summaryrefslogtreecommitdiffstats
path: root/drivers/net/ieee802154/atusb.c
blob: 1253f864737ae3cfb10a95ee8c916b5c04dd94b6 (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
/*
 * atusb.c - Driver for the ATUSB IEEE 802.15.4 dongle
 *
 * Written 2013 by Werner Almesberger <werner@almesberger.net>
 *
 * Copyright (c) 2015 - 2016 Stefan Schmidt <stefan@datenfreihafen.org>
 *
 * 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, version 2
 *
 * Based on at86rf230.c and spi_atusb.c.
 * at86rf230.c is
 * Copyright (C) 2009 Siemens AG
 * Written by: Dmitry Eremin-Solenikov <dmitry.baryshkov@siemens.com>
 *
 * spi_atusb.c is
 * Copyright (c) 2011 Richard Sharpe <realrichardsharpe@gmail.com>
 * Copyright (c) 2011 Stefan Schmidt <stefan@datenfreihafen.org>
 * Copyright (c) 2011 Werner Almesberger <werner@almesberger.net>
 *
 * USB initialization is
 * Copyright (c) 2013 Alexander Aring <alex.aring@gmail.com>
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/usb.h>
#include <linux/skbuff.h>

#include <net/cfg802154.h>
#include <net/mac802154.h>

#include "at86rf230.h"
#include "atusb.h"

#define ATUSB_JEDEC_ATMEL	0x1f	/* JEDEC manufacturer ID */

#define ATUSB_NUM_RX_URBS	4	/* allow for a bit of local latency */
#define ATUSB_ALLOC_DELAY_MS	100	/* delay after failed allocation */
#define ATUSB_TX_TIMEOUT_MS	200	/* on the air timeout */

struct atusb {
	struct ieee802154_hw *hw;
	struct usb_device *usb_dev;
	int shutdown;			/* non-zero if shutting down */
	int err;			/* set by first error */

	/* RX variables */
	struct delayed_work work;	/* memory allocations */
	struct usb_anchor idle_urbs;	/* URBs waiting to be submitted */
	struct usb_anchor rx_urbs;	/* URBs waiting for reception */

	/* TX variables */
	struct usb_ctrlrequest tx_dr;
	struct urb *tx_urb;
	struct sk_buff *tx_skb;
	uint8_t tx_ack_seq;		/* current TX ACK sequence number */

	/* Firmware variable */
	unsigned char fw_ver_maj;	/* Firmware major version number */
	unsigned char fw_ver_min;	/* Firmware minor version number */
	unsigned char fw_hw_type;	/* Firmware hardware type */
};

/* ----- USB commands without data ----------------------------------------- */

/* To reduce the number of error checks in the code, we record the first error
 * in atusb->err and reject all subsequent requests until the error is cleared.
 */

static int atusb_control_msg(struct atusb *atusb, unsigned int pipe,
			     __u8 request, __u8 requesttype,
			     __u16 value, __u16 index,
			     void *data, __u16 size, int timeout)
{
	struct usb_device *usb_dev = atusb->usb_dev;
	int ret;

	if (atusb->err)
		return atusb->err;

	ret = usb_control_msg(usb_dev, pipe, request, requesttype,
			      value, index, data, size, timeout);
	if (ret < 0) {
		atusb->err = ret;
		dev_err(&usb_dev->dev,
			"atusb_control_msg: req 0x%02x val 0x%x idx 0x%x, error %d\n",
			request, value, index, ret);
	}
	return ret;
}

static int atusb_command(struct atusb *atusb, uint8_t cmd, uint8_t arg)
{
	struct usb_device *usb_dev = atusb->usb_dev;

	dev_dbg(&usb_dev->dev, "atusb_command: cmd = 0x%x\n", cmd);
	return atusb_control_msg(atusb, usb_sndctrlpipe(usb_dev, 0),
				 cmd, ATUSB_REQ_TO_DEV, arg, 0, NULL, 0, 1000);
}

