val, state);
		return -EINVAL;
	}

	return 0;
}

static int mxt_send_bootloader_cmd(struct mxt_data *data, bool unlock)
{
	int ret;
	u8 buf[2];

	if (unlock) {
		buf[0] = MXT_UNLOCK_CMD_LSB;
		buf[1] = MXT_UNLOCK_CMD_MSB;
	} else {
		buf[0] = 0x01;
		buf[1] = 0x01;
	}

	ret = mxt_bootloader_write(data, buf, 2);
	if (ret)
		return ret;

	return 0;
}

static int __mxt_read_reg(struct i2c_client *client,
			       u16 reg, u16 len, void *val)
{
	struct i2c_msg xfer[2];
	u8 buf[2];
	int ret;

	buf[0] = reg & 0xff;
	buf[1] = (reg >> 8) & 0xff;

	/* Write register */
	xfer[0].addr = client->addr;
	xfer[0].flags = 0;
	xfer[0].len = 2;
	xfer[0].buf = buf;

	/* Read data */
	xfer[1].addr = client->addr;
	xfer[1].flags = I2C_M_RD;
	xfer[1].len = len;
	xfer[1].buf = val;

	ret = i2c_transfer(client->adapter, xfer, 2);
	if (ret == 2) {
		ret = 0;
	} else {
		if (ret >= 0)
			ret = -EIO;
		dev_err(&client->dev, "%s: i2c transfer failed (%d)\n",
			__func__, ret);
	}

	return ret;
}

static int __mxt_write_reg(struct i2c_client *client, u16 reg, u16 len,
			   const void *val)
{
	u8 *buf;
	size_t count;
	int ret;

	count = len + 2;
	buf = kmalloc(count, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	buf[0] = reg & 0xff;
	buf[1] = (reg >> 8) & 0xff;
	memcpy(&buf[2], val, len);

	ret = i2c_master_send(client, buf, count);
	if (ret == count) {
		ret = 0;
	} else {
		if (ret >= 0)
			ret = -EIO;
		dev_err(&client->dev, "%s: i2c send failed (%d)\n",
			__func__, ret);
	}

	kfree(buf);
	return ret;
}

static int mxt_write_reg(struct i2c_client *client, u16 reg, u8 val)
{
	return __mxt_write_reg(client, reg, 1, &val);
}

static struct mxt_object *
mxt_get_object(struct mxt_data *data, u8 type)
{
	struct mxt_object *object;
	int i;

	for (i = 0; i < data->info.object_num; i++) {
		object = data->object_table + i;
		if (object->type == type)
			return object;
	}

	dev_warn(&data->client->dev, "Invalid object type T%u\n", type);
	return NULL;
}

static void mxt_proc_t6_messages(struct mxt_data *data, u8 *msg)
{
	struct device *dev = &data->client->dev;
	u8 status = msg[1];
	u32 crc = msg[2] | (msg[3] << 8) | (msg[4] << 16);

	complete(&data->crc_completion);

	if (crc != data->config_crc) {
		data->config_crc = crc;
		dev_dbg(dev, "T6 Config Checksum: 0x%06X\n", crc);
	}

	/* Detect reset */
	if (status & MXT_T6_STATUS_RESET)
		complete(&data->reset_completion);

	/* Output debug if status has changed */
	if (status != data->t6_status)
		dev_dbg(dev, "T6 Status 0x%02X%s%s%s%s%s%s%s\n",
			status,
			status == 0 ? " OK" : "",
			status & MXT_T6_STATUS_RESET ? " RESET" : "",
			status & MXT_T6_STATUS_OFL ? " OFL" : "",
			status & MXT_T6_STATUS_SIGERR ? " SIGERR" : "",
			status & MXT_T6_STATUS_CAL ? " CAL" : "",
			status & MXT_T6_STATUS_CFGERR ? " CFGERR" : "",
			status & MXT_T6_STATUS_COMSERR ? " COMSERR" : "");

	/* Save current status */
	data->t6_status = status;
}

static int mxt_write_object(struct mxt_data *data,
				 u8 type, u8 offset, u8 val)
{
	struct mxt_object *object;
	u16 reg;

	object = mxt_get_object(data, type);
	if (!object || offset >= mxt_obj_size(object))
		return -EINVAL;

	reg = object->start_address;
	return mxt_write_reg(data->client, reg + offset, val);
}

static void mxt_input_button(struct mxt_data *data, u8 *message)
{
	struct input_dev *input = data->input_dev;
	const struct mxt_platform_data *pdata = data->pdata;
	int i;

	for (i = 0; i < pdata->t19_num_keys; i++) {
		if (pdata->t19_keymap[i] == KEY_RESERVED)
			continue;

		/* Active-low switch */
		input_report_key(input, pdata->t19_keymap[i],
				 !(message[1] & BIT(i)));
	}
}

static void mxt_input_sync(struct mxt_data *data)
{
	input_mt_report_pointer_emulation(data->input_dev,
					  data->pdata->t19_num_keys);
	input_sync(data->input_dev);
}

static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
{
	struct device *dev = &data->client->dev;
	struct input_dev *input_dev = data->input_dev;
	int id;
	u8 status;
	int x;
	int y;
	int area;
	int amplitude;

	id = message[0] - data->T9_reportid_min;
	status = message[1];
	x = (message[2] << 4) | ((message[4] >> 4) & 0xf);
	y = (message[3] << 4) | ((message[4] & 0xf));

	/* Handle 10/12 bit switching */
	if (data->max_x < 1024)
		x >>= 2;
	if (data->max_y < 1024)
		y >>= 2;

	area = message[5];
	amplitude = message[6];

	dev_dbg(dev,
		"[%u] %c%c%c%c%c%c%c%c x: %5u y: %5u area: %3u amp: %3u\n",
		id,
		(status & MXT_T9_DETECT) ? 'D' : '.',
		(status & MXT_T9_PRESS) ? 'P' : '.',
		(status & MXT_T9_RELEASE) ? 'R' : '.',
		(status & MXT_T9_MOVE) ? 'M' : '.',
		(status & MXT_T9_VECTOR) ? 'V' : '.',
		(status & MXT_T9_AMP) ? 'A' : '.',
		(status & MXT_T9_SUPPRESS) ? 'S' : '.',
		(status & MXT_T9_UNGRIP) ? 'U' : '.',
		x, y, area, amplitude);

	input_mt_slot(input_dev, id);

	if (status & MXT_T9_DETECT) {
		/*
		 * Multiple bits may be set if the host is slow to read
		 * the status messages, indicating all the events that
		 * have happened.
		 */
		if (status & MXT_T9_RELEASE) {
			input_mt_report_slot_state(input_dev,
						   MT_TOOL_FINGER, 0);
			mxt_input_sync(data);
		}

		/* Touch active */
		input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, 1);
		input_report_abs(input_dev, ABS_MT_POSITION_X, x);
		input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
		input_report_abs(input_dev, ABS_MT_PRESSURE, amplitude);
		input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, area);
	} else {
		/* Touch no longer active, close out slot */
		input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, 0);
	}

	data->update_input = true;
}

static void mxt_proc_t100_message(struct mxt_data *data, u8 *message)
{
	struct device *dev = &data->client->dev;
	struct input_dev *input_dev = data->input_dev;
	int id;
	u8 status;
	u8 type = 0;
	u16 x;
	u16 y;
	int distance = 0;
	int tool = 0;
	u8 major = 0;
	u8 pressure = 0;
	u8 orientation = 0;

	id = message[0] - data->T100_reportid_min - 2;

