summaryrefslogtreecommitdiff
path: root/drivers/media/i2c/s5k5baf.c
blob: ff46d2c96cea346d1c73fd0161b3c4cad05f7ee2 (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
/*
 * Driver for Samsung S5K5BAF UXGA 1/5" 2M CMOS Image Sensor
 * with embedded SoC ISP.
 *
 * Copyright (C) 2013, Samsung Electronics Co., Ltd.
 * Andrzej Hajda <a.hajda@samsung.com>
 *
 * Based on S5K6AA driver authored by Sylwester Nawrocki
 * Copyright (C) 2013, Samsung Electronics Co., Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/media.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/of_graph.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>

#include <media/media-entity.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>
#include <media/v4l2-mediabus.h>
#include <media/v4l2-fwnode.h>

static int debug;
module_param(debug, int, 0644);

#define S5K5BAF_DRIVER_NAME		"s5k5baf"
#define S5K5BAF_DEFAULT_MCLK_FREQ	24000000U
#define S5K5BAF_CLK_NAME		"mclk"

#define S5K5BAF_FW_FILENAME		"s5k5baf-cfg.bin"
#define S5K5BAF_FW_TAG			"SF00"
#define S5K5BAG_FW_TAG_LEN		2
#define S5K5BAG_FW_MAX_COUNT		16

#define S5K5BAF_CIS_WIDTH		1600
#define S5K5BAF_CIS_HEIGHT		1200
#define S5K5BAF_WIN_WIDTH_MIN		8
#define S5K5BAF_WIN_HEIGHT_MIN		8
#define S5K5BAF_GAIN_RED_DEF		127
#define S5K5BAF_GAIN_GREEN_DEF		95
#define S5K5BAF_GAIN_BLUE_DEF		180
/* Default number of MIPI CSI-2 data lanes used */
#define S5K5BAF_DEF_NUM_LANES		1

#define AHB_MSB_ADDR_PTR		0xfcfc

/*
 * Register interface pages (the most significant word of the address)
 */
#define PAGE_IF_HW			0xd000
#define PAGE_IF_SW			0x7000

/*
 * H/W register Interface (PAGE_IF_HW)
 */
#define REG_SW_LOAD_COMPLETE		0x0014
#define REG_CMDWR_PAGE			0x0028
#define REG_CMDWR_ADDR			0x002a
#define REG_CMDRD_PAGE			0x002c
#define REG_CMDRD_ADDR			0x002e
#define REG_CMD_BUF			0x0f12
#define REG_SET_HOST_INT		0x1000
#define REG_CLEAR_HOST_INT		0x1030
#define REG_PATTERN_SET			0x3100
#define REG_PATTERN_WIDTH		0x3118
#define REG_PATTERN_HEIGHT		0x311a
#define REG_PATTERN_PARAM		0x311c

/*
 * S/W register interface (PAGE_IF_SW)
 */

/* Firmware revision information */
#define REG_FW_APIVER			0x012e
#define  S5K5BAF_FW_APIVER		0x0001
#define REG_FW_REVISION			0x0130
#define REG_FW_SENSOR_ID		0x0152

/* Initialization parameters */
/* Master clock frequency in KHz */
#define REG_I_INCLK_FREQ_L		0x01b8
#define REG_I_INCLK_FREQ_H		0x01ba
#define  MIN_MCLK_FREQ_KHZ		6000U
#define  MAX_MCLK_FREQ_KHZ		48000U
#define REG_I_USE_NPVI_CLOCKS		0x01c6
#define  NPVI_CLOCKS			1
#define REG_I_USE_NMIPI_CLOCKS		0x01c8
#define  NMIPI_CLOCKS			1
#define REG_I_BLOCK_INTERNAL_PLL_CALC	0x01ca

/* Clock configurations, n = 0..2. REG_I_* frequency unit is 4 kHz. */
#define REG_I_OPCLK_4KHZ(n)		((n) * 6 + 0x01cc)
#define REG_I_MIN_OUTRATE_4KHZ(n)	((n) * 6 + 0x01ce)
#define REG_I_MAX_OUTRATE_4KHZ(n)	((n) * 6 + 0x01d0)
#define  SCLK_PVI_FREQ			24000
#define  SCLK_MIPI_FREQ			48000
#define  PCLK_MIN_FREQ			6000
#define  PCLK_MAX_FREQ			48000
#define REG_I_USE_REGS_API		0x01de
#define REG_I_INIT_PARAMS_UPDATED	0x01e0
#define REG_I_ERROR_INFO		0x01e2

/* General purpose parameters */
#define REG_USER_BRIGHTNESS		0x01e4
#define REG_USER_CONTRAST		0x01e6
#define REG_USER_SATURATION		0x01e8
#define REG_USER_SHARPBLUR		0x01ea

#define REG_G_SPEC_EFFECTS		0x01ee
#define REG_G_ENABLE_PREV		0x01f0
#define REG_G_ENABLE_PREV_CHG		0x01f2
#define REG_G_NEW_CFG_SYNC		0x01f8
#define REG_G_PREVREQ_IN_WIDTH		0x01fa
#define REG_G_PREVREQ_IN_HEIGHT		0x01fc
#define REG_G_PREVREQ_IN_XOFFS		0x01fe
#define REG_G_PREVREQ_IN_YOFFS		0x0200
#define REG_G_PREVZOOM_IN_WIDTH		0x020a
#define REG_G_PREVZOOM_IN_HEIGHT	0x020c
#define REG_G_PREVZOOM_IN_XOFFS		0x020e
#define REG_G_PREVZOOM_IN_YOFFS		0x0210
#define REG_G_INPUTS_CHANGE_REQ		0x021a
#define REG_G_ACTIVE_PREV_CFG		0x021c
#define REG_G_PREV_CFG_CHG		0x021e
#define REG_G_PREV_OPEN_AFTER_CH	0x0220
#define REG_G_PREV_CFG_ERROR		0x0222
#define  CFG_ERROR_RANGE		0x0b
#define REG_G_PREV_CFG_BYPASS_CHANGED	0x022a
#define REG_G_ACTUAL_P_FR_TIME		0x023a
#define REG_G_ACTUAL_P_OUT_RATE		0x023c
#define REG_G_ACTUAL_C_FR_TIME		0x023e
#define REG_G_ACTUAL_C_OUT_RATE		0x0240

/* Preview control section. n = 0...4. */
#define PREG(n, x)			((n) * 0x26 + x)
#define REG_P_OUT_WIDTH(n)		PREG(n, 0x0242)
#define REG_P_OUT_HEIGHT(n)		PREG(n, 0x0244)
#define REG_P_FMT(n)			PREG(n, 0x0246)
#define REG_P_MAX_OUT_RATE(n)		PREG(n, 0x0248)
#define REG_P_MIN_OUT_RATE(n)		PREG(n, 0x024a)
#define REG_P_PVI_MASK(n)		PREG(n, 0x024c)
#define  PVI_MASK_MIPI			0x52
#define REG_P_CLK_INDEX(n)		PREG(n, 0x024e)
#define  CLK_PVI_INDEX			0
#define  CLK_MIPI_INDEX			NPVI_CLOCKS
#define REG_P_FR_RATE_TYPE(n)		PREG(n, 0x0250)
#define  FR_RATE_DYNAMIC		0
#define  FR_RATE_FIXED			1
#define  FR_RATE_FIXED_ACCURATE		2
#define REG_P_FR_RATE_Q_TYPE(n)		PREG(n, 0x0252)
#define  FR_RATE_Q_DYNAMIC		0
#define  FR_RATE_Q_BEST_FRRATE		1 /* Binning enabled */
#define  FR_RATE_Q_BEST_QUALITY		2 /* Binning disabled */
/* Frame period in 0.1 ms units */
#define REG_P_MAX_FR_TIME(n)		PREG(n, 0x0254)
#define REG_P_MIN_FR_TIME(n)		PREG(n, 0x0256)
#define  S5K5BAF_MIN_FR_TIME		333  /* x100 us */
#define  S5K5BAF_MAX_FR_TIME		6500 /* x100 us */
/* The below 5 registers are for "device correction" values */
#define REG_P_SATURATION(n)		PREG(n, 0x0258)
#define REG_P_SHARP_BLUR(n)		PREG(n, 0x025a)
#define REG_P_GLAMOUR(n)		PREG(n, 0x025c)
#define REG_P_COLORTEMP(n)		PREG(n, 0x025e)
#define REG_P_GAMMA_INDEX(n)		PREG(n, 0x0260)
#define REG_P_PREV_MIRROR(n)		PREG(n, 0x0262)
#define REG_P_CAP_MIRROR(n)		PREG(n, 0x0264)
#define REG_P_CAP_ROTATION(n)		PREG(n, 0x0266)

/* Extended image property controls */
/* Exposure time in 10 us units */
#define REG_SF_USR_EXPOSURE_L		0x03bc
#define REG_SF_USR_EXPOSURE_H		0x03be
#define REG_SF_USR_EXPOSURE_CHG		0x03c0
#define REG_SF_USR_TOT_GAIN		0x03c2
#define REG_SF_USR_TOT_GAIN_CHG		0x03c4
#define REG_SF_RGAIN			0x03c6
#define REG_SF_RGAIN_CHG		0x03c8
#define REG_SF_GGAIN			0x03ca
#define REG_SF_GGAIN_CHG		0x03cc
#define REG_SF_BGAIN			0x03ce
#define REG_SF_BGAIN_CHG		0x03d0
#define REG_SF_WBGAIN_CHG		0x03d2
#define REG_SF_FLICKER_QUANT		0x03d4
#define REG_SF_FLICKER_QUANT_CHG	0x03d6

