aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/p54/p54usb.c
blob: 17e199546eebca34e7089e93382739005e7241fc (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

/*
 * Linux device driver for USB based Prism54
 *
 * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
 *
 * Based on the islsm (softmac prism54) driver, which is:
 * Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/usb.h>
#include <linux/pci.h>
#include <linux/firmware.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/crc32.h>
#include <net/mac80211.h>

#include "p54.h"
#include "lmac.h"
#include "p54usb.h"

MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
MODULE_DESCRIPTION("Prism54 USB wireless driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("prism54usb");
MODULE_FIRMWARE("isl3886usb");
MODULE_FIRMWARE("isl3887usb");

static struct usb_device_id p54u_table[] __devinitdata = {
	/* Version 1 devices (pci chip + net2280) */
	{USB_DEVICE(0x0506, 0x0a11)},	/* 3COM 3CRWE254G72 */
	{USB_DEVICE(0x0707, 0xee06)},	/* SMC 2862W-G */
	{USB_DEVICE(0x083a, 0x4501)},	/* Accton 802.11g WN4501 USB */
	{USB_DEVICE(0x083a, 0x4502)},	/* Siemens Gigaset USB Adapter */
	{USB_DEVICE(0x083a, 0x5501)},	/* Phillips CPWUA054 */
	{USB_DEVICE(0x0846, 0x4200)},	/* Netgear WG121 */
	{USB_DEVICE(0x0846, 0x4210)},	/* Netgear WG121 the second ? */
	{USB_DEVICE(0x0846, 0x4220)},	/* Netgear WG111 */
	{USB_DEVICE(0x09aa, 0x1000)},	/* Spinnaker Proto board */
	{USB_DEVICE(0x0cde, 0x0006)},	/* Medion 40900, Roper Europe */
	{USB_DEVICE(0x124a, 0x4023)},	/* Shuttle PN15, Airvast WM168g, IOGear GWU513 */
	{USB_DEVICE(0x1915, 0x2234)},	/* Linksys WUSB54G OEM */
	{USB_DEVICE(0x1915, 0x2235)},	/* Linksys WUSB54G Portable OEM */
	{USB_DEVICE(0x2001, 0x3701)},	/* DLink DWL-G120 Spinnaker */
	{USB_DEVICE(0x2001, 0x3703)},	/* DLink DWL-G122 */
	{USB_DEVICE(0x5041, 0x2234)},	/* Linksys WUSB54G */
	{USB_DEVICE(0x5041, 0x2235)},	/* Linksys WUSB54G Portable */

	/* Version 2 devices (3887) */
	{USB_DEVICE(0x0471, 0x1230)},   /* Philips CPWUA054/00 */
	{USB_DEVICE(0x050d, 0x7050)},	/* Belkin F5D7050 ver 1000 */
	{USB_DEVICE(0x0572, 0x2000)},	/* Cohiba Proto board */
	{USB_DEVICE(0x0572, 0x2002)},	/* Cohiba Proto board */
	{USB_DEVICE(0x06b9, 0x0121)},	/* Thomson SpeedTouch 121g */
	{USB_DEVICE(0x0707, 0xee13)},   /* SMC 2862W-G version 2 */
	{USB_DEVICE(0x083a, 0x4521)},   /* Siemens Gigaset USB Adapter 54 version 2 */
	{USB_DEVICE(0x0846, 0x4240)},	/* Netgear WG111 (v2) */
	{USB_DEVICE(0x0915, 0x2000)},	/* Cohiba Proto board */
	{USB_DEVICE(0x0915, 0x2002)},	/* Cohiba Proto board */
	{USB_DEVICE(0x0baf, 0x0118)},   /* U.S. Robotics U5 802.11g Adapter*/
	{USB_DEVICE(0x0bf8, 0x1009)},   /* FUJITSU E-5400 USB D1700*/
	{USB_DEVICE(0x0cde, 0x0006)},   /* Medion MD40900 */
	{USB_DEVICE(0x0cde, 0x0008)},	/* Sagem XG703A */
	{USB_DEVICE(0x0cde, 0x0015)},	/* Zcomax XG-705A */
	{USB_DEVICE(0x0d8e, 0x3762)},	/* DLink DWL-G120 Cohiba */
	{USB_DEVICE(0x124a, 0x4025)},	/* IOGear GWU513 (GW3887IK chip) */
	{USB_DEVICE(0x1260, 0xee22)},	/* SMC 2862W-G version 2 */
	{USB_DEVICE(0x13b1, 0x000a)},	/* Linksys WUSB54G ver 2 */
	{USB_DEVICE(0x13B1, 0x000C)},	/* Linksys WUSB54AG */
	{USB_DEVICE(0x1413, 0x5400)},   /* Telsey 802.11g USB2.0 Adapter */
	{USB_DEVICE(0x1435, 0x0427)},	/* Inventel UR054G */
	{USB_DEVICE(0x2001, 0x3704)},	/* DLink DWL-G122 rev A2 */
	{USB_DEVICE(0x413c, 0x8102)},	/* Spinnaker DUT */
	{USB_DEVICE(0x413c, 0x8104)},	/* Cohiba Proto board */
	{}
};

