summaryrefslogtreecommitdiff
path: root/drivers/media/usb/usbvision/usbvision-core.c
blob: f05a5c84dc188f74891ee2f75249cbea864e5e86 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * usbvision-core.c - driver for NT100x USB video capture devices
 *
 * Copyright (c) 1999-2005 Joerg Heckenbach <joerg@heckenbach-aw.de>
 *                         Dwaine Garden <dwainegarden@rogers.com>
 *
 * This module is part of usbvision driver project.
 * Updates to driver completed by Dwaine P. Garden
 */

#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/gfp.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/videodev2.h>
#include <linux/i2c.h>

#include <media/i2c/saa7115.h>
#include <media/v4l2-common.h>
#include <media/tuner.h>

#include <linux/workqueue.h>

#include "usbvision.h"

static unsigned int core_debug;
module_param(core_debug, int, 0644);
MODULE_PARM_DESC(core_debug, "enable debug messages [core]");

static int adjust_compression = 1;	/* Set the compression to be adaptive */
module_param(adjust_compression, int, 0444);
MODULE_PARM_DESC(adjust_compression, " Set the ADPCM compression for the device.  Default: 1 (On)");

/* To help people with Black and White output with using s-video input.
 * Some cables and input device are wired differently. */
static int switch_svideo_input;
module_param(switch_svideo_input, int, 0444);
MODULE_PARM_DESC(switch_svideo_input, " Set the S-Video input.  Some cables and input device are wired differently. Default: 0 (Off)");

static unsigned int adjust_x_offset = -1;
module_param(adjust_x_offset, int, 0644);
MODULE_PARM_DESC(adjust_x_offset, "adjust X offset display [core]");

static unsigned int adjust_y_offset = -1;
module_param(adjust_y_offset, int, 0644);
MODULE_PARM_DESC(adjust_y_offset, "adjust Y offset display [core]");


#define	ENABLE_HEXDUMP	0	/* Enable if you need it */


#ifdef USBVISION_DEBUG
	#define PDEBUG(level, fmt, args...) { \
		if (core_debug & (level)) \
			printk(KERN_INFO KBUILD_MODNAME ":[%s:%d] " fmt, \
				__func__, __LINE__ , ## args); \
	}
#else
	#define PDEBUG(level, fmt, args...) do {} while (0)
#endif

#define DBG_HEADER	(1 << 0)
#define DBG_IRQ		(1 << 1)
#define DBG_ISOC	(1 << 2)
#define DBG_PARSE	(1 << 3)
#define DBG_SCRATCH	(1 << 4)
#define DBG_FUNC	(1 << 5)

/* The value of 'scratch_buf_size' affects quality of the picture
 * in many ways. Shorter buffers may cause loss of data when client
 * is too slow. Larger buffers are memory-consuming and take longer
 * to work with. This setting can be adjusted, but the default value
 * should be OK for most desktop users.
 */
#define DEFAULT_SCRATCH_BUF_SIZE	(0x20000)		/* 128kB memory scratch buffer */
static const int scratch_buf_size = DEFAULT_SCRATCH_BUF_SIZE;

/* Function prototypes */
static int usbvision_request_intra(struct usb_usbvision *usbvision);
static int usbvision_unrequest_intra(struct usb_usbvision *usbvision);
static int usbvision_adjust_compression(struct usb_usbvision *usbvision);
static int usbvision_measure_bandwidth(struct usb_usbvision *usbvision);

/*******************************/
/* Memory management functions */
/*******************************/

/*
 * Here we want the physical address of the memory.
 * This is used when initializing the contents of the area.
 */

static void *usbvision_rvmalloc(unsigned long size)
{
	void *mem;
	unsigned long adr;

	size = PAGE_ALIGN(size);
	mem = vmalloc_32(size);
	if (!mem)
		return NULL;

	memset(mem, 0, size); /* Clear the ram out, no junk to the user */
	adr = (unsigned long) mem;
	while (size > 0) {
		SetPageReserved(vmalloc_to_page((void *)adr));
		adr += PAGE_SIZE;
		size -= PAGE_SIZE;
	}

	return mem;
}

static void usbvision_rvfree(void *mem, unsigned long size)
{
	unsigned long adr;

	if (!mem)
		return;

	size = PAGE_ALIGN(size);

	adr = (unsigned long) mem;
	while ((long) size > 0) {
		ClearPageReserved(vmalloc_to_page((void *)adr));
		adr += PAGE_SIZE;
		size -= PAGE_SIZE;
	}

	vfree(mem);
}


#if ENABLE_HEXDUMP
static void usbvision_hexdump(const unsigned char *data, int len)
{
	char tmp[80];
	int i, k;

	for (i = k = 0; len > 0; i++, len--) {
		if (i > 0 && (i % 16 == 0)) {
			printk("%s\n", tmp);
			k = 0;
		}
		k += sprintf(&tmp[k], "%02x ", data[i]);
	}
	if (k > 0)
		printk(KERN_CONT "%s\n", tmp);
}
#endif

/********************************
 * scratch ring buffer handling
 ********************************/
static int scratch_len(struct usb_usbvision *usbvision)    /* This returns the amount of data actually in the buffer */
{
	int len = usbvision->scratch_write_ptr - usbvision->scratch_read_ptr;

	if (len < 0)
		len += scratch_buf_size;
	PDEBUG(DBG_SCRATCH, "scratch_len() = %d\n", len);

	return len;
}


/* This returns the free space left in the buffer */
static int scratch_free(struct usb_usbvision *usbvision)
{
	int free = usbvision->scratch_read_ptr - usbvision->scratch_write_ptr;
	if (free <= 0)
		free += scratch_buf_size;
	if (free) {
		free -= 1;							/* at least one byte in the buffer must */
										/* left blank, otherwise there is no chance to differ between full and empty */
	}
	PDEBUG(DBG_SCRATCH, "return %d\n", free);

	return free;
}


/* This puts data into the buffer */
static int scratch_put(struct usb_usbvision *usbvision, unsigned char *data,
		       int len)
{
	int len_part;

	if (usbvision->scratch_write_ptr + len < scratch_buf_size) {
		memcpy(usbvision->scratch + usbvision->scratch_write_ptr, data, len);
		usbvision->scratch_write_ptr += len;
	} else {
		len_part = scratch_buf_size - usbvision->scratch_write_ptr;
		memcpy(usbvision->scratch + usbvision->scratch_write_ptr, data, len_part);
		if (len == len_part) {
			usbvision->scratch_write_ptr = 0;			/* just set write_ptr to zero */
		} else {
			memcpy(usbvision->scratch, data + len_part, len - len_part);
			usbvision->scratch_write_ptr = len - len_part;
		}
	}

	PDEBUG(DBG_SCRATCH, "len=%d, new write_ptr=%d\n", len, usbvision->scratch_write_ptr);

	return len;
}

/* This marks the write_ptr as position of new frame header */
static void scratch_mark_header(struct usb_usbvision *usbvision)
{
	PDEBUG(DBG_SCRATCH, "header at write_ptr=%d\n", usbvision->scratch_headermarker_write_ptr);

	usbvision->scratch_headermarker[usbvision->scratch_headermarker_write_ptr] =
				usbvision->scratch_write_ptr;
	usbvision->scratch_headermarker_write_ptr += 1;
	usbvision->scratch_headermarker_write_ptr %= USBVISION_NUM_HEADERMARKER;
}

/* This gets data from the buffer at the given "ptr" position */
static int scratch_get_extra(struct usb_usbvision *usbvision,
			     unsigned char *data, int *ptr, int len)
{
	int len_part;

	if (*ptr + len < scratch_buf_size) {
		memcpy(data, usbvision->scratch + *ptr, len);
		*ptr += len;
	} else {
		len_part = scratch_buf_size - *ptr;
		memcpy(data, usbvision->scratch + *ptr, len_part);
		if (len == len_part) {
			*ptr = 0;							/* just set the y_ptr to zero */
		} else {
			memcpy(data + len_part, usbvision->scratch, len - len_part);
			*ptr = len - len_part;
		}
	}

	PDEBUG(DBG_SCRATCH, "len=%d, new ptr=%d\n", len, *ptr);

	return len;
}


/* This sets the scratch extra read pointer */
static void scratch_set_extra_ptr(struct usb_usbvision *usbvision, int *ptr,
				  int len)
{
	*ptr = (usbvision->scratch_read_ptr + len) % scratch_buf_size;

	PDEBUG(DBG_SCRATCH, "ptr=%d\n", *ptr);
}


/* This increments the scratch extra read pointer */
static void scratch_inc_extra_ptr(int *ptr, int len)
{
	*ptr = (*ptr + len) % scratch_buf_size;

	PDEBUG(DBG_SCRATCH, "ptr=%d\n", *ptr);
}


/* This gets data from the buffer */
static int scratch_get(struct usb_usbvision *usbvision, unsigned char *data,
		       int len)
{
	int len_part;

	if (usbvision->scratch_read_ptr + len < scratch_buf_size) {
		memcpy(data, usbvision->scratch + usbvision->scratch_read_ptr, len);
		usbvision->scratch_read_ptr += len;
	} else {
		len_part = scratch_buf_size - usbvision->scratch_read_ptr;
		memcpy(data, usbvision->scratch + usbvision->scratch_read_ptr, len_part);
		if (len == len_part) {
			usbvision->scratch_read_ptr = 0;				/* just set the read_ptr to zero */
		} else {
			memcpy(data + len_part, usbvision->scratch, len - len_part);
			usbvision->scratch_read_ptr = len - len_part;
		}
	}

	PDEBUG(DBG_SCRATCH, "len=%d, new read_ptr=%d\n", len, usbvision->scratch_read_ptr);

	return len;
}


/* This sets read pointer to next header and returns it */
static int scratch_get_header(struct usb_usbvision *usbvision,
			      struct usbvision_frame_header *header)
{
	int err_code = 0;

	PDEBUG(DBG_SCRATCH, "from read_ptr=%d", usbvision->scratch_headermarker_read_ptr);

	while (usbvision->scratch_headermarker_write_ptr -
		usbvision->scratch_headermarker_read_ptr != 0) {
		usbvision->scratch_read_ptr =
			usbvision->scratch_headermarker[usbvision->scratch_headermarker_read_ptr];
		usbvision->scratch_headermarker_read_ptr += 1;
		usbvision->scratch_headermarker_read_ptr %= USBVISION_NUM_HEADERMARKER;
		scratch_get(usbvision, (unsigned char *)header, USBVISION_HEADER_LENGTH);
		if ((header->magic_1 == USBVISION_MAGIC_1)
			 && (header->magic_2 == USBVISION_MAGIC_2)
			 && (header->header_length == USBVISION_HEADER_LENGTH)) {
			err_code = USBVISION_HEADER_LENGTH;
			header->frame_width  = header->frame_width_lo  + (header->frame_width_hi << 8);
			header->frame_height = header->frame_height_lo + (header->frame_height_hi << 8);
			break;
		}
	}

	return err_code;
}


/* This removes len bytes of old data from the buffer */
static void scratch_rm_old(struct usb_usbvision *usbvision, int len)
{
	usbvision->scratch_read_ptr += len;
	usbvision->scratch_read_ptr %= scratch_buf_size;
	PDEBUG(DBG_SCRATCH, "read_ptr is now %d\n", usbvision->scratch_read_ptr);
}