/* Output interface (parallel/MIPI) setup */
#define REG_OIF_EN_MIPI_LANES		0x03f2
#define REG_OIF_EN_PACKETS		0x03f4
#define  EN_PACKETS_CSI2		0xc3
#define REG_OIF_CFG_CHG			0x03f6

/* Auto-algorithms enable mask */
#define REG_DBG_AUTOALG_EN		0x03f8
#define  AALG_ALL_EN			BIT(0)
#define  AALG_AE_EN			BIT(1)
#define  AALG_DIVLEI_EN			BIT(2)
#define  AALG_WB_EN			BIT(3)
#define  AALG_USE_WB_FOR_ISP		BIT(4)
#define  AALG_FLICKER_EN		BIT(5)
#define  AALG_FIT_EN			BIT(6)
#define  AALG_WRHW_EN			BIT(7)

/* Pointers to color correction matrices */
#define REG_PTR_CCM_HORIZON		0x06d0
#define REG_PTR_CCM_INCANDESCENT	0x06d4
#define REG_PTR_CCM_WARM_WHITE		0x06d8
#define REG_PTR_CCM_COOL_WHITE		0x06dc
#define REG_PTR_CCM_DL50		0x06e0
#define REG_PTR_CCM_DL65		0x06e4
#define REG_PTR_CCM_OUTDOOR		0x06ec

#define REG_ARR_CCM(n)			(0x2800 + 36 * (n))

static const char * const s5k5baf_supply_names[] = {
	"vdda",		/* Analog power supply 2.8V (2.6V to 3.0V) */
	"vddreg",	/* Regulator input power supply 1.8V (1.7V to 1.9V)
			   or 2.8V (2.6V to 3.0) */
	"vddio",	/* I/O power supply 1.8V (1.65V to 1.95V)
			   or 2.8V (2.5V to 3.1V) */
};
#define S5K5BAF_NUM_SUPPLIES ARRAY_SIZE(s5k5baf_supply_names)

struct s5k5baf_gpio {
	int gpio;
	int level;
};

enum s5k5baf_gpio_id {
	STBY,
	RST,
	NUM_GPIOS,
};

#define PAD_CIS 0
#define PAD_OUT 1
#define NUM_CIS_PADS 1
#define NUM_ISP_PADS 2

struct s5k5baf_pixfmt {
	u32 code;
	u32 colorspace;
	/* REG_P_FMT(x) register value */
	u16 reg_p_fmt;
};

struct s5k5baf_ctrls {
	struct v4l2_ctrl_handler handler;
	struct { /* Auto / manual white balance cluster */
		struct v4l2_ctrl *awb;
		struct v4l2_ctrl *gain_red;
		struct v4l2_ctrl *gain_blue;
	};
	struct { /* Mirror cluster */
		struct v4l2_ctrl *hflip;
		struct v4l2_ctrl *vflip;
	};
	struct { /* Auto exposure / manual exposure and gain cluster */
		struct v4l2_ctrl *auto_exp;
		struct v4l2_ctrl *exposure;
		struct v4l2_ctrl *gain;
	};
};

enum {
	S5K5BAF_FW_ID_PATCH,
	S5K5BAF_FW_ID_CCM,
	S5K5BAF_FW_ID_CIS,
};

struct s5k5baf_fw {
	u16 count;
	struct {
		u16 id;
		u16 offset;
	} seq[0];
	u16 data[0];
};

struct s5k5baf {
	struct s5k5baf_gpio gpios[NUM_GPIOS];
	enum v4l2_mbus_type bus_type;
	u8 nlanes;
	struct regulator_bulk_data supplies[S5K5BAF_NUM_SUPPLIES];

	struct clk *clock;
	u32 mclk_frequency;

	struct s5k5baf_fw *fw;

	struct v4l2_subdev cis_sd;
	struct media_pad cis_pad;

	struct v4l2_subdev sd;
	struct media_pad pads[NUM_ISP_PADS];

	/* protects the struct members below */
	struct mutex lock;

	int error;

	struct v4l2_rect crop_sink;
	struct v4l2_rect compose;
	struct v4l2_rect crop_source;
	/* index to s5k5baf_formats array */
	int pixfmt;
	/* actual frame interval in 100us */
	u16 fiv;
	/* requested frame interval in 100us */
	u16 req_fiv;
	/* cache for REG_DBG_AUTOALG_EN register */
	u16 auto_alg;

	struct s5k5baf_ctrls ctrls;

	unsigned int streaming:1;
	unsigned int apply_cfg:1;
	unsigned int apply_crop:1;
	unsigned int valid_auto_alg:1;
	unsigned int power;
};

static const struct s5k5baf_pixfmt s5k5baf_formats[] = {
	{ MEDIA_BUS_FMT_VYUY8_2X8,	V4L2_COLORSPACE_JPEG,	5 },
	/* range 16-240 */
	{ MEDIA_BUS_FMT_VYUY8_2X8,	V4L2_COLORSPACE_REC709,	6 },
	{ MEDIA_BUS_FMT_RGB565_2X8_BE,	V4L2_COLORSPACE_JPEG,	0 },
};

static struct v4l2_rect s5k5baf_cis_rect = {
	0, 0, S5K5BAF_CIS_WIDTH, S5K5BAF_CIS_HEIGHT
};

/* Setfile contains set of I2C command sequences. Each sequence has its ID.
 * setfile format:
 *	u8 magic[4];
 *	u16 count;		number of sequences
 *	struct {
 *		u16 id;		sequence id
 *		u16 offset;	sequence offset in data array
 *	} seq[count];
 *	u16 data[*];		array containing sequences
 *
 */
static int s5k5baf_fw_parse(struct device *dev, struct s5k5baf_fw **fw,
			    size_t count, const __le16 *data)
{
	struct s5k5baf_fw *f;
	u16 *d, i, *end;
	int ret;

	if (count < S5K5BAG_FW_TAG_LEN + 1) {
		dev_err(dev, "firmware file too short (%zu)\n", count);
		return -EINVAL;
	}

	ret = memcmp(data, S5K5BAF_FW_TAG, S5K5BAG_FW_TAG_LEN * sizeof(u16));
	if (ret != 0) {
		dev_err(dev, "invalid firmware magic number\n");
		return -EINVAL;
	}

	data += S5K5BAG_FW_TAG_LEN;
	count -= S5K5BAG_FW_TAG_LEN;

	d = devm_kzalloc(dev, count * sizeof(u16), GFP_KERNEL);
	if (!d)
		return -ENOMEM;

	for (i = 0; i < count; ++i)
		d[i] = le16_to_cpu(data[i]);

	f = (struct s5k5baf_fw *)d;
	if (count < 1 + 2 * f->count) {
		dev_err(dev, "invalid firmware header (count=%d size=%zu)\n",
			f->count, 2 * (count + S5K5BAG_FW_TAG_LEN));
		return -EINVAL;
	}
	end = d + count;
	d += 1 + 2 * f->count;

	for (i = 0; i < f->count; ++i) {
		if (f->seq[i].offset + d <= end)
			continue;
		dev_err(dev, "invalid firmware header (seq=%d)\n", i);
		return -EINVAL;
	}

	*fw = f;

	return 0;
}

static inline struct v4l2_subdev *ctrl_to_sd(struct v4l2_ctrl *ctrl)
{
	return &container_of(ctrl->handler, struct s5k5baf, ctrls.handler)->sd;
}

static inline bool s5k5baf_is_cis_subdev(struct v4l2_subdev *sd)
{
	return sd->entity.function == MEDIA_ENT_F_CAM_SENSOR;
}

static inline struct s5k5baf *to_s5k5baf(struct v4l2_subdev *sd)
{
	if (s5k5baf_is_cis_subdev(sd))
		return container_of(sd, struct s5k5baf, cis_sd);
	else
		return container_of(sd, struct s5k5baf, sd);
}

static u16 s5k5baf_i2c_read(struct s5k5baf *state, u16 addr)
{
	struct i2c_client *c = v4l2_get_subdevdata(&state->sd);
	__be16 w, r;
	u16 res;
	struct i2c_msg msg[] = {
		{ .addr = c->addr, .flags = 0,
		  .len = 2, .buf = (u8 *)&w },
		{ .addr = c->addr, .flags = I2C_M_RD,
		  .len = 2, .buf = (u8 *)&r },
	};
	int ret;

	if (state->error)
		return 0;

	w = cpu_to_be16(addr);
	ret = i2c_transfer(c->adapter, msg, 2);
	res = be16_to_cpu(r);

	v4l2_dbg(3, debug, c, "i2c_read: 0x%04x : 0x%04x\n", addr, res);

	if (ret != 2) {
		v4l2_err(c, "i2c_read: error during transfer (%d)\n", ret);
		state->error = ret;
	}
	return res;
}

