aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/usb/s2255/s2255drv.c
blob: 498c57ea5d32c2c0176aea4ca0f429a2eded85b6 (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
/*
 *  s2255drv.c - a driver for the Sensoray 2255 USB video capture device
 *
 *   Copyright (C) 2007-2010 by Sensoray Company Inc.
 *                              Dean Anderson
 *
 * Some video buffer code based on vivi driver:
 *
 * Sensoray 2255 device supports 4 simultaneous channels.
 * The channels are not "crossbar" inputs, they are physically
 * attached to separate video decoders.
 *
 * Because of USB2.0 bandwidth limitations. There is only a
 * certain amount of data which may be transferred at one time.
 *
 * Example maximum bandwidth utilization:
 *
 * -full size, color mode YUYV or YUV422P: 2 channels at once
 * -full or half size Grey scale: all 4 channels at once
 * -half size, color mode YUYV or YUV422P: all 4 channels at once
 * -full size, color mode YUYV or YUV422P 1/2 frame rate: all 4 channels
 *  at once.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/firmware.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/mm.h>
#include <media/videobuf-vmalloc.h>
#include <media/v4l2-common.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <linux/vmalloc.h>
#include <linux/usb.h>

#define S2255_VERSION		"1.22.1"
#define FIRMWARE_FILE_NAME "f2255usb.bin"

/* default JPEG quality */
#define S2255_DEF_JPEG_QUAL     50
/* vendor request in */
#define S2255_VR_IN		0
/* vendor request out */
#define S2255_VR_OUT		1
/* firmware query */
#define S2255_VR_FW		0x30
/* USB endpoint number for configuring the device */
#define S2255_CONFIG_EP         2
/* maximum time for DSP to start responding after last FW word loaded(ms) */
#define S2255_DSP_BOOTTIME      800
/* maximum time to wait for firmware to load (ms) */
#define S2255_LOAD_TIMEOUT      (5000 + S2255_DSP_BOOTTIME)
#define S2255_DEF_BUFS          16
#define S2255_SETMODE_TIMEOUT   500
#define S2255_VIDSTATUS_TIMEOUT 350
#define S2255_MARKER_FRAME	cpu_to_le32(0x2255DA4AL)
#define S2255_MARKER_RESPONSE	cpu_to_le32(0x2255ACACL)
#define S2255_RESPONSE_SETMODE  cpu_to_le32(0x01)
#define S2255_RESPONSE_FW       cpu_to_le32(0x10)
#define S2255_RESPONSE_STATUS   cpu_to_le32(0x20)
#define S2255_USB_XFER_SIZE	(16 * 1024)
#define MAX_CHANNELS		4
#define SYS_FRAMES		4
/* maximum size is PAL full size plus room for the marker header(s) */
#define SYS_FRAMES_MAXSIZE	(720*288*2*2 + 4096)
#define DEF_USB_BLOCK		S2255_USB_XFER_SIZE
#define LINE_SZ_4CIFS_NTSC	640
#define LINE_SZ_2CIFS_NTSC	640
#define LINE_SZ_1CIFS_NTSC	320
#define LINE_SZ_4CIFS_PAL	704
#define LINE_SZ_2CIFS_PAL	704
#define LINE_SZ_1CIFS_PAL	352
#define NUM_LINES_4CIFS_NTSC	240
#define NUM_LINES_2CIFS_NTSC	240
#define NUM_LINES_1CIFS_NTSC	240
#define NUM_LINES_4CIFS_PAL	288
#define NUM_LINES_2CIFS_PAL	288
#define NUM_LINES_1CIFS_PAL	288
#define LINE_SZ_DEF		640
#define NUM_LINES_DEF		240


/* predefined settings */
#define FORMAT_NTSC	1
#define FORMAT_PAL	2

#define SCALE_4CIFS	1	/* 640x480(NTSC) or 704x576(PAL) */
#define SCALE_2CIFS	2	/* 640x240(NTSC) or 704x288(PAL) */
#define SCALE_1CIFS	3	/* 320x240(NTSC) or 352x288(PAL) */
/* SCALE_4CIFSI is the 2 fields interpolated into one */
#define SCALE_4CIFSI	4	/* 640x480(NTSC) or 704x576(PAL) high quality */

#define COLOR_YUVPL	1	/* YUV planar */
#define COLOR_YUVPK	2	/* YUV packed */
#define COLOR_Y8	4	/* monochrome */
#define COLOR_JPG       5       /* JPEG */

#define MASK_COLOR       0x000000ff
#define MASK_JPG_QUALITY 0x0000ff00
#define MASK_INPUT_TYPE  0x000f0000
/* frame decimation. */
#define FDEC_1		1	/* capture every frame. default */
#define FDEC_2		2	/* capture every 2nd frame */
#define FDEC_3		3	/* capture every 3rd frame */
#define FDEC_5		5	/* capture every 5th frame */

/*-------------------------------------------------------
 * Default mode parameters.
 *-------------------------------------------------------*/
#define DEF_SCALE	SCALE_4CIFS
#define DEF_COLOR	COLOR_YUVPL
#define DEF_FDEC	FDEC_1
#define DEF_BRIGHT	0
#define DEF_CONTRAST	0x5c
#define DEF_SATURATION	0x80
#define DEF_HUE		0

/* usb config commands */
#define IN_DATA_TOKEN	cpu_to_le32(0x2255c0de)
#define CMD_2255	0xc2255000
#define CMD_SET_MODE	cpu_to_le32((CMD_2255 | 0x10))
#define CMD_START	cpu_to_le32((CMD_2255 | 0x20))
#define CMD_STOP	cpu_to_le32((CMD_2255 | 0x30))
#define CMD_STATUS	cpu_to_le32((CMD_2255 | 0x40))

struct s2255_mode {
	u32 format;	/* input video format (NTSC, PAL) */
	u32 scale;	/* output video scale */
	u32 color;	/* output video color format */
	u32 fdec;	/* frame decimation */
	u32 bright;	/* brightness */
	u32 contrast;	/* contrast */
	u32 saturation;	/* saturation */
	u32 hue;	/* hue (NTSC only)*/
	u32 single;	/* capture 1 frame at a time (!=0), continuously (==0)*/
	u32 usb_block;	/* block size. should be 4096 of DEF_USB_BLOCK */
	u32 restart;	/* if DSP requires restart */
};


#define S2255_READ_IDLE		0
#define S2255_READ_FRAME	1

/* frame structure */
struct s2255_framei {
	unsigned long size;
	unsigned long ulState;	/* ulState:S2255_READ_IDLE, S2255_READ_FRAME*/
	void *lpvbits;		/* image data */
	unsigned long cur_size;	/* current data copied to it */
};

/* image buffer structure */
struct s2255_bufferi {
	unsigned long dwFrames;			/* number of frames in buffer */
	struct s2255_framei frame[SYS_FRAMES];	/* array of FRAME structures */
};

#define DEF_MODEI_NTSC_CONT	{FORMAT_NTSC, DEF_SCALE, DEF_COLOR,	\
			DEF_FDEC, DEF_BRIGHT, DEF_CONTRAST, DEF_SATURATION, \
			DEF_HUE, 0, DEF_USB_BLOCK, 0}

struct s2255_dmaqueue {
	struct list_head	active;
	struct s2255_dev	*dev;
};

/* for firmware loading, fw_state */
#define S2255_FW_NOTLOADED	0
#define S2255_FW_LOADED_DSPWAIT	1
#define S2255_FW_SUCCESS	2
#define S2255_FW_FAILED		3
#define S2255_FW_DISCONNECTING  4
#define S2255_FW_MARKER		cpu_to_le32(0x22552f2f)
/* 2255 read states */
#define S2255_READ_IDLE         0
#define S2255_READ_FRAME        1
struct s2255_fw {
	int		      fw_loaded;
	int		      fw_size;
	struct urb	      *fw_urb;
	atomic_t	      fw_state;
	void		      *pfw_data;
	wait_queue_head_t     wait_fw;
	const struct firmware *fw;
};

struct s2255_pipeinfo {
	u32 max_transfer_size;
	u32 cur_transfer_size;
	u8 *transfer_buffer;
	u32 state;
	void *stream_urb;
	void *dev;	/* back pointer to s2255_dev struct*/
	u32 err_count;
	u32 idx;
};

struct s2255_fmt; /*forward declaration */
struct s2255_dev;

struct s2255_channel {
	struct video_device	vdev;
	int			resources;
	struct s2255_dmaqueue	vidq;
	struct s2255_bufferi	buffer;
	struct s2255_mode	mode;
	/* jpeg compression */
	struct v4l2_jpegcompression jc;
	/* capture parameters (for high quality mode full size) */
	struct v4l2_captureparm cap_parm;
	int			cur_frame;
	int			last_frame;

	int			b_acquire;
	/* allocated image size */
	unsigned long		req_image_size;
	/* received packet size */
	unsigned long		pkt_size;
	int			bad_payload;
	unsigned long		frame_count;
	/* if JPEG image */
	int                     jpg_size;
	/* if channel configured to default state */
	int                     configured;
	wait_queue_head_t       wait_setmode;
	int                     setmode_ready;
	/* video status items */
	int                     vidstatus;
	wait_queue_head_t       wait_vidstatus;
	int                     vidstatus_ready;
	unsigned int		width;
	unsigned int		height;
	const struct s2255_fmt	*fmt;
	int idx; /* channel number on device, 0-3 */
};


struct s2255_dev {
	struct s2255_channel    channel[MAX_CHANNELS];
	struct v4l2_device 	v4l2_dev;
	atomic_t                num_channels;
	int			frames;
	struct mutex		lock;	/* channels[].vdev.lock */
	struct usb_device	*udev;
	struct usb_interface	*interface;
	u8			read_endpoint;
	struct timer_list	timer;
	struct s2255_fw	*fw_data;
	struct s2255_pipeinfo	pipe;
	u32			cc;	/* current channel */
	int			frame_ready;
	int                     chn_ready;
	spinlock_t              slock;
	/* dsp firmware version (f2255usb.bin) */
	int                     dsp_fw_ver;
	u16                     pid; /* product id */
};

static inline struct s2255_dev *to_s2255_dev(struct v4l2_device *v4l2_dev)
{
	return container_of(v4l2_dev, struct s2255_dev, v4l2_dev);
}

struct s2255_fmt {
	char *name;
	u32 fourcc;
	int depth;
};

/* buffer for one video frame */
struct s2255_buffer {
	/* common v4l buffer stuff -- must be first */
	struct videobuf_buffer vb;
	const struct s2255_fmt *fmt;
};

struct s2255_fh {
	struct s2255_dev	*dev;
	struct videobuf_queue	vb_vidq;
	enum v4l2_buf_type	type;
	struct s2255_channel	*channel;
	int			resources;
};

/* current cypress EEPROM firmware version */
#define S2255_CUR_USB_FWVER	((3 << 8) | 12)
/* current DSP FW version */
#define S2255_CUR_DSP_FWVER     10104
/* Need DSP version 5+ for video status feature */
#define S2255_MIN_DSP_STATUS      5
#define S2255_MIN_DSP_COLORFILTER 8
#define S2255_NORMS		(V4L2_STD_PAL | V4L2_STD_NTSC)

/* private V4L2 controls */

/*
 * The following chart displays how COLORFILTER should be set
 *  =========================================================
 *  =     fourcc              =     COLORFILTER             =
 *  =                         ===============================
 *  =                         =   0             =    1      =
 *  =========================================================
 *  =  V4L2_PIX_FMT_GREY(Y8)  = monochrome from = monochrome=
 *  =                         = s-video or      = composite =
 *  =                         = B/W camera      = input     =
 *  =========================================================
 *  =    other                = color, svideo   = color,    =
 *  =                         =                 = composite =
 *  =========================================================
 *
 * Notes:
 *   channels 0-3 on 2255 are composite
 *   channels 0-1 on 2257 are composite, 2-3 are s-video
 * If COLORFILTER is 0 with a composite color camera connected,
 * the output will appear monochrome but hatching
 * will occur.
 * COLORFILTER is different from "color killer" and "color effects"
 * for reasons above.
 */
#define S2255_V4L2_YC_ON  1
#define S2255_V4L2_YC_OFF 0
#define V4L2_CID_PRIVATE_COLORFILTER (V4L2_CID_PRIVATE_BASE + 0)