	/* ignore SCRSTATUS events */
	if (id < 0)
		return;

	status = message[1];
	x = get_unaligned_le16(&message[2]);
	y = get_unaligned_le16(&message[4]);

	if (status & MXT_T100_DETECT) {
		type = (status & MXT_T100_TYPE_MASK) >> 4;

		switch (type) {
		case MXT_T100_TYPE_HOVERING_FINGER:
			tool = MT_TOOL_FINGER;
			distance = MXT_DISTANCE_HOVERING;

			if (data->t100_aux_vect)
				orientation = message[data->t100_aux_vect];

			break;

		case MXT_T100_TYPE_FINGER:
		case MXT_T100_TYPE_GLOVE:
			tool = MT_TOOL_FINGER;
			distance = MXT_DISTANCE_ACTIVE_TOUCH;

			if (data->t100_aux_area)
				major = message[data->t100_aux_area];

			if (data->t100_aux_ampl)
				pressure = message[data->t100_aux_ampl];

			if (data->t100_aux_vect)
				orientation = message[data->t100_aux_vect];

			break;

		case MXT_T100_TYPE_PASSIVE_STYLUS:
			tool = MT_TOOL_PEN;

			/*
			 * Passive stylus is reported with size zero so
			 * hardcode.
			 */
			major = MXT_TOUCH_MAJOR_DEFAULT;

			if (data->t100_aux_ampl)
				pressure = message[data->t100_aux_ampl];

			break;

		case MXT_T100_TYPE_LARGE_TOUCH:
			/* Ignore suppressed touch */
			break;

		default:
			dev_dbg(dev, "Unexpected T100 type\n");
			return;
		}
	}

	/*
	 * Values reported should be non-zero if tool is touching the
	 * device
	 */
	if (!pressure && type != MXT_T100_TYPE_HOVERING_FINGER)
		pressure = MXT_PRESSURE_DEFAULT;

	input_mt_slot(input_dev, id);

	if (status & MXT_T100_DETECT) {
		dev_dbg(dev, "[%u] type:%u x:%u y:%u a:%02X p:%02X v:%02X\n",
			id, type, x, y, major, pressure, orientation);

		input_mt_report_slot_state(input_dev, tool, 1);
		input_report_abs(input_dev, ABS_MT_POSITION_X, x);
		input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
		input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, major);
		input_report_abs(input_dev, ABS_MT_PRESSURE, pressure);
		input_report_abs(input_dev, ABS_MT_DISTANCE, distance);
		input_report_abs(input_dev, ABS_MT_ORIENTATION, orientation);
	} else {
		dev_dbg(dev, "[%u] release\n", id);

		/* close out slot */
		input_mt_report_slot_state(input_dev, 0, 0);
	}

	data->update_input = true;
}

static int mxt_proc_message(struct mxt_data *data, u8 *message)
{
	u8 report_id = message[0];

	if (report_id == MXT_RPTID_NOMSG)
		return 0;

	if (report_id == data->T6_reportid) {
		mxt_proc_t6_messages(data, message);
	} else if (!data->input_dev) {
		/*
		 * Do not report events if input device
		 * is not yet registered.
		 */
		mxt_dump_message(data, message);
	} else if (report_id >= data->T9_reportid_min &&
		   report_id <= data->T9_reportid_max) {
		mxt_proc_t9_message(data, message);
	} else if (report_id >= data->T100_reportid_min &&
		   report_id <= data->T100_reportid_max) {
		mxt_proc_t100_message(data, message);
	} else if (report_id == data->T19_reportid) {
		mxt_input_button(data, message);
		data->update_input = true;
	} else {
		mxt_dump_message(data, message);
	}

	return 1;
}

static int mxt_read_and_process_messages(struct mxt_data *data, u8 count)
{
	struct device *dev = &data->client->dev;
	int ret;
	int i;
	u8 num_valid = 0;

	/* Safety check for msg_buf */
	if (count > data->max_reportid)
		return -EINVAL;

	/* Process remaining messages if necessary */
	ret = __mxt_read_reg(data->client, data->T5_address,
				data->T5_msg_size * count, data->msg_buf);
	if (ret) {
		dev_err(dev, "Failed to read %u messages (%d)\n", count, ret);
		return ret;
	}

	for (i = 0;  i < count; i++) {
		ret = mxt_proc_message(data,
			data->msg_buf + data->T5_msg_size * i);

		if (ret == 1)
			num_valid++;
	}

	/* return number of messages read */
	return num_valid;
}

static irqreturn_t mxt_process_messages_t44(struct mxt_data *data)
{
	struct device *dev = &data->client->dev;
	int ret;
	u8 count, num_left;

	/* Read T44 and T5 together */
	ret = __mxt_read_reg(data->client, data->T44_address,
		data->T5_msg_size + 1, data->msg_buf);
	if (ret) {
		dev_err(dev, "Failed to read T44 and T5 (%d)\n", ret);
		return IRQ_NONE;
	}

	count = data->msg_buf[0];

	/*
	 * This condition may be caused by the CHG line being configured in
	 * Mode 0. It results in unnecessary I2C operations but it is benign.
	 */
	if (count == 0)
		return IRQ_NONE;

	if (count > data->max_reportid) {
		dev_warn(dev, "T44 count %d exceeded max report id\n", count);
		count = data->max_reportid;
	}

	/* Process first message */
	ret = mxt_proc_message(data, data->msg_buf + 1);
	if (ret < 0) {
		dev_warn(dev, "Unexpected invalid message\n");
		return IRQ_NONE;
	}

	num_left = count - 1;

	/* Process remaining messages if necessary */
	if (num_left) {
		ret = mxt_read_and_process_messages(data, num_left);
		if (ret < 0)
			goto end;
		else if (ret != num_left)
			dev_warn(dev, "Unexpected invalid message\n");
	}

end:
	if (data->update_input) {
		mxt_input_sync(data);
		data->update_input = false;
	}

	return IRQ_HANDLED;
}

static int mxt_process_messages_until_invalid(struct mxt_data *data)
{
	struct device *dev = &data->client->dev;
	int count, read;
	u8 tries = 2;

	count = data->max_reportid;

	/* Read messages until we force an invalid */
	do {
		read = mxt_read_and_process_messages(data, count);
		if (read < count)
			return 0;
	} while (--tries);

	if (data->update_input) {
		mxt_input_sync(data);
		data->update_input = false;
	}

	dev_err(dev, "CHG pin isn't cleared\n");
	return -EBUSY;
}

static irqreturn_t mxt_process_messages(struct mxt_data *data)
{
	int total_handled, num_handled;
	u8 count = data->last_message_count;

	if (count < 1 || count > data->max_reportid)
		count = 1;

	/* include final invalid message */
	total_handled = mxt_read_and_process_messages(data, count + 1);
	if (total_handled < 0)
		return IRQ_NONE;
	/* if there were invalid messages, then we are done */
	else if (total_handled <= count)
		goto update_count;

	/* keep reading two msgs until one is invalid or reportid limit */
	do {
		num_handled = mxt_read_and_process_messages(data, 2);
		if (num_handled < 0)
			return IRQ_NONE;

		total_handled += num_handled;

		if (num_handled < 2)
			break;
	} while (total_handled < data->num_touchids);

update_count:
	data->last_message_count = total_handled;

	if (data->update_input) {
		mxt_input_sync(data);
		data->update_input = false;
	}

	return IRQ_HANDLED;
}

static irqreturn_t mxt_interrupt(int irq, void *dev_id)
{
	struct mxt_data *data = dev_id;

	if (data->in_bootloader) {
		/* bootloader state transition completion */
		complete(&data->bl_completion);
		return IRQ_HANDLED;
	}

	if (!data->object_table)
		return IRQ_HANDLED;

	if (data->T44_address) {
		return mxt_process_messages_t44(data);
	} else {
		return mxt_process_messages(data);
	}
}

static int mxt_t6_command(struct mxt_data *data, u16 cmd_offset,
			  u8 value, bool wait)
{
	u16 reg;
	u8 command_register;
	int timeout_counter = 0;
	int ret;

	reg = data->T6_address + cmd_offset;

	ret = mxt_write_reg(data->client, reg, value);
	if (ret)
		return ret;

	if (!wait)
		return 0;

	do {
		msleep(20);
		ret = __mxt_read_reg(data->client, reg, 1, &command_register);
		if (ret)
			return ret;
	} while (command_register != 0 && timeout_counter++ <= 100);

	if (timeout_counter > 100) {
		dev_err(&data->client->dev, "Command failed!\n");
		return -EIO;
	}

	return 0;
}

static int mxt_soft_reset(struct mxt_data *data)
{
	struct device *dev = &data->client->dev;
	int ret = 0;

	dev_info(dev, "Resetting device\n");

	disable_irq(data->irq);

	reinit_completion(&data->reset_completion);

	ret = mxt_t6_command(data, MXT_COMMAND_RESET, MXT_RESET_VALUE, false);
	if (ret)
		return ret;