static void s5k5baf_i2c_write(struct s5k5baf *state, u16 addr, u16 val)
{
	u8 buf[4] = { addr >> 8, addr & 0xFF, val >> 8, val & 0xFF };
	struct i2c_client *c = v4l2_get_subdevdata(&state->sd);
	int ret;

	if (state->error)
		return;

	ret = i2c_master_send(c, buf, 4);
	v4l2_dbg(3, debug, c, "i2c_write: 0x%04x : 0x%04x\n", addr, val);

	if (ret != 4) {
		v4l2_err(c, "i2c_write: error during transfer (%d)\n", ret);
		state->error = ret;
	}
}

static u16 s5k5baf_read(struct s5k5baf *state, u16 addr)
{
	s5k5baf_i2c_write(state, REG_CMDRD_ADDR, addr);
	return s5k5baf_i2c_read(state, REG_CMD_BUF);
}

static void s5k5baf_write(struct s5k5baf *state, u16 addr, u16 val)
{
	s5k5baf_i2c_write(state, REG_CMDWR_ADDR, addr);
	s5k5baf_i2c_write(state, REG_CMD_BUF, val);
}

static void s5k5baf_write_arr_seq(struct s5k5baf *state, u16 addr,
				  u16 count, const u16 *seq)
{
	struct i2c_client *c = v4l2_get_subdevdata(&state->sd);
	__be16 buf[65];

	s5k5baf_i2c_write(state, REG_CMDWR_ADDR, addr);
	if (state->error)
		return;

	v4l2_dbg(3, debug, c, "i2c_write_seq(count=%d): %*ph\n", count,
		 min(2 * count, 64), seq);

	buf[0] = cpu_to_be16(REG_CMD_BUF);

	while (count > 0) {
		int n = min_t(int, count, ARRAY_SIZE(buf) - 1);
		int ret, i;

		for (i = 1; i <= n; ++i)
			buf[i] = cpu_to_be16(*seq++);

		i *= 2;
		ret = i2c_master_send(c, (char *)buf, i);
		if (ret != i) {
			v4l2_err(c, "i2c_write_seq: error during transfer (%d)\n", ret);
			state->error = ret;
			break;
		}

		count -= n;
	}
}

#define s5k5baf_write_seq(state, addr, seq...) \
	s5k5baf_write_arr_seq(state, addr, sizeof((char[]){ seq }), \
			      (const u16 []){ seq });

/* add items count at the beginning of the list */
#define NSEQ(seq...) sizeof((char[]){ seq }), seq

/*
 * s5k5baf_write_nseq() - Writes sequences of values to sensor memory via i2c
 * @nseq: sequence of u16 words in format:
 *	(N, address, value[1]...value[N-1])*,0
 * Ex.:
 *	u16 seq[] = { NSEQ(0x4000, 1, 1), NSEQ(0x4010, 640, 480), 0 };
 *	ret = s5k5baf_write_nseq(c, seq);
 */
static void s5k5baf_write_nseq(struct s5k5baf *state, const u16 *nseq)
{
	int count;

	while ((count = *nseq++)) {
		u16 addr = *nseq++;
		--count;

		s5k5baf_write_arr_seq(state, addr, count, nseq);
		nseq += count;
	}
}

static void s5k5baf_synchronize(struct s5k5baf *state, int timeout, u16 addr)
{
	unsigned long end = jiffies + msecs_to_jiffies(timeout);
	u16 reg;

	s5k5baf_write(state, addr, 1);
	do {
		reg = s5k5baf_read(state, addr);
		if (state->error || !reg)
			return;
		usleep_range(5000, 10000);
	} while (time_is_after_jiffies(end));

	v4l2_err(&state->sd, "timeout on register synchronize (%#x)\n", addr);
	state->error = -ETIMEDOUT;
}

static u16 *s5k5baf_fw_get_seq(struct s5k5baf *state, u16 seq_id)
{
	struct s5k5baf_fw *fw = state->fw;
	u16 *data;
	int i;

	if (fw == NULL)
		return NULL;

	data = fw->data + 2 * fw->count;

	for (i = 0; i < fw->count; ++i) {
		if (fw->seq[i].id == seq_id)
			return data + fw->seq[i].offset;
	}

	return NULL;
}

static void s5k5baf_hw_patch(struct s5k5baf *state)
{
	u16 *seq = s5k5baf_fw_get_seq(state, S5K5BAF_FW_ID_PATCH);

	if (seq)
		s5k5baf_write_nseq(state, seq);
}

static void s5k5baf_hw_set_clocks(struct s5k5baf *state)
{
	unsigned long mclk = state->mclk_frequency / 1000;
	u16 status;
	static const u16 nseq_clk_cfg[] = {
		NSEQ(REG_I_USE_NPVI_CLOCKS,
		  NPVI_CLOCKS, NMIPI_CLOCKS, 0,
		  SCLK_PVI_FREQ / 4, PCLK_MIN_FREQ / 4, PCLK_MAX_FREQ / 4,
		  SCLK_MIPI_FREQ / 4, PCLK_MIN_FREQ / 4, PCLK_MAX_FREQ / 4),
		NSEQ(REG_I_USE_REGS_API, 1),
		0
	};

	s5k5baf_write_seq(state, REG_I_INCLK_FREQ_L, mclk & 0xffff, mclk >> 16);
	s5k5baf_write_nseq(state, nseq_clk_cfg);

	s5k5baf_synchronize(state, 250, REG_I_INIT_PARAMS_UPDATED);
	status = s5k5baf_read(state, REG_I_ERROR_INFO);
	if (!state->error && status) {
		v4l2_err(&state->sd, "error configuring PLL (%d)\n", status);
		state->error = -EINVAL;
	}
}

/* set custom color correction matrices for various illuminations */
static void s5k5baf_hw_set_ccm(struct s5k5baf *state)
{
	u16 *seq = s5k5baf_fw_get_seq(state, S5K5BAF_FW_ID_CCM);

	if (seq)
		s5k5baf_write_nseq(state, seq);
}

/* CIS sensor tuning, based on undocumented android driver code */
static void s5k5baf_hw_set_cis(struct s5k5baf *state)
{
	u16 *seq = s5k5baf_fw_get_seq(state, S5K5BAF_FW_ID_CIS);

	if (!seq)
		return;

	s5k5baf_i2c_write(state, REG_CMDWR_PAGE, PAGE_IF_HW);
	s5k5baf_write_nseq(state, seq);
	s5k5baf_i2c_write(state, REG_CMDWR_PAGE, PAGE_IF_SW);
}

static void s5k5baf_hw_sync_cfg(struct s5k5baf *state)
{
	s5k5baf_write(state, REG_G_PREV_CFG_CHG, 1);
	if (state->apply_crop) {
		s5k5baf_write(state, REG_G_INPUTS_CHANGE_REQ, 1);
		s5k5baf_write(state, REG_G_PREV_CFG_BYPASS_CHANGED, 1);
	}
	s5k5baf_synchronize(state, 500, REG_G_NEW_CFG_SYNC);
}
/* Set horizontal and vertical image flipping */
static void s5k5baf_hw_set_mirror(struct s5k5baf *state)
{
	u16 flip = state->ctrls.vflip->val | (state->ctrls.vflip->val << 1);

	s5k5baf_write(state, REG_P_PREV_MIRROR(0), flip);
	if (state->streaming)
		s5k5baf_hw_sync_cfg(state);
}

static void s5k5baf_hw_set_alg(struct s5k5baf *state, u16 alg, bool enable)
{
	u16 cur_alg, new_alg;

	if (!state->valid_auto_alg)
		cur_alg = s5k5baf_read(state, REG_DBG_AUTOALG_EN);
	else
		cur_alg = state->auto_alg;

	new_alg = enable ? (cur_alg | alg) : (cur_alg & ~alg);

	if (new_alg != cur_alg)
		s5k5baf_write(state, REG_DBG_AUTOALG_EN, new_alg);

	if (state->error)
		return;

	state->valid_auto_alg = 1;
	state->auto_alg = new_alg;
}

/* Configure auto/manual white balance and R/G/B gains */
static void s5k5baf_hw_set_awb(struct s5k5baf *state, int awb)
{
	struct s5k5baf_ctrls *ctrls = &state->ctrls;

	if (!awb)
		s5k5baf_write_seq(state, REG_SF_RGAIN,
				  ctrls->gain_red->val, 1,
				  S5K5BAF_GAIN_GREEN_DEF, 1,
				  ctrls->gain_blue->val, 1,
				  1);

	s5k5baf_hw_set_alg(state, AALG_WB_EN, awb);
}

/* Program FW with exposure time, 'exposure' in us units */
static void s5k5baf_hw_set_user_exposure(struct s5k5baf *state, int exposure)
{
	unsigned int time = exposure / 10;

	s5k5baf_write_seq(state, REG_SF_USR_EXPOSURE_L,
			  time & 0xffff, time >> 16, 1);
}

static void s5k5baf_hw_set_user_gain(struct s5k5baf *state, int gain)
{
	s5k5baf_write_seq(state, REG_SF_USR_TOT_GAIN, gain, 1);
}