MODULE_DEVICE_TABLE(usb, p54u_table);

static const struct {
	u32 intf;
	enum p54u_hw_type type;
	const char *fw;
	const char *fw_legacy;
	char hw[20];
} p54u_fwlist[__NUM_P54U_HWTYPES] = {
	{
		.type = P54U_NET2280,
		.intf = FW_LM86,
		.fw = "isl3886usb",
		.fw_legacy = "isl3890usb",
		.hw = "ISL3886 + net2280",
	},
	{
		.type = P54U_3887,
		.intf = FW_LM87,
		.fw = "isl3887usb",
		.fw_legacy = "isl3887usb_bare",
		.hw = "ISL3887",
	},
};

static void p54u_rx_cb(struct urb *urb)
{
	struct sk_buff *skb = (struct sk_buff *) urb->context;
	struct p54u_rx_info *info = (struct p54u_rx_info *)skb->cb;
	struct ieee80211_hw *dev = info->dev;
	struct p54u_priv *priv = dev->priv;

	skb_unlink(skb, &priv->rx_queue);

	if (unlikely(urb->status)) {
		dev_kfree_skb_irq(skb);
		return;
	}

	skb_put(skb, urb->actual_length);

	if (priv->hw_type == P54U_NET2280)
		skb_pull(skb, priv->common.tx_hdr_len);
	if (priv->common.fw_interface == FW_LM87) {
		skb_pull(skb, 4);
		skb_put(skb, 4);
	}

	if (p54_rx(dev, skb)) {
		skb = dev_alloc_skb(priv->common.rx_mtu + 32);
		if (unlikely(!skb)) {
			/* TODO check rx queue length and refill *somewhere* */
			return;
		}

		info = (struct p54u_rx_info *) skb->cb;
		info->urb = urb;
		info->dev = dev;
		urb->transfer_buffer = skb_tail_pointer(skb);
		urb->context = skb;
	} else {
		if (priv->hw_type == P54U_NET2280)
			skb_push(skb, priv->common.tx_hdr_len);
		if (priv->common.fw_interface == FW_LM87) {
			skb_push(skb, 4);
			skb_put(skb, 4);
		}
		skb_reset_tail_pointer(skb);
		skb_trim(skb, 0);
		urb->transfer_buffer = skb_tail_pointer(skb);
	}
	skb_queue_tail(&priv->rx_queue, skb);
	usb_anchor_urb(urb, &priv->submitted);
	if (usb_submit_urb(urb, GFP_ATOMIC)) {
		skb_unlink(skb, &priv->rx_queue);
		usb_unanchor_urb(urb);
		dev_kfree_skb_irq(skb);
	}
}

static void p54u_tx_cb(struct urb *urb)
{
	struct sk_buff *skb = urb->context;
	struct ieee80211_hw *dev = (struct ieee80211_hw *)
		usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));

	p54_free_skb(dev, skb);
}

static void p54u_tx_dummy_cb(struct urb *urb) { }

static void p54u_free_urbs(struct ieee80211_hw *dev)
{
	struct p54u_priv *priv = dev->priv;
	usb_kill_anchored_urbs(&priv->submitted);
}

static int p54u_init_urbs(struct ieee80211_hw *dev)
{
	struct p54u_priv *priv = dev->priv;
	struct urb *entry = NULL;
	struct sk_buff *skb;
	struct p54u_rx_info *info;
	int ret = 0;

	while (skb_queue_len(&priv->rx_queue) < 32) {
		skb = __dev_alloc_skb(priv->common.rx_mtu + 32, GFP_KERNEL);
		if (!skb) {
			ret = -ENOMEM;
			goto err;
		}
		entry = usb_alloc_urb(0, GFP_KERNEL);
		if (!entry) {
			ret = -ENOMEM;
			goto err;
		}

		usb_fill_bulk_urb(entry, priv->udev,
				  usb_rcvbulkpipe(priv->udev, P54U_PIPE_DATA),
				  skb_tail_pointer(skb),
				  priv->common.rx_mtu + 32, p54u_rx_cb, skb);
		info = (struct p54u_rx_info *) skb->cb;
		info->urb = entry;
		info->dev = dev;
		skb_queue_tail(&priv->rx_queue, skb);

		usb_anchor_urb(entry, &priv->submitted);
		ret = usb_submit_urb(entry, GFP_KERNEL);
		if (ret) {
			skb_unlink(skb, &priv->rx_queue);
			usb_unanchor_urb(entry);
			goto err;
		}
		usb_free_urb(entry);
		entry = NULL;
	}

	return 0;

 err:
	usb_free_urb(entry);
	kfree_skb(skb);
	p54u_free_urbs(dev);
	return ret;
}

static __le32 p54u_lm87_chksum(const __le32 *data, size_t length)
{
	u32 chk = 0;