static int atusb_write_reg(struct atusb *atusb, uint8_t reg, uint8_t value)
{
	struct usb_device *usb_dev = atusb->usb_dev;

	dev_dbg(&usb_dev->dev, "atusb_write_reg: 0x%02x <- 0x%02x\n",
		reg, value);
	return atusb_control_msg(atusb, usb_sndctrlpipe(usb_dev, 0),
				 ATUSB_REG_WRITE, ATUSB_REQ_TO_DEV,
				 value, reg, NULL, 0, 1000);
}

static int atusb_read_reg(struct atusb *atusb, uint8_t reg)
{
	struct usb_device *usb_dev = atusb->usb_dev;
	int ret;
	uint8_t value;

	dev_dbg(&usb_dev->dev, "atusb: reg = 0x%x\n", reg);
	ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
				ATUSB_REG_READ, ATUSB_REQ_FROM_DEV,
				0, reg, &value, 1, 1000);
	return ret >= 0 ? value : ret;
}

static int atusb_write_subreg(struct atusb *atusb, uint8_t reg, uint8_t mask,
			      uint8_t shift, uint8_t value)
{
	struct usb_device *usb_dev = atusb->usb_dev;
	uint8_t orig, tmp;
	int ret = 0;

	dev_dbg(&usb_dev->dev, "atusb_write_subreg: 0x%02x <- 0x%02x\n",
		reg, value);

	orig = atusb_read_reg(atusb, reg);

	/* Write the value only into that part of the register which is allowed
	 * by the mask. All other bits stay as before.
	 */
	tmp = orig & ~mask;
	tmp |= (value << shift) & mask;

	if (tmp != orig)
		ret = atusb_write_reg(atusb, reg, tmp);

	return ret;
}

static int atusb_get_and_clear_error(struct atusb *atusb)
{
	int err = atusb->err;

	atusb->err = 0;
	return err;
}

/* ----- skb allocation ---------------------------------------------------- */

#define MAX_PSDU	127
#define MAX_RX_XFER	(1 + MAX_PSDU + 2 + 1)	/* PHR+PSDU+CRC+LQI */

#define SKB_ATUSB(skb)	(*(struct atusb **)(skb)->cb)

static void atusb_in(struct urb *urb);

static int atusb_submit_rx_urb(struct atusb *atusb, struct urb *urb)
{
	struct usb_device *usb_dev = atusb->usb_dev;
	struct sk_buff *skb = urb->context;
	int ret;

	if (!skb) {
		skb = alloc_skb(MAX_RX_XFER, GFP_KERNEL);
		if (!skb) {
			dev_warn_ratelimited(&usb_dev->dev,
					     "atusb_in: can't allocate skb\n");
			return -ENOMEM;
		}
		skb_put(skb, MAX_RX_XFER);
		SKB_ATUSB(skb) = atusb;
	}

	usb_fill_bulk_urb(urb, usb_dev, usb_rcvbulkpipe(usb_dev, 1),
			  skb->data, MAX_RX_XFER, atusb_in, skb);
	usb_anchor_urb(urb, &atusb->rx_urbs);

	ret = usb_submit_urb(urb, GFP_KERNEL);
	if (ret) {
		usb_unanchor_urb(urb);
		kfree_skb(skb);
		urb->context = NULL;
	}
	return ret;
}

static void atusb_work_urbs(struct work_struct *work)
{
	struct atusb *atusb =
	    container_of(to_delayed_work(work), struct atusb, work);
	struct usb_device *usb_dev = atusb->usb_dev;
	struct urb *urb;
	int ret;

	if (atusb->shutdown)
		return;

	do {
		urb = usb_get_from_anchor(&atusb->idle_urbs);
		if (!urb)
			return;
		ret = atusb_submit_rx_urb(atusb, urb);
	} while (!ret);

	usb_anchor_urb(urb, &atusb->idle_urbs);
	dev_warn_ratelimited(&usb_dev->dev,
			     "atusb_in: can't allocate/submit URB (%d)\n", ret);
	schedule_delayed_work(&atusb->work,
			      msecs_to_jiffies(ATUSB_ALLOC_DELAY_MS) + 1);
}