/* Set auto/manual exposure and total gain */
static void s5k5baf_hw_set_auto_exposure(struct s5k5baf *state, int value)
{
	if (value == V4L2_EXPOSURE_AUTO) {
		s5k5baf_hw_set_alg(state, AALG_AE_EN | AALG_DIVLEI_EN, true);
	} else {
		unsigned int exp_time = state->ctrls.exposure->val;

		s5k5baf_hw_set_user_exposure(state, exp_time);
		s5k5baf_hw_set_user_gain(state, state->ctrls.gain->val);
		s5k5baf_hw_set_alg(state, AALG_AE_EN | AALG_DIVLEI_EN, false);
	}
}

static void s5k5baf_hw_set_anti_flicker(struct s5k5baf *state, int v)
{
	if (v == V4L2_CID_POWER_LINE_FREQUENCY_AUTO) {
		s5k5baf_hw_set_alg(state, AALG_FLICKER_EN, true);
	} else {
		/* The V4L2_CID_LINE_FREQUENCY control values match
		 * the register values */
		s5k5baf_write_seq(state, REG_SF_FLICKER_QUANT, v, 1);
		s5k5baf_hw_set_alg(state, AALG_FLICKER_EN, false);
	}
}

static void s5k5baf_hw_set_colorfx(struct s5k5baf *state, int val)
{
	static const u16 colorfx[] = {
		[V4L2_COLORFX_NONE] = 0,
		[V4L2_COLORFX_BW] = 1,
		[V4L2_COLORFX_NEGATIVE] = 2,
		[V4L2_COLORFX_SEPIA] = 3,
		[V4L2_COLORFX_SKY_BLUE] = 4,
		[V4L2_COLORFX_SKETCH] = 5,
	};

	s5k5baf_write(state, REG_G_SPEC_EFFECTS, colorfx[val]);
}

static int s5k5baf_find_pixfmt(struct v4l2_mbus_framefmt *mf)
{
	int i, c = -1;

	for (i = 0; i < ARRAY_SIZE(s5k5baf_formats); i++) {
		if (mf->colorspace != s5k5baf_formats[i].colorspace)
			continue;
		if (mf->code == s5k5baf_formats[i].code)
			return i;
		if (c < 0)
			c = i;
	}
	return (c < 0) ? 0 : c;
}

static int s5k5baf_clear_error(struct s5k5baf *state)
{
	int ret = state->error;

	state->error = 0;
	return ret;
}

static int s5k5baf_hw_set_video_bus(struct s5k5baf *state)
{
	u16 en_pkts;

	if (state->bus_type == V4L2_MBUS_CSI2)
		en_pkts = EN_PACKETS_CSI2;
	else
		en_pkts = 0;

	s5k5baf_write_seq(state, REG_OIF_EN_MIPI_LANES,
			  state->nlanes, en_pkts, 1);

	return s5k5baf_clear_error(state);
}

static u16 s5k5baf_get_cfg_error(struct s5k5baf *state)
{
	u16 err = s5k5baf_read(state, REG_G_PREV_CFG_ERROR);
	if (err)
		s5k5baf_write(state, REG_G_PREV_CFG_ERROR, 0);
	return err;
}

static void s5k5baf_hw_set_fiv(struct s5k5baf *state, u16 fiv)
{
	s5k5baf_write(state, REG_P_MAX_FR_TIME(0), fiv);
	s5k5baf_hw_sync_cfg(state);
}

static void s5k5baf_hw_find_min_fiv(struct s5k5baf *state)
{
	u16 err, fiv;
	int n;

	fiv = s5k5baf_read(state,  REG_G_ACTUAL_P_FR_TIME);
	if (state->error)
		return;

	for (n = 5; n > 0; --n) {
		s5k5baf_hw_set_fiv(state, fiv);
		err = s5k5baf_get_cfg_error(state);
		if (state->error)
			return;
		switch (err) {
		case CFG_ERROR_RANGE:
			++fiv;
			break;
		case 0:
			state->fiv = fiv;
			v4l2_info(&state->sd,
				  "found valid frame interval: %d00us\n", fiv);
			return;
		default:
			v4l2_err(&state->sd,
				 "error setting frame interval: %d\n", err);
			state->error = -EINVAL;
		}
	}
	v4l2_err(&state->sd, "cannot find correct frame interval\n");
	state->error = -ERANGE;
}

static void s5k5baf_hw_validate_cfg(struct s5k5baf *state)
{
	u16 err;

	err = s5k5baf_get_cfg_error(state);
	if (state->error)
		return;

	switch (err) {
	case 0:
		state->apply_cfg = 1;
		return;
	case CFG_ERROR_RANGE:
		s5k5baf_hw_find_min_fiv(state);
		if (!state->error)
			state->apply_cfg = 1;
		return;
	default:
		v4l2_err(&state->sd,
			 "error setting format: %d\n", err);
		state->error = -EINVAL;
	}
}

static void s5k5baf_rescale(struct v4l2_rect *r, const struct v4l2_rect *v,
			    const struct v4l2_rect *n,
			    const struct v4l2_rect *d)
{
	r->left = v->left * n->width / d->width;
	r->top = v->top * n->height / d->height;
	r->width = v->width * n->width / d->width;
	r->height = v->height * n->height / d->height;
}

static int s5k5baf_hw_set_crop_rects(struct s5k5baf *state)
{
	struct v4l2_rect *p, r;
	u16 err;
	int ret;

	p = &state->crop_sink;
	s5k5baf_write_seq(state, REG_G_PREVREQ_IN_WIDTH, p->width, p->height,
			  p->left, p->top);

	s5k5baf_rescale(&r, &state->crop_source, &state->crop_sink,
			&state->compose);
	s5k5baf_write_seq(state, REG_G_PREVZOOM_IN_WIDTH, r.width, r.height,
			  r.left, r.top);

	s5k5baf_synchronize(state, 500, REG_G_INPUTS_CHANGE_REQ);
	s5k5baf_synchronize(state, 500, REG_G_PREV_CFG_BYPASS_CHANGED);
	err = s5k5baf_get_cfg_error(state);
	ret = s5k5baf_clear_error(state);
	if (ret < 0)
		return ret;

	switch (err) {
	case 0:
		break;
	case CFG_ERROR_RANGE:
		/* retry crop with frame interval set to max */
		s5k5baf_hw_set_fiv(state, S5K5BAF_MAX_FR_TIME);
		err = s5k5baf_get_cfg_error(state);
		ret = s5k5baf_clear_error(state);
		if (ret < 0)
			return ret;
		if (err) {
			v4l2_err(&state->sd,
				 "crop error on max frame interval: %d\n", err);
			state->error = -EINVAL;
		}
		s5k5baf_hw_set_fiv(state, state->req_fiv);
		s5k5baf_hw_validate_cfg(state);
		break;
	default:
		v4l2_err(&state->sd, "crop error: %d\n", err);
		return -EINVAL;
	}

	if (!state->apply_cfg)
		return 0;

	p = &state->crop_source;
	s5k5baf_write_seq(state, REG_P_OUT_WIDTH(0), p->width, p->height);
	s5k5baf_hw_set_fiv(state, state->req_fiv);
	s5k5baf_hw_validate_cfg(state);

	return s5k5baf_clear_error(state);
}

static void s5k5baf_hw_set_config(struct s5k5baf *state)
{
	u16 reg_fmt = s5k5baf_formats[state->pixfmt].reg_p_fmt;
	struct v4l2_rect *r = &state->crop_source;

	s5k5baf_write_seq(state, REG_P_OUT_WIDTH(0),
			  r->width, r->height, reg_fmt,
			  PCLK_MAX_FREQ >> 2, PCLK_MIN_FREQ >> 2,
			  PVI_MASK_MIPI, CLK_MIPI_INDEX,
			  FR_RATE_FIXED, FR_RATE_Q_DYNAMIC,
			  state->req_fiv, S5K5BAF_MIN_FR_TIME);
	s5k5baf_hw_sync_cfg(state);
	s5k5baf_hw_validate_cfg(state);
}


static void s5k5baf_hw_set_test_pattern(struct s5k5baf *state, int id)
{
	s5k5baf_i2c_write(state, REG_PATTERN_WIDTH, 800);
	s5k5baf_i2c_write(state, REG_PATTERN_HEIGHT, 511);
	s5k5baf_i2c_write(state, REG_PATTERN_PARAM, 0);
	s5k5baf_i2c_write(state, REG_PATTERN_SET, id);
}

static void s5k5baf_gpio_assert(struct s5k5baf *state, int id)
{
	struct s5k5baf_gpio *gpio = &state->gpios[id];

	gpio_set_value(gpio->gpio, gpio->level);
}

static void s5k5baf_gpio_deassert(struct s5k5baf *state, int id)
{
	struct s5k5baf_gpio *gpio = &state->gpios[id];

	gpio_set_value(gpio->gpio, !gpio->level);
}

static int s5k5baf_power_on(struct s5k5baf *state)
{
	int ret;

	ret = regulator_bulk_enable(S5K5BAF_NUM_SUPPLIES, state->supplies);
	if (ret < 0)
		goto err;

	ret = clk_set_rate(state->clock, state->mclk_frequency);
	if (ret < 0)
		goto err_reg_dis;

	ret = clk_prepare_enable(state->clock);
	if (ret < 0)
		goto err_reg_dis;