	length >>= 2;
	while (length--) {
		chk ^= le32_to_cpu(*data++);
		chk = (chk >> 5) ^ (chk << 3);
	}

	return cpu_to_le32(chk);
}

static void p54u_tx_lm87(struct ieee80211_hw *dev, struct sk_buff *skb)
{
	struct p54u_priv *priv = dev->priv;
	struct urb *data_urb;
	struct lm87_tx_hdr *hdr = (void *)skb->data - sizeof(*hdr);

	data_urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!data_urb) {
		p54_free_skb(dev, skb);
		return;
	}

	hdr->chksum = p54u_lm87_chksum((__le32 *)skb->data, skb->len);
	hdr->device_addr = ((struct p54_hdr *)skb->data)->req_id;

	usb_fill_bulk_urb(data_urb, priv->udev,
			  usb_sndbulkpipe(priv->udev, P54U_PIPE_DATA),
			  hdr, skb->len + sizeof(*hdr),  FREE_AFTER_TX(skb) ?
			  p54u_tx_cb : p54u_tx_dummy_cb, skb);
	data_urb->transfer_flags |= URB_ZERO_PACKET;

	usb_anchor_urb(data_urb, &priv->submitted);
	if (usb_submit_urb(data_urb, GFP_ATOMIC)) {
		usb_unanchor_urb(data_urb);
		p54_free_skb(dev, skb);
	}
	usb_free_urb(data_urb);
}

static void p54u_tx_net2280(struct ieee80211_hw *dev, struct sk_buff *skb)
{
	struct p54u_priv *priv = dev->priv;
	struct urb *int_urb = NULL, *data_urb = NULL;
	struct net2280_tx_hdr *hdr = (void *)skb->data - sizeof(*hdr);
	struct net2280_reg_write *reg = NULL;
	int err = -ENOMEM;

	reg = kmalloc(sizeof(*reg), GFP_ATOMIC);
	if (!reg)
		goto out;

	int_urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!int_urb)
		goto out;

	data_urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!data_urb)
		goto out;

	reg->port = cpu_to_le16(NET2280_DEV_U32);
	reg->addr = cpu_to_le32(P54U_DEV_BASE);
	reg->val = cpu_to_le32(ISL38XX_DEV_INT_DATA);

	memset(hdr, 0, sizeof(*hdr));
	hdr->len = cpu_to_le16(skb->len);
	hdr->device_addr = ((struct p54_hdr *) skb->data)->req_id;

	usb_fill_bulk_urb(int_urb, priv->udev,
		usb_sndbulkpipe(priv->udev, P54U_PIPE_DEV), reg, sizeof(*reg),
		p54u_tx_dummy_cb, dev);

	/*
	 * URB_FREE_BUFFER triggers a code path in the USB subsystem that will
	 * free what is inside the transfer_buffer after the last reference to
	 * the int_urb is dropped.
	 */
	int_urb->transfer_flags |= URB_FREE_BUFFER | URB_ZERO_PACKET;
	reg = NULL;

	usb_fill_bulk_urb(data_urb, priv->udev,
			  usb_sndbulkpipe(priv->udev, P54U_PIPE_DATA),
			  hdr, skb->len + sizeof(*hdr), FREE_AFTER_TX(skb) ?
			  p54u_tx_cb : p54u_tx_dummy_cb, skb);
	data_urb->transfer_flags |= URB_ZERO_PACKET;

	usb_anchor_urb(int_urb, &priv->submitted);
	err = usb_submit_urb(int_urb, GFP_ATOMIC);
	if (err) {
		usb_unanchor_urb(int_urb);
		goto out;
	}

	usb_anchor_urb(data_urb, &priv->submitted);
	err = usb_submit_urb(data_urb, GFP_ATOMIC);
	if (err) {
		usb_unanchor_urb(data_urb);
		goto out;
	}
out:
	usb_free_urb(int_urb);
	usb_free_urb(data_urb);

	if (err) {
		kfree(reg);
		p54_free_skb(dev, skb);
	}
}

static int p54u_write(struct p54u_priv *priv,
		      struct net2280_reg_write *buf,
		      enum net2280_op_type type,
		      __le32 addr, __le32 val)
{
	unsigned int ep;
	int alen;

	if (type & 0x0800)
		ep = usb_sndbulkpipe(priv->udev, P54U_PIPE_DEV);
	else
		ep = usb_sndbulkpipe(priv->udev, P54U_PIPE_BRG);

	buf->port = cpu_to_le16(type);
	buf->addr = addr;
	buf->val = val;

	return usb_bulk_msg(priv->udev, ep, buf, sizeof(*buf), &alen, 1000);
}

static int p54u_read(struct p54u_priv *priv, void *buf,
		     enum net2280_op_type type,
		     __le32 addr, __le32 *val)
{
	struct net2280_reg_read *read = buf;
	__le32 *reg = buf;
	unsigned int ep;
	int alen, err;

	if (type & 0x0800)
		ep = P54U_PIPE_DEV;
	else
		ep = P54U_PIPE_BRG;

	read->port = cpu_to_le16(type);
	read->addr = addr;

	err = usb_bulk_msg(priv->udev, usb_sndbulkpipe(priv->udev, ep),
			   read, sizeof(*read), &alen, 1000);
	if (err)
		return err;

	err = usb_bulk_msg(priv->udev, usb_rcvbulkpipe(priv->udev, ep),
			   reg, sizeof(*reg), &alen, 1000);
	if (err)
		return err;

