summaryrefslogtreecommitdiff
path: root/drivers/usb/serial/mos7840.c
blob: 6baacf64b21e4e11b73c47eae8ca9aa3fc24eafa (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
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Clean ups from Moschip version and a few ioctl implementations by:
 *	Paul B Schroeder <pschroeder "at" uplogix "dot" com>
 *
 * Originally based on drivers/usb/serial/io_edgeport.c which is:
 *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
 *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
 *
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/serial.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/uaccess.h>

#define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"

/*
 * 16C50 UART register defines
 */

#define LCR_BITS_5             0x00	/* 5 bits/char */
#define LCR_BITS_6             0x01	/* 6 bits/char */
#define LCR_BITS_7             0x02	/* 7 bits/char */
#define LCR_BITS_8             0x03	/* 8 bits/char */
#define LCR_BITS_MASK          0x03	/* Mask for bits/char field */

#define LCR_STOP_1             0x00	/* 1 stop bit */
#define LCR_STOP_1_5           0x04	/* 1.5 stop bits (if 5   bits/char) */
#define LCR_STOP_2             0x04	/* 2 stop bits   (if 6-8 bits/char) */
#define LCR_STOP_MASK          0x04	/* Mask for stop bits field */

#define LCR_PAR_NONE           0x00	/* No parity */
#define LCR_PAR_ODD            0x08	/* Odd parity */
#define LCR_PAR_EVEN           0x18	/* Even parity */
#define LCR_PAR_MARK           0x28	/* Force parity bit to 1 */
#define LCR_PAR_SPACE          0x38	/* Force parity bit to 0 */
#define LCR_PAR_MASK           0x38	/* Mask for parity field */

#define LCR_SET_BREAK          0x40	/* Set Break condition */
#define LCR_DL_ENABLE          0x80	/* Enable access to divisor latch */

#define MCR_DTR                0x01	/* Assert DTR */
#define MCR_RTS                0x02	/* Assert RTS */
#define MCR_OUT1               0x04	/* Loopback only: Sets state of RI */
#define MCR_MASTER_IE          0x08	/* Enable interrupt outputs */
#define MCR_LOOPBACK           0x10	/* Set internal (digital) loopback mode */
#define MCR_XON_ANY            0x20	/* Enable any char to exit XOFF mode */

#define MOS7840_MSR_CTS        0x10	/* Current state of CTS */
#define MOS7840_MSR_DSR        0x20	/* Current state of DSR */
#define MOS7840_MSR_RI         0x40	/* Current state of RI */
#define MOS7840_MSR_CD         0x80	/* Current state of CD */

/*
 * Defines used for sending commands to port
 */

#define MOS_WDR_TIMEOUT		5000	/* default urb timeout */

#define MOS_PORT1       0x0200
#define MOS_PORT2       0x0300
#define MOS_VENREG      0x0000
#define MOS_MAX_PORT	0x02
#define MOS_WRITE       0x0E
#define MOS_READ        0x0D

/* Requests */
#define MCS_RD_RTYPE    0xC0
#define MCS_WR_RTYPE    0x40
#define MCS_RDREQ       0x0D
#define MCS_WRREQ       0x0E
#define MCS_CTRL_TIMEOUT        500
#define VENDOR_READ_LENGTH      (0x01)

#define MAX_NAME_LEN    64

#define ZLP_REG1  0x3A		/* Zero_Flag_Reg1    58 */
#define ZLP_REG5  0x3E		/* Zero_Flag_Reg5    62 */

/* For higher baud Rates use TIOCEXBAUD */
#define TIOCEXBAUD     0x5462

/* vendor id and device id defines */

/* The native mos7840/7820 component */
#define USB_VENDOR_ID_MOSCHIP           0x9710
#define MOSCHIP_DEVICE_ID_7840          0x7840
#define MOSCHIP_DEVICE_ID_7820          0x7820
#define MOSCHIP_DEVICE_ID_7810          0x7810
/* The native component can have its vendor/device id's overridden
 * in vendor-specific implementations.  Such devices can be handled
 * by making a change here, in id_table.
 */
#define USB_VENDOR_ID_BANDB              0x0856
#define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
#define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
#define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
#define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
#define BANDB_DEVICE_ID_US9ML2_2         0xAC29
#define BANDB_DEVICE_ID_US9ML2_4         0xAC30
#define BANDB_DEVICE_ID_USPTL4_2         0xAC31
#define BANDB_DEVICE_ID_USPTL4_4         0xAC32
#define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
#define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
#define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
#define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
#define BANDB_DEVICE_ID_USOPTL2_4        0xAC24

/* This driver also supports
 * ATEN UC2324 device using Moschip MCS7840
 * ATEN UC2322 device using Moschip MCS7820
 */
#define USB_VENDOR_ID_ATENINTL		0x0557
#define ATENINTL_DEVICE_ID_UC2324	0x2011
#define ATENINTL_DEVICE_ID_UC2322	0x7820

/* Interrupt Routine Defines    */

#define SERIAL_IIR_RLS      0x06
#define SERIAL_IIR_MS       0x00

/*
 *  Emulation of the bit mask on the LINE STATUS REGISTER.
 */
#define SERIAL_LSR_DR       0x0001
#define SERIAL_LSR_OE       0x0002
#define SERIAL_LSR_PE       0x0004
#define SERIAL_LSR_FE       0x0008
#define SERIAL_LSR_BI       0x0010

#define MOS_MSR_DELTA_CTS   0x10
#define MOS_MSR_DELTA_DSR   0x20
#define MOS_MSR_DELTA_RI    0x40
#define MOS_MSR_DELTA_CD    0x80

/* Serial Port register Address */
#define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
#define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
#define LINE_CONTROL_REGISTER      ((__u16)(0x03))
#define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
#define LINE_STATUS_REGISTER       ((__u16)(0x05))
#define MODEM_STATUS_REGISTER      ((__u16)(0x06))
#define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
#define DIVISOR_LATCH_LSB          ((__u16)(0x00))
#define DIVISOR_LATCH_MSB          ((__u16)(0x01))

#define CLK_MULTI_REGISTER         ((__u16)(0x02))
#define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
#define GPIO_REGISTER              ((__u16)(0x07))

#define SERIAL_LCR_DLAB            ((__u16)(0x0080))

/*
 * URB POOL related defines
 */
#define NUM_URBS                        16	/* URB Count */
#define URB_TRANSFER_BUFFER_SIZE        32	/* URB Size  */

/* LED on/off milliseconds*/
#define LED_ON_MS	500
#define LED_OFF_MS	500

enum mos7840_flag {
	MOS7840_FLAG_CTRL_BUSY,
	MOS7840_FLAG_LED_BUSY,
};

static const struct usb_device_id id_table[] = {
	{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
	{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
	{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
	{USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
	{USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
	{}			/* terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table);

/* This structure holds all of the local port information */

struct moschip_port {
	int port_num;		/*Actual port number in the device(1,2,etc) */
	struct urb *write_urb;	/* write URB for this port */
	struct urb *read_urb;	/* read URB for this port */
	__u8 shadowLCR;		/* last LCR value received */
	__u8 shadowMCR;		/* last MCR value received */
	char open;
	char open_ports;
	struct usb_serial_port *port;	/* loop back to the owner of this object */

	/* Offsets */
	__u8 SpRegOffset;
	__u8 ControlRegOffset;
	__u8 DcrRegOffset;
	/* for processing control URBS in interrupt context */
	struct urb *control_urb;
	struct usb_ctrlrequest *dr;
	char *ctrl_buf;
	int MsrLsr;

	spinlock_t pool_lock;
	struct urb *write_urb_pool[NUM_URBS];
	char busy[NUM_URBS];
	bool read_urb_busy;

	/* For device(s) with LED indicator */
	bool has_led;
	struct timer_list led_timer1;	/* Timer for LED on */
	struct timer_list led_timer2;	/* Timer for LED off */
	struct urb *led_urb;
	struct usb_ctrlrequest *led_dr;

	unsigned long flags;
};

