forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathirda-usb.c
1925 lines (1680 loc) · 58 KB
/
irda-usb.c
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
/*****************************************************************************
*
* Filename: irda-usb.c
* Version: 0.10
* Description: IrDA-USB Driver
* Status: Experimental
* Author: Dag Brattli <[email protected]>
*
* Copyright (C) 2000, Roman Weissgaerber <[email protected]>
* Copyright (C) 2001, Dag Brattli <[email protected]>
* Copyright (C) 2001, Jean Tourrilhes <[email protected]>
* Copyright (C) 2004, SigmaTel, Inc. <[email protected]>
* Copyright (C) 2005, Milan Beno <[email protected]>
* Copyright (C) 2006, Nick Fedchik <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*****************************************************************************/
/*
* IMPORTANT NOTE
* --------------
*
* As of kernel 2.5.20, this is the state of compliance and testing of
* this driver (irda-usb) with regards to the USB low level drivers...
*
* This driver has been tested SUCCESSFULLY with the following drivers :
* o usb-uhci-hcd (For Intel/Via USB controllers)
* o uhci-hcd (Alternate/JE driver for Intel/Via USB controllers)
* o ohci-hcd (For other USB controllers)
*
* This driver has NOT been tested with the following drivers :
* o ehci-hcd (USB 2.0 controllers)
*
* Note that all HCD drivers do URB_ZERO_PACKET and timeout properly,
* so we don't have to worry about that anymore.
* One common problem is the failure to set the address on the dongle,
* but this happens before the driver gets loaded...
*
* Jean II
*/
/*------------------------------------------------------------------*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/rtnetlink.h>
#include <linux/usb.h>
#include <linux/firmware.h>
#include "irda-usb.h"
/*------------------------------------------------------------------*/
static int qos_mtt_bits = 0;
/* These are the currently known IrDA USB dongles. Add new dongles here */
static struct usb_device_id dongles[] = {
/* ACTiSYS Corp., ACT-IR2000U FIR-USB Adapter */
{ USB_DEVICE(0x9c4, 0x011), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
/* Look like ACTiSYS, Report : IBM Corp., IBM UltraPort IrDA */
{ USB_DEVICE(0x4428, 0x012), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
/* KC Technology Inc., KC-180 USB IrDA Device */
{ USB_DEVICE(0x50f, 0x180), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
/* Extended Systems, Inc., XTNDAccess IrDA USB (ESI-9685) */
{ USB_DEVICE(0x8e9, 0x100), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
/* SigmaTel STIR4210/4220/4116 USB IrDA (VFIR) Bridge */
{ USB_DEVICE(0x66f, 0x4210), .driver_info = IUC_STIR421X | IUC_SPEED_BUG },
{ USB_DEVICE(0x66f, 0x4220), .driver_info = IUC_STIR421X | IUC_SPEED_BUG },
{ USB_DEVICE(0x66f, 0x4116), .driver_info = IUC_STIR421X | IUC_SPEED_BUG },
{ .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS |
USB_DEVICE_ID_MATCH_INT_SUBCLASS,
.bInterfaceClass = USB_CLASS_APP_SPEC,
.bInterfaceSubClass = USB_CLASS_IRDA,
.driver_info = IUC_DEFAULT, },
{ }, /* The end */
};
/*
* Important note :
* Devices based on the SigmaTel chipset (0x66f, 0x4200) are not designed
* using the "USB-IrDA specification" (yes, there exist such a thing), and
* therefore not supported by this driver (don't add them above).
* There is a Linux driver, stir4200, that support those USB devices.