	/* Ignore CHG line for 100ms after reset */
	msleep(100);

	enable_irq(data->irq);

	ret = mxt_wait_for_completion(data, &data->reset_completion,
				      MXT_RESET_TIMEOUT);
	if (ret)
		return ret;

	return 0;
}

static void mxt_update_crc(struct mxt_data *data, u8 cmd, u8 value)
{
	/*
	 * On failure, CRC is set to 0 and config will always be
	 * downloaded.
	 */
	data->config_crc = 0;
	reinit_completion(&data->crc_completion);

	mxt_t6_command(data, cmd, value, true);

	/*
	 * Wait for crc message. On failure, CRC is set to 0 and config will
	 * always be downloaded.
	 */
	mxt_wait_for_completion(data, &data->crc_completion, MXT_CRC_TIMEOUT);
}

static void mxt_calc_crc24(u32 *crc, u8 firstbyte, u8 secondbyte)
{
	static const unsigned int crcpoly = 0x80001B;
	u32 result;
	u32 data_word;

	data_word = (secondbyte << 8) | firstbyte;
	result = ((*crc << 1) ^ data_word);

	if (result & 0x1000000)
		result ^= crcpoly;

	*crc = result;
}

static u32 mxt_calculate_crc(u8 *base, off_t start_off, off_t end_off)
{
	u32 crc = 0;
	u8 *ptr = base + start_off;
	u8 *last_val = base + end_off - 1;

	if (end_off < start_off)
		return -EINVAL;

	while (ptr < last_val) {
		mxt_calc_crc24(&crc, *ptr, *(ptr + 1));
		ptr += 2;
	}

	/* if len is odd, fill the last byte with 0 */
	if (ptr == last_val)
		mxt_calc_crc24(&crc, *ptr, 0);

	/* Mask to 24-bit */
	crc &= 0x00FFFFFF;

	return crc;
}

static int mxt_prepare_cfg_mem(struct mxt_data *data,
			       const struct firmware *cfg,
			       unsigned int data_pos,
			       unsigned int cfg_start_ofs,
			       u8 *config_mem,
			       size_t config_mem_size)
{
	struct device *dev = &data->client->dev;
	struct mxt_object *object;
	unsigned int type, instance, size, byte_offset;
	int offset;
	int ret;
	int i;
	u16 reg;
	u8 val;

	while (data_pos < cfg->size) {
		/* Read type, instance, length */
		ret = sscanf(cfg->data + data_pos, "%x %x %x%n",
			     &type, &instance, &size, &offset);
		if (ret == 0) {
			/* EOF */
			break;
		} else if (ret != 3) {
			dev_err(dev, "Bad format: failed to parse object\n");
			return -EINVAL;
		}
		data_pos += offset;

		object = mxt_get_object(data, type);
		if (!object) {
			/* Skip object */
			for (i = 0; i < size; i++) {
				ret = sscanf(cfg->data + data_pos, "%hhx%n",
					     &val, &offset);
				if (ret != 1) {
					dev_err(dev, "Bad format in T%d at %d\n",
						type, i);
					return -EINVAL;
				}
				data_pos += offset;
			}
			continue;
		}

		if (size > mxt_obj_size(object)) {
			/*
			 * Either we are in fallback mode due to wrong
			 * config or config from a later fw version,
			 * or the file is corrupt or hand-edited.
			 */
			dev_warn(dev, "Discarding %zu byte(s) in T%u\n",
				 size - mxt_obj_size(object), type);
		} else if (mxt_obj_size(object) > size) {
			/*
			 * If firmware is upgraded, new bytes may be added to
			 * end of objects. It is generally forward compatible
			 * to zero these bytes - previous behaviour will be
			 * retained. However this does invalidate the CRC and
			 * will force fallback mode until the configuration is
			 * updated. We warn here but do nothing else - the
			 * malloc has zeroed the entire configuration.
			 */
			dev_warn(dev, "Zeroing %zu byte(s) in T%d\n",
				 mxt_obj_size(object) - size, type);
		}

		if (instance >= mxt_obj_instances(object)) {
			dev_err(dev, "Object instances exceeded!\n");
			return -EINVAL;
		}

		reg = object->start_address + mxt_obj_size(object) * instance;

		for (i = 0; i < size; i++) {
			ret = sscanf(cfg->data + data_pos, "%hhx%n",
				     &val,
				     &offset);
			if (ret != 1) {
				dev_err(dev, "Bad format in T%d at %d\n",
					type, i);
				return -EINVAL;
			}
			data_pos += offset;

			if (i > mxt_obj_size(object))
				continue;

			byte_offset = reg + i - cfg_start_ofs;

			if (byte_offset >= 0 && byte_offset < config_mem_size) {
				*(config_mem + byte_offset) = val;
			} else {
				dev_err(dev, "Bad object: reg:%d, T%d, ofs=%d\n",
					reg, object->type, byte_offset);
				return -EINVAL;
			}
		}
	}

	return 0;
}

static int mxt_upload_cfg_mem(struct mxt_data *data, unsigned int cfg_start,
			      u8 *config_mem, size_t config_mem_size)
{
	unsigned int byte_offset = 0;
	int error;

	/* Write configuration as blocks */
	while (byte_offset < config_mem_size) {
		unsigned int size = config_mem_size - byte_offset;

		if (size > MXT_MAX_BLOCK_WRITE)
			size = MXT_MAX_BLOCK_WRITE;

		error = __mxt_write_reg(data->client,
					cfg_start + byte_offset,
					size, config_mem + byte_offset);
		if (error) {
			dev_err(&data->client->dev,
				"Config write error, ret=%d\n", error);
			return error;
		}

		byte_offset += size;
	}

	return 0;
}

static int mxt_init_t7_power_cfg(struct mxt_data *data);

/*
 * mxt_update_cfg - download configuration to chip
 *
 * Atmel Raw Config File Format
 *
 * The first four lines of the raw config file contain:
 *  1) Version
 *  2) Chip ID Information (first 7 bytes of device memory)
 *  3) Chip Information Block 24-bit CRC Checksum
 *  4) Chip Configuration 24-bit CRC Checksum
 *
 * The rest of the file consists of one line per object instance:
 *   <TYPE> <INSTANCE> <SIZE> <CONTENTS>
 *
 *   <TYPE> - 2-byte object type as hex
 *   <INSTANCE> - 2-byte object instance number as hex
 *   <SIZE> - 2-byte object size as hex
 *   <CONTENTS> - array of <SIZE> 1-byte hex values
 */
static int mxt_update_cfg(struct mxt_data *data, const struct firmware *cfg)
{
	struct device *dev = &data->client->dev;
	struct mxt_info cfg_info;
	int ret;
	int offset;
	int data_pos;
	int i;
	int cfg_start_ofs;
	u32 info_crc, config_crc, calculated_crc;
	u8 *config_mem;
	size_t config_mem_size;

	mxt_update_crc(data, MXT_COMMAND_REPORTALL, 1);

	if (strncmp(cfg->data, MXT_CFG_MAGIC, strlen(MXT_CFG_MAGIC))) {
		dev_err(dev, "Unrecognised config file\n");
		return -EINVAL;
	}

	data_pos = strlen(MXT_CFG_MAGIC);