/* frame prefix size (sent once every frame) */
#define PREFIX_SIZE		512

/* Channels on box are in reverse order */
static unsigned long G_chnmap[MAX_CHANNELS] = {3, 2, 1, 0};

static int debug;
static int *s2255_debug = &debug;

static int s2255_start_readpipe(struct s2255_dev *dev);
static void s2255_stop_readpipe(struct s2255_dev *dev);
static int s2255_start_acquire(struct s2255_channel *channel);
static int s2255_stop_acquire(struct s2255_channel *channel);
static void s2255_fillbuff(struct s2255_channel *chn, struct s2255_buffer *buf,
			   int jpgsize);
static int s2255_set_mode(struct s2255_channel *chan, struct s2255_mode *mode);
static int s2255_board_shutdown(struct s2255_dev *dev);
static void s2255_fwload_start(struct s2255_dev *dev, int reset);
static void s2255_destroy(struct s2255_dev *dev);
static long s2255_vendor_req(struct s2255_dev *dev, unsigned char req,
			     u16 index, u16 value, void *buf,
			     s32 buf_len, int bOut);

/* dev_err macro with driver name */
#define S2255_DRIVER_NAME "s2255"
#define s2255_dev_err(dev, fmt, arg...)					\
		dev_err(dev, S2255_DRIVER_NAME " - " fmt, ##arg)

#define dprintk(level, fmt, arg...)					\
	do {								\
		if (*s2255_debug >= (level)) {				\
			printk(KERN_DEBUG S2255_DRIVER_NAME		\
				": " fmt, ##arg);			\
		}							\
	} while (0)

static struct usb_driver s2255_driver;

/* Declare static vars that will be used as parameters */
static unsigned int vid_limit = 16;	/* Video memory limit, in Mb */

/* start video number */
static int video_nr = -1;	/* /dev/videoN, -1 for autodetect */

/* Enable jpeg capture. */
static int jpeg_enable = 1;

module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Debug level(0-100) default 0");
module_param(vid_limit, int, 0644);
MODULE_PARM_DESC(vid_limit, "video memory limit(Mb)");
module_param(video_nr, int, 0644);
MODULE_PARM_DESC(video_nr, "start video minor(-1 default autodetect)");
module_param(jpeg_enable, int, 0644);
MODULE_PARM_DESC(jpeg_enable, "Jpeg enable(1-on 0-off) default 1");

/* USB device table */
#define USB_SENSORAY_VID	0x1943
static struct usb_device_id s2255_table[] = {
	{USB_DEVICE(USB_SENSORAY_VID, 0x2255)},
	{USB_DEVICE(USB_SENSORAY_VID, 0x2257)}, /*same family as 2255*/
	{ }			/* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, s2255_table);

#define BUFFER_TIMEOUT msecs_to_jiffies(400)

/* image formats.  */
/* JPEG formats must be defined last to support jpeg_enable parameter */
static const struct s2255_fmt formats[] = {
	{
		.name = "4:2:2, planar, YUV422P",
		.fourcc = V4L2_PIX_FMT_YUV422P,
		.depth = 16

	}, {
		.name = "4:2:2, packed, YUYV",
		.fourcc = V4L2_PIX_FMT_YUYV,
		.depth = 16

	}, {
		.name = "4:2:2, packed, UYVY",
		.fourcc = V4L2_PIX_FMT_UYVY,
		.depth = 16
	}, {
		.name = "8bpp GREY",
		.fourcc = V4L2_PIX_FMT_GREY,
		.depth = 8
	}, {
		.name = "JPG",
		.fourcc = V4L2_PIX_FMT_JPEG,
		.depth = 24
	}, {
		.name = "MJPG",
		.fourcc = V4L2_PIX_FMT_MJPEG,
		.depth = 24
	}
};

static int norm_maxw(struct video_device *vdev)
{
	return (vdev->current_norm & V4L2_STD_NTSC) ?
	    LINE_SZ_4CIFS_NTSC : LINE_SZ_4CIFS_PAL;
}

static int norm_maxh(struct video_device *vdev)
{
	return (vdev->current_norm & V4L2_STD_NTSC) ?
	    (NUM_LINES_1CIFS_NTSC * 2) : (NUM_LINES_1CIFS_PAL * 2);
}

static int norm_minw(struct video_device *vdev)
{
	return (vdev->current_norm & V4L2_STD_NTSC) ?
	    LINE_SZ_1CIFS_NTSC : LINE_SZ_1CIFS_PAL;
}

static int norm_minh(struct video_device *vdev)
{
	return (vdev->current_norm & V4L2_STD_NTSC) ?
	    (NUM_LINES_1CIFS_NTSC) : (NUM_LINES_1CIFS_PAL);
}


/*
 * TODO: fixme: move YUV reordering to hardware
 * converts 2255 planar format to yuyv or uyvy
 */
static void planar422p_to_yuv_packed(const unsigned char *in,
				     unsigned char *out,
				     int width, int height,
				     int fmt)
{
	unsigned char *pY;
	unsigned char *pCb;
	unsigned char *pCr;
	unsigned long size = height * width;
	unsigned int i;
	pY = (unsigned char *)in;
	pCr = (unsigned char *)in + height * width;
	pCb = (unsigned char *)in + height * width + (height * width / 2);
	for (i = 0; i < size * 2; i += 4) {
		out[i] = (fmt == V4L2_PIX_FMT_YUYV) ? *pY++ : *pCr++;
		out[i + 1] = (fmt == V4L2_PIX_FMT_YUYV) ? *pCr++ : *pY++;
		out[i + 2] = (fmt == V4L2_PIX_FMT_YUYV) ? *pY++ : *pCb++;
		out[i + 3] = (fmt == V4L2_PIX_FMT_YUYV) ? *pCb++ : *pY++;
	}
	return;
}

static void s2255_reset_dsppower(struct s2255_dev *dev)
{
	s2255_vendor_req(dev, 0x40, 0x0000, 0x0001, NULL, 0, 1);
	msleep(10);
	s2255_vendor_req(dev, 0x50, 0x0000, 0x0000, NULL, 0, 1);
	msleep(600);
	s2255_vendor_req(dev, 0x10, 0x0000, 0x0000, NULL, 0, 1);
	return;
}

/* kickstarts the firmware loading. from probe
 */
static void s2255_timer(unsigned long user_data)
{
	struct s2255_fw *data = (struct s2255_fw *)user_data;
	dprintk(100, "%s\n", __func__);
	if (usb_submit_urb(data->fw_urb, GFP_ATOMIC) < 0) {
		printk(KERN_ERR "s2255: can't submit urb\n");
		atomic_set(&data->fw_state, S2255_FW_FAILED);
		/* wake up anything waiting for the firmware */
		wake_up(&data->wait_fw);
		return;
	}
}


/* this loads the firmware asynchronously.
   Originally this was done synchroously in probe.
   But it is better to load it asynchronously here than block
   inside the probe function. Blocking inside probe affects boot time.
   FW loading is triggered by the timer in the probe function
*/
static void s2255_fwchunk_complete(struct urb *urb)
{
	struct s2255_fw *data = urb->context;
	struct usb_device *udev = urb->dev;
	int len;
	dprintk(100, "%s: udev %p urb %p", __func__, udev, urb);
	if (urb->status) {
		dev_err(&udev->dev, "URB failed with status %d\n", urb->status);
		atomic_set(&data->fw_state, S2255_FW_FAILED);
		/* wake up anything waiting for the firmware */
		wake_up(&data->wait_fw);
		return;
	}
	if (data->fw_urb == NULL) {
		s2255_dev_err(&udev->dev, "disconnected\n");
		atomic_set(&data->fw_state, S2255_FW_FAILED);
		/* wake up anything waiting for the firmware */
		wake_up(&data->wait_fw);
		return;
	}
#define CHUNK_SIZE 512
	/* all USB transfers must be done with continuous kernel memory.
	   can't allocate more than 128k in current linux kernel, so
	   upload the firmware in chunks
	 */
	if (data->fw_loaded < data->fw_size) {
		len = (data->fw_loaded + CHUNK_SIZE) > data->fw_size ?
		    data->fw_size % CHUNK_SIZE : CHUNK_SIZE;

		if (len < CHUNK_SIZE)
			memset(data->pfw_data, 0, CHUNK_SIZE);

		dprintk(100, "completed len %d, loaded %d \n", len,
			data->fw_loaded);

		memcpy(data->pfw_data,
		       (char *) data->fw->data + data->fw_loaded, len);

		usb_fill_bulk_urb(data->fw_urb, udev, usb_sndbulkpipe(udev, 2),
				  data->pfw_data, CHUNK_SIZE,
				  s2255_fwchunk_complete, data);
		if (usb_submit_urb(data->fw_urb, GFP_ATOMIC) < 0) {
			dev_err(&udev->dev, "failed submit URB\n");
			atomic_set(&data->fw_state, S2255_FW_FAILED);
			/* wake up anything waiting for the firmware */
			wake_up(&data->wait_fw);
			return;
		}
		data->fw_loaded += len;
	} else {
		atomic_set(&data->fw_state, S2255_FW_LOADED_DSPWAIT);
		dprintk(100, "%s: firmware upload complete\n", __func__);
	}
	return;

}

static int s2255_got_frame(struct s2255_channel *channel, int jpgsize)
{
	struct s2255_dmaqueue *dma_q = &channel->vidq;
	struct s2255_buffer *buf;
	struct s2255_dev *dev = to_s2255_dev(channel->vdev.v4l2_dev);
	unsigned long flags = 0;
	int rc = 0;
	spin_lock_irqsave(&dev->slock, flags);
	if (list_empty(&dma_q->active)) {
		dprintk(1, "No active queue to serve\n");
		rc = -1;
		goto unlock;
	}
	buf = list_entry(dma_q->active.next,
			 struct s2255_buffer, vb.queue);
	list_del(&buf->vb.queue);
	v4l2_get_timestamp(&buf->vb.ts);
	s2255_fillbuff(channel, buf, jpgsize);
	wake_up(&buf->vb.done);
	dprintk(2, "%s: [buf/i] [%p/%d]\n", __func__, buf, buf->vb.i);
unlock:
	spin_unlock_irqrestore(&dev->slock, flags);
	return rc;
}

static const struct s2255_fmt *format_by_fourcc(int fourcc)
{
	unsigned int i;
	for (i = 0; i < ARRAY_SIZE(formats); i++) {
		if (-1 == formats[i].fourcc)
			continue;
	if (!jpeg_enable && ((formats[i].fourcc == V4L2_PIX_FMT_JPEG) ||
			     (formats[i].fourcc == V4L2_PIX_FMT_MJPEG)))
	    continue;
		if (formats[i].fourcc == fourcc)
			return formats + i;
	}
	return NULL;
}

/* video buffer vmalloc implementation based partly on VIVI driver which is
 *          Copyright (c) 2006 by
 *                  Mauro Carvalho Chehab <mchehab--a.t--infradead.org>
 *                  Ted Walther <ted--a.t--enumera.com>
 *                  John Sokol <sokol--a.t--videotechnology.com>
 *                  http://v4l.videotechnology.com/
 *
 */
static void s2255_fillbuff(struct s2255_channel *channel,
			   struct s2255_buffer *buf, int jpgsize)
{
	int pos = 0;
	const char *tmpbuf;
	char *vbuf = videobuf_to_vmalloc(&buf->vb);
	unsigned long last_frame;

	if (!vbuf)
		return;
	last_frame = channel->last_frame;
	if (last_frame != -1) {
		tmpbuf =
		    (const char *)channel->buffer.frame[last_frame].lpvbits;
		switch (buf->fmt->fourcc) {
		case V4L2_PIX_FMT_YUYV:
		case V4L2_PIX_FMT_UYVY:
			planar422p_to_yuv_packed((const unsigned char *)tmpbuf,
						 vbuf, buf->vb.width,
						 buf->vb.height,
						 buf->fmt->fourcc);
			break;
		case V4L2_PIX_FMT_GREY:
			memcpy(vbuf, tmpbuf, buf->vb.width * buf->vb.height);
			break;
		case V4L2_PIX_FMT_JPEG:
		case V4L2_PIX_FMT_MJPEG:
			buf->vb.size = jpgsize;
			memcpy(vbuf, tmpbuf, buf->vb.size);
			break;
		case V4L2_PIX_FMT_YUV422P:
			memcpy(vbuf, tmpbuf,
			       buf->vb.width * buf->vb.height * 2);
			break;
		default:
			printk(KERN_DEBUG "s2255: unknown format?\n");
		}
		channel->last_frame = -1;
	} else {
		printk(KERN_ERR "s2255: =======no frame\n");
		return;