	*val = *reg;
	return 0;
}

static int p54u_bulk_msg(struct p54u_priv *priv, unsigned int ep,
			 void *data, size_t len)
{
	int alen;
	return usb_bulk_msg(priv->udev, usb_sndbulkpipe(priv->udev, ep),
			    data, len, &alen, 2000);
}

static int p54u_device_reset(struct ieee80211_hw *dev)
{
	struct p54u_priv *priv = dev->priv;
	int ret, lock = (priv->intf->condition != USB_INTERFACE_BINDING);

	if (lock) {
		ret = usb_lock_device_for_reset(priv->udev, priv->intf);
		if (ret < 0) {
			dev_err(&priv->udev->dev, "(p54usb) unable to lock "
				"device for reset (%d)!\n", ret);
			return ret;
		}
	}

	ret = usb_reset_device(priv->udev);
	if (lock)
		usb_unlock_device(priv->udev);

	if (ret)
		dev_err(&priv->udev->dev, "(p54usb) unable to reset "
			"device (%d)!\n", ret);

	return ret;
}

static const char p54u_romboot_3887[] = "~~~~";
static int p54u_firmware_reset_3887(struct ieee80211_hw *dev)
{
	struct p54u_priv *priv = dev->priv;
	u8 buf[4];
	int ret;

	memcpy(&buf, p54u_romboot_3887, sizeof(buf));
	ret = p54u_bulk_msg(priv, P54U_PIPE_DATA,
			    buf, sizeof(buf));
	if (ret)
		dev_err(&priv->udev->dev, "(p54usb) unable to jump to "
			"boot ROM (%d)!\n", ret);

	return ret;
}

static const char p54u_firmware_upload_3887[] = "<\r";
static int p54u_upload_firmware_3887(struct ieee80211_hw *dev)
{
	struct p54u_priv *priv = dev->priv;
	int err, alen;
	u8 carry = 0;
	u8 *buf, *tmp;
	const u8 *data;
	unsigned int left, remains, block_size;
	struct x2_header *hdr;
	unsigned long timeout;

	err = p54u_firmware_reset_3887(dev);
	if (err)
		return err;

	tmp = buf = kmalloc(P54U_FW_BLOCK, GFP_KERNEL);
	if (!buf) {
		dev_err(&priv->udev->dev, "(p54usb) cannot allocate firmware"
					  "upload buffer!\n");
		return -ENOMEM;
	}

	left = block_size = min((size_t)P54U_FW_BLOCK, priv->fw->size);
	strcpy(buf, p54u_firmware_upload_3887);
	left -= strlen(p54u_firmware_upload_3887);
	tmp += strlen(p54u_firmware_upload_3887);

	data = priv->fw->data;
	remains = priv->fw->size;

	hdr = (struct x2_header *)(buf + strlen(p54u_firmware_upload_3887));
	memcpy(hdr->signature, X2_SIGNATURE, X2_SIGNATURE_SIZE);
	hdr->fw_load_addr = cpu_to_le32(ISL38XX_DEV_FIRMWARE_ADDR);
	hdr->fw_length = cpu_to_le32(priv->fw->size);
	hdr->crc = cpu_to_le32(~crc32_le(~0, (void *)&hdr->fw_load_addr,
					 sizeof(u32)*2));
	left -= sizeof(*hdr);
	tmp += sizeof(*hdr);

	while (remains) {
		while (left--) {
			if (carry) {
				*tmp++ = carry;
				carry = 0;
				remains--;
				continue;
			}
			switch (*data) {
			case '~':
				*tmp++ = '}';
				carry = '^';
				break;
			case '}':
				*tmp++ = '}';
				carry = ']';
				break;
			default:
				*tmp++ = *data;
				remains--;
				break;
			}
			data++;
		}

		err = p54u_bulk_msg(priv, P54U_PIPE_DATA, buf, block_size);
		if (err) {
			dev_err(&priv->udev->dev, "(p54usb) firmware "
						  "upload failed!\n");
			goto err_upload_failed;
		}