	/* Load information block and check */
	for (i = 0; i < sizeof(struct mxt_info); i++) {
		ret = sscanf(cfg->data + data_pos, "%hhx%n",
			     (unsigned char *)&cfg_info + i,
			     &offset);
		if (ret != 1) {
			dev_err(dev, "Bad format\n");
			return -EINVAL;
		}

		data_pos += offset;
	}

	if (cfg_info.family_id != data->info.family_id) {
		dev_err(dev, "Family ID mismatch!\n");
		return -EINVAL;
	}

	if (cfg_info.variant_id != data->info.variant_id) {
		dev_err(dev, "Variant ID mismatch!\n");
		return -EINVAL;
	}

	/* Read CRCs */
	ret = sscanf(cfg->data + data_pos, "%x%n", &info_crc, &offset);
	if (ret != 1) {
		dev_err(dev, "Bad format: failed to parse Info CRC\n");
		return -EINVAL;
	}
	data_pos += offset;

	ret = sscanf(cfg->data + data_pos, "%x%n", &config_crc, &offset);
	if (ret != 1) {
		dev_err(dev, "Bad format: failed to parse Config CRC\n");
		return -EINVAL;
	}
	data_pos += offset;

	/*
	 * The Info Block CRC is calculated over mxt_info and the object
	 * table. If it does not match then we are trying to load the
	 * configuration from a different chip or firmware version, so
	 * the configuration CRC is invalid anyway.
	 */
	if (info_crc == data->info_crc) {
		if (config_crc == 0 || data->config_crc == 0) {
			dev_info(dev, "CRC zero, attempting to apply config\n");
		} else if (config_crc == data->config_crc) {
			dev_dbg(dev, "Config CRC 0x%06X: OK\n",
				 data->config_crc);
			return 0;
		} else {
			dev_info(dev, "Config CRC 0x%06X: does not match file 0x%06X\n",
				 data->config_crc, config_crc);
		}
	} else {
		dev_warn(dev,
			 "Warning: Info CRC error - device=0x%06X file=0x%06X\n",
			 data->info_crc, info_crc);
	}

	/* Malloc memory to store configuration */
	cfg_start_ofs = MXT_OBJECT_START +
			data->info.object_num * sizeof(struct mxt_object) +
			MXT_INFO_CHECKSUM_SIZE;
	config_mem_size = data->mem_size - cfg_start_ofs;
	config_mem = kzalloc(config_mem_size, GFP_KERNEL);
	if (!config_mem) {
		dev_err(dev, "Failed to allocate memory\n");
		return -ENOMEM;
	}

	ret = mxt_prepare_cfg_mem(data, cfg, data_pos, cfg_start_ofs,
				  config_mem, config_mem_size);
	if (ret)
		goto release_mem;

	/* Calculate crc of the received configs (not the raw config file) */
	if (data->T7_address < cfg_start_ofs) {
		dev_err(dev, "Bad T7 address, T7addr = %x, config offset %x\n",
			data->T7_address, cfg_start_ofs);
		ret = 0;
		goto release_mem;
	}

	calculated_crc = mxt_calculate_crc(config_mem,
					   data->T7_address - cfg_start_ofs,
					   config_mem_size);

	if (config_crc > 0 && config_crc != calculated_crc)
		dev_warn(dev, "Config CRC error, calculated=%06X, file=%06X\n",
			 calculated_crc, config_crc);

	ret = mxt_upload_cfg_mem(data, cfg_start_ofs,
				 config_mem, config_mem_size);
	if (ret)
		goto release_mem;

	mxt_update_crc(data, MXT_COMMAND_BACKUPNV, MXT_BACKUP_VALUE);

	ret = mxt_soft_reset(data);
	if (ret)
		goto release_mem;

	dev_info(dev, "Config successfully updated\n");

	/* T7 config may have changed */
	mxt_init_t7_power_cfg(data);

release_mem:
	kfree(config_mem);
	return ret;
}

static int mxt_acquire_irq(struct mxt_data *data)
{
	int error;

	enable_irq(data->irq);

	error = mxt_process_messages_until_invalid(data);
	if (error)
		return error;

	return 0;
}

static int mxt_get_info(struct mxt_data *data)
{
	struct i2c_client *client = data->client;
	struct mxt_info *info = &data->info;
	int error;

	/* Read 7-byte info block starting at address 0 */
	error = __mxt_read_reg(client, 0, sizeof(*info), info);
	if (error)
		return error;

	return 0;
}

static void mxt_free_input_device(struct mxt_data *data)
{
	if (data->input_dev) {
		input_unregister_device(data->input_dev);
		data->input_dev = NULL;
	}
}

static void mxt_free_object_table(struct mxt_data *data)
{
	kfree(data->object_table);
	data->object_table = NULL;
	kfree(data->msg_buf);
	data->msg_buf = NULL;
	data->T5_address = 0;
	data->T5_msg_size = 0;
	data->T6_reportid = 0;
	data->T7_address = 0;
	data->T9_reportid_min = 0;
	data->T9_reportid_max = 0;
	data->T19_reportid = 0;
	data->T44_address = 0;
	data->T100_reportid_min = 0;
	data->T100_reportid_max = 0;
	data->max_reportid = 0;
}

static int mxt_get_object_table(struct mxt_data *data)
{
	struct i2c_client *client = data->client;
	size_t table_size;
	struct mxt_object *object_table;
	int error;
	int i;
	u8 reportid;
	u16 end_address;

	table_size = data->info.object_num * sizeof(struct mxt_object);
	object_table = kzalloc(table_size, GFP_KERNEL);
	if (!object_table) {
		dev_err(&data->client->dev, "Failed to allocate memory\n");
		return -ENOMEM;
	}

	error = __mxt_read_reg(client, MXT_OBJECT_START, table_size,
			object_table);
	if (error) {
		kfree(object_table);
		return error;
	}

	/* Valid Report IDs start counting from 1 */
	reportid = 1;
	data->mem_size = 0;
	for (i = 0; i < data->info.object_num; i++) {
		struct mxt_object *object = object_table + i;
		u8 min_id, max_id;

		le16_to_cpus(&object->start_address);

		if (object->num_report_ids) {
			min_id = reportid;
			reportid += object->num_report_ids *
					mxt_obj_instances(object);
			max_id = reportid - 1;
		} else {
			min_id = 0;
			max_id = 0;
		}

		dev_dbg(&data->client->dev,
			"T%u Start:%u Size:%zu Instances:%zu Report IDs:%u-%u\n",
			object->type, object->start_address,
			mxt_obj_size(object), mxt_obj_instances(object),
			min_id, max_id);

		switch (object->type) {
		case MXT_GEN_MESSAGE_T5:
			if (data->info.family_id == 0x80 &&
			    data->info.version < 0x20) {
				/*
				 * On mXT224 firmware versions prior to V2.0
				 * read and discard unused CRC byte otherwise
				 * DMA reads are misaligned.
				 */
				data->T5_msg_size = mxt_obj_size(object);
			} else {
				/* CRC not enabled, so skip last byte */
				data->T5_msg_size = mxt_obj_size(object) - 1;
			}
			data->T5_address = object->start_address;
			break;
		case MXT_GEN_COMMAND_T6:
			data->T6_reportid = min_id;
			data->T6_address = object->start_address;
			break;
		case MXT_GEN_POWER_T7:
			data->T7_address = object->start_address;
			break;
		case MXT_TOUCH_MULTI_T9:
			data->multitouch = MXT_TOUCH_MULTI_T9;
			data->T9_reportid_min = min_id;
			data->T9_reportid_max = max_id;
			data->num_touchids = object->num_report_ids
						* mxt_obj_instances(object);
			break;
		case MXT_SPT_MESSAGECOUNT_T44:
			data->T44_address = object->start_address;
			break;
		case MXT_SPT_GPIOPWM_T19:
			data->T19_reportid = min_id;
			break;
		case MXT_TOUCH_MULTITOUCHSCREEN_T100:
			data->multitouch = MXT_TOUCH_MULTITOUCHSCREEN_T100;
			data->T100_reportid_min = min_id;
			data->T100_reportid_max = max_id;
			/* first two report IDs reserved */
			data->num_touchids = object->num_report_ids - 2;
			break;
		}

		end_address = object->start_address
			+ mxt_obj_size(object) * mxt_obj_instances(object) - 1;

		if (end_address >= data->mem_size)
			data->mem_size = end_address + 1;
	}

	/* Store maximum reportid */
	data->max_reportid = reportid;