	}
	dprintk(2, "s2255fill at : Buffer 0x%08lx size= %d\n",
		(unsigned long)vbuf, pos);
	/* tell v4l buffer was filled */

	buf->vb.field_count = channel->frame_count * 2;
	v4l2_get_timestamp(&buf->vb.ts);
	buf->vb.state = VIDEOBUF_DONE;
}


/* ------------------------------------------------------------------
   Videobuf operations
   ------------------------------------------------------------------*/

static int buffer_setup(struct videobuf_queue *vq, unsigned int *count,
			unsigned int *size)
{
	struct s2255_fh *fh = vq->priv_data;
	struct s2255_channel *channel = fh->channel;
	*size = channel->width * channel->height * (channel->fmt->depth >> 3);

	if (0 == *count)
		*count = S2255_DEF_BUFS;

	if (*size * *count > vid_limit * 1024 * 1024)
		*count = (vid_limit * 1024 * 1024) / *size;

	return 0;
}

static void free_buffer(struct videobuf_queue *vq, struct s2255_buffer *buf)
{
	dprintk(4, "%s\n", __func__);

	videobuf_vmalloc_free(&buf->vb);
	buf->vb.state = VIDEOBUF_NEEDS_INIT;
}

static int buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
			  enum v4l2_field field)
{
	struct s2255_fh *fh = vq->priv_data;
	struct s2255_channel *channel = fh->channel;
	struct s2255_buffer *buf = container_of(vb, struct s2255_buffer, vb);
	int rc;
	int w = channel->width;
	int h = channel->height;
	dprintk(4, "%s, field=%d\n", __func__, field);
	if (channel->fmt == NULL)
		return -EINVAL;

	if ((w < norm_minw(&channel->vdev)) ||
	    (w > norm_maxw(&channel->vdev)) ||
	    (h < norm_minh(&channel->vdev)) ||
	    (h > norm_maxh(&channel->vdev))) {
		dprintk(4, "invalid buffer prepare\n");
		return -EINVAL;
	}
	buf->vb.size = w * h * (channel->fmt->depth >> 3);
	if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size) {
		dprintk(4, "invalid buffer prepare\n");
		return -EINVAL;
	}

	buf->fmt = channel->fmt;
	buf->vb.width = w;
	buf->vb.height = h;
	buf->vb.field = field;

	if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
		rc = videobuf_iolock(vq, &buf->vb, NULL);
		if (rc < 0)
			goto fail;
	}

	buf->vb.state = VIDEOBUF_PREPARED;
	return 0;
fail:
	free_buffer(vq, buf);
	return rc;
}

static void buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
{
	struct s2255_buffer *buf = container_of(vb, struct s2255_buffer, vb);
	struct s2255_fh *fh = vq->priv_data;
	struct s2255_channel *channel = fh->channel;
	struct s2255_dmaqueue *vidq = &channel->vidq;
	dprintk(1, "%s\n", __func__);
	buf->vb.state = VIDEOBUF_QUEUED;
	list_add_tail(&buf->vb.queue, &vidq->active);
}

static void buffer_release(struct videobuf_queue *vq,
			   struct videobuf_buffer *vb)
{
	struct s2255_buffer *buf = container_of(vb, struct s2255_buffer, vb);
	struct s2255_fh *fh = vq->priv_data;
	dprintk(4, "%s %d\n", __func__, fh->channel->idx);
	free_buffer(vq, buf);
}

static struct videobuf_queue_ops s2255_video_qops = {
	.buf_setup = buffer_setup,
	.buf_prepare = buffer_prepare,
	.buf_queue = buffer_queue,
	.buf_release = buffer_release,
};


static int res_get(struct s2255_fh *fh)
{
	struct s2255_channel *channel = fh->channel;
	/* is it free? */
	if (channel->resources)
		return 0; /* no, someone else uses it */
	/* it's free, grab it */
	channel->resources = 1;
	fh->resources = 1;
	dprintk(1, "s2255: res: get\n");
	return 1;
}

static int res_locked(struct s2255_fh *fh)
{
	return fh->channel->resources;
}

static int res_check(struct s2255_fh *fh)
{
	return fh->resources;
}


static void res_free(struct s2255_fh *fh)
{
	struct s2255_channel *channel = fh->channel;
	channel->resources = 0;
	fh->resources = 0;
	dprintk(1, "res: put\n");
}

static int vidioc_querymenu(struct file *file, void *priv,
			    struct v4l2_querymenu *qmenu)
{
	static const char *colorfilter[] = {
		"Off",
		"On",
		NULL
	};
	if (qmenu->id == V4L2_CID_PRIVATE_COLORFILTER) {
		int i;
		const char **menu_items = colorfilter;
		for (i = 0; i < qmenu->index && menu_items[i]; i++)
			; /* do nothing (from v4l2-common.c) */
		if (menu_items[i] == NULL || menu_items[i][0] == '\0')
			return -EINVAL;
		strlcpy(qmenu->name, menu_items[qmenu->index],
			sizeof(qmenu->name));
		return 0;
	}
	return v4l2_ctrl_query_menu(qmenu, NULL, NULL);
}

static int vidioc_querycap(struct file *file, void *priv,
			   struct v4l2_capability *cap)
{
	struct s2255_fh *fh = file->private_data;
	struct s2255_dev *dev = fh->dev;
	strlcpy(cap->driver, "s2255", sizeof(cap->driver));
	strlcpy(cap->card, "s2255", sizeof(cap->card));
	usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
	return 0;
}

static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
			       struct v4l2_fmtdesc *f)
{
	int index = f->index;

	if (index >= ARRAY_SIZE(formats))
		return -EINVAL;
	if (!jpeg_enable && ((formats[index].fourcc == V4L2_PIX_FMT_JPEG) ||
			(formats[index].fourcc == V4L2_PIX_FMT_MJPEG)))
		return -EINVAL;
	dprintk(4, "name %s\n", formats[index].name);
	strlcpy(f->description, formats[index].name, sizeof(f->description));
	f->pixelformat = formats[index].fourcc;
	return 0;
}

static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
			    struct v4l2_format *f)
{
	struct s2255_fh *fh = priv;
	struct s2255_channel *channel = fh->channel;

	f->fmt.pix.width = channel->width;
	f->fmt.pix.height = channel->height;
	f->fmt.pix.field = fh->vb_vidq.field;
	f->fmt.pix.pixelformat = channel->fmt->fourcc;
	f->fmt.pix.bytesperline = f->fmt.pix.width * (channel->fmt->depth >> 3);
	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
	return 0;
}

static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
			      struct v4l2_format *f)
{
	const struct s2255_fmt *fmt;
	enum v4l2_field field;
	int  b_any_field = 0;
	struct s2255_fh *fh = priv;
	struct s2255_channel *channel = fh->channel;
	int is_ntsc;
	is_ntsc =
		(channel->vdev.current_norm & V4L2_STD_NTSC) ? 1 : 0;

	fmt = format_by_fourcc(f->fmt.pix.pixelformat);

	if (fmt == NULL)
		return -EINVAL;

	field = f->fmt.pix.field;
	if (field == V4L2_FIELD_ANY)
		b_any_field = 1;

	dprintk(50, "%s NTSC: %d suggested width: %d, height: %d\n",
		__func__, is_ntsc, f->fmt.pix.width, f->fmt.pix.height);
	if (is_ntsc) {
		/* NTSC */
		if (f->fmt.pix.height >= NUM_LINES_1CIFS_NTSC * 2) {
			f->fmt.pix.height = NUM_LINES_1CIFS_NTSC * 2;
			if (b_any_field) {
				field = V4L2_FIELD_SEQ_TB;
			} else if (!((field == V4L2_FIELD_INTERLACED) ||
				      (field == V4L2_FIELD_SEQ_TB) ||
				      (field == V4L2_FIELD_INTERLACED_TB))) {
				dprintk(1, "unsupported field setting\n");
				return -EINVAL;
			}
		} else {
			f->fmt.pix.height = NUM_LINES_1CIFS_NTSC;
			if (b_any_field) {
				field = V4L2_FIELD_TOP;
			} else if (!((field == V4L2_FIELD_TOP) ||
				      (field == V4L2_FIELD_BOTTOM))) {
				dprintk(1, "unsupported field setting\n");
				return -EINVAL;
			}

		}
		if (f->fmt.pix.width >= LINE_SZ_4CIFS_NTSC)
			f->fmt.pix.width = LINE_SZ_4CIFS_NTSC;
		else if (f->fmt.pix.width >= LINE_SZ_2CIFS_NTSC)
			f->fmt.pix.width = LINE_SZ_2CIFS_NTSC;
		else if (f->fmt.pix.width >= LINE_SZ_1CIFS_NTSC)
			f->fmt.pix.width = LINE_SZ_1CIFS_NTSC;
		else
			f->fmt.pix.width = LINE_SZ_1CIFS_NTSC;
	} else {
		/* PAL */
		if (f->fmt.pix.height >= NUM_LINES_1CIFS_PAL * 2) {
			f->fmt.pix.height = NUM_LINES_1CIFS_PAL * 2;
			if (b_any_field) {
				field = V4L2_FIELD_SEQ_TB;
			} else if (!((field == V4L2_FIELD_INTERLACED) ||
				      (field == V4L2_FIELD_SEQ_TB) ||
				      (field == V4L2_FIELD_INTERLACED_TB))) {
				dprintk(1, "unsupported field setting\n");
				return -EINVAL;
			}
		} else {
			f->fmt.pix.height = NUM_LINES_1CIFS_PAL;
			if (b_any_field) {
				field = V4L2_FIELD_TOP;
			} else if (!((field == V4L2_FIELD_TOP) ||
				     (field == V4L2_FIELD_BOTTOM))) {
				dprintk(1, "unsupported field setting\n");
				return -EINVAL;
			}
		}
		if (f->fmt.pix.width >= LINE_SZ_4CIFS_PAL) {
			f->fmt.pix.width = LINE_SZ_4CIFS_PAL;
			field = V4L2_FIELD_SEQ_TB;
		} else if (f->fmt.pix.width >= LINE_SZ_2CIFS_PAL) {
			f->fmt.pix.width = LINE_SZ_2CIFS_PAL;
			field = V4L2_FIELD_TOP;
		} else if (f->fmt.pix.width >= LINE_SZ_1CIFS_PAL) {
			f->fmt.pix.width = LINE_SZ_1CIFS_PAL;
			field = V4L2_FIELD_TOP;
		} else {
			f->fmt.pix.width = LINE_SZ_1CIFS_PAL;
			field = V4L2_FIELD_TOP;
		}
	}
	f->fmt.pix.field = field;
	f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
	dprintk(50, "%s: set width %d height %d field %d\n", __func__,
		f->fmt.pix.width, f->fmt.pix.height, f->fmt.pix.field);
	return 0;
}

static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
			    struct v4l2_format *f)
{
	struct s2255_fh *fh = priv;
	struct s2255_channel *channel = fh->channel;
	const struct s2255_fmt *fmt;
	struct videobuf_queue *q = &fh->vb_vidq;
	struct s2255_mode mode;
	int ret;

	ret = vidioc_try_fmt_vid_cap(file, fh, f);

	if (ret < 0)
		return ret;

	fmt = format_by_fourcc(f->fmt.pix.pixelformat);

	if (fmt == NULL)
		return -EINVAL;

	mutex_lock(&q->vb_lock);

	if (videobuf_queue_is_busy(&fh->vb_vidq)) {
		dprintk(1, "queue busy\n");
		ret = -EBUSY;
		goto out_s_fmt;
	}

	if (res_locked(fh)) {
		dprintk(1, "%s: channel busy\n", __func__);
		ret = -EBUSY;
		goto out_s_fmt;
	}
	mode = channel->mode;
	channel->fmt = fmt;
	channel->width = f->fmt.pix.width;
	channel->height = f->fmt.pix.height;
	fh->vb_vidq.field = f->fmt.pix.field;
	fh->type = f->type;
	if (channel->width > norm_minw(&channel->vdev)) {
		if (channel->height > norm_minh(&channel->vdev)) {
			if (channel->cap_parm.capturemode &
			    V4L2_MODE_HIGHQUALITY)
				mode.scale = SCALE_4CIFSI;
			else
				mode.scale = SCALE_4CIFS;
		} else
			mode.scale = SCALE_2CIFS;