/*
 * mos7840_set_reg_sync
 * 	To set the Control register by calling usb_fill_control_urb function
 *	by passing usb_sndctrlpipe function as parameter.
 */

static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
				__u16 val)
{
	struct usb_device *dev = port->serial->dev;
	val = val & 0x00ff;
	dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);

	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
			       MCS_WR_RTYPE, val, reg, NULL, 0,
			       MOS_WDR_TIMEOUT);
}

/*
 * mos7840_get_reg_sync
 * 	To set the Uart register by calling usb_fill_control_urb function by
 *	passing usb_rcvctrlpipe function as parameter.
 */

static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
				__u16 *val)
{
	struct usb_device *dev = port->serial->dev;
	int ret = 0;
	u8 *buf;

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

	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
			      MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
			      MOS_WDR_TIMEOUT);
	if (ret < VENDOR_READ_LENGTH) {
		if (ret >= 0)
			ret = -EIO;
		goto out;
	}

	*val = buf[0];
	dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
out:
	kfree(buf);
	return ret;
}

/*
 * mos7840_set_uart_reg
 *	To set the Uart register by calling usb_fill_control_urb function by
 *	passing usb_sndctrlpipe function as parameter.
 */

static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
				__u16 val)
{

	struct usb_device *dev = port->serial->dev;
	val = val & 0x00ff;
	/* For the UART control registers, the application number need
	   to be Or'ed */
	if (port->serial->num_ports == 4) {
		val |= ((__u16)port->port_number + 1) << 8;
	} else {
		if (port->port_number == 0) {
			val |= ((__u16)port->port_number + 1) << 8;
		} else {
			val |= ((__u16)port->port_number + 2) << 8;
		}
	}
	dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
			       MCS_WR_RTYPE, val, reg, NULL, 0,
			       MOS_WDR_TIMEOUT);

}

/*
 * mos7840_get_uart_reg
 *	To set the Control register by calling usb_fill_control_urb function
 *	by passing usb_rcvctrlpipe function as parameter.
 */
static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
				__u16 *val)
{
	struct usb_device *dev = port->serial->dev;
	int ret = 0;
	__u16 Wval;
	u8 *buf;

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

	/* Wval  is same as application number */
	if (port->serial->num_ports == 4) {
		Wval = ((__u16)port->port_number + 1) << 8;
	} else {
		if (port->port_number == 0) {
			Wval = ((__u16)port->port_number + 1) << 8;
		} else {
			Wval = ((__u16)port->port_number + 2) << 8;
		}
	}
	dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
			      MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
			      MOS_WDR_TIMEOUT);
	if (ret < VENDOR_READ_LENGTH) {
		if (ret >= 0)
			ret = -EIO;
		goto out;
	}
	*val = buf[0];
out:
	kfree(buf);
	return ret;
}

static void mos7840_dump_serial_port(struct usb_serial_port *port,
				     struct moschip_port *mos7840_port)
{

	dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
	dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
	dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);

}

/************************************************************************/
/************************************************************************/
/*             I N T E R F A C E   F U N C T I O N S			*/
/*             I N T E R F A C E   F U N C T I O N S			*/
/************************************************************************/
/************************************************************************/

static inline void mos7840_set_port_private(struct usb_serial_port *port,
					    struct moschip_port *data)
{
	usb_set_serial_port_data(port, (void *)data);
}

static inline struct moschip_port *mos7840_get_port_private(struct
							    usb_serial_port
							    *port)
{
	return (struct moschip_port *)usb_get_serial_port_data(port);
}

static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
{
	struct moschip_port *mos7840_port;
	struct async_icount *icount;
	mos7840_port = port;
	if (new_msr &
	    (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
	     MOS_MSR_DELTA_CD)) {
		icount = &mos7840_port->port->icount;

		/* update input line counters */
		if (new_msr & MOS_MSR_DELTA_CTS)
			icount->cts++;
		if (new_msr & MOS_MSR_DELTA_DSR)
			icount->dsr++;
		if (new_msr & MOS_MSR_DELTA_CD)
			icount->dcd++;
		if (new_msr & MOS_MSR_DELTA_RI)
			icount->rng++;

		wake_up_interruptible(&port->port->port.delta_msr_wait);
	}
}

static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
{
	struct async_icount *icount;

	if (new_lsr & SERIAL_LSR_BI) {
		/*
		 * Parity and Framing errors only count if they
		 * occur exclusive of a break being
		 * received.
		 */
		new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
	}

	/* update input line counters */
	icount = &port->port->icount;
	if (new_lsr & SERIAL_LSR_BI)
		icount->brk++;
	if (new_lsr & SERIAL_LSR_OE)
		icount->overrun++;
	if (new_lsr & SERIAL_LSR_PE)
		icount->parity++;
	if (new_lsr & SERIAL_LSR_FE)
		icount->frame++;
}

/************************************************************************/
/************************************************************************/
/*            U S B  C A L L B A C K   F U N C T I O N S                */
/*            U S B  C A L L B A C K   F U N C T I O N S                */
/************************************************************************/
/************************************************************************/

static void mos7840_control_callback(struct urb *urb)
{
	unsigned char *data;
	struct moschip_port *mos7840_port;
	struct device *dev = &urb->dev->dev;
	__u8 regval = 0x0;
	int status = urb->status;

	mos7840_port = urb->context;

	switch (status) {
	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
		dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
		goto out;
	default:
		dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
		goto out;
	}

	dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
	dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
		mos7840_port->MsrLsr, mos7840_port->port_num);
	data = urb->transfer_buffer;
	regval = (__u8) data[0];
	dev_dbg(dev, "%s data is %x\n", __func__, regval);
	if (mos7840_port->MsrLsr == 0)
		mos7840_handle_new_msr(mos7840_port, regval);
	else if (mos7840_port->MsrLsr == 1)
		mos7840_handle_new_lsr(mos7840_port, regval);
out:
	clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
}

static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
			   __u16 *val)
{
	struct usb_device *dev = mcs->port->serial->dev;
	struct usb_ctrlrequest *dr = mcs->dr;
	unsigned char *buffer = mcs->ctrl_buf;
	int ret;

	if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
		return -EBUSY;

	dr->bRequestType = MCS_RD_RTYPE;
	dr->bRequest = MCS_RDREQ;
	dr->wValue = cpu_to_le16(Wval);	/* 0 */
	dr->wIndex = cpu_to_le16(reg);
	dr->wLength = cpu_to_le16(2);

	usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
			     (unsigned char *)dr, buffer, 2,
			     mos7840_control_callback, mcs);
	mcs->control_urb->transfer_buffer_length = 2;
	ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
	if (ret)
		clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);

	return ret;
}

static void mos7840_set_led_callback(struct urb *urb)
{
	switch (urb->status) {
	case 0:
		/* Success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* This urb is terminated, clean up */
		dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
			__func__, urb->status);
		break;
	default:
		dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
			__func__, urb->status);
	}
}

static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
				__u16 reg)
{
	struct usb_device *dev = mcs->port->serial->dev;
	struct usb_ctrlrequest *dr = mcs->led_dr;

	dr->bRequestType = MCS_WR_RTYPE;
	dr->bRequest = MCS_WRREQ;
	dr->wValue = cpu_to_le16(wval);
	dr->wIndex = cpu_to_le16(reg);
	dr->wLength = cpu_to_le16(0);

	usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
		(unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);

	usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
}

static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
				__u16 val)
{
	struct usb_device *dev = port->serial->dev;

	usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
			val, reg, NULL, 0, MOS_WDR_TIMEOUT);
}

static void mos7840_led_off(unsigned long arg)
{
	struct moschip_port *mcs = (struct moschip_port *) arg;