	/* If T44 exists, T5 position has to be directly after */
	if (data->T44_address && (data->T5_address != data->T44_address + 1)) {
		dev_err(&client->dev, "Invalid T44 position\n");
		error = -EINVAL;
		goto free_object_table;
	}

	data->msg_buf = kcalloc(data->max_reportid,
				data->T5_msg_size, GFP_KERNEL);
	if (!data->msg_buf) {
		dev_err(&client->dev, "Failed to allocate message buffer\n");
		error = -ENOMEM;
		goto free_object_table;
	}

	data->object_table = object_table;

	return 0;

free_object_table:
	mxt_free_object_table(data);
	return error;
}

static int mxt_read_t9_resolution(struct mxt_data *data)
{
	struct i2c_client *client = data->client;
	int error;
	struct t9_range range;
	unsigned char orient;
	struct mxt_object *object;

	object = mxt_get_object(data, MXT_TOUCH_MULTI_T9);
	if (!object)
		return -EINVAL;

	error = __mxt_read_reg(client,
			       object->start_address + MXT_T9_RANGE,
			       sizeof(range), &range);
	if (error)
		return error;

	le16_to_cpus(&range.x);
	le16_to_cpus(&range.y);

	error =  __mxt_read_reg(client,
				object->start_address + MXT_T9_ORIENT,
				1, &orient);
	if (error)
		return error;

	/* Handle default values */
	if (range.x == 0)
		range.x = 1023;

	if (range.y == 0)
		range.y = 1023;

	if (orient & MXT_T9_ORIENT_SWITCH) {
		data->max_x = range.y;
		data->max_y = range.x;
	} else {
		data->max_x = range.x;
		data->max_y = range.y;
	}

	dev_dbg(&client->dev,
		"Touchscreen size X%uY%u\n", data->max_x, data->max_y);

	return 0;
}

static int mxt_read_t100_config(struct mxt_data *data)
{
	struct i2c_client *client = data->client;
	int error;
	struct mxt_object *object;
	u16 range_x, range_y;
	u8 cfg, tchaux;
	u8 aux;

	object = mxt_get_object(data, MXT_TOUCH_MULTITOUCHSCREEN_T100);
	if (!object)
		return -EINVAL;

	error = __mxt_read_reg(client,
			       object->start_address + MXT_T100_XRANGE,
			       sizeof(range_x), &range_x);
	if (error)
		return error;

	le16_to_cpus(&range_x);

	error = __mxt_read_reg(client,
			       object->start_address + MXT_T100_YRANGE,
			       sizeof(range_y), &range_y);
	if (error)
		return error;

	le16_to_cpus(&range_y);

	error =  __mxt_read_reg(client,
				object->start_address + MXT_T100_CFG1,
				1, &cfg);
	if (error)
		return error;

	error =  __mxt_read_reg(client,
				object->start_address + MXT_T100_TCHAUX,
				1, &tchaux);
	if (error)
		return error;

	/* Handle default values */
	if (range_x == 0)
		range_x = 1023;

	if (range_y == 0)
		range_y = 1023;

	if (cfg & MXT_T100_CFG_SWITCHXY) {
		data->max_x = range_y;
		data->max_y = range_x;
	} else {
		data->max_x = range_x;
		data->max_y = range_y;
	}

	/* allocate aux bytes */
	aux = 6;

	if (tchaux & MXT_T100_TCHAUX_VECT)
		data->t100_aux_vect = aux++;

	if (tchaux & MXT_T100_TCHAUX_AMPL)
		data->t100_aux_ampl = aux++;

	if (tchaux & MXT_T100_TCHAUX_AREA)
		data->t100_aux_area = aux++;

	dev_dbg(&client->dev,
		"T100 aux mappings vect:%u ampl:%u area:%u\n",
		data->t100_aux_vect, data->t100_aux_ampl, data->t100_aux_area);

	dev_info(&client->dev,
		 "T100 Touchscreen size X%uY%u\n", data->max_x, data->max_y);

	return 0;
}

static int mxt_input_open(struct input_dev *dev);
static void mxt_input_close(struct input_dev *dev);

static void mxt_set_up_as_touchpad(struct input_dev *input_dev,
				   struct mxt_data *data)
{
	const struct mxt_platform_data *pdata = data->pdata;
	int i;

	input_dev->name = "Atmel maXTouch Touchpad";

	__set_bit(INPUT_PROP_BUTTONPAD, input_dev->propbit);

	input_abs_set_res(input_dev, ABS_X, MXT_PIXELS_PER_MM);
	input_abs_set_res(input_dev, ABS_Y, MXT_PIXELS_PER_MM);
	input_abs_set_res(input_dev, ABS_MT_POSITION_X,
			  MXT_PIXELS_PER_MM);
	input_abs_set_res(input_dev, ABS_MT_POSITION_Y,
			  MXT_PIXELS_PER_MM);

	for (i = 0; i < pdata->t19_num_keys; i++)
		if (pdata->t19_keymap[i] != KEY_RESERVED)
			input_set_capability(input_dev, EV_KEY,
					     pdata->t19_keymap[i]);
}

static int mxt_initialize_input_device(struct mxt_data *data)
{
	const struct mxt_platform_data *pdata = data->pdata;
	struct device *dev = &data->client->dev;
	struct input_dev *input_dev;
	int error;
	unsigned int num_mt_slots;
	unsigned int mt_flags = 0;

	switch (data->multitouch) {
	case MXT_TOUCH_MULTI_T9:
		num_mt_slots = data->T9_reportid_max - data->T9_reportid_min + 1;
		error = mxt_read_t9_resolution(data);
		if (error)
			dev_warn(dev, "Failed to initialize T9 resolution\n");
		break;

	case MXT_TOUCH_MULTITOUCHSCREEN_T100:
		num_mt_slots = data->num_touchids;
		error = mxt_read_t100_config(data);
		if (error)
			dev_warn(dev, "Failed to read T100 config\n");
		break;

	default:
		dev_err(dev, "Invalid multitouch object\n");
		return -EINVAL;
	}

	input_dev = input_allocate_device();
	if (!input_dev) {
		dev_err(dev, "Failed to allocate memory\n");
		return -ENOMEM;
	}

	input_dev->name = "Atmel maXTouch Touchscreen";
	input_dev->phys = data->phys;
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = dev;
	input_dev->open = mxt_input_open;
	input_dev->close = mxt_input_close;

	input_set_capability(input_dev, EV_KEY, BTN_TOUCH);

	/* For single touch */
	input_set_abs_params(input_dev, ABS_X, 0, data->max_x, 0, 0);
	input_set_abs_params(input_dev, ABS_Y, 0, data->max_y, 0, 0);

	if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
	    (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
	     data->t100_aux_ampl)) {
		input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0);
	}

	/* If device has buttons we assume it is a touchpad */
	if (pdata->t19_num_keys) {
		mxt_set_up_as_touchpad(input_dev, data);
		mt_flags |= INPUT_MT_POINTER;
	} else {
		mt_flags |= INPUT_MT_DIRECT;
	}