	} else {
		mode.scale = SCALE_1CIFS;
	}
	/* color mode */
	switch (channel->fmt->fourcc) {
	case V4L2_PIX_FMT_GREY:
		mode.color &= ~MASK_COLOR;
		mode.color |= COLOR_Y8;
		break;
	case V4L2_PIX_FMT_JPEG:
	case V4L2_PIX_FMT_MJPEG:
		mode.color &= ~MASK_COLOR;
		mode.color |= COLOR_JPG;
		mode.color |= (channel->jc.quality << 8);
		break;
	case V4L2_PIX_FMT_YUV422P:
		mode.color &= ~MASK_COLOR;
		mode.color |= COLOR_YUVPL;
		break;
	case V4L2_PIX_FMT_YUYV:
	case V4L2_PIX_FMT_UYVY:
	default:
		mode.color &= ~MASK_COLOR;
		mode.color |= COLOR_YUVPK;
		break;
	}
	if ((mode.color & MASK_COLOR) != (channel->mode.color & MASK_COLOR))
		mode.restart = 1;
	else if (mode.scale != channel->mode.scale)
		mode.restart = 1;
	else if (mode.format != channel->mode.format)
		mode.restart = 1;
	channel->mode = mode;
	(void) s2255_set_mode(channel, &mode);
	ret = 0;
out_s_fmt:
	mutex_unlock(&q->vb_lock);
	return ret;
}

static int vidioc_reqbufs(struct file *file, void *priv,
			  struct v4l2_requestbuffers *p)
{
	int rc;
	struct s2255_fh *fh = priv;
	rc = videobuf_reqbufs(&fh->vb_vidq, p);
	return rc;
}

static int vidioc_querybuf(struct file *file, void *priv, struct v4l2_buffer *p)
{
	int rc;
	struct s2255_fh *fh = priv;
	rc = videobuf_querybuf(&fh->vb_vidq, p);
	return rc;
}

static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
{
	int rc;
	struct s2255_fh *fh = priv;
	rc = videobuf_qbuf(&fh->vb_vidq, p);
	return rc;
}

static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
{
	int rc;
	struct s2255_fh *fh = priv;
	rc = videobuf_dqbuf(&fh->vb_vidq, p, file->f_flags & O_NONBLOCK);
	return rc;
}

/* write to the configuration pipe, synchronously */
static int s2255_write_config(struct usb_device *udev, unsigned char *pbuf,
			      int size)
{
	int pipe;
	int done;
	long retval = -1;
	if (udev) {
		pipe = usb_sndbulkpipe(udev, S2255_CONFIG_EP);
		retval = usb_bulk_msg(udev, pipe, pbuf, size, &done, 500);
	}
	return retval;
}

static u32 get_transfer_size(struct s2255_mode *mode)
{
	int linesPerFrame = LINE_SZ_DEF;
	int pixelsPerLine = NUM_LINES_DEF;
	u32 outImageSize;
	u32 usbInSize;
	unsigned int mask_mult;

	if (mode == NULL)
		return 0;

	if (mode->format == FORMAT_NTSC) {
		switch (mode->scale) {
		case SCALE_4CIFS:
		case SCALE_4CIFSI:
			linesPerFrame = NUM_LINES_4CIFS_NTSC * 2;
			pixelsPerLine = LINE_SZ_4CIFS_NTSC;
			break;
		case SCALE_2CIFS:
			linesPerFrame = NUM_LINES_2CIFS_NTSC;
			pixelsPerLine = LINE_SZ_2CIFS_NTSC;
			break;
		case SCALE_1CIFS:
			linesPerFrame = NUM_LINES_1CIFS_NTSC;
			pixelsPerLine = LINE_SZ_1CIFS_NTSC;
			break;
		default:
			break;
		}
	} else if (mode->format == FORMAT_PAL) {
		switch (mode->scale) {
		case SCALE_4CIFS:
		case SCALE_4CIFSI:
			linesPerFrame = NUM_LINES_4CIFS_PAL * 2;
			pixelsPerLine = LINE_SZ_4CIFS_PAL;
			break;
		case SCALE_2CIFS:
			linesPerFrame = NUM_LINES_2CIFS_PAL;
			pixelsPerLine = LINE_SZ_2CIFS_PAL;
			break;
		case SCALE_1CIFS:
			linesPerFrame = NUM_LINES_1CIFS_PAL;
			pixelsPerLine = LINE_SZ_1CIFS_PAL;
			break;
		default:
			break;
		}
	}
	outImageSize = linesPerFrame * pixelsPerLine;
	if ((mode->color & MASK_COLOR) != COLOR_Y8) {
		/* 2 bytes/pixel if not monochrome */
		outImageSize *= 2;
	}

	/* total bytes to send including prefix and 4K padding;
	   must be a multiple of USB_READ_SIZE */
	usbInSize = outImageSize + PREFIX_SIZE;	/* always send prefix */
	mask_mult = 0xffffffffUL - DEF_USB_BLOCK + 1;
	/* if size not a multiple of USB_READ_SIZE */
	if (usbInSize & ~mask_mult)
		usbInSize = (usbInSize & mask_mult) + (DEF_USB_BLOCK);
	return usbInSize;
}

static void s2255_print_cfg(struct s2255_dev *sdev, struct s2255_mode *mode)
{
	struct device *dev = &sdev->udev->dev;
	dev_info(dev, "------------------------------------------------\n");
	dev_info(dev, "format: %d\nscale %d\n", mode->format, mode->scale);
	dev_info(dev, "fdec: %d\ncolor %d\n", mode->fdec, mode->color);
	dev_info(dev, "bright: 0x%x\n", mode->bright);
	dev_info(dev, "------------------------------------------------\n");
}

/*
 * set mode is the function which controls the DSP.
 * the restart parameter in struct s2255_mode should be set whenever
 * the image size could change via color format, video system or image
 * size.
 * When the restart parameter is set, we sleep for ONE frame to allow the
 * DSP time to get the new frame
 */
static int s2255_set_mode(struct s2255_channel *channel,
			  struct s2255_mode *mode)
{
	int res;
	__le32 *buffer;
	unsigned long chn_rev;
	struct s2255_dev *dev = to_s2255_dev(channel->vdev.v4l2_dev);
	chn_rev = G_chnmap[channel->idx];
	dprintk(3, "%s channel: %d\n", __func__, channel->idx);
	/* if JPEG, set the quality */
	if ((mode->color & MASK_COLOR) == COLOR_JPG) {
		mode->color &= ~MASK_COLOR;
		mode->color |= COLOR_JPG;
		mode->color &= ~MASK_JPG_QUALITY;
		mode->color |= (channel->jc.quality << 8);
	}
	/* save the mode */
	channel->mode = *mode;
	channel->req_image_size = get_transfer_size(mode);
	dprintk(1, "%s: reqsize %ld\n", __func__, channel->req_image_size);
	buffer = kzalloc(512, GFP_KERNEL);
	if (buffer == NULL) {
		dev_err(&dev->udev->dev, "out of mem\n");
		return -ENOMEM;
	}
	/* set the mode */
	buffer[0] = IN_DATA_TOKEN;
	buffer[1] = (__le32) cpu_to_le32(chn_rev);
	buffer[2] = CMD_SET_MODE;
	memcpy(&buffer[3], &channel->mode, sizeof(struct s2255_mode));
	channel->setmode_ready = 0;
	res = s2255_write_config(dev->udev, (unsigned char *)buffer, 512);
	if (debug)
		s2255_print_cfg(dev, mode);
	kfree(buffer);
	/* wait at least 3 frames before continuing */
	if (mode->restart) {
		wait_event_timeout(channel->wait_setmode,
				   (channel->setmode_ready != 0),
				   msecs_to_jiffies(S2255_SETMODE_TIMEOUT));
		if (channel->setmode_ready != 1) {
			printk(KERN_DEBUG "s2255: no set mode response\n");
			res = -EFAULT;
		}
	}
	/* clear the restart flag */
	channel->mode.restart = 0;
	dprintk(1, "%s chn %d, result: %d\n", __func__, channel->idx, res);
	return res;
}

static int s2255_cmd_status(struct s2255_channel *channel, u32 *pstatus)
{
	int res;
	__le32 *buffer;
	u32 chn_rev;
	struct s2255_dev *dev = to_s2255_dev(channel->vdev.v4l2_dev);
	chn_rev = G_chnmap[channel->idx];
	dprintk(4, "%s chan %d\n", __func__, channel->idx);
	buffer = kzalloc(512, GFP_KERNEL);
	if (buffer == NULL) {
		dev_err(&dev->udev->dev, "out of mem\n");
		return -ENOMEM;
	}
	/* form the get vid status command */
	buffer[0] = IN_DATA_TOKEN;
	buffer[1] = (__le32) cpu_to_le32(chn_rev);
	buffer[2] = CMD_STATUS;
	*pstatus = 0;
	channel->vidstatus_ready = 0;
	res = s2255_write_config(dev->udev, (unsigned char *)buffer, 512);
	kfree(buffer);
	wait_event_timeout(channel->wait_vidstatus,
			   (channel->vidstatus_ready != 0),
			   msecs_to_jiffies(S2255_VIDSTATUS_TIMEOUT));
	if (channel->vidstatus_ready != 1) {
		printk(KERN_DEBUG "s2255: no vidstatus response\n");
		res = -EFAULT;
	}
	*pstatus = channel->vidstatus;
	dprintk(4, "%s, vid status %d\n", __func__, *pstatus);
	return res;
}

static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
{
	int res;
	struct s2255_fh *fh = priv;
	struct s2255_dev *dev = fh->dev;
	struct s2255_channel *channel = fh->channel;
	int j;
	dprintk(4, "%s\n", __func__);
	if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
		dev_err(&dev->udev->dev, "invalid fh type0\n");
		return -EINVAL;
	}
	if (i != fh->type) {
		dev_err(&dev->udev->dev, "invalid fh type1\n");
		return -EINVAL;
	}

	if (!res_get(fh)) {
		s2255_dev_err(&dev->udev->dev, "stream busy\n");
		return -EBUSY;
	}
	channel->last_frame = -1;
	channel->bad_payload = 0;
	channel->cur_frame = 0;
	channel->frame_count = 0;
	for (j = 0; j < SYS_FRAMES; j++) {
		channel->buffer.frame[j].ulState = S2255_READ_IDLE;
		channel->buffer.frame[j].cur_size = 0;
	}
	res = videobuf_streamon(&fh->vb_vidq);
	if (res == 0) {
		s2255_start_acquire(channel);
		channel->b_acquire = 1;
	} else
		res_free(fh);

	return res;
}

static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
{
	struct s2255_fh *fh = priv;
	dprintk(4, "%s\n, channel: %d", __func__, fh->channel->idx);
	if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
		printk(KERN_ERR "invalid fh type0\n");
		return -EINVAL;
	}
	if (i != fh->type) {
		printk(KERN_ERR "invalid type i\n");
		return -EINVAL;
	}
	s2255_stop_acquire(fh->channel);
	videobuf_streamoff(&fh->vb_vidq);
	res_free(fh);
	return 0;
}

static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *i)
{
	struct s2255_fh *fh = priv;
	struct s2255_mode mode;
	struct videobuf_queue *q = &fh->vb_vidq;
	int ret = 0;
	mutex_lock(&q->vb_lock);
	if (videobuf_queue_is_busy(q)) {
		dprintk(1, "queue busy\n");
		ret = -EBUSY;
		goto out_s_std;
	}
	if (res_locked(fh)) {
		dprintk(1, "can't change standard after started\n");
		ret = -EBUSY;
		goto out_s_std;
	}
	mode = fh->channel->mode;
	if (*i & V4L2_STD_NTSC) {
		dprintk(4, "%s NTSC\n", __func__);
		/* if changing format, reset frame decimation/intervals */
		if (mode.format != FORMAT_NTSC) {
			mode.restart = 1;
			mode.format = FORMAT_NTSC;
			mode.fdec = FDEC_1;
		}
	} else if (*i & V4L2_STD_PAL) {
		dprintk(4, "%s PAL\n", __func__);
		if (mode.format != FORMAT_PAL) {
			mode.restart = 1;
			mode.format = FORMAT_PAL;
			mode.fdec = FDEC_1;
		}
	} else {
		ret = -EINVAL;
	}
	if (mode.restart)
		s2255_set_mode(fh->channel, &mode);
out_s_std:
	mutex_unlock(&q->vb_lock);
	return ret;
}

