summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/purelifi/plfxlc/usb.c
blob: 39e54b3787d6abb7fc1f9fd38d639eed6e3b42bd (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2021 pureLiFi
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/usb.h>
#include <linux/workqueue.h>
#include <linux/proc_fs.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/module.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>
#include <linux/sysfs.h>

#include "mac.h"
#include "usb.h"
#include "chip.h"

static const struct usb_device_id usb_ids[] = {
	{ USB_DEVICE(PURELIFI_X_VENDOR_ID_0, PURELIFI_X_PRODUCT_ID_0),
	  .driver_info = DEVICE_LIFI_X },
	{ USB_DEVICE(PURELIFI_XC_VENDOR_ID_0, PURELIFI_XC_PRODUCT_ID_0),
	  .driver_info = DEVICE_LIFI_XC },
	{ USB_DEVICE(PURELIFI_XL_VENDOR_ID_0, PURELIFI_XL_PRODUCT_ID_0),
	  .driver_info = DEVICE_LIFI_XL },
	{}
};

void plfxlc_send_packet_from_data_queue(struct plfxlc_usb *usb)
{
	struct plfxlc_usb_tx *tx = &usb->tx;
	struct sk_buff *skb = NULL;
	unsigned long flags;
	u8 last_served_sidx;

	spin_lock_irqsave(&tx->lock, flags);
	last_served_sidx = usb->sidx;
	do {
		usb->sidx = (usb->sidx + 1) % MAX_STA_NUM;
		if (!(tx->station[usb->sidx].flag & STATION_CONNECTED_FLAG))
			continue;
		if (!(tx->station[usb->sidx].flag & STATION_FIFO_FULL_FLAG))
			skb = skb_peek(&tx->station[usb->sidx].data_list);
	} while ((usb->sidx != last_served_sidx) && (!skb));

	if (skb) {
		skb = skb_dequeue(&tx->station[usb->sidx].data_list);
		plfxlc_usb_wreq_async(usb, skb->data, skb->len, USB_REQ_DATA_TX,
				      plfxlc_tx_urb_complete, skb);
		if (skb_queue_len(&tx->station[usb->sidx].data_list) <= 60)
			ieee80211_wake_queues(plfxlc_usb_to_hw(usb));
	}
	spin_unlock_irqrestore(&tx->lock, flags);
}

static void handle_rx_packet(struct plfxlc_usb *usb, const u8 *buffer,
			     unsigned int length)
{
	plfxlc_mac_rx(plfxlc_usb_to_hw(usb), buffer, length);
}

static void rx_urb_complete(struct urb *urb)
{
	struct plfxlc_usb_tx *tx;
	struct plfxlc_usb *usb;
	unsigned int length;
	const u8 *buffer;
	u16 status;
	u8 sidx;
	int r;

	if (!urb) {
		pr_err("urb is NULL\n");
		return;
	}
	if (!urb->context) {
		pr_err("urb ctx is NULL\n");
		return;
	}
	usb = urb->context;

	if (usb->initialized != 1) {
		pr_err("usb is not initialized\n");
		return;
	}

	tx = &usb->tx;
	switch (urb->status) {
	case 0:
		break;
	case -ESHUTDOWN:
	case -EINVAL:
	case -ENODEV:
	case -ENOENT:
	case -ECONNRESET:
	case -EPIPE:
		dev_dbg(plfxlc_urb_dev(urb), "urb %p error %d\n", urb, urb->status);
		return;
	default:
		dev_dbg(plfxlc_urb_dev(urb), "urb %p error %d\n", urb, urb->status);
		if (tx->submitted_urbs++ < PURELIFI_URB_RETRY_MAX) {
			dev_dbg(plfxlc_urb_dev(urb), "urb %p resubmit %d", urb,
				tx->submitted_urbs++);
			goto resubmit;
		} else {
			dev_dbg(plfxlc_urb_dev(urb), "urb %p  max resubmits reached", urb);
			tx->submitted_urbs = 0;
			return;
		}
	}

	buffer = urb->transfer_buffer;
	length = le32_to_cpu(*(__le32 *)(buffer + sizeof(struct rx_status)))
		 + sizeof(u32);

	if (urb->actual_length != (PLF_MSG_STATUS_OFFSET + 1)) {
		if (usb->initialized && usb->link_up)
			handle_rx_packet(usb, buffer, length);
		goto resubmit;
	}

	status = buffer[PLF_MSG_STATUS_OFFSET];

	switch (status) {
	case STATION_FIFO_ALMOST_FULL_NOT_MESSAGE:
		dev_dbg(&usb->intf->dev,
			"FIFO full not packet receipt\n");
		tx->mac_fifo_full = 1;
		for (sidx = 0; sidx < MAX_STA_NUM; sidx++)
			tx->station[sidx].flag |= STATION_FIFO_FULL_FLAG;
		break;
	case STATION_FIFO_ALMOST_FULL_MESSAGE:
		dev_dbg(&usb->intf->dev, "FIFO full packet receipt\n");

		for (sidx = 0; sidx < MAX_STA_NUM; sidx++)
			tx->station[sidx].flag &= STATION_ACTIVE_FLAG;

		plfxlc_send_packet_from_data_queue(usb);
		break;
	case STATION_CONNECT_MESSAGE:
		usb->link_up = 1;
		dev_dbg(&usb->intf->dev, "ST_CONNECT_MSG packet receipt\n");
		break;
	case STATION_DISCONNECT_MESSAGE:
		usb->link_up = 0;
		dev_dbg(&usb->intf->dev, "ST_DISCONN_MSG packet receipt\n");
		break;
	default:
		dev_dbg(&usb->intf->dev, "Unknown packet receipt\n");
		break;
	}

resubmit:
	r = usb_submit_urb(urb, GFP_ATOMIC);
	if (r)
		dev_dbg(plfxlc_urb_dev(urb), "urb %p resubmit fail (%d)\n", urb, r);
}

static struct urb *alloc_rx_urb(struct plfxlc_usb *usb)
{
	struct usb_device *udev = plfxlc_usb_to_usbdev(usb);
	struct urb *urb;
	void *buffer;

	urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!urb)
		return NULL;

	buffer = usb_alloc_coherent(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
				    &urb->transfer_dma);
	if (!buffer) {
		usb_free_urb(urb);
		return NULL;
	}

	usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
			  buffer, USB_MAX_RX_SIZE,
			  rx_urb_complete, usb);
	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

	return urb;
}

static void free_rx_urb(struct urb *urb)
{
	if (!urb)
		return;
	usb_free_coherent(urb->dev, urb->transfer_buffer_length,
			  urb->transfer_buffer, urb->transfer_dma);
	usb_free_urb(urb);
}

static int __lf_x_usb_enable_rx(struct plfxlc_usb *usb)
{
	struct plfxlc_usb_rx *rx = &usb->rx;
	struct urb **urbs;
	int i, r;

	r = -ENOMEM;
	urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
	if (!urbs)
		goto error;

	for (i = 0; i < RX_URBS_COUNT; i++) {
		urbs[i] = alloc_rx_urb(usb);
		if (!urbs[i])
			goto error;
	}

	spin_lock_irq(&rx->lock);

	dev_dbg(plfxlc_usb_dev(usb), "irq_disabled %d\n", irqs_disabled());

	if (rx->urbs) {
		spin_unlock_irq(&rx->lock);
		r = 0;
		goto error;
	}
	rx->urbs = urbs;
	rx->urbs_count = RX_URBS_COUNT;
	spin_unlock_irq(&rx->lock);

	for (i = 0; i < RX_URBS_COUNT; i++) {
		r = usb_submit_urb(urbs[i], GFP_KERNEL);
		if (r)
			goto error_submit;
	}

	return 0;

error_submit:
	for (i = 0; i < RX_URBS_COUNT; i++)
		usb_kill_urb(urbs[i]);
	spin_lock_irq(&rx->lock);
	rx->urbs = NULL;
	rx->urbs_count = 0;
	spin_unlock_irq(&rx->lock);
error:
	if (urbs) {
		for (i = 0; i < RX_URBS_COUNT; i++)
			free_rx_urb(urbs[i]);
	}
	return r;
}

int plfxlc_usb_enable_rx(struct plfxlc_usb *usb)
{
	struct plfxlc_usb_rx *rx = &usb->rx;
	int r;

	mutex_lock(&rx->setup_mutex);
	r = __lf_x_usb_enable_rx(usb);
	if (!r)
		usb->rx_usb_enabled = 1;

	mutex_unlock(&rx->setup_mutex);

	return r;
}

static void __lf_x_usb_disable_rx(struct plfxlc_usb *usb)
{
	struct plfxlc_usb_rx *rx = &usb->rx;
	unsigned long flags;
	unsigned int count;
	struct urb **urbs;
	int i;

	spin_lock_irqsave(&rx->lock, flags);
	urbs = rx->urbs;
	count = rx->urbs_count;
	spin_unlock_irqrestore(&rx->lock, flags);

	if (!urbs)
		return;

	for (i = 0; i < count; i++) {
		usb_kill_urb(urbs[i]);
		free_rx_urb(urbs[i]);
	}
	kfree(urbs);
	rx->urbs = NULL;
	rx->urbs_count = 0;
}

void plfxlc_usb_disable_rx(struct plfxlc_usb *usb)
{
	struct plfxlc_usb_rx *rx = &usb->rx;

	mutex_lock(&rx->setup_mutex);
	__lf_x_usb_disable_rx(usb);
	usb->rx_usb_enabled = 0;
	mutex_unlock(&rx->setup_mutex);
}

void plfxlc_usb_disable_tx(struct plfxlc_usb *usb)
{
	struct plfxlc_usb_tx *tx = &usb->tx;
	unsigned long flags;

	clear_bit(PLF_BIT_ENABLED, &tx->enabled);

	/* kill all submitted tx-urbs */
	usb_kill_anchored_urbs(&tx->submitted);

	spin_lock_irqsave(&tx->lock, flags);
	WARN_ON(!skb_queue_empty(&tx->submitted_skbs));
	WARN_ON(tx->submitted_urbs != 0);
	tx->submitted_urbs = 0;
	spin_unlock_irqrestore(&tx->lock, flags);

	/* The stopped state is ignored, relying on ieee80211_wake_queues()
	 * in a potentionally following plfxlc_usb_enable_tx().
	 */
}

void plfxlc_usb_enable_tx(struct plfxlc_usb *usb)
{
	struct plfxlc_usb_tx *tx = &usb->tx;
	unsigned long flags;

	spin_lock_irqsave(&tx->lock, flags);
	set_bit(PLF_BIT_ENABLED, &tx->enabled);
	tx->submitted_urbs = 0;
	ieee80211_wake_queues(plfxlc_usb_to_hw(usb));
	tx->stopped = 0;
	spin_unlock_irqrestore(&tx->lock, flags);
}

void plfxlc_tx_urb_complete(struct urb *urb)
{
	struct ieee80211_tx_info *info;
	struct plfxlc_usb *usb;
	struct sk_buff *skb;

	skb = urb->context;
	info = IEEE80211_SKB_CB(skb);
	/* grab 'usb' pointer before handing off the skb (since
	 * it might be freed by plfxlc_mac_tx_to_dev or mac80211)
	 */
	usb = &plfxlc_hw_mac(info->rate_driver_data[0])->chip.usb;

	switch (urb->status) {
	case 0:
		break;
	case -ESHUTDOWN:
	case -EINVAL:
	case -ENODEV:
	case -ENOENT:
	case -ECONNRESET:
	case -EPIPE:
		dev_dbg(plfxlc_urb_dev(urb), "urb %p error %d\n", urb, urb->status);
		break;
	default:
		dev_dbg(plfxlc_urb_dev(urb), "urb %p error %d\n", urb, urb->status);
		return;
	}

	plfxlc_mac_tx_to_dev(skb, urb->status);
	plfxlc_send_packet_from_data_queue(usb);
	usb_free_urb(urb);
}

static inline void init_usb_rx(struct plfxlc_usb *usb)
{
	struct plfxlc_usb_rx *rx = &usb->rx;

	spin_lock_init(&rx->lock);
	mutex_init(&rx->setup_mutex);

	if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH)
		rx->usb_packet_size = 512;
	else
		rx->usb_packet_size = 64;

	if (rx->fragment_length != 0)
		dev_dbg(plfxlc_usb_dev(usb), "fragment_length error\n");
}

static inline void init_usb_tx(struct plfxlc_usb *usb)
{
	struct plfxlc_usb_tx *tx = &usb->tx;

	spin_lock_init(&tx->lock);
	clear_bit(PLF_BIT_ENABLED, &tx->enabled);
	tx->stopped = 0;
	skb_queue_head_init(&tx->submitted_skbs);
	init_usb_anchor(&tx->submitted);
}

void plfxlc_usb_init(struct plfxlc_usb *usb, struct ieee80211_hw *hw,
		     struct usb_interface *intf)
{
	memset(usb, 0, sizeof(*usb));
	usb->intf = usb_get_intf(intf);
	usb_set_intfdata(usb->intf, hw);
	init_usb_tx(usb);
	init_usb_rx(usb);
}

void plfxlc_usb_release(struct plfxlc_usb *usb)
{
	plfxlc_op_stop(plfxlc_usb_to_hw(usb));
	plfxlc_usb_disable_tx(usb);
	plfxlc_usb_disable_rx(usb);
	usb_set_intfdata(usb->intf, NULL);
	usb_put_intf(usb->intf);
}

const char *plfxlc_speed(enum usb_device_speed speed)
{
	switch (speed) {
	case USB_SPEED_LOW:
		return "low";
	case USB_SPEED_FULL:
		return "full";
	case USB_SPEED_HIGH:
		return "high";
	default:
		return "unknown";
	}
}

int plfxlc_usb_init_hw(struct plfxlc_usb *usb)
{
	int r;

	r = usb_reset_configuration(plfxlc_usb_to_usbdev(usb));
	if (r) {
		dev_err(plfxlc_usb_dev(usb), "cfg reset failed (%d)\n", r);
		return r;
	}
	return 0;
}

static void get_usb_req(struct usb_device *udev, void *buffer,
			u32 buffer_len, enum plf_usb_req_enum usb_req_id,
			struct plf_usb_req *usb_req)
{
	__be32 payload_len_nw = cpu_to_be32(buffer_len + FCS_LEN);
	const u8 *buffer_src_p = buffer;
	u8 *buffer_dst = usb_req->buf;
	u32 temp_usb_len = 0;

	usb_req->id = cpu_to_be32(usb_req_id);
	usb_req->len  = cpu_to_be32(0);

	/* Copy buffer length into the transmitted buffer, as it is important
	 * for the Rx MAC to know its exact length.
	 */
	if (usb_req->id == cpu_to_be32(USB_REQ_BEACON_WR)) {
		memcpy(buffer_dst, &payload_len_nw, sizeof(payload_len_nw));
		buffer_dst += sizeof(payload_len_nw);
		temp_usb_len += sizeof(payload_len_nw);
	}

	memcpy(buffer_dst, buffer_src_p, buffer_len);
	buffer_dst += buffer_len;
	buffer_src_p += buffer_len;
	temp_usb_len +=  buffer_len;

	/* Set the FCS_LEN (4) bytes as 0 for CRC checking. */
	memset(buffer_dst, 0, FCS_LEN);
	buffer_dst += FCS_LEN;
	temp_usb_len += FCS_LEN;

	/* Round the packet to be transmitted to 4 bytes. */
	if (temp_usb_len % PURELIFI_BYTE_NUM_ALIGNMENT) {
		memset(buffer_dst, 0, PURELIFI_BYTE_NUM_ALIGNMENT -
		       (temp_usb_len %
			PURELIFI_BYTE_NUM_ALIGNMENT));
		buffer_dst += PURELIFI_BYTE_NUM_ALIGNMENT -
				(temp_usb_len %
				PURELIFI_BYTE_NUM_ALIGNMENT);
		temp_usb_len += PURELIFI_BYTE_NUM_ALIGNMENT -
				(temp_usb_len % PURELIFI_BYTE_NUM_ALIGNMENT);
	}

	usb_req->len = cpu_to_be32(temp_usb_len);
}

int plfxlc_usb_wreq_async(struct plfxlc_usb *usb, const u8 *buffer,
			  int buffer_len, enum plf_usb_req_enum usb_req_id,
			  usb_complete_t complete_fn,
			  void *context)
{
	struct usb_device *udev = interface_to_usbdev(usb->ez_usb);
	struct urb *urb = usb_alloc_urb(0, GFP_ATOMIC);
	int r;

	usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
			  (void *)buffer, buffer_len, complete_fn, context);

	r = usb_submit_urb(urb, GFP_ATOMIC);
	if (r)
		dev_err(&udev->dev, "Async write submit failed (%d)\n", r);

	return r;
}

int plfxlc_usb_wreq(struct usb_interface *ez_usb, void *buffer, int buffer_len,
		    enum plf_usb_req_enum usb_req_id)
{
	struct usb_device *udev = interface_to_usbdev(ez_usb);
	unsigned char *dma_buffer = NULL;
	struct plf_usb_req usb_req;
	int usb_bulk_msg_len;
	int actual_length;
	int r;

	get_usb_req(udev, buffer, buffer_len, usb_req_id, &usb_req);
	usb_bulk_msg_len = sizeof(__le32) + sizeof(__le32) +
			   be32_to_cpu(usb_req.len);

	dma_buffer = kmemdup(&usb_req, usb_bulk_msg_len, GFP_KERNEL);

	if (!dma_buffer) {
		r = -ENOMEM;
		goto error;
	}

	r = usb_bulk_msg(udev,
			 usb_sndbulkpipe(udev, EP_DATA_OUT),
			 dma_buffer, usb_bulk_msg_len,
			 &actual_length, USB_BULK_MSG_TIMEOUT_MS);
	kfree(dma_buffer);
error:
	if (r) {
		r = -ENOMEM;
		dev_err(&udev->dev, "usb_bulk_msg failed (%d)\n", r);
	}

	return r;
}

static void slif_data_plane_sap_timer_callb(struct timer_list *t)
{
	struct plfxlc_usb *usb = from_timer(usb, t, tx.tx_retry_timer);

	plfxlc_send_packet_from_data_queue(usb);
	timer_setup(&usb->tx.tx_retry_timer,
		    slif_data_plane_sap_timer_callb, 0);
	mod_timer(&usb->tx.tx_retry_timer, jiffies + TX_RETRY_BACKOFF_JIFF);
}

static void sta_queue_cleanup_timer_callb(struct timer_list *t)
{
	struct plfxlc_usb *usb = from_timer(usb, t, sta_queue_cleanup);
	struct plfxlc_usb_tx *tx = &usb->tx;
	int sidx;

	for (sidx = 0; sidx < MAX_STA_NUM - 1; sidx++) {
		if (!(tx->station[sidx].flag & STATION_CONNECTED_FLAG))
			continue;
		if (tx->station[sidx].flag & STATION_HEARTBEAT_FLAG) {
			tx->station[sidx].flag ^= STATION_HEARTBEAT_FLAG;
		} else {
			eth_zero_addr(tx->station[sidx].mac);
			tx->station[sidx].flag = 0;
		}
	}
	timer_setup(&usb->sta_queue_cleanup,
		    sta_queue_cleanup_timer_callb, 0);
	mod_timer(&usb->sta_queue_cleanup, jiffies + STA_QUEUE_CLEANUP_JIFF);
}

static int probe(struct usb_interface *intf,
		 const struct usb_device_id *id)
{
	u8 serial_number[PURELIFI_SERIAL_LEN];
	struct ieee80211_hw *hw = NULL;
	struct plfxlc_usb_tx *tx;
	struct plfxlc_chip *chip;
	struct plfxlc_usb *usb;
	u8 hw_address[ETH_ALEN];
	unsigned int i;
	int r = 0;

	hw = plfxlc_mac_alloc_hw(intf);

	if (!hw) {
		r = -ENOMEM;
		goto error;
	}

	chip = &plfxlc_hw_mac(hw)->chip;
	usb = &chip->usb;
	usb->ez_usb = intf;
	tx = &usb->tx;

	r = plfxlc_upload_mac_and_serial(intf, hw_address, serial_number);
	if (r) {
		dev_err(&intf->dev, "MAC and Serial upload failed (%d)\n", r);
		goto error;
	}

	chip->unit_type = STA;
	dev_err(&intf->dev, "Unit type is station");

	r = plfxlc_mac_preinit_hw(hw, hw_address);
	if (r) {
		dev_err(&intf->dev, "Init mac failed (%d)\n", r);
		goto error;
	}

	r = ieee80211_register_hw(hw);
	if (r) {
		dev_err(&intf->dev, "Register device failed (%d)\n", r);
		goto error;
	}

	if ((le16_to_cpu(interface_to_usbdev(intf)->descriptor.idVendor) ==
				PURELIFI_XL_VENDOR_ID_0) &&
	    (le16_to_cpu(interface_to_usbdev(intf)->descriptor.idProduct) ==
				PURELIFI_XL_PRODUCT_ID_0)) {
		r = plfxlc_download_xl_firmware(intf);
	} else {
		r = plfxlc_download_fpga(intf);
	}
	if (r != 0) {
		dev_err(&intf->dev, "FPGA download failed (%d)\n", r);
		goto error;
	}

	tx->mac_fifo_full = 0;
	spin_lock_init(&tx->lock);

	msleep(PLF_MSLEEP_TIME);
	r = plfxlc_usb_init_hw(usb);
	if (r < 0) {
		dev_err(&intf->dev, "usb_init_hw failed (%d)\n", r);
		goto error;
	}

	msleep(PLF_MSLEEP_TIME);
	r = plfxlc_chip_switch_radio(chip, PLFXLC_RADIO_ON);
	if (r < 0) {
		dev_dbg(&intf->dev, "chip_switch_radio_on failed (%d)\n", r);
		goto error;
	}

	msleep(PLF_MSLEEP_TIME);
	r = plfxlc_chip_set_rate(chip, 8);
	if (r < 0) {
		dev_dbg(&intf->dev, "chip_set_rate failed (%d)\n", r);
		goto error;
	}

	msleep(PLF_MSLEEP_TIME);
	r = plfxlc_usb_wreq(usb->ez_usb,
			    hw_address, ETH_ALEN, USB_REQ_MAC_WR);
	if (r < 0) {
		dev_dbg(&intf->dev, "MAC_WR failure (%d)\n", r);
		goto error;
	}

	plfxlc_chip_enable_rxtx(chip);

	/* Initialise the data plane Tx queue */
	for (i = 0; i < MAX_STA_NUM; i++) {
		skb_queue_head_init(&tx->station[i].data_list);
		tx->station[i].flag = 0;
	}

	tx->station[STA_BROADCAST_INDEX].flag |= STATION_CONNECTED_FLAG;
	for (i = 0; i < ETH_ALEN; i++)
		tx->station[STA_BROADCAST_INDEX].mac[i] = 0xFF;

	timer_setup(&tx->tx_retry_timer, slif_data_plane_sap_timer_callb, 0);
	tx->tx_retry_timer.expires = jiffies + TX_RETRY_BACKOFF_JIFF;
	add_timer(&tx->tx_retry_timer);

	timer_setup(&usb->sta_queue_cleanup,
		    sta_queue_cleanup_timer_callb, 0);
	usb->sta_queue_cleanup.expires = jiffies + STA_QUEUE_CLEANUP_JIFF;
	add_timer(&usb->sta_queue_cleanup);

	plfxlc_mac_init_hw(hw);
	usb->initialized = true;
	return 0;
error:
	if (hw) {
		plfxlc_mac_release(plfxlc_hw_mac(hw));
		ieee80211_unregister_hw(hw);
		ieee80211_free_hw(hw);
	}
	dev_err(&intf->dev, "pureLifi:Device error");
	return r;
}

static void disconnect(struct usb_interface *intf)
{
	struct ieee80211_hw *hw = plfxlc_intf_to_hw(intf);
	struct plfxlc_mac *mac;
	struct plfxlc_usb *usb;

	/* Either something really bad happened, or
	 * we're just dealing with a DEVICE_INSTALLER.
	 */
	if (!hw)
		return;

	mac = plfxlc_hw_mac(hw);
	usb = &mac->chip.usb;

	del_timer_sync(&usb->tx.tx_retry_timer);
	del_timer_sync(&usb->sta_queue_cleanup);

	ieee80211_unregister_hw(hw);

	plfxlc_chip_disable_rxtx(&mac->chip);

	/* If the disconnect has been caused by a removal of the
	 * driver module, the reset allows reloading of the driver. If the
	 * reset will not be executed here, the upload of the firmware in the
	 * probe function caused by the reloading of the driver will fail.
	 */
	usb_reset_device(interface_to_usbdev(intf));

	plfxlc_mac_release(mac);
	ieee80211_free_hw(hw);
}

static void plfxlc_usb_resume(struct plfxlc_usb *usb)
{
	struct plfxlc_mac *mac = plfxlc_usb_to_mac(usb);
	int r;

	r = plfxlc_op_start(plfxlc_usb_to_hw(usb));
	if (r < 0) {
		dev_warn(plfxlc_usb_dev(usb),
			 "Device resume failed (%d)\n", r);

		if (usb->was_running)
			set_bit(PURELIFI_DEVICE_RUNNING, &mac->flags);

		usb_queue_reset_device(usb->intf);
		return;
	}

	if (mac->type != NL80211_IFTYPE_UNSPECIFIED) {
		r = plfxlc_restore_settings(mac);
		if (r < 0) {
			dev_dbg(plfxlc_usb_dev(usb),
				"Restore failed (%d)\n", r);
			return;
		}
	}
}

static void plfxlc_usb_stop(struct plfxlc_usb *usb)
{
	plfxlc_op_stop(plfxlc_usb_to_hw(usb));
	plfxlc_usb_disable_tx(usb);
	plfxlc_usb_disable_rx(usb);

	usb->initialized = false;
}

static int pre_reset(struct usb_interface *intf)
{
	struct ieee80211_hw *hw = usb_get_intfdata(intf);
	struct plfxlc_mac *mac;
	struct plfxlc_usb *usb;

	if (!hw || intf->condition != USB_INTERFACE_BOUND)
		return 0;

	mac = plfxlc_hw_mac(hw);
	usb = &mac->chip.usb;

	usb->was_running = test_bit(PURELIFI_DEVICE_RUNNING, &mac->flags);

	plfxlc_usb_stop(usb);

	return 0;
}

static int post_reset(struct usb_interface *intf)
{
	struct ieee80211_hw *hw = usb_get_intfdata(intf);
	struct plfxlc_mac *mac;
	struct plfxlc_usb *usb;

	if (!hw || intf->condition != USB_INTERFACE_BOUND)
		return 0;

	mac = plfxlc_hw_mac(hw);
	usb = &mac->chip.usb;

	if (usb->was_running)
		plfxlc_usb_resume(usb);

	return 0;
}

#ifdef CONFIG_PM

static struct plfxlc_usb *get_plfxlc_usb(struct usb_interface *intf)
{
	struct ieee80211_hw *hw = plfxlc_intf_to_hw(intf);
	struct plfxlc_mac *mac;

	/* Either something really bad happened, or
	 * we're just dealing with a DEVICE_INSTALLER.
	 */
	if (!hw)
		return NULL;

	mac = plfxlc_hw_mac(hw);
	return &mac->chip.usb;
}

static int suspend(struct usb_interface *interface,
		   pm_message_t message)
{
	struct plfxlc_usb *pl = get_plfxlc_usb(interface);
	struct plfxlc_mac *mac = plfxlc_usb_to_mac(pl);

	if (!pl)
		return -ENODEV;
	if (pl->initialized == 0)
		return 0;
	pl->was_running = test_bit(PURELIFI_DEVICE_RUNNING, &mac->flags);
	plfxlc_usb_stop(pl);
	return 0;
}

static int resume(struct usb_interface *interface)
{
	struct plfxlc_usb *pl = get_plfxlc_usb(interface);

	if (!pl)
		return -ENODEV;
	if (pl->was_running)
		plfxlc_usb_resume(pl);
	return 0;
}

#endif

static struct usb_driver driver = {
	.name = KBUILD_MODNAME,
	.id_table = usb_ids,
	.probe = probe,
	.disconnect = disconnect,
	.pre_reset = pre_reset,
	.post_reset = post_reset,
#ifdef CONFIG_PM
	.suspend = suspend,
	.resume = resume,
#endif
	.disable_hub_initiated_lpm = 1,
};

static int __init usb_init(void)
{
	int r;

	r = usb_register(&driver);
	if (r) {
		pr_err("%s usb_register() failed %d\n", driver.name, r);
		return r;
	}

	pr_debug("Driver initialized :%s\n", driver.name);
	return 0;
}

static void __exit usb_exit(void)
{
	usb_deregister(&driver);
	pr_debug("%s %s\n", driver.name, __func__);
}

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("USB driver for pureLiFi devices");
MODULE_AUTHOR("pureLiFi");
MODULE_VERSION("1.0");
MODULE_FIRMWARE("plfxlc/lifi-x.bin");
MODULE_DEVICE_TABLE(usb, usb_ids);

module_init(usb_init);
module_exit(usb_exit);