aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/serial/cypress_m8.c
blob: 57b8e27285fc007dda4805d0447d51fb0096e43a (plain) (blame)
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
/*
 * USB Cypress M8 driver
 *
 * 	Copyright (C) 2004
 * 	    Lonnie Mendez (dignome@gmail.com) 
 *	Copyright (C) 2003,2004
 *	    Neil Whelchel (koyama@firstlight.net)
 *
 * 	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.
 *
 * See Documentation/usb/usb-serial.txt for more information on using this driver
 *
 * See http://geocities.com/i0xox0i for information on this driver and the
 * earthmate usb device.
 *
 *  Lonnie Mendez <dignome@gmail.com>
 *  4-29-2005
 *	Fixed problem where setting or retreiving the serial config would fail with
 * 	EPIPE.  Removed CRTS toggling so the driver behaves more like other usbserial
 * 	adapters.  Issued new interval of 1ms instead of the default 10ms.  As a
 * 	result, transfer speed has been substantially increased.  From avg. 850bps to
 * 	avg. 3300bps.  initial termios has also been modified.  Cleaned up code and
 * 	formatting issues so it is more readable.  Replaced the C++ style comments.
 *
 *  Lonnie Mendez <dignome@gmail.com>
 *  12-15-2004
 *	Incorporated write buffering from pl2303 driver.  Fixed bug with line
 *	handling so both lines are raised in cypress_open. (was dropping rts)
 *      Various code cleanups made as well along with other misc bug fixes.
 *
 *  Lonnie Mendez <dignome@gmail.com>
 *  04-10-2004
 *	Driver modified to support dynamic line settings.  Various improvments
 *      and features.
 *
 *  Neil Whelchel
 *  10-2003
 *	Driver first released.
 *
 */

/* Thanks to Neil Whelchel for writing the first cypress m8 implementation for linux. */
/* Thanks to cypress for providing references for the hid reports. */
/* Thanks to Jiang Zhang for providing links and for general help. */
/* Code originates and was built up from ftdi_sio, belkin, pl2303 and others. */


#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.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/moduleparam.h>
#include <linux/spinlock.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/serial.h>
#include <linux/delay.h>
#include <asm/uaccess.h>

#include "cypress_m8.h"


#ifdef CONFIG_USB_SERIAL_DEBUG
	static int debug = 1;
#else
	static int debug;
#endif
static int stats;
static int interval;

/*
 * Version Information
 */
#define DRIVER_VERSION "v1.09"
#define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
#define DRIVER_DESC "Cypress USB to Serial Driver"

/* write buffer size defines */
#define CYPRESS_BUF_SIZE	1024
#define CYPRESS_CLOSING_WAIT	(30*HZ)

static struct usb_device_id id_table_earthmate [] = {
	{ USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
	{ USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
	{ }						/* Terminating entry */
};

static struct usb_device_id id_table_cyphidcomrs232 [] = {
	{ USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
	{ }						/* Terminating entry */
};

static struct usb_device_id id_table_nokiaca42v2 [] = {
	{ USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
	{ }						/* Terminating entry */
};

static struct usb_device_id id_table_combined [] = {
	{ USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
	{ USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
	{ USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
	{ USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
	{ }						/* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, id_table_combined);

static struct usb_driver cypress_driver = {
	.name =		"cypress",
	.probe =	usb_serial_probe,
	.disconnect =	usb_serial_disconnect,
	.id_table =	id_table_combined,
	.no_dynamic_id = 	1,
};

struct cypress_private {
	spinlock_t lock;		   /* private lock */
	int chiptype;			   /* identifier of device, for quirks/etc */
	int bytes_in;			   /* used for statistics */
	int bytes_out;			   /* used for statistics */
	int cmd_count;			   /* used for statistics */
	int cmd_ctrl;			   /* always set this to 1 before issuing a command */
	struct cypress_buf *buf;	   /* write buffer */
	int write_urb_in_use;		   /* write urb in use indicator */
	int write_urb_interval;            /* interval to use for write urb */
	int read_urb_interval;             /* interval to use for read urb */
	int comm_is_ok;                    /* true if communication is (still) ok */
	int termios_initialized;
	__u8 line_control;	   	   /* holds dtr / rts value */
	__u8 current_status;	   	   /* received from last read - info on dsr,cts,cd,ri,etc */
	__u8 current_config;	   	   /* stores the current configuration byte */
	__u8 rx_flags;			   /* throttling - used from whiteheat/ftdi_sio */
	int baud_rate;			   /* stores current baud rate in integer form */
	int cbr_mask;			   /* stores current baud rate in masked form */
	int isthrottled;		   /* if throttled, discard reads */
	wait_queue_head_t delta_msr_wait;  /* used for TIOCMIWAIT */
	char prev_status, diff_status;	   /* used for TIOCMIWAIT */
	/* we pass a pointer to this as the arguement sent to cypress_set_termios old_termios */
	struct ktermios tmp_termios; 	   /* stores the old termios settings */
};

/* write buffer structure */
struct cypress_buf {
	unsigned int	buf_size;
	char		*buf_buf;
	char		*buf_get;
	char		*buf_put;
};

/* function prototypes for the Cypress USB to serial device */
static int  cypress_earthmate_startup	(struct usb_serial *serial);
static int  cypress_hidcom_startup	(struct usb_serial *serial);
static int  cypress_ca42v2_startup	(struct usb_serial *serial);
static void cypress_shutdown		(struct usb_serial *serial);
static int  cypress_open		(struct usb_serial_port *port, struct file *filp);
static void cypress_close		(struct usb_serial_port *port, struct file *filp);
static int  cypress_write		(struct usb_serial_port *port, const unsigned char *buf, int count);
static void cypress_send		(struct usb_serial_port *port);
static int  cypress_write_room		(struct usb_serial_port *port);
static int  cypress_ioctl		(struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
static void cypress_set_termios		(struct usb_serial_port *port, struct ktermios * old);
static int  cypress_tiocmget		(struct usb_serial_port *port, struct file *file);
static int  cypress_tiocmset		(struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
static int  cypress_chars_in_buffer	(struct usb_serial_port *port);
static void cypress_throttle		(struct usb_serial_port *port);
static void cypress_unthrottle		(struct usb_serial_port *port);
static void cypress_set_dead		(struct usb_serial_port *port);
static void cypress_read_int_callback	(struct urb *urb);
static void cypress_write_int_callback	(struct urb *urb);
/* baud helper functions */
static int	 mask_to_rate		(unsigned mask);
static unsigned  rate_to_mask		(int rate);
/* write buffer functions */
static struct cypress_buf *cypress_buf_alloc(unsigned int size);
static void 		  cypress_buf_free(struct cypress_buf *cb);
static void		  cypress_buf_clear(struct cypress_buf *cb);
static unsigned int	  cypress_buf_data_avail(struct cypress_buf *cb);
static unsigned int	  cypress_buf_space_avail(struct cypress_buf *cb);
static unsigned int	  cypress_buf_put(struct cypress_buf *cb, const char *buf, unsigned int count);
static unsigned int	  cypress_buf_get(struct cypress_buf *cb, char *buf, unsigned int count);