/* Sensoray 2255 is a multiple channel capture device.
   It does not have a "crossbar" of inputs.
   We use one V4L device per channel. The user must
   be aware that certain combinations are not allowed.
   For instance, you cannot do full FPS on more than 2 channels(2 videodevs)
   at once in color(you can do full fps on 4 channels with greyscale.
*/
static int vidioc_enum_input(struct file *file, void *priv,
			     struct v4l2_input *inp)
{
	struct s2255_fh *fh = priv;
	struct s2255_dev *dev = fh->dev;
	struct s2255_channel *channel = fh->channel;
	u32 status = 0;
	if (inp->index != 0)
		return -EINVAL;
	inp->type = V4L2_INPUT_TYPE_CAMERA;
	inp->std = S2255_NORMS;
	inp->status = 0;
	if (dev->dsp_fw_ver >= S2255_MIN_DSP_STATUS) {
		int rc;
		rc = s2255_cmd_status(fh->channel, &status);
		dprintk(4, "s2255_cmd_status rc: %d status %x\n", rc, status);
		if (rc == 0)
			inp->status =  (status & 0x01) ? 0
				: V4L2_IN_ST_NO_SIGNAL;
	}
	switch (dev->pid) {
	case 0x2255:
	default:
		strlcpy(inp->name, "Composite", sizeof(inp->name));
		break;
	case 0x2257:
		strlcpy(inp->name, (channel->idx < 2) ? "Composite" : "S-Video",
			sizeof(inp->name));
		break;
	}
	return 0;
}

static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
{
	*i = 0;
	return 0;
}
static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
{
	if (i > 0)
		return -EINVAL;
	return 0;
}

/* --- controls ---------------------------------------------- */
static int vidioc_queryctrl(struct file *file, void *priv,
			    struct v4l2_queryctrl *qc)
{
	struct s2255_fh *fh = priv;
	struct s2255_channel *channel = fh->channel;
	struct s2255_dev *dev = fh->dev;
	switch (qc->id) {
	case V4L2_CID_BRIGHTNESS:
		v4l2_ctrl_query_fill(qc, -127, 127, 1, DEF_BRIGHT);
		break;
	case V4L2_CID_CONTRAST:
		v4l2_ctrl_query_fill(qc, 0, 255, 1, DEF_CONTRAST);
		break;
	case V4L2_CID_SATURATION:
		v4l2_ctrl_query_fill(qc, 0, 255, 1, DEF_SATURATION);
		break;
	case V4L2_CID_HUE:
		v4l2_ctrl_query_fill(qc, 0, 255, 1, DEF_HUE);
		break;
	case V4L2_CID_PRIVATE_COLORFILTER:
		if (dev->dsp_fw_ver < S2255_MIN_DSP_COLORFILTER)
			return -EINVAL;
		if ((dev->pid == 0x2257) && (channel->idx > 1))
			return -EINVAL;
		strlcpy(qc->name, "Color Filter", sizeof(qc->name));
		qc->type = V4L2_CTRL_TYPE_MENU;
		qc->minimum = 0;
		qc->maximum = 1;
		qc->step = 1;
		qc->default_value = 1;
		qc->flags = 0;
		break;
	default:
		return -EINVAL;
	}
	dprintk(4, "%s, id %d\n", __func__, qc->id);
	return 0;
}

static int vidioc_g_ctrl(struct file *file, void *priv,
			 struct v4l2_control *ctrl)
{
	struct s2255_fh *fh = priv;
	struct s2255_dev *dev = fh->dev;
	struct s2255_channel *channel = fh->channel;
	switch (ctrl->id) {
	case V4L2_CID_BRIGHTNESS:
		ctrl->value = channel->mode.bright;
		break;
	case V4L2_CID_CONTRAST:
		ctrl->value = channel->mode.contrast;
		break;
	case V4L2_CID_SATURATION:
		ctrl->value = channel->mode.saturation;
		break;
	case V4L2_CID_HUE:
		ctrl->value = channel->mode.hue;
		break;
	case V4L2_CID_PRIVATE_COLORFILTER:
		if (dev->dsp_fw_ver < S2255_MIN_DSP_COLORFILTER)
			return -EINVAL;
		if ((dev->pid == 0x2257) && (channel->idx > 1))
			return -EINVAL;
		ctrl->value = !((channel->mode.color & MASK_INPUT_TYPE) >> 16);
		break;
	default:
		return -EINVAL;
	}
	dprintk(4, "%s, id %d val %d\n", __func__, ctrl->id, ctrl->value);
	return 0;
}

static int vidioc_s_ctrl(struct file *file, void *priv,
			 struct v4l2_control *ctrl)
{
	struct s2255_fh *fh = priv;
	struct s2255_channel *channel = fh->channel;
	struct s2255_dev *dev = to_s2255_dev(channel->vdev.v4l2_dev);
	struct s2255_mode mode;
	mode = channel->mode;
	dprintk(4, "%s\n", __func__);
	/* update the mode to the corresponding value */
	switch (ctrl->id) {
	case V4L2_CID_BRIGHTNESS:
		mode.bright = ctrl->value;
		break;
	case V4L2_CID_CONTRAST:
		mode.contrast = ctrl->value;
		break;
	case V4L2_CID_HUE:
		mode.hue = ctrl->value;
		break;
	case V4L2_CID_SATURATION:
		mode.saturation = ctrl->value;
		break;
	case V4L2_CID_PRIVATE_COLORFILTER:
		if (dev->dsp_fw_ver < S2255_MIN_DSP_COLORFILTER)
			return -EINVAL;
		if ((dev->pid == 0x2257) && (channel->idx > 1))
			return -EINVAL;
		mode.color &= ~MASK_INPUT_TYPE;
		mode.color |= ((ctrl->value ? 0 : 1) << 16);
		break;
	default:
		return -EINVAL;
	}
	mode.restart = 0;
	/* set mode here.  Note: stream does not need restarted.
	   some V4L programs restart stream unnecessarily
	   after a s_crtl.
	*/
	s2255_set_mode(fh->channel, &mode);
	return 0;
}

static int vidioc_g_jpegcomp(struct file *file, void *priv,
			 struct v4l2_jpegcompression *jc)
{
	struct s2255_fh *fh = priv;
	struct s2255_channel *channel = fh->channel;
	*jc = channel->jc;
	dprintk(2, "%s: quality %d\n", __func__, jc->quality);
	return 0;
}

static int vidioc_s_jpegcomp(struct file *file, void *priv,
			 const struct v4l2_jpegcompression *jc)
{
	struct s2255_fh *fh = priv;
	struct s2255_channel *channel = fh->channel;
	if (jc->quality < 0 || jc->quality > 100)
		return -EINVAL;
	channel->jc.quality = jc->quality;
	dprintk(2, "%s: quality %d\n", __func__, jc->quality);
	return 0;
}

static int vidioc_g_parm(struct file *file, void *priv,
			 struct v4l2_streamparm *sp)
{
	struct s2255_fh *fh = priv;
	__u32 def_num, def_dem;
	struct s2255_channel *channel = fh->channel;
	if (sp->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;
	memset(sp, 0, sizeof(struct v4l2_streamparm));
	sp->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
	sp->parm.capture.capturemode = channel->cap_parm.capturemode;
	def_num = (channel->mode.format == FORMAT_NTSC) ? 1001 : 1000;
	def_dem = (channel->mode.format == FORMAT_NTSC) ? 30000 : 25000;
	sp->parm.capture.timeperframe.denominator = def_dem;
	switch (channel->mode.fdec) {
	default:
	case FDEC_1:
		sp->parm.capture.timeperframe.numerator = def_num;
		break;
	case FDEC_2:
		sp->parm.capture.timeperframe.numerator = def_num * 2;
		break;
	case FDEC_3:
		sp->parm.capture.timeperframe.numerator = def_num * 3;
		break;
	case FDEC_5:
		sp->parm.capture.timeperframe.numerator = def_num * 5;
		break;
	}
	dprintk(4, "%s capture mode, %d timeperframe %d/%d\n", __func__,
		sp->parm.capture.capturemode,
		sp->parm.capture.timeperframe.numerator,
		sp->parm.capture.timeperframe.denominator);
	return 0;
}

static int vidioc_s_parm(struct file *file, void *priv,
			 struct v4l2_streamparm *sp)
{
	struct s2255_fh *fh = priv;
	struct s2255_channel *channel = fh->channel;
	struct s2255_mode mode;
	int fdec = FDEC_1;
	__u32 def_num, def_dem;
	if (sp->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;
	mode = channel->mode;
	/* high quality capture mode requires a stream restart */
	if (channel->cap_parm.capturemode
	    != sp->parm.capture.capturemode && res_locked(fh))
		return -EBUSY;
	def_num = (mode.format == FORMAT_NTSC) ? 1001 : 1000;
	def_dem = (mode.format == FORMAT_NTSC) ? 30000 : 25000;
	if (def_dem != sp->parm.capture.timeperframe.denominator)
		sp->parm.capture.timeperframe.numerator = def_num;
	else if (sp->parm.capture.timeperframe.numerator <= def_num)
		sp->parm.capture.timeperframe.numerator = def_num;
	else if (sp->parm.capture.timeperframe.numerator <= (def_num * 2)) {
		sp->parm.capture.timeperframe.numerator = def_num * 2;
		fdec = FDEC_2;
	} else if (sp->parm.capture.timeperframe.numerator <= (def_num * 3)) {
		sp->parm.capture.timeperframe.numerator = def_num * 3;
		fdec = FDEC_3;
	} else {
		sp->parm.capture.timeperframe.numerator = def_num * 5;
		fdec = FDEC_5;
	}
	mode.fdec = fdec;
	sp->parm.capture.timeperframe.denominator = def_dem;
	s2255_set_mode(channel, &mode);
	dprintk(4, "%s capture mode, %d timeperframe %d/%d, fdec %d\n",
		__func__,
		sp->parm.capture.capturemode,
		sp->parm.capture.timeperframe.numerator,
		sp->parm.capture.timeperframe.denominator, fdec);
	return 0;
}

static int vidioc_enum_frameintervals(struct file *file, void *priv,
			    struct v4l2_frmivalenum *fe)
{
	int is_ntsc = 0;
#define NUM_FRAME_ENUMS 4
	int frm_dec[NUM_FRAME_ENUMS] = {1, 2, 3, 5};
	if (fe->index >= NUM_FRAME_ENUMS)
		return -EINVAL;
	switch (fe->width) {
	case 640:
		if (fe->height != 240 && fe->height != 480)
			return -EINVAL;
		is_ntsc = 1;
		break;
	case 320:
		if (fe->height != 240)
			return -EINVAL;
		is_ntsc = 1;
		break;
	case 704:
		if (fe->height != 288 && fe->height != 576)
			return -EINVAL;
		break;
	case 352:
		if (fe->height != 288)
			return -EINVAL;
		break;
	default:
		return -EINVAL;
	}
	fe->type = V4L2_FRMIVAL_TYPE_DISCRETE;
	fe->discrete.denominator = is_ntsc ? 30000 : 25000;
	fe->discrete.numerator = (is_ntsc ? 1001 : 1000) * frm_dec[fe->index];
	dprintk(4, "%s discrete %d/%d\n", __func__, fe->discrete.numerator,
		fe->discrete.denominator);
	return 0;
}

static int __s2255_open(struct file *file)
{
	struct video_device *vdev = video_devdata(file);
	struct s2255_channel *channel = video_drvdata(file);
	struct s2255_dev *dev = to_s2255_dev(vdev->v4l2_dev);
	struct s2255_fh *fh;
	enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	int state;
	dprintk(1, "s2255: open called (dev=%s)\n",
		video_device_node_name(vdev));
	state = atomic_read(&dev->fw_data->fw_state);
	switch (state) {
	case S2255_FW_DISCONNECTING:
		return -ENODEV;
	case S2255_FW_FAILED:
		s2255_dev_err(&dev->udev->dev,
			"firmware load failed. retrying.\n");
		s2255_fwload_start(dev, 1);
		wait_event_timeout(dev->fw_data->wait_fw,
				   ((atomic_read(&dev->fw_data->fw_state)
				     == S2255_FW_SUCCESS) ||
				    (atomic_read(&dev->fw_data->fw_state)
				     == S2255_FW_DISCONNECTING)),
				   msecs_to_jiffies(S2255_LOAD_TIMEOUT));
		/* state may have changed, re-read */
		state = atomic_read(&dev->fw_data->fw_state);
		break;
	case S2255_FW_NOTLOADED:
	case S2255_FW_LOADED_DSPWAIT:
		/* give S2255_LOAD_TIMEOUT time for firmware to load in case
		   driver loaded and then device immediately opened */
		printk(KERN_INFO "%s waiting for firmware load\n", __func__);
		wait_event_timeout(dev->fw_data->wait_fw,
				   ((atomic_read(&dev->fw_data->fw_state)
				     == S2255_FW_SUCCESS) ||
				    (atomic_read(&dev->fw_data->fw_state)
				     == S2255_FW_DISCONNECTING)),
				   msecs_to_jiffies(S2255_LOAD_TIMEOUT));
		/* state may have changed, re-read */
		state = atomic_read(&dev->fw_data->fw_state);
		break;
	case S2255_FW_SUCCESS:
	default:
		break;
	}
	/* state may have changed in above switch statement */
	switch (state) {
	case S2255_FW_SUCCESS:
		break;
	case S2255_FW_FAILED:
		printk(KERN_INFO "2255 firmware load failed.\n");
		return -ENODEV;
	case S2255_FW_DISCONNECTING:
		printk(KERN_INFO "%s: disconnecting\n", __func__);
		return -ENODEV;
	case S2255_FW_LOADED_DSPWAIT:
	case S2255_FW_NOTLOADED:
		printk(KERN_INFO "%s: firmware not loaded yet"
		       "please try again later\n",
		       __func__);
		/*
		 * Timeout on firmware load means device unusable.
		 * Set firmware failure state.
		 * On next s2255_open the firmware will be reloaded.
		 */
		atomic_set(&dev->fw_data->fw_state,
			   S2255_FW_FAILED);
		return -EAGAIN;
	default:
		printk(KERN_INFO "%s: unknown state\n", __func__);
		return -EFAULT;
	}
	/* allocate + initialize per filehandle data */
	fh = kzalloc(sizeof(*fh), GFP_KERNEL);
	if (NULL == fh)
		return -ENOMEM;
	file->private_data = fh;
	fh->dev = dev;
	fh->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	fh->channel = channel;
	if (!channel->configured) {
		/* configure channel to default state */
		channel->fmt = &formats[0];
		s2255_set_mode(channel, &channel->mode);
		channel->configured = 1;
	}
	dprintk(1, "%s: dev=%s type=%s\n", __func__,
		video_device_node_name(vdev), v4l2_type_names[type]);
	dprintk(2, "%s: fh=0x%08lx, dev=0x%08lx, vidq=0x%08lx\n", __func__,
		(unsigned long)fh, (unsigned long)dev,
		(unsigned long)&channel->vidq);
	dprintk(4, "%s: list_empty active=%d\n", __func__,
		list_empty(&channel->vidq.active));
	videobuf_queue_vmalloc_init(&fh->vb_vidq, &s2255_video_qops,
				    NULL, &dev->slock,
				    fh->type,
				    V4L2_FIELD_INTERLACED,
				    sizeof(struct s2255_buffer),
				    fh, vdev->lock);
	return 0;
}

static int s2255_open(struct file *file)
{
	struct video_device *vdev = video_devdata(file);
	int ret;

	if (mutex_lock_interruptible(vdev->lock))
		return -ERESTARTSYS;
	ret = __s2255_open(file);
	mutex_unlock(vdev->lock);
	return ret;
}

static unsigned int s2255_poll(struct file *file,
			       struct poll_table_struct *wait)
{
	struct s2255_fh *fh = file->private_data;
	struct s2255_dev *dev = fh->dev;
	int rc;
	dprintk(100, "%s\n", __func__);
	if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
		return POLLERR;
	mutex_lock(&dev->lock);
	rc = videobuf_poll_stream(file, &fh->vb_vidq, wait);
	mutex_unlock(&dev->lock);
	return rc;
}

static void s2255_destroy(struct s2255_dev *dev)
{
	/* board shutdown stops the read pipe if it is running */
	s2255_board_shutdown(dev);
	/* make sure firmware still not trying to load */
	del_timer(&dev->timer);  /* only started in .probe and .open */
	if (dev->fw_data->fw_urb) {
		usb_kill_urb(dev->fw_data->fw_urb);
		usb_free_urb(dev->fw_data->fw_urb);
		dev->fw_data->fw_urb = NULL;
	}
	release_firmware(dev->fw_data->fw);
	kfree(dev->fw_data->pfw_data);
	kfree(dev->fw_data);
	/* reset the DSP so firmware can be reloaded next time */
	s2255_reset_dsppower(dev);
	mutex_destroy(&dev->lock);
	usb_put_dev(dev->udev);
	v4l2_device_unregister(&dev->v4l2_dev);
	dprintk(1, "%s", __func__);
	kfree(dev);
}

static int s2255_release(struct file *file)
{
	struct s2255_fh *fh = file->private_data;
	struct s2255_dev *dev = fh->dev;
	struct video_device *vdev = video_devdata(file);
	struct s2255_channel *channel = fh->channel;
	if (!dev)
		return -ENODEV;
	mutex_lock(&dev->lock);
	/* turn off stream */
	if (res_check(fh)) {
		if (channel->b_acquire)
			s2255_stop_acquire(fh->channel);
		videobuf_streamoff(&fh->vb_vidq);
		res_free(fh);
	}
	videobuf_mmap_free(&fh->vb_vidq);
	mutex_unlock(&dev->lock);
	dprintk(1, "%s (dev=%s)\n", __func__, video_device_node_name(vdev));
	kfree(fh);
	return 0;
}

static int s2255_mmap_v4l(struct file *file, struct vm_area_struct *vma)
{
	struct s2255_fh *fh = file->private_data;
	struct s2255_dev *dev;
	int ret;

	if (!fh)
		return -ENODEV;
	dev = fh->dev;
	dprintk(4, "%s, vma=0x%08lx\n", __func__, (unsigned long)vma);
	if (mutex_lock_interruptible(&dev->lock))
		return -ERESTARTSYS;
	ret = videobuf_mmap_mapper(&fh->vb_vidq, vma);
	mutex_unlock(&dev->lock);
	dprintk(4, "%s vma start=0x%08lx, size=%ld, ret=%d\n", __func__,
		(unsigned long)vma->vm_start,
		(unsigned long)vma->vm_end - (unsigned long)vma->vm_start, ret);
	return ret;
}

static const struct v4l2_file_operations s2255_fops_v4l = {
	.owner = THIS_MODULE,
	.open = s2255_open,
	.release = s2255_release,
	.poll = s2255_poll,
	.unlocked_ioctl = video_ioctl2,	/* V4L2 ioctl handler */
	.mmap = s2255_mmap_v4l,
};

static const struct v4l2_ioctl_ops s2255_ioctl_ops = {
	.vidioc_querymenu = vidioc_querymenu,
	.vidioc_querycap = vidioc_querycap,
	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
	.vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
	.vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
	.vidioc_reqbufs = vidioc_reqbufs,
	.vidioc_querybuf = vidioc_querybuf,
	.vidioc_qbuf = vidioc_qbuf,
	.vidioc_dqbuf = vidioc_dqbuf,
	.vidioc_s_std = vidioc_s_std,
	.vidioc_enum_input = vidioc_enum_input,
	.vidioc_g_input = vidioc_g_input,
	.vidioc_s_input = vidioc_s_input,
	.vidioc_queryctrl = vidioc_queryctrl,
	.vidioc_g_ctrl = vidioc_g_ctrl,
	.vidioc_s_ctrl = vidioc_s_ctrl,
	.vidioc_streamon = vidioc_streamon,
	.vidioc_streamoff = vidioc_streamoff,
	.vidioc_s_jpegcomp = vidioc_s_jpegcomp,
	.vidioc_g_jpegcomp = vidioc_g_jpegcomp,
	.vidioc_s_parm = vidioc_s_parm,
	.vidioc_g_parm = vidioc_g_parm,
	.vidioc_enum_frameintervals = vidioc_enum_frameintervals,
};

static void s2255_video_device_release(struct video_device *vdev)
{
	struct s2255_dev *dev = to_s2255_dev(vdev->v4l2_dev);
	dprintk(4, "%s, chnls: %d \n", __func__,
		atomic_read(&dev->num_channels));
	if (atomic_dec_and_test(&dev->num_channels))
		s2255_destroy(dev);
	return;
}

static struct video_device template = {
	.name = "s2255v",
	.fops = &s2255_fops_v4l,
	.ioctl_ops = &s2255_ioctl_ops,
	.release = s2255_video_device_release,
	.tvnorms = S2255_NORMS,
	.current_norm = V4L2_STD_NTSC_M,
};

static int s2255_probe_v4l(struct s2255_dev *dev)
{
	int ret;
	int i;
	int cur_nr = video_nr;
	struct s2255_channel *channel;
	ret = v4l2_device_register(&dev->interface->dev, &dev->v4l2_dev);
	if (ret)
		return ret;
	/* initialize all video 4 linux */
	/* register 4 video devices */
	for (i = 0; i < MAX_CHANNELS; i++) {
		channel = &dev->channel[i];
		INIT_LIST_HEAD(&channel->vidq.active);
		channel->vidq.dev = dev;
		/* register 4 video devices */
		channel->vdev = template;
		channel->vdev.lock = &dev->lock;
		channel->vdev.v4l2_dev = &dev->v4l2_dev;
		video_set_drvdata(&channel->vdev, channel);
		if (video_nr == -1)
			ret = video_register_device(&channel->vdev,
						    VFL_TYPE_GRABBER,
						    video_nr);
		else
			ret = video_register_device(&channel->vdev,
						    VFL_TYPE_GRABBER,
						    cur_nr + i);

		if (ret) {
			dev_err(&dev->udev->dev,
				"failed to register video device!\n");
			break;
		}
		atomic_inc(&dev->num_channels);
		v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
			  video_device_node_name(&channel->vdev));

	}
	printk(KERN_INFO "Sensoray 2255 V4L driver Revision: %s\n",
	       S2255_VERSION);
	/* if no channels registered, return error and probe will fail*/
	if (atomic_read(&dev->num_channels) == 0) {
		v4l2_device_unregister(&dev->v4l2_dev);
		return ret;
	}
	if (atomic_read(&dev->num_channels) != MAX_CHANNELS)
		printk(KERN_WARNING "s2255: Not all channels available.\n");
	return 0;
}

/* this function moves the usb stream read pipe data
 * into the system buffers.
 * returns 0 on success, EAGAIN if more data to process( call this
 * function again).
 *
 * Received frame structure:
 * bytes 0-3:  marker : 0x2255DA4AL (S2255_MARKER_FRAME)
 * bytes 4-7:  channel: 0-3
 * bytes 8-11: payload size:  size of the frame
 * bytes 12-payloadsize+12:  frame data
 */
static int save_frame(struct s2255_dev *dev, struct s2255_pipeinfo *pipe_info)
{
	char *pdest;
	u32 offset = 0;
	int bframe = 0;
	char *psrc;
	unsigned long copy_size;
	unsigned long size;
	s32 idx = -1;
	struct s2255_framei *frm;
	unsigned char *pdata;
	struct s2255_channel *channel;
	dprintk(100, "buffer to user\n");
	channel = &dev->channel[dev->cc];
	idx = channel->cur_frame;
	frm = &channel->buffer.frame[idx];
	if (frm->ulState == S2255_READ_IDLE) {
		int jj;
		unsigned int cc;
		__le32 *pdword; /*data from dsp is little endian */
		int payload;
		/* search for marker codes */
		pdata = (unsigned char *)pipe_info->transfer_buffer;
		pdword = (__le32 *)pdata;
		for (jj = 0; jj < (pipe_info->cur_transfer_size - 12); jj++) {
			switch (*pdword) {
			case S2255_MARKER_FRAME:
				dprintk(4, "found frame marker at offset:"
					" %d [%x %x]\n", jj, pdata[0],
					pdata[1]);
				offset = jj + PREFIX_SIZE;
				bframe = 1;
				cc = le32_to_cpu(pdword[1]);
				if (cc >= MAX_CHANNELS) {
					printk(KERN_ERR
					       "bad channel\n");
					return -EINVAL;
				}
				/* reverse it */
				dev->cc = G_chnmap[cc];
				channel = &dev->channel[dev->cc];
				payload =  le32_to_cpu(pdword[3]);
				if (payload > channel->req_image_size) {
					channel->bad_payload++;
					/* discard the bad frame */
					return -EINVAL;
				}
				channel->pkt_size = payload;
				channel->jpg_size = le32_to_cpu(pdword[4]);
				break;
			case S2255_MARKER_RESPONSE:

				pdata += DEF_USB_BLOCK;
				jj += DEF_USB_BLOCK;
				if (le32_to_cpu(pdword[1]) >= MAX_CHANNELS)
					break;
				cc = G_chnmap[le32_to_cpu(pdword[1])];
				if (cc >= MAX_CHANNELS)
					break;
				channel = &dev->channel[cc];
				switch (pdword[2]) {
				case S2255_RESPONSE_SETMODE:
					/* check if channel valid */
					/* set mode ready */
					channel->setmode_ready = 1;
					wake_up(&channel->wait_setmode);
					dprintk(5, "setmode ready %d\n", cc);
					break;
				case S2255_RESPONSE_FW:
					dev->chn_ready |= (1 << cc);
					if ((dev->chn_ready & 0x0f) != 0x0f)
						break;
					/* all channels ready */
					printk(KERN_INFO "s2255: fw loaded\n");
					atomic_set(&dev->fw_data->fw_state,
						   S2255_FW_SUCCESS);
					wake_up(&dev->fw_data->wait_fw);
					break;
				case S2255_RESPONSE_STATUS:
					channel->vidstatus = le32_to_cpu(pdword[3]);
					channel->vidstatus_ready = 1;
					wake_up(&channel->wait_vidstatus);
					dprintk(5, "got vidstatus %x chan %d\n",
						le32_to_cpu(pdword[3]), cc);
					break;
				default:
					printk(KERN_INFO "s2255 unknown resp\n");
				}
			default:
				pdata++;
				break;
			}
			if (bframe)
				break;
		} /* for */
		if (!bframe)
			return -EINVAL;
	}
	channel = &dev->channel[dev->cc];
	idx = channel->cur_frame;
	frm = &channel->buffer.frame[idx];
	/* search done.  now find out if should be acquiring on this channel */
	if (!channel->b_acquire) {
		/* we found a frame, but this channel is turned off */
		frm->ulState = S2255_READ_IDLE;
		return -EINVAL;
	}

	if (frm->ulState == S2255_READ_IDLE) {
		frm->ulState = S2255_READ_FRAME;
		frm->cur_size = 0;
	}

	/* skip the marker 512 bytes (and offset if out of sync) */
	psrc = (u8 *)pipe_info->transfer_buffer + offset;


	if (frm->lpvbits == NULL) {
		dprintk(1, "s2255 frame buffer == NULL.%p %p %d %d",
			frm, dev, dev->cc, idx);
		return -ENOMEM;
	}

	pdest = frm->lpvbits + frm->cur_size;

	copy_size = (pipe_info->cur_transfer_size - offset);

	size = channel->pkt_size - PREFIX_SIZE;

	/* sanity check on pdest */
	if ((copy_size + frm->cur_size) < channel->req_image_size)
		memcpy(pdest, psrc, copy_size);

	frm->cur_size += copy_size;
	dprintk(4, "cur_size size %lu size %lu \n", frm->cur_size, size);

	if (frm->cur_size >= size) {
		dprintk(2, "****************[%d]Buffer[%d]full*************\n",
			dev->cc, idx);
		channel->last_frame = channel->cur_frame;
		channel->cur_frame++;
		/* end of system frame ring buffer, start at zero */
		if ((channel->cur_frame == SYS_FRAMES) ||
		    (channel->cur_frame == channel->buffer.dwFrames))
			channel->cur_frame = 0;
		/* frame ready */
		if (channel->b_acquire)
			s2255_got_frame(channel, channel->jpg_size);
		channel->frame_count++;
		frm->ulState = S2255_READ_IDLE;
		frm->cur_size = 0;

	}
	/* done successfully */
	return 0;
}

static void s2255_read_video_callback(struct s2255_dev *dev,
				      struct s2255_pipeinfo *pipe_info)
{
	int res;
	dprintk(50, "callback read video \n");

	if (dev->cc >= MAX_CHANNELS) {
		dev->cc = 0;
		dev_err(&dev->udev->dev, "invalid channel\n");
		return;
	}
	/* otherwise copy to the system buffers */
	res = save_frame(dev, pipe_info);
	if (res != 0)
		dprintk(4, "s2255: read callback failed\n");

	dprintk(50, "callback read video done\n");
	return;
}

static long s2255_vendor_req(struct s2255_dev *dev, unsigned char Request,
			     u16 Index, u16 Value, void *TransferBuffer,
			     s32 TransferBufferLength, int bOut)
{
	int r;
	if (!bOut) {
		r = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
				    Request,
				    USB_TYPE_VENDOR | USB_RECIP_DEVICE |
				    USB_DIR_IN,
				    Value, Index, TransferBuffer,
				    TransferBufferLength, HZ * 5);
	} else {
		r = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
				    Request, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
				    Value, Index, TransferBuffer,
				    TransferBufferLength, HZ * 5);
	}
	return r;
}

/*
 * retrieve FX2 firmware version. future use.
 * @param dev pointer to device extension
 * @return -1 for fail, else returns firmware version as an int(16 bits)
 */
static int s2255_get_fx2fw(struct s2255_dev *dev)
{
	int fw;
	int ret;
	unsigned char transBuffer[64];
	ret = s2255_vendor_req(dev, S2255_VR_FW, 0, 0, transBuffer, 2,
			       S2255_VR_IN);
	if (ret < 0)
		dprintk(2, "get fw error: %x\n", ret);
	fw = transBuffer[0] + (transBuffer[1] << 8);
	dprintk(2, "Get FW %x %x\n", transBuffer[0], transBuffer[1]);
	return fw;
}

/*
 * Create the system ring buffer to copy frames into from the
 * usb read pipe.
 */
static int s2255_create_sys_buffers(struct s2255_channel *channel)
{
	unsigned long i;
	unsigned long reqsize;
	dprintk(1, "create sys buffers\n");
	channel->buffer.dwFrames = SYS_FRAMES;
	/* always allocate maximum size(PAL) for system buffers */
	reqsize = SYS_FRAMES_MAXSIZE;

	if (reqsize > SYS_FRAMES_MAXSIZE)
		reqsize = SYS_FRAMES_MAXSIZE;

	for (i = 0; i < SYS_FRAMES; i++) {
		/* allocate the frames */
		channel->buffer.frame[i].lpvbits = vmalloc(reqsize);
		dprintk(1, "valloc %p chan %d, idx %lu, pdata %p\n",
			&channel->buffer.frame[i], channel->idx, i,
			channel->buffer.frame[i].lpvbits);
		channel->buffer.frame[i].size = reqsize;
		if (channel->buffer.frame[i].lpvbits == NULL) {
			printk(KERN_INFO "out of memory.  using less frames\n");
			channel->buffer.dwFrames = i;
			break;
		}
	}

	/* make sure internal states are set */
	for (i = 0; i < SYS_FRAMES; i++) {
		channel->buffer.frame[i].ulState = 0;
		channel->buffer.frame[i].cur_size = 0;
	}

	channel->cur_frame = 0;
	channel->last_frame = -1;
	return 0;
}

static int s2255_release_sys_buffers(struct s2255_channel *channel)
{
	unsigned long i;
	dprintk(1, "release sys buffers\n");
	for (i = 0; i < SYS_FRAMES; i++) {
		if (channel->buffer.frame[i].lpvbits) {
			dprintk(1, "vfree %p\n",
				channel->buffer.frame[i].lpvbits);
			vfree(channel->buffer.frame[i].lpvbits);
		}
		channel->buffer.frame[i].lpvbits = NULL;
	}
	return 0;
}

static int s2255_board_init(struct s2255_dev *dev)
{
	struct s2255_mode mode_def = DEF_MODEI_NTSC_CONT;
	int fw_ver;
	int j;
	struct s2255_pipeinfo *pipe = &dev->pipe;
	dprintk(4, "board init: %p", dev);
	memset(pipe, 0, sizeof(*pipe));
	pipe->dev = dev;
	pipe->cur_transfer_size = S2255_USB_XFER_SIZE;
	pipe->max_transfer_size = S2255_USB_XFER_SIZE;

	pipe->transfer_buffer = kzalloc(pipe->max_transfer_size,
					GFP_KERNEL);
	if (pipe->transfer_buffer == NULL) {
		dprintk(1, "out of memory!\n");
		return -ENOMEM;
	}
	/* query the firmware */
	fw_ver = s2255_get_fx2fw(dev);

	printk(KERN_INFO "s2255: usb firmware version %d.%d\n",
	       (fw_ver >> 8) & 0xff,
	       fw_ver & 0xff);

	if (fw_ver < S2255_CUR_USB_FWVER)
		printk(KERN_INFO "s2255: newer USB firmware available\n");

	for (j = 0; j < MAX_CHANNELS; j++) {
		struct s2255_channel *channel = &dev->channel[j];
		channel->b_acquire = 0;
		channel->mode = mode_def;
		if (dev->pid == 0x2257 && j > 1)
			channel->mode.color |= (1 << 16);
		channel->jc.quality = S2255_DEF_JPEG_QUAL;
		channel->width = LINE_SZ_4CIFS_NTSC;
		channel->height = NUM_LINES_4CIFS_NTSC * 2;
		channel->fmt = &formats[0];
		channel->mode.restart = 1;
		channel->req_image_size = get_transfer_size(&mode_def);
		channel->frame_count = 0;
		/* create the system buffers */
		s2255_create_sys_buffers(channel);
	}
	/* start read pipe */
	s2255_start_readpipe(dev);
	dprintk(1, "%s: success\n", __func__);
	return 0;
}

static int s2255_board_shutdown(struct s2255_dev *dev)
{
	u32 i;
	dprintk(1, "%s: dev: %p", __func__,  dev);

	for (i = 0; i < MAX_CHANNELS; i++) {
		if (dev->channel[i].b_acquire)
			s2255_stop_acquire(&dev->channel[i]);
	}
	s2255_stop_readpipe(dev);
	for (i = 0; i < MAX_CHANNELS; i++)
		s2255_release_sys_buffers(&dev->channel[i]);
	/* release transfer buffer */
	kfree(dev->pipe.transfer_buffer);
	return 0;
}

static void read_pipe_completion(struct urb *purb)
{
	struct s2255_pipeinfo *pipe_info;
	struct s2255_dev *dev;
	int status;
	int pipe;
	pipe_info = purb->context;
	dprintk(100, "%s: urb:%p, status %d\n", __func__, purb,
		purb->status);
	if (pipe_info == NULL) {
		dev_err(&purb->dev->dev, "no context!\n");
		return;
	}

	dev = pipe_info->dev;
	if (dev == NULL) {
		dev_err(&purb->dev->dev, "no context!\n");
		return;
	}
	status = purb->status;
	/* if shutting down, do not resubmit, exit immediately */
	if (status == -ESHUTDOWN) {
		dprintk(2, "%s: err shutdown\n", __func__);
		pipe_info->err_count++;
		return;
	}

	if (pipe_info->state == 0) {
		dprintk(2, "%s: exiting USB pipe", __func__);
		return;
	}

	if (status == 0)
		s2255_read_video_callback(dev, pipe_info);
	else {
		pipe_info->err_count++;
		dprintk(1, "%s: failed URB %d\n", __func__, status);
	}

	pipe = usb_rcvbulkpipe(dev->udev, dev->read_endpoint);
	/* reuse urb */
	usb_fill_bulk_urb(pipe_info->stream_urb, dev->udev,
			  pipe,
			  pipe_info->transfer_buffer,
			  pipe_info->cur_transfer_size,
			  read_pipe_completion, pipe_info);

	if (pipe_info->state != 0) {
		if (usb_submit_urb(pipe_info->stream_urb, GFP_ATOMIC)) {
			dev_err(&dev->udev->dev, "error submitting urb\n");
		}
	} else {
		dprintk(2, "%s :complete state 0\n", __func__);
	}
	return;
}

static int s2255_start_readpipe(struct s2255_dev *dev)
{
	int pipe;
	int retval;
	struct s2255_pipeinfo *pipe_info = &dev->pipe;
	pipe = usb_rcvbulkpipe(dev->udev, dev->read_endpoint);
	dprintk(2, "%s: IN %d\n", __func__, dev->read_endpoint);
	pipe_info->state = 1;
	pipe_info->err_count = 0;
	pipe_info->stream_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!pipe_info->stream_urb) {
		dev_err(&dev->udev->dev,
			"ReadStream: Unable to alloc URB\n");
		return -ENOMEM;
	}
	/* transfer buffer allocated in board_init */
	usb_fill_bulk_urb(pipe_info->stream_urb, dev->udev,
			  pipe,
			  pipe_info->transfer_buffer,
			  pipe_info->cur_transfer_size,
			  read_pipe_completion, pipe_info);
	retval = usb_submit_urb(pipe_info->stream_urb, GFP_KERNEL);
	if (retval) {
		printk(KERN_ERR "s2255: start read pipe failed\n");
		return retval;
	}
	return 0;
}