/* ----- Asynchronous USB -------------------------------------------------- */

static void atusb_tx_done(struct atusb *atusb, uint8_t seq)
{
	struct usb_device *usb_dev = atusb->usb_dev;
	uint8_t expect = atusb->tx_ack_seq;

	dev_dbg(&usb_dev->dev, "atusb_tx_done (0x%02x/0x%02x)\n", seq, expect);
	if (seq == expect) {
		/* TODO check for ifs handling in firmware */
		ieee802154_xmit_complete(atusb->hw, atusb->tx_skb, false);
	} else {
		/* TODO I experience this case when atusb has a tx complete
		 * irq before probing, we should fix the firmware it's an
		 * unlikely case now that seq == expect is then true, but can
		 * happen and fail with a tx_skb = NULL;
		 */
		ieee802154_wake_queue(atusb->hw);
		if (atusb->tx_skb)
			dev_kfree_skb_irq(atusb->tx_skb);
	}
}

static void atusb_in_good(struct urb *urb)
{
	struct usb_device *usb_dev = urb->dev;
	struct sk_buff *skb = urb->context;
	struct atusb *atusb = SKB_ATUSB(skb);
	uint8_t len, lqi;

	if (!urb->actual_length) {
		dev_dbg(&usb_dev->dev, "atusb_in: zero-sized URB ?\n");
		return;
	}

	len = *skb->data;

	if (urb->actual_length == 1) {
		atusb_tx_done(atusb, len);
		return;
	}

	if (len + 1 > urb->actual_length - 1) {
		dev_dbg(&usb_dev->dev, "atusb_in: frame len %d+1 > URB %u-1\n",
			len, urb->actual_length);
		return;
	}

	if (!ieee802154_is_valid_psdu_len(len)) {
		dev_dbg(&usb_dev->dev, "atusb_in: frame corrupted\n");
		return;
	}

	lqi = skb->data[len + 1];
	dev_dbg(&usb_dev->dev, "atusb_in: rx len %d lqi 0x%02x\n", len, lqi);
	skb_pull(skb, 1);	/* remove PHR */
	skb_trim(skb, len);	/* get payload only */
	ieee802154_rx_irqsafe(atusb->hw, skb, lqi);
	urb->context = NULL;	/* skb is gone */
}

static void atusb_in(struct urb *urb)
{
	struct usb_device *usb_dev = urb->dev;
	struct sk_buff *skb = urb->context;
	struct atusb *atusb = SKB_ATUSB(skb);

	dev_dbg(&usb_dev->dev, "atusb_in: status %d len %d\n",
		urb->status, urb->actual_length);
	if (urb->status) {
		if (urb->status == -ENOENT) { /* being killed */
			kfree_skb(skb);
			urb->context = NULL;
			return;
		}
		dev_dbg(&usb_dev->dev, "atusb_in: URB error %d\n", urb->status);
	} else {
		atusb_in_good(urb);
	}

	usb_anchor_urb(urb, &atusb->idle_urbs);
	if (!atusb->shutdown)
		schedule_delayed_work(&atusb->work, 0);
}

/* ----- URB allocation/deallocation --------------------------------------- */

static void atusb_free_urbs(struct atusb *atusb)
{
	struct urb *urb;

	while (1) {
		urb = usb_get_from_anchor(&atusb->idle_urbs);
		if (!urb)
			break;
		kfree_skb(urb->context);
		usb_free_urb(urb);
	}
}

static int atusb_alloc_urbs(struct atusb *atusb, int n)
{
	struct urb *urb;

	while (n) {
		urb = usb_alloc_urb(0, GFP_KERNEL);
		if (!urb) {
			atusb_free_urbs(atusb);
			return -ENOMEM;
		}
		usb_anchor_urb(urb, &atusb->idle_urbs);
		n--;
	}
	return 0;
}

/* ----- IEEE 802.15.4 interface operations -------------------------------- */

static void atusb_xmit_complete(struct urb *urb)
{
	dev_dbg(&urb->dev->dev, "atusb_xmit urb completed");
}

static int atusb_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
{
	struct atusb *atusb = hw->priv;
	struct usb_device *usb_dev = atusb->usb_dev;
	int ret;

	dev_dbg(&usb_dev->dev, "atusb_xmit (%d)\n", skb->len);
	atusb->tx_skb = skb;
	atusb->tx_ack_seq++;
	atusb->tx_dr.wIndex = cpu_to_le16(atusb->tx_ack_seq);
	atusb->tx_dr.wLength = cpu_to_le16(skb->len);

	usb_fill_control_urb(atusb->tx_urb, usb_dev,
			     usb_sndctrlpipe(usb_dev, 0),
			     (unsigned char *)&atusb->tx_dr, skb->data,
			     skb->len, atusb_xmit_complete, NULL);
	ret = usb_submit_urb(atusb->tx_urb, GFP_ATOMIC);
	dev_dbg(&usb_dev->dev, "atusb_xmit done (%d)\n", ret);
	return ret;
}

static int atusb_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
{
	struct atusb *atusb = hw->priv;
	int ret;

	ret = atusb_write_subreg(atusb, SR_CHANNEL, channel);
	if (ret < 0)
		return ret;
	msleep(1);	/* @@@ ugly synchronization */
	return 0;
}

static int atusb_ed(struct ieee802154_hw *hw, u8 *level)
{
	BUG_ON(!level);
	*level = 0xbe;
	return 0;
}

static int atusb_set_hw_addr_filt(struct ieee802154_hw *hw,
				  struct ieee802154_hw_addr_filt *filt,
				  unsigned long changed)
{
	struct atusb *atusb = hw->priv;
	struct device *dev = &atusb->usb_dev->dev;

	if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
		u16 addr = le16_to_cpu(filt->short_addr);

		dev_vdbg(dev, "atusb_set_hw_addr_filt called for saddr\n");
		atusb_write_reg(atusb, RG_SHORT_ADDR_0, addr);
		atusb_write_reg(atusb, RG_SHORT_ADDR_1, addr >> 8);
	}

	if (changed & IEEE802154_AFILT_PANID_CHANGED) {
		u16 pan = le16_to_cpu(filt->pan_id);

		dev_vdbg(dev, "atusb_set_hw_addr_filt called for pan id\n");
		atusb_write_reg(atusb, RG_PAN_ID_0, pan);
		atusb_write_reg(atusb, RG_PAN_ID_1, pan >> 8);
	}

	if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
		u8 i, addr[IEEE802154_EXTENDED_ADDR_LEN];

		memcpy(addr, &filt->ieee_addr, IEEE802154_EXTENDED_ADDR_LEN);
		dev_vdbg(dev, "atusb_set_hw_addr_filt called for IEEE addr\n");
		for (i = 0; i < 8; i++)
			atusb_write_reg(atusb, RG_IEEE_ADDR_0 + i, addr[i]);
	}

	if (changed & IEEE802154_AFILT_PANC_CHANGED) {
		dev_vdbg(dev,
			 "atusb_set_hw_addr_filt called for panc change\n");
		if (filt->pan_coord)
			atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 1);
		else
			atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 0);
	}

	return atusb_get_and_clear_error(atusb);
}

static int atusb_start(struct ieee802154_hw *hw)
{
	struct atusb *atusb = hw->priv;
	struct usb_device *usb_dev = atusb->usb_dev;
	int ret;

	dev_dbg(&usb_dev->dev, "atusb_start\n");
	schedule_delayed_work(&atusb->work, 0);
	atusb_command(atusb, ATUSB_RX_MODE, 1);
	ret = atusb_get_and_clear_error(atusb);
	if (ret < 0)
		usb_kill_anchored_urbs(&atusb->idle_urbs);
	return ret;
}

static void atusb_stop(struct ieee802154_hw *hw)
{
	struct atusb *atusb = hw->priv;
	struct usb_device *usb_dev = atusb->usb_dev;

	dev_dbg(&usb_dev->dev, "atusb_stop\n");
	usb_kill_anchored_urbs(&atusb->idle_urbs);
	atusb_command(atusb, ATUSB_RX_MODE, 0);
	atusb_get_and_clear_error(atusb);
}

#define ATUSB_MAX_TX_POWERS 0xF
static const s32 atusb_powers[ATUSB_MAX_TX_POWERS + 1] = {
	300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
	-900, -1200, -1700,
};

static int
atusb_set_txpower(struct ieee802154_hw *hw, s32 mbm)
{
	struct atusb *atusb = hw->priv;
	u32 i;

	for (i = 0; i < hw->phy->supported.tx_powers_size; i++) {
		if (hw->phy->supported.tx_powers[i] == mbm)
			return atusb_write_subreg(atusb, SR_TX_PWR_23X, i);
	}

	return -EINVAL;
}

#define ATUSB_MAX_ED_LEVELS 0xF
static const s32 atusb_ed_levels[ATUSB_MAX_ED_LEVELS + 1] = {
	-9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
	-7100, -6900, -6700, -6500, -6300, -6100,
};

static int
atusb_set_cca_mode(struct ieee802154_hw *hw, const struct wpan_phy_cca *cca)
{
	struct atusb *atusb = hw->priv;
	u8 val;

	/* mapping 802.15.4 to driver spec */
	switch (cca->mode) {
	case NL802154_CCA_ENERGY:
		val = 1;
		break;
	case NL802154_CCA_CARRIER:
		val = 2;
		break;
	case NL802154_CCA_ENERGY_CARRIER:
		switch (cca->opt) {
		case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
			val = 3;
			break;
		case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
			val = 0;
			break;
		default:
			return -EINVAL;
		}
		break;
	default:
		return -EINVAL;
	}

	return atusb_write_subreg(atusb, SR_CCA_MODE, val);
}

static int
atusb_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
{
	struct atusb *atusb = hw->priv;
	u32 i;

	for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
		if (hw->phy->supported.cca_ed_levels[i] == mbm)
			return atusb_write_subreg(atusb, SR_CCA_ED_THRES, i);
	}

	return -EINVAL;
}

static int
atusb_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be, u8 retries)
{
	struct atusb *atusb = hw->priv;
	int ret;

	ret = atusb_write_subreg(atusb, SR_MIN_BE, min_be);
	if (ret)
		return ret;

	ret = atusb_write_subreg(atusb, SR_MAX_BE, max_be);
	if (ret)
		return ret;

	return atusb_write_subreg(atusb, SR_MAX_CSMA_RETRIES, retries);
}

static int
atusb_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
{
	struct atusb *atusb = hw->priv;
	struct device *dev = &atusb->usb_dev->dev;

	if (atusb->fw_ver_maj == 0 && atusb->fw_ver_min < 3) {
		dev_info(dev, "Automatic frame retransmission is only available from "
			"firmware version 0.3. Please update if you want this feature.");
		return -EINVAL;
	}

	return atusb_write_subreg(atusb, SR_MAX_FRAME_RETRIES, retries);
}

static int
atusb_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
{
	struct atusb *atusb = hw->priv;
	int ret;

	if (on) {
		ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 1);
		if (ret < 0)
			return ret;

		ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 1);
		if (ret < 0)
			return ret;
	} else {
		ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 0);
		if (ret < 0)
			return ret;

		ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 0);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static const struct ieee802154_ops atusb_ops = {
	.owner			= THIS_MODULE,
	.xmit_async		= atusb_xmit,
	.ed			= atusb_ed,
	.set_channel		= atusb_channel,
	.start			= atusb_start,
	.stop			= atusb_stop,
	.set_hw_addr_filt	= atusb_set_hw_addr_filt,
	.set_txpower		= atusb_set_txpower,
	.set_cca_mode		= atusb_set_cca_mode,
	.set_cca_ed_level	= atusb_set_cca_ed_level,
	.set_csma_params	= atusb_set_csma_params,
	.set_frame_retries	= atusb_set_frame_retries,
	.set_promiscuous_mode	= atusb_set_promiscuous_mode,
};

/* ----- Firmware and chip version information ----------------------------- */

static int atusb_get_and_show_revision(struct atusb *atusb)
{
	struct usb_device *usb_dev = atusb->usb_dev;
	unsigned char buffer[3];
	int ret;

	/* Get a couple of the ATMega Firmware values */
	ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
				ATUSB_ID, ATUSB_REQ_FROM_DEV, 0, 0,
				buffer, 3, 1000);
	if (ret >= 0) {
		atusb->fw_ver_maj = buffer[0];
		atusb->fw_ver_min = buffer[1];
		atusb->fw_hw_type = buffer[2];

		dev_info(&usb_dev->dev,
			 "Firmware: major: %u, minor: %u, hardware type: %u\n",
			 atusb->fw_ver_maj, atusb->fw_ver_min, atusb->fw_hw_type);
	}
	if (atusb->fw_ver_maj == 0 && atusb->fw_ver_min < 2) {
		dev_info(&usb_dev->dev,
			 "Firmware version (%u.%u) predates our first public release.",
			 atusb->fw_ver_maj, atusb->fw_ver_min);
		dev_info(&usb_dev->dev, "Please update to version 0.2 or newer");
	}

	return ret;
}

static int atusb_get_and_show_build(struct atusb *atusb)
{
	struct usb_device *usb_dev = atusb->usb_dev;
	char build[ATUSB_BUILD_SIZE + 1];
	int ret;

	ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
				ATUSB_BUILD, ATUSB_REQ_FROM_DEV, 0, 0,
				build, ATUSB_BUILD_SIZE, 1000);
	if (ret >= 0) {
		build[ret] = 0;
		dev_info(&usb_dev->dev, "Firmware: build %s\n", build);
	}

	return ret;
}

static int atusb_get_and_show_chip(struct atusb *atusb)
{
	struct usb_device *usb_dev = atusb->usb_dev;
	uint8_t man_id_0, man_id_1, part_num, version_num;
	const char *chip;

	man_id_0 = atusb_read_reg(atusb, RG_MAN_ID_0);
	man_id_1 = atusb_read_reg(atusb, RG_MAN_ID_1);
	part_num = atusb_read_reg(atusb, RG_PART_NUM);
	version_num = atusb_read_reg(atusb, RG_VERSION_NUM);

	if (atusb->err)
		return atusb->err;

	if ((man_id_1 << 8 | man_id_0) != ATUSB_JEDEC_ATMEL) {
		dev_err(&usb_dev->dev,
			"non-Atmel transceiver xxxx%02x%02x\n",
			man_id_1, man_id_0);
		goto fail;
	}

	switch (part_num) {
	case 2:
		chip = "AT86RF230";
		break;
	case 3:
		chip = "AT86RF231";
		break;
	default:
		dev_err(&usb_dev->dev,
			"unexpected transceiver, part 0x%02x version 0x%02x\n",
			part_num, version_num);
		goto fail;
	}

	dev_info(&usb_dev->dev, "ATUSB: %s version %d\n", chip, version_num);

	return 0;

fail:
	atusb->err = -ENODEV;
	return -ENODEV;
}

static int atusb_set_extended_addr(struct atusb *atusb)
{
	struct usb_device *usb_dev = atusb->usb_dev;
	unsigned char buffer[IEEE802154_EXTENDED_ADDR_LEN];
	__le64 extended_addr;
	u64 addr;
	int ret;

	/* Firmware versions before 0.3 do not support the EUI64_READ command.
	 * Just use a random address and be done */
	if (atusb->fw_ver_maj == 0 && atusb->fw_ver_min < 3) {
		ieee802154_random_extended_addr(&atusb->hw->phy->perm_extended_addr);
		return 0;
	}