/* This resets the buffer - kills all data in it too */
static void scratch_reset(struct usb_usbvision *usbvision)
{
	PDEBUG(DBG_SCRATCH, "\n");

	usbvision->scratch_read_ptr = 0;
	usbvision->scratch_write_ptr = 0;
	usbvision->scratch_headermarker_read_ptr = 0;
	usbvision->scratch_headermarker_write_ptr = 0;
	usbvision->isocstate = isoc_state_no_frame;
}

int usbvision_scratch_alloc(struct usb_usbvision *usbvision)
{
	usbvision->scratch = vmalloc_32(scratch_buf_size);
	scratch_reset(usbvision);
	if (usbvision->scratch == NULL) {
		dev_err(&usbvision->dev->dev,
			"%s: unable to allocate %d bytes for scratch\n",
				__func__, scratch_buf_size);
		return -ENOMEM;
	}
	return 0;
}

void usbvision_scratch_free(struct usb_usbvision *usbvision)
{
	vfree(usbvision->scratch);
	usbvision->scratch = NULL;
}

/*
 * usbvision_decompress_alloc()
 *
 * allocates intermediate buffer for decompression
 */
int usbvision_decompress_alloc(struct usb_usbvision *usbvision)
{
	int IFB_size = MAX_FRAME_WIDTH * MAX_FRAME_HEIGHT * 3 / 2;

	usbvision->intra_frame_buffer = vmalloc_32(IFB_size);
	if (usbvision->intra_frame_buffer == NULL) {
		dev_err(&usbvision->dev->dev,
			"%s: unable to allocate %d for compr. frame buffer\n",
				__func__, IFB_size);
		return -ENOMEM;
	}
	return 0;
}

/*
 * usbvision_decompress_free()
 *
 * frees intermediate buffer for decompression
 */
void usbvision_decompress_free(struct usb_usbvision *usbvision)
{
	vfree(usbvision->intra_frame_buffer);
	usbvision->intra_frame_buffer = NULL;

}

/************************************************************
 * Here comes the data parsing stuff that is run as interrupt
 ************************************************************/
/*
 * usbvision_find_header()
 *
 * Locate one of supported header markers in the scratch buffer.
 */
static enum parse_state usbvision_find_header(struct usb_usbvision *usbvision)
{
	struct usbvision_frame *frame;
	int found_header = 0;

	frame = usbvision->cur_frame;

	while (scratch_get_header(usbvision, &frame->isoc_header) == USBVISION_HEADER_LENGTH) {
		/* found header in scratch */
		PDEBUG(DBG_HEADER, "found header: 0x%02x%02x %d %d %d %d %#x 0x%02x %u %u",
				frame->isoc_header.magic_2,
				frame->isoc_header.magic_1,
				frame->isoc_header.header_length,
				frame->isoc_header.frame_num,
				frame->isoc_header.frame_phase,
				frame->isoc_header.frame_latency,
				frame->isoc_header.data_format,
				frame->isoc_header.format_param,
				frame->isoc_header.frame_width,
				frame->isoc_header.frame_height);

		if (usbvision->request_intra) {
			if (frame->isoc_header.format_param & 0x80) {
				found_header = 1;
				usbvision->last_isoc_frame_num = -1; /* do not check for lost frames this time */
				usbvision_unrequest_intra(usbvision);
				break;
			}
		} else {
			found_header = 1;
			break;
		}
	}

	if (found_header) {
		frame->frmwidth = frame->isoc_header.frame_width * usbvision->stretch_width;
		frame->frmheight = frame->isoc_header.frame_height * usbvision->stretch_height;
		frame->v4l2_linesize = (frame->frmwidth * frame->v4l2_format.depth) >> 3;
	} else { /* no header found */
		PDEBUG(DBG_HEADER, "skipping scratch data, no header");
		scratch_reset(usbvision);
		return parse_state_end_parse;
	}

	/* found header */
	if (frame->isoc_header.data_format == ISOC_MODE_COMPRESS) {
		/* check isoc_header.frame_num for lost frames */
		if (usbvision->last_isoc_frame_num >= 0) {
			if (((usbvision->last_isoc_frame_num + 1) % 32) != frame->isoc_header.frame_num) {
				/* unexpected frame drop: need to request new intra frame */
				PDEBUG(DBG_HEADER, "Lost frame before %d on USB", frame->isoc_header.frame_num);
				usbvision_request_intra(usbvision);
				return parse_state_next_frame;
			}
		}
		usbvision->last_isoc_frame_num = frame->isoc_header.frame_num;
	}
	usbvision->header_count++;
	frame->scanstate = scan_state_lines;
	frame->curline = 0;

	return parse_state_continue;
}

static enum parse_state usbvision_parse_lines_422(struct usb_usbvision *usbvision,
					   long *pcopylen)
{
	volatile struct usbvision_frame *frame;
	unsigned char *f;
	int len;
	int i;
	unsigned char yuyv[4] = { 180, 128, 10, 128 }; /* YUV components */
	unsigned char rv, gv, bv;	/* RGB components */
	int clipmask_index, bytes_per_pixel;
	int stretch_bytes, clipmask_add;

	frame  = usbvision->cur_frame;
	f = frame->data + (frame->v4l2_linesize * frame->curline);

	/* Make sure there's enough data for the entire line */
	len = (frame->isoc_header.frame_width * 2) + 5;
	if (scratch_len(usbvision) < len) {
		PDEBUG(DBG_PARSE, "out of data in line %d, need %u.\n", frame->curline, len);
		return parse_state_out;
	}

	if ((frame->curline + 1) >= frame->frmheight)
		return parse_state_next_frame;

	bytes_per_pixel = frame->v4l2_format.bytes_per_pixel;
	stretch_bytes = (usbvision->stretch_width - 1) * bytes_per_pixel;
	clipmask_index = frame->curline * MAX_FRAME_WIDTH;
	clipmask_add = usbvision->stretch_width;

	for (i = 0; i < frame->frmwidth; i += (2 * usbvision->stretch_width)) {
		scratch_get(usbvision, &yuyv[0], 4);

		if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
			*f++ = yuyv[0]; /* Y */
			*f++ = yuyv[3]; /* U */
		} else {
			YUV_TO_RGB_BY_THE_BOOK(yuyv[0], yuyv[1], yuyv[3], rv, gv, bv);
			switch (frame->v4l2_format.format) {
			case V4L2_PIX_FMT_RGB565:
				*f++ = (0x1F & rv) |
					(0xE0 & (gv << 5));
				*f++ = (0x07 & (gv >> 3)) |
					(0xF8 &  bv);
				break;
			case V4L2_PIX_FMT_RGB24:
				*f++ = rv;
				*f++ = gv;
				*f++ = bv;
				break;
			case V4L2_PIX_FMT_RGB32:
				*f++ = rv;
				*f++ = gv;
				*f++ = bv;
				f++;
				break;
			case V4L2_PIX_FMT_RGB555:
				*f++ = (0x1F & rv) |
					(0xE0 & (gv << 5));
				*f++ = (0x03 & (gv >> 3)) |
					(0x7C & (bv << 2));
				break;
			}
		}
		clipmask_index += clipmask_add;
		f += stretch_bytes;

		if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
			*f++ = yuyv[2]; /* Y */
			*f++ = yuyv[1]; /* V */
		} else {
			YUV_TO_RGB_BY_THE_BOOK(yuyv[2], yuyv[1], yuyv[3], rv, gv, bv);
			switch (frame->v4l2_format.format) {
			case V4L2_PIX_FMT_RGB565:
				*f++ = (0x1F & rv) |
					(0xE0 & (gv << 5));
				*f++ = (0x07 & (gv >> 3)) |
					(0xF8 &  bv);
				break;
			case V4L2_PIX_FMT_RGB24:
				*f++ = rv;
				*f++ = gv;
				*f++ = bv;
				break;
			case V4L2_PIX_FMT_RGB32:
				*f++ = rv;
				*f++ = gv;
				*f++ = bv;
				f++;
				break;
			case V4L2_PIX_FMT_RGB555:
				*f++ = (0x1F & rv) |
					(0xE0 & (gv << 5));
				*f++ = (0x03 & (gv >> 3)) |
					(0x7C & (bv << 2));
				break;
			}
		}
		clipmask_index += clipmask_add;
		f += stretch_bytes;
	}

	frame->curline += usbvision->stretch_height;
	*pcopylen += frame->v4l2_linesize * usbvision->stretch_height;

	if (frame->curline >= frame->frmheight)
		return parse_state_next_frame;
	return parse_state_continue;
}

/* The decompression routine  */
static int usbvision_decompress(struct usb_usbvision *usbvision, unsigned char *compressed,
								unsigned char *decompressed, int *start_pos,
								int *block_typestart_pos, int len)
{
	int rest_pixel, idx, pos, extra_pos, block_len, block_type_pos, block_type_len;
	unsigned char block_byte, block_code, block_type, block_type_byte, integrator;

	integrator = 0;
	pos = *start_pos;
	block_type_pos = *block_typestart_pos;
	extra_pos = pos;
	block_len = 0;
	block_byte = 0;
	block_code = 0;
	block_type = 0;
	block_type_byte = 0;
	block_type_len = 0;
	rest_pixel = len;

	for (idx = 0; idx < len; idx++) {
		if (block_len == 0) {
			if (block_type_len == 0) {
				block_type_byte = compressed[block_type_pos];
				block_type_pos++;
				block_type_len = 4;
			}
			block_type = (block_type_byte & 0xC0) >> 6;

			/* statistic: */
			usbvision->compr_block_types[block_type]++;

			pos = extra_pos;
			if (block_type == 0) {
				if (rest_pixel >= 24) {
					idx += 23;
					rest_pixel -= 24;
					integrator = decompressed[idx];
				} else {
					idx += rest_pixel - 1;
					rest_pixel = 0;
				}
			} else {
				block_code = compressed[pos];
				pos++;
				if (rest_pixel >= 24)
					block_len  = 24;
				else
					block_len = rest_pixel;
				rest_pixel -= block_len;
				extra_pos = pos + (block_len / 4);
			}
			block_type_byte <<= 2;
			block_type_len -= 1;
		}
		if (block_len > 0) {
			if ((block_len % 4) == 0) {
				block_byte = compressed[pos];
				pos++;
			}
			if (block_type == 1) /* inter Block */
				integrator = decompressed[idx];
			switch (block_byte & 0xC0) {
			case 0x03 << 6:
				integrator += compressed[extra_pos];
				extra_pos++;
				break;
			case 0x02 << 6:
				integrator += block_code;
				break;
			case 0x00:
				integrator -= block_code;
				break;
			}
			decompressed[idx] = integrator;
			block_byte <<= 2;
			block_len -= 1;
		}
	}
	*start_pos = extra_pos;
	*block_typestart_pos = block_type_pos;
	return idx;
}


/*
 * usbvision_parse_compress()
 *
 * Parse compressed frame from the scratch buffer, put
 * decoded RGB value into the current frame buffer and add the written
 * number of bytes (RGB) to the *pcopylen.
 *
 */
static enum parse_state usbvision_parse_compress(struct usb_usbvision *usbvision,
					   long *pcopylen)
{
#define USBVISION_STRIP_MAGIC		0x5A
#define USBVISION_STRIP_LEN_MAX		400
#define USBVISION_STRIP_HEADER_LEN	3

	struct usbvision_frame *frame;
	unsigned char *f, *u = NULL, *v = NULL;
	unsigned char strip_data[USBVISION_STRIP_LEN_MAX];
	unsigned char strip_header[USBVISION_STRIP_HEADER_LEN];
	int idx, idx_end, strip_len, strip_ptr, startblock_pos, block_pos, block_type_pos;
	int clipmask_index;
	int image_size;
	unsigned char rv, gv, bv;
	static unsigned char *Y, *U, *V;

	frame = usbvision->cur_frame;
	image_size = frame->frmwidth * frame->frmheight;
	if ((frame->v4l2_format.format == V4L2_PIX_FMT_YUV422P) ||
	    (frame->v4l2_format.format == V4L2_PIX_FMT_YVU420)) {       /* this is a planar format */
		/* ... v4l2_linesize not used here. */
		f = frame->data + (frame->width * frame->curline);
	} else
		f = frame->data + (frame->v4l2_linesize * frame->curline);

	if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) { /* initialise u and v pointers */
		/* get base of u and b planes add halfoffset */
		u = frame->data
			+ image_size
			+ (frame->frmwidth >> 1) * frame->curline;
		v = u + (image_size >> 1);
	} else if (frame->v4l2_format.format == V4L2_PIX_FMT_YVU420) {
		v = frame->data + image_size + ((frame->curline * (frame->width)) >> 2);
		u = v + (image_size >> 2);
	}

	if (frame->curline == 0)
		usbvision_adjust_compression(usbvision);

	if (scratch_len(usbvision) < USBVISION_STRIP_HEADER_LEN)
		return parse_state_out;

	/* get strip header without changing the scratch_read_ptr */
	scratch_set_extra_ptr(usbvision, &strip_ptr, 0);
	scratch_get_extra(usbvision, &strip_header[0], &strip_ptr,
				USBVISION_STRIP_HEADER_LEN);

	if (strip_header[0] != USBVISION_STRIP_MAGIC) {
		/* wrong strip magic */
		usbvision->strip_magic_errors++;
		return parse_state_next_frame;
	}

	if (frame->curline != (int)strip_header[2]) {
		/* line number mismatch error */
		usbvision->strip_line_number_errors++;
	}

	strip_len = 2 * (unsigned int)strip_header[1];
	if (strip_len > USBVISION_STRIP_LEN_MAX) {
		/* strip overrun */
		/* I think this never happens */
		usbvision_request_intra(usbvision);
	}

	if (scratch_len(usbvision) < strip_len) {
		/* there is not enough data for the strip */
		return parse_state_out;
	}

	if (usbvision->intra_frame_buffer) {
		Y = usbvision->intra_frame_buffer + frame->frmwidth * frame->curline;
		U = usbvision->intra_frame_buffer + image_size + (frame->frmwidth / 2) * (frame->curline / 2);
		V = usbvision->intra_frame_buffer + image_size / 4 * 5 + (frame->frmwidth / 2) * (frame->curline / 2);
	} else {
		return parse_state_next_frame;
	}

	clipmask_index = frame->curline * MAX_FRAME_WIDTH;

	scratch_get(usbvision, strip_data, strip_len);

	idx_end = frame->frmwidth;
	block_type_pos = USBVISION_STRIP_HEADER_LEN;
	startblock_pos = block_type_pos + (idx_end - 1) / 96 + (idx_end / 2 - 1) / 96 + 2;
	block_pos = startblock_pos;

	usbvision->block_pos = block_pos;

	usbvision_decompress(usbvision, strip_data, Y, &block_pos, &block_type_pos, idx_end);
	if (strip_len > usbvision->max_strip_len)
		usbvision->max_strip_len = strip_len;

	if (frame->curline % 2)
		usbvision_decompress(usbvision, strip_data, V, &block_pos, &block_type_pos, idx_end / 2);
	else
		usbvision_decompress(usbvision, strip_data, U, &block_pos, &block_type_pos, idx_end / 2);

	if (block_pos > usbvision->comprblock_pos)
		usbvision->comprblock_pos = block_pos;
	if (block_pos > strip_len)
		usbvision->strip_len_errors++;

	for (idx = 0; idx < idx_end; idx++) {
		if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
			*f++ = Y[idx];
			*f++ = idx & 0x01 ? U[idx / 2] : V[idx / 2];
		} else if (frame->v4l2_format.format == V4L2_PIX_FMT_YUV422P) {
			*f++ = Y[idx];
			if (idx & 0x01)
				*u++ = U[idx >> 1];
			else
				*v++ = V[idx >> 1];
		} else if (frame->v4l2_format.format == V4L2_PIX_FMT_YVU420) {
			*f++ = Y[idx];
			if (!((idx & 0x01) | (frame->curline & 0x01))) {
				/* only need do this for 1 in 4 pixels */
				/* intraframe buffer is YUV420 format */
				*u++ = U[idx >> 1];
				*v++ = V[idx >> 1];
			}
		} else {
			YUV_TO_RGB_BY_THE_BOOK(Y[idx], U[idx / 2], V[idx / 2], rv, gv, bv);
			switch (frame->v4l2_format.format) {
			case V4L2_PIX_FMT_GREY:
				*f++ = Y[idx];
				break;
			case V4L2_PIX_FMT_RGB555:
				*f++ = (0x1F & rv) |
					(0xE0 & (gv << 5));
				*f++ = (0x03 & (gv >> 3)) |
					(0x7C & (bv << 2));
				break;
			case V4L2_PIX_FMT_RGB565:
				*f++ = (0x1F & rv) |
					(0xE0 & (gv << 5));
				*f++ = (0x07 & (gv >> 3)) |
					(0xF8 & bv);
				break;
			case V4L2_PIX_FMT_RGB24:
				*f++ = rv;
				*f++ = gv;
				*f++ = bv;
				break;
			case V4L2_PIX_FMT_RGB32:
				*f++ = rv;
				*f++ = gv;
				*f++ = bv;
				f++;
				break;
			}
		}
		clipmask_index++;
	}
	/* Deal with non-integer no. of bytes for YUV420P */
	if (frame->v4l2_format.format != V4L2_PIX_FMT_YVU420)
		*pcopylen += frame->v4l2_linesize;
	else
		*pcopylen += frame->curline & 0x01 ? frame->v4l2_linesize : frame->v4l2_linesize << 1;

	frame->curline += 1;

	if (frame->curline >= frame->frmheight)
		return parse_state_next_frame;
	return parse_state_continue;

}


/*
 * usbvision_parse_lines_420()
 *
 * Parse two lines from the scratch buffer, put
 * decoded RGB value into the current frame buffer and add the written
 * number of bytes (RGB) to the *pcopylen.
 *
 */
static enum parse_state usbvision_parse_lines_420(struct usb_usbvision *usbvision,
					   long *pcopylen)
{
	struct usbvision_frame *frame;
	unsigned char *f_even = NULL, *f_odd = NULL;
	unsigned int pixel_per_line, block;
	int pixel, block_split;
	int y_ptr, u_ptr, v_ptr, y_odd_offset;
	const int y_block_size = 128;
	const int uv_block_size = 64;
	const int sub_block_size = 32;
	const int y_step[] = { 0, 0, 0, 2 }, y_step_size = 4;
	const int uv_step[] = { 0, 0, 0, 4 }, uv_step_size = 4;
	unsigned char y[2], u, v;	/* YUV components */
	int y_, u_, v_, vb, uvg, ur;
	int r_, g_, b_;			/* RGB components */
	unsigned char g;
	int clipmask_even_index, clipmask_odd_index, bytes_per_pixel;
	int clipmask_add, stretch_bytes;

	frame  = usbvision->cur_frame;
	f_even = frame->data + (frame->v4l2_linesize * frame->curline);
	f_odd  = f_even + frame->v4l2_linesize * usbvision->stretch_height;

	/* Make sure there's enough data for the entire line */
	/* In this mode usbvision transfer 3 bytes for every 2 pixels */
	/* I need two lines to decode the color */
	bytes_per_pixel = frame->v4l2_format.bytes_per_pixel;
	stretch_bytes = (usbvision->stretch_width - 1) * bytes_per_pixel;
	clipmask_even_index = frame->curline * MAX_FRAME_WIDTH;
	clipmask_odd_index  = clipmask_even_index + MAX_FRAME_WIDTH;
	clipmask_add = usbvision->stretch_width;
	pixel_per_line = frame->isoc_header.frame_width;

	if (scratch_len(usbvision) < (int)pixel_per_line * 3) {
		/* printk(KERN_DEBUG "out of data, need %d\n", len); */
		return parse_state_out;
	}

	if ((frame->curline + 1) >= frame->frmheight)
		return parse_state_next_frame;

	block_split = (pixel_per_line%y_block_size) ? 1 : 0;	/* are some blocks split into different lines? */

	y_odd_offset = (pixel_per_line / y_block_size) * (y_block_size + uv_block_size)
			+ block_split * uv_block_size;

	scratch_set_extra_ptr(usbvision, &y_ptr, y_odd_offset);
	scratch_set_extra_ptr(usbvision, &u_ptr, y_block_size);
	scratch_set_extra_ptr(usbvision, &v_ptr, y_odd_offset
			+ (4 - block_split) * sub_block_size);

	for (block = 0; block < (pixel_per_line / sub_block_size); block++) {
		for (pixel = 0; pixel < sub_block_size; pixel += 2) {
			scratch_get(usbvision, &y[0], 2);
			scratch_get_extra(usbvision, &u, &u_ptr, 1);
			scratch_get_extra(usbvision, &v, &v_ptr, 1);

			/* I don't use the YUV_TO_RGB macro for better performance */
			v_ = v - 128;
			u_ = u - 128;
			vb = 132252 * v_;
			uvg = -53281 * u_ - 25625 * v_;
			ur = 104595 * u_;

			if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
				*f_even++ = y[0];
				*f_even++ = v;
			} else {
				y_ = 76284 * (y[0] - 16);

				b_ = (y_ + vb) >> 16;
				g_ = (y_ + uvg) >> 16;
				r_ = (y_ + ur) >> 16;

				switch (frame->v4l2_format.format) {
				case V4L2_PIX_FMT_RGB565:
					g = LIMIT_RGB(g_);
					*f_even++ =
						(0x1F & LIMIT_RGB(r_)) |
						(0xE0 & (g << 5));
					*f_even++ =
						(0x07 & (g >> 3)) |
						(0xF8 &  LIMIT_RGB(b_));
					break;
				case V4L2_PIX_FMT_RGB24:
					*f_even++ = LIMIT_RGB(r_);
					*f_even++ = LIMIT_RGB(g_);
					*f_even++ = LIMIT_RGB(b_);
					break;
				case V4L2_PIX_FMT_RGB32:
					*f_even++ = LIMIT_RGB(r_);
					*f_even++ = LIMIT_RGB(g_);
					*f_even++ = LIMIT_RGB(b_);
					f_even++;
					break;
				case V4L2_PIX_FMT_RGB555:
					g = LIMIT_RGB(g_);
					*f_even++ = (0x1F & LIMIT_RGB(r_)) |
						(0xE0 & (g << 5));
					*f_even++ = (0x03 & (g >> 3)) |
						(0x7C & (LIMIT_RGB(b_) << 2));
					break;
				}
			}
			clipmask_even_index += clipmask_add;
			f_even += stretch_bytes;

			if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
				*f_even++ = y[1];
				*f_even++ = u;
			} else {
				y_ = 76284 * (y[1] - 16);

				b_ = (y_ + vb) >> 16;
				g_ = (y_ + uvg) >> 16;
				r_ = (y_ + ur) >> 16;

				switch (frame->v4l2_format.format) {
				case V4L2_PIX_FMT_RGB565:
					g = LIMIT_RGB(g_);
					*f_even++ =
						(0x1F & LIMIT_RGB(r_)) |
						(0xE0 & (g << 5));
					*f_even++ =
						(0x07 & (g >> 3)) |
						(0xF8 &  LIMIT_RGB(b_));
					break;
				case V4L2_PIX_FMT_RGB24:
					*f_even++ = LIMIT_RGB(r_);
					*f_even++ = LIMIT_RGB(g_);
					*f_even++ = LIMIT_RGB(b_);
					break;
				case V4L2_PIX_FMT_RGB32:
					*f_even++ = LIMIT_RGB(r_);
					*f_even++ = LIMIT_RGB(g_);
					*f_even++ = LIMIT_RGB(b_);
					f_even++;
					break;
				case V4L2_PIX_FMT_RGB555:
					g = LIMIT_RGB(g_);
					*f_even++ = (0x1F & LIMIT_RGB(r_)) |
						(0xE0 & (g << 5));
					*f_even++ = (0x03 & (g >> 3)) |
						(0x7C & (LIMIT_RGB(b_) << 2));
					break;
				}
			}
			clipmask_even_index += clipmask_add;
			f_even += stretch_bytes;

			scratch_get_extra(usbvision, &y[0], &y_ptr, 2);

			if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
				*f_odd++ = y[0];
				*f_odd++ = v;
			} else {
				y_ = 76284 * (y[0] - 16);

				b_ = (y_ + vb) >> 16;
				g_ = (y_ + uvg) >> 16;
				r_ = (y_ + ur) >> 16;

				switch (frame->v4l2_format.format) {
				case V4L2_PIX_FMT_RGB565:
					g = LIMIT_RGB(g_);
					*f_odd++ =
						(0x1F & LIMIT_RGB(r_)) |
						(0xE0 & (g << 5));
					*f_odd++ =
						(0x07 & (g >> 3)) |
						(0xF8 &  LIMIT_RGB(b_));
					break;
				case V4L2_PIX_FMT_RGB24:
					*f_odd++ = LIMIT_RGB(r_);
					*f_odd++ = LIMIT_RGB(g_);
					*f_odd++ = LIMIT_RGB(b_);
					break;
				case V4L2_PIX_FMT_RGB32:
					*f_odd++ = LIMIT_RGB(r_);
					*f_odd++ = LIMIT_RGB(g_);
					*f_odd++ = LIMIT_RGB(b_);
					f_odd++;
					break;
				case V4L2_PIX_FMT_RGB555:
					g = LIMIT_RGB(g_);
					*f_odd++ = (0x1F & LIMIT_RGB(r_)) |
						(0xE0 & (g << 5));
					*f_odd++ = (0x03 & (g >> 3)) |
						(0x7C & (LIMIT_RGB(b_) << 2));
					break;
				}
			}
			clipmask_odd_index += clipmask_add;
			f_odd += stretch_bytes;

			if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
				*f_odd++ = y[1];
				*f_odd++ = u;
			} else {
				y_ = 76284 * (y[1] - 16);

				b_ = (y_ + vb) >> 16;
				g_ = (y_ + uvg) >> 16;
				r_ = (y_ + ur) >> 16;

				switch (frame->v4l2_format.format) {
				case V4L2_PIX_FMT_RGB565:
					g = LIMIT_RGB(g_);
					*f_odd++ =
						(0x1F & LIMIT_RGB(r_)) |
						(0xE0 & (g << 5));
					*f_odd++ =
						(0x07 & (g >> 3)) |
						(0xF8 &  LIMIT_RGB(b_));
					break;
				case V4L2_PIX_FMT_RGB24:
					*f_odd++ = LIMIT_RGB(r_);
					*f_odd++ = LIMIT_RGB(g_);
					*f_odd++ = LIMIT_RGB(b_);
					break;
				case V4L2_PIX_FMT_RGB32:
					*f_odd++ = LIMIT_RGB(r_);
					*f_odd++ = LIMIT_RGB(g_);
					*f_odd++ = LIMIT_RGB(b_);
					f_odd++;
					break;
				case V4L2_PIX_FMT_RGB555:
					g = LIMIT_RGB(g_);
					*f_odd++ = (0x1F & LIMIT_RGB(r_)) |
						(0xE0 & (g << 5));
					*f_odd++ = (0x03 & (g >> 3)) |
						(0x7C & (LIMIT_RGB(b_) << 2));
					break;
				}
			}
			clipmask_odd_index += clipmask_add;
			f_odd += stretch_bytes;
		}

		scratch_rm_old(usbvision, y_step[block % y_step_size] * sub_block_size);
		scratch_inc_extra_ptr(&y_ptr, y_step[(block + 2 * block_split) % y_step_size]
				* sub_block_size);
		scratch_inc_extra_ptr(&u_ptr, uv_step[block % uv_step_size]
				* sub_block_size);
		scratch_inc_extra_ptr(&v_ptr, uv_step[(block + 2 * block_split) % uv_step_size]
				* sub_block_size);
	}

	scratch_rm_old(usbvision, pixel_per_line * 3 / 2
			+ block_split * sub_block_size);

	frame->curline += 2 * usbvision->stretch_height;
	*pcopylen += frame->v4l2_linesize * 2 * usbvision->stretch_height;

	if (frame->curline >= frame->frmheight)
		return parse_state_next_frame;
	return parse_state_continue;
}

/*
 * usbvision_parse_data()
 *
 * Generic routine to parse the scratch buffer. It employs either
 * usbvision_find_header() or usbvision_parse_lines() to do most
 * of work.
 *
 */
static void usbvision_parse_data(struct usb_usbvision *usbvision)
{
	struct usbvision_frame *frame;
	enum parse_state newstate;
	long copylen = 0;
	unsigned long lock_flags;

	frame = usbvision->cur_frame;

	PDEBUG(DBG_PARSE, "parsing len=%d\n", scratch_len(usbvision));

	while (1) {
		newstate = parse_state_out;
		if (scratch_len(usbvision)) {
			if (frame->scanstate == scan_state_scanning) {
				newstate = usbvision_find_header(usbvision);
			} else if (frame->scanstate == scan_state_lines) {
				if (usbvision->isoc_mode == ISOC_MODE_YUV420)
					newstate = usbvision_parse_lines_420(usbvision, &copylen);
				else if (usbvision->isoc_mode == ISOC_MODE_YUV422)
					newstate = usbvision_parse_lines_422(usbvision, &copylen);
				else if (usbvision->isoc_mode == ISOC_MODE_COMPRESS)
					newstate = usbvision_parse_compress(usbvision, &copylen);
			}
		}
		if (newstate == parse_state_continue)
			continue;
		if ((newstate == parse_state_next_frame) || (newstate == parse_state_out))
			break;
		return;	/* parse_state_end_parse */
	}

	if (newstate == parse_state_next_frame) {
		frame->grabstate = frame_state_done;
		frame->ts = ktime_get_ns();
		frame->sequence = usbvision->frame_num;

		spin_lock_irqsave(&usbvision->queue_lock, lock_flags);
		list_move_tail(&(frame->frame), &usbvision->outqueue);
		usbvision->cur_frame = NULL;
		spin_unlock_irqrestore(&usbvision->queue_lock, lock_flags);

		usbvision->frame_num++;

		/* This will cause the process to request another frame. */
		if (waitqueue_active(&usbvision->wait_frame)) {
			PDEBUG(DBG_PARSE, "Wake up !");
			wake_up_interruptible(&usbvision->wait_frame);
		}
	} else {
		frame->grabstate = frame_state_grabbing;
	}

	/* Update the frame's uncompressed length. */
	frame->scanlength += copylen;
}


/*
 * Make all of the blocks of data contiguous
 */
static int usbvision_compress_isochronous(struct usb_usbvision *usbvision,
					  struct urb *urb)
{
	unsigned char *packet_data;
	int i, totlen = 0;

	for (i = 0; i < urb->number_of_packets; i++) {
		int packet_len = urb->iso_frame_desc[i].actual_length;
		int packet_stat = urb->iso_frame_desc[i].status;

		packet_data = urb->transfer_buffer + urb->iso_frame_desc[i].offset;

		/* Detect and ignore errored packets */
		if (packet_stat) {	/* packet_stat != 0 ????????????? */
			PDEBUG(DBG_ISOC, "data error: [%d] len=%d, status=%X", i, packet_len, packet_stat);
			usbvision->isoc_err_count++;
			continue;
		}

		/* Detect and ignore empty packets */
		if (packet_len < 0) {
			PDEBUG(DBG_ISOC, "error packet [%d]", i);
			usbvision->isoc_skip_count++;
			continue;
		} else if (packet_len == 0) {	/* Frame end ????? */
			PDEBUG(DBG_ISOC, "null packet [%d]", i);
			usbvision->isocstate = isoc_state_no_frame;
			usbvision->isoc_skip_count++;
			continue;
		} else if (packet_len > usbvision->isoc_packet_size) {
			PDEBUG(DBG_ISOC, "packet[%d] > isoc_packet_size", i);
			usbvision->isoc_skip_count++;
			continue;
		}

		PDEBUG(DBG_ISOC, "packet ok [%d] len=%d", i, packet_len);

		if (usbvision->isocstate == isoc_state_no_frame) { /* new frame begins */
			usbvision->isocstate = isoc_state_in_frame;
			scratch_mark_header(usbvision);
			usbvision_measure_bandwidth(usbvision);
			PDEBUG(DBG_ISOC, "packet with header");
		}

		/*
		 * If usbvision continues to feed us with data but there is no
		 * consumption (if, for example, V4L client fell asleep) we
		 * may overflow the buffer. We have to move old data over to
		 * free room for new data. This is bad for old data. If we
		 * just drop new data then it's bad for new data... choose
		 * your favorite evil here.
		 */
		if (scratch_free(usbvision) < packet_len) {
			usbvision->scratch_ovf_count++;
			PDEBUG(DBG_ISOC, "scratch buf overflow! scr_len: %d, n: %d",
			       scratch_len(usbvision), packet_len);
			scratch_rm_old(usbvision, packet_len - scratch_free(usbvision));
		}

		/* Now we know that there is enough room in scratch buffer */
		scratch_put(usbvision, packet_data, packet_len);
		totlen += packet_len;
		usbvision->isoc_data_count += packet_len;
		usbvision->isoc_packet_count++;
	}
#if ENABLE_HEXDUMP
	if (totlen > 0) {
		static int foo;

		if (foo < 1) {
			printk(KERN_DEBUG "+%d.\n", usbvision->scratchlen);
			usbvision_hexdump(data0, (totlen > 64) ? 64 : totlen);
			++foo;
		}
	}
#endif
	return totlen;
}

static void usbvision_isoc_irq(struct urb *urb)
{
	int err_code = 0;
	int len;
	struct usb_usbvision *usbvision = urb->context;
	int i;
	struct usbvision_frame **f;

	/* We don't want to do anything if we are about to be removed! */
	if (!USBVISION_IS_OPERATIONAL(usbvision))
		return;

	/* any urb with wrong status is ignored without acknowledgement */
	if (urb->status == -ENOENT)
		return;

	f = &usbvision->cur_frame;

	/* Manage streaming interruption */
	if (usbvision->streaming == stream_interrupt) {
		usbvision->streaming = stream_idle;
		if ((*f)) {
			(*f)->grabstate = frame_state_ready;
			(*f)->scanstate = scan_state_scanning;
		}
		PDEBUG(DBG_IRQ, "stream interrupted");
		wake_up_interruptible(&usbvision->wait_stream);
	}