/* starts acquisition process */
static int s2255_start_acquire(struct s2255_channel *channel)
{
	unsigned char *buffer;
	int res;
	unsigned long chn_rev;
	int j;
	struct s2255_dev *dev = to_s2255_dev(channel->vdev.v4l2_dev);
	chn_rev = G_chnmap[channel->idx];
	buffer = kzalloc(512, GFP_KERNEL);
	if (buffer == NULL) {
		dev_err(&dev->udev->dev, "out of mem\n");
		return -ENOMEM;
	}

	channel->last_frame = -1;
	channel->bad_payload = 0;
	channel->cur_frame = 0;
	for (j = 0; j < SYS_FRAMES; j++) {
		channel->buffer.frame[j].ulState = 0;
		channel->buffer.frame[j].cur_size = 0;
	}

	/* send the start command */
	*(__le32 *) buffer = IN_DATA_TOKEN;
	*((__le32 *) buffer + 1) = (__le32) cpu_to_le32(chn_rev);
	*((__le32 *) buffer + 2) = CMD_START;
	res = s2255_write_config(dev->udev, (unsigned char *)buffer, 512);
	if (res != 0)
		dev_err(&dev->udev->dev, "CMD_START error\n");

	dprintk(2, "start acquire exit[%d] %d \n", channel->idx, res);
	kfree(buffer);
	return 0;
}

static int s2255_stop_acquire(struct s2255_channel *channel)
{
	unsigned char *buffer;
	int res;
	unsigned long chn_rev;
	struct s2255_dev *dev = to_s2255_dev(channel->vdev.v4l2_dev);
	chn_rev = G_chnmap[channel->idx];
	buffer = kzalloc(512, GFP_KERNEL);
	if (buffer == NULL) {
		dev_err(&dev->udev->dev, "out of mem\n");
		return -ENOMEM;
	}
	/* send the stop command */
	*(__le32 *) buffer = IN_DATA_TOKEN;
	*((__le32 *) buffer + 1) = (__le32) cpu_to_le32(chn_rev);
	*((__le32 *) buffer + 2) = CMD_STOP;
	res = s2255_write_config(dev->udev, (unsigned char *)buffer, 512);
	if (res != 0)
		dev_err(&dev->udev->dev, "CMD_STOP error\n");
	kfree(buffer);
	channel->b_acquire = 0;
	dprintk(4, "%s: chn %d, res %d\n", __func__, channel->idx, res);
	return res;
}

static void s2255_stop_readpipe(struct s2255_dev *dev)
{
	struct s2255_pipeinfo *pipe = &dev->pipe;

	pipe->state = 0;
	if (pipe->stream_urb) {
		/* cancel urb */
		usb_kill_urb(pipe->stream_urb);
		usb_free_urb(pipe->stream_urb);
		pipe->stream_urb = NULL;
	}
	dprintk(4, "%s", __func__);
	return;
}

static void s2255_fwload_start(struct s2255_dev *dev, int reset)
{
	if (reset)
		s2255_reset_dsppower(dev);
	dev->fw_data->fw_size = dev->fw_data->fw->size;
	atomic_set(&dev->fw_data->fw_state, S2255_FW_NOTLOADED);
	memcpy(dev->fw_data->pfw_data,
	       dev->fw_data->fw->data, CHUNK_SIZE);
	dev->fw_data->fw_loaded = CHUNK_SIZE;
	usb_fill_bulk_urb(dev->fw_data->fw_urb, dev->udev,
			  usb_sndbulkpipe(dev->udev, 2),
			  dev->fw_data->pfw_data,
			  CHUNK_SIZE, s2255_fwchunk_complete,
			  dev->fw_data);
	mod_timer(&dev->timer, jiffies + HZ);
}

/* standard usb probe function */
static int s2255_probe(struct usb_interface *interface,
		       const struct usb_device_id *id)
{
	struct s2255_dev *dev = NULL;
	struct usb_host_interface *iface_desc;
	struct usb_endpoint_descriptor *endpoint;
	int i;
	int retval = -ENOMEM;
	__le32 *pdata;
	int fw_size;
	dprintk(2, "%s\n", __func__);
	/* allocate memory for our device state and initialize it to zero */
	dev = kzalloc(sizeof(struct s2255_dev), GFP_KERNEL);
	if (dev == NULL) {
		s2255_dev_err(&interface->dev, "out of memory\n");
		return -ENOMEM;
	}
	atomic_set(&dev->num_channels, 0);
	dev->pid = id->idProduct;
	dev->fw_data = kzalloc(sizeof(struct s2255_fw), GFP_KERNEL);
	if (!dev->fw_data)
		goto errorFWDATA1;
	mutex_init(&dev->lock);
	/* grab usb_device and save it */
	dev->udev = usb_get_dev(interface_to_usbdev(interface));
	if (dev->udev == NULL) {
		dev_err(&interface->dev, "null usb device\n");
		retval = -ENODEV;
		goto errorUDEV;
	}
	dprintk(1, "dev: %p, udev %p interface %p\n", dev,
		dev->udev, interface);
	dev->interface = interface;
	/* set up the endpoint information  */
	iface_desc = interface->cur_altsetting;
	dprintk(1, "num endpoints %d\n", iface_desc->desc.bNumEndpoints);
	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
		endpoint = &iface_desc->endpoint[i].desc;
		if (!dev->read_endpoint && usb_endpoint_is_bulk_in(endpoint)) {
			/* we found the bulk in endpoint */
			dev->read_endpoint = endpoint->bEndpointAddress;
		}
	}

	if (!dev->read_endpoint) {
		dev_err(&interface->dev, "Could not find bulk-in endpoint\n");
		goto errorEP;
	}
	init_timer(&dev->timer);
	dev->timer.function = s2255_timer;
	dev->timer.data = (unsigned long)dev->fw_data;
	init_waitqueue_head(&dev->fw_data->wait_fw);
	for (i = 0; i < MAX_CHANNELS; i++) {
		struct s2255_channel *channel = &dev->channel[i];
		dev->channel[i].idx = i;
		init_waitqueue_head(&channel->wait_setmode);
		init_waitqueue_head(&channel->wait_vidstatus);
	}

	dev->fw_data->fw_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!dev->fw_data->fw_urb) {
		dev_err(&interface->dev, "out of memory!\n");
		goto errorFWURB;
	}

	dev->fw_data->pfw_data = kzalloc(CHUNK_SIZE, GFP_KERNEL);
	if (!dev->fw_data->pfw_data) {
		dev_err(&interface->dev, "out of memory!\n");
		goto errorFWDATA2;
	}
	/* load the first chunk */
	if (request_firmware(&dev->fw_data->fw,
			     FIRMWARE_FILE_NAME, &dev->udev->dev)) {
		printk(KERN_ERR "sensoray 2255 failed to get firmware\n");
		goto errorREQFW;
	}
	/* check the firmware is valid */
	fw_size = dev->fw_data->fw->size;
	pdata = (__le32 *) &dev->fw_data->fw->data[fw_size - 8];

	if (*pdata != S2255_FW_MARKER) {
		printk(KERN_INFO "Firmware invalid.\n");
		retval = -ENODEV;
		goto errorFWMARKER;
	} else {
		/* make sure firmware is the latest */
		__le32 *pRel;
		pRel = (__le32 *) &dev->fw_data->fw->data[fw_size - 4];
		printk(KERN_INFO "s2255 dsp fw version %x\n", *pRel);
		dev->dsp_fw_ver = le32_to_cpu(*pRel);
		if (dev->dsp_fw_ver < S2255_CUR_DSP_FWVER)
			printk(KERN_INFO "s2255: f2255usb.bin out of date.\n");
		if (dev->pid == 0x2257 &&
				dev->dsp_fw_ver < S2255_MIN_DSP_COLORFILTER)
			printk(KERN_WARNING "s2255: 2257 requires firmware %d"
			       " or above.\n", S2255_MIN_DSP_COLORFILTER);
	}
	usb_reset_device(dev->udev);
	/* load 2255 board specific */
	retval = s2255_board_init(dev);
	if (retval)
		goto errorBOARDINIT;
	spin_lock_init(&dev->slock);
	s2255_fwload_start(dev, 0);
	/* loads v4l specific */
	retval = s2255_probe_v4l(dev);
	if (retval)
		goto errorBOARDINIT;
	dev_info(&interface->dev, "Sensoray 2255 detected\n");
	return 0;
errorBOARDINIT:
	s2255_board_shutdown(dev);
errorFWMARKER:
	release_firmware(dev->fw_data->fw);
errorREQFW:
	kfree(dev->fw_data->pfw_data);
errorFWDATA2:
	usb_free_urb(dev->fw_data->fw_urb);
errorFWURB:
	del_timer(&dev->timer);
errorEP:
	usb_put_dev(dev->udev);
errorUDEV:
	kfree(dev->fw_data);
	mutex_destroy(&dev->lock);
errorFWDATA1:
	kfree(dev);
	printk(KERN_WARNING "Sensoray 2255 driver load failed: 0x%x\n", retval);
	return retval;
}

/* disconnect routine. when board is removed physically or with rmmod */
static void s2255_disconnect(struct usb_interface *interface)
{
	struct s2255_dev *dev = to_s2255_dev(usb_get_intfdata(interface));
	int i;
	int channels = atomic_read(&dev->num_channels);
	mutex_lock(&dev->lock);
	v4l2_device_disconnect(&dev->v4l2_dev);
	mutex_unlock(&dev->lock);
	/*see comments in the uvc_driver.c usb disconnect function */
	atomic_inc(&dev->num_channels);
	/* unregister each video device. */
	for (i = 0; i < channels; i++)
		video_unregister_device(&dev->channel[i].vdev);
	/* wake up any of our timers */
	atomic_set(&dev->fw_data->fw_state, S2255_FW_DISCONNECTING);
	wake_up(&dev->fw_data->wait_fw);
	for (i = 0; i < MAX_CHANNELS; i++) {
		dev->channel[i].setmode_ready = 1;
		wake_up(&dev->channel[i].wait_setmode);
		dev->channel[i].vidstatus_ready = 1;
		wake_up(&dev->channel[i].wait_vidstatus);
	}
	if (atomic_dec_and_test(&dev->num_channels))
		s2255_destroy(dev);
	dev_info(&interface->dev, "%s\n", __func__);
}

static struct usb_driver s2255_driver = {
	.name = S2255_DRIVER_NAME,
	.probe = s2255_probe,
	.disconnect = s2255_disconnect,
	.id_table = s2255_table,
};

module_usb_driver(s2255_driver);

MODULE_DESCRIPTION("Sensoray 2255 Video for Linux driver");
MODULE_AUTHOR("Dean Anderson (Sensoray Company Inc.)");
MODULE_LICENSE("GPL");
MODULE_VERSION(S2255_VERSION);
MODULE_FIRMWARE(FIRMWARE_FILE_NAME);