	/* For multi touch */
	error = input_mt_init_slots(input_dev, num_mt_slots, mt_flags);
	if (error) {
		dev_err(dev, "Error %d initialising slots\n", error);
		goto err_free_mem;
	}

	if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100) {
		input_set_abs_params(input_dev, ABS_MT_TOOL_TYPE,
				     0, MT_TOOL_MAX, 0, 0);
		input_set_abs_params(input_dev, ABS_MT_DISTANCE,
				     MXT_DISTANCE_ACTIVE_TOUCH,
				     MXT_DISTANCE_HOVERING,
				     0, 0);
	}

	input_set_abs_params(input_dev, ABS_MT_POSITION_X,
			     0, data->max_x, 0, 0);
	input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
			     0, data->max_y, 0, 0);

	if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
	    (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
	     data->t100_aux_area)) {
		input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
				     0, MXT_MAX_AREA, 0, 0);
	}

	if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
	    (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
	     data->t100_aux_ampl)) {
		input_set_abs_params(input_dev, ABS_MT_PRESSURE,
				     0, 255, 0, 0);
	}

	if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
	    data->t100_aux_vect) {
		input_set_abs_params(input_dev, ABS_MT_ORIENTATION,
				     0, 255, 0, 0);
	}

	if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
	    data->t100_aux_ampl) {
		input_set_abs_params(input_dev, ABS_MT_PRESSURE,
				     0, 255, 0, 0);
	}

	if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
	    data->t100_aux_vect) {
		input_set_abs_params(input_dev, ABS_MT_ORIENTATION,
				     0, 255, 0, 0);
	}

	input_set_drvdata(input_dev, data);

	error = input_register_device(input_dev);
	if (error) {
		dev_err(dev, "Error %d registering input device\n", error);
		goto err_free_mem;
	}

	data->input_dev = input_dev;

	return 0;

err_free_mem:
	input_free_device(input_dev);
	return error;
}

static int mxt_configure_objects(struct mxt_data *data,
				 const struct firmware *cfg);

static void mxt_config_cb(const struct firmware *cfg, void *ctx)
{
	mxt_configure_objects(ctx, cfg);
	release_firmware(cfg);
}

static int mxt_initialize(struct mxt_data *data)
{
	struct i2c_client *client = data->client;
	int recovery_attempts = 0;
	int error;

	while (1) {
		error = mxt_get_info(data);
		if (!error)
			break;

		/* Check bootloader state */
		error = mxt_probe_bootloader(data, false);
		if (error) {
			dev_info(&client->dev, "Trying alternate bootloader address\n");
			error = mxt_probe_bootloader(data, true);
			if (error) {
				/* Chip is not in appmode or bootloader mode */
				return error;
			}
		}

		/* OK, we are in bootloader, see if we can recover */
		if (++recovery_attempts > 1) {
			dev_err(&client->dev, "Could not recover from bootloader mode\n");
			/*
			 * We can reflash from this state, so do not
			 * abort initialization.
			 */
			data->in_bootloader = true;
			return 0;
		}

		/* Attempt to exit bootloader into app mode */
		mxt_send_bootloader_cmd(data, false);
		msleep(MXT_FW_RESET_TIME);
	}

	/* Get object table information */
	error = mxt_get_object_table(data);
	if (error) {
		dev_err(&client->dev, "Error %d reading object table\n", error);
		return error;
	}

	error = mxt_acquire_irq(data);
	if (error)
		goto err_free_object_table;

	error = request_firmware_nowait(THIS_MODULE, true, MXT_CFG_NAME,
					&client->dev, GFP_KERNEL, data,
					mxt_config_cb);
	if (error) {
		dev_err(&client->dev, "Failed to invoke firmware loader: %d\n",
			error);
		goto err_free_object_table;
	}

	return 0;

err_free_object_table:
	mxt_free_object_table(data);
	return error;
}

static int mxt_set_t7_power_cfg(struct mxt_data *data, u8 sleep)
{
	struct device *dev = &data->client->dev;
	int error;
	struct t7_config *new_config;
	struct t7_config deepsleep = { .active = 0, .idle = 0 };

	if (sleep == MXT_POWER_CFG_DEEPSLEEP)
		new_config = &deepsleep;
	else
		new_config = &data->t7_cfg;

	error = __mxt_write_reg(data->client, data->T7_address,
				sizeof(data->t7_cfg), new_config);
	if (error)
		return error;

	dev_dbg(dev, "Set T7 ACTV:%d IDLE:%d\n",
		new_config->active, new_config->idle);

	return 0;
}

static int mxt_init_t7_power_cfg(struct mxt_data *data)
{
	struct device *dev = &data->client->dev;
	int error;
	bool retry = false;

recheck:
	error = __mxt_read_reg(data->client, data->T7_address,
				sizeof(data->t7_cfg), &data->t7_cfg);
	if (error)
		return error;

	if (data->t7_cfg.active == 0 || data->t7_cfg.idle == 0) {
		if (!retry) {
			dev_dbg(dev, "T7 cfg zero, resetting\n");
			mxt_soft_reset(data);
			retry = true;
			goto recheck;
		} else {
			dev_dbg(dev, "T7 cfg zero after reset, overriding\n");
			data->t7_cfg.active = 20;
			data->t7_cfg.idle = 100;
			return mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);
		}
	}

	dev_dbg(dev, "Initialized power cfg: ACTV %d, IDLE %d\n",
		data->t7_cfg.active, data->t7_cfg.idle);
	return 0;
}

static int mxt_configure_objects(struct mxt_data *data,
				 const struct firmware *cfg)
{
	struct device *dev = &data->client->dev;
	struct mxt_info *info = &data->info;
	int error;

	error = mxt_init_t7_power_cfg(data);
	if (error) {
		dev_err(dev, "Failed to initialize power cfg\n");
		return error;
	}

	if (cfg) {
		error = mxt_update_cfg(data, cfg);
		if (error)
			dev_warn(dev, "Error %d updating config\n", error);
	}

	if (data->multitouch) {
		error = mxt_initialize_input_device(data);
		if (error)
			return error;
	} else {
		dev_warn(dev, "No touch object detected\n");
	}

	dev_info(dev,
		 "Family: %u Variant: %u Firmware V%u.%u.%02X Objects: %u\n",
		 info->family_id, info->variant_id, info->version >> 4,
		 info->version & 0xf, info->build, info->object_num);

	return 0;
}

/* Firmware Version is returned as Major.Minor.Build */
static ssize_t mxt_fw_version_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct mxt_data *data = dev_get_drvdata(dev);
	struct mxt_info *info = &data->info;
	return scnprintf(buf, PAGE_SIZE, "%u.%u.%02X\n",
			 info->version >> 4, info->version & 0xf, info->build);
}

/* Hardware Version is returned as FamilyID.VariantID */
static ssize_t mxt_hw_version_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct mxt_data *data = dev_get_drvdata(dev);
	struct mxt_info *info = &data->info;
	return scnprintf(buf, PAGE_SIZE, "%u.%u\n",
			 info->family_id, info->variant_id);
}

static ssize_t mxt_show_instance(char *buf, int count,
				 struct mxt_object *object, int instance,
				 const u8 *val)
{
	int i;

	if (mxt_obj_instances(object) > 1)
		count += scnprintf(buf + count, PAGE_SIZE - count,
				   "Instance %u\n", instance);

	for (i = 0; i < mxt_obj_size(object); i++)
		count += scnprintf(buf + count, PAGE_SIZE - count,
				"\t[%2u]: %02x (%d)\n", i, val[i], val[i]);
	count += scnprintf(buf + count, PAGE_SIZE - count, "\n");

	return count;
}

static ssize_t mxt_object_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct mxt_data *data = dev_get_drvdata(dev);
	struct mxt_object *object;
	int count = 0;
	int i, j;
	int error;
	u8 *obuf;