	v4l2_dbg(1, debug, &state->sd, "clock frequency: %ld\n",
		 clk_get_rate(state->clock));

	s5k5baf_gpio_deassert(state, STBY);
	usleep_range(50, 100);
	s5k5baf_gpio_deassert(state, RST);
	return 0;

err_reg_dis:
	regulator_bulk_disable(S5K5BAF_NUM_SUPPLIES, state->supplies);
err:
	v4l2_err(&state->sd, "%s() failed (%d)\n", __func__, ret);
	return ret;
}

static int s5k5baf_power_off(struct s5k5baf *state)
{
	int ret;

	state->streaming = 0;
	state->apply_cfg = 0;
	state->apply_crop = 0;

	s5k5baf_gpio_assert(state, RST);
	s5k5baf_gpio_assert(state, STBY);

	if (!IS_ERR(state->clock))
		clk_disable_unprepare(state->clock);

	ret = regulator_bulk_disable(S5K5BAF_NUM_SUPPLIES,
					state->supplies);
	if (ret < 0)
		v4l2_err(&state->sd, "failed to disable regulators\n");

	return 0;
}

static void s5k5baf_hw_init(struct s5k5baf *state)
{
	s5k5baf_i2c_write(state, AHB_MSB_ADDR_PTR, PAGE_IF_HW);
	s5k5baf_i2c_write(state, REG_CLEAR_HOST_INT, 0);
	s5k5baf_i2c_write(state, REG_SW_LOAD_COMPLETE, 1);
	s5k5baf_i2c_write(state, REG_CMDRD_PAGE, PAGE_IF_SW);
	s5k5baf_i2c_write(state, REG_CMDWR_PAGE, PAGE_IF_SW);
}

/*
 * V4L2 subdev core and video operations
 */

static void s5k5baf_initialize_data(struct s5k5baf *state)
{
	state->pixfmt = 0;
	state->req_fiv = 10000 / 15;
	state->fiv = state->req_fiv;
	state->valid_auto_alg = 0;
}

static int s5k5baf_load_setfile(struct s5k5baf *state)
{
	struct i2c_client *c = v4l2_get_subdevdata(&state->sd);
	const struct firmware *fw;
	int ret;

	ret = request_firmware(&fw, S5K5BAF_FW_FILENAME, &c->dev);
	if (ret < 0) {
		dev_warn(&c->dev, "firmware file (%s) not loaded\n",
			 S5K5BAF_FW_FILENAME);
		return ret;
	}

	ret = s5k5baf_fw_parse(&c->dev, &state->fw, fw->size / 2,
			       (__le16 *)fw->data);

	release_firmware(fw);

	return ret;
}

static int s5k5baf_set_power(struct v4l2_subdev *sd, int on)
{
	struct s5k5baf *state = to_s5k5baf(sd);
	int ret = 0;

	mutex_lock(&state->lock);

	if (state->power != !on)
		goto out;

	if (on) {
		if (state->fw == NULL)
			s5k5baf_load_setfile(state);

		s5k5baf_initialize_data(state);
		ret = s5k5baf_power_on(state);
		if (ret < 0)
			goto out;

		s5k5baf_hw_init(state);
		s5k5baf_hw_patch(state);
		s5k5baf_i2c_write(state, REG_SET_HOST_INT, 1);
		s5k5baf_hw_set_clocks(state);

		ret = s5k5baf_hw_set_video_bus(state);
		if (ret < 0)
			goto out;

		s5k5baf_hw_set_cis(state);
		s5k5baf_hw_set_ccm(state);

		ret = s5k5baf_clear_error(state);
		if (!ret)
			state->power++;
	} else {
		s5k5baf_power_off(state);
		state->power--;
	}

out:
	mutex_unlock(&state->lock);

	if (!ret && on)
		ret = v4l2_ctrl_handler_setup(&state->ctrls.handler);

	return ret;
}

static void s5k5baf_hw_set_stream(struct s5k5baf *state, int enable)
{
	s5k5baf_write_seq(state, REG_G_ENABLE_PREV, enable, 1);
}

static int s5k5baf_s_stream(struct v4l2_subdev *sd, int on)
{
	struct s5k5baf *state = to_s5k5baf(sd);
	int ret;

	mutex_lock(&state->lock);

	if (state->streaming == !!on) {
		ret = 0;
		goto out;
	}

	if (on) {
		s5k5baf_hw_set_config(state);
		ret = s5k5baf_hw_set_crop_rects(state);
		if (ret < 0)
			goto out;
		s5k5baf_hw_set_stream(state, 1);
		s5k5baf_i2c_write(state, 0xb0cc, 0x000b);
	} else {
		s5k5baf_hw_set_stream(state, 0);
	}
	ret = s5k5baf_clear_error(state);
	if (!ret)
		state->streaming = !state->streaming;

out:
	mutex_unlock(&state->lock);

	return ret;
}

static int s5k5baf_g_frame_interval(struct v4l2_subdev *sd,
				   struct v4l2_subdev_frame_interval *fi)
{
	struct s5k5baf *state = to_s5k5baf(sd);

	mutex_lock(&state->lock);
	fi->interval.numerator = state->fiv;
	fi->interval.denominator = 10000;
	mutex_unlock(&state->lock);

	return 0;
}

static void s5k5baf_set_frame_interval(struct s5k5baf *state,
				       struct v4l2_subdev_frame_interval *fi)
{
	struct v4l2_fract *i = &fi->interval;

	if (fi->interval.denominator == 0)
		state->req_fiv = S5K5BAF_MAX_FR_TIME;
	else
		state->req_fiv = clamp_t(u32,
					 i->numerator * 10000 / i->denominator,
					 S5K5BAF_MIN_FR_TIME,
					 S5K5BAF_MAX_FR_TIME);

	state->fiv = state->req_fiv;
	if (state->apply_cfg) {
		s5k5baf_hw_set_fiv(state, state->req_fiv);
		s5k5baf_hw_validate_cfg(state);
	}
	*i = (struct v4l2_fract){ state->fiv, 10000 };
	if (state->fiv == state->req_fiv)
		v4l2_info(&state->sd, "frame interval changed to %d00us\n",
			  state->fiv);
}

static int s5k5baf_s_frame_interval(struct v4l2_subdev *sd,
				   struct v4l2_subdev_frame_interval *fi)
{
	struct s5k5baf *state = to_s5k5baf(sd);

	mutex_lock(&state->lock);
	s5k5baf_set_frame_interval(state, fi);
	mutex_unlock(&state->lock);
	return 0;
}

/*
 * V4L2 subdev pad level and video operations
 */
static int s5k5baf_enum_frame_interval(struct v4l2_subdev *sd,
			      struct v4l2_subdev_pad_config *cfg,
			      struct v4l2_subdev_frame_interval_enum *fie)
{
	if (fie->index > S5K5BAF_MAX_FR_TIME - S5K5BAF_MIN_FR_TIME ||
	    fie->pad != PAD_CIS)
		return -EINVAL;

	v4l_bound_align_image(&fie->width, S5K5BAF_WIN_WIDTH_MIN,
			      S5K5BAF_CIS_WIDTH, 1,
			      &fie->height, S5K5BAF_WIN_HEIGHT_MIN,
			      S5K5BAF_CIS_HEIGHT, 1, 0);

	fie->interval.numerator = S5K5BAF_MIN_FR_TIME + fie->index;
	fie->interval.denominator = 10000;

	return 0;
}

static int s5k5baf_enum_mbus_code(struct v4l2_subdev *sd,
				 struct v4l2_subdev_pad_config *cfg,
				 struct v4l2_subdev_mbus_code_enum *code)
{
	if (code->pad == PAD_CIS) {
		if (code->index > 0)
			return -EINVAL;
		code->code = MEDIA_BUS_FMT_FIXED;
		return 0;
	}

	if (code->index >= ARRAY_SIZE(s5k5baf_formats))
		return -EINVAL;

	code->code = s5k5baf_formats[code->index].code;
	return 0;
}

static int s5k5baf_enum_frame_size(struct v4l2_subdev *sd,
				  struct v4l2_subdev_pad_config *cfg,
				  struct v4l2_subdev_frame_size_enum *fse)
{
	int i;

	if (fse->index > 0)
		return -EINVAL;

	if (fse->pad == PAD_CIS) {
		fse->code = MEDIA_BUS_FMT_FIXED;
		fse->min_width = S5K5BAF_CIS_WIDTH;
		fse->max_width = S5K5BAF_CIS_WIDTH;
		fse->min_height = S5K5BAF_CIS_HEIGHT;
		fse->max_height = S5K5BAF_CIS_HEIGHT;
		return 0;
	}

	i = ARRAY_SIZE(s5k5baf_formats);
	while (--i)
		if (fse->code == s5k5baf_formats[i].code)
			break;
	fse->code = s5k5baf_formats[i].code;
	fse->min_width = S5K5BAF_WIN_WIDTH_MIN;
	fse->max_width = S5K5BAF_CIS_WIDTH;
	fse->max_height = S5K5BAF_WIN_HEIGHT_MIN;
	fse->min_height = S5K5BAF_CIS_HEIGHT;

	return 0;
}

static void s5k5baf_try_cis_format(struct v4l2_mbus_framefmt *mf)
{
	mf->width = S5K5BAF_CIS_WIDTH;
	mf->height = S5K5BAF_CIS_HEIGHT;
	mf->code = MEDIA_BUS_FMT_FIXED;
	mf->colorspace = V4L2_COLORSPACE_JPEG;
	mf->field = V4L2_FIELD_NONE;
}

static int s5k5baf_try_isp_format(struct v4l2_mbus_framefmt *mf)
{
	int pixfmt;

	v4l_bound_align_image(&mf->width, S5K5BAF_WIN_WIDTH_MIN,
			      S5K5BAF_CIS_WIDTH, 1,
			      &mf->height, S5K5BAF_WIN_HEIGHT_MIN,
			      S5K5BAF_CIS_HEIGHT, 1, 0);

	pixfmt = s5k5baf_find_pixfmt(mf);

	mf->colorspace = s5k5baf_formats[pixfmt].colorspace;
	mf->code = s5k5baf_formats[pixfmt].code;
	mf->field = V4L2_FIELD_NONE;

	return pixfmt;
}

static int s5k5baf_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg,
			  struct v4l2_subdev_format *fmt)
{
	struct s5k5baf *state = to_s5k5baf(sd);
	const struct s5k5baf_pixfmt *pixfmt;
	struct v4l2_mbus_framefmt *mf;