	/* Turn off LED */
	mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
	mod_timer(&mcs->led_timer2,
				jiffies + msecs_to_jiffies(LED_OFF_MS));
}

static void mos7840_led_flag_off(unsigned long arg)
{
	struct moschip_port *mcs = (struct moschip_port *) arg;

	clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
}

static void mos7840_led_activity(struct usb_serial_port *port)
{
	struct moschip_port *mos7840_port = usb_get_serial_port_data(port);

	if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
		return;

	mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
	mod_timer(&mos7840_port->led_timer1,
				jiffies + msecs_to_jiffies(LED_ON_MS));
}

/*****************************************************************************
 * mos7840_interrupt_callback
 *	this is the callback function for when we have received data on the
 *	interrupt endpoint.
 *****************************************************************************/

static void mos7840_interrupt_callback(struct urb *urb)
{
	int result;
	int length;
	struct moschip_port *mos7840_port;
	struct usb_serial *serial;
	__u16 Data;
	unsigned char *data;
	__u8 sp[5], st;
	int i, rv = 0;
	__u16 wval, wreg = 0;
	int status = urb->status;

	switch (status) {
	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
		dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
			__func__, status);
		return;
	default:
		dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
			__func__, status);
		goto exit;
	}

	length = urb->actual_length;
	data = urb->transfer_buffer;

	serial = urb->context;

	/* Moschip get 5 bytes
	 * Byte 1 IIR Port 1 (port.number is 0)
	 * Byte 2 IIR Port 2 (port.number is 1)
	 * Byte 3 IIR Port 3 (port.number is 2)
	 * Byte 4 IIR Port 4 (port.number is 3)
	 * Byte 5 FIFO status for both */

	if (length > 5) {
		dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
		return;
	}

	sp[0] = (__u8) data[0];
	sp[1] = (__u8) data[1];
	sp[2] = (__u8) data[2];
	sp[3] = (__u8) data[3];
	st = (__u8) data[4];

	for (i = 0; i < serial->num_ports; i++) {
		mos7840_port = mos7840_get_port_private(serial->port[i]);
		wval = ((__u16)serial->port[i]->port_number + 1) << 8;
		if (mos7840_port->open) {
			if (sp[i] & 0x01) {
				dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
			} else {
				switch (sp[i] & 0x0f) {
				case SERIAL_IIR_RLS:
					dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
					dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
					mos7840_port->MsrLsr = 1;
					wreg = LINE_STATUS_REGISTER;
					break;
				case SERIAL_IIR_MS:
					dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
					mos7840_port->MsrLsr = 0;
					wreg = MODEM_STATUS_REGISTER;
					break;
				}
				rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
			}
		}
	}
	if (!(rv < 0))
		/* the completion handler for the control urb will resubmit */
		return;
exit:
	result = usb_submit_urb(urb, GFP_ATOMIC);
	if (result) {
		dev_err(&urb->dev->dev,
			"%s - Error %d submitting interrupt urb\n",
			__func__, result);
	}
}

static int mos7840_port_paranoia_check(struct usb_serial_port *port,
				       const char *function)
{
	if (!port) {
		pr_debug("%s - port == NULL\n", function);
		return -1;
	}
	if (!port->serial) {
		pr_debug("%s - port->serial == NULL\n", function);
		return -1;
	}

	return 0;
}

/* Inline functions to check the sanity of a pointer that is passed to us */
static int mos7840_serial_paranoia_check(struct usb_serial *serial,
					 const char *function)
{
	if (!serial) {
		pr_debug("%s - serial == NULL\n", function);
		return -1;
	}
	if (!serial->type) {
		pr_debug("%s - serial->type == NULL!\n", function);
		return -1;
	}

	return 0;
}

static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
						 const char *function)
{
	/* if no port was specified, or it fails a paranoia check */
	if (!port ||
	    mos7840_port_paranoia_check(port, function) ||
	    mos7840_serial_paranoia_check(port->serial, function)) {
		/* then say that we don't have a valid usb_serial thing,
		 * which will end up genrating -ENODEV return values */
		return NULL;
	}

	return port->serial;
}

/*****************************************************************************
 * mos7840_bulk_in_callback
 *	this is the callback function for when we have received data on the
 *	bulk in endpoint.
 *****************************************************************************/

static void mos7840_bulk_in_callback(struct urb *urb)
{
	int retval;
	unsigned char *data;
	struct usb_serial *serial;
	struct usb_serial_port *port;
	struct moschip_port *mos7840_port;
	int status = urb->status;

	mos7840_port = urb->context;
	if (!mos7840_port)
		return;

	if (status) {
		dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
		mos7840_port->read_urb_busy = false;
		return;
	}

	port = mos7840_port->port;
	if (mos7840_port_paranoia_check(port, __func__)) {
		mos7840_port->read_urb_busy = false;
		return;
	}

	serial = mos7840_get_usb_serial(port, __func__);
	if (!serial) {
		mos7840_port->read_urb_busy = false;
		return;
	}

	data = urb->transfer_buffer;
	usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);

	if (urb->actual_length) {
		struct tty_port *tport = &mos7840_port->port->port;
		tty_insert_flip_string(tport, data, urb->actual_length);
		tty_flip_buffer_push(tport);
		port->icount.rx += urb->actual_length;
		dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
	}

	if (!mos7840_port->read_urb) {
		dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
		mos7840_port->read_urb_busy = false;
		return;
	}

	if (mos7840_port->has_led)
		mos7840_led_activity(port);

	mos7840_port->read_urb_busy = true;
	retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);

	if (retval) {
		dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
		mos7840_port->read_urb_busy = false;
	}
}

/*****************************************************************************
 * mos7840_bulk_out_data_callback
 *	this is the callback function for when we have finished sending
 *	serial data on the bulk out endpoint.
 *****************************************************************************/

static void mos7840_bulk_out_data_callback(struct urb *urb)
{
	struct moschip_port *mos7840_port;
	struct usb_serial_port *port;
	int status = urb->status;
	int i;

	mos7840_port = urb->context;
	port = mos7840_port->port;
	spin_lock(&mos7840_port->pool_lock);
	for (i = 0; i < NUM_URBS; i++) {
		if (urb == mos7840_port->write_urb_pool[i]) {
			mos7840_port->busy[i] = 0;
			break;
		}
	}
	spin_unlock(&mos7840_port->pool_lock);

	if (status) {
		dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
		return;
	}

	if (mos7840_port_paranoia_check(port, __func__))
		return;

	if (mos7840_port->open)
		tty_port_tty_wakeup(&port->port);

}

/************************************************************************/
/*       D R I V E R  T T Y  I N T E R F A C E  F U N C T I O N S       */
/************************************************************************/

/*****************************************************************************
 * mos7840_open
 *	this function is called by the tty driver when a port is opened
 *	If successful, we return 0
 *	Otherwise we return a negative error number.
 *****************************************************************************/

static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
{
	int response;
	int j;
	struct usb_serial *serial;
	struct urb *urb;
	__u16 Data;
	int status;
	struct moschip_port *mos7840_port;
	struct moschip_port *port0;

	if (mos7840_port_paranoia_check(port, __func__))
		return -ENODEV;

	serial = port->serial;

	if (mos7840_serial_paranoia_check(serial, __func__))
		return -ENODEV;

	mos7840_port = mos7840_get_port_private(port);
	port0 = mos7840_get_port_private(serial->port[0]);

	if (mos7840_port == NULL || port0 == NULL)
		return -ENODEV;

	usb_clear_halt(serial->dev, port->write_urb->pipe);
	usb_clear_halt(serial->dev, port->read_urb->pipe);
	port0->open_ports++;

	/* Initialising the write urb pool */
	for (j = 0; j < NUM_URBS; ++j) {
		urb = usb_alloc_urb(0, GFP_KERNEL);
		mos7840_port->write_urb_pool[j] = urb;
		if (!urb)
			continue;

		urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
								GFP_KERNEL);
		if (!urb->transfer_buffer) {
			usb_free_urb(urb);
			mos7840_port->write_urb_pool[j] = NULL;
			continue;
		}
	}