static struct usb_serial_driver cypress_earthmate_device = {
	.driver = {
		.owner =		THIS_MODULE,
		.name =			"earthmate",
	},
	.description =			"DeLorme Earthmate USB",
	.usb_driver = 			&cypress_driver,
	.id_table =			id_table_earthmate,
	.num_interrupt_in = 		1,
	.num_interrupt_out =		1,
	.num_bulk_in =			NUM_DONT_CARE,
	.num_bulk_out =			NUM_DONT_CARE,
	.num_ports =			1,
	.attach =			cypress_earthmate_startup,
	.shutdown =			cypress_shutdown,
	.open =				cypress_open,
	.close =			cypress_close,
	.write =			cypress_write,
	.write_room =			cypress_write_room,
	.ioctl =			cypress_ioctl,
	.set_termios =			cypress_set_termios,
	.tiocmget =			cypress_tiocmget,
	.tiocmset =			cypress_tiocmset,
	.chars_in_buffer =		cypress_chars_in_buffer,
	.throttle =		 	cypress_throttle,
	.unthrottle =			cypress_unthrottle,
	.read_int_callback =		cypress_read_int_callback,
	.write_int_callback =		cypress_write_int_callback,
};

static struct usb_serial_driver cypress_hidcom_device = {
	.driver = {
		.owner =		THIS_MODULE,
		.name =			"cyphidcom",
	},
	.description =			"HID->COM RS232 Adapter",
	.usb_driver = 			&cypress_driver,
	.id_table =			id_table_cyphidcomrs232,
	.num_interrupt_in =		1,
	.num_interrupt_out =		1,
	.num_bulk_in =			NUM_DONT_CARE,
	.num_bulk_out =			NUM_DONT_CARE,
	.num_ports =			1,
	.attach =			cypress_hidcom_startup,
	.shutdown =			cypress_shutdown,
	.open =				cypress_open,
	.close =			cypress_close,
	.write =			cypress_write,
	.write_room =			cypress_write_room,
	.ioctl =			cypress_ioctl,
	.set_termios =			cypress_set_termios,
	.tiocmget =			cypress_tiocmget,
	.tiocmset =			cypress_tiocmset,
	.chars_in_buffer =		cypress_chars_in_buffer,
	.throttle =			cypress_throttle,
	.unthrottle =			cypress_unthrottle,
	.read_int_callback =		cypress_read_int_callback,
	.write_int_callback =		cypress_write_int_callback,
};

static struct usb_serial_driver cypress_ca42v2_device = {
	.driver = {
		.owner =		THIS_MODULE,
                .name =			"nokiaca42v2",
	},
	.description =			"Nokia CA-42 V2 Adapter",
	.usb_driver = 			&cypress_driver,
	.id_table =			id_table_nokiaca42v2,
	.num_interrupt_in =		1,
	.num_interrupt_out =		1,
	.num_bulk_in =			NUM_DONT_CARE,
	.num_bulk_out =			NUM_DONT_CARE,
	.num_ports =			1,
	.attach =			cypress_ca42v2_startup,
	.shutdown =			cypress_shutdown,
	.open =				cypress_open,
	.close =			cypress_close,
	.write =			cypress_write,
	.write_room =			cypress_write_room,
	.ioctl =			cypress_ioctl,
	.set_termios =			cypress_set_termios,
	.tiocmget =			cypress_tiocmget,
	.tiocmset =			cypress_tiocmset,
	.chars_in_buffer =		cypress_chars_in_buffer,
	.throttle =			cypress_throttle,
	.unthrottle =			cypress_unthrottle,
	.read_int_callback =		cypress_read_int_callback,
	.write_int_callback =		cypress_write_int_callback,
};

/*****************************************************************************
 * Cypress serial helper functions
 *****************************************************************************/


/* This function can either set or retrieve the current serial line settings */
static int cypress_serial_control (struct usb_serial_port *port, unsigned baud_mask, int data_bits, int stop_bits,
				   int parity_enable, int parity_type, int reset, int cypress_request_type)
{
	int new_baudrate = 0, retval = 0, tries = 0;
	struct cypress_private *priv;
	__u8 feature_buffer[8];
	unsigned long flags;

	dbg("%s", __FUNCTION__);
	
	priv = usb_get_serial_port_data(port);

	if (!priv->comm_is_ok)
		return -ENODEV;

	switch(cypress_request_type) {
		case CYPRESS_SET_CONFIG:

			/*
			 * The general purpose firmware for the Cypress M8 allows for a maximum speed
 			 * of 57600bps (I have no idea whether DeLorme chose to use the general purpose
			 * firmware or not), if you need to modify this speed setting for your own
			 * project please add your own chiptype and modify the code likewise.  The
			 * Cypress HID->COM device will work successfully up to 115200bps (but the
			 * actual throughput is around 3kBps).
			 */
			if (baud_mask != priv->cbr_mask) {
				dbg("%s - baud rate is changing", __FUNCTION__);
				if ( priv->chiptype == CT_EARTHMATE ) {
					/* 300 and 600 baud rates are supported under the generic firmware,
					 * but are not used with NMEA and SiRF protocols */
					
					if ( (baud_mask == B300) || (baud_mask == B600) ) {
						err("%s - failed setting baud rate, unsupported speed",
						    __FUNCTION__);
						new_baudrate = priv->baud_rate;
					} else if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
						err("%s - failed setting baud rate, unsupported speed",
						    __FUNCTION__);
						new_baudrate = priv->baud_rate;
					}
				} else if (priv->chiptype == CT_CYPHIDCOM) {
					if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
						err("%s - failed setting baud rate, unsupported speed",
						    __FUNCTION__);
						new_baudrate = priv->baud_rate;
					}
				} else if (priv->chiptype == CT_CA42V2) {
					if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
						err("%s - failed setting baud rate, unsupported speed",
						    __FUNCTION__);
						new_baudrate = priv->baud_rate;
					}
				} else if (priv->chiptype == CT_GENERIC) {
					if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
						err("%s - failed setting baud rate, unsupported speed",
						    __FUNCTION__);
						new_baudrate = priv->baud_rate;
					}
				} else {
					info("%s - please define your chiptype", __FUNCTION__);
					new_baudrate = priv->baud_rate;
				}
			} else {  /* baud rate not changing, keep the old */
				new_baudrate = priv->baud_rate;
			}
			dbg("%s - baud rate is being sent as %d", __FUNCTION__, new_baudrate);
			