	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
		mf = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
		fmt->format = *mf;
		return 0;
	}

	mf = &fmt->format;
	if (fmt->pad == PAD_CIS) {
		s5k5baf_try_cis_format(mf);
		return 0;
	}
	mf->field = V4L2_FIELD_NONE;
	mutex_lock(&state->lock);
	pixfmt = &s5k5baf_formats[state->pixfmt];
	mf->width = state->crop_source.width;
	mf->height = state->crop_source.height;
	mf->code = pixfmt->code;
	mf->colorspace = pixfmt->colorspace;
	mutex_unlock(&state->lock);

	return 0;
}

static int s5k5baf_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg,
			  struct v4l2_subdev_format *fmt)
{
	struct v4l2_mbus_framefmt *mf = &fmt->format;
	struct s5k5baf *state = to_s5k5baf(sd);
	const struct s5k5baf_pixfmt *pixfmt;
	int ret = 0;

	mf->field = V4L2_FIELD_NONE;

	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
		*v4l2_subdev_get_try_format(sd, cfg, fmt->pad) = *mf;
		return 0;
	}

	if (fmt->pad == PAD_CIS) {
		s5k5baf_try_cis_format(mf);
		return 0;
	}

	mutex_lock(&state->lock);

	if (state->streaming) {
		mutex_unlock(&state->lock);
		return -EBUSY;
	}

	state->pixfmt = s5k5baf_try_isp_format(mf);
	pixfmt = &s5k5baf_formats[state->pixfmt];
	mf->code = pixfmt->code;
	mf->colorspace = pixfmt->colorspace;
	mf->width = state->crop_source.width;
	mf->height = state->crop_source.height;

	mutex_unlock(&state->lock);
	return ret;
}

enum selection_rect { R_CIS, R_CROP_SINK, R_COMPOSE, R_CROP_SOURCE, R_INVALID };

static enum selection_rect s5k5baf_get_sel_rect(u32 pad, u32 target)
{
	switch (target) {
	case V4L2_SEL_TGT_CROP_BOUNDS:
		return pad ? R_COMPOSE : R_CIS;
	case V4L2_SEL_TGT_CROP:
		return pad ? R_CROP_SOURCE : R_CROP_SINK;
	case V4L2_SEL_TGT_COMPOSE_BOUNDS:
		return pad ? R_INVALID : R_CROP_SINK;
	case V4L2_SEL_TGT_COMPOSE:
		return pad ? R_INVALID : R_COMPOSE;
	default:
		return R_INVALID;
	}
}

static int s5k5baf_is_bound_target(u32 target)
{
	return target == V4L2_SEL_TGT_CROP_BOUNDS ||
		target == V4L2_SEL_TGT_COMPOSE_BOUNDS;
}

static int s5k5baf_get_selection(struct v4l2_subdev *sd,
				 struct v4l2_subdev_pad_config *cfg,
				 struct v4l2_subdev_selection *sel)
{
	enum selection_rect rtype;
	struct s5k5baf *state = to_s5k5baf(sd);

	rtype = s5k5baf_get_sel_rect(sel->pad, sel->target);

	switch (rtype) {
	case R_INVALID:
		return -EINVAL;
	case R_CIS:
		sel->r = s5k5baf_cis_rect;
		return 0;
	default:
		break;
	}

	if (sel->which == V4L2_SUBDEV_FORMAT_TRY) {
		if (rtype == R_COMPOSE)
			sel->r = *v4l2_subdev_get_try_compose(sd, cfg, sel->pad);
		else
			sel->r = *v4l2_subdev_get_try_crop(sd, cfg, sel->pad);
		return 0;
	}

	mutex_lock(&state->lock);
	switch (rtype) {
	case R_CROP_SINK:
		sel->r = state->crop_sink;
		break;
	case R_COMPOSE:
		sel->r = state->compose;
		break;
	case R_CROP_SOURCE:
		sel->r = state->crop_source;
		break;
	default:
		break;
	}
	if (s5k5baf_is_bound_target(sel->target)) {
		sel->r.left = 0;
		sel->r.top = 0;
	}
	mutex_unlock(&state->lock);

	return 0;
}

/* bounds range [start, start+len) to [0, max) and aligns to 2 */
static void s5k5baf_bound_range(u32 *start, u32 *len, u32 max)
{
	if (*len > max)
		*len = max;
	if (*start + *len > max)
		*start = max - *len;
	*start &= ~1;
	*len &= ~1;
	if (*len < S5K5BAF_WIN_WIDTH_MIN)
		*len = S5K5BAF_WIN_WIDTH_MIN;
}

static void s5k5baf_bound_rect(struct v4l2_rect *r, u32 width, u32 height)
{
	s5k5baf_bound_range(&r->left, &r->width, width);
	s5k5baf_bound_range(&r->top, &r->height, height);
}

static void s5k5baf_set_rect_and_adjust(struct v4l2_rect **rects,
					enum selection_rect first,
					struct v4l2_rect *v)
{
	struct v4l2_rect *r, *br;
	enum selection_rect i = first;

	*rects[first] = *v;
	do {
		r = rects[i];
		br = rects[i - 1];
		s5k5baf_bound_rect(r, br->width, br->height);
	} while (++i != R_INVALID);
	*v = *rects[first];
}

static bool s5k5baf_cmp_rect(const struct v4l2_rect *r1,
			     const struct v4l2_rect *r2)
{
	return !memcmp(r1, r2, sizeof(*r1));
}

static int s5k5baf_set_selection(struct v4l2_subdev *sd,
				 struct v4l2_subdev_pad_config *cfg,
				 struct v4l2_subdev_selection *sel)
{
	static enum selection_rect rtype;
	struct s5k5baf *state = to_s5k5baf(sd);
	struct v4l2_rect **rects;
	int ret = 0;

	rtype = s5k5baf_get_sel_rect(sel->pad, sel->target);
	if (rtype == R_INVALID || s5k5baf_is_bound_target(sel->target))
		return -EINVAL;

	/* allow only scaling on compose */
	if (rtype == R_COMPOSE) {
		sel->r.left = 0;
		sel->r.top = 0;
	}

	if (sel->which == V4L2_SUBDEV_FORMAT_TRY) {
		rects = (struct v4l2_rect * []) {
				&s5k5baf_cis_rect,
				v4l2_subdev_get_try_crop(sd, cfg, PAD_CIS),
				v4l2_subdev_get_try_compose(sd, cfg, PAD_CIS),
				v4l2_subdev_get_try_crop(sd, cfg, PAD_OUT)
			};
		s5k5baf_set_rect_and_adjust(rects, rtype, &sel->r);
		return 0;
	}

	rects = (struct v4l2_rect * []) {
			&s5k5baf_cis_rect,
			&state->crop_sink,
			&state->compose,
			&state->crop_source
		};
	mutex_lock(&state->lock);
	if (state->streaming) {
		/* adjust sel->r to avoid output resolution change */
		if (rtype < R_CROP_SOURCE) {
			if (sel->r.width < state->crop_source.width)
				sel->r.width = state->crop_source.width;
			if (sel->r.height < state->crop_source.height)
				sel->r.height = state->crop_source.height;
		} else {
			sel->r.width = state->crop_source.width;
			sel->r.height = state->crop_source.height;
		}
	}
	s5k5baf_set_rect_and_adjust(rects, rtype, &sel->r);
	if (!s5k5baf_cmp_rect(&state->crop_sink, &s5k5baf_cis_rect) ||
	    !s5k5baf_cmp_rect(&state->compose, &s5k5baf_cis_rect))
		state->apply_crop = 1;
	if (state->streaming)
		ret = s5k5baf_hw_set_crop_rects(state);
	mutex_unlock(&state->lock);

	return ret;
}

static const struct v4l2_subdev_pad_ops s5k5baf_cis_pad_ops = {
	.enum_mbus_code		= s5k5baf_enum_mbus_code,
	.enum_frame_size	= s5k5baf_enum_frame_size,
	.get_fmt		= s5k5baf_get_fmt,
	.set_fmt		= s5k5baf_set_fmt,
};

static const struct v4l2_subdev_pad_ops s5k5baf_pad_ops = {
	.enum_mbus_code		= s5k5baf_enum_mbus_code,
	.enum_frame_size	= s5k5baf_enum_frame_size,
	.enum_frame_interval	= s5k5baf_enum_frame_interval,
	.get_fmt		= s5k5baf_get_fmt,
	.set_fmt		= s5k5baf_set_fmt,
	.get_selection		= s5k5baf_get_selection,
	.set_selection		= s5k5baf_set_selection,
};

static const struct v4l2_subdev_video_ops s5k5baf_video_ops = {
	.g_frame_interval	= s5k5baf_g_frame_interval,
	.s_frame_interval	= s5k5baf_s_frame_interval,
	.s_stream		= s5k5baf_s_stream,
};

