aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/serial/option.c
blob: e3e71c5f1a7045744c085e2765213426ce47ab4a (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
/*
  USB Driver for GSM modems

  Copyright (C) 2005  Matthias Urlichs <smurf@smurf.noris.de>

  This driver is free software; you can redistribute it and/or modify
  it under the terms of Version 2 of the GNU General Public License as
  published by the Free Software Foundation.

  Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>

  History: see the git log.

  Work sponsored by: Sigos GmbH, Germany <info@sigos.de>

  This driver exists because the "normal" serial driver doesn't work too well
  with GSM modems. Issues:
  - data loss -- one single Receive URB is not nearly enough
  - nonstandard flow (Option devices) control
  - controlling the baud rate doesn't make sense

  This driver is named "option" because the most common device it's
  used for is a PC-Card (with an internal OHCI-USB interface, behind
  which the GSM interface sits), made by Option Inc.

  Some of the "one port" devices actually exhibit multiple USB instances
  on the USB bus. This is not a bug, these ports are used for different
  device features.
*/

#define DRIVER_VERSION "v0.7.1"
#define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
#define DRIVER_DESC "USB Driver for GSM modems"

#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>

/* Function prototypes */
static int  option_open(struct usb_serial_port *port, struct file *filp);
static void option_close(struct usb_serial_port *port, struct file *filp);
static int  option_startup(struct usb_serial *serial);
static void option_shutdown(struct usb_serial *serial);
static void option_rx_throttle(struct usb_serial_port *port);
static void option_rx_unthrottle(struct usb_serial_port *port);
static int  option_write_room(struct usb_serial_port *port);

static void option_instat_callback(struct urb *urb);

static int option_write(struct usb_serial_port *port,
			const unsigned char *buf, int count);

static int  option_chars_in_buffer(struct usb_serial_port *port);
static int  option_ioctl(struct usb_serial_port *port, struct file *file,
			unsigned int cmd, unsigned long arg);
static void option_set_termios(struct usb_serial_port *port,
				struct ktermios *old);
static void option_break_ctl(struct usb_serial_port *port, int break_state);
static int  option_tiocmget(struct usb_serial_port *port, struct file *file);
static int  option_tiocmset(struct usb_serial_port *port, struct file *file,
				unsigned int set, unsigned int clear);
static int  option_send_setup(struct usb_serial_port *port);

/* Vendor and product IDs */
#define OPTION_VENDOR_ID			0x0AF0
#define OPTION_PRODUCT_COLT			0x5000
#define OPTION_PRODUCT_RICOLA			0x6000
#define OPTION_PRODUCT_RICOLA_LIGHT		0x6100
#define OPTION_PRODUCT_RICOLA_QUAD		0x6200
#define OPTION_PRODUCT_RICOLA_QUAD_LIGHT	0x6300
#define OPTION_PRODUCT_RICOLA_NDIS		0x6050
#define OPTION_PRODUCT_RICOLA_NDIS_LIGHT	0x6150
#define OPTION_PRODUCT_RICOLA_NDIS_QUAD		0x6250
#define OPTION_PRODUCT_RICOLA_NDIS_QUAD_LIGHT	0x6350
#define OPTION_PRODUCT_COBRA			0x6500
#define OPTION_PRODUCT_COBRA_BUS		0x6501
#define OPTION_PRODUCT_VIPER			0x6600
#define OPTION_PRODUCT_VIPER_BUS		0x6601
#define OPTION_PRODUCT_GT_MAX_READY		0x6701
#define OPTION_PRODUCT_GT_MAX			0x6711
#define OPTION_PRODUCT_FUJI_MODEM_LIGHT		0x6721
#define OPTION_PRODUCT_FUJI_MODEM_GT		0x6741
#define OPTION_PRODUCT_FUJI_MODEM_EX		0x6761
#define OPTION_PRODUCT_FUJI_NETWORK_LIGHT	0x6731
#define OPTION_PRODUCT_FUJI_NETWORK_GT		0x6751
#define OPTION_PRODUCT_FUJI_NETWORK_EX		0x6771
#define OPTION_PRODUCT_KOI_MODEM		0x6800
#define OPTION_PRODUCT_KOI_NETWORK		0x6811
#define OPTION_PRODUCT_SCORPION_MODEM		0x6901
#define OPTION_PRODUCT_SCORPION_NETWORK		0x6911
#define OPTION_PRODUCT_ETNA_MODEM		0x7001
#define OPTION_PRODUCT_ETNA_NETWORK		0x7011
#define OPTION_PRODUCT_ETNA_MODEM_LITE		0x7021
#define OPTION_PRODUCT_ETNA_MODEM_GT		0x7041
#define OPTION_PRODUCT_ETNA_MODEM_EX		0x7061
#define OPTION_PRODUCT_ETNA_NETWORK_LITE	0x7031
#define OPTION_PRODUCT_ETNA_NETWORK_GT		0x7051
#define OPTION_PRODUCT_ETNA_NETWORK_EX		0x7071
#define OPTION_PRODUCT_ETNA_KOI_MODEM		0x7100
#define OPTION_PRODUCT_ETNA_KOI_NETWORK		0x7111

#define HUAWEI_VENDOR_ID			0x12D1
#define HUAWEI_PRODUCT_E600			0x1001
#define HUAWEI_PRODUCT_E220			0x1003
#define HUAWEI_PRODUCT_E220BIS			0x1004

#define NOVATELWIRELESS_VENDOR_ID		0x1410
#define DELL_VENDOR_ID				0x413C

#define ANYDATA_VENDOR_ID			0x16d5
#define ANYDATA_PRODUCT_ADU_E100A		0x6501
#define ANYDATA_PRODUCT_ADU_500A		0x6502

#define BANDRICH_VENDOR_ID			0x1A8D
#define BANDRICH_PRODUCT_C100_1			0x1002
#define BANDRICH_PRODUCT_C100_2			0x1003

static struct usb_device_id option_ids[] = {
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_COLT) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_LIGHT) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_QUAD) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_QUAD_LIGHT) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_NDIS) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_NDIS_LIGHT) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_NDIS_QUAD) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_NDIS_QUAD_LIGHT) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_COBRA) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_COBRA_BUS) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_VIPER) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_VIPER_BUS) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_GT_MAX_READY) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_GT_MAX) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_FUJI_MODEM_LIGHT) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_FUJI_MODEM_GT) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_FUJI_MODEM_EX) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_FUJI_NETWORK_LIGHT) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_FUJI_NETWORK_GT) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_FUJI_NETWORK_EX) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_KOI_MODEM) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_KOI_NETWORK) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_SCORPION_MODEM) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_SCORPION_NETWORK) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_ETNA_MODEM) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_ETNA_NETWORK) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_ETNA_MODEM_LITE) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_ETNA_MODEM_GT) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_ETNA_MODEM_EX) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_ETNA_NETWORK_LITE) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_ETNA_NETWORK_GT) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_ETNA_NETWORK_EX) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_ETNA_KOI_MODEM) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_ETNA_KOI_NETWORK) },
	{ USB_DEVICE(HUAWEI_VENDOR_ID, HUAWEI_PRODUCT_E600) },
	{ USB_DEVICE_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, HUAWEI_PRODUCT_E220, 0xff, 0xff, 0xff) },
	{ USB_DEVICE_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, HUAWEI_PRODUCT_E220BIS, 0xff, 0xff, 0xff) },
	{ USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, 0x1100) }, /* Novatel Merlin XS620/S640 */
	{ USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, 0x1110) }, /* Novatel Merlin S620 */
	{ USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, 0x1120) }, /* Novatel Merlin EX720 */
	{ USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, 0x1130) }, /* Novatel Merlin S720 */
	{ USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, 0x1400) }, /* Novatel U730 */
	{ USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, 0x1410) }, /* Novatel U740 */
	{ USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, 0x1420) }, /* Novatel EU870 */
	{ USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, 0x1430) }, /* Novatel Merlin XU870 HSDPA/3G */
	{ USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, 0x2100) }, /* Novatel EV620 CDMA/EV-DO */
	{ USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, 0x2110) }, /* Novatel Merlin ES620 / Merlin ES720 / Ovation U720 */
	{ USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, 0x2130) }, /* Novatel Merlin ES620 SM Bus */
	{ USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, 0x2410) }, /* Novatel EU740 */
	{ USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, 0x4100) }, /* Novatel U727 */
	{ USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, 0x4400) }, /* Novatel MC950 */
	{ USB_DEVICE(DELL_VENDOR_ID, 0x8114) },	/* Dell Wireless 5700 Mobile Broadband CDMA/EVDO Mini-Card == Novatel Expedite EV620 CDMA/EV-DO */
	{ USB_DEVICE(DELL_VENDOR_ID, 0x8115) },	/* Dell Wireless 5500 Mobile Broadband HSDPA Mini-Card == Novatel Expedite EU740 HSDPA/3G */
	{ USB_DEVICE(DELL_VENDOR_ID, 0x8116) },	/* Dell Wireless 5505 Mobile Broadband HSDPA Mini-Card == Novatel Expedite EU740 HSDPA/3G */
	{ USB_DEVICE(DELL_VENDOR_ID, 0x8117) },	/* Dell Wireless 5700 Mobile Broadband CDMA/EVDO ExpressCard == Novatel Merlin XV620 CDMA/EV-DO */
	{ USB_DEVICE(DELL_VENDOR_ID, 0x8118) },	/* Dell Wireless 5510 Mobile Broadband HSDPA ExpressCard == Novatel Merlin XU870 HSDPA/3G */
	{ USB_DEVICE(DELL_VENDOR_ID, 0x8128) },	/* Dell Wireless 5700 Mobile Broadband CDMA/EVDO Mini-Card == Novatel Expedite E720 CDMA/EV-DO */
	{ USB_DEVICE(DELL_VENDOR_ID, 0x8136) },	/* Dell Wireless HSDPA 5520 == Novatel Expedite EU860D */
	{ USB_DEVICE(DELL_VENDOR_ID, 0x8129) },	/* Dell Wireless 5700 Mobile Broadband CDMA/EVDO Mini-Card == Novatel Expedite ET620 CDMA/EV-DO */
	{ USB_DEVICE(DELL_VENDOR_ID, 0x8137) },	/* Dell Wireless HSDPA 5520 */
	{ USB_DEVICE(ANYDATA_VENDOR_ID, ANYDATA_PRODUCT_ADU_E100A) },
	{ USB_DEVICE(ANYDATA_VENDOR_ID, ANYDATA_PRODUCT_ADU_500A) },
	{ USB_DEVICE(BANDRICH_VENDOR_ID, BANDRICH_PRODUCT_C100_1) },
	{ USB_DEVICE(BANDRICH_VENDOR_ID, BANDRICH_PRODUCT_C100_2) },
	{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, option_ids);

static struct usb_driver option_driver = {
	.name       = "option",
	.probe      = usb_serial_probe,
	.disconnect = usb_serial_disconnect,
	.id_table   = option_ids,
	.no_dynamic_id = 	1,
};

/* The card has three separate interfaces, which the serial driver
 * recognizes separately, thus num_port=1.
 */

static struct usb_serial_driver option_1port_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"option1",
	},
	.description       = "GSM modem (1-port)",
	.usb_driver        = &option_driver,
	.id_table          = option_ids,
	.num_interrupt_in  = NUM_DONT_CARE,
	.num_bulk_in       = NUM_DONT_CARE,
	.num_bulk_out      = NUM_DONT_CARE,
	.num_ports         = 1,
	.open              = option_open,
	.close             = option_close,
	.write             = option_write,
	.write_room        = option_write_room,
	.chars_in_buffer   = option_chars_in_buffer,
	.throttle          = option_rx_throttle,
	.unthrottle        = option_rx_unthrottle,
	.ioctl             = option_ioctl,
	.set_termios       = option_set_termios,
	.break_ctl         = option_break_ctl,
	.tiocmget          = option_tiocmget,
	.tiocmset          = option_tiocmset,
	.attach            = option_startup,
	.shutdown          = option_shutdown,
	.read_int_callback = option_instat_callback,
};

#ifdef CONFIG_USB_DEBUG
static int debug;
#else
#define debug 0
#endif

/* per port private data */

#define N_IN_URB 4
#define N_OUT_URB 1
#define IN_BUFLEN 4096
#define OUT_BUFLEN 128

struct option_port_private {
	/* Input endpoints and buffer for this port */
	struct urb *in_urbs[N_IN_URB];
	u8 *in_buffer[N_IN_URB];
	/* Output endpoints and buffer for this port */
	struct urb *out_urbs[N_OUT_URB];
	u8 *out_buffer[N_OUT_URB];
	unsigned long out_busy;		/* Bit vector of URBs in use */

	/* Settings for the port */
	int rts_state;	/* Handshaking pins (outputs) */
	int dtr_state;
	int cts_state;	/* Handshaking pins (inputs) */
	int dsr_state;
	int dcd_state;
	int ri_state;

	unsigned long tx_start_time[N_OUT_URB];
};

/* Functions used by new usb-serial code. */
static int __init option_init(void)
{
	int retval;
	retval = usb_serial_register(&option_1port_device);
	if (retval)
		goto failed_1port_device_register;
	retval = usb_register(&option_driver);
	if (retval)
		goto failed_driver_register;

	info(DRIVER_DESC ": " DRIVER_VERSION);

	return 0;

failed_driver_register:
	usb_serial_deregister (&option_1port_device);
failed_1port_device_register:
	return retval;
}

static void __exit option_exit(void)
{
	usb_deregister (&option_driver);
	usb_serial_deregister (&option_1port_device);
}

module_init(option_init);
module_exit(option_exit);

static void option_rx_throttle(struct usb_serial_port *port)
{
	dbg("%s", __FUNCTION__);
}

static void option_rx_unthrottle(struct usb_serial_port *port)
{
	dbg("%s", __FUNCTION__);
}

static void option_break_ctl(struct usb_serial_port *port, int break_state)
{
	/* Unfortunately, I don't know how to send a break */
	dbg("%s", __FUNCTION__);
}

static void option_set_termios(struct usb_serial_port *port,
			struct ktermios *old_termios)
{
	dbg("%s", __FUNCTION__);
	/* Doesn't support option setting */
	tty_termios_copy_hw(port->tty->termios, old_termios);
	option_send_setup(port);
}

static int option_tiocmget(struct usb_serial_port *port, struct file *file)
{
	unsigned int value;
	struct option_port_private *portdata;

	portdata = usb_get_serial_port_data(port);

	value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
		((portdata->dtr_state) ? TIOCM_DTR : 0) |
		((portdata->cts_state) ? TIOCM_CTS : 0) |
		((portdata->dsr_state) ? TIOCM_DSR : 0) |
		((portdata->dcd_state) ? TIOCM_CAR : 0) |
		((portdata->ri_state) ? TIOCM_RNG : 0);

	return value;
}

static int option_tiocmset(struct usb_serial_port *port, struct file *file,
			unsigned int set, unsigned int clear)
{
	struct option_port_private *portdata;

	portdata = usb_get_serial_port_data(port);

	if (set & TIOCM_RTS)
		portdata->rts_state = 1;
	if (set & TIOCM_DTR)
		portdata->dtr_state = 1;

	if (clear & TIOCM_RTS)
		portdata->rts_state = 0;
	if (clear & TIOCM_DTR)
		portdata->dtr_state = 0;
	return option_send_setup(port);
}

static int option_ioctl(struct usb_serial_port *port, struct file *file,
			unsigned int cmd, unsigned long arg)
{
	return -ENOIOCTLCMD;
}

/* Write */
static int option_write(struct usb_serial_port *port,
			const unsigned char *buf, int count)
{
	struct option_port_private *portdata;
	int i;
	int left, todo;
	struct urb *this_urb = NULL; /* spurious */
	int err;

	portdata = usb_get_serial_port_data(port);

	dbg("%s: write (%d chars)", __FUNCTION__, count);

	i = 0;
	left = count;
	for (i=0; left > 0 && i < N_OUT_URB; i++) {
		todo = left;
		if (todo > OUT_BUFLEN)
			todo = OUT_BUFLEN;

		this_urb = portdata->out_urbs[i];
		if (test_and_set_bit(i, &portdata->out_busy)) {
			if (time_before(jiffies,
					portdata->tx_start_time[i] + 10 * HZ))
				continue;
			usb_unlink_urb(this_urb);
			continue;
		}
		if (this_urb->status != 0)
			dbg("usb_write %p failed (err=%d)",
				this_urb, this_urb->status);

		dbg("%s: endpoint %d buf %d", __FUNCTION__,
			usb_pipeendpoint(this_urb->pipe), i);

		/* send the data */
		memcpy (this_urb->transfer_buffer, buf, todo);
		this_urb->transfer_buffer_length = todo;

		this_urb->dev = port->serial->dev;
		err = usb_submit_urb(this_urb, GFP_ATOMIC);
		if (err) {
			dbg("usb_submit_urb %p (write bulk) failed "
				"(%d, has %d)", this_urb,
				err, this_urb->status);
			clear_bit(i, &portdata->out_busy);
			continue;
		}
		portdata->tx_start_time[i] = jiffies;
		buf += todo;
		left -= todo;
	}

	count -= left;
	dbg("%s: wrote (did %d)", __FUNCTION__, count);
	return count;
}

static void option_indat_callback(struct urb *urb)
{
	int err;
	int endpoint;
	struct usb_serial_port *port;
	struct tty_struct *tty;
	unsigned char *data = urb->transfer_buffer;
	int status = urb->status;

	dbg("%s: %p", __FUNCTION__, urb);

	endpoint = usb_pipeendpoint(urb->pipe);
	port = (struct usb_serial_port *) urb->context;

	if (status) {
		dbg("%s: nonzero status: %d on endpoint %02x.",
		    __FUNCTION__, status, endpoint);
	} else {
		tty = port->tty;
		if (urb->actual_length) {
			tty_buffer_request_room(tty, urb->actual_length);
			tty_insert_flip_string(tty, data, urb->actual_length);
			tty_flip_buffer_push(tty);
		} else {
			dbg("%s: empty read urb received", __FUNCTION__);
		}

		/* Resubmit urb so we continue receiving */
		if (port->open_count && status != -ESHUTDOWN) {
			err = usb_submit_urb(urb, GFP_ATOMIC);
			if (err)
				printk(KERN_ERR "%s: resubmit read urb failed. "
					"(%d)", __FUNCTION__, err);
		}
	}
	return;
}

static void option_outdat_callback(struct urb *urb)
{
	struct usb_serial_port *port;
	struct option_port_private *portdata;
	int i;

	dbg("%s", __FUNCTION__);

	port = (struct usb_serial_port *) urb->context;

	usb_serial_port_softint(port);

	portdata = usb_get_serial_port_data(port);
	for (i = 0; i < N_OUT_URB; ++i) {
		if (portdata->out_urbs[i] == urb) {
			smp_mb__before_clear_bit();
			clear_bit(i, &portdata->out_busy);
			break;
		}
	}
}

static void option_instat_callback(struct urb *urb)
{
	int err;
	int status = urb->status;
	struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
	struct option_port_private *portdata = usb_get_serial_port_data(port);
	struct usb_serial *serial = port->serial;

	dbg("%s", __FUNCTION__);
	dbg("%s: urb %p port %p has data %p", __FUNCTION__,urb,port,portdata);

	if (status == 0) {
		struct usb_ctrlrequest *req_pkt =
				(struct usb_ctrlrequest *)urb->transfer_buffer;

		if (!req_pkt) {
			dbg("%s: NULL req_pkt\n", __FUNCTION__);
			return;
		}
		if ((req_pkt->bRequestType == 0xA1) &&
				(req_pkt->bRequest == 0x20)) {
			int old_dcd_state;
			unsigned char signals = *((unsigned char *)
					urb->transfer_buffer +
					sizeof(struct usb_ctrlrequest));

			dbg("%s: signal x%x", __FUNCTION__, signals);

			old_dcd_state = portdata->dcd_state;
			portdata->cts_state = 1;
			portdata->dcd_state = ((signals & 0x01) ? 1 : 0);
			portdata->dsr_state = ((signals & 0x02) ? 1 : 0);
			portdata->ri_state = ((signals & 0x08) ? 1 : 0);

			if (port->tty && !C_CLOCAL(port->tty) &&
					old_dcd_state && !portdata->dcd_state)
				tty_hangup(port->tty);
		} else {
			dbg("%s: type %x req %x", __FUNCTION__,
				req_pkt->bRequestType,req_pkt->bRequest);
		}
	} else
		dbg("%s: error %d", __FUNCTION__, status);

	/* Resubmit urb so we continue receiving IRQ data */
	if (status != -ESHUTDOWN) {
		urb->dev = serial->dev;
		err = usb_submit_urb(urb, GFP_ATOMIC);
		if (err)
			dbg("%s: resubmit intr urb failed. (%d)",
				__FUNCTION__, err);
	}
}

static int option_write_room(struct usb_serial_port *port)
{
	struct option_port_private *portdata;
	int i;
	int data_len = 0;
	struct urb *this_urb;

	portdata = usb_get_serial_port_data(port);

	for (i=0; i < N_OUT_URB; i++) {
		this_urb = portdata->out_urbs[i];
		if (this_urb && !test_bit(i, &portdata->out_busy))
			data_len += OUT_BUFLEN;
	}

	dbg("%s: %d", __FUNCTION__, data_len);
	return data_len;
}

static int option_chars_in_buffer(struct usb_serial_port *port)
{
	struct option_port_private *portdata;
	int i;
	int data_len = 0;
	struct urb *this_urb;

	portdata = usb_get_serial_port_data(port);

	for (i=0; i < N_OUT_URB; i++) {
		this_urb = portdata->out_urbs[i];
		if (this_urb && test_bit(i, &portdata->out_busy))
			data_len += this_urb->transfer_buffer_length;
	}
	dbg("%s: %d", __FUNCTION__, data_len);
	return data_len;
}

static int option_open(struct usb_serial_port *port, struct file *filp)
{
	struct option_port_private *portdata;
	struct usb_serial *serial = port->serial;
	int i, err;
	struct urb *urb;

	portdata = usb_get_serial_port_data(port);

	dbg("%s", __FUNCTION__);

	/* Set some sane defaults */
	portdata->rts_state = 1;
	portdata->dtr_state = 1;

	/* Reset low level data toggle and start reading from endpoints */
	for (i = 0; i < N_IN_URB; i++) {
		urb = portdata->in_urbs[i];
		if (! urb)
			continue;
		if (urb->dev != serial->dev) {
			dbg("%s: dev %p != %p", __FUNCTION__,
				urb->dev, serial->dev);
			continue;
		}

		/*
		 * make sure endpoint data toggle is synchronized with the
		 * device
		 */
		usb_clear_halt(urb->dev, urb->pipe);

		err = usb_submit_urb(urb, GFP_KERNEL);
		if (err) {
			dbg("%s: submit urb %d failed (%d) %d",
				__FUNCTION__, i, err,
				urb->transfer_buffer_length);
		}
	}

	/* Reset low level data toggle on out endpoints */
	for (i = 0; i < N_OUT_URB; i++) {
		urb = portdata->out_urbs[i];
		if (! urb)
			continue;
		urb->dev = serial->dev;
		/* usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
				usb_pipeout(urb->pipe), 0); */
	}

	port->tty->low_latency = 1;

	option_send_setup(port);

	return (0);
}

static void option_close(struct usb_serial_port *port, struct file *filp)
{
	int i;
	struct usb_serial *serial = port->serial;
	struct option_port_private *portdata;

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

	portdata->rts_state = 0;
	portdata->dtr_state = 0;

	if (serial->dev) {
		mutex_lock(&serial->disc_mutex);
		if (!serial->disconnected)
			option_send_setup(port);
		mutex_unlock(&serial->disc_mutex);

		/* Stop reading/writing urbs */
		for (i = 0; i < N_IN_URB; i++)
			usb_kill_urb(portdata->in_urbs[i]);
		for (i = 0; i < N_OUT_URB; i++)
			usb_kill_urb(portdata->out_urbs[i]);
	}
	port->tty = NULL;
}

/* Helper functions used by option_setup_urbs */
static struct urb *option_setup_urb(struct usb_serial *serial, int endpoint,
		int dir, void *ctx, char *buf, int len,
		void (*callback)(struct urb *))
{
	struct urb *urb;

	if (endpoint == -1)
		return NULL;		/* endpoint not needed */

	urb = usb_alloc_urb(0, GFP_KERNEL);		/* No ISO */
	if (urb == NULL) {
		dbg("%s: alloc for endpoint %d failed.", __FUNCTION__, endpoint);
		return NULL;
	}

		/* Fill URB using supplied data. */
	usb_fill_bulk_urb(urb, serial->dev,
		      usb_sndbulkpipe(serial->dev, endpoint) | dir,
		      buf, len, callback, ctx);

	return urb;
}

/* Setup urbs */
static void option_setup_urbs(struct usb_serial *serial)
{
	int i,j;
	struct usb_serial_port *port;
	struct option_port_private *portdata;

	dbg("%s", __FUNCTION__);

	for (i = 0; i < serial->num_ports; i++) {
		port = serial->port[i];
		portdata = usb_get_serial_port_data(port);

	/* Do indat endpoints first */
		for (j = 0; j < N_IN_URB; ++j) {
			portdata->in_urbs[j] = option_setup_urb (serial,
                  	port->bulk_in_endpointAddress, USB_DIR_IN, port,
                  	portdata->in_buffer[j], IN_BUFLEN, option_indat_callback);
		}

		/* outdat endpoints */
		for (j = 0; j < N_OUT_URB; ++j) {
			portdata->out_urbs[j] = option_setup_urb (serial,
                  	port->bulk_out_endpointAddress, USB_DIR_OUT, port,
                  	portdata->out_buffer[j], OUT_BUFLEN, option_outdat_callback);
		}
	}
}

static int option_send_setup(struct usb_serial_port *port)
{
	struct usb_serial *serial = port->serial;
	struct option_port_private *portdata;

	dbg("%s", __FUNCTION__);

	if (port->number != 0)
		return 0;

	portdata = usb_get_serial_port_data(port);

	if (port->tty) {
		int val = 0;
		if (portdata->dtr_state)
			val |= 0x01;
		if (portdata->rts_state)
			val |= 0x02;

		return usb_control_msg(serial->dev,
				usb_rcvctrlpipe(serial->dev, 0),
				0x22,0x21,val,0,NULL,0,USB_CTRL_SET_TIMEOUT);
	}

	return 0;
}

static int option_startup(struct usb_serial *serial)
{
	int i, j, err;
	struct usb_serial_port *port;
	struct option_port_private *portdata;
	u8 *buffer;

	dbg("%s", __FUNCTION__);

	/* Now setup per port private data */
	for (i = 0; i < serial->num_ports; i++) {
		port = serial->port[i];
		portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
		if (!portdata) {
			dbg("%s: kmalloc for option_port_private (%d) failed!.",
					__FUNCTION__, i);
			return (1);
		}

		for (j = 0; j < N_IN_URB; j++) {
			buffer = (u8 *)__get_free_page(GFP_KERNEL);
			if (!buffer)
				goto bail_out_error;
			portdata->in_buffer[j] = buffer;
		}

		for (j = 0; j < N_OUT_URB; j++) {
			buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
			if (!buffer)
				goto bail_out_error2;
			portdata->out_buffer[j] = buffer;
		}

		usb_set_serial_port_data(port, portdata);

		if (! port->interrupt_in_urb)
			continue;
		err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
		if (err)
			dbg("%s: submit irq_in urb failed %d",
				__FUNCTION__, err);
	}

	option_setup_urbs(serial);

	return (0);

bail_out_error2:
	for (j = 0; j < N_OUT_URB; j++)
		kfree(portdata->out_buffer[j]);
bail_out_error:
	for (j = 0; j < N_IN_URB; j++)
		if (portdata->in_buffer[j])
			free_page((unsigned long)portdata->in_buffer[j]);
	kfree(portdata);
	return 1;
}

static void option_shutdown(struct usb_serial *serial)
{
	int i, j;
	struct usb_serial_port *port;
	struct option_port_private *portdata;

	dbg("%s", __FUNCTION__);

	/* Stop reading/writing urbs */
	for (i = 0; i < serial->num_ports; ++i) {
		port = serial->port[i];
		portdata = usb_get_serial_port_data(port);
		for (j = 0; j < N_IN_URB; j++)
			usb_kill_urb(portdata->in_urbs[j]);
		for (j = 0; j < N_OUT_URB; j++)
			usb_kill_urb(portdata->out_urbs[j]);
	}

	/* Now free them */
	for (i = 0; i < serial->num_ports; ++i) {
		port = serial->port[i];
		portdata = usb_get_serial_port_data(port);

		for (j = 0; j < N_IN_URB; j++) {
			if (portdata->in_urbs[j]) {
				usb_free_urb(portdata->in_urbs[j]);
				free_page((unsigned long)portdata->in_buffer[j]);
				portdata->in_urbs[j] = NULL;
			}
		}
		for (j = 0; j < N_OUT_URB; j++) {
			if (portdata->out_urbs[j]) {
				usb_free_urb(portdata->out_urbs[j]);
				kfree(portdata->out_buffer[j]);
				portdata->out_urbs[j] = NULL;
			}
		}
	}

	/* Now free per port private data */
	for (i = 0; i < serial->num_ports; i++) {
		port = serial->port[i];
		kfree(usb_get_serial_port_data(port));
	}
}

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

#ifdef CONFIG_USB_DEBUG
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug messages");
#endif