		tmp = buf;
		left = block_size = min((unsigned int)P54U_FW_BLOCK, remains);
	}

	*((__le32 *)buf) = cpu_to_le32(~crc32_le(~0, priv->fw->data,
						 priv->fw->size));
	err = p54u_bulk_msg(priv, P54U_PIPE_DATA, buf, sizeof(u32));
	if (err) {
		dev_err(&priv->udev->dev, "(p54usb) firmware upload failed!\n");
		goto err_upload_failed;
	}
	timeout = jiffies + msecs_to_jiffies(1000);
	while (!(err = usb_bulk_msg(priv->udev,
		usb_rcvbulkpipe(priv->udev, P54U_PIPE_DATA), buf, 128, &alen, 1000))) {
		if (alen > 2 && !memcmp(buf, "OK", 2))
			break;

		if (alen > 5 && !memcmp(buf, "ERROR", 5)) {
			err = -EINVAL;
			break;
		}

		if (time_after(jiffies, timeout)) {
			dev_err(&priv->udev->dev, "(p54usb) firmware boot "
						  "timed out!\n");
			err = -ETIMEDOUT;
			break;
		}
	}
	if (err) {
		dev_err(&priv->udev->dev, "(p54usb) firmware upload failed!\n");
		goto err_upload_failed;
	}

	buf[0] = 'g';
	buf[1] = '\r';
	err = p54u_bulk_msg(priv, P54U_PIPE_DATA, buf, 2);
	if (err) {
		dev_err(&priv->udev->dev, "(p54usb) firmware boot failed!\n");
		goto err_upload_failed;
	}

	timeout = jiffies + msecs_to_jiffies(1000);
	while (!(err = usb_bulk_msg(priv->udev,
		usb_rcvbulkpipe(priv->udev, P54U_PIPE_DATA), buf, 128, &alen, 1000))) {
		if (alen > 0 && buf[0] == 'g')
			break;

		if (time_after(jiffies, timeout)) {
			err = -ETIMEDOUT;
			break;
		}
	}
	if (err)
		goto err_upload_failed;

err_upload_failed:
	kfree(buf);
	return err;
}

static int p54u_upload_firmware_net2280(struct ieee80211_hw *dev)
{
	struct p54u_priv *priv = dev->priv;
	const struct p54p_csr *devreg = (const struct p54p_csr *) P54U_DEV_BASE;
	int err, alen;
	void *buf;
	__le32 reg;
	unsigned int remains, offset;
	const u8 *data;

	buf = kmalloc(512, GFP_KERNEL);
	if (!buf) {
		dev_err(&priv->udev->dev, "(p54usb) firmware buffer "
					  "alloc failed!\n");
		return -ENOMEM;
	}

#define P54U_WRITE(type, addr, data) \
	do {\
		err = p54u_write(priv, buf, type,\
				 cpu_to_le32((u32)(unsigned long)addr), data);\
		if (err) \
			goto fail;\
	} while (0)

#define P54U_READ(type, addr) \
	do {\
		err = p54u_read(priv, buf, type,\
				cpu_to_le32((u32)(unsigned long)addr), &reg);\
		if (err)\
			goto fail;\
	} while (0)

	/* power down net2280 bridge */
	P54U_READ(NET2280_BRG_U32, NET2280_GPIOCTL);
	reg |= cpu_to_le32(P54U_BRG_POWER_DOWN);
	reg &= cpu_to_le32(~P54U_BRG_POWER_UP);
	P54U_WRITE(NET2280_BRG_U32, NET2280_GPIOCTL, reg);

	mdelay(100);

	/* power up bridge */
	reg |= cpu_to_le32(P54U_BRG_POWER_UP);
	reg &= cpu_to_le32(~P54U_BRG_POWER_DOWN);
	P54U_WRITE(NET2280_BRG_U32, NET2280_GPIOCTL, reg);

	mdelay(100);

	P54U_WRITE(NET2280_BRG_U32, NET2280_DEVINIT,
		   cpu_to_le32(NET2280_CLK_30Mhz |
			       NET2280_PCI_ENABLE |
			       NET2280_PCI_SOFT_RESET));

	mdelay(20);

	P54U_WRITE(NET2280_BRG_CFG_U16, PCI_COMMAND,
		   cpu_to_le32(PCI_COMMAND_MEMORY |
			       PCI_COMMAND_MASTER));

	P54U_WRITE(NET2280_BRG_CFG_U32, PCI_BASE_ADDRESS_0,
		   cpu_to_le32(NET2280_BASE));

	P54U_READ(NET2280_BRG_CFG_U16, PCI_STATUS);
	reg |= cpu_to_le32(PCI_STATUS_REC_MASTER_ABORT);
	P54U_WRITE(NET2280_BRG_CFG_U16, PCI_STATUS, reg);

	// TODO: we really need this?
	P54U_READ(NET2280_BRG_U32, NET2280_RELNUM);

	P54U_WRITE(NET2280_BRG_U32, NET2280_EPA_RSP,
		   cpu_to_le32(NET2280_CLEAR_NAK_OUT_PACKETS_MODE));
	P54U_WRITE(NET2280_BRG_U32, NET2280_EPC_RSP,
		   cpu_to_le32(NET2280_CLEAR_NAK_OUT_PACKETS_MODE));