/*****************************************************************************
 * Initialize MCS7840 -- Write Init values to corresponding Registers
 *
 * Register Index
 * 1 : IER
 * 2 : FCR
 * 3 : LCR
 * 4 : MCR
 *
 * 0x08 : SP1/2 Control Reg
 *****************************************************************************/

	/* NEED to check the following Block */

	Data = 0x0;
	status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
	if (status < 0) {
		dev_dbg(&port->dev, "Reading Spreg failed\n");
		goto err;
	}
	Data |= 0x80;
	status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
	if (status < 0) {
		dev_dbg(&port->dev, "writing Spreg failed\n");
		goto err;
	}

	Data &= ~0x80;
	status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
	if (status < 0) {
		dev_dbg(&port->dev, "writing Spreg failed\n");
		goto err;
	}
	/* End of block to be checked */

	Data = 0x0;
	status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
									&Data);
	if (status < 0) {
		dev_dbg(&port->dev, "Reading Controlreg failed\n");
		goto err;
	}
	Data |= 0x08;		/* Driver done bit */
	Data |= 0x20;		/* rx_disable */
	status = mos7840_set_reg_sync(port,
				mos7840_port->ControlRegOffset, Data);
	if (status < 0) {
		dev_dbg(&port->dev, "writing Controlreg failed\n");
		goto err;
	}
	/* do register settings here */
	/* Set all regs to the device default values. */
	/***********************************
	 * First Disable all interrupts.
	 ***********************************/
	Data = 0x00;
	status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
	if (status < 0) {
		dev_dbg(&port->dev, "disabling interrupts failed\n");
		goto err;
	}
	/* Set FIFO_CONTROL_REGISTER to the default value */
	Data = 0x00;
	status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
	if (status < 0) {
		dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
		goto err;
	}

	Data = 0xcf;
	status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
	if (status < 0) {
		dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
		goto err;
	}

	Data = 0x03;
	status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
	mos7840_port->shadowLCR = Data;

	Data = 0x0b;
	status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
	mos7840_port->shadowMCR = Data;

	Data = 0x00;
	status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
	mos7840_port->shadowLCR = Data;

	Data |= SERIAL_LCR_DLAB;	/* data latch enable in LCR 0x80 */
	status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);

	Data = 0x0c;
	status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);

	Data = 0x0;
	status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);

	Data = 0x00;
	status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);

	Data = Data & ~SERIAL_LCR_DLAB;
	status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
	mos7840_port->shadowLCR = Data;

	/* clearing Bulkin and Bulkout Fifo */
	Data = 0x0;
	status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);

	Data = Data | 0x0c;
	status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);

	Data = Data & ~0x0c;
	status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
	/* Finally enable all interrupts */
	Data = 0x0c;
	status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);

	/* clearing rx_disable */
	Data = 0x0;
	status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
									&Data);
	Data = Data & ~0x20;
	status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
									Data);

	/* rx_negate */
	Data = 0x0;
	status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
									&Data);
	Data = Data | 0x10;
	status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
									Data);

	/* Check to see if we've set up our endpoint info yet    *
	 * (can't set it up in mos7840_startup as the structures *
	 * were not set up at that time.)                        */
	if (port0->open_ports == 1) {
		/* FIXME: Buffer never NULL, so URB is not submitted. */
		if (serial->port[0]->interrupt_in_buffer == NULL) {
			/* set up interrupt urb */
			usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
				serial->dev,
				usb_rcvintpipe(serial->dev,
				serial->port[0]->interrupt_in_endpointAddress),
				serial->port[0]->interrupt_in_buffer,
				serial->port[0]->interrupt_in_urb->
				transfer_buffer_length,
				mos7840_interrupt_callback,
				serial,
				serial->port[0]->interrupt_in_urb->interval);

			/* start interrupt read for mos7840               *
			 * will continue as long as mos7840 is connected  */

			response =
			    usb_submit_urb(serial->port[0]->interrupt_in_urb,
					   GFP_KERNEL);
			if (response) {
				dev_err(&port->dev, "%s - Error %d submitting "
					"interrupt urb\n", __func__, response);
			}

		}

	}

	/* see if we've set up our endpoint info yet   *
	 * (can't set it up in mos7840_startup as the  *
	 * structures were not set up at that time.)   */

	dev_dbg(&port->dev, "port number is %d\n", port->port_number);
	dev_dbg(&port->dev, "minor number is %d\n", port->minor);
	dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
	dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
	dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
	dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
	mos7840_port->read_urb = port->read_urb;

	/* set up our bulk in urb */
	if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
		usb_fill_bulk_urb(mos7840_port->read_urb,
			serial->dev,
			usb_rcvbulkpipe(serial->dev,
				(port->bulk_in_endpointAddress) + 2),
			port->bulk_in_buffer,
			mos7840_port->read_urb->transfer_buffer_length,
			mos7840_bulk_in_callback, mos7840_port);
	} else {
		usb_fill_bulk_urb(mos7840_port->read_urb,
			serial->dev,
			usb_rcvbulkpipe(serial->dev,
				port->bulk_in_endpointAddress),
			port->bulk_in_buffer,
			mos7840_port->read_urb->transfer_buffer_length,
			mos7840_bulk_in_callback, mos7840_port);
	}

	dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
	mos7840_port->read_urb_busy = true;
	response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
	if (response) {
		dev_err(&port->dev, "%s - Error %d submitting control urb\n",
			__func__, response);
		mos7840_port->read_urb_busy = false;
	}

	/* initialize our port settings */
	/* Must set to enable ints! */
	mos7840_port->shadowMCR = MCR_MASTER_IE;
	/* send a open port command */
	mos7840_port->open = 1;
	/* mos7840_change_port_settings(mos7840_port,old_termios); */

	return 0;
err:
	for (j = 0; j < NUM_URBS; ++j) {
		urb = mos7840_port->write_urb_pool[j];
		if (!urb)
			continue;
		kfree(urb->transfer_buffer);
		usb_free_urb(urb);
	}
	return status;
}

/*****************************************************************************
 * mos7840_chars_in_buffer
 *	this function is called by the tty driver when it wants to know how many
 *	bytes of data we currently have outstanding in the port (data that has
 *	been written, but hasn't made it out the port yet)
 *	If successful, we return the number of bytes left to be written in the
 *	system,
 *	Otherwise we return zero.
 *****************************************************************************/

static int mos7840_chars_in_buffer(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	int i;
	int chars = 0;
	unsigned long flags;
	struct moschip_port *mos7840_port;

	if (mos7840_port_paranoia_check(port, __func__))
		return 0;

	mos7840_port = mos7840_get_port_private(port);
	if (mos7840_port == NULL)
		return 0;

	spin_lock_irqsave(&mos7840_port->pool_lock, flags);
	for (i = 0; i < NUM_URBS; ++i) {
		if (mos7840_port->busy[i]) {
			struct urb *urb = mos7840_port->write_urb_pool[i];
			chars += urb->transfer_buffer_length;
		}
	}
	spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
	dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
	return chars;

}

/*****************************************************************************
 * mos7840_close
 *	this function is called by the tty driver when a port is closed
 *****************************************************************************/

static void mos7840_close(struct usb_serial_port *port)
{
	struct usb_serial *serial;
	struct moschip_port *mos7840_port;
	struct moschip_port *port0;
	int j;
	__u16 Data;

	if (mos7840_port_paranoia_check(port, __func__))
		return;

	serial = mos7840_get_usb_serial(port, __func__);
	if (!serial)
		return;

	mos7840_port = mos7840_get_port_private(port);
	port0 = mos7840_get_port_private(serial->port[0]);

	if (mos7840_port == NULL || port0 == NULL)
		return;

	for (j = 0; j < NUM_URBS; ++j)
		usb_kill_urb(mos7840_port->write_urb_pool[j]);