* Jean II
*/
MODULE_DEVICE_TABLE(usb, dongles);
/*------------------------------------------------------------------*/
static void irda_usb_init_qos(struct irda_usb_cb *self) ;
static struct irda_class_desc *irda_usb_find_class_desc(struct usb_interface *intf);
static void irda_usb_disconnect(struct usb_interface *intf);
static void irda_usb_change_speed_xbofs(struct irda_usb_cb *self);
static netdev_tx_t irda_usb_hard_xmit(struct sk_buff *skb,
struct net_device *dev);
static int irda_usb_open(struct irda_usb_cb *self);
static void irda_usb_close(struct irda_usb_cb *self);
static void speed_bulk_callback(struct urb *urb);
static void write_bulk_callback(struct urb *urb);
static void irda_usb_receive(struct urb *urb);
static void irda_usb_rx_defer_expired(unsigned long data);
static int irda_usb_net_open(struct net_device *dev);
static int irda_usb_net_close(struct net_device *dev);
static int irda_usb_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
static void irda_usb_net_timeout(struct net_device *dev);
/************************ TRANSMIT ROUTINES ************************/
/*
* Receive packets from the IrDA stack and send them on the USB pipe.
* Handle speed change, timeout and lot's of ugliness...
*/
/*------------------------------------------------------------------*/
/*
* Function irda_usb_build_header(self, skb, header)
*
* Builds USB-IrDA outbound header
*
* When we send an IrDA frame over an USB pipe, we add to it a 1 byte
* header. This function create this header with the proper values.
*
* Important note : the USB-IrDA spec 1.0 say very clearly in chapter 5.4.2.2
* that the setting of the link speed and xbof number in this outbound header
* should be applied *AFTER* the frame has been sent.
* Unfortunately, some devices are not compliant with that... It seems that
* reading the spec is far too difficult...
* Jean II
*/
static void irda_usb_build_header(struct irda_usb_cb *self,
__u8 *header,
int force)
{
/* Here we check if we have an STIR421x chip,
* and if either speed or xbofs (or both) needs
* to be changed.
*/
if (self->capability & IUC_STIR421X &&
((self->new_speed != -1) || (self->new_xbofs != -1))) {
/* With STIR421x, speed and xBOFs must be set at the same
* time, even if only one of them changes.
*/
if (self->new_speed == -1)
self->new_speed = self->speed ;
if (self->new_xbofs == -1)
self->new_xbofs = self->xbofs ;
}
/* Set the link speed */
if (self->new_speed != -1) {
/* Hum... Ugly hack :-(
* Some device are not compliant with the spec and change
* parameters *before* sending the frame. - Jean II
*/
if ((self->capability & IUC_SPEED_BUG) &&
(!force) && (self->speed != -1)) {
/* No speed and xbofs change here
* (we'll do it later in the write callback) */
IRDA_DEBUG(2, "%s(), not changing speed yet\n", __func__);
*header = 0;
return;
}
IRDA_DEBUG(2, "%s(), changing speed to %d\n", __func__, self->new_speed);
self->speed = self->new_speed;
/* We will do ` self->new_speed = -1; ' in the completion
* handler just in case the current URB fail - Jean II */
switch (self->speed) {
case 2400:
*header = SPEED_2400;
break;
default:
case 9600:
*header = SPEED_9600;
break;
case 19200:
*header = SPEED_19200;
break;
case 38400:
*header = SPEED_38400;
break;
case 57600:
*header = SPEED_57600;
break;
case 115200:
*header = SPEED_115200;
break;
case 576000:
*header = SPEED_576000;
break;
case 1152000:
*header = SPEED_1152000;
break;
case 4000000:
*header = SPEED_4000000;
self->new_xbofs = 0;
break;
case 16000000:
*header = SPEED_16000000;
self->new_xbofs = 0;
break;
}
} else
/* No change */
*header = 0;
/* Set the negotiated additional XBOFS */
if (self->new_xbofs != -1) {
IRDA_DEBUG(2, "%s(), changing xbofs to %d\n", __func__, self->new_xbofs);
self->xbofs = self->new_xbofs;
/* We will do ` self->new_xbofs = -1; ' in the completion
* handler just in case the current URB fail - Jean II */
switch (self->xbofs) {
case 48:
*header |= 0x10;
break;
case 28:
case 24: /* USB spec 1.0 says 24 */
*header |= 0x20;
break;
default:
case 12:
*header |= 0x30;
break;
case 5: /* Bug in IrLAP spec? (should be 6) */
case 6:
*header |= 0x40;
break;
case 3:
*header |= 0x50;
break;
case 2:
*header |= 0x60;
break;
case 1:
*header |= 0x70;
break;
case 0:
*header |= 0x80;
break;
}
}
}
/*
* calculate turnaround time for SigmaTel header
*/
static __u8 get_turnaround_time(struct sk_buff *skb)
{
int turnaround_time = irda_get_mtt(skb);
if ( turnaround_time == 0 )
return 0;
else if ( turnaround_time <= 10 )
return 1;
else if ( turnaround_time <= 50 )
return 2;
else if ( turnaround_time <= 100 )
return 3;
else if ( turnaround_time <= 500 )
return 4;
else if ( turnaround_time <= 1000 )
return 5;
else if ( turnaround_time <= 5000 )
return 6;
else
return 7;
}
/*------------------------------------------------------------------*/
/*
* Send a command to change the speed of the dongle
* Need to be called with spinlock on.
*/
static void irda_usb_change_speed_xbofs(struct irda_usb_cb *self)
{
__u8 *frame;
struct urb *urb;
int ret;
IRDA_DEBUG(2, "%s(), speed=%d, xbofs=%d\n", __func__,
self->new_speed, self->new_xbofs);
/* Grab the speed URB */
urb = self->speed_urb;
if (urb->status != 0) {
IRDA_WARNING("%s(), URB still in use!\n", __func__);
return;
}
/* Allocate the fake frame */
frame = self->speed_buff;
/* Set the new speed and xbofs in this fake frame */
irda_usb_build_header(self, frame, 1);
if (self->capability & IUC_STIR421X) {
if (frame[0] == 0) return ; // do nothing if no change
frame[1] = 0; // other parameters don't change here
frame[2] = 0;
}
/* Submit the 0 length IrDA frame to trigger new speed settings */
usb_fill_bulk_urb(urb, self->usbdev,
usb_sndbulkpipe(self->usbdev, self->bulk_out_ep),
frame, IRDA_USB_SPEED_MTU,
speed_bulk_callback, self);
urb->transfer_buffer_length = self->header_length;
urb->transfer_flags = 0;
/* Irq disabled -> GFP_ATOMIC */
if ((ret = usb_submit_urb(urb, GFP_ATOMIC))) {
IRDA_WARNING("%s(), failed Speed URB\n", __func__);
}
}
/*------------------------------------------------------------------*/
/*
* Speed URB callback
* Now, we can only get called for the speed URB.
*/
static void speed_bulk_callback(struct urb *urb)
{
struct irda_usb_cb *self = urb->context;
IRDA_DEBUG(2, "%s()\n", __func__);
/* We should always have a context */
IRDA_ASSERT(self != NULL, return;);
/* We should always be called for the speed URB */
IRDA_ASSERT(urb == self->speed_urb, return;);
/* Check for timeout and other USB nasties */
if (urb->status != 0) {
/* I get a lot of -ECONNABORTED = -103 here - Jean II */
IRDA_DEBUG(0, "%s(), URB complete status %d, transfer_flags 0x%04X\n", __func__, urb->status, urb->transfer_flags);
/* Don't do anything here, that might confuse the USB layer.
* Instead, we will wait for irda_usb_net_timeout(), the
* network layer watchdog, to fix the situation.
* Jean II */
/* A reset of the dongle might be welcomed here - Jean II */
return;
}
/* urb is now available */
//urb->status = 0; -> tested above
/* New speed and xbof is now committed in hardware */
self->new_speed = -1;
self->new_xbofs = -1;
/* Allow the stack to send more packets */
netif_wake_queue(self->netdev);
}
/*------------------------------------------------------------------*/
/*
* Send an IrDA frame to the USB dongle (for transmission)
*/
static netdev_tx_t irda_usb_hard_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct irda_usb_cb *self = netdev_priv(netdev);
struct urb *urb = self->tx_urb;
unsigned long flags;
s32 speed;
s16 xbofs;
int res, mtt;
IRDA_DEBUG(4, "%s() on %s\n", __func__, netdev->name);
netif_stop_queue(netdev);
/* Protect us from USB callbacks, net watchdog and else. */
spin_lock_irqsave(&self->lock, flags);
/* Check if the device is still there.
* We need to check self->present under the spinlock because
* of irda_usb_disconnect() is synchronous - Jean II */
if (!self->present) {
IRDA_DEBUG(0, "%s(), Device is gone...\n", __func__);
goto drop;
}
/* Check if we need to change the number of xbofs */
xbofs = irda_get_next_xbofs(skb);
if ((xbofs != self->xbofs) && (xbofs != -1)) {
self->new_xbofs = xbofs;
}
/* Check if we need to change the speed */
speed = irda_get_next_speed(skb);
if ((speed != self->speed) && (speed != -1)) {
/* Set the desired speed */
self->new_speed = speed;
/* Check for empty frame */
if (!skb->len) {
/* IrLAP send us an empty frame to make us change the
* speed. Changing speed with the USB adapter is in
* fact sending an empty frame to the adapter, so we
* could just let the present function do its job.
* However, we would wait for min turn time,
* do an extra memcpy and increment packet counters...
* Jean II */
irda_usb_change_speed_xbofs(self);
netdev->trans_start = jiffies;
/* Will netif_wake_queue() in callback */
goto drop;
}
}
if (urb->status != 0) {
IRDA_WARNING("%s(), URB still in use!\n", __func__);
goto drop;
}
skb_copy_from_linear_data(skb, self->tx_buff + self->header_length, skb->len);
/* Change setting for next frame */
if (self->capability & IUC_STIR421X) {
__u8 turnaround_time;
__u8* frame = self->tx_buff;
turnaround_time = get_turnaround_time( skb );
irda_usb_build_header(self, frame, 0);
frame[2] = turnaround_time;
if ((skb->len != 0) &&
((skb->len % 128) == 0) &&
((skb->len % 512) != 0)) {
/* add extra byte for special SigmaTel feature */
frame[1] = 1;
skb_put(skb, 1);
} else {
frame[1] = 0;
}
} else {
irda_usb_build_header(self, self->tx_buff, 0);
}
/* FIXME: Make macro out of this one */
((struct irda_skb_cb *)skb->cb)->context = self;
usb_fill_bulk_urb(urb, self->usbdev,
usb_sndbulkpipe(self->usbdev, self->bulk_out_ep),
self->tx_buff, skb->len + self->header_length,
write_bulk_callback, skb);
/* This flag (URB_ZERO_PACKET) indicates that what we send is not
* a continuous stream of data but separate packets.
* In this case, the USB layer will insert an empty USB frame (TD)
* after each of our packets that is exact multiple of the frame size.
* This is how the dongle will detect the end of packet - Jean II */
urb->transfer_flags = URB_ZERO_PACKET;
/* Generate min turn time. FIXME: can we do better than this? */
/* Trying to a turnaround time at this level is trying to measure
* processor clock cycle with a wrist-watch, approximate at best...
*
* What we know is the last time we received a frame over USB.
* Due to latency over USB that depend on the USB load, we don't
* know when this frame was received over IrDA (a few ms before ?)
* Then, same story for our outgoing frame...
*
* In theory, the USB dongle is supposed to handle the turnaround
* by itself (spec 1.0, chater 4, page 6). Who knows ??? That's
* why this code is enabled only for dongles that doesn't meet
* the spec.
* Jean II */
if (self->capability & IUC_NO_TURN) {
mtt = irda_get_mtt(skb);
if (mtt) {
int diff;
do_gettimeofday(&self->now);
diff = self->now.tv_usec - self->stamp.tv_usec;
#ifdef IU_USB_MIN_RTT
/* Factor in USB delays -> Get rid of udelay() that
* would be lost in the noise - Jean II */
diff += IU_USB_MIN_RTT;
#endif /* IU_USB_MIN_RTT */
/* If the usec counter did wraparound, the diff will
* go negative (tv_usec is a long), so we need to
* correct it by one second. Jean II */
if (diff < 0)
diff += 1000000;
/* Check if the mtt is larger than the time we have
* already used by all the protocol processing
*/
if (mtt > diff) {
mtt -= diff;
if (mtt > 1000)
mdelay(mtt/1000);
else
udelay(mtt);
}
}
}
/* Ask USB to send the packet - Irq disabled -> GFP_ATOMIC */
if ((res = usb_submit_urb(urb, GFP_ATOMIC))) {
IRDA_WARNING("%s(), failed Tx URB\n", __func__);
netdev->stats.tx_errors++;
/* Let USB recover : We will catch that in the watchdog */
/*netif_start_queue(netdev);*/
} else {
/* Increment packet stats */
netdev->stats.tx_packets++;
netdev->stats.tx_bytes += skb->len;
netdev->trans_start = jiffies;
}
spin_unlock_irqrestore(&self->lock, flags);
return NETDEV_TX_OK;
drop:
/* Drop silently the skb and exit */
dev_kfree_skb(skb);
spin_unlock_irqrestore(&self->lock, flags);
return NETDEV_TX_OK;
}
/*------------------------------------------------------------------*/
/*
* Note : this function will be called only for tx_urb...
*/
static void write_bulk_callback(struct urb *urb)
{
unsigned long flags;
struct sk_buff *skb = urb->context;
struct irda_usb_cb *self = ((struct irda_skb_cb *) skb->cb)->context;
IRDA_DEBUG(2, "%s()\n", __func__);
/* We should always have a context */
IRDA_ASSERT(self != NULL, return;);
/* We should always be called for the speed URB */
IRDA_ASSERT(urb == self->tx_urb, return;);
/* Free up the skb */
dev_kfree_skb_any(skb);
urb->context = NULL;
/* Check for timeout and other USB nasties */
if (urb->status != 0) {
/* I get a lot of -ECONNABORTED = -103 here - Jean II */
IRDA_DEBUG(0, "%s(), URB complete status %d, transfer_flags 0x%04X\n", __func__, urb->status, urb->transfer_flags);
/* Don't do anything here, that might confuse the USB layer,
* and we could go in recursion and blow the kernel stack...
* Instead, we will wait for irda_usb_net_timeout(), the
* network layer watchdog, to fix the situation.
* Jean II */
/* A reset of the dongle might be welcomed here - Jean II */
return;
}
/* urb is now available */
//urb->status = 0; -> tested above
/* Make sure we read self->present properly */
spin_lock_irqsave(&self->lock, flags);
/* If the network is closed, stop everything */
if ((!self->netopen) || (!self->present)) {
IRDA_DEBUG(0, "%s(), Network is gone...\n", __func__);
spin_unlock_irqrestore(&self->lock, flags);
return;
}
/* If changes to speed or xbofs is pending... */
if ((self->new_speed != -1) || (self->new_xbofs != -1)) {
if ((self->new_speed != self->speed) ||
(self->new_xbofs != self->xbofs)) {
/* We haven't changed speed yet (because of
* IUC_SPEED_BUG), so do it now - Jean II */
IRDA_DEBUG(1, "%s(), Changing speed now...\n", __func__);
irda_usb_change_speed_xbofs(self);
} else {
/* New speed and xbof is now committed in hardware */
self->new_speed = -1;
self->new_xbofs = -1;
/* Done, waiting for next packet */
netif_wake_queue(self->netdev);
}
} else {
/* Otherwise, allow the stack to send more packets */
netif_wake_queue(self->netdev);
}
spin_unlock_irqrestore(&self->lock, flags);
}
/*------------------------------------------------------------------*/
/*
* Watchdog timer from the network layer.
* After a predetermined timeout, if we don't give confirmation that
* the packet has been sent (i.e. no call to netif_wake_queue()),
* the network layer will call this function.
* Note that URB that we submit have also a timeout. When the URB timeout
* expire, the normal URB callback is called (write_bulk_callback()).
*/
static void irda_usb_net_timeout(struct net_device *netdev)
{
unsigned long flags;
struct irda_usb_cb *self = netdev_priv(netdev);
struct urb *urb;
int done = 0; /* If we have made any progress */
IRDA_DEBUG(0, "%s(), Network layer thinks we timed out!\n", __func__);
IRDA_ASSERT(self != NULL, return;);
/* Protect us from USB callbacks, net Tx and else. */
spin_lock_irqsave(&self->lock, flags);
/* self->present *MUST* be read under spinlock */
if (!self->present) {
IRDA_WARNING("%s(), device not present!\n", __func__);
netif_stop_queue(netdev);
spin_unlock_irqrestore(&self->lock, flags);
return;
}
/* Check speed URB */
urb = self->speed_urb;
if (urb->status != 0) {
IRDA_DEBUG(0, "%s: Speed change timed out, urb->status=%d, urb->transfer_flags=0x%04X\n", netdev->name, urb->status, urb->transfer_flags);
switch (urb->status) {
case -EINPROGRESS:
usb_unlink_urb(urb);
/* Note : above will *NOT* call netif_wake_queue()
* in completion handler, we will come back here.
* Jean II */
done = 1;
break;
case -ECONNRESET:
case -ENOENT: /* urb unlinked by us */
default: /* ??? - Play safe */
urb->status = 0;
netif_wake_queue(self->netdev);
done = 1;
break;
}
}
/* Check Tx URB */
urb = self->tx_urb;
if (urb->status != 0) {
struct sk_buff *skb = urb->context;
IRDA_DEBUG(0, "%s: Tx timed out, urb->status=%d, urb->transfer_flags=0x%04X\n", netdev->name, urb->status, urb->transfer_flags);
/* Increase error count */
netdev->stats.tx_errors++;
#ifdef IU_BUG_KICK_TIMEOUT
/* Can't be a bad idea to reset the speed ;-) - Jean II */
if(self->new_speed == -1)
self->new_speed = self->speed;
if(self->new_xbofs == -1)
self->new_xbofs = self->xbofs;
irda_usb_change_speed_xbofs(self);
#endif /* IU_BUG_KICK_TIMEOUT */
switch (urb->status) {
case -EINPROGRESS:
usb_unlink_urb(urb);
/* Note : above will *NOT* call netif_wake_queue()
* in completion handler, because urb->status will
* be -ENOENT. We will fix that at the next watchdog,
* leaving more time to USB to recover...
* Jean II */
done = 1;
break;
case -ECONNRESET:
case -ENOENT: /* urb unlinked by us */
default: /* ??? - Play safe */
if(skb != NULL) {
dev_kfree_skb_any(skb);
urb->context = NULL;
}
urb->status = 0;
netif_wake_queue(self->netdev);
done = 1;
break;
}
}
spin_unlock_irqrestore(&self->lock, flags);
/* Maybe we need a reset */
/* Note : Some drivers seem to use a usb_set_interface() when they
* need to reset the hardware. Hum...
*/
/* if(done == 0) */
}
/************************* RECEIVE ROUTINES *************************/
/*
* Receive packets from the USB layer stack and pass them to the IrDA stack.
* Try to work around USB failures...
*/
/*
* Note :
* Some of you may have noticed that most dongle have an interrupt in pipe
* that we don't use. Here is the little secret...
* When we hang a Rx URB on the bulk in pipe, it generates some USB traffic
* in every USB frame. This is unnecessary overhead.
* The interrupt in pipe will generate an event every time a packet is
* received. Reading an interrupt pipe adds minimal overhead, but has some
* latency (~1ms).
* If we are connected (speed != 9600), we want to minimise latency, so
* we just always hang the Rx URB and ignore the interrupt.
* If we are not connected (speed == 9600), there is usually no Rx traffic,
* and we want to minimise the USB overhead. In this case we should wait
* on the interrupt pipe and hang the Rx URB only when an interrupt is
* received.
* Jean II
*
* Note : don't read the above as what we are currently doing, but as
* something we could do with KC dongle. Also don't forget that the
* interrupt pipe is not part of the original standard, so this would
* need to be optional...
* Jean II
*/
/*------------------------------------------------------------------*/
/*
* Submit a Rx URB to the USB layer to handle reception of a frame
* Mostly called by the completion callback of the previous URB.
*
* Jean II
*/
static void irda_usb_submit(struct irda_usb_cb *self, struct sk_buff *skb, struct urb *urb)
{
struct irda_skb_cb *cb;
int ret;
IRDA_DEBUG(2, "%s()\n", __func__);
/* This should never happen */
IRDA_ASSERT(skb != NULL, return;);
IRDA_ASSERT(urb != NULL, return;);
/* Save ourselves in the skb */
cb = (struct irda_skb_cb *) skb->cb;
cb->context = self;
/* Reinitialize URB */
usb_fill_bulk_urb(urb, self->usbdev,
usb_rcvbulkpipe(self->usbdev, self->bulk_in_ep),
skb->data, IRDA_SKB_MAX_MTU,
irda_usb_receive, skb);
urb->status = 0;
/* Can be called from irda_usb_receive (irq handler) -> GFP_ATOMIC */
ret = usb_submit_urb(urb, GFP_ATOMIC);
if (ret) {
/* If this ever happen, we are in deep s***.
* Basically, the Rx path will stop... */
IRDA_WARNING("%s(), Failed to submit Rx URB %d\n",
__func__, ret);
}
}
/*------------------------------------------------------------------*/
/*
* Function irda_usb_receive(urb)
*
* Called by the USB subsystem when a frame has been received
*
*/
static void irda_usb_receive(struct urb *urb)
{
struct sk_buff *skb = (struct sk_buff *) urb->context;
struct irda_usb_cb *self;
struct irda_skb_cb *cb;
struct sk_buff *newskb;
struct sk_buff *dataskb;
struct urb *next_urb;
unsigned int len, docopy;
IRDA_DEBUG(2, "%s(), len=%d\n", __func__, urb->actual_length);
/* Find ourselves */
cb = (struct irda_skb_cb *) skb->cb;
IRDA_ASSERT(cb != NULL, return;);
self = (struct irda_usb_cb *) cb->context;
IRDA_ASSERT(self != NULL, return;);
/* If the network is closed or the device gone, stop everything */
if ((!self->netopen) || (!self->present)) {
IRDA_DEBUG(0, "%s(), Network is gone!\n", __func__);
/* Don't re-submit the URB : will stall the Rx path */
return;
}
/* Check the status */
if (urb->status != 0) {
switch (urb->status) {
case -EILSEQ:
self->netdev->stats.rx_crc_errors++;
/* Also precursor to a hot-unplug on UHCI. */
/* Fallthrough... */
case -ECONNRESET:
/* Random error, if I remember correctly */
/* uhci_cleanup_unlink() is going to kill the Rx
* URB just after we return. No problem, at this
* point the URB will be idle ;-) - Jean II */
case -ESHUTDOWN:
/* That's usually a hot-unplug. Submit will fail... */
case -ETIME:
/* Usually precursor to a hot-unplug on OHCI. */
default:
self->netdev->stats.rx_errors++;
IRDA_DEBUG(0, "%s(), RX status %d, transfer_flags 0x%04X\n", __func__, urb->status, urb->transfer_flags);
break;
}
/* If we received an error, we don't want to resubmit the
* Rx URB straight away but to give the USB layer a little
* bit of breathing room.
* We are in the USB thread context, therefore there is a
* danger of recursion (new URB we submit fails, we come
* back here).
* With recent USB stack (2.6.15+), I'm seeing that on
* hot unplug of the dongle...
* Lowest effective timer is 10ms...
* Jean II */
self->rx_defer_timer.function = irda_usb_rx_defer_expired;
self->rx_defer_timer.data = (unsigned long) urb;
mod_timer(&self->rx_defer_timer, jiffies + (10 * HZ / 1000));
return;
}
/* Check for empty frames */
if (urb->actual_length <= self->header_length) {
IRDA_WARNING("%s(), empty frame!\n", __func__);
goto done;
}
/*
* Remember the time we received this frame, so we can
* reduce the min turn time a bit since we will know
* how much time we have used for protocol processing
*/
do_gettimeofday(&self->stamp);
/* Check if we need to copy the data to a new skb or not.
* For most frames, we use ZeroCopy and pass the already
* allocated skb up the stack.
* If the frame is small, it is more efficient to copy it
* to save memory (copy will be fast anyway - that's
* called Rx-copy-break). Jean II */
docopy = (urb->actual_length < IRDA_RX_COPY_THRESHOLD);
/* Allocate a new skb */
if (self->capability & IUC_STIR421X)
newskb = dev_alloc_skb(docopy ? urb->actual_length :
IRDA_SKB_MAX_MTU +
USB_IRDA_STIR421X_HEADER);
else
newskb = dev_alloc_skb(docopy ? urb->actual_length :
IRDA_SKB_MAX_MTU);
if (!newskb) {
self->netdev->stats.rx_dropped++;
/* We could deliver the current skb, but this would stall
* the Rx path. Better drop the packet... Jean II */
goto done;
}
/* Make sure IP header get aligned (IrDA header is 5 bytes) */
/* But IrDA-USB header is 1 byte. Jean II */
//skb_reserve(newskb, USB_IRDA_HEADER - 1);
if(docopy) {
/* Copy packet, so we can recycle the original */
skb_copy_from_linear_data(skb, newskb->data, urb->actual_length);
/* Deliver this new skb */
dataskb = newskb;
/* And hook the old skb to the URB
* Note : we don't need to "clean up" the old skb,
* as we never touched it. Jean II */
} else {
/* We are using ZeroCopy. Deliver old skb */
dataskb = skb;
/* And hook the new skb to the URB */
skb = newskb;
}
/* Set proper length on skb & remove USB-IrDA header */
skb_put(dataskb, urb->actual_length);
skb_pull(dataskb, self->header_length);
/* Ask the networking layer to queue the packet for the IrDA stack */
dataskb->dev = self->netdev;
skb_reset_mac_header(dataskb);
dataskb->protocol = htons(ETH_P_IRDA);
len = dataskb->len;
netif_rx(dataskb);
/* Keep stats up to date */
self->netdev->stats.rx_bytes += len;
self->netdev->stats.rx_packets++;
done:
/* Note : at this point, the URB we've just received (urb)
* is still referenced by the USB layer. For example, if we
* have received a -ECONNRESET, uhci_cleanup_unlink() will
* continue to process it (in fact, cleaning it up).
* If we were to submit this URB, disaster would ensue.
* Therefore, we submit our idle URB, and put this URB in our
* idle slot....
* Jean II */
/* Note : with this scheme, we could submit the idle URB before
* processing the Rx URB. I don't think it would buy us anything as
* we are running in the USB thread context. Jean II */
next_urb = self->idle_rx_urb;
/* Recycle Rx URB : Now, the idle URB is the present one */
urb->context = NULL;
self->idle_rx_urb = urb;
/* Submit the idle URB to replace the URB we've just received.
* Do it last to avoid race conditions... Jean II */
irda_usb_submit(self, skb, next_urb);
}
/*------------------------------------------------------------------*/
/*
* In case of errors, we want the USB layer to have time to recover.
* Now, it is time to resubmit ouur Rx URB...
*/
static void irda_usb_rx_defer_expired(unsigned long data)
{
struct urb *urb = (struct urb *) data;
struct sk_buff *skb = (struct sk_buff *) urb->context;
struct irda_usb_cb *self;
struct irda_skb_cb *cb;
struct urb *next_urb;
IRDA_DEBUG(2, "%s()\n", __func__);
/* Find ourselves */
cb = (struct irda_skb_cb *) skb->cb;
IRDA_ASSERT(cb != NULL, return;);
self = (struct irda_usb_cb *) cb->context;
IRDA_ASSERT(self != NULL, return;);
/* Same stuff as when Rx is done, see above... */
next_urb = self->idle_rx_urb;
urb->context = NULL;
self->idle_rx_urb = urb;
irda_usb_submit(self, skb, next_urb);
}
/*------------------------------------------------------------------*/
/*
* Callbak from IrDA layer. IrDA wants to know if we have
* started receiving anything.
*/
static int irda_usb_is_receiving(struct irda_usb_cb *self)
{
/* Note : because of the way UHCI works, it's almost impossible
* to get this info. The Controller DMA directly to memory and
* signal only when the whole frame is finished. To know if the
* first TD of the URB has been filled or not seems hard work...
*
* The other solution would be to use the "receiving" command
* on the default decriptor with a usb_control_msg(), but that
* would add USB traffic and would return result only in the
* next USB frame (~1ms).
*
* I've been told that current dongles send status info on their
* interrupt endpoint, and that's what the Windows driver uses