			memset(feature_buffer, 0, 8);
			/* fill the feature_buffer with new configuration */
			*((u_int32_t *)feature_buffer) = new_baudrate;

			feature_buffer[4] |= data_bits;   /* assign data bits in 2 bit space ( max 3 ) */
			/* 1 bit gap */
			feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
			feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
			feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
			/* 1 bit gap */
			feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
				
			dbg("%s - device is being sent this feature report:", __FUNCTION__);
			dbg("%s - %02X - %02X - %02X - %02X - %02X", __FUNCTION__, feature_buffer[0], feature_buffer[1],
		            feature_buffer[2], feature_buffer[3], feature_buffer[4]);
			
			do {
			retval = usb_control_msg (port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
					  	  HID_REQ_SET_REPORT, USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
						  	  0x0300, 0, feature_buffer, 8, 500);

				if (tries++ >= 3)
					break;

			} while (retval != 8 && retval != -ENODEV);

			if (retval != 8) {
				err("%s - failed sending serial line settings - %d", __FUNCTION__, retval);
				cypress_set_dead(port);
			} else {
				spin_lock_irqsave(&priv->lock, flags);
				priv->baud_rate = new_baudrate;
				priv->cbr_mask = baud_mask;
				priv->current_config = feature_buffer[4];
				spin_unlock_irqrestore(&priv->lock, flags);
			}
		break;
		case CYPRESS_GET_CONFIG:
			dbg("%s - retreiving serial line settings", __FUNCTION__);
			/* set initial values in feature buffer */
			memset(feature_buffer, 0, 8);

			do {
			retval = usb_control_msg (port->serial->dev, usb_rcvctrlpipe(port->serial->dev, 0),
						  HID_REQ_GET_REPORT, USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
							  0x0300, 0, feature_buffer, 8, 500);
				
				if (tries++ >= 3)
					break;

			} while (retval != 5 && retval != -ENODEV);

			if (retval != 5) {
				err("%s - failed to retrieve serial line settings - %d", __FUNCTION__, retval);
				cypress_set_dead(port);
				return retval;
			} else {
				spin_lock_irqsave(&priv->lock, flags);

				/* store the config in one byte, and later use bit masks to check values */
				priv->current_config = feature_buffer[4];
				priv->baud_rate = *((u_int32_t *)feature_buffer);
				
				if ( (priv->cbr_mask = rate_to_mask(priv->baud_rate)) == 0x40)
					dbg("%s - failed setting the baud mask (not defined)", __FUNCTION__);
				spin_unlock_irqrestore(&priv->lock, flags);
			}
	}
	spin_lock_irqsave(&priv->lock, flags);
	++priv->cmd_count;
	spin_unlock_irqrestore(&priv->lock, flags);

	return retval;
} /* cypress_serial_control */


static void cypress_set_dead(struct usb_serial_port *port)
{
	struct cypress_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	if (!priv->comm_is_ok) {
		spin_unlock_irqrestore(&priv->lock, flags);
		return;
	}
	priv->comm_is_ok = 0;
	spin_unlock_irqrestore(&priv->lock, flags);

	err("cypress_m8 suspending failing port %d - interval might be too short",
	    port->number);
}


/* given a baud mask, it will return integer baud on success */
static int mask_to_rate (unsigned mask)
{
	int rate;

	switch (mask) {
		case B0: rate = 0; break;
		case B300: rate = 300; break;
		case B600: rate = 600; break;
		case B1200: rate = 1200; break;
		case B2400: rate = 2400; break;
		case B4800: rate = 4800; break;
		case B9600: rate = 9600; break;
		case B19200: rate = 19200; break;
		case B38400: rate = 38400; break;
		case B57600: rate = 57600; break;
		case B115200: rate = 115200; break;
		default: rate = -1;
	}

	return rate;
}


static unsigned rate_to_mask (int rate)
{
	unsigned mask;

	switch (rate) {
		case 0: mask = B0; break;
		case 300: mask = B300; break;
		case 600: mask = B600; break;
		case 1200: mask = B1200; break;
		case 2400: mask = B2400; break;
		case 4800: mask = B4800; break;
		case 9600: mask = B9600; break;
		case 19200: mask = B19200; break;
		case 38400: mask = B38400; break;
		case 57600: mask = B57600; break;
		case 115200: mask = B115200; break;
		default: mask = 0x40;
	}

	return mask;
}
/*****************************************************************************
 * Cypress serial driver functions
 *****************************************************************************/


static int generic_startup (struct usb_serial *serial)
{
	struct cypress_private *priv;
	struct usb_serial_port *port = serial->port[0];

	dbg("%s - port %d", __FUNCTION__, port->number);

	priv = kzalloc(sizeof (struct cypress_private), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->comm_is_ok = !0;
	spin_lock_init(&priv->lock);
	priv->buf = cypress_buf_alloc(CYPRESS_BUF_SIZE);
	if (priv->buf == NULL) {
		kfree(priv);
		return -ENOMEM;
	}
	init_waitqueue_head(&priv->delta_msr_wait);
	
	usb_reset_configuration (serial->dev);
	
	priv->cmd_ctrl = 0;
	priv->line_control = 0;
	priv->termios_initialized = 0;
	priv->rx_flags = 0;
	priv->cbr_mask = B300;
	if (interval > 0) {
		priv->write_urb_interval = interval;
		priv->read_urb_interval = interval;
		dbg("%s - port %d read & write intervals forced to %d",
		    __FUNCTION__,port->number,interval);
	} else {
		priv->write_urb_interval = port->interrupt_out_urb->interval;
		priv->read_urb_interval = port->interrupt_in_urb->interval;
		dbg("%s - port %d intervals: read=%d write=%d",
		    __FUNCTION__,port->number,
		    priv->read_urb_interval,priv->write_urb_interval);
	}
	usb_set_serial_port_data(port, priv);
	
	return 0;
}


static int cypress_earthmate_startup (struct usb_serial *serial)
{
	struct cypress_private *priv;

	dbg("%s", __FUNCTION__);

	if (generic_startup(serial)) {
		dbg("%s - Failed setting up port %d", __FUNCTION__,
				serial->port[0]->number);
		return 1;
	}

	priv = usb_get_serial_port_data(serial->port[0]);
	priv->chiptype = CT_EARTHMATE;

	return 0;
} /* cypress_earthmate_startup */


static int cypress_hidcom_startup (struct usb_serial *serial)
{
	struct cypress_private *priv;