	/* Freeing Write URBs */
	for (j = 0; j < NUM_URBS; ++j) {
		if (mos7840_port->write_urb_pool[j]) {
			kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
			usb_free_urb(mos7840_port->write_urb_pool[j]);
		}
	}

	usb_kill_urb(mos7840_port->write_urb);
	usb_kill_urb(mos7840_port->read_urb);
	mos7840_port->read_urb_busy = false;

	port0->open_ports--;
	dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
	if (port0->open_ports == 0) {
		if (serial->port[0]->interrupt_in_urb) {
			dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
			usb_kill_urb(serial->port[0]->interrupt_in_urb);
		}
	}

	if (mos7840_port->write_urb) {
		/* if this urb had a transfer buffer already (old tx) free it */
		kfree(mos7840_port->write_urb->transfer_buffer);
		usb_free_urb(mos7840_port->write_urb);
	}

	Data = 0x0;
	mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);

	Data = 0x00;
	mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);

	mos7840_port->open = 0;
}

/*****************************************************************************
 * mos7840_break
 *	this function sends a break to the port
 *****************************************************************************/
static void mos7840_break(struct tty_struct *tty, int break_state)
{
	struct usb_serial_port *port = tty->driver_data;
	unsigned char data;
	struct usb_serial *serial;
	struct moschip_port *mos7840_port;

	if (mos7840_port_paranoia_check(port, __func__))
		return;

	serial = mos7840_get_usb_serial(port, __func__);
	if (!serial)
		return;

	mos7840_port = mos7840_get_port_private(port);

	if (mos7840_port == NULL)
		return;

	if (break_state == -1)
		data = mos7840_port->shadowLCR | LCR_SET_BREAK;
	else
		data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;

	/* FIXME: no locking on shadowLCR anywhere in driver */
	mos7840_port->shadowLCR = data;
	dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
	mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
			     mos7840_port->shadowLCR);
}

/*****************************************************************************
 * mos7840_write_room
 *	this function is called by the tty driver when it wants to know how many
 *	bytes of data we can accept for a specific port.
 *	If successful, we return the amount of room that we have for this port
 *	Otherwise we return a negative error number.
 *****************************************************************************/

static int mos7840_write_room(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	int i;
	int room = 0;
	unsigned long flags;
	struct moschip_port *mos7840_port;

	if (mos7840_port_paranoia_check(port, __func__))
		return -1;

	mos7840_port = mos7840_get_port_private(port);
	if (mos7840_port == NULL)
		return -1;

	spin_lock_irqsave(&mos7840_port->pool_lock, flags);
	for (i = 0; i < NUM_URBS; ++i) {
		if (!mos7840_port->busy[i])
			room += URB_TRANSFER_BUFFER_SIZE;
	}
	spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);

	room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
	dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
	return room;

}

/*****************************************************************************
 * mos7840_write
 *	this function is called by the tty driver when data should be written to
 *	the port.
 *	If successful, we return the number of bytes written, otherwise we
 *      return a negative error number.
 *****************************************************************************/

static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
			 const unsigned char *data, int count)
{
	int status;
	int i;
	int bytes_sent = 0;
	int transfer_size;
	unsigned long flags;

	struct moschip_port *mos7840_port;
	struct usb_serial *serial;
	struct urb *urb;
	/* __u16 Data; */
	const unsigned char *current_position = data;
	unsigned char *data1;

	if (mos7840_port_paranoia_check(port, __func__))
		return -1;

	serial = port->serial;
	if (mos7840_serial_paranoia_check(serial, __func__))
		return -1;

	mos7840_port = mos7840_get_port_private(port);
	if (mos7840_port == NULL)
		return -1;

	/* try to find a free urb in the list */
	urb = NULL;

	spin_lock_irqsave(&mos7840_port->pool_lock, flags);
	for (i = 0; i < NUM_URBS; ++i) {
		if (!mos7840_port->busy[i]) {
			mos7840_port->busy[i] = 1;
			urb = mos7840_port->write_urb_pool[i];
			dev_dbg(&port->dev, "URB:%d\n", i);
			break;
		}
	}
	spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);

	if (urb == NULL) {
		dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
		goto exit;
	}

	if (urb->transfer_buffer == NULL) {
		urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
					       GFP_ATOMIC);
		if (!urb->transfer_buffer)
			goto exit;
	}
	transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);

	memcpy(urb->transfer_buffer, current_position, transfer_size);

	/* fill urb with data and submit  */
	if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
		usb_fill_bulk_urb(urb,
			serial->dev,
			usb_sndbulkpipe(serial->dev,
				(port->bulk_out_endpointAddress) + 2),
			urb->transfer_buffer,
			transfer_size,
			mos7840_bulk_out_data_callback, mos7840_port);
	} else {
		usb_fill_bulk_urb(urb,
			serial->dev,
			usb_sndbulkpipe(serial->dev,
				port->bulk_out_endpointAddress),
			urb->transfer_buffer,
			transfer_size,
			mos7840_bulk_out_data_callback, mos7840_port);
	}

	data1 = urb->transfer_buffer;
	dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);

	if (mos7840_port->has_led)
		mos7840_led_activity(port);

	/* send it down the pipe */
	status = usb_submit_urb(urb, GFP_ATOMIC);

	if (status) {
		mos7840_port->busy[i] = 0;
		dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
			"with status = %d\n", __func__, status);
		bytes_sent = status;
		goto exit;
	}
	bytes_sent = transfer_size;
	port->icount.tx += transfer_size;
	dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
exit:
	return bytes_sent;

}

/*****************************************************************************
 * mos7840_throttle
 *	this function is called by the tty driver when it wants to stop the data
 *	being read from the port.
 *****************************************************************************/

static void mos7840_throttle(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct moschip_port *mos7840_port;
	int status;

	if (mos7840_port_paranoia_check(port, __func__))
		return;

	mos7840_port = mos7840_get_port_private(port);

	if (mos7840_port == NULL)
		return;

	if (!mos7840_port->open) {
		dev_dbg(&port->dev, "%s", "port not opened\n");
		return;
	}

	/* if we are implementing XON/XOFF, send the stop character */
	if (I_IXOFF(tty)) {
		unsigned char stop_char = STOP_CHAR(tty);
		status = mos7840_write(tty, port, &stop_char, 1);
		if (status <= 0)
			return;
	}
	/* if we are implementing RTS/CTS, toggle that line */
	if (C_CRTSCTS(tty)) {
		mos7840_port->shadowMCR &= ~MCR_RTS;
		status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
					 mos7840_port->shadowMCR);
		if (status < 0)
			return;
	}
}

/*****************************************************************************
 * mos7840_unthrottle
 *	this function is called by the tty driver when it wants to resume
 *	the data being read from the port (called after mos7840_throttle is
 *	called)
 *****************************************************************************/
static void mos7840_unthrottle(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	int status;
	struct moschip_port *mos7840_port = mos7840_get_port_private(port);

	if (mos7840_port_paranoia_check(port, __func__))
		return;

	if (mos7840_port == NULL)
		return;

	if (!mos7840_port->open) {
		dev_dbg(&port->dev, "%s - port not opened\n", __func__);
		return;
	}

	/* if we are implementing XON/XOFF, send the start character */
	if (I_IXOFF(tty)) {
		unsigned char start_char = START_CHAR(tty);
		status = mos7840_write(tty, port, &start_char, 1);
		if (status <= 0)
			return;
	}