/*
 * V4L2 subdev controls
 */

static int s5k5baf_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct v4l2_subdev *sd = ctrl_to_sd(ctrl);
	struct s5k5baf *state = to_s5k5baf(sd);
	int ret;

	v4l2_dbg(1, debug, sd, "ctrl: %s, value: %d\n", ctrl->name, ctrl->val);

	mutex_lock(&state->lock);

	if (state->power == 0)
		goto unlock;

	switch (ctrl->id) {
	case V4L2_CID_AUTO_WHITE_BALANCE:
		s5k5baf_hw_set_awb(state, ctrl->val);
		break;

	case V4L2_CID_BRIGHTNESS:
		s5k5baf_write(state, REG_USER_BRIGHTNESS, ctrl->val);
		break;

	case V4L2_CID_COLORFX:
		s5k5baf_hw_set_colorfx(state, ctrl->val);
		break;

	case V4L2_CID_CONTRAST:
		s5k5baf_write(state, REG_USER_CONTRAST, ctrl->val);
		break;

	case V4L2_CID_EXPOSURE_AUTO:
		s5k5baf_hw_set_auto_exposure(state, ctrl->val);
		break;

	case V4L2_CID_HFLIP:
		s5k5baf_hw_set_mirror(state);
		break;

	case V4L2_CID_POWER_LINE_FREQUENCY:
		s5k5baf_hw_set_anti_flicker(state, ctrl->val);
		break;

	case V4L2_CID_SATURATION:
		s5k5baf_write(state, REG_USER_SATURATION, ctrl->val);
		break;

	case V4L2_CID_SHARPNESS:
		s5k5baf_write(state, REG_USER_SHARPBLUR, ctrl->val);
		break;

	case V4L2_CID_WHITE_BALANCE_TEMPERATURE:
		s5k5baf_write(state, REG_P_COLORTEMP(0), ctrl->val);
		if (state->apply_cfg)
			s5k5baf_hw_sync_cfg(state);
		break;

	case V4L2_CID_TEST_PATTERN:
		s5k5baf_hw_set_test_pattern(state, ctrl->val);
		break;
	}
unlock:
	ret = s5k5baf_clear_error(state);
	mutex_unlock(&state->lock);
	return ret;
}

static const struct v4l2_ctrl_ops s5k5baf_ctrl_ops = {
	.s_ctrl	= s5k5baf_s_ctrl,
};

static const char * const s5k5baf_test_pattern_menu[] = {
	"Disabled",
	"Blank",
	"Bars",
	"Gradients",
	"Textile",
	"Textile2",
	"Squares"
};

static int s5k5baf_initialize_ctrls(struct s5k5baf *state)
{
	const struct v4l2_ctrl_ops *ops = &s5k5baf_ctrl_ops;
	struct s5k5baf_ctrls *ctrls = &state->ctrls;
	struct v4l2_ctrl_handler *hdl = &ctrls->handler;
	int ret;

	ret = v4l2_ctrl_handler_init(hdl, 16);
	if (ret < 0) {
		v4l2_err(&state->sd, "cannot init ctrl handler (%d)\n", ret);
		return ret;
	}

	/* Auto white balance cluster */
	ctrls->awb = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_AUTO_WHITE_BALANCE,
				       0, 1, 1, 1);
	ctrls->gain_red = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_RED_BALANCE,
					    0, 255, 1, S5K5BAF_GAIN_RED_DEF);
	ctrls->gain_blue = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_BLUE_BALANCE,
					     0, 255, 1, S5K5BAF_GAIN_BLUE_DEF);
	v4l2_ctrl_auto_cluster(3, &ctrls->awb, 0, false);

	ctrls->hflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
	ctrls->vflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
	v4l2_ctrl_cluster(2, &ctrls->hflip);

	ctrls->auto_exp = v4l2_ctrl_new_std_menu(hdl, ops,
				V4L2_CID_EXPOSURE_AUTO,
				V4L2_EXPOSURE_MANUAL, 0, V4L2_EXPOSURE_AUTO);
	/* Exposure time: x 1 us */
	ctrls->exposure = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_EXPOSURE,
					    0, 6000000U, 1, 100000U);
	/* Total gain: 256 <=> 1x */
	ctrls->gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAIN,
					0, 256, 1, 256);
	v4l2_ctrl_auto_cluster(3, &ctrls->auto_exp, 0, false);

	v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_POWER_LINE_FREQUENCY,
			       V4L2_CID_POWER_LINE_FREQUENCY_AUTO, 0,
			       V4L2_CID_POWER_LINE_FREQUENCY_AUTO);

	v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_COLORFX,
			       V4L2_COLORFX_SKY_BLUE, ~0x6f, V4L2_COLORFX_NONE);

	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_WHITE_BALANCE_TEMPERATURE,
			  0, 256, 1, 0);

	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_SATURATION, -127, 127, 1, 0);
	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_BRIGHTNESS, -127, 127, 1, 0);
	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_CONTRAST, -127, 127, 1, 0);
	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_SHARPNESS, -127, 127, 1, 0);

	v4l2_ctrl_new_std_menu_items(hdl, ops, V4L2_CID_TEST_PATTERN,
				     ARRAY_SIZE(s5k5baf_test_pattern_menu) - 1,
				     0, 0, s5k5baf_test_pattern_menu);

	if (hdl->error) {
		v4l2_err(&state->sd, "error creating controls (%d)\n",
			 hdl->error);
		ret = hdl->error;
		v4l2_ctrl_handler_free(hdl);
		return ret;
	}

	state->sd.ctrl_handler = hdl;
	return 0;
}

/*
 * V4L2 subdev internal operations
 */
static int s5k5baf_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
	struct v4l2_mbus_framefmt *mf;

	mf = v4l2_subdev_get_try_format(sd, fh->pad, PAD_CIS);
	s5k5baf_try_cis_format(mf);

	if (s5k5baf_is_cis_subdev(sd))
		return 0;

	mf = v4l2_subdev_get_try_format(sd, fh->pad, PAD_OUT);
	mf->colorspace = s5k5baf_formats[0].colorspace;
	mf->code = s5k5baf_formats[0].code;
	mf->width = s5k5baf_cis_rect.width;
	mf->height = s5k5baf_cis_rect.height;
	mf->field = V4L2_FIELD_NONE;

	*v4l2_subdev_get_try_crop(sd, fh->pad, PAD_CIS) = s5k5baf_cis_rect;
	*v4l2_subdev_get_try_compose(sd, fh->pad, PAD_CIS) = s5k5baf_cis_rect;
	*v4l2_subdev_get_try_crop(sd, fh->pad, PAD_OUT) = s5k5baf_cis_rect;

	return 0;
}

static int s5k5baf_check_fw_revision(struct s5k5baf *state)
{
	u16 api_ver = 0, fw_rev = 0, s_id = 0;
	int ret;

	api_ver = s5k5baf_read(state, REG_FW_APIVER);
	fw_rev = s5k5baf_read(state, REG_FW_REVISION) & 0xff;
	s_id = s5k5baf_read(state, REG_FW_SENSOR_ID);
	ret = s5k5baf_clear_error(state);
	if (ret < 0)
		return ret;

	v4l2_info(&state->sd, "FW API=%#x, revision=%#x sensor_id=%#x\n",
		  api_ver, fw_rev, s_id);

	if (api_ver != S5K5BAF_FW_APIVER) {
		v4l2_err(&state->sd, "FW API version not supported\n");
		return -ENODEV;
	}

	return 0;
}

static int s5k5baf_registered(struct v4l2_subdev *sd)
{
	struct s5k5baf *state = to_s5k5baf(sd);
	int ret;

	ret = v4l2_device_register_subdev(sd->v4l2_dev, &state->cis_sd);
	if (ret < 0)
		v4l2_err(sd, "failed to register subdev %s\n",
			 state->cis_sd.name);
	else
		ret = media_create_pad_link(&state->cis_sd.entity, PAD_CIS,
					       &state->sd.entity, PAD_CIS,
					       MEDIA_LNK_FL_IMMUTABLE |
					       MEDIA_LNK_FL_ENABLED);
	return ret;
}

static void s5k5baf_unregistered(struct v4l2_subdev *sd)
{
	struct s5k5baf *state = to_s5k5baf(sd);
	v4l2_device_unregister_subdev(&state->cis_sd);
}

static const struct v4l2_subdev_ops s5k5baf_cis_subdev_ops = {
	.pad	= &s5k5baf_cis_pad_ops,
};