	/* Pre-allocate buffer large enough to hold max sized object. */
	obuf = kmalloc(256, GFP_KERNEL);
	if (!obuf)
		return -ENOMEM;

	error = 0;
	for (i = 0; i < data->info.object_num; i++) {
		object = data->object_table + i;

		if (!mxt_object_readable(object->type))
			continue;

		count += scnprintf(buf + count, PAGE_SIZE - count,
				"T%u:\n", object->type);

		for (j = 0; j < mxt_obj_instances(object); j++) {
			u16 size = mxt_obj_size(object);
			u16 addr = object->start_address + j * size;

			error = __mxt_read_reg(data->client, addr, size, obuf);
			if (error)
				goto done;

			count = mxt_show_instance(buf, count, object, j, obuf);
		}
	}

done:
	kfree(obuf);
	return error ?: count;
}

static int mxt_check_firmware_format(struct device *dev,
				     const struct firmware *fw)
{
	unsigned int pos = 0;
	char c;

	while (pos < fw->size) {
		c = *(fw->data + pos);

		if (c < '0' || (c > '9' && c < 'A') || c > 'F')
			return 0;

		pos++;
	}

	/*
	 * To convert file try:
	 * xxd -r -p mXTXXX__APP_VX-X-XX.enc > maxtouch.fw
	 */
	dev_err(dev, "Aborting: firmware file must be in binary format\n");

	return -EINVAL;
}

static int mxt_load_fw(struct device *dev, const char *fn)
{
	struct mxt_data *data = dev_get_drvdata(dev);
	const struct firmware *fw = NULL;
	unsigned int frame_size;
	unsigned int pos = 0;
	unsigned int retry = 0;
	unsigned int frame = 0;
	int ret;

	ret = request_firmware(&fw, fn, dev);
	if (ret) {
		dev_err(dev, "Unable to open firmware %s\n", fn);
		return ret;
	}

	/* Check for incorrect enc file */
	ret = mxt_check_firmware_format(dev, fw);
	if (ret)
		goto release_firmware;

	if (!data->in_bootloader) {
		/* Change to the bootloader mode */
		data->in_bootloader = true;

		ret = mxt_t6_command(data, MXT_COMMAND_RESET,
				     MXT_BOOT_VALUE, false);
		if (ret)
			goto release_firmware;

		msleep(MXT_RESET_TIME);

		/* Do not need to scan since we know family ID */
		ret = mxt_lookup_bootloader_address(data, 0);
		if (ret)
			goto release_firmware;

		mxt_free_input_device(data);
		mxt_free_object_table(data);
	} else {
		enable_irq(data->irq);
	}

	reinit_completion(&data->bl_completion);

	ret = mxt_check_bootloader(data, MXT_WAITING_BOOTLOAD_CMD, false);
	if (ret) {
		/* Bootloader may still be unlocked from previous attempt */
		ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA, false);
		if (ret)
			goto disable_irq;
	} else {
		dev_info(dev, "Unlocking bootloader\n");

		/* Unlock bootloader */
		ret = mxt_send_bootloader_cmd(data, true);
		if (ret)
			goto disable_irq;
	}

	while (pos < fw->size) {
		ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA, true);
		if (ret)
			goto disable_irq;

		frame_size = ((*(fw->data + pos) << 8) | *(fw->data + pos + 1));

		/* Take account of CRC bytes */
		frame_size += 2;

		/* Write one frame to device */
		ret = mxt_bootloader_write(data, fw->data + pos, frame_size);
		if (ret)
			goto disable_irq;

		ret = mxt_check_bootloader(data, MXT_FRAME_CRC_PASS, true);
		if (ret) {
			retry++;

			/* Back off by 20ms per retry */
			msleep(retry * 20);

			if (retry > 20) {
				dev_err(dev, "Retry count exceeded\n");
				goto disable_irq;
			}
		} else {
			retry = 0;
			pos += frame_size;
			frame++;
		}

		if (frame % 50 == 0)
			dev_dbg(dev, "Sent %d frames, %d/%zd bytes\n",
				frame, pos, fw->size);
	}

	/* Wait for flash. */
	ret = mxt_wait_for_completion(data, &data->bl_completion,
				      MXT_FW_RESET_TIME);
	if (ret)
		goto disable_irq;

	dev_dbg(dev, "Sent %d frames, %d bytes\n", frame, pos);

	/*
	 * Wait for device to reset. Some bootloader versions do not assert
	 * the CHG line after bootloading has finished, so ignore potential
	 * errors.
	 */
	mxt_wait_for_completion(data, &data->bl_completion, MXT_FW_RESET_TIME);

	data->in_bootloader = false;

disable_irq:
	disable_irq(data->irq);
release_firmware:
	release_firmware(fw);
	return ret;
}

static ssize_t mxt_update_fw_store(struct device *dev,
					struct device_attribute *attr,
					const char *buf, size_t count)
{
	struct mxt_data *data = dev_get_drvdata(dev);
	int error;

	error = mxt_load_fw(dev, MXT_FW_NAME);
	if (error) {
		dev_err(dev, "The firmware update failed(%d)\n", error);
		count = error;
	} else {
		dev_info(dev, "The firmware update succeeded\n");

		error = mxt_initialize(data);
		if (error)
			return error;
	}

	return count;
}

static DEVICE_ATTR(fw_version, S_IRUGO, mxt_fw_version_show, NULL);
static DEVICE_ATTR(hw_version, S_IRUGO, mxt_hw_version_show, NULL);
static DEVICE_ATTR(object, S_IRUGO, mxt_object_show, NULL);
static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mxt_update_fw_store);

static struct attribute *mxt_attrs[] = {
	&dev_attr_fw_version.attr,
	&dev_attr_hw_version.attr,
	&dev_attr_object.attr,
	&dev_attr_update_fw.attr,
	NULL
};

static const struct attribute_group mxt_attr_group = {
	.attrs = mxt_attrs,
};

static void mxt_start(struct mxt_data *data)
{
	switch (data->pdata->suspend_mode) {
	case MXT_SUSPEND_T9_CTRL:
		mxt_soft_reset(data);

		/* Touch enable */
		/* 0x83 = SCANEN | RPTEN | ENABLE */
		mxt_write_object(data,
				MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, 0x83);
		break;

	case MXT_SUSPEND_DEEP_SLEEP:
	default:
		mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);

		/* Recalibrate since chip has been in deep sleep */
		mxt_t6_command(data, MXT_COMMAND_CALIBRATE, 1, false);
		break;
	}

}

static void mxt_stop(struct mxt_data *data)
{
	switch (data->pdata->suspend_mode) {
	case MXT_SUSPEND_T9_CTRL:
		/* Touch disable */
		mxt_write_object(data,
				MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, 0);
		break;

	case MXT_SUSPEND_DEEP_SLEEP:
	default:
		mxt_set_t7_power_cfg(data, MXT_POWER_CFG_DEEPSLEEP);
		break;
	}
}

static int mxt_input_open(struct input_dev *dev)
{
	struct mxt_data *data = input_get_drvdata(dev);

	mxt_start(data);

	return 0;
}

static void mxt_input_close(struct input_dev *dev)
{
	struct mxt_data *data = input_get_drvdata(dev);

	mxt_stop(data);
}

#ifdef CONFIG_OF
static const struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client)
{
	struct mxt_platform_data *pdata;
	struct device_node *np = client->dev.of_node;
	u32 *keymap;
	int proplen, ret;

	if (!np)
		return ERR_PTR(-ENOENT);

	pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return ERR_PTR(-ENOMEM);

	if (of_find_property(np, "linux,gpio-keymap", &proplen)) {
		pdata->t19_num_keys = proplen / sizeof(u32);

		keymap = devm_kzalloc(&client->dev,
				pdata->t19_num_keys * sizeof(keymap[0]),
				GFP_KERNEL);
		if (!keymap)
			return ERR_PTR(-ENOMEM);

		ret = of_property_read_u32_array(np, "linux,gpio-keymap",
						 keymap, pdata->t19_num_keys);
		if (ret)
			dev_warn(&client->dev,
				 "Couldn't read linux,gpio-keymap: %d\n", ret);

		pdata->t19_keymap = keymap;
	}

	pdata->suspend_mode = MXT_SUSPEND_DEEP_SLEEP;

	return pdata;
}
#else
static const struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client)
{
	return ERR_PTR(-ENOENT);
}
#endif