	dbg("%s", __FUNCTION__);

	if (generic_startup(serial)) {
		dbg("%s - Failed setting up port %d", __FUNCTION__,
				serial->port[0]->number);
		return 1;
	}

	priv = usb_get_serial_port_data(serial->port[0]);
	priv->chiptype = CT_CYPHIDCOM;
	
	return 0;
} /* cypress_hidcom_startup */


static int cypress_ca42v2_startup (struct usb_serial *serial)
{
	struct cypress_private *priv;

	dbg("%s", __FUNCTION__);

	if (generic_startup(serial)) {
		dbg("%s - Failed setting up port %d", __FUNCTION__,
				serial->port[0]->number);
		return 1;
	}

	priv = usb_get_serial_port_data(serial->port[0]);
	priv->chiptype = CT_CA42V2;

	return 0;
} /* cypress_ca42v2_startup */


static void cypress_shutdown (struct usb_serial *serial)
{
	struct cypress_private *priv;

	dbg ("%s - port %d", __FUNCTION__, serial->port[0]->number);

	/* all open ports are closed at this point */

	priv = usb_get_serial_port_data(serial->port[0]);

	if (priv) {
		cypress_buf_free(priv->buf);
		kfree(priv);
		usb_set_serial_port_data(serial->port[0], NULL);
	}
}


static int cypress_open (struct usb_serial_port *port, struct file *filp)
{
	struct cypress_private *priv = usb_get_serial_port_data(port);
	struct usb_serial *serial = port->serial;
	unsigned long flags;
	int result = 0;

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (!priv->comm_is_ok)
		return -EIO;

	/* clear halts before open */
	usb_clear_halt(serial->dev, 0x81);
	usb_clear_halt(serial->dev, 0x02);

	spin_lock_irqsave(&priv->lock, flags);
	/* reset read/write statistics */
	priv->bytes_in = 0;
	priv->bytes_out = 0;
	priv->cmd_count = 0;
	priv->rx_flags = 0;
	spin_unlock_irqrestore(&priv->lock, flags);

	/* setting to zero could cause data loss */
	port->tty->low_latency = 1;

	/* raise both lines and set termios */
	spin_lock_irqsave(&priv->lock, flags);
	priv->line_control = CONTROL_DTR | CONTROL_RTS;
	priv->cmd_ctrl = 1;
	spin_unlock_irqrestore(&priv->lock, flags);
	result = cypress_write(port, NULL, 0);

	if (result) {
		dev_err(&port->dev, "%s - failed setting the control lines - error %d\n", __FUNCTION__, result);
		return result;
	} else
		dbg("%s - success setting the control lines", __FUNCTION__);	

	cypress_set_termios(port, &priv->tmp_termios);

	/* setup the port and start reading from the device */
	if(!port->interrupt_in_urb){
		err("%s - interrupt_in_urb is empty!", __FUNCTION__);
		return(-1);
	}

	usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
		usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
		port->interrupt_in_urb->transfer_buffer, port->interrupt_in_urb->transfer_buffer_length,
		cypress_read_int_callback, port, priv->read_urb_interval);
	result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);

	if (result){
		dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
		cypress_set_dead(port);
	}

	return result;
} /* cypress_open */


static void cypress_close(struct usb_serial_port *port, struct file * filp)
{
	struct cypress_private *priv = usb_get_serial_port_data(port);
	unsigned int c_cflag;
	unsigned long flags;
	int bps;
	long timeout;
	wait_queue_t wait;

	dbg("%s - port %d", __FUNCTION__, port->number);

	/* wait for data to drain from buffer */
	spin_lock_irqsave(&priv->lock, flags);
	timeout = CYPRESS_CLOSING_WAIT;
	init_waitqueue_entry(&wait, current);
	add_wait_queue(&port->tty->write_wait, &wait);
	for (;;) {
		set_current_state(TASK_INTERRUPTIBLE);
		if (cypress_buf_data_avail(priv->buf) == 0
		|| timeout == 0 || signal_pending(current)
		|| !usb_get_intfdata(port->serial->interface))
			break;
		spin_unlock_irqrestore(&priv->lock, flags);
		timeout = schedule_timeout(timeout);
		spin_lock_irqsave(&priv->lock, flags);
	}
	set_current_state(TASK_RUNNING);
	remove_wait_queue(&port->tty->write_wait, &wait);
	/* clear out any remaining data in the buffer */
	cypress_buf_clear(priv->buf);
	spin_unlock_irqrestore(&priv->lock, flags);
	
	/* wait for characters to drain from device */
	bps = tty_get_baud_rate(port->tty);
	if (bps > 1200)
		timeout = max((HZ*2560)/bps,HZ/10);
	else
		timeout = 2*HZ;
	schedule_timeout_interruptible(timeout);

	dbg("%s - stopping urbs", __FUNCTION__);
	usb_kill_urb (port->interrupt_in_urb);
	usb_kill_urb (port->interrupt_out_urb);

	if (port->tty) {
		c_cflag = port->tty->termios->c_cflag;
		if (c_cflag & HUPCL) {
			/* drop dtr and rts */
			priv = usb_get_serial_port_data(port);
			spin_lock_irqsave(&priv->lock, flags);
			priv->line_control = 0;
			priv->cmd_ctrl = 1;
			spin_unlock_irqrestore(&priv->lock, flags);
			cypress_write(port, NULL, 0);
		}
	}

	if (stats)
		dev_info (&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
		          priv->bytes_in, priv->bytes_out, priv->cmd_count);
} /* cypress_close */


static int cypress_write(struct usb_serial_port *port, const unsigned char *buf, int count)
{
	struct cypress_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	
	dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);

	/* line control commands, which need to be executed immediately,
	   are not put into the buffer for obvious reasons.
	 */
	if (priv->cmd_ctrl) {
		count = 0;
		goto finish;
	}
	
	if (!count)
		return count;
	
	spin_lock_irqsave(&priv->lock, flags);
	count = cypress_buf_put(priv->buf, buf, count);
	spin_unlock_irqrestore(&priv->lock, flags);

finish:
	cypress_send(port);

	return count;
} /* cypress_write */


static void cypress_send(struct usb_serial_port *port)
{
	int count = 0, result, offset, actual_size;
	struct cypress_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	
	if (!priv->comm_is_ok)
		return;

	dbg("%s - port %d", __FUNCTION__, port->number);
	dbg("%s - interrupt out size is %d", __FUNCTION__, port->interrupt_out_size);
	
	spin_lock_irqsave(&priv->lock, flags);
	if (priv->write_urb_in_use) {
		dbg("%s - can't write, urb in use", __FUNCTION__);
		spin_unlock_irqrestore(&priv->lock, flags);
		return;
	}
	spin_unlock_irqrestore(&priv->lock, flags);

	/* clear buffer */
	memset(port->interrupt_out_urb->transfer_buffer, 0, port->interrupt_out_size);

	spin_lock_irqsave(&priv->lock, flags);
	switch (port->interrupt_out_size) {
		case 32:
			/* this is for the CY7C64013... */
			offset = 2;
			port->interrupt_out_buffer[0] = priv->line_control;
			break;
		case 8:
			/* this is for the CY7C63743... */
			offset = 1;
			port->interrupt_out_buffer[0] = priv->line_control;
			break;
		default:
			dbg("%s - wrong packet size", __FUNCTION__);
			spin_unlock_irqrestore(&priv->lock, flags);
			return;
	}

	if (priv->line_control & CONTROL_RESET)
		priv->line_control &= ~CONTROL_RESET;

	if (priv->cmd_ctrl) {
		priv->cmd_count++;
		dbg("%s - line control command being issued", __FUNCTION__);
		spin_unlock_irqrestore(&priv->lock, flags);
		goto send;
	} else
		spin_unlock_irqrestore(&priv->lock, flags);

	count = cypress_buf_get(priv->buf, &port->interrupt_out_buffer[offset],
				port->interrupt_out_size-offset);

	if (count == 0) {
		return;
	}

	switch (port->interrupt_out_size) {
		case 32:
			port->interrupt_out_buffer[1] = count;
			break;
		case 8:
			port->interrupt_out_buffer[0] |= count;
	}

	dbg("%s - count is %d", __FUNCTION__, count);

send:
	spin_lock_irqsave(&priv->lock, flags);
	priv->write_urb_in_use = 1;
	spin_unlock_irqrestore(&priv->lock, flags);

	if (priv->cmd_ctrl)
		actual_size = 1;
	else
		actual_size = count + (port->interrupt_out_size == 32 ? 2 : 1);
	
	usb_serial_debug_data(debug, &port->dev, __FUNCTION__, port->interrupt_out_size,
			      port->interrupt_out_urb->transfer_buffer);

	usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
		usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
		port->interrupt_out_buffer, port->interrupt_out_size,
		cypress_write_int_callback, port, priv->write_urb_interval);
	result = usb_submit_urb (port->interrupt_out_urb, GFP_ATOMIC);
	if (result) {
		dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__,
			result);
		priv->write_urb_in_use = 0;
		cypress_set_dead(port);
	}

	spin_lock_irqsave(&priv->lock, flags);
	if (priv->cmd_ctrl) {
		priv->cmd_ctrl = 0;
	}
	priv->bytes_out += count; /* do not count the line control and size bytes */
	spin_unlock_irqrestore(&priv->lock, flags);

	usb_serial_port_softint(port);
} /* cypress_send */


/* returns how much space is available in the soft buffer */
static int cypress_write_room(struct usb_serial_port *port)
{
	struct cypress_private *priv = usb_get_serial_port_data(port);
	int room = 0;
	unsigned long flags;

	dbg("%s - port %d", __FUNCTION__, port->number);

	spin_lock_irqsave(&priv->lock, flags);
	room = cypress_buf_space_avail(priv->buf);
	spin_unlock_irqrestore(&priv->lock, flags);

	dbg("%s - returns %d", __FUNCTION__, room);
	return room;
}


static int cypress_tiocmget (struct usb_serial_port *port, struct file *file)
{
	struct cypress_private *priv = usb_get_serial_port_data(port);
	__u8 status, control;
	unsigned int result = 0;
	unsigned long flags;
	
	dbg("%s - port %d", __FUNCTION__, port->number);

	spin_lock_irqsave(&priv->lock, flags);
	control = priv->line_control;
	status = priv->current_status;
	spin_unlock_irqrestore(&priv->lock, flags);

	result = ((control & CONTROL_DTR)        ? TIOCM_DTR : 0)
		| ((control & CONTROL_RTS)       ? TIOCM_RTS : 0)
		| ((status & UART_CTS)        ? TIOCM_CTS : 0)
		| ((status & UART_DSR)        ? TIOCM_DSR : 0)
		| ((status & UART_RI)         ? TIOCM_RI  : 0)
		| ((status & UART_CD)         ? TIOCM_CD  : 0);

	dbg("%s - result = %x", __FUNCTION__, result);

	return result;
}


static int cypress_tiocmset (struct usb_serial_port *port, struct file *file,
			       unsigned int set, unsigned int clear)
{
	struct cypress_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	
	dbg("%s - port %d", __FUNCTION__, port->number);

	spin_lock_irqsave(&priv->lock, flags);
	if (set & TIOCM_RTS)
		priv->line_control |= CONTROL_RTS;
	if (set & TIOCM_DTR)
		priv->line_control |= CONTROL_DTR;
	if (clear & TIOCM_RTS)
		priv->line_control &= ~CONTROL_RTS;
	if (clear & TIOCM_DTR)
		priv->line_control &= ~CONTROL_DTR;
	spin_unlock_irqrestore(&priv->lock, flags);

	priv->cmd_ctrl = 1;
	return cypress_write(port, NULL, 0);
}


static int cypress_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
{
	struct cypress_private *priv = usb_get_serial_port_data(port);

	dbg("%s - port %d, cmd 0x%.4x", __FUNCTION__, port->number, cmd);

	switch (cmd) {
		case TIOCGSERIAL:
			if (copy_to_user((void __user *)arg, port->tty->termios, sizeof(struct ktermios))) {
				return -EFAULT;
			}
			return (0);
			break;
		case TIOCSSERIAL:
			if (copy_from_user(port->tty->termios, (void __user *)arg, sizeof(struct ktermios))) {
				return -EFAULT;
			}
			/* here we need to call cypress_set_termios to invoke the new settings */
			cypress_set_termios(port, &priv->tmp_termios);
			return (0);
			break;
		/* This code comes from drivers/char/serial.c and ftdi_sio.c */
		case TIOCMIWAIT:
			while (priv != NULL) {
				interruptible_sleep_on(&priv->delta_msr_wait);
				/* see if a signal did it */
				if (signal_pending(current))
					return -ERESTARTSYS;
				else {
					char diff = priv->diff_status;

					if (diff == 0) {
						return -EIO; /* no change => error */
					}
					
					/* consume all events */
					priv->diff_status = 0;

					/* return 0 if caller wanted to know about these bits */
					if ( ((arg & TIOCM_RNG) && (diff & UART_RI)) ||
					     ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
					     ((arg & TIOCM_CD) && (diff & UART_CD)) ||
					     ((arg & TIOCM_CTS) && (diff & UART_CTS)) ) {
						return 0;
					}
					/* otherwise caller can't care less about what happened,
					 * and so we continue to wait for more events.
					 */
				}
			}
			return 0;
			break;
		default:
			break;
	}

	dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __FUNCTION__, cmd);

	return -ENOIOCTLCMD;
} /* cypress_ioctl */


static void cypress_set_termios (struct usb_serial_port *port,
		struct ktermios *old_termios)
{
	struct cypress_private *priv = usb_get_serial_port_data(port);
	struct tty_struct *tty;
	int data_bits, stop_bits, parity_type, parity_enable;
	unsigned cflag, iflag, baud_mask;
	unsigned long flags;
	__u8 oldlines;
	int linechange = 0;

	dbg("%s - port %d", __FUNCTION__, port->number);

	tty = port->tty;
	if ((!tty) || (!tty->termios)) {
		dbg("%s - no tty structures", __FUNCTION__);
		return;
	}

	spin_lock_irqsave(&priv->lock, flags);
	if (!priv->termios_initialized) {
		if (priv->chiptype == CT_EARTHMATE) {
			*(tty->termios) = tty_std_termios;
			tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL |
				CLOCAL;
		} else if (priv->chiptype == CT_CYPHIDCOM) {
			*(tty->termios) = tty_std_termios;
			tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
				CLOCAL;
		} else if (priv->chiptype == CT_CA42V2) {
			*(tty->termios) = tty_std_termios;
			tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
				CLOCAL;
		}
		priv->termios_initialized = 1;
	}
	spin_unlock_irqrestore(&priv->lock, flags);

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

	/* check if there are new settings */
	if (old_termios) {
		if ((cflag != old_termios->c_cflag) ||
			(RELEVANT_IFLAG(iflag) !=
			 RELEVANT_IFLAG(old_termios->c_iflag))) {
			dbg("%s - attempting to set new termios settings",
					__FUNCTION__);
			/* should make a copy of this in case something goes
			 * wrong in the function, we can restore it */
			spin_lock_irqsave(&priv->lock, flags);
			priv->tmp_termios = *(tty->termios);
			spin_unlock_irqrestore(&priv->lock, flags);
		} else {
			dbg("%s - nothing to do, exiting", __FUNCTION__);
			return;
		}
	} else
		return;

	/* set number of data bits, parity, stop bits */
	/* when parity is disabled the parity type bit is ignored */

	/* 1 means 2 stop bits, 0 means 1 stop bit */
	stop_bits = cflag & CSTOPB ? 1 : 0;

	if (cflag & PARENB) {
		parity_enable = 1;
		/* 1 means odd parity, 0 means even parity */
		parity_type = cflag & PARODD ? 1 : 0;
	} else
		parity_enable = parity_type = 0;

	if (cflag & CSIZE) {
		switch (cflag & CSIZE) {
			case CS5:
				data_bits = 0;
				break;
			case CS6:
				data_bits = 1;
				break;
			case CS7:
				data_bits = 2;
				break;
			case CS8:
				data_bits = 3;
				break;
			default:
				err("%s - CSIZE was set, but not CS5-CS8",
						__FUNCTION__);
				data_bits = 3;
		}
	} else
		data_bits = 3;

	spin_lock_irqsave(&priv->lock, flags);
	oldlines = priv->line_control;
	if ((cflag & CBAUD) == B0) {
		/* drop dtr and rts */
		dbg("%s - dropping the lines, baud rate 0bps", __FUNCTION__);
		baud_mask = B0;
		priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
	} else {
		baud_mask = (cflag & CBAUD);
		switch(baud_mask) {
			case B300:
				dbg("%s - setting baud 300bps", __FUNCTION__);
				break;
			case B600:
				dbg("%s - setting baud 600bps", __FUNCTION__);
				break;
			case B1200:
				dbg("%s - setting baud 1200bps", __FUNCTION__);
				break;
			case B2400:
				dbg("%s - setting baud 2400bps", __FUNCTION__);
				break;
			case B4800:
				dbg("%s - setting baud 4800bps", __FUNCTION__);
				break;
			case B9600:
				dbg("%s - setting baud 9600bps", __FUNCTION__);
				break;
			case B19200:
				dbg("%s - setting baud 19200bps", __FUNCTION__);
				break;
			case B38400:
				dbg("%s - setting baud 38400bps", __FUNCTION__);
				break;
			case B57600:
				dbg("%s - setting baud 57600bps", __FUNCTION__);
				break;
			case B115200:
				dbg("%s - setting baud 115200bps", __FUNCTION__);
				break;
			default:
				dbg("%s - unknown masked baud rate", __FUNCTION__);
		}
		priv->line_control = (CONTROL_DTR | CONTROL_RTS);
	}
	spin_unlock_irqrestore(&priv->lock, flags);

	dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
			"%d data_bits (+5)", __FUNCTION__, stop_bits,
			parity_enable, parity_type, data_bits);

	cypress_serial_control(port, baud_mask, data_bits, stop_bits,
			parity_enable, parity_type, 0, CYPRESS_SET_CONFIG);

	/* we perform a CYPRESS_GET_CONFIG so that the current settings are
	 * filled into the private structure this should confirm that all is
	 * working if it returns what we just set */
	cypress_serial_control(port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);

	/* Here we can define custom tty settings for devices; the main tty
	 * termios flag base comes from empeg.c */

	spin_lock_irqsave(&priv->lock, flags);
	if ( (priv->chiptype == CT_EARTHMATE) && (priv->baud_rate == 4800) ) {
		dbg("Using custom termios settings for a baud rate of "
				"4800bps.");
		/* define custom termios settings for NMEA protocol */

		tty->termios->c_iflag /* input modes - */
			&= ~(IGNBRK  /* disable ignore break */
			| BRKINT     /* disable break causes interrupt */
			| PARMRK     /* disable mark parity errors */
			| ISTRIP     /* disable clear high bit of input char */
			| INLCR      /* disable translate NL to CR */
			| IGNCR      /* disable ignore CR */
			| ICRNL      /* disable translate CR to NL */
			| IXON);     /* disable enable XON/XOFF flow control */

		tty->termios->c_oflag /* output modes */
			&= ~OPOST;    /* disable postprocess output char */

		tty->termios->c_lflag /* line discipline modes */
			&= ~(ECHO     /* disable echo input characters */
			| ECHONL      /* disable echo new line */
			| ICANON      /* disable erase, kill, werase, and rprnt
					 special characters */
			| ISIG        /* disable interrupt, quit, and suspend
					 special characters */
			| IEXTEN);    /* disable non-POSIX special characters */
	} /* CT_CYPHIDCOM: Application should handle this for device */

	linechange = (priv->line_control != oldlines);
	spin_unlock_irqrestore(&priv->lock, flags);

	/* if necessary, set lines */
	if (linechange) {
		priv->cmd_ctrl = 1;
		cypress_write(port, NULL, 0);
	}
} /* cypress_set_termios */


/* returns amount of data still left in soft buffer */
static int cypress_chars_in_buffer(struct usb_serial_port *port)
{
	struct cypress_private *priv = usb_get_serial_port_data(port);
	int chars = 0;
	unsigned long flags;

	dbg("%s - port %d", __FUNCTION__, port->number);
	
	spin_lock_irqsave(&priv->lock, flags);
	chars = cypress_buf_data_avail(priv->buf);
	spin_unlock_irqrestore(&priv->lock, flags);

	dbg("%s - returns %d", __FUNCTION__, chars);
	return chars;
}


static void cypress_throttle (struct usb_serial_port *port)
{
	struct cypress_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;

	dbg("%s - port %d", __FUNCTION__, port->number);

	spin_lock_irqsave(&priv->lock, flags);
	priv->rx_flags = THROTTLED;
	spin_unlock_irqrestore(&priv->lock, flags);
}


static void cypress_unthrottle (struct usb_serial_port *port)
{
	struct cypress_private *priv = usb_get_serial_port_data(port);
	int actually_throttled, result;
	unsigned long flags;

	dbg("%s - port %d", __FUNCTION__, port->number);

	spin_lock_irqsave(&priv->lock, flags);
	actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
	priv->rx_flags = 0;
	spin_unlock_irqrestore(&priv->lock, flags);

	if (!priv->comm_is_ok)
		return;

	if (actually_throttled) {
		port->interrupt_in_urb->dev = port->serial->dev;

		result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
		if (result) {
			dev_err(&port->dev, "%s - failed submitting read urb, "
					"error %d\n", __FUNCTION__, result);
			cypress_set_dead(port);
		}
	}
}


static void cypress_read_int_callback(struct urb *urb)
{
	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
	struct cypress_private *priv = usb_get_serial_port_data(port);
	struct tty_struct *tty;
	unsigned char *data = urb->transfer_buffer;
	unsigned long flags;
	char tty_flag = TTY_NORMAL;
	int havedata = 0;
	int bytes = 0;
	int result;
	int i = 0;

	dbg("%s - port %d", __FUNCTION__, port->number);

	switch (urb->status) {
	case 0: /* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* precursor to disconnect so just go away */
		return;
	case -EPIPE:
		usb_clear_halt(port->serial->dev,0x81);
		break;
	default:
		/* something ugly is going on... */
		dev_err(&urb->dev->dev,"%s - unexpected nonzero read status received: %d\n",
			__FUNCTION__,urb->status);
		cypress_set_dead(port);
		return;
	}

	spin_lock_irqsave(&priv->lock, flags);
	if (priv->rx_flags & THROTTLED) {
		dbg("%s - now throttling", __FUNCTION__);
		priv->rx_flags |= ACTUALLY_THROTTLED;
		spin_unlock_irqrestore(&priv->lock, flags);
		return;
	}
	spin_unlock_irqrestore(&priv->lock, flags);

	tty = port->tty;
	if (!tty) {
		dbg("%s - bad tty pointer - exiting", __FUNCTION__);
		return;
	}

	spin_lock_irqsave(&priv->lock, flags);
	switch(urb->actual_length) {
		case 32:
			/* This is for the CY7C64013... */
			priv->current_status = data[0] & 0xF8;
			bytes = data[1] + 2;
			i = 2;
			if (bytes > 2)
				havedata = 1;
			break;
		case 8:
			/* This is for the CY7C63743... */
			priv->current_status = data[0] & 0xF8;
			bytes = (data[0] & 0x07) + 1;
			i = 1;
			if (bytes > 1)
				havedata = 1;
			break;
		default:
			dbg("%s - wrong packet size - received %d bytes",
					__FUNCTION__, urb->actual_length);
			spin_unlock_irqrestore(&priv->lock, flags);
			goto continue_read;
	}
	spin_unlock_irqrestore(&priv->lock, flags);

	usb_serial_debug_data (debug, &port->dev, __FUNCTION__,
			urb->actual_length, data);

	spin_lock_irqsave(&priv->lock, flags);
	/* check to see if status has changed */
	if (priv != NULL) {
		if (priv->current_status != priv->prev_status) {
			priv->diff_status |= priv->current_status ^
				priv->prev_status;
			wake_up_interruptible(&priv->delta_msr_wait);
			priv->prev_status = priv->current_status;
		}
	}
	spin_unlock_irqrestore(&priv->lock, flags);

	/* hangup, as defined in acm.c... this might be a bad place for it
	 * though */
	if (tty && !(tty->termios->c_cflag & CLOCAL) &&
			!(priv->current_status & UART_CD)) {
		dbg("%s - calling hangup", __FUNCTION__);
		tty_hangup(tty);
		goto continue_read;
	}

	/* There is one error bit... I'm assuming it is a parity error
	 * indicator as the generic firmware will set this bit to 1 if a
	 * parity error occurs.
	 * I can not find reference to any other error events. */
	spin_lock_irqsave(&priv->lock, flags);
	if (priv->current_status & CYP_ERROR) {
		spin_unlock_irqrestore(&priv->lock, flags);
		tty_flag = TTY_PARITY;
		dbg("%s - Parity Error detected", __FUNCTION__);
	} else
		spin_unlock_irqrestore(&priv->lock, flags);

	/* process read if there is data other than line status */
	if (tty && (bytes > i)) {
		bytes = tty_buffer_request_room(tty, bytes);
		for (; i < bytes ; ++i) {
			dbg("pushing byte number %d - %d - %c", i, data[i],
					data[i]);
			tty_insert_flip_char(tty, data[i], tty_flag);
		}
		tty_flip_buffer_push(port->tty);
	}

	spin_lock_irqsave(&priv->lock, flags);
	/* control and status byte(s) are also counted */
	priv->bytes_in += bytes;
	spin_unlock_irqrestore(&priv->lock, flags);

continue_read:

	/* Continue trying to always read... unless the port has closed. */

	if (port->open_count > 0 && priv->comm_is_ok) {
		usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
				usb_rcvintpipe(port->serial->dev,
					port->interrupt_in_endpointAddress),
				port->interrupt_in_urb->transfer_buffer,
				port->interrupt_in_urb->transfer_buffer_length,
				cypress_read_int_callback, port, priv->read_urb_interval);
		result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
		if (result) {
			dev_err(&urb->dev->dev, "%s - failed resubmitting "
					"read urb, error %d\n", __FUNCTION__,
					result);
			cypress_set_dead(port);
		}
	}

	return;
} /* cypress_read_int_callback */


static void cypress_write_int_callback(struct urb *urb)
{
	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
	struct cypress_private *priv = usb_get_serial_port_data(port);
	int result;

	dbg("%s - port %d", __FUNCTION__, port->number);
	
	switch (urb->status) {
		case 0:
			/* success */
			break;
		case -ECONNRESET:
		case -ENOENT:
		case -ESHUTDOWN:
			/* this urb is terminated, clean up */
			dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
			priv->write_urb_in_use = 0;
			return;
		case -EPIPE: /* no break needed; clear halt and resubmit */
			if (!priv->comm_is_ok)
				break;
			usb_clear_halt(port->serial->dev, 0x02);
			/* error in the urb, so we have to resubmit it */
			dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
			port->interrupt_out_urb->transfer_buffer_length = 1;
			port->interrupt_out_urb->dev = port->serial->dev;
			result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
			if (!result)
				return;
			dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n",
				__FUNCTION__, result);
			cypress_set_dead(port);
			break;
		default:
			dev_err(&urb->dev->dev,"%s - unexpected nonzero write status received: %d\n",
				__FUNCTION__,urb->status);
			cypress_set_dead(port);
			break;
	}
	
	priv->write_urb_in_use = 0;
	
	/* send any buffered data */
	cypress_send(port);
}


/*****************************************************************************
 * Write buffer functions - buffering code from pl2303 used
 *****************************************************************************/

/*
 * cypress_buf_alloc
 *
 * Allocate a circular buffer and all associated memory.
 */

static struct cypress_buf *cypress_buf_alloc(unsigned int size)
{

	struct cypress_buf *cb;


	if (size == 0)
		return NULL;

	cb = kmalloc(sizeof(struct cypress_buf), GFP_KERNEL);
	if (cb == NULL)
		return NULL;

	cb->buf_buf = kmalloc(size, GFP_KERNEL);
	if (cb->buf_buf == NULL) {
		kfree(cb);
		return NULL;
	}

	cb->buf_size = size;
	cb->buf_get = cb->buf_put = cb->buf_buf;

	return cb;

}


/*
 * cypress_buf_free
 *
 * Free the buffer and all associated memory.
 */

static void cypress_buf_free(struct cypress_buf *cb)
{
	if (cb) {
		kfree(cb->buf_buf);
		kfree(cb);
	}
}


/*
 * cypress_buf_clear
 *
 * Clear out all data in the circular buffer.
 */

static void cypress_buf_clear(struct cypress_buf *cb)
{
	if (cb != NULL)
		cb->buf_get = cb->buf_put;
		/* equivalent to a get of all data available */
}


/*
 * cypress_buf_data_avail
 *
 * Return the number of bytes of data available in the circular
 * buffer.
 */

static unsigned int cypress_buf_data_avail(struct cypress_buf *cb)
{
	if (cb != NULL)
		return ((cb->buf_size + cb->buf_put - cb->buf_get) % cb->buf_size);
	else
		return 0;
}


/*
 * cypress_buf_space_avail
 *
 * Return the number of bytes of space available in the circular
 * buffer.
 */

static unsigned int cypress_buf_space_avail(struct cypress_buf *cb)
{
	if (cb != NULL)
		return ((cb->buf_size + cb->buf_get - cb->buf_put - 1) % cb->buf_size);
	else
		return 0;
}


/*
 * cypress_buf_put
 *
 * Copy data data from a user buffer and put it into the circular buffer.
 * Restrict to the amount of space available.
 *
 * Return the number of bytes copied.
 */

static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf,
	unsigned int count)
{

	unsigned int len;


	if (cb == NULL)
		return 0;

	len  = cypress_buf_space_avail(cb);
	if (count > len)
		count = len;

	if (count == 0)
		return 0;

	len = cb->buf_buf + cb->buf_size - cb->buf_put;
	if (count > len) {
		memcpy(cb->buf_put, buf, len);
		memcpy(cb->buf_buf, buf+len, count - len);
		cb->buf_put = cb->buf_buf + count - len;
	} else {
		memcpy(cb->buf_put, buf, count);
		if (count < len)
			cb->buf_put += count;
		else /* count == len */
			cb->buf_put = cb->buf_buf;
	}

	return count;

}


/*
 * cypress_buf_get
 *
 * Get data from the circular buffer and copy to the given buffer.
 * Restrict to the amount of data available.
 *
 * Return the number of bytes copied.
 */

static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf,
	unsigned int count)
{

	unsigned int len;


	if (cb == NULL)
		return 0;

	len = cypress_buf_data_avail(cb);
	if (count > len)
		count = len;

	if (count == 0)
		return 0;

	len = cb->buf_buf + cb->buf_size - cb->buf_get;
	if (count > len) {
		memcpy(buf, cb->buf_get, len);
		memcpy(buf+len, cb->buf_buf, count - len);
		cb->buf_get = cb->buf_buf + count - len;
	} else {
		memcpy(buf, cb->buf_get, count);
		if (count < len)
			cb->buf_get += count;
		else /* count == len */
			cb->buf_get = cb->buf_buf;
	}

	return count;

}

/*****************************************************************************
 * Module functions
 *****************************************************************************/

static int __init cypress_init(void)
{
	int retval;
	
	dbg("%s", __FUNCTION__);
	
	retval = usb_serial_register(&cypress_earthmate_device);
	if (retval)
		goto failed_em_register;
	retval = usb_serial_register(&cypress_hidcom_device);
	if (retval)
		goto failed_hidcom_register;
	retval = usb_serial_register(&cypress_ca42v2_device);
	if (retval)
		goto failed_ca42v2_register;
	retval = usb_register(&cypress_driver);
	if (retval)
		goto failed_usb_register;

	info(DRIVER_DESC " " DRIVER_VERSION);
	return 0;

failed_usb_register:
	usb_serial_deregister(&cypress_ca42v2_device);
failed_ca42v2_register:
	usb_serial_deregister(&cypress_hidcom_device);
failed_hidcom_register:
	usb_serial_deregister(&cypress_earthmate_device);
failed_em_register:
	return retval;
}


static void __exit cypress_exit (void)
{
	dbg("%s", __FUNCTION__);

	usb_deregister (&cypress_driver);
	usb_serial_deregister (&cypress_earthmate_device);
	usb_serial_deregister (&cypress_hidcom_device);
	usb_serial_deregister (&cypress_ca42v2_device);
}


module_init(cypress_init);
module_exit(cypress_exit);

MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_VERSION( DRIVER_VERSION );
MODULE_LICENSE("GPL");

module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
module_param(stats, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(stats, "Enable statistics or not");
module_param(interval, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(interval, "Overrides interrupt interval");