	/* Copy the data received into our scratch buffer */
	len = usbvision_compress_isochronous(usbvision, urb);

	usbvision->isoc_urb_count++;
	usbvision->urb_length = len;

	if (usbvision->streaming == stream_on) {
		/* If we collected enough data let's parse! */
		if (scratch_len(usbvision) > USBVISION_HEADER_LENGTH &&
		    !list_empty(&(usbvision->inqueue))) {
			if (!(*f)) {
				(*f) = list_entry(usbvision->inqueue.next,
						  struct usbvision_frame,
						  frame);
			}
			usbvision_parse_data(usbvision);
		} else {
			/* If we don't have a frame
			  we're current working on, complain */
			PDEBUG(DBG_IRQ,
			       "received data, but no one needs it");
			scratch_reset(usbvision);
		}
	} else {
		PDEBUG(DBG_IRQ, "received data, but no one needs it");
		scratch_reset(usbvision);
	}

	for (i = 0; i < USBVISION_URB_FRAMES; i++) {
		urb->iso_frame_desc[i].status = 0;
		urb->iso_frame_desc[i].actual_length = 0;
	}

	urb->status = 0;
	urb->dev = usbvision->dev;
	err_code = usb_submit_urb(urb, GFP_ATOMIC);

	if (err_code) {
		dev_err(&usbvision->dev->dev,
			"%s: usb_submit_urb failed: error %d\n",
				__func__, err_code);
	}

	return;
}

/*************************************/
/* Low level usbvision access functions */
/*************************************/

/*
 * usbvision_read_reg()
 *
 * return  < 0 -> Error
 *        >= 0 -> Data
 */

int usbvision_read_reg(struct usb_usbvision *usbvision, unsigned char reg)
{
	int err_code = 0;
	unsigned char *buffer = usbvision->ctrl_urb_buffer;

	if (!USBVISION_IS_OPERATIONAL(usbvision))
		return -1;

	err_code = usb_control_msg(usbvision->dev, usb_rcvctrlpipe(usbvision->dev, 1),
				USBVISION_OP_CODE,
				USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT,
				0, (__u16) reg, buffer, 1, HZ);

	if (err_code < 0) {
		dev_err(&usbvision->dev->dev,
			"%s: failed: error %d\n", __func__, err_code);
		return err_code;
	}
	return buffer[0];
}

/*
 * usbvision_write_reg()
 *
 * return 1 -> Reg written
 *        0 -> usbvision is not yet ready
 *       -1 -> Something went wrong
 */

int usbvision_write_reg(struct usb_usbvision *usbvision, unsigned char reg,
			    unsigned char value)
{
	int err_code = 0;

	if (!USBVISION_IS_OPERATIONAL(usbvision))
		return 0;

	usbvision->ctrl_urb_buffer[0] = value;
	err_code = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
				USBVISION_OP_CODE,
				USB_DIR_OUT | USB_TYPE_VENDOR |
				USB_RECIP_ENDPOINT, 0, (__u16) reg,
				usbvision->ctrl_urb_buffer, 1, HZ);

	if (err_code < 0) {
		dev_err(&usbvision->dev->dev,
			"%s: failed: error %d\n", __func__, err_code);
	}
	return err_code;
}


static void usbvision_ctrl_urb_complete(struct urb *urb)
{
	struct usb_usbvision *usbvision = (struct usb_usbvision *)urb->context;

	PDEBUG(DBG_IRQ, "");
	usbvision->ctrl_urb_busy = 0;
}


static int usbvision_write_reg_irq(struct usb_usbvision *usbvision, int address,
				unsigned char *data, int len)
{
	int err_code = 0;

	PDEBUG(DBG_IRQ, "");
	if (len > 8)
		return -EFAULT;
	if (usbvision->ctrl_urb_busy)
		return -EBUSY;
	usbvision->ctrl_urb_busy = 1;

	usbvision->ctrl_urb_setup.bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT;
	usbvision->ctrl_urb_setup.bRequest     = USBVISION_OP_CODE;
	usbvision->ctrl_urb_setup.wValue       = 0;
	usbvision->ctrl_urb_setup.wIndex       = cpu_to_le16(address);
	usbvision->ctrl_urb_setup.wLength      = cpu_to_le16(len);
	usb_fill_control_urb(usbvision->ctrl_urb, usbvision->dev,
							usb_sndctrlpipe(usbvision->dev, 1),
							(unsigned char *)&usbvision->ctrl_urb_setup,
							(void *)usbvision->ctrl_urb_buffer, len,
							usbvision_ctrl_urb_complete,
							(void *)usbvision);

	memcpy(usbvision->ctrl_urb_buffer, data, len);

	err_code = usb_submit_urb(usbvision->ctrl_urb, GFP_ATOMIC);
	if (err_code < 0) {
		/* error in usb_submit_urb() */
		usbvision->ctrl_urb_busy = 0;
	}
	PDEBUG(DBG_IRQ, "submit %d byte: error %d", len, err_code);
	return err_code;
}


static int usbvision_init_compression(struct usb_usbvision *usbvision)
{
	usbvision->last_isoc_frame_num = -1;
	usbvision->isoc_data_count = 0;
	usbvision->isoc_packet_count = 0;
	usbvision->isoc_skip_count = 0;
	usbvision->compr_level = 50;
	usbvision->last_compr_level = -1;
	usbvision->isoc_urb_count = 0;
	usbvision->request_intra = 1;
	usbvision->isoc_measure_bandwidth_count = 0;

	return 0;
}

/* this function measures the used bandwidth since last call
 * return:    0 : no error
 * sets used_bandwidth to 1-100 : 1-100% of full bandwidth resp. to isoc_packet_size
 */
static int usbvision_measure_bandwidth(struct usb_usbvision *usbvision)
{
	if (usbvision->isoc_measure_bandwidth_count < 2) { /* this gives an average bandwidth of 3 frames */
		usbvision->isoc_measure_bandwidth_count++;
		return 0;
	}
	if ((usbvision->isoc_packet_size > 0) && (usbvision->isoc_packet_count > 0)) {
		usbvision->used_bandwidth = usbvision->isoc_data_count /
					(usbvision->isoc_packet_count + usbvision->isoc_skip_count) *
					100 / usbvision->isoc_packet_size;
	}
	usbvision->isoc_measure_bandwidth_count = 0;
	usbvision->isoc_data_count = 0;
	usbvision->isoc_packet_count = 0;
	usbvision->isoc_skip_count = 0;
	return 0;
}

static int usbvision_adjust_compression(struct usb_usbvision *usbvision)
{
	int err_code = 0;
	unsigned char buffer[6];

	PDEBUG(DBG_IRQ, "");
	if ((adjust_compression) && (usbvision->used_bandwidth > 0)) {
		usbvision->compr_level += (usbvision->used_bandwidth - 90) / 2;
		RESTRICT_TO_RANGE(usbvision->compr_level, 0, 100);
		if (usbvision->compr_level != usbvision->last_compr_level) {
			int distortion;

			if (usbvision->bridge_type == BRIDGE_NT1004 || usbvision->bridge_type == BRIDGE_NT1005) {
				buffer[0] = (unsigned char)(4 + 16 * usbvision->compr_level / 100);	/* PCM Threshold 1 */
				buffer[1] = (unsigned char)(4 + 8 * usbvision->compr_level / 100);	/* PCM Threshold 2 */
				distortion = 7 + 248 * usbvision->compr_level / 100;
				buffer[2] = (unsigned char)(distortion & 0xFF);				/* Average distortion Threshold (inter) */
				buffer[3] = (unsigned char)(distortion & 0xFF);				/* Average distortion Threshold (intra) */
				distortion = 1 + 42 * usbvision->compr_level / 100;
				buffer[4] = (unsigned char)(distortion & 0xFF);				/* Maximum distortion Threshold (inter) */
				buffer[5] = (unsigned char)(distortion & 0xFF);				/* Maximum distortion Threshold (intra) */
			} else { /* BRIDGE_NT1003 */
				buffer[0] = (unsigned char)(4 + 16 * usbvision->compr_level / 100);	/* PCM threshold 1 */
				buffer[1] = (unsigned char)(4 + 8 * usbvision->compr_level / 100);	/* PCM threshold 2 */
				distortion = 2 + 253 * usbvision->compr_level / 100;
				buffer[2] = (unsigned char)(distortion & 0xFF);				/* distortion threshold bit0-7 */
				buffer[3] = 0;	/* (unsigned char)((distortion >> 8) & 0x0F);		distortion threshold bit 8-11 */
				distortion = 0 + 43 * usbvision->compr_level / 100;
				buffer[4] = (unsigned char)(distortion & 0xFF);				/* maximum distortion bit0-7 */
				buffer[5] = 0; /* (unsigned char)((distortion >> 8) & 0x01);		maximum distortion bit 8 */
			}
			err_code = usbvision_write_reg_irq(usbvision, USBVISION_PCM_THR1, buffer, 6);
			if (err_code == 0) {
				PDEBUG(DBG_IRQ, "new compr params %#02x %#02x %#02x %#02x %#02x %#02x", buffer[0],
								buffer[1], buffer[2], buffer[3], buffer[4], buffer[5]);
				usbvision->last_compr_level = usbvision->compr_level;
			}
		}
	}
	return err_code;
}

static int usbvision_request_intra(struct usb_usbvision *usbvision)
{
	unsigned char buffer[1];

	PDEBUG(DBG_IRQ, "");
	usbvision->request_intra = 1;
	buffer[0] = 1;
	usbvision_write_reg_irq(usbvision, USBVISION_FORCE_INTRA, buffer, 1);
	return 0;
}

static int usbvision_unrequest_intra(struct usb_usbvision *usbvision)
{
	unsigned char buffer[1];

	PDEBUG(DBG_IRQ, "");
	usbvision->request_intra = 0;
	buffer[0] = 0;
	usbvision_write_reg_irq(usbvision, USBVISION_FORCE_INTRA, buffer, 1);
	return 0;
}

/*******************************
 * usbvision utility functions
 *******************************/

int usbvision_power_off(struct usb_usbvision *usbvision)
{
	int err_code = 0;

	PDEBUG(DBG_FUNC, "");

	err_code = usbvision_write_reg(usbvision, USBVISION_PWR_REG, USBVISION_SSPND_EN);
	if (err_code == 1)
		usbvision->power = 0;
	PDEBUG(DBG_FUNC, "%s: err_code %d", (err_code != 1) ? "ERROR" : "power is off", err_code);
	return err_code;
}

/* configure webcam image sensor using the serial port */
static int usbvision_init_webcam(struct usb_usbvision *usbvision)
{
	int rc;
	int i;
	static char init_values[38][3] = {
		{ 0x04, 0x12, 0x08 }, { 0x05, 0xff, 0xc8 }, { 0x06, 0x18, 0x07 }, { 0x07, 0x90, 0x00 },
		{ 0x09, 0x00, 0x00 }, { 0x0a, 0x00, 0x00 }, { 0x0b, 0x08, 0x00 }, { 0x0d, 0xcc, 0xcc },
		{ 0x0e, 0x13, 0x14 }, { 0x10, 0x9b, 0x83 }, { 0x11, 0x5a, 0x3f }, { 0x12, 0xe4, 0x73 },
		{ 0x13, 0x88, 0x84 }, { 0x14, 0x89, 0x80 }, { 0x15, 0x00, 0x20 }, { 0x16, 0x00, 0x00 },
		{ 0x17, 0xff, 0xa0 }, { 0x18, 0x6b, 0x20 }, { 0x19, 0x22, 0x40 }, { 0x1a, 0x10, 0x07 },
		{ 0x1b, 0x00, 0x47 }, { 0x1c, 0x03, 0xe0 }, { 0x1d, 0x00, 0x00 }, { 0x1e, 0x00, 0x00 },
		{ 0x1f, 0x00, 0x00 }, { 0x20, 0x00, 0x00 }, { 0x21, 0x00, 0x00 }, { 0x22, 0x00, 0x00 },
		{ 0x23, 0x00, 0x00 }, { 0x24, 0x00, 0x00 }, { 0x25, 0x00, 0x00 }, { 0x26, 0x00, 0x00 },
		{ 0x27, 0x00, 0x00 }, { 0x28, 0x00, 0x00 }, { 0x29, 0x00, 0x00 }, { 0x08, 0x80, 0x60 },
		{ 0x0f, 0x2d, 0x24 }, { 0x0c, 0x80, 0x80 }
	};
	unsigned char *value = usbvision->ctrl_urb_buffer;

	/* the only difference between PAL and NTSC init_values */
	if (usbvision_device_data[usbvision->dev_model].video_norm == V4L2_STD_NTSC)
		init_values[4][1] = 0x34;

	for (i = 0; i < sizeof(init_values) / 3; i++) {
		usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_SER_MODE_SOFT);
		memcpy(value, init_values[i], 3);
		rc = usb_control_msg(usbvision->dev,
				     usb_sndctrlpipe(usbvision->dev, 1),
				     USBVISION_OP_CODE,
				     USB_DIR_OUT | USB_TYPE_VENDOR |
				     USB_RECIP_ENDPOINT, 0,
				     (__u16) USBVISION_SER_DAT1, value,
				     3, HZ);
		if (rc < 0)
			return rc;
		usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_SER_MODE_SIO);
		/* write 3 bytes to the serial port using SIO mode */
		usbvision_write_reg(usbvision, USBVISION_SER_CONT, 3 | 0x10);
		usbvision_write_reg(usbvision, USBVISION_IOPIN_REG, 0);
		usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_SER_MODE_SOFT);
		usbvision_write_reg(usbvision, USBVISION_IOPIN_REG, USBVISION_IO_2);
		usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_SER_MODE_SOFT | USBVISION_CLK_OUT);
		usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_SER_MODE_SOFT | USBVISION_DAT_IO);
		usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_SER_MODE_SOFT | USBVISION_CLK_OUT | USBVISION_DAT_IO);
	}

	return 0;
}

/*
 * usbvision_set_video_format()
 *
 */
static int usbvision_set_video_format(struct usb_usbvision *usbvision, int format)
{
	static const char proc[] = "usbvision_set_video_format";
	unsigned char *value = usbvision->ctrl_urb_buffer;
	int rc;

	if (!USBVISION_IS_OPERATIONAL(usbvision))
		return 0;

	PDEBUG(DBG_FUNC, "isoc_mode %#02x", format);

	if ((format != ISOC_MODE_YUV422)
	    && (format != ISOC_MODE_YUV420)
	    && (format != ISOC_MODE_COMPRESS)) {
		printk(KERN_ERR "usbvision: unknown video format %02x, using default YUV420",
		       format);
		format = ISOC_MODE_YUV420;
	}
	value[0] = 0x0A;  /* TODO: See the effect of the filter */
	value[1] = format; /* Sets the VO_MODE register which follows FILT_CONT */
	rc = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
			     USBVISION_OP_CODE,
			     USB_DIR_OUT | USB_TYPE_VENDOR |
			     USB_RECIP_ENDPOINT, 0,
			     (__u16) USBVISION_FILT_CONT, value, 2, HZ);

	if (rc < 0) {
		printk(KERN_ERR "%s: ERROR=%d. USBVISION stopped - reconnect or reload driver.\n",
		       proc, rc);
	}
	usbvision->isoc_mode = format;
	return rc;
}

/*
 * usbvision_set_output()
 *
 */

int usbvision_set_output(struct usb_usbvision *usbvision, int width,
			 int height)
{
	int err_code = 0;
	int usb_width, usb_height;
	unsigned int frame_rate = 0, frame_drop = 0;
	unsigned char *value = usbvision->ctrl_urb_buffer;

	if (!USBVISION_IS_OPERATIONAL(usbvision))
		return 0;

	if (width > MAX_USB_WIDTH) {
		usb_width = width / 2;
		usbvision->stretch_width = 2;
	} else {
		usb_width = width;
		usbvision->stretch_width = 1;
	}

	if (height > MAX_USB_HEIGHT) {
		usb_height = height / 2;
		usbvision->stretch_height = 2;
	} else {
		usb_height = height;
		usbvision->stretch_height = 1;
	}

	RESTRICT_TO_RANGE(usb_width, MIN_FRAME_WIDTH, MAX_USB_WIDTH);
	usb_width &= ~(MIN_FRAME_WIDTH-1);
	RESTRICT_TO_RANGE(usb_height, MIN_FRAME_HEIGHT, MAX_USB_HEIGHT);
	usb_height &= ~(1);

	PDEBUG(DBG_FUNC, "usb %dx%d; screen %dx%d; stretch %dx%d",
						usb_width, usb_height, width, height,
						usbvision->stretch_width, usbvision->stretch_height);

	/* I'll not rewrite the same values */
	if ((usb_width != usbvision->curwidth) || (usb_height != usbvision->curheight)) {
		value[0] = usb_width & 0xff;		/* LSB */
		value[1] = (usb_width >> 8) & 0x03;	/* MSB */
		value[2] = usb_height & 0xff;		/* LSB */
		value[3] = (usb_height >> 8) & 0x03;	/* MSB */

		err_code = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
			     USBVISION_OP_CODE,
			     USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT,
				 0, (__u16) USBVISION_LXSIZE_O, value, 4, HZ);

		if (err_code < 0) {
			dev_err(&usbvision->dev->dev,
				"%s failed: error %d\n", __func__, err_code);
			return err_code;
		}
		usbvision->curwidth = usbvision->stretch_width * usb_width;
		usbvision->curheight = usbvision->stretch_height * usb_height;
	}

	if (usbvision->isoc_mode == ISOC_MODE_YUV422)
		frame_rate = (usbvision->isoc_packet_size * 1000) / (usb_width * usb_height * 2);
	else if (usbvision->isoc_mode == ISOC_MODE_YUV420)
		frame_rate = (usbvision->isoc_packet_size * 1000) / ((usb_width * usb_height * 12) / 8);
	else
		frame_rate = FRAMERATE_MAX;

	if (usbvision->tvnorm_id & V4L2_STD_625_50)
		frame_drop = frame_rate * 32 / 25 - 1;
	else if (usbvision->tvnorm_id & V4L2_STD_525_60)
		frame_drop = frame_rate * 32 / 30 - 1;

	RESTRICT_TO_RANGE(frame_drop, FRAMERATE_MIN, FRAMERATE_MAX);

	PDEBUG(DBG_FUNC, "frame_rate %d fps, frame_drop %d", frame_rate, frame_drop);

	frame_drop = FRAMERATE_MAX;	/* We can allow the maximum here, because dropping is controlled */

	if (usbvision_device_data[usbvision->dev_model].codec == CODEC_WEBCAM) {
		if (usbvision_device_data[usbvision->dev_model].video_norm == V4L2_STD_PAL)
			frame_drop = 25;
		else
			frame_drop = 30;
	}

	/* frame_drop = 7; => frame_phase = 1, 5, 9, 13, 17, 21, 25, 0, 4, 8, ...
		=> frame_skip = 4;
		=> frame_rate = (7 + 1) * 25 / 32 = 200 / 32 = 6.25;

	   frame_drop = 9; => frame_phase = 1, 5, 8, 11, 14, 17, 21, 24, 27, 1, 4, 8, ...
	    => frame_skip = 4, 3, 3, 3, 3, 4, 3, 3, 3, 3, 4, ...
		=> frame_rate = (9 + 1) * 25 / 32 = 250 / 32 = 7.8125;
	*/
	err_code = usbvision_write_reg(usbvision, USBVISION_FRM_RATE, frame_drop);
	return err_code;
}


/*
 * usbvision_frames_alloc
 * allocate the required frames
 */
int usbvision_frames_alloc(struct usb_usbvision *usbvision, int number_of_frames)
{
	int i;

	/* needs to be page aligned cause the buffers can be mapped individually! */
	usbvision->max_frame_size = PAGE_ALIGN(usbvision->curwidth *
						usbvision->curheight *
						usbvision->palette.bytes_per_pixel);

	/* Try to do my best to allocate the frames the user want in the remaining memory */
	usbvision->num_frames = number_of_frames;
	while (usbvision->num_frames > 0) {
		usbvision->fbuf_size = usbvision->num_frames * usbvision->max_frame_size;
		usbvision->fbuf = usbvision_rvmalloc(usbvision->fbuf_size);
		if (usbvision->fbuf)
			break;
		usbvision->num_frames--;
	}

	/* Allocate all buffers */
	for (i = 0; i < usbvision->num_frames; i++) {
		usbvision->frame[i].index = i;
		usbvision->frame[i].grabstate = frame_state_unused;
		usbvision->frame[i].data = usbvision->fbuf +
			i * usbvision->max_frame_size;
		/*
		 * Set default sizes for read operation.
		 */
		usbvision->stretch_width = 1;
		usbvision->stretch_height = 1;
		usbvision->frame[i].width = usbvision->curwidth;
		usbvision->frame[i].height = usbvision->curheight;
		usbvision->frame[i].bytes_read = 0;
	}
	PDEBUG(DBG_FUNC, "allocated %d frames (%d bytes per frame)",
			usbvision->num_frames, usbvision->max_frame_size);
	return usbvision->num_frames;
}

/*
 * usbvision_frames_free
 * frees memory allocated for the frames
 */
void usbvision_frames_free(struct usb_usbvision *usbvision)
{
	/* Have to free all that memory */
	PDEBUG(DBG_FUNC, "free %d frames", usbvision->num_frames);

	if (usbvision->fbuf != NULL) {
		usbvision_rvfree(usbvision->fbuf, usbvision->fbuf_size);
		usbvision->fbuf = NULL;

		usbvision->num_frames = 0;
	}
}
/*
 * usbvision_empty_framequeues()
 * prepare queues for incoming and outgoing frames
 */
void usbvision_empty_framequeues(struct usb_usbvision *usbvision)
{
	u32 i;

	INIT_LIST_HEAD(&(usbvision->inqueue));
	INIT_LIST_HEAD(&(usbvision->outqueue));

	for (i = 0; i < USBVISION_NUMFRAMES; i++) {
		usbvision->frame[i].grabstate = frame_state_unused;
		usbvision->frame[i].bytes_read = 0;
	}
}

/*
 * usbvision_stream_interrupt()
 * stops streaming
 */
int usbvision_stream_interrupt(struct usb_usbvision *usbvision)
{
	int ret = 0;

	/* stop reading from the device */

	usbvision->streaming = stream_interrupt;
	ret = wait_event_timeout(usbvision->wait_stream,
				 (usbvision->streaming == stream_idle),
				 msecs_to_jiffies(USBVISION_NUMSBUF*USBVISION_URB_FRAMES));
	return ret;
}

/*
 * usbvision_set_compress_params()
 *
 */

static int usbvision_set_compress_params(struct usb_usbvision *usbvision)
{
	static const char proc[] = "usbvision_set_compression_params: ";
	int rc;
	unsigned char *value = usbvision->ctrl_urb_buffer;

	value[0] = 0x0F;    /* Intra-Compression cycle */
	value[1] = 0x01;    /* Reg.45 one line per strip */
	value[2] = 0x00;    /* Reg.46 Force intra mode on all new frames */
	value[3] = 0x00;    /* Reg.47 FORCE_UP <- 0 normal operation (not force) */
	value[4] = 0xA2;    /* Reg.48 BUF_THR I'm not sure if this does something in not compressed mode. */
	value[5] = 0x00;    /* Reg.49 DVI_YUV This has nothing to do with compression */

	/* caught values for NT1004 */
	/* value[0] = 0xFF; Never apply intra mode automatically */
	/* value[1] = 0xF1; Use full frame height for virtual strip width; One line per strip */
	/* value[2] = 0x01; Force intra mode on all new frames */
	/* value[3] = 0x00; Strip size 400 Bytes; do not force up */
	/* value[4] = 0xA2; */
	if (!USBVISION_IS_OPERATIONAL(usbvision))
		return 0;

	rc = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
			     USBVISION_OP_CODE,
			     USB_DIR_OUT | USB_TYPE_VENDOR |
			     USB_RECIP_ENDPOINT, 0,
			     (__u16) USBVISION_INTRA_CYC, value, 5, HZ);

	if (rc < 0) {
		printk(KERN_ERR "%sERROR=%d. USBVISION stopped - reconnect or reload driver.\n",
		       proc, rc);
		return rc;
	}

	if (usbvision->bridge_type == BRIDGE_NT1004) {
		value[0] =  20; /* PCM Threshold 1 */
		value[1] =  12; /* PCM Threshold 2 */
		value[2] = 255; /* Distortion Threshold inter */
		value[3] = 255; /* Distortion Threshold intra */
		value[4] =  43; /* Max Distortion inter */
		value[5] =  43; /* Max Distortion intra */
	} else {
		value[0] =  20; /* PCM Threshold 1 */
		value[1] =  12; /* PCM Threshold 2 */
		value[2] = 255; /* Distortion Threshold d7-d0 */
		value[3] =   0; /* Distortion Threshold d11-d8 */
		value[4] =  43; /* Max Distortion d7-d0 */
		value[5] =   0; /* Max Distortion d8 */
	}

	if (!USBVISION_IS_OPERATIONAL(usbvision))
		return 0;

	rc = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
			     USBVISION_OP_CODE,
			     USB_DIR_OUT | USB_TYPE_VENDOR |
			     USB_RECIP_ENDPOINT, 0,
			     (__u16) USBVISION_PCM_THR1, value, 6, HZ);

	if (rc < 0) {
		printk(KERN_ERR "%sERROR=%d. USBVISION stopped - reconnect or reload driver.\n",
		       proc, rc);
	}
	return rc;
}


/*
 * usbvision_set_input()
 *
 * Set the input (saa711x, ...) size x y and other misc input params
 * I've no idea if this parameters are right
 *
 */
int usbvision_set_input(struct usb_usbvision *usbvision)
{
	static const char proc[] = "usbvision_set_input: ";
	int rc;
	unsigned char *value = usbvision->ctrl_urb_buffer;
	unsigned char dvi_yuv_value;

	if (!USBVISION_IS_OPERATIONAL(usbvision))
		return 0;

	/* Set input format expected from decoder*/
	if (usbvision_device_data[usbvision->dev_model].vin_reg1_override) {
		value[0] = usbvision_device_data[usbvision->dev_model].vin_reg1;
	} else if (usbvision_device_data[usbvision->dev_model].codec == CODEC_SAA7113) {
		/* SAA7113 uses 8 bit output */
		value[0] = USBVISION_8_422_SYNC;
	} else {
		/* I'm sure only about d2-d0 [010] 16 bit 4:2:2 using sync pulses
		 * as that is how saa7111 is configured */
		value[0] = USBVISION_16_422_SYNC;
		/* | USBVISION_VSNC_POL | USBVISION_VCLK_POL);*/
	}

	rc = usbvision_write_reg(usbvision, USBVISION_VIN_REG1, value[0]);
	if (rc < 0) {
		printk(KERN_ERR "%sERROR=%d. USBVISION stopped - reconnect or reload driver.\n",
		       proc, rc);
		return rc;
	}


	if (usbvision->tvnorm_id & V4L2_STD_PAL) {
		value[0] = 0xC0;
		value[1] = 0x02;	/* 0x02C0 -> 704 Input video line length */
		value[2] = 0x20;
		value[3] = 0x01;	/* 0x0120 -> 288 Input video n. of lines */
		value[4] = 0x60;
		value[5] = 0x00;	/* 0x0060 -> 96 Input video h offset */
		value[6] = 0x16;
		value[7] = 0x00;	/* 0x0016 -> 22 Input video v offset */
	} else if (usbvision->tvnorm_id & V4L2_STD_SECAM) {
		value[0] = 0xC0;
		value[1] = 0x02;	/* 0x02C0 -> 704 Input video line length */
		value[2] = 0x20;
		value[3] = 0x01;	/* 0x0120 -> 288 Input video n. of lines */
		value[4] = 0x01;
		value[5] = 0x00;	/* 0x0001 -> 01 Input video h offset */
		value[6] = 0x01;
		value[7] = 0x00;	/* 0x0001 -> 01 Input video v offset */
	} else {	/* V4L2_STD_NTSC */
		value[0] = 0xD0;
		value[1] = 0x02;	/* 0x02D0 -> 720 Input video line length */
		value[2] = 0xF0;
		value[3] = 0x00;	/* 0x00F0 -> 240 Input video number of lines */
		value[4] = 0x50;
		value[5] = 0x00;	/* 0x0050 -> 80 Input video h offset */
		value[6] = 0x10;
		value[7] = 0x00;	/* 0x0010 -> 16 Input video v offset */
	}

	/* webcam is only 480 pixels wide, both PAL and NTSC version */
	if (usbvision_device_data[usbvision->dev_model].codec == CODEC_WEBCAM) {
		value[0] = 0xe0;
		value[1] = 0x01;	/* 0x01E0 -> 480 Input video line length */
	}

	if (usbvision_device_data[usbvision->dev_model].x_offset >= 0) {
		value[4] = usbvision_device_data[usbvision->dev_model].x_offset & 0xff;
		value[5] = (usbvision_device_data[usbvision->dev_model].x_offset & 0x0300) >> 8;
	}

	if (adjust_x_offset != -1) {
		value[4] = adjust_x_offset & 0xff;
		value[5] = (adjust_x_offset & 0x0300) >> 8;
	}

	if (usbvision_device_data[usbvision->dev_model].y_offset >= 0) {
		value[6] = usbvision_device_data[usbvision->dev_model].y_offset & 0xff;
		value[7] = (usbvision_device_data[usbvision->dev_model].y_offset & 0x0300) >> 8;
	}

	if (adjust_y_offset != -1) {
		value[6] = adjust_y_offset & 0xff;
		value[7] = (adjust_y_offset & 0x0300) >> 8;
	}

	rc = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
			     USBVISION_OP_CODE,	/* USBVISION specific code */
			     USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT, 0,
			     (__u16) USBVISION_LXSIZE_I, value, 8, HZ);
	if (rc < 0) {
		printk(KERN_ERR "%sERROR=%d. USBVISION stopped - reconnect or reload driver.\n",
		       proc, rc);
		return rc;
	}


	dvi_yuv_value = 0x00;	/* U comes after V, Ya comes after U/V, Yb comes after Yb */

	if (usbvision_device_data[usbvision->dev_model].dvi_yuv_override) {
		dvi_yuv_value = usbvision_device_data[usbvision->dev_model].dvi_yuv;
	} else if (usbvision_device_data[usbvision->dev_model].codec == CODEC_SAA7113) {
		/* This changes as the fine sync control changes. Further investigation necessary */
		dvi_yuv_value = 0x06;
	}

	return usbvision_write_reg(usbvision, USBVISION_DVI_YUV, dvi_yuv_value);
}


/*
 * usbvision_set_dram_settings()
 *
 * Set the buffer address needed by the usbvision dram to operate
 * This values has been taken with usbsnoop.
 *
 */

static int usbvision_set_dram_settings(struct usb_usbvision *usbvision)
{
	unsigned char *value = usbvision->ctrl_urb_buffer;
	int rc;

	if (usbvision->isoc_mode == ISOC_MODE_COMPRESS) {
		value[0] = 0x42;
		value[1] = 0x71;
		value[2] = 0xff;
		value[3] = 0x00;
		value[4] = 0x98;
		value[5] = 0xe0;
		value[6] = 0x71;
		value[7] = 0xff;
		/* UR:  0x0E200-0x3FFFF = 204288 Words (1 Word = 2 Byte) */
		/* FDL: 0x00000-0x0E099 =  57498 Words */
		/* VDW: 0x0E3FF-0x3FFFF */
	} else {
		value[0] = 0x42;
		value[1] = 0x00;
		value[2] = 0xff;
		value[3] = 0x00;
		value[4] = 0x00;
		value[5] = 0x00;
		value[6] = 0x00;
		value[7] = 0xff;
	}
	/* These are the values of the address of the video buffer,
	 * they have to be loaded into the USBVISION_DRM_PRM1-8
	 *
	 * Start address of video output buffer for read:	drm_prm1-2 -> 0x00000
	 * End address of video output buffer for read:		drm_prm1-3 -> 0x1ffff
	 * Start address of video frame delay buffer:		drm_prm1-4 -> 0x20000
	 *    Only used in compressed mode
	 * End address of video frame delay buffer:		drm_prm1-5-6 -> 0x3ffff
	 *    Only used in compressed mode
	 * Start address of video output buffer for write:	drm_prm1-7 -> 0x00000
	 * End address of video output buffer for write:	drm_prm1-8 -> 0x1ffff
	 */

	if (!USBVISION_IS_OPERATIONAL(usbvision))
		return 0;

	rc = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
			     USBVISION_OP_CODE,	/* USBVISION specific code */
			     USB_DIR_OUT | USB_TYPE_VENDOR |
			     USB_RECIP_ENDPOINT, 0,
			     (__u16) USBVISION_DRM_PRM1, value, 8, HZ);

	if (rc < 0) {
		dev_err(&usbvision->dev->dev, "%s: ERROR=%d\n", __func__, rc);
		return rc;
	}

	/* Restart the video buffer logic */
	rc = usbvision_write_reg(usbvision, USBVISION_DRM_CONT, USBVISION_RES_UR |
				   USBVISION_RES_FDL | USBVISION_RES_VDW);
	if (rc < 0)
		return rc;
	rc = usbvision_write_reg(usbvision, USBVISION_DRM_CONT, 0x00);

	return rc;
}

/*
 * ()
 *
 * Power on the device, enables suspend-resume logic
 * &  reset the isoc End-Point
 *
 */

int usbvision_power_on(struct usb_usbvision *usbvision)
{
	int err_code = 0;

	PDEBUG(DBG_FUNC, "");

	usbvision_write_reg(usbvision, USBVISION_PWR_REG, USBVISION_SSPND_EN);
	usbvision_write_reg(usbvision, USBVISION_PWR_REG,
			USBVISION_SSPND_EN | USBVISION_RES2);

	if (usbvision_device_data[usbvision->dev_model].codec == CODEC_WEBCAM) {
		usbvision_write_reg(usbvision, USBVISION_VIN_REG1,
				USBVISION_16_422_SYNC | USBVISION_HVALID_PO);
		usbvision_write_reg(usbvision, USBVISION_VIN_REG2,
				USBVISION_NOHVALID | USBVISION_KEEP_BLANK);
	}
	usbvision_write_reg(usbvision, USBVISION_PWR_REG,
			USBVISION_SSPND_EN | USBVISION_PWR_VID);
	mdelay(10);
	err_code = usbvision_write_reg(usbvision, USBVISION_PWR_REG,
			USBVISION_SSPND_EN | USBVISION_PWR_VID | USBVISION_RES2);
	if (err_code == 1)
		usbvision->power = 1;
	PDEBUG(DBG_FUNC, "%s: err_code %d", (err_code < 0) ? "ERROR" : "power is on", err_code);
	return err_code;
}


/*
 * usbvision_begin_streaming()
 * Sure you have to put bit 7 to 0, if not incoming frames are dropped, but no
 * idea about the rest
 */
int usbvision_begin_streaming(struct usb_usbvision *usbvision)
{
	if (usbvision->isoc_mode == ISOC_MODE_COMPRESS)
		usbvision_init_compression(usbvision);
	return usbvision_write_reg(usbvision, USBVISION_VIN_REG2,
		USBVISION_NOHVALID | usbvision->vin_reg2_preset);
}

/*
 * usbvision_restart_isoc()
 * Not sure yet if touching here PWR_REG make loose the config
 */

int usbvision_restart_isoc(struct usb_usbvision *usbvision)
{
	int ret;

	ret = usbvision_write_reg(usbvision, USBVISION_PWR_REG,
			      USBVISION_SSPND_EN | USBVISION_PWR_VID);
	if (ret < 0)
		return ret;
	ret = usbvision_write_reg(usbvision, USBVISION_PWR_REG,
			      USBVISION_SSPND_EN | USBVISION_PWR_VID |
			      USBVISION_RES2);
	if (ret < 0)
		return ret;
	ret = usbvision_write_reg(usbvision, USBVISION_VIN_REG2,
			      USBVISION_KEEP_BLANK | USBVISION_NOHVALID |
				  usbvision->vin_reg2_preset);
	if (ret < 0)
		return ret;

	/* TODO: schedule timeout */
	while ((usbvision_read_reg(usbvision, USBVISION_STATUS_REG) & 0x01) != 1)
		;

	return 0;
}

int usbvision_audio_off(struct usb_usbvision *usbvision)
{
	if (usbvision_write_reg(usbvision, USBVISION_IOPIN_REG, USBVISION_AUDIO_MUTE) < 0) {
		printk(KERN_ERR "usbvision_audio_off: can't write reg\n");
		return -1;
	}
	usbvision->audio_mute = 0;
	usbvision->audio_channel = USBVISION_AUDIO_MUTE;
	return 0;
}

int usbvision_set_audio(struct usb_usbvision *usbvision, int audio_channel)
{
	if (!usbvision->audio_mute) {
		if (usbvision_write_reg(usbvision, USBVISION_IOPIN_REG, audio_channel) < 0) {
			printk(KERN_ERR "usbvision_set_audio: can't write iopin register for audio switching\n");
			return -1;
		}
	}
	usbvision->audio_channel = audio_channel;
	return 0;
}

int usbvision_setup(struct usb_usbvision *usbvision, int format)
{
	if (usbvision_device_data[usbvision->dev_model].codec == CODEC_WEBCAM)
		usbvision_init_webcam(usbvision);
	usbvision_set_video_format(usbvision, format);
	usbvision_set_dram_settings(usbvision);
	usbvision_set_compress_params(usbvision);
	usbvision_set_input(usbvision);
	usbvision_set_output(usbvision, MAX_USB_WIDTH, MAX_USB_HEIGHT);
	usbvision_restart_isoc(usbvision);

	/* cosas del PCM */
	return USBVISION_IS_OPERATIONAL(usbvision);
}

int usbvision_set_alternate(struct usb_usbvision *dev)
{
	int err_code, prev_alt = dev->iface_alt;
	int i;

	dev->iface_alt = 0;
	for (i = 0; i < dev->num_alt; i++)
		if (dev->alt_max_pkt_size[i] > dev->alt_max_pkt_size[dev->iface_alt])
			dev->iface_alt = i;

	if (dev->iface_alt != prev_alt) {
		dev->isoc_packet_size = dev->alt_max_pkt_size[dev->iface_alt];
		PDEBUG(DBG_FUNC, "setting alternate %d with max_packet_size=%u",
				dev->iface_alt, dev->isoc_packet_size);
		err_code = usb_set_interface(dev->dev, dev->iface, dev->iface_alt);
		if (err_code < 0) {
			dev_err(&dev->dev->dev,
				"cannot change alternate number to %d (error=%i)\n",
					dev->iface_alt, err_code);
			return err_code;
		}
	}

	PDEBUG(DBG_ISOC, "ISO Packet Length:%d", dev->isoc_packet_size);

	return 0;
}

/*
 * usbvision_init_isoc()
 *
 */
int usbvision_init_isoc(struct usb_usbvision *usbvision)
{
	struct usb_device *dev = usbvision->dev;
	int buf_idx, err_code, reg_value;
	int sb_size;

	if (!USBVISION_IS_OPERATIONAL(usbvision))
		return -EFAULT;

	usbvision->cur_frame = NULL;
	scratch_reset(usbvision);

	/* Alternate interface 1 is is the biggest frame size */
	err_code = usbvision_set_alternate(usbvision);
	if (err_code < 0) {
		usbvision->last_error = err_code;
		return -EBUSY;
	}
	sb_size = USBVISION_URB_FRAMES * usbvision->isoc_packet_size;

	reg_value = (16 - usbvision_read_reg(usbvision,
					    USBVISION_ALTER_REG)) & 0x0F;

	usbvision->usb_bandwidth = reg_value >> 1;
	PDEBUG(DBG_ISOC, "USB Bandwidth Usage: %dMbit/Sec",
	       usbvision->usb_bandwidth);



	/* We double buffer the Iso lists */

	for (buf_idx = 0; buf_idx < USBVISION_NUMSBUF; buf_idx++) {
		int j, k;
		struct urb *urb;

		urb = usb_alloc_urb(USBVISION_URB_FRAMES, GFP_KERNEL);
		if (urb == NULL)
			return -ENOMEM;
		usbvision->sbuf[buf_idx].urb = urb;
		usbvision->sbuf[buf_idx].data =
			usb_alloc_coherent(usbvision->dev,
					   sb_size,
					   GFP_KERNEL,
					   &urb->transfer_dma);
		if (!usbvision->sbuf[buf_idx].data)
			return -ENOMEM;

		urb->dev = dev;
		urb->context = usbvision;
		urb->pipe = usb_rcvisocpipe(dev, usbvision->video_endp);
		urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
		urb->interval = 1;
		urb->transfer_buffer = usbvision->sbuf[buf_idx].data;
		urb->complete = usbvision_isoc_irq;
		urb->number_of_packets = USBVISION_URB_FRAMES;
		urb->transfer_buffer_length =
		    usbvision->isoc_packet_size * USBVISION_URB_FRAMES;
		for (j = k = 0; j < USBVISION_URB_FRAMES; j++,
		     k += usbvision->isoc_packet_size) {
			urb->iso_frame_desc[j].offset = k;
			urb->iso_frame_desc[j].length =
				usbvision->isoc_packet_size;
		}
	}

	/* Submit all URBs */
	for (buf_idx = 0; buf_idx < USBVISION_NUMSBUF; buf_idx++) {
		err_code = usb_submit_urb(usbvision->sbuf[buf_idx].urb,
					 GFP_KERNEL);
		if (err_code) {
			dev_err(&usbvision->dev->dev,
				"%s: usb_submit_urb(%d) failed: error %d\n",
					__func__, buf_idx, err_code);
		}
	}

	usbvision->streaming = stream_idle;
	PDEBUG(DBG_ISOC, "%s: streaming=1 usbvision->video_endp=$%02x",
	       __func__,
	       usbvision->video_endp);
	return 0;
}

/*
 * usbvision_stop_isoc()
 *
 * This procedure stops streaming and deallocates URBs. Then it
 * activates zero-bandwidth alt. setting of the video interface.
 *
 */
void usbvision_stop_isoc(struct usb_usbvision *usbvision)
{
	int buf_idx, err_code, reg_value;
	int sb_size = USBVISION_URB_FRAMES * usbvision->isoc_packet_size;

	if ((usbvision->streaming == stream_off) || (usbvision->dev == NULL))
		return;

	/* Unschedule all of the iso td's */
	for (buf_idx = 0; buf_idx < USBVISION_NUMSBUF; buf_idx++) {
		usb_kill_urb(usbvision->sbuf[buf_idx].urb);
		if (usbvision->sbuf[buf_idx].data) {
			usb_free_coherent(usbvision->dev,
					  sb_size,
					  usbvision->sbuf[buf_idx].data,
					  usbvision->sbuf[buf_idx].urb->transfer_dma);
		}
		usb_free_urb(usbvision->sbuf[buf_idx].urb);
		usbvision->sbuf[buf_idx].urb = NULL;
	}

	PDEBUG(DBG_ISOC, "%s: streaming=stream_off\n", __func__);
	usbvision->streaming = stream_off;

	if (!usbvision->remove_pending) {
		/* Set packet size to 0 */
		usbvision->iface_alt = 0;
		err_code = usb_set_interface(usbvision->dev, usbvision->iface,
					    usbvision->iface_alt);
		if (err_code < 0) {
			dev_err(&usbvision->dev->dev,
				"%s: usb_set_interface() failed: error %d\n",
					__func__, err_code);
			usbvision->last_error = err_code;
		}
		reg_value = (16-usbvision_read_reg(usbvision, USBVISION_ALTER_REG)) & 0x0F;
		usbvision->isoc_packet_size =
			(reg_value == 0) ? 0 : (reg_value * 64) - 1;
		PDEBUG(DBG_ISOC, "ISO Packet Length:%d",
		       usbvision->isoc_packet_size);

		usbvision->usb_bandwidth = reg_value >> 1;
		PDEBUG(DBG_ISOC, "USB Bandwidth Usage: %dMbit/Sec",
		       usbvision->usb_bandwidth);
	}
}

int usbvision_muxsel(struct usb_usbvision *usbvision, int channel)
{
	/* inputs #0 and #3 are constant for every SAA711x. */
	/* inputs #1 and #2 are variable for SAA7111 and SAA7113 */
	int mode[4] = { SAA7115_COMPOSITE0, 0, 0, SAA7115_COMPOSITE3 };
	int audio[] = { 1, 0, 0, 0 };
	/* channel 0 is TV with audiochannel 1 (tuner mono) */
	/* channel 1 is Composite with audio channel 0 (line in) */
	/* channel 2 is S-Video with audio channel 0 (line in) */
	/* channel 3 is additional video inputs to the device with audio channel 0 (line in) */

	RESTRICT_TO_RANGE(channel, 0, usbvision->video_inputs);
	usbvision->ctl_input = channel;

	/* set the new channel */
	/* Regular USB TV Tuners -> channel: 0 = Television, 1 = Composite, 2 = S-Video */
	/* Four video input devices -> channel: 0 = Chan White, 1 = Chan Green, 2 = Chan Yellow, 3 = Chan Red */

	switch (usbvision_device_data[usbvision->dev_model].codec) {
	case CODEC_SAA7113:
		mode[1] = SAA7115_COMPOSITE2;
		if (switch_svideo_input) {
			/* To handle problems with S-Video Input for
			 * some devices.  Use switch_svideo_input
			 * parameter when loading the module.*/
			mode[2] = SAA7115_COMPOSITE1;
		} else {
			mode[2] = SAA7115_SVIDEO1;
		}
		break;
	case CODEC_SAA7111:
	default:
		/* modes for saa7111 */
		mode[1] = SAA7115_COMPOSITE1;
		mode[2] = SAA7115_SVIDEO1;
		break;
	}
	call_all(usbvision, video, s_routing, mode[channel], 0, 0);
	usbvision_set_audio(usbvision, audio[channel]);
	return 0;
}