#ifdef CONFIG_ACPI

struct mxt_acpi_platform_data {
	const char *hid;
	struct mxt_platform_data pdata;
};

static unsigned int samus_touchpad_buttons[] = {
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_RESERVED,
	BTN_LEFT
};

static struct mxt_acpi_platform_data samus_platform_data[] = {
	{
		/* Touchpad */
		.hid	= "ATML0000",
		.pdata	= {
			.t19_num_keys	= ARRAY_SIZE(samus_touchpad_buttons),
			.t19_keymap	= samus_touchpad_buttons,
		},
	},
	{
		/* Touchscreen */
		.hid	= "ATML0001",
	},
	{ }
};

static const struct dmi_system_id mxt_dmi_table[] = {
	{
		/* 2015 Google Pixel */
		.ident = "Chromebook Pixel 2",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Samus"),
		},
		.driver_data = samus_platform_data,
	},
	{ }
};

static const struct mxt_platform_data *mxt_parse_acpi(struct i2c_client *client)
{
	struct acpi_device *adev;
	const struct dmi_system_id *system_id;
	const struct mxt_acpi_platform_data *acpi_pdata;

	/*
	 * Ignore ACPI devices representing bootloader mode.
	 *
	 * This is a bit of a hack: Google Chromebook BIOS creates ACPI
	 * devices for both application and bootloader modes, but we are
	 * interested in application mode only (if device is in bootloader
	 * mode we'll end up switching into application anyway). So far
	 * application mode addresses were all above 0x40, so we'll use it
	 * as a threshold.
	 */
	if (client->addr < 0x40)
		return ERR_PTR(-ENXIO);

	adev = ACPI_COMPANION(&client->dev);
	if (!adev)
		return ERR_PTR(-ENOENT);

	system_id = dmi_first_match(mxt_dmi_table);
	if (!system_id)
		return ERR_PTR(-ENOENT);

	acpi_pdata = system_id->driver_data;
	if (!acpi_pdata)
		return ERR_PTR(-ENOENT);

	while (acpi_pdata->hid) {
		if (!strcmp(acpi_device_hid(adev), acpi_pdata->hid))
			return &acpi_pdata->pdata;

		acpi_pdata++;
	}

	return ERR_PTR(-ENOENT);
}
#else
static const struct mxt_platform_data *mxt_parse_acpi(struct i2c_client *client)
{
	return ERR_PTR(-ENOENT);
}
#endif

static const struct mxt_platform_data *
mxt_get_platform_data(struct i2c_client *client)
{
	const struct mxt_platform_data *pdata;

	pdata = dev_get_platdata(&client->dev);
	if (pdata)
		return pdata;

	pdata = mxt_parse_dt(client);
	if (!IS_ERR(pdata) || PTR_ERR(pdata) != -ENOENT)
		return pdata;

	pdata = mxt_parse_acpi(client);
	if (!IS_ERR(pdata) || PTR_ERR(pdata) != -ENOENT)
		return pdata;

	dev_err(&client->dev, "No platform data specified\n");
	return ERR_PTR(-EINVAL);
}

static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
	struct mxt_data *data;
	const struct mxt_platform_data *pdata;
	int error;

	pdata = mxt_get_platform_data(client);
	if (IS_ERR(pdata))
		return PTR_ERR(pdata);

	data = kzalloc(sizeof(struct mxt_data), GFP_KERNEL);
	if (!data) {
		dev_err(&client->dev, "Failed to allocate memory\n");
		return -ENOMEM;
	}

	snprintf(data->phys, sizeof(data->phys), "i2c-%u-%04x/input0",
		 client->adapter->nr, client->addr);

	data->client = client;
	data->pdata = pdata;
	data->irq = client->irq;
	i2c_set_clientdata(client, data);

	init_completion(&data->bl_completion);
	init_completion(&data->reset_completion);
	init_completion(&data->crc_completion);

	error = request_threaded_irq(client->irq, NULL, mxt_interrupt,
				     pdata->irqflags | IRQF_ONESHOT,
				     client->name, data);
	if (error) {
		dev_err(&client->dev, "Failed to register interrupt\n");
		goto err_free_mem;
	}

	disable_irq(client->irq);

	error = mxt_initialize(data);
	if (error)
		goto err_free_irq;

	error = sysfs_create_group(&client->dev.kobj, &mxt_attr_group);
	if (error) {
		dev_err(&client->dev, "Failure %d creating sysfs group\n",
			error);
		goto err_free_object;
	}

	return 0;

err_free_object:
	mxt_free_input_device(data);
	mxt_free_object_table(data);
err_free_irq:
	free_irq(client->irq, data);
err_free_mem:
	kfree(data);
	return error;
}

static int mxt_remove(struct i2c_client *client)
{
	struct mxt_data *data = i2c_get_clientdata(client);

	sysfs_remove_group(&client->dev.kobj, &mxt_attr_group);
	free_irq(data->irq, data);
	mxt_free_input_device(data);
	mxt_free_object_table(data);
	kfree(data);

	return 0;
}

static int __maybe_unused mxt_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct mxt_data *data = i2c_get_clientdata(client);
	struct input_dev *input_dev = data->input_dev;

	if (!input_dev)
		return 0;

	mutex_lock(&input_dev->mutex);

	if (input_dev->users)
		mxt_stop(data);

	mutex_unlock(&input_dev->mutex);

	return 0;
}

static int __maybe_unused mxt_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct mxt_data *data = i2c_get_clientdata(client);
	struct input_dev *input_dev = data->input_dev;

	if (!input_dev)
		return 0;

	mutex_lock(&input_dev->mutex);

	if (input_dev->users)
		mxt_start(data);

	mutex_unlock(&input_dev->mutex);

	return 0;
}

static SIMPLE_DEV_PM_OPS(mxt_pm_ops, mxt_suspend, mxt_resume);

static const struct of_device_id mxt_of_match[] = {
	{ .compatible = "atmel,maxtouch", },
	{},
};
MODULE_DEVICE_TABLE(of, mxt_of_match);

#ifdef CONFIG_ACPI
static const struct acpi_device_id mxt_acpi_id[] = {
	{ "ATML0000", 0 },	/* Touchpad */
	{ "ATML0001", 0 },	/* Touchscreen */
	{ }
};
MODULE_DEVICE_TABLE(acpi, mxt_acpi_id);
#endif

static const struct i2c_device_id mxt_id[] = {
	{ "qt602240_ts", 0 },
	{ "atmel_mxt_ts", 0 },
	{ "atmel_mxt_tp", 0 },
	{ "mXT224", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, mxt_id);

static struct i2c_driver mxt_driver = {
	.driver = {
		.name	= "atmel_mxt_ts",
		.of_match_table = of_match_ptr(mxt_of_match),
		.acpi_match_table = ACPI_PTR(mxt_acpi_id),
		.pm	= &mxt_pm_ops,
	},
	.probe		= mxt_probe,
	.remove		= mxt_remove,
	.id_table	= mxt_id,
};

module_i2c_driver(mxt_driver);

/* Module information */
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
MODULE_DESCRIPTION("Atmel maXTouch Touchscreen driver");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud