aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb/serial/sierra.c
blob: 5b88b6836a818b2fcfc6d22059295b084bb9ed72 (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
/*
  USB Driver for Sierra Wireless

  Copyright (C) 2006, 2007, 2008  Kevin Lloyd <klloyd@sierrawireless.com>,

  Copyright (C) 2008, 2009  Elina Pasheva, Matthew Safar, Rory Filer
			<linux@sierrawireless.com>

  IMPORTANT DISCLAIMER: This driver is not commercially supported by
  Sierra Wireless. Use at your own risk.

  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 based on the option driver by Matthias Urlichs <smurf@smurf.noris.de>
  Whom based his on the Keyspan driver by Hugh Blemings <hugh@blemings.org>
*/
/* Uncomment to log function calls */
/* #define DEBUG */
#define DRIVER_VERSION "v.1.7.16"
#define DRIVER_AUTHOR "Kevin Lloyd, Elina Pasheva, Matthew Safar, Rory Filer"
#define DRIVER_DESC "USB Driver for Sierra Wireless USB modems"

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

#define SWIMS_USB_REQUEST_SetPower	0x00
#define SWIMS_USB_REQUEST_SetNmea	0x07

#define N_IN_URB_HM	8
#define N_OUT_URB_HM	64
#define N_IN_URB	4
#define N_OUT_URB	4
#define IN_BUFLEN	4096

#define MAX_TRANSFER		(PAGE_SIZE - 512)
/* MAX_TRANSFER is chosen so that the VM is not stressed by
   allocations > PAGE_SIZE and the number of packets in a page
   is an integer 512 is the largest possible packet on EHCI */

static int debug;
static int nmea;

/* Used in interface blacklisting */
struct sierra_iface_info {
	const u32 infolen;	/* number of interface numbers on blacklist */
	const u8  *ifaceinfo;	/* pointer to the array holding the numbers */
};

struct sierra_intf_private {
	spinlock_t susp_lock;
	unsigned int suspended:1;
	int in_flight;
};

static int sierra_set_power_state(struct usb_device *udev, __u16 swiState)
{
	int result;
	dev_dbg(&udev->dev, "%s\n", __func__);
	result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
			SWIMS_USB_REQUEST_SetPower,	/* __u8 request      */
			USB_TYPE_VENDOR,		/* __u8 request type */
			swiState,			/* __u16 value       */
			0,				/* __u16 index       */
			NULL,				/* void *data        */
			0,				/* __u16 size 	     */
			USB_CTRL_SET_TIMEOUT);		/* int timeout 	     */
	return result;
}

static int sierra_vsc_set_nmea(struct usb_device *udev, __u16 enable)
{
	int result;
	dev_dbg(&udev->dev, "%s\n", __func__);
	result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
			SWIMS_USB_REQUEST_SetNmea,	/* __u8 request      */
			USB_TYPE_VENDOR,		/* __u8 request type */
			enable,				/* __u16 value       */
			0x0000,				/* __u16 index       */
			NULL,				/* void *data        */
			0,				/* __u16 size 	     */
			USB_CTRL_SET_TIMEOUT);		/* int timeout       */
	return result;
}

static int sierra_calc_num_ports(struct usb_serial *serial)
{
	int num_ports = 0;
	u8 ifnum, numendpoints;

	dev_dbg(&serial->dev->dev, "%s\n", __func__);

	ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
	numendpoints = serial->interface->cur_altsetting->desc.bNumEndpoints;

	/* Dummy interface present on some SKUs should be ignored */
	if (ifnum == 0x99)
		num_ports = 0;
	else if (numendpoints <= 3)
		num_ports = 1;
	else
		num_ports = (numendpoints-1)/2;
	return num_ports;
}

static int is_blacklisted(const u8 ifnum,
				const struct sierra_iface_info *blacklist)
{
	const u8  *info;
	int i;

	if (blacklist) {
		info = blacklist->ifaceinfo;

		for (i = 0; i < blacklist->infolen; i++) {
			if (info[i] == ifnum)
				return 1;
		}
	}
	return 0;
}

static int is_himemory(const u8 ifnum,
				const struct sierra_iface_info *himemorylist)
{
	const u8  *info;
	int i;

	if (himemorylist) {
		info = himemorylist->ifaceinfo;

		for (i=0; i < himemorylist->infolen; i++) {
			if (info[i] == ifnum)
				return 1;
		}
	}
	return 0;
}

static int sierra_calc_interface(struct usb_serial *serial)
{
	int interface;
	struct usb_interface *p_interface;
	struct usb_host_interface *p_host_interface;
	dev_dbg(&serial->dev->dev, "%s\n", __func__);

	/* Get the interface structure pointer from the serial struct */
	p_interface = serial->interface;

	/* Get a pointer to the host interface structure */
	p_host_interface = p_interface->cur_altsetting;

	/* read the interface descriptor for this active altsetting
	 * to find out the interface number we are on
	*/
	interface = p_host_interface->desc.bInterfaceNumber;

	return interface;
}

static int sierra_probe(struct usb_serial *serial,
			const struct usb_device_id *id)
{
	int result = 0;
	struct usb_device *udev;
	struct sierra_intf_private *data;
	u8 ifnum;

	udev = serial->dev;
	dev_dbg(&udev->dev, "%s\n", __func__);

	ifnum = sierra_calc_interface(serial);
	/*
	 * If this interface supports more than 1 alternate
	 * select the 2nd one
	 */
	if (serial->interface->num_altsetting == 2) {
		dev_dbg(&udev->dev, "Selecting alt setting for interface %d\n",
			ifnum);
		/* We know the alternate setting is 1 for the MC8785 */
		usb_set_interface(udev, ifnum, 1);
	}

	/* ifnum could have changed - by calling usb_set_interface */
	ifnum = sierra_calc_interface(serial);

	if (is_blacklisted(ifnum,
				(struct sierra_iface_info *)id->driver_info)) {
		dev_dbg(&serial->dev->dev,
			"Ignoring blacklisted interface #%d\n", ifnum);
		return -ENODEV;
	}

	data = serial->private = kzalloc(sizeof(struct sierra_intf_private), GFP_KERNEL);
	if (!data)
		return -ENOMEM;
	spin_lock_init(&data->susp_lock);

	return result;
}

/* interfaces with higher memory requirements */
static const u8 hi_memory_typeA_ifaces[] = { 0, 2 };
static const struct sierra_iface_info typeA_interface_list = {
	.infolen = ARRAY_SIZE(hi_memory_typeA_ifaces),
	.ifaceinfo = hi_memory_typeA_ifaces,
};

static const u8 hi_memory_typeB_ifaces[] = { 3, 4, 5, 6 };
static const struct sierra_iface_info typeB_interface_list = {
	.infolen = ARRAY_SIZE(hi_memory_typeB_ifaces),
	.ifaceinfo = hi_memory_typeB_ifaces,
};

/* 'blacklist' of interfaces not served by this driver */
static const u8 direct_ip_non_serial_ifaces[] = { 7, 8, 9, 10, 11 };
static const struct sierra_iface_info direct_ip_interface_blacklist = {
	.infolen = ARRAY_SIZE(direct_ip_non_serial_ifaces),
	.ifaceinfo = direct_ip_non_serial_ifaces,
};

static const struct usb_device_id id_table[] = {
	{ USB_DEVICE(0x0F3D, 0x0112) }, /* Airprime/Sierra PC 5220 */
	{ USB_DEVICE(0x03F0, 0x1B1D) },	/* HP ev2200 a.k.a MC5720 */
	{ USB_DEVICE(0x03F0, 0x211D) }, /* HP ev2210 a.k.a MC5725 */
	{ USB_DEVICE(0x03F0, 0x1E1D) },	/* HP hs2300 a.k.a MC8775 */

	{ USB_DEVICE(0x1199, 0x0017) },	/* Sierra Wireless EM5625 */
	{ USB_DEVICE(0x1199, 0x0018) },	/* Sierra Wireless MC5720 */
	{ USB_DEVICE(0x1199, 0x0218) },	/* Sierra Wireless MC5720 */
	{ USB_DEVICE(0x1199, 0x0020) },	/* Sierra Wireless MC5725 */
	{ USB_DEVICE(0x1199, 0x0220) },	/* Sierra Wireless MC5725 */
	{ USB_DEVICE(0x1199, 0x0022) },	/* Sierra Wireless EM5725 */
	{ USB_DEVICE(0x1199, 0x0024) },	/* Sierra Wireless MC5727 */
	{ USB_DEVICE(0x1199, 0x0224) },	/* Sierra Wireless MC5727 */
	{ USB_DEVICE(0x1199, 0x0019) },	/* Sierra Wireless AirCard 595 */
	{ USB_DEVICE(0x1199, 0x0021) },	/* Sierra Wireless AirCard 597E */
	{ USB_DEVICE(0x1199, 0x0112) }, /* Sierra Wireless AirCard 580 */
	{ USB_DEVICE(0x1199, 0x0120) },	/* Sierra Wireless USB Dongle 595U */
	{ USB_DEVICE(0x1199, 0x0301) },	/* Sierra Wireless USB Dongle 250U */
	/* Sierra Wireless C597 */
	{ USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x0023, 0xFF, 0xFF, 0xFF) },
	/* Sierra Wireless T598 */
	{ USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x0025, 0xFF, 0xFF, 0xFF) },
	{ USB_DEVICE(0x1199, 0x0026) }, /* Sierra Wireless T11 */
	{ USB_DEVICE(0x1199, 0x0027) }, /* Sierra Wireless AC402 */
	{ USB_DEVICE(0x1199, 0x0028) }, /* Sierra Wireless MC5728 */
	{ USB_DEVICE(0x1199, 0x0029) }, /* Sierra Wireless Device */