	P54U_WRITE(NET2280_BRG_CFG_U32, PCI_BASE_ADDRESS_2,
		   cpu_to_le32(NET2280_BASE2));

	/* finally done setting up the bridge */

	P54U_WRITE(NET2280_DEV_CFG_U16, 0x10000 | PCI_COMMAND,
		   cpu_to_le32(PCI_COMMAND_MEMORY |
			       PCI_COMMAND_MASTER));

	P54U_WRITE(NET2280_DEV_CFG_U16, 0x10000 | 0x40 /* TRDY timeout */, 0);
	P54U_WRITE(NET2280_DEV_CFG_U32, 0x10000 | PCI_BASE_ADDRESS_0,
		   cpu_to_le32(P54U_DEV_BASE));

	P54U_WRITE(NET2280_BRG_U32, NET2280_USBIRQENB1, 0);
	P54U_WRITE(NET2280_BRG_U32, NET2280_IRQSTAT1,
		   cpu_to_le32(NET2280_PCI_INTA_INTERRUPT));

	/* do romboot */
	P54U_WRITE(NET2280_DEV_U32, &devreg->int_enable, 0);

	P54U_READ(NET2280_DEV_U32, &devreg->ctrl_stat);
	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RESET);
	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RAMBOOT);
	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_CLKRUN);
	P54U_WRITE(NET2280_DEV_U32, &devreg->ctrl_stat, reg);

	mdelay(20);

	reg |= cpu_to_le32(ISL38XX_CTRL_STAT_RESET);
	P54U_WRITE(NET2280_DEV_U32, &devreg->ctrl_stat, reg);

	mdelay(20);

	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RESET);
	P54U_WRITE(NET2280_DEV_U32, &devreg->ctrl_stat, reg);

	mdelay(100);

	P54U_READ(NET2280_DEV_U32, &devreg->int_ident);
	P54U_WRITE(NET2280_DEV_U32, &devreg->int_ack, reg);

	/* finally, we can upload firmware now! */
	remains = priv->fw->size;
	data = priv->fw->data;
	offset = ISL38XX_DEV_FIRMWARE_ADDR;

	while (remains) {
		unsigned int block_len = min(remains, (unsigned int)512);
		memcpy(buf, data, block_len);

		err = p54u_bulk_msg(priv, P54U_PIPE_DATA, buf, block_len);
		if (err) {
			dev_err(&priv->udev->dev, "(p54usb) firmware block "
						  "upload failed\n");
			goto fail;
		}

		P54U_WRITE(NET2280_DEV_U32, &devreg->direct_mem_base,
			   cpu_to_le32(0xc0000f00));

		P54U_WRITE(NET2280_DEV_U32,
			   0x0020 | (unsigned long)&devreg->direct_mem_win, 0);
		P54U_WRITE(NET2280_DEV_U32,
			   0x0020 | (unsigned long)&devreg->direct_mem_win,
			   cpu_to_le32(1));

		P54U_WRITE(NET2280_DEV_U32,
			   0x0024 | (unsigned long)&devreg->direct_mem_win,
			   cpu_to_le32(block_len));
		P54U_WRITE(NET2280_DEV_U32,
			   0x0028 | (unsigned long)&devreg->direct_mem_win,
			   cpu_to_le32(offset));

		P54U_WRITE(NET2280_DEV_U32, &devreg->dma_addr,
			   cpu_to_le32(NET2280_EPA_FIFO_PCI_ADDR));
		P54U_WRITE(NET2280_DEV_U32, &devreg->dma_len,
			   cpu_to_le32(block_len >> 2));
		P54U_WRITE(NET2280_DEV_U32, &devreg->dma_ctrl,
			   cpu_to_le32(ISL38XX_DMA_MASTER_CONTROL_TRIGGER));

		mdelay(10);

		P54U_READ(NET2280_DEV_U32,
			  0x002C | (unsigned long)&devreg->direct_mem_win);
		if (!(reg & cpu_to_le32(ISL38XX_DMA_STATUS_DONE)) ||
		    !(reg & cpu_to_le32(ISL38XX_DMA_STATUS_READY))) {
			dev_err(&priv->udev->dev, "(p54usb) firmware DMA "
						  "transfer failed\n");
			goto fail;
		}

		P54U_WRITE(NET2280_BRG_U32, NET2280_EPA_STAT,
			   cpu_to_le32(NET2280_FIFO_FLUSH));

		remains -= block_len;
		data += block_len;
		offset += block_len;
	}

	/* do ramboot */
	P54U_READ(NET2280_DEV_U32, &devreg->ctrl_stat);
	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RESET);
	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_CLKRUN);
	reg |= cpu_to_le32(ISL38XX_CTRL_STAT_RAMBOOT);
	P54U_WRITE(NET2280_DEV_U32, &devreg->ctrl_stat, reg);

	mdelay(20);

	reg |= cpu_to_le32(ISL38XX_CTRL_STAT_RESET);
	P54U_WRITE(NET2280_DEV_U32, &devreg->ctrl_stat, reg);

	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RESET);
	P54U_WRITE(NET2280_DEV_U32, &devreg->ctrl_stat, reg);

	mdelay(100);

	P54U_READ(NET2280_DEV_U32, &devreg->int_ident);
	P54U_WRITE(NET2280_DEV_U32, &devreg->int_ack, reg);

	/* start up the firmware */
	P54U_WRITE(NET2280_DEV_U32, &devreg->int_enable,
		   cpu_to_le32(ISL38XX_INT_IDENT_INIT));

	P54U_WRITE(NET2280_BRG_U32, NET2280_IRQSTAT1,
		   cpu_to_le32(NET2280_PCI_INTA_INTERRUPT));

	P54U_WRITE(NET2280_BRG_U32, NET2280_USBIRQENB1,
		   cpu_to_le32(NET2280_PCI_INTA_INTERRUPT_ENABLE |
			       NET2280_USB_INTERRUPT_ENABLE));

	P54U_WRITE(NET2280_DEV_U32, &devreg->dev_int,
		   cpu_to_le32(ISL38XX_DEV_INT_RESET));

	err = usb_interrupt_msg(priv->udev,
				usb_rcvbulkpipe(priv->udev, P54U_PIPE_INT),
				buf, sizeof(__le32), &alen, 1000);
	if (err || alen != sizeof(__le32))
		goto fail;

	P54U_READ(NET2280_DEV_U32, &devreg->int_ident);
	P54U_WRITE(NET2280_DEV_U32, &devreg->int_ack, reg);

	if (!(reg & cpu_to_le32(ISL38XX_INT_IDENT_INIT)))
		err = -EINVAL;

	P54U_WRITE(NET2280_BRG_U32, NET2280_USBIRQENB1, 0);
	P54U_WRITE(NET2280_BRG_U32, NET2280_IRQSTAT1,
		   cpu_to_le32(NET2280_PCI_INTA_INTERRUPT));

#undef P54U_WRITE
#undef P54U_READ

fail:
	kfree(buf);
	return err;
}

static int p54u_load_firmware(struct ieee80211_hw *dev)
{
	struct p54u_priv *priv = dev->priv;
	int err, i;

	BUILD_BUG_ON(ARRAY_SIZE(p54u_fwlist) != __NUM_P54U_HWTYPES);

	for (i = 0; i < __NUM_P54U_HWTYPES; i++)
		if (p54u_fwlist[i].type == priv->hw_type)
			break;

	if (i == __NUM_P54U_HWTYPES)
		return -EOPNOTSUPP;

	err = request_firmware(&priv->fw, p54u_fwlist[i].fw, &priv->udev->dev);
	if (err) {
		dev_err(&priv->udev->dev, "(p54usb) cannot load firmware %s "
					  "(%d)!\n", p54u_fwlist[i].fw, err);

		err = request_firmware(&priv->fw, p54u_fwlist[i].fw_legacy,
				       &priv->udev->dev);
		if (err)
			return err;
	}

	err = p54_parse_firmware(dev, priv->fw);
	if (err)
		goto out;

	if (priv->common.fw_interface != p54u_fwlist[i].intf) {
		dev_err(&priv->udev->dev, "wrong firmware, please get "
			"a firmware for \"%s\" and try again.\n",
			p54u_fwlist[i].hw);
		err = -EINVAL;
	}

out:
	if (err)
		release_firmware(priv->fw);

	return err;
}

static int p54u_open(struct ieee80211_hw *dev)
{
	struct p54u_priv *priv = dev->priv;
	int err;

	err = p54u_init_urbs(dev);
	if (err) {
		return err;
	}

	priv->common.open = p54u_init_urbs;

	return 0;
}

static void p54u_stop(struct ieee80211_hw *dev)
{
	/* TODO: figure out how to reliably stop the 3887 and net2280 so
	   the hardware is still usable next time we want to start it.
	   until then, we just stop listening to the hardware.. */
	p54u_free_urbs(dev);
	return;
}

static int __devinit p54u_probe(struct usb_interface *intf,
				const struct usb_device_id *id)
{
	struct usb_device *udev = interface_to_usbdev(intf);
	struct ieee80211_hw *dev;
	struct p54u_priv *priv;
	int err;
	unsigned int i, recognized_pipes;

	dev = p54_init_common(sizeof(*priv));

	if (!dev) {
		dev_err(&udev->dev, "(p54usb) ieee80211 alloc failed\n");
		return -ENOMEM;
	}

	priv = dev->priv;
	priv->hw_type = P54U_INVALID_HW;

	SET_IEEE80211_DEV(dev, &intf->dev);
	usb_set_intfdata(intf, dev);
	priv->udev = udev;
	priv->intf = intf;
	skb_queue_head_init(&priv->rx_queue);
	init_usb_anchor(&priv->submitted);

	usb_get_dev(udev);

	/* really lazy and simple way of figuring out if we're a 3887 */
	/* TODO: should just stick the identification in the device table */
	i = intf->altsetting->desc.bNumEndpoints;
	recognized_pipes = 0;
	while (i--) {
		switch (intf->altsetting->endpoint[i].desc.bEndpointAddress) {
		case P54U_PIPE_DATA:
		case P54U_PIPE_MGMT:
		case P54U_PIPE_BRG:
		case P54U_PIPE_DEV:
		case P54U_PIPE_DATA | USB_DIR_IN:
		case P54U_PIPE_MGMT | USB_DIR_IN:
		case P54U_PIPE_BRG | USB_DIR_IN:
		case P54U_PIPE_DEV | USB_DIR_IN:
		case P54U_PIPE_INT | USB_DIR_IN:
			recognized_pipes++;
		}
	}
	priv->common.open = p54u_open;
	priv->common.stop = p54u_stop;
	if (recognized_pipes < P54U_PIPE_NUMBER) {
#ifdef CONFIG_PM
		/* ISL3887 needs a full reset on resume */
		udev->reset_resume = 1;
		err = p54u_device_reset(dev);
#endif

		priv->hw_type = P54U_3887;
		dev->extra_tx_headroom += sizeof(struct lm87_tx_hdr);
		priv->common.tx_hdr_len = sizeof(struct lm87_tx_hdr);
		priv->common.tx = p54u_tx_lm87;
		priv->upload_fw = p54u_upload_firmware_3887;
	} else {
		priv->hw_type = P54U_NET2280;
		dev->extra_tx_headroom += sizeof(struct net2280_tx_hdr);
		priv->common.tx_hdr_len = sizeof(struct net2280_tx_hdr);
		priv->common.tx = p54u_tx_net2280;
		priv->upload_fw = p54u_upload_firmware_net2280;
	}
	err = p54u_load_firmware(dev);
	if (err)
		goto err_free_dev;

	err = priv->upload_fw(dev);
	if (err)
		goto err_free_fw;

	p54u_open(dev);
	err = p54_read_eeprom(dev);
	p54u_stop(dev);
	if (err)
		goto err_free_fw;

	err = p54_register_common(dev, &udev->dev);
	if (err)
		goto err_free_fw;

	return 0;

err_free_fw:
	release_firmware(priv->fw);

err_free_dev:
	p54_free_common(dev);
	usb_set_intfdata(intf, NULL);
	usb_put_dev(udev);
	return err;
}

static void __devexit p54u_disconnect(struct usb_interface *intf)
{
	struct ieee80211_hw *dev = usb_get_intfdata(intf);
	struct p54u_priv *priv;

	if (!dev)
		return;

	p54_unregister_common(dev);

	priv = dev->priv;
	usb_put_dev(interface_to_usbdev(intf));
	release_firmware(priv->fw);
	p54_free_common(dev);
}

static int p54u_pre_reset(struct usb_interface *intf)
{
	struct ieee80211_hw *dev = usb_get_intfdata(intf);

	if (!dev)
		return -ENODEV;

	p54u_stop(dev);
	return 0;
}

static int p54u_resume(struct usb_interface *intf)
{
	struct ieee80211_hw *dev = usb_get_intfdata(intf);
	struct p54u_priv *priv;

	if (!dev)
		return -ENODEV;

	priv = dev->priv;
	if (unlikely(!(priv->upload_fw && priv->fw)))
		return 0;

	return priv->upload_fw(dev);
}

static int p54u_post_reset(struct usb_interface *intf)
{
	struct ieee80211_hw *dev = usb_get_intfdata(intf);
	struct p54u_priv *priv;
	int err;

	err = p54u_resume(intf);
	if (err)
		return err;

	/* reinitialize old device state */
	priv = dev->priv;
	if (priv->common.mode != NL80211_IFTYPE_UNSPECIFIED)
		ieee80211_restart_hw(dev);

	return 0;
}

#ifdef CONFIG_PM

static int p54u_suspend(struct usb_interface *intf, pm_message_t message)
{
	return p54u_pre_reset(intf);
}

#endif /* CONFIG_PM */

static struct usb_driver p54u_driver = {
	.name	= "p54usb",
	.id_table = p54u_table,
	.probe = p54u_probe,
	.disconnect = p54u_disconnect,
	.pre_reset = p54u_pre_reset,
	.post_reset = p54u_post_reset,
#ifdef CONFIG_PM
	.suspend = p54u_suspend,
	.resume = p54u_resume,
	.reset_resume = p54u_resume,
#endif /* CONFIG_PM */
	.soft_unbind = 1,
};

static int __init p54u_init(void)
{
	return usb_register(&p54u_driver);
}

static void __exit p54u_exit(void)
{
	usb_deregister(&p54u_driver);
}

module_init(p54u_init);
module_exit(p54u_exit);