	/* if we are implementing RTS/CTS, toggle that line */
	if (C_CRTSCTS(tty)) {
		mos7840_port->shadowMCR |= MCR_RTS;
		status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
					 mos7840_port->shadowMCR);
		if (status < 0)
			return;
	}
}

static int mos7840_tiocmget(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct moschip_port *mos7840_port;
	unsigned int result;
	__u16 msr;
	__u16 mcr;
	int status;
	mos7840_port = mos7840_get_port_private(port);

	if (mos7840_port == NULL)
		return -ENODEV;

	status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
	if (status < 0)
		return -EIO;
	status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
	if (status < 0)
		return -EIO;
	result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
	    | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
	    | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
	    | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
	    | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
	    | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
	    | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);

	dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);

	return result;
}

static int mos7840_tiocmset(struct tty_struct *tty,
			    unsigned int set, unsigned int clear)
{
	struct usb_serial_port *port = tty->driver_data;
	struct moschip_port *mos7840_port;
	unsigned int mcr;
	int status;

	mos7840_port = mos7840_get_port_private(port);

	if (mos7840_port == NULL)
		return -ENODEV;

	/* FIXME: What locks the port registers ? */
	mcr = mos7840_port->shadowMCR;
	if (clear & TIOCM_RTS)
		mcr &= ~MCR_RTS;
	if (clear & TIOCM_DTR)
		mcr &= ~MCR_DTR;
	if (clear & TIOCM_LOOP)
		mcr &= ~MCR_LOOPBACK;

	if (set & TIOCM_RTS)
		mcr |= MCR_RTS;
	if (set & TIOCM_DTR)
		mcr |= MCR_DTR;
	if (set & TIOCM_LOOP)
		mcr |= MCR_LOOPBACK;

	mos7840_port->shadowMCR = mcr;

	status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
	if (status < 0) {
		dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
		return status;
	}

	return 0;
}

/*****************************************************************************
 * mos7840_calc_baud_rate_divisor
 *	this function calculates the proper baud rate divisor for the specified
 *	baud rate.
 *****************************************************************************/
static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
					  int baudRate, int *divisor,
					  __u16 *clk_sel_val)
{
	dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);

	if (baudRate <= 115200) {
		*divisor = 115200 / baudRate;
		*clk_sel_val = 0x0;
	}
	if ((baudRate > 115200) && (baudRate <= 230400)) {
		*divisor = 230400 / baudRate;
		*clk_sel_val = 0x10;
	} else if ((baudRate > 230400) && (baudRate <= 403200)) {
		*divisor = 403200 / baudRate;
		*clk_sel_val = 0x20;
	} else if ((baudRate > 403200) && (baudRate <= 460800)) {
		*divisor = 460800 / baudRate;
		*clk_sel_val = 0x30;
	} else if ((baudRate > 460800) && (baudRate <= 806400)) {
		*divisor = 806400 / baudRate;
		*clk_sel_val = 0x40;
	} else if ((baudRate > 806400) && (baudRate <= 921600)) {
		*divisor = 921600 / baudRate;
		*clk_sel_val = 0x50;
	} else if ((baudRate > 921600) && (baudRate <= 1572864)) {
		*divisor = 1572864 / baudRate;
		*clk_sel_val = 0x60;
	} else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
		*divisor = 3145728 / baudRate;
		*clk_sel_val = 0x70;
	}
	return 0;
}

/*****************************************************************************
 * mos7840_send_cmd_write_baud_rate
 *	this function sends the proper command to change the baud rate of the
 *	specified port.
 *****************************************************************************/

static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
					    int baudRate)
{
	int divisor = 0;
	int status;
	__u16 Data;
	unsigned char number;
	__u16 clk_sel_val;
	struct usb_serial_port *port;

	if (mos7840_port == NULL)
		return -1;

	port = mos7840_port->port;
	if (mos7840_port_paranoia_check(port, __func__))
		return -1;

	if (mos7840_serial_paranoia_check(port->serial, __func__))
		return -1;

	number = mos7840_port->port->port_number;

	dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
	/* reset clk_uart_sel in spregOffset */
	if (baudRate > 115200) {
#ifdef HW_flow_control
		/* NOTE: need to see the pther register to modify */
		/* setting h/w flow control bit to 1 */
		Data = 0x2b;
		mos7840_port->shadowMCR = Data;
		status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
									Data);
		if (status < 0) {
			dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
			return -1;
		}
#endif

	} else {
#ifdef HW_flow_control
		/* setting h/w flow control bit to 0 */
		Data = 0xb;
		mos7840_port->shadowMCR = Data;
		status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
									Data);
		if (status < 0) {
			dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
			return -1;
		}
#endif

	}

	if (1) {		/* baudRate <= 115200) */
		clk_sel_val = 0x0;
		Data = 0x0;
		status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
						   &clk_sel_val);
		status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
								 &Data);
		if (status < 0) {
			dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
			return -1;
		}
		Data = (Data & 0x8f) | clk_sel_val;
		status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
								Data);
		if (status < 0) {
			dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
			return -1;
		}
		/* Calculate the Divisor */

		if (status) {
			dev_err(&port->dev, "%s - bad baud rate\n", __func__);
			return status;
		}
		/* Enable access to divisor latch */
		Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
		mos7840_port->shadowLCR = Data;
		mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);

		/* Write the divisor */
		Data = (unsigned char)(divisor & 0xff);
		dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
		mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);

		Data = (unsigned char)((divisor & 0xff00) >> 8);
		dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
		mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);

		/* Disable access to divisor latch */
		Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
		mos7840_port->shadowLCR = Data;
		mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);

	}
	return status;
}

/*****************************************************************************
 * mos7840_change_port_settings
 *	This routine is called to set the UART on the device to match
 *      the specified new settings.
 *****************************************************************************/

static void mos7840_change_port_settings(struct tty_struct *tty,
	struct moschip_port *mos7840_port, struct ktermios *old_termios)
{
	int baud;
	unsigned cflag;
	unsigned iflag;
	__u8 lData;
	__u8 lParity;
	__u8 lStop;
	int status;
	__u16 Data;
	struct usb_serial_port *port;
	struct usb_serial *serial;

	if (mos7840_port == NULL)
		return;

	port = mos7840_port->port;

	if (mos7840_port_paranoia_check(port, __func__))
		return;

	if (mos7840_serial_paranoia_check(port->serial, __func__))
		return;

	serial = port->serial;

	if (!mos7840_port->open) {
		dev_dbg(&port->dev, "%s - port not opened\n", __func__);
		return;
	}

	lData = LCR_BITS_8;
	lStop = LCR_STOP_1;
	lParity = LCR_PAR_NONE;

	cflag = tty->termios.c_cflag;
	iflag = tty->termios.c_iflag;

	/* Change the number of bits */
	switch (cflag & CSIZE) {
	case CS5:
		lData = LCR_BITS_5;
		break;

	case CS6:
		lData = LCR_BITS_6;
		break;

	case CS7:
		lData = LCR_BITS_7;
		break;

	default:
	case CS8:
		lData = LCR_BITS_8;
		break;
	}

	/* Change the Parity bit */
	if (cflag & PARENB) {
		if (cflag & PARODD) {
			lParity = LCR_PAR_ODD;
			dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
		} else {
			lParity = LCR_PAR_EVEN;
			dev_dbg(&port->dev, "%s - parity = even\n", __func__);
		}

	} else {
		dev_dbg(&port->dev, "%s - parity = none\n", __func__);
	}

	if (cflag & CMSPAR)
		lParity = lParity | 0x20;

	/* Change the Stop bit */
	if (cflag & CSTOPB) {
		lStop = LCR_STOP_2;
		dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
	} else {
		lStop = LCR_STOP_1;
		dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
	}

	/* Update the LCR with the correct value */
	mos7840_port->shadowLCR &=
	    ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
	mos7840_port->shadowLCR |= (lData | lParity | lStop);

	dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
		mos7840_port->shadowLCR);
	/* Disable Interrupts */
	Data = 0x00;
	mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);

	Data = 0x00;
	mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);

	Data = 0xcf;
	mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);

	/* Send the updated LCR value to the mos7840 */
	Data = mos7840_port->shadowLCR;

	mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);

	Data = 0x00b;
	mos7840_port->shadowMCR = Data;
	mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
	Data = 0x00b;
	mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);