	/* Firmware is new enough so we fetch the address from EEPROM */
	ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
				ATUSB_EUI64_READ, ATUSB_REQ_FROM_DEV, 0, 0,
				buffer, IEEE802154_EXTENDED_ADDR_LEN, 1000);
	if (ret < 0)
		dev_err(&usb_dev->dev, "failed to fetch extended address\n");

	memcpy(&extended_addr, buffer, IEEE802154_EXTENDED_ADDR_LEN);
	/* Check if read address is not empty and the unicast bit is set correctly */
	if (!ieee802154_is_valid_extended_unicast_addr(extended_addr)) {
		dev_info(&usb_dev->dev, "no permanent extended address found, random address set\n");
		ieee802154_random_extended_addr(&atusb->hw->phy->perm_extended_addr);
	} else {
		atusb->hw->phy->perm_extended_addr = extended_addr;
		addr = swab64((__force u64)atusb->hw->phy->perm_extended_addr);
		dev_info(&usb_dev->dev, "Read permanent extended address %8phC from device\n",
			&addr);
	}

	return ret;
}

/* ----- Setup ------------------------------------------------------------- */

static int atusb_probe(struct usb_interface *interface,
		       const struct usb_device_id *id)
{
	struct usb_device *usb_dev = interface_to_usbdev(interface);
	struct ieee802154_hw *hw;
	struct atusb *atusb = NULL;
	int ret = -ENOMEM;

	hw = ieee802154_alloc_hw(sizeof(struct atusb), &atusb_ops);
	if (!hw)
		return -ENOMEM;

	atusb = hw->priv;
	atusb->hw = hw;
	atusb->usb_dev = usb_get_dev(usb_dev);
	usb_set_intfdata(interface, atusb);

	atusb->shutdown = 0;
	atusb->err = 0;
	INIT_DELAYED_WORK(&atusb->work, atusb_work_urbs);
	init_usb_anchor(&atusb->idle_urbs);
	init_usb_anchor(&atusb->rx_urbs);

	if (atusb_alloc_urbs(atusb, ATUSB_NUM_RX_URBS))
		goto fail;

	atusb->tx_dr.bRequestType = ATUSB_REQ_TO_DEV;
	atusb->tx_dr.bRequest = ATUSB_TX;
	atusb->tx_dr.wValue = cpu_to_le16(0);

	atusb->tx_urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!atusb->tx_urb)
		goto fail;

	hw->parent = &usb_dev->dev;
	hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
		    IEEE802154_HW_PROMISCUOUS | IEEE802154_HW_CSMA_PARAMS |
		    IEEE802154_HW_FRAME_RETRIES;

	hw->phy->flags = WPAN_PHY_FLAG_TXPOWER | WPAN_PHY_FLAG_CCA_ED_LEVEL |
			 WPAN_PHY_FLAG_CCA_MODE;

	hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
		BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
	hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
		BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);

	hw->phy->supported.cca_ed_levels = atusb_ed_levels;
	hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(atusb_ed_levels);

	hw->phy->cca.mode = NL802154_CCA_ENERGY;

	hw->phy->current_page = 0;
	hw->phy->current_channel = 11;	/* reset default */
	hw->phy->supported.channels[0] = 0x7FFF800;
	hw->phy->supported.tx_powers = atusb_powers;
	hw->phy->supported.tx_powers_size = ARRAY_SIZE(atusb_powers);
	hw->phy->transmit_power = hw->phy->supported.tx_powers[0];
	hw->phy->cca_ed_level = hw->phy->supported.cca_ed_levels[7];

	atusb_command(atusb, ATUSB_RF_RESET, 0);
	atusb_get_and_show_chip(atusb);
	atusb_get_and_show_revision(atusb);
	atusb_get_and_show_build(atusb);
	atusb_set_extended_addr(atusb);

	ret = atusb_get_and_clear_error(atusb);
	if (ret) {
		dev_err(&atusb->usb_dev->dev,
			"%s: initialization failed, error = %d\n",
			__func__, ret);
		goto fail;
	}

	ret = ieee802154_register_hw(hw);
	if (ret)
		goto fail;