	{ USB_DEVICE(0x1199, 0x6802) },	/* Sierra Wireless MC8755 */
	{ USB_DEVICE(0x1199, 0x6803) },	/* Sierra Wireless MC8765 */
	{ USB_DEVICE(0x1199, 0x6804) },	/* Sierra Wireless MC8755 */
	{ USB_DEVICE(0x1199, 0x6805) },	/* Sierra Wireless MC8765 */
	{ USB_DEVICE(0x1199, 0x6808) },	/* Sierra Wireless MC8755 */
	{ USB_DEVICE(0x1199, 0x6809) },	/* Sierra Wireless MC8765 */
	{ USB_DEVICE(0x1199, 0x6812) },	/* Sierra Wireless MC8775 & AC 875U */
	{ USB_DEVICE(0x1199, 0x6813) },	/* Sierra Wireless MC8775 */
	{ USB_DEVICE(0x1199, 0x6815) },	/* Sierra Wireless MC8775 */
	{ USB_DEVICE(0x1199, 0x6816) },	/* Sierra Wireless MC8775 */
	{ USB_DEVICE(0x1199, 0x6820) },	/* Sierra Wireless AirCard 875 */
	{ USB_DEVICE(0x1199, 0x6821) },	/* Sierra Wireless AirCard 875U */
	{ USB_DEVICE(0x1199, 0x6822) },	/* Sierra Wireless AirCard 875E */
	{ USB_DEVICE(0x1199, 0x6832) },	/* Sierra Wireless MC8780 */
	{ USB_DEVICE(0x1199, 0x6833) },	/* Sierra Wireless MC8781 */
	{ USB_DEVICE(0x1199, 0x6834) },	/* Sierra Wireless MC8780 */
	{ USB_DEVICE(0x1199, 0x6835) },	/* Sierra Wireless MC8781 */
	{ USB_DEVICE(0x1199, 0x6838) },	/* Sierra Wireless MC8780 */
	{ USB_DEVICE(0x1199, 0x6839) },	/* Sierra Wireless MC8781 */
	{ USB_DEVICE(0x1199, 0x683A) },	/* Sierra Wireless MC8785 */
	{ USB_DEVICE(0x1199, 0x683B) },	/* Sierra Wireless MC8785 Composite */
	/* Sierra Wireless MC8790, MC8791, MC8792 Composite */
	{ USB_DEVICE(0x1199, 0x683C) },
	{ USB_DEVICE(0x1199, 0x683D) },	/* Sierra Wireless MC8791 Composite */
	/* Sierra Wireless MC8790, MC8791, MC8792 */
	{ USB_DEVICE(0x1199, 0x683E) },
	{ USB_DEVICE(0x1199, 0x6850) },	/* Sierra Wireless AirCard 880 */
	{ USB_DEVICE(0x1199, 0x6851) },	/* Sierra Wireless AirCard 881 */
	{ USB_DEVICE(0x1199, 0x6852) },	/* Sierra Wireless AirCard 880 E */
	{ USB_DEVICE(0x1199, 0x6853) },	/* Sierra Wireless AirCard 881 E */
	{ USB_DEVICE(0x1199, 0x6855) },	/* Sierra Wireless AirCard 880 U */
	{ USB_DEVICE(0x1199, 0x6856) },	/* Sierra Wireless AirCard 881 U */
	{ USB_DEVICE(0x1199, 0x6859) },	/* Sierra Wireless AirCard 885 E */
	{ USB_DEVICE(0x1199, 0x685A) },	/* Sierra Wireless AirCard 885 E */
	/* Sierra Wireless C885 */
	{ USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6880, 0xFF, 0xFF, 0xFF)},
	/* Sierra Wireless C888, Air Card 501, USB 303, USB 304 */
	{ USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6890, 0xFF, 0xFF, 0xFF)},
	/* Sierra Wireless C22/C33 */
	{ USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6891, 0xFF, 0xFF, 0xFF)},
	/* Sierra Wireless HSPA Non-Composite Device */
	{ USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6892, 0xFF, 0xFF, 0xFF)},
	{ USB_DEVICE(0x1199, 0x6893) },	/* Sierra Wireless Device */
	{ USB_DEVICE(0x1199, 0x68A3), 	/* Sierra Wireless Direct IP modems */
	  .driver_info = (kernel_ulong_t)&direct_ip_interface_blacklist
	},
	{ USB_DEVICE(0x0f3d, 0x68A3), 	/* Airprime/Sierra Wireless Direct IP modems */
	  .driver_info = (kernel_ulong_t)&direct_ip_interface_blacklist
	},
       { USB_DEVICE(0x413C, 0x08133) }, /* Dell Computer Corp. Wireless 5720 VZW Mobile Broadband (EVDO Rev-A) Minicard GPS Port */

	{ }
};
MODULE_DEVICE_TABLE(usb, id_table);


struct sierra_port_private {
	spinlock_t lock;	/* lock the structure */
	int outstanding_urbs;	/* number of out urbs in flight */
	struct usb_anchor active;
	struct usb_anchor delayed;

	int num_out_urbs;
	int num_in_urbs;
	/* Input endpoints and buffers for this port */
	struct urb *in_urbs[N_IN_URB_HM];

	/* 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 int opened:1;
};

static int sierra_send_setup(struct usb_serial_port *port)
{
	struct usb_serial *serial = port->serial;
	struct sierra_port_private *portdata;
	__u16 interface = 0;
	int val = 0;
	int do_send = 0;
	int retval;

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

	portdata = usb_get_serial_port_data(port);

	if (portdata->dtr_state)
		val |= 0x01;
	if (portdata->rts_state)
		val |= 0x02;

	/* If composite device then properly report interface */
	if (serial->num_ports == 1) {
		interface = sierra_calc_interface(serial);
		/* Control message is sent only to interfaces with
		 * interrupt_in endpoints
		 */
		if (port->interrupt_in_urb) {
			/* send control message */
			do_send = 1;
		}
	}

	/* Otherwise the need to do non-composite mapping */
	else {
		if (port->bulk_out_endpointAddress == 2)
			interface = 0;
		else if (port->bulk_out_endpointAddress == 4)
			interface = 1;
		else if (port->bulk_out_endpointAddress == 5)
			interface = 2;

		do_send = 1;
	}
	if (!do_send)
		return 0;

	retval = usb_autopm_get_interface(serial->interface);
	if (retval < 0)
		return retval;

	retval = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
		0x22, 0x21, val, interface, NULL, 0, USB_CTRL_SET_TIMEOUT);
	usb_autopm_put_interface(serial->interface);

	return retval;
}

static void sierra_set_termios(struct tty_struct *tty,
		struct usb_serial_port *port, struct ktermios *old_termios)
{
	dev_dbg(&port->dev, "%s\n", __func__);
	tty_termios_copy_hw(tty->termios, old_termios);
	sierra_send_setup(port);
}

static int sierra_tiocmget(struct tty_struct *tty, struct file *file)
{
	struct usb_serial_port *port = tty->driver_data;
	unsigned int value;
	struct sierra_port_private *portdata;

	dev_dbg(&port->dev, "%s\n", __func__);
	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 sierra_tiocmset(struct tty_struct *tty, struct file *file,
			unsigned int set, unsigned int clear)
{
	struct usb_serial_port *port = tty->driver_data;
	struct sierra_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 sierra_send_setup(port);
}

static void sierra_release_urb(struct urb *urb)
{
	struct usb_serial_port *port;
	if (urb) {
		port =  urb->context;
		dev_dbg(&port->dev, "%s: %p\n", __func__, urb);
		kfree(urb->transfer_buffer);
		usb_free_urb(urb);
	}
}

static void sierra_outdat_callback(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	struct sierra_port_private *portdata = usb_get_serial_port_data(port);
	struct sierra_intf_private *intfdata;
	int status = urb->status;

	dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
	intfdata = port->serial->private;

	/* free up the transfer buffer, as usb_free_urb() does not do this */
	kfree(urb->transfer_buffer);
	usb_autopm_put_interface_async(port->serial->interface);
	if (status)
		dev_dbg(&port->dev, "%s - nonzero write bulk status "
		    "received: %d\n", __func__, status);

	spin_lock(&portdata->lock);
	--portdata->outstanding_urbs;
	spin_unlock(&portdata->lock);
	spin_lock(&intfdata->susp_lock);
	--intfdata->in_flight;
	spin_unlock(&intfdata->susp_lock);

	usb_serial_port_softint(port);
}

/* Write */
static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port,
					const unsigned char *buf, int count)
{
	struct sierra_port_private *portdata;
	struct sierra_intf_private *intfdata;
	struct usb_serial *serial = port->serial;
	unsigned long flags;
	unsigned char *buffer;
	struct urb *urb;
	size_t writesize = min((size_t)count, (size_t)MAX_TRANSFER);
	int retval = 0;

	/* verify that we actually have some data to write */
	if (count == 0)
		return 0;

	portdata = usb_get_serial_port_data(port);
	intfdata = serial->private;

	dev_dbg(&port->dev, "%s: write (%zd bytes)\n", __func__, writesize);
	spin_lock_irqsave(&portdata->lock, flags);
	dev_dbg(&port->dev, "%s - outstanding_urbs: %d\n", __func__,
		portdata->outstanding_urbs);
	if (portdata->outstanding_urbs > portdata->num_out_urbs) {
		spin_unlock_irqrestore(&portdata->lock, flags);
		dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
		return 0;
	}
	portdata->outstanding_urbs++;
	dev_dbg(&port->dev, "%s - 1, outstanding_urbs: %d\n", __func__,
		portdata->outstanding_urbs);
	spin_unlock_irqrestore(&portdata->lock, flags);

	retval = usb_autopm_get_interface_async(serial->interface);
	if (retval < 0) {
		spin_lock_irqsave(&portdata->lock, flags);
		portdata->outstanding_urbs--;
		spin_unlock_irqrestore(&portdata->lock, flags);
		goto error_simple;
	}

	buffer = kmalloc(writesize, GFP_ATOMIC);
	if (!buffer) {
		dev_err(&port->dev, "out of memory\n");
		retval = -ENOMEM;
		goto error_no_buffer;
	}

	urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!urb) {
		dev_err(&port->dev, "no more free urbs\n");
		retval = -ENOMEM;
		goto error_no_urb;
	}

	memcpy(buffer, buf, writesize);

	usb_serial_debug_data(debug, &port->dev, __func__, writesize, buffer);

	usb_fill_bulk_urb(urb, serial->dev,
			  usb_sndbulkpipe(serial->dev,
					  port->bulk_out_endpointAddress),
			  buffer, writesize, sierra_outdat_callback, port);

	/* Handle the need to send a zero length packet */
	urb->transfer_flags |= URB_ZERO_PACKET;

	spin_lock_irqsave(&intfdata->susp_lock, flags);

	if (intfdata->suspended) {
		usb_anchor_urb(urb, &portdata->delayed);
		spin_unlock_irqrestore(&intfdata->susp_lock, flags);
		goto skip_power;
	} else {
		usb_anchor_urb(urb, &portdata->active);
	}
	/* send it down the pipe */
	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval) {
		usb_unanchor_urb(urb);
		spin_unlock_irqrestore(&intfdata->susp_lock, flags);
		dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
			"with status = %d\n", __func__, retval);
		goto error;
	} else {
		intfdata->in_flight++;
		spin_unlock_irqrestore(&intfdata->susp_lock, flags);
	}

skip_power:
	/* we are done with this urb, so let the host driver
	 * really free it when it is finished with it */
	usb_free_urb(urb);

	return writesize;
error:
	usb_free_urb(urb);
error_no_urb:
	kfree(buffer);
error_no_buffer:
	spin_lock_irqsave(&portdata->lock, flags);
	--portdata->outstanding_urbs;
	dev_dbg(&port->dev, "%s - 2. outstanding_urbs: %d\n", __func__,
		portdata->outstanding_urbs);
	spin_unlock_irqrestore(&portdata->lock, flags);
	usb_autopm_put_interface_async(serial->interface);
error_simple:
	return retval;
}

static void sierra_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;

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

	dev_dbg(&port->dev, "%s: %p\n", __func__, urb);

	if (status) {
		dev_dbg(&port->dev, "%s: nonzero status: %d on"
			" endpoint %02x\n", __func__, status, endpoint);
	} else {
		if (urb->actual_length) {
			tty = tty_port_tty_get(&port->port);
			if (tty) {
				tty_insert_flip_string(tty, data,
					urb->actual_length);
				tty_flip_buffer_push(tty);

				tty_kref_put(tty);
				usb_serial_debug_data(debug, &port->dev,
					__func__, urb->actual_length, data);
			}
		} else {
			dev_dbg(&port->dev, "%s: empty read urb"
				" received\n", __func__);
		}
	}

	/* Resubmit urb so we continue receiving */
	if (status != -ESHUTDOWN && status != -EPERM) {
		usb_mark_last_busy(port->serial->dev);
		err = usb_submit_urb(urb, GFP_ATOMIC);
		if (err && err != -EPERM)
			dev_err(&port->dev, "resubmit read urb failed."
				"(%d)\n", err);
	}
}

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

	dev_dbg(&port->dev, "%s: urb %p port %p has data %p\n", __func__,
		urb, port, portdata);

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

		if (!req_pkt) {
			dev_dbg(&port->dev, "%s: NULL req_pkt\n",
				__func__);
			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));
			struct tty_struct *tty;

			dev_dbg(&port->dev, "%s: signal x%x\n", __func__,
				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);

			tty = tty_port_tty_get(&port->port);
			if (tty && !C_CLOCAL(tty) &&
					old_dcd_state && !portdata->dcd_state)
				tty_hangup(tty);
			tty_kref_put(tty);
		} else {
			dev_dbg(&port->dev, "%s: type %x req %x\n",
				__func__, req_pkt->bRequestType,
				req_pkt->bRequest);
		}
	} else
		dev_dbg(&port->dev, "%s: error %d\n", __func__, status);

	/* Resubmit urb so we continue receiving IRQ data */
	if (status != -ESHUTDOWN && status != -ENOENT) {
		usb_mark_last_busy(serial->dev);
		urb->dev = serial->dev;
		err = usb_submit_urb(urb, GFP_ATOMIC);
		if (err && err != -EPERM)
			dev_err(&port->dev, "%s: resubmit intr urb "
				"failed. (%d)\n", __func__, err);
	}
}

static int sierra_write_room(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct sierra_port_private *portdata = usb_get_serial_port_data(port);
	unsigned long flags;

	dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);

	/* try to give a good number back based on if we have any free urbs at
	 * this point in time */
	spin_lock_irqsave(&portdata->lock, flags);
	if (portdata->outstanding_urbs > (portdata->num_out_urbs * 2) / 3) {
		spin_unlock_irqrestore(&portdata->lock, flags);
		dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
		return 0;
	}
	spin_unlock_irqrestore(&portdata->lock, flags);

	return 2048;
}

static void sierra_stop_rx_urbs(struct usb_serial_port *port)
{
	int i;
	struct sierra_port_private *portdata = usb_get_serial_port_data(port);

	for (i = 0; i < portdata->num_in_urbs; i++)
		usb_kill_urb(portdata->in_urbs[i]);

	usb_kill_urb(port->interrupt_in_urb);
}

static int sierra_submit_rx_urbs(struct usb_serial_port *port, gfp_t mem_flags)
{
	int ok_cnt;
	int err = -EINVAL;
	int i;
	struct urb *urb;
	struct sierra_port_private *portdata = usb_get_serial_port_data(port);

	ok_cnt = 0;
	for (i = 0; i < portdata->num_in_urbs; i++) {
		urb = portdata->in_urbs[i];
		if (!urb)
			continue;
		err = usb_submit_urb(urb, mem_flags);
		if (err) {
			dev_err(&port->dev, "%s: submit urb failed: %d\n",
				__func__, err);
		} else {
			ok_cnt++;
		}
	}

	if (ok_cnt && port->interrupt_in_urb) {
		err = usb_submit_urb(port->interrupt_in_urb, mem_flags);
		if (err) {
			dev_err(&port->dev, "%s: submit intr urb failed: %d\n",
				__func__, err);
		}
	}

	if (ok_cnt > 0) /* at least one rx urb submitted */
		return 0;
	else
		return err;
}

static struct urb *sierra_setup_urb(struct usb_serial *serial, int endpoint,
					int dir, void *ctx, int len,
					gfp_t mem_flags,
					usb_complete_t callback)
{
	struct urb	*urb;
	u8		*buf;

	if (endpoint == -1)
		return NULL;

	urb = usb_alloc_urb(0, mem_flags);
	if (urb == NULL) {
		dev_dbg(&serial->dev->dev, "%s: alloc for endpoint %d failed\n",
			__func__, endpoint);
		return NULL;
	}

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

		/* debug */
		dev_dbg(&serial->dev->dev, "%s %c u : %p d:%p\n", __func__,
				dir == USB_DIR_IN ? 'i' : 'o', urb, buf);
	} else {
		dev_dbg(&serial->dev->dev, "%s %c u:%p d:%p\n", __func__,
				dir == USB_DIR_IN ? 'i' : 'o', urb, buf);

		sierra_release_urb(urb);
		urb = NULL;
	}

	return urb;
}

static void sierra_close(struct usb_serial_port *port)
{
	int i;
	struct usb_serial *serial = port->serial;
	struct sierra_port_private *portdata;
	struct sierra_intf_private *intfdata = port->serial->private;


	dev_dbg(&port->dev, "%s\n", __func__);
	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) {
			serial->interface->needs_remote_wakeup = 0;
			/* odd error handling due to pm counters */
			if (!usb_autopm_get_interface(serial->interface))
				sierra_send_setup(port);
			else
				usb_autopm_get_interface_no_resume(serial->interface);
				
		}
		mutex_unlock(&serial->disc_mutex);
		spin_lock_irq(&intfdata->susp_lock);
		portdata->opened = 0;
		spin_unlock_irq(&intfdata->susp_lock);


		/* Stop reading urbs */
		sierra_stop_rx_urbs(port);
		/* .. and release them */
		for (i = 0; i < portdata->num_in_urbs; i++) {
			sierra_release_urb(portdata->in_urbs[i]);
			portdata->in_urbs[i] = NULL;
		}
	}
}

static int sierra_open(struct tty_struct *tty, struct usb_serial_port *port)
{
	struct sierra_port_private *portdata;
	struct usb_serial *serial = port->serial;
	struct sierra_intf_private *intfdata = serial->private;
	int i;
	int err;
	int endpoint;
	struct urb *urb;

	portdata = usb_get_serial_port_data(port);

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

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


	endpoint = port->bulk_in_endpointAddress;
	for (i = 0; i < portdata->num_in_urbs; i++) {
		urb = sierra_setup_urb(serial, endpoint, USB_DIR_IN, port,
					IN_BUFLEN, GFP_KERNEL,
					sierra_indat_callback);
		portdata->in_urbs[i] = urb;
	}
	/* clear halt condition */
	usb_clear_halt(serial->dev,
			usb_sndbulkpipe(serial->dev, endpoint) | USB_DIR_IN);

	err = sierra_submit_rx_urbs(port, GFP_KERNEL);
	if (err) {
		/* get rid of everything as in close */
		sierra_close(port);
		/* restore balance for autopm */
		if (!serial->disconnected)
			usb_autopm_put_interface(serial->interface);
		return err;
	}
	sierra_send_setup(port);

	serial->interface->needs_remote_wakeup = 1;
	spin_lock_irq(&intfdata->susp_lock);
	portdata->opened = 1;
	spin_unlock_irq(&intfdata->susp_lock);
	usb_autopm_put_interface(serial->interface);

	return 0;
}


static void sierra_dtr_rts(struct usb_serial_port *port, int on)
{
	struct usb_serial *serial = port->serial;
	struct sierra_port_private *portdata;

	portdata = usb_get_serial_port_data(port);
	portdata->rts_state = on;
	portdata->dtr_state = on;

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

static int sierra_startup(struct usb_serial *serial)
{
	struct usb_serial_port *port;
	struct sierra_port_private *portdata;
	struct sierra_iface_info *himemoryp = NULL;
	int i;
	u8 ifnum;

	dev_dbg(&serial->dev->dev, "%s\n", __func__);

	/* Set Device mode to D0 */
	sierra_set_power_state(serial->dev, 0x0000);

	/* Check NMEA and set */
	if (nmea)
		sierra_vsc_set_nmea(serial->dev, 1);

	/* 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) {
			dev_dbg(&port->dev, "%s: kmalloc for "
				"sierra_port_private (%d) failed!\n",
				__func__, i);
			return -ENOMEM;
		}
		spin_lock_init(&portdata->lock);
		init_usb_anchor(&portdata->active);
		init_usb_anchor(&portdata->delayed);
		ifnum = i;
		/* Assume low memory requirements */
		portdata->num_out_urbs = N_OUT_URB;
		portdata->num_in_urbs  = N_IN_URB;

		/* Determine actual memory requirements */
		if (serial->num_ports == 1) {
			/* Get interface number for composite device */
			ifnum = sierra_calc_interface(serial);
			himemoryp =
			    (struct sierra_iface_info *)&typeB_interface_list;
			if (is_himemory(ifnum, himemoryp)) {
				portdata->num_out_urbs = N_OUT_URB_HM;
				portdata->num_in_urbs  = N_IN_URB_HM;
			}
		}
		else {
			himemoryp =
			    (struct sierra_iface_info *)&typeA_interface_list;
			if (is_himemory(i, himemoryp)) {
				portdata->num_out_urbs = N_OUT_URB_HM;
				portdata->num_in_urbs  = N_IN_URB_HM;
			}
		}
		dev_dbg(&serial->dev->dev,
			"Memory usage (urbs) interface #%d, in=%d, out=%d\n",
			ifnum,portdata->num_in_urbs, portdata->num_out_urbs );
		/* Set the port private data pointer */
		usb_set_serial_port_data(port, portdata);
	}

	return 0;
}

static void sierra_release(struct usb_serial *serial)
{
	int i;
	struct usb_serial_port *port;
	struct sierra_port_private *portdata;

	dev_dbg(&serial->dev->dev, "%s\n", __func__);

	for (i = 0; i < serial->num_ports; ++i) {
		port = serial->port[i];
		if (!port)
			continue;
		portdata = usb_get_serial_port_data(port);
		if (!portdata)
			continue;
		kfree(portdata);
	}
}

#ifdef CONFIG_PM
static void stop_read_write_urbs(struct usb_serial *serial)
{
	int i;
	struct usb_serial_port *port;
	struct sierra_port_private *portdata;

	/* Stop reading/writing urbs */
	for (i = 0; i < serial->num_ports; ++i) {
		port = serial->port[i];
		portdata = usb_get_serial_port_data(port);
		sierra_stop_rx_urbs(port);
		usb_kill_anchored_urbs(&portdata->active);
	}
}

static int sierra_suspend(struct usb_serial *serial, pm_message_t message)
{
	struct sierra_intf_private *intfdata;
	int b;

	if (message.event & PM_EVENT_AUTO) {
		intfdata = serial->private;
		spin_lock_irq(&intfdata->susp_lock);
		b = intfdata->in_flight;

		if (b) {
			spin_unlock_irq(&intfdata->susp_lock);
			return -EBUSY;
		} else {
			intfdata->suspended = 1;
			spin_unlock_irq(&intfdata->susp_lock);
		}
	}
	stop_read_write_urbs(serial);

	return 0;
}

static int sierra_resume(struct usb_serial *serial)
{
	struct usb_serial_port *port;
	struct sierra_intf_private *intfdata = serial->private;
	struct sierra_port_private *portdata;
	struct urb *urb;
	int ec = 0;
	int i, err;

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

		while ((urb = usb_get_from_anchor(&portdata->delayed))) {
			usb_anchor_urb(urb, &portdata->active);
			intfdata->in_flight++;
			err = usb_submit_urb(urb, GFP_ATOMIC);
			if (err < 0) {
				intfdata->in_flight--;
				usb_unanchor_urb(urb);
				usb_scuttle_anchored_urbs(&portdata->delayed);
				break;
			}
		}

		if (portdata->opened) {
			err = sierra_submit_rx_urbs(port, GFP_ATOMIC);
			if (err)
				ec++;
		}
	}
	intfdata->suspended = 0;
	spin_unlock_irq(&intfdata->susp_lock);

	return ec ? -EIO : 0;
}

static int sierra_reset_resume(struct usb_interface *intf)
{
	struct usb_serial *serial = usb_get_intfdata(intf);
	dev_err(&serial->dev->dev, "%s\n", __func__);
	return usb_serial_resume(intf);
}
#else
#define sierra_suspend NULL
#define sierra_resume NULL
#define sierra_reset_resume NULL
#endif

static struct usb_driver sierra_driver = {
	.name       = "sierra",
	.probe      = usb_serial_probe,
	.disconnect = usb_serial_disconnect,
	.suspend    = usb_serial_suspend,
	.resume     = usb_serial_resume,
	.reset_resume = sierra_reset_resume,
	.id_table   = id_table,
	.no_dynamic_id = 	1,
	.supports_autosuspend =	1,
};

static struct usb_serial_driver sierra_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"sierra",
	},
	.description       = "Sierra USB modem",
	.id_table          = id_table,
	.usb_driver        = &sierra_driver,
	.calc_num_ports	   = sierra_calc_num_ports,
	.probe		   = sierra_probe,
	.open              = sierra_open,
	.close             = sierra_close,
	.dtr_rts	   = sierra_dtr_rts,
	.write             = sierra_write,
	.write_room        = sierra_write_room,
	.set_termios       = sierra_set_termios,
	.tiocmget          = sierra_tiocmget,
	.tiocmset          = sierra_tiocmset,
	.attach            = sierra_startup,
	.release           = sierra_release,
	.suspend	   = sierra_suspend,
	.resume		   = sierra_resume,
	.read_int_callback = sierra_instat_callback,
};

/* Functions used by new usb-serial code. */
static int __init sierra_init(void)
{
	int retval;
	retval = usb_serial_register(&sierra_device);
	if (retval)
		goto failed_device_register;


	retval = usb_register(&sierra_driver);
	if (retval)
		goto failed_driver_register;

	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
	       DRIVER_DESC "\n");

	return 0;

failed_driver_register:
	usb_serial_deregister(&sierra_device);
failed_device_register:
	return retval;
}

static void __exit sierra_exit(void)
{
	usb_deregister(&sierra_driver);
	usb_serial_deregister(&sierra_device);
}

module_init(sierra_init);
module_exit(sierra_exit);

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

module_param(nmea, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(nmea, "NMEA streaming");

module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug messages");