static const struct v4l2_subdev_internal_ops s5k5baf_cis_subdev_internal_ops = {
	.open = s5k5baf_open,
};

static const struct v4l2_subdev_internal_ops s5k5baf_subdev_internal_ops = {
	.registered = s5k5baf_registered,
	.unregistered = s5k5baf_unregistered,
	.open = s5k5baf_open,
};

static const struct v4l2_subdev_core_ops s5k5baf_core_ops = {
	.s_power = s5k5baf_set_power,
	.log_status = v4l2_ctrl_subdev_log_status,
};

static const struct v4l2_subdev_ops s5k5baf_subdev_ops = {
	.core = &s5k5baf_core_ops,
	.pad = &s5k5baf_pad_ops,
	.video = &s5k5baf_video_ops,
};

static int s5k5baf_configure_gpios(struct s5k5baf *state)
{
	static const char * const name[] = { "S5K5BAF_STBY", "S5K5BAF_RST" };
	struct i2c_client *c = v4l2_get_subdevdata(&state->sd);
	struct s5k5baf_gpio *g = state->gpios;
	int ret, i;

	for (i = 0; i < NUM_GPIOS; ++i) {
		int flags = GPIOF_DIR_OUT;
		if (g[i].level)
			flags |= GPIOF_INIT_HIGH;
		ret = devm_gpio_request_one(&c->dev, g[i].gpio, flags, name[i]);
		if (ret < 0) {
			v4l2_err(c, "failed to request gpio %s\n", name[i]);
			return ret;
		}
	}
	return 0;
}

static int s5k5baf_parse_gpios(struct s5k5baf_gpio *gpios, struct device *dev)
{
	static const char * const names[] = {
		"stbyn-gpios",
		"rstn-gpios",
	};
	struct device_node *node = dev->of_node;
	enum of_gpio_flags flags;
	int ret, i;

	for (i = 0; i < NUM_GPIOS; ++i) {
		ret = of_get_named_gpio_flags(node, names[i], 0, &flags);
		if (ret < 0) {
			dev_err(dev, "no %s GPIO pin provided\n", names[i]);
			return ret;
		}
		gpios[i].gpio = ret;
		gpios[i].level = !(flags & OF_GPIO_ACTIVE_LOW);
	}

	return 0;
}

static int s5k5baf_parse_device_node(struct s5k5baf *state, struct device *dev)
{
	struct device_node *node = dev->of_node;
	struct device_node *node_ep;
	struct v4l2_fwnode_endpoint ep;
	int ret;

	if (!node) {
		dev_err(dev, "no device-tree node provided\n");
		return -EINVAL;
	}

	ret = of_property_read_u32(node, "clock-frequency",
				   &state->mclk_frequency);
	if (ret < 0) {
		state->mclk_frequency = S5K5BAF_DEFAULT_MCLK_FREQ;
		dev_info(dev, "using default %u Hz clock frequency\n",
			 state->mclk_frequency);
	}

	ret = s5k5baf_parse_gpios(state->gpios, dev);
	if (ret < 0)
		return ret;

	node_ep = of_graph_get_next_endpoint(node, NULL);
	if (!node_ep) {
		dev_err(dev, "no endpoint defined at node %pOF\n", node);
		return -EINVAL;
	}

	ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(node_ep), &ep);
	of_node_put(node_ep);
	if (ret)
		return ret;

	state->bus_type = ep.bus_type;

	switch (state->bus_type) {
	case V4L2_MBUS_CSI2:
		state->nlanes = ep.bus.mipi_csi2.num_data_lanes;
		break;
	case V4L2_MBUS_PARALLEL:
		break;
	default:
		dev_err(dev, "unsupported bus in endpoint defined at node %pOF\n",
			node);
		return -EINVAL;
	}

	return 0;
}

static int s5k5baf_configure_subdevs(struct s5k5baf *state,
				     struct i2c_client *c)
{
	struct v4l2_subdev *sd;
	int ret;

	sd = &state->cis_sd;
	v4l2_subdev_init(sd, &s5k5baf_cis_subdev_ops);
	sd->owner = THIS_MODULE;
	v4l2_set_subdevdata(sd, state);
	snprintf(sd->name, sizeof(sd->name), "S5K5BAF-CIS %d-%04x",
		 i2c_adapter_id(c->adapter), c->addr);

	sd->internal_ops = &s5k5baf_cis_subdev_internal_ops;
	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;

	state->cis_pad.flags = MEDIA_PAD_FL_SOURCE;
	sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
	ret = media_entity_pads_init(&sd->entity, NUM_CIS_PADS, &state->cis_pad);
	if (ret < 0)
		goto err;

	sd = &state->sd;
	v4l2_i2c_subdev_init(sd, c, &s5k5baf_subdev_ops);
	snprintf(sd->name, sizeof(sd->name), "S5K5BAF-ISP %d-%04x",
		 i2c_adapter_id(c->adapter), c->addr);

	sd->internal_ops = &s5k5baf_subdev_internal_ops;
	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;

	state->pads[PAD_CIS].flags = MEDIA_PAD_FL_SINK;
	state->pads[PAD_OUT].flags = MEDIA_PAD_FL_SOURCE;
	sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
	ret = media_entity_pads_init(&sd->entity, NUM_ISP_PADS, state->pads);

	if (!ret)
		return 0;

	media_entity_cleanup(&state->cis_sd.entity);
err:
	dev_err(&c->dev, "cannot init media entity %s\n", sd->name);
	return ret;
}

static int s5k5baf_configure_regulators(struct s5k5baf *state)
{
	struct i2c_client *c = v4l2_get_subdevdata(&state->sd);
	int ret;
	int i;

	for (i = 0; i < S5K5BAF_NUM_SUPPLIES; i++)
		state->supplies[i].supply = s5k5baf_supply_names[i];

	ret = devm_regulator_bulk_get(&c->dev, S5K5BAF_NUM_SUPPLIES,
				      state->supplies);
	if (ret < 0)
		v4l2_err(c, "failed to get regulators\n");
	return ret;
}

static int s5k5baf_probe(struct i2c_client *c,
			const struct i2c_device_id *id)
{
	struct s5k5baf *state;
	int ret;

	state = devm_kzalloc(&c->dev, sizeof(*state), GFP_KERNEL);
	if (!state)
		return -ENOMEM;

	mutex_init(&state->lock);
	state->crop_sink = s5k5baf_cis_rect;
	state->compose = s5k5baf_cis_rect;
	state->crop_source = s5k5baf_cis_rect;

	ret = s5k5baf_parse_device_node(state, &c->dev);
	if (ret < 0)
		return ret;

	ret = s5k5baf_configure_subdevs(state, c);
	if (ret < 0)
		return ret;

	ret = s5k5baf_configure_gpios(state);
	if (ret < 0)
		goto err_me;

	ret = s5k5baf_configure_regulators(state);
	if (ret < 0)
		goto err_me;

	state->clock = devm_clk_get(state->sd.dev, S5K5BAF_CLK_NAME);
	if (IS_ERR(state->clock)) {
		ret = -EPROBE_DEFER;
		goto err_me;
	}

	ret = s5k5baf_power_on(state);
	if (ret < 0) {
		ret = -EPROBE_DEFER;
		goto err_me;
	}
	s5k5baf_hw_init(state);
	ret = s5k5baf_check_fw_revision(state);

	s5k5baf_power_off(state);
	if (ret < 0)
		goto err_me;

	ret = s5k5baf_initialize_ctrls(state);
	if (ret < 0)
		goto err_me;

	ret = v4l2_async_register_subdev(&state->sd);
	if (ret < 0)
		goto err_ctrl;

	return 0;

err_ctrl:
	v4l2_ctrl_handler_free(state->sd.ctrl_handler);
err_me:
	media_entity_cleanup(&state->sd.entity);
	media_entity_cleanup(&state->cis_sd.entity);
	return ret;
}

static int s5k5baf_remove(struct i2c_client *c)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(c);
	struct s5k5baf *state = to_s5k5baf(sd);

	v4l2_async_unregister_subdev(sd);
	v4l2_ctrl_handler_free(sd->ctrl_handler);
	media_entity_cleanup(&sd->entity);

	sd = &state->cis_sd;
	v4l2_device_unregister_subdev(sd);
	media_entity_cleanup(&sd->entity);

	return 0;
}

static const struct i2c_device_id s5k5baf_id[] = {
	{ S5K5BAF_DRIVER_NAME, 0 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, s5k5baf_id);

static const struct of_device_id s5k5baf_of_match[] = {
	{ .compatible = "samsung,s5k5baf" },
	{ }
};
MODULE_DEVICE_TABLE(of, s5k5baf_of_match);

static struct i2c_driver s5k5baf_i2c_driver = {
	.driver = {
		.of_match_table = s5k5baf_of_match,
		.name = S5K5BAF_DRIVER_NAME
	},
	.probe		= s5k5baf_probe,
	.remove		= s5k5baf_remove,
	.id_table	= s5k5baf_id,
};

module_i2c_driver(s5k5baf_i2c_driver);

MODULE_DESCRIPTION("Samsung S5K5BAF(X) UXGA camera driver");
MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
MODULE_LICENSE("GPL v2");