	/* set up the MCR register and send it to the mos7840 */

	mos7840_port->shadowMCR = MCR_MASTER_IE;
	if (cflag & CBAUD)
		mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);

	if (cflag & CRTSCTS)
		mos7840_port->shadowMCR |= (MCR_XON_ANY);
	else
		mos7840_port->shadowMCR &= ~(MCR_XON_ANY);

	Data = mos7840_port->shadowMCR;
	mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);

	/* Determine divisor based on baud rate */
	baud = tty_get_baud_rate(tty);

	if (!baud) {
		/* pick a default, any default... */
		dev_dbg(&port->dev, "%s", "Picked default baud...\n");
		baud = 9600;
	}

	dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
	status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);

	/* Enable Interrupts */
	Data = 0x0c;
	mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);

	if (!mos7840_port->read_urb_busy) {
		mos7840_port->read_urb_busy = true;
		status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
		if (status) {
			dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
			    status);
			mos7840_port->read_urb_busy = false;
		}
	}
	dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
		mos7840_port->shadowLCR);
}

/*****************************************************************************
 * mos7840_set_termios
 *	this function is called by the tty driver when it wants to change
 *	the termios structure
 *****************************************************************************/

static void mos7840_set_termios(struct tty_struct *tty,
				struct usb_serial_port *port,
				struct ktermios *old_termios)
{
	int status;
	unsigned int cflag;
	struct usb_serial *serial;
	struct moschip_port *mos7840_port;

	if (mos7840_port_paranoia_check(port, __func__))
		return;

	serial = port->serial;

	if (mos7840_serial_paranoia_check(serial, __func__))
		return;

	mos7840_port = mos7840_get_port_private(port);

	if (mos7840_port == NULL)
		return;

	if (!mos7840_port->open) {
		dev_dbg(&port->dev, "%s - port not opened\n", __func__);
		return;
	}

	dev_dbg(&port->dev, "%s", "setting termios - \n");

	cflag = tty->termios.c_cflag;

	dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
		tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
	dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
		old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));

	/* change the port settings to the new ones specified */

	mos7840_change_port_settings(tty, mos7840_port, old_termios);

	if (!mos7840_port->read_urb) {
		dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
		return;
	}

	if (!mos7840_port->read_urb_busy) {
		mos7840_port->read_urb_busy = true;
		status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
		if (status) {
			dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
			    status);
			mos7840_port->read_urb_busy = false;
		}
	}
}

/*****************************************************************************
 * mos7840_get_lsr_info - get line status register info
 *
 * Purpose: Let user call ioctl() to get info when the UART physically
 * 	    is emptied.  On bus types like RS485, the transmitter must
 * 	    release the bus after transmitting. This must be done when
 * 	    the transmit shift register is empty, not be done when the
 * 	    transmit holding register is empty.  This functionality
 * 	    allows an RS485 driver to be written in user space.
 *****************************************************************************/

static int mos7840_get_lsr_info(struct tty_struct *tty,
				unsigned int __user *value)
{
	int count;
	unsigned int result = 0;

	count = mos7840_chars_in_buffer(tty);
	if (count == 0)
		result = TIOCSER_TEMT;

	if (copy_to_user(value, &result, sizeof(int)))
		return -EFAULT;
	return 0;
}

/*****************************************************************************
 * mos7840_get_serial_info
 *      function to get information about serial port
 *****************************************************************************/

static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
				   struct serial_struct __user *retinfo)
{
	struct serial_struct tmp;

	if (mos7840_port == NULL)
		return -1;

	if (!retinfo)
		return -EFAULT;

	memset(&tmp, 0, sizeof(tmp));

	tmp.type = PORT_16550A;
	tmp.line = mos7840_port->port->minor;
	tmp.port = mos7840_port->port->port_number;
	tmp.irq = 0;
	tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
	tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
	tmp.baud_base = 9600;
	tmp.close_delay = 5 * HZ;
	tmp.closing_wait = 30 * HZ;

	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
		return -EFAULT;
	return 0;
}

/*****************************************************************************
 * SerialIoctl
 *	this function handles any ioctl calls to the driver
 *****************************************************************************/

static int mos7840_ioctl(struct tty_struct *tty,
			 unsigned int cmd, unsigned long arg)
{
	struct usb_serial_port *port = tty->driver_data;
	void __user *argp = (void __user *)arg;
	struct moschip_port *mos7840_port;

	if (mos7840_port_paranoia_check(port, __func__))
		return -1;

	mos7840_port = mos7840_get_port_private(port);

	if (mos7840_port == NULL)
		return -1;

	switch (cmd) {
		/* return number of bytes available */

	case TIOCSERGETLSR:
		dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
		return mos7840_get_lsr_info(tty, argp);

	case TIOCGSERIAL:
		dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
		return mos7840_get_serial_info(mos7840_port, argp);

	case TIOCSSERIAL:
		dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
		break;
	default:
		break;
	}
	return -ENOIOCTLCMD;
}

static int mos7810_check(struct usb_serial *serial)
{
	int i, pass_count = 0;
	u8 *buf;
	__u16 data = 0, mcr_data = 0;
	__u16 test_pattern = 0x55AA;
	int res;

	buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
	if (!buf)
		return 0;	/* failed to identify 7810 */

	/* Store MCR setting */
	res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
		MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
		buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
	if (res == VENDOR_READ_LENGTH)
		mcr_data = *buf;

	for (i = 0; i < 16; i++) {
		/* Send the 1-bit test pattern out to MCS7810 test pin */
		usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
			MCS_WRREQ, MCS_WR_RTYPE,
			(0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
			MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);

		/* Read the test pattern back */
		res = usb_control_msg(serial->dev,
				usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
				MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
				VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
		if (res == VENDOR_READ_LENGTH)
			data = *buf;

		/* If this is a MCS7810 device, both test patterns must match */
		if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
			break;

		pass_count++;
	}

	/* Restore MCR setting */
	usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
		MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
		0, MOS_WDR_TIMEOUT);

	kfree(buf);

	if (pass_count == 16)
		return 1;

	return 0;
}

static int mos7840_probe(struct usb_serial *serial,
				const struct usb_device_id *id)
{
	u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
	u8 *buf;
	int device_type;

	if (product == MOSCHIP_DEVICE_ID_7810 ||
		product == MOSCHIP_DEVICE_ID_7820) {
		device_type = product;
		goto out;
	}

	buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
			MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
			VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);

	/* For a MCS7840 device GPIO0 must be set to 1 */
	if (buf[0] & 0x01)
		device_type = MOSCHIP_DEVICE_ID_7840;
	else if (mos7810_check(serial))
		device_type = MOSCHIP_DEVICE_ID_7810;
	else
		device_type = MOSCHIP_DEVICE_ID_7820;

	kfree(buf);
out:
	usb_set_serial_data(serial, (void *)(unsigned long)device_type);

	return 0;
}

static int mos7840_calc_num_ports(struct usb_serial *serial)
{
	int device_type = (unsigned long)usb_get_serial_data(serial);
	int mos7840_num_ports;

	mos7840_num_ports = (device_type >> 4) & 0x000F;

	return mos7840_num_ports;
}

static int mos7840_attach(struct usb_serial *serial)
{
	if (serial->num_bulk_in < serial->num_ports ||
			serial->num_bulk_out < serial->num_ports ||
			serial->num_interrupt_in < 1) {
		dev_err(&serial->interface->dev, "missing endpoints\n");
		return -ENODEV;
	}

	return 0;
}

static int mos7840_port_probe(struct usb_serial_port *port)
{
	struct usb_serial *serial = port->serial;
	int device_type = (unsigned long)usb_get_serial_data(serial);
	struct moschip_port *mos7840_port;
	int status;
	int pnum;
	__u16 Data;

	/* we set up the pointers to the endpoints in the mos7840_open *
	 * function, as the structures aren't created yet.             */

	pnum = port->port_number;

	dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
	mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
	if (!mos7840_port)
		return -ENOMEM;