	/* If we just powered on, we're now in P_ON and need to enter TRX_OFF
	 * explicitly. Any resets after that will send us straight to TRX_OFF,
	 * making the command below redundant.
	 */
	atusb_write_reg(atusb, RG_TRX_STATE, STATE_FORCE_TRX_OFF);
	msleep(1);	/* reset => TRX_OFF, tTR13 = 37 us */

#if 0
	/* Calculating the maximum time available to empty the frame buffer
	 * on reception:
	 *
	 * According to [1], the inter-frame gap is
	 * R * 20 * 16 us + 128 us
	 * where R is a random number from 0 to 7. Furthermore, we have 20 bit
	 * times (80 us at 250 kbps) of SHR of the next frame before the
	 * transceiver begins storing data in the frame buffer.
	 *
	 * This yields a minimum time of 208 us between the last data of a
	 * frame and the first data of the next frame. This time is further
	 * reduced by interrupt latency in the atusb firmware.
	 *
	 * atusb currently needs about 500 us to retrieve a maximum-sized
	 * frame. We therefore have to allow reception of a new frame to begin
	 * while we retrieve the previous frame.
	 *
	 * [1] "JN-AN-1035 Calculating data rates in an IEEE 802.15.4-based
	 *      network", Jennic 2006.
	 *     http://www.jennic.com/download_file.php?supportFile=JN-AN-1035%20Calculating%20802-15-4%20Data%20Rates-1v0.pdf
	 */

	atusb_write_subreg(atusb, SR_RX_SAFE_MODE, 1);
#endif
	atusb_write_reg(atusb, RG_IRQ_MASK, 0xff);

	ret = atusb_get_and_clear_error(atusb);
	if (!ret)
		return 0;

	dev_err(&atusb->usb_dev->dev,
		"%s: setup failed, error = %d\n",
		__func__, ret);

	ieee802154_unregister_hw(hw);
fail:
	atusb_free_urbs(atusb);
	usb_kill_urb(atusb->tx_urb);
	usb_free_urb(atusb->tx_urb);
	usb_put_dev(usb_dev);
	ieee802154_free_hw(hw);
	return ret;
}

static void atusb_disconnect(struct usb_interface *interface)
{
	struct atusb *atusb = usb_get_intfdata(interface);

	dev_dbg(&atusb->usb_dev->dev, "atusb_disconnect\n");

	atusb->shutdown = 1;
	cancel_delayed_work_sync(&atusb->work);

	usb_kill_anchored_urbs(&atusb->rx_urbs);
	atusb_free_urbs(atusb);
	usb_kill_urb(atusb->tx_urb);
	usb_free_urb(atusb->tx_urb);

	ieee802154_unregister_hw(atusb->hw);

	ieee802154_free_hw(atusb->hw);

	usb_set_intfdata(interface, NULL);
	usb_put_dev(atusb->usb_dev);

	pr_debug("atusb_disconnect done\n");
}

/* The devices we work with */
static const struct usb_device_id atusb_device_table[] = {
	{
		.match_flags		= USB_DEVICE_ID_MATCH_DEVICE |
					  USB_DEVICE_ID_MATCH_INT_INFO,
		.idVendor		= ATUSB_VENDOR_ID,
		.idProduct		= ATUSB_PRODUCT_ID,
		.bInterfaceClass	= USB_CLASS_VENDOR_SPEC
	},
	/* end with null element */
	{}
};
MODULE_DEVICE_TABLE(usb, atusb_device_table);

static struct usb_driver atusb_driver = {
	.name		= "atusb",
	.probe		= atusb_probe,
	.disconnect	= atusb_disconnect,
	.id_table	= atusb_device_table,
};
module_usb_driver(atusb_driver);

MODULE_AUTHOR("Alexander Aring <alex.aring@gmail.com>");
MODULE_AUTHOR("Richard Sharpe <realrichardsharpe@gmail.com>");
MODULE_AUTHOR("Stefan Schmidt <stefan@datenfreihafen.org>");
MODULE_AUTHOR("Werner Almesberger <werner@almesberger.net>");
MODULE_DESCRIPTION("ATUSB IEEE 802.15.4 Driver");
MODULE_LICENSE("GPL");