	/* Initialize all port interrupt end point to port 0 int
	 * endpoint. Our device has only one interrupt end point
	 * common to all port */

	mos7840_port->port = port;
	mos7840_set_port_private(port, mos7840_port);
	spin_lock_init(&mos7840_port->pool_lock);

	/* minor is not initialised until later by
	 * usb-serial.c:get_free_serial() and cannot therefore be used
	 * to index device instances */
	mos7840_port->port_num = pnum + 1;
	dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
	dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);

	if (mos7840_port->port_num == 1) {
		mos7840_port->SpRegOffset = 0x0;
		mos7840_port->ControlRegOffset = 0x1;
		mos7840_port->DcrRegOffset = 0x4;
	} else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
		mos7840_port->SpRegOffset = 0x8;
		mos7840_port->ControlRegOffset = 0x9;
		mos7840_port->DcrRegOffset = 0x16;
	} else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
		mos7840_port->SpRegOffset = 0xa;
		mos7840_port->ControlRegOffset = 0xb;
		mos7840_port->DcrRegOffset = 0x19;
	} else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
		mos7840_port->SpRegOffset = 0xa;
		mos7840_port->ControlRegOffset = 0xb;
		mos7840_port->DcrRegOffset = 0x19;
	} else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
		mos7840_port->SpRegOffset = 0xc;
		mos7840_port->ControlRegOffset = 0xd;
		mos7840_port->DcrRegOffset = 0x1c;
	}
	mos7840_dump_serial_port(port, mos7840_port);
	mos7840_set_port_private(port, mos7840_port);

	/* enable rx_disable bit in control register */
	status = mos7840_get_reg_sync(port,
			mos7840_port->ControlRegOffset, &Data);
	if (status < 0) {
		dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
		goto out;
	} else
		dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
	Data |= 0x08;	/* setting driver done bit */
	Data |= 0x04;	/* sp1_bit to have cts change reflect in
			   modem status reg */

	/* Data |= 0x20; //rx_disable bit */
	status = mos7840_set_reg_sync(port,
			mos7840_port->ControlRegOffset, Data);
	if (status < 0) {
		dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
		goto out;
	} else
		dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);

	/* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
	   and 0x24 in DCR3 */
	Data = 0x01;
	status = mos7840_set_reg_sync(port,
			(__u16) (mos7840_port->DcrRegOffset + 0), Data);
	if (status < 0) {
		dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
		goto out;
	} else
		dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);

	Data = 0x05;
	status = mos7840_set_reg_sync(port,
			(__u16) (mos7840_port->DcrRegOffset + 1), Data);
	if (status < 0) {
		dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
		goto out;
	} else
		dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);

	Data = 0x24;
	status = mos7840_set_reg_sync(port,
			(__u16) (mos7840_port->DcrRegOffset + 2), Data);
	if (status < 0) {
		dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
		goto out;
	} else
		dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);

	/* write values in clkstart0x0 and clkmulti 0x20 */
	Data = 0x0;
	status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
	if (status < 0) {
		dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
		goto out;
	} else
		dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);

	Data = 0x20;
	status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
	if (status < 0) {
		dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
		goto error;
	} else
		dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);

	/* write value 0x0 to scratchpad register */
	Data = 0x00;
	status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
	if (status < 0) {
		dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
		goto out;
	} else
		dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);

	/* Zero Length flag register */
	if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
		Data = 0xff;
		status = mos7840_set_reg_sync(port,
				(__u16) (ZLP_REG1 +
					((__u16)mos7840_port->port_num)), Data);
		dev_dbg(&port->dev, "ZLIP offset %x\n",
				(__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
		if (status < 0) {
			dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
			goto out;
		} else
			dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
	} else {
		Data = 0xff;
		status = mos7840_set_reg_sync(port,
				(__u16) (ZLP_REG1 +
					((__u16)mos7840_port->port_num) - 0x1), Data);
		dev_dbg(&port->dev, "ZLIP offset %x\n",
				(__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
		if (status < 0) {
			dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
			goto out;
		} else
			dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);

	}
	mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
	mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
	mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
			GFP_KERNEL);
	if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
			!mos7840_port->dr) {
		status = -ENOMEM;
		goto error;
	}

	mos7840_port->has_led = false;

	/* Initialize LED timers */
	if (device_type == MOSCHIP_DEVICE_ID_7810) {
		mos7840_port->has_led = true;

		mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
		mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
								GFP_KERNEL);
		if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
			status = -ENOMEM;
			goto error;
		}

		setup_timer(&mos7840_port->led_timer1, mos7840_led_off,
			    (unsigned long)mos7840_port);
		mos7840_port->led_timer1.expires =
			jiffies + msecs_to_jiffies(LED_ON_MS);
		setup_timer(&mos7840_port->led_timer2, mos7840_led_flag_off,
			    (unsigned long)mos7840_port);
		mos7840_port->led_timer2.expires =
			jiffies + msecs_to_jiffies(LED_OFF_MS);

		/* Turn off LED */
		mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
	}
out:
	if (pnum == serial->num_ports - 1) {
		/* Zero Length flag enable */
		Data = 0x0f;
		status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
		if (status < 0) {
			dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
			goto error;
		} else
			dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);

		/* setting configuration feature to one */
		usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
				0x03, 0x00, 0x01, 0x00, NULL, 0x00,
				MOS_WDR_TIMEOUT);
	}
	return 0;
error:
	kfree(mos7840_port->led_dr);
	usb_free_urb(mos7840_port->led_urb);
	kfree(mos7840_port->dr);
	kfree(mos7840_port->ctrl_buf);
	usb_free_urb(mos7840_port->control_urb);
	kfree(mos7840_port);

	return status;
}

static int mos7840_port_remove(struct usb_serial_port *port)
{
	struct moschip_port *mos7840_port;

	mos7840_port = mos7840_get_port_private(port);

	if (mos7840_port->has_led) {
		/* Turn off LED */
		mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);

		del_timer_sync(&mos7840_port->led_timer1);
		del_timer_sync(&mos7840_port->led_timer2);

		usb_kill_urb(mos7840_port->led_urb);
		usb_free_urb(mos7840_port->led_urb);
		kfree(mos7840_port->led_dr);
	}
	usb_kill_urb(mos7840_port->control_urb);
	usb_free_urb(mos7840_port->control_urb);
	kfree(mos7840_port->ctrl_buf);
	kfree(mos7840_port->dr);
	kfree(mos7840_port);

	return 0;
}

static struct usb_serial_driver moschip7840_4port_device = {
	.driver = {
		   .owner = THIS_MODULE,
		   .name = "mos7840",
		   },
	.description = DRIVER_DESC,
	.id_table = id_table,
	.num_ports = 4,
	.open = mos7840_open,
	.close = mos7840_close,
	.write = mos7840_write,
	.write_room = mos7840_write_room,
	.chars_in_buffer = mos7840_chars_in_buffer,
	.throttle = mos7840_throttle,
	.unthrottle = mos7840_unthrottle,
	.calc_num_ports = mos7840_calc_num_ports,
	.probe = mos7840_probe,
	.ioctl = mos7840_ioctl,
	.set_termios = mos7840_set_termios,
	.break_ctl = mos7840_break,
	.tiocmget = mos7840_tiocmget,
	.tiocmset = mos7840_tiocmset,
	.tiocmiwait = usb_serial_generic_tiocmiwait,
	.get_icount = usb_serial_generic_get_icount,
	.attach = mos7840_attach,
	.port_probe = mos7840_port_probe,
	.port_remove = mos7840_port_remove,
	.read_bulk_callback = mos7840_bulk_in_callback,
	.read_int_callback = mos7840_interrupt_callback,
};

static struct usb_serial_driver * const serial_drivers[] = {
	&moschip7840_4port_device, NULL
};

module_usb_serial_driver(serial_drivers, id_table);

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