aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/p54/eeprom.c
blob: 54cc0bba66b958ed88003b2cf256b76145c81d6a (plain) (blame)
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
/*
 * EEPROM parser code for mac80211 Prism54 drivers
 *
 * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
 * Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
 *
 * Based on:
 * - the islsm (softmac prism54) driver, which is:
 *   Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
 * - stlc45xx driver
 *   Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
 *
 * 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/firmware.h>
#include <linux/etherdevice.h>
#include <linux/sort.h>
#include <linux/slab.h>

#include <net/mac80211.h>
#include <linux/crc-ccitt.h>

#include "p54.h"
#include "eeprom.h"
#include "lmac.h"

static struct ieee80211_rate p54_bgrates[] = {
	{ .bitrate = 10, .hw_value = 0, },
	{ .bitrate = 20, .hw_value = 1, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 55, .hw_value = 2, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 110, .hw_value = 3, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 60, .hw_value = 4, },
	{ .bitrate = 90, .hw_value = 5, },
	{ .bitrate = 120, .hw_value = 6, },
	{ .bitrate = 180, .hw_value = 7, },
	{ .bitrate = 240, .hw_value = 8, },
	{ .bitrate = 360, .hw_value = 9, },
	{ .bitrate = 480, .hw_value = 10, },
	{ .bitrate = 540, .hw_value = 11, },
};

static struct ieee80211_rate p54_arates[] = {
	{ .bitrate = 60, .hw_value = 4, },
	{ .bitrate = 90, .hw_value = 5, },
	{ .bitrate = 120, .hw_value = 6, },
	{ .bitrate = 180, .hw_value = 7, },
	{ .bitrate = 240, .hw_value = 8, },
	{ .bitrate = 360, .hw_value = 9, },
	{ .bitrate = 480, .hw_value = 10, },
	{ .bitrate = 540, .hw_value = 11, },
};

static struct p54_rssi_db_entry p54_rssi_default = {
	/*
	 * The defaults are taken from usb-logs of the
	 * vendor driver. So, they should be safe to
	 * use in case we can't get a match from the
	 * rssi <-> dBm conversion database.
	 */
	.mul = 130,
	.add = -398,
};

#define CHAN_HAS_CAL		BIT(0)
#define CHAN_HAS_LIMIT		BIT(1)
#define CHAN_HAS_CURVE		BIT(2)
#define CHAN_HAS_ALL		(CHAN_HAS_CAL | CHAN_HAS_LIMIT | CHAN_HAS_CURVE)

struct p54_channel_entry {
	u16 freq;
	u16 data;
	int index;
	enum ieee80211_band band;
};

struct p54_channel_list {
	struct p54_channel_entry *channels;
	size_t entries;
	size_t max_entries;
	size_t band_channel_num[IEEE80211_NUM_BANDS];
};

static int p54_get_band_from_freq(u16 freq)
{
	/* FIXME: sync these values with the 802.11 spec */

	if ((freq >= 2412) && (freq <= 2484))
		return IEEE80211_BAND_2GHZ;

	if ((freq >= 4920) && (freq <= 5825))
		return IEEE80211_BAND_5GHZ;

	return -1;
}

static int same_band(u16 freq, u16 freq2)
{
	return p54_get_band_from_freq(freq) == p54_get_band_from_freq(freq2);
}

static int p54_compare_channels(const void *_a,
				const void *_b)
{
	const struct p54_channel_entry *a = _a;
	const struct p54_channel_entry *b = _b;

	return a->freq - b->freq;
}

static int p54_compare_rssichan(const void *_a,
				const void *_b)
{
	const struct p54_rssi_db_entry *a = _a;
	const struct p54_rssi_db_entry *b = _b;

	return a->freq - b->freq;
}

static int p54_fill_band_bitrates(struct ieee80211_hw *dev,
				  struct ieee80211_supported_band *band_entry,
				  enum ieee80211_band band)
{
	/* TODO: generate rate array dynamically */

	switch (band) {
	case IEEE80211_BAND_2GHZ:
		band_entry->bitrates = p54_bgrates;
		band_entry->n_bitrates = ARRAY_SIZE(p54_bgrates);
		break;
	case IEEE80211_BAND_5GHZ:
		band_entry->bitrates = p54_arates;
		band_entry->n_bitrates = ARRAY_SIZE(p54_arates);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int p54_generate_band(struct ieee80211_hw *dev,
			     struct p54_channel_list *list,
			     enum ieee80211_band band)
{
	struct p54_common *priv = dev->priv;
	struct ieee80211_supported_band *tmp, *old;
	unsigned int i, j;
	int ret = -ENOMEM;

	if ((!list->entries) || (!list->band_channel_num[band]))
		return -EINVAL;

	tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
	if (!tmp)
		goto err_out;

	tmp->channels = kzalloc(sizeof(struct ieee80211_channel) *
				list->band_channel_num[band], GFP_KERNEL);
	if (!tmp->channels)
		goto err_out;

	ret = p54_fill_band_bitrates(dev, tmp, band);
	if (ret)
		goto err_out;

	for (i = 0, j = 0; (j < list->band_channel_num[band]) &&
			   (i < list->entries); i++) {
		struct p54_channel_entry *chan = &list->channels[i];

		if (chan->band != band)
			continue;

		if (chan->data != CHAN_HAS_ALL) {
			wiphy_err(dev->wiphy, "%s%s%s is/are missing for "
				  "channel:%d [%d MHz].\n",
				  (chan->data & CHAN_HAS_CAL ? "" :
				   " [iqauto calibration data]"),
				  (chan->data & CHAN_HAS_LIMIT ? "" :
				   " [output power limits]"),
				  (chan->data & CHAN_HAS_CURVE ? "" :
				   " [curve data]"),
				  chan->index, chan->freq);
			continue;
		}

		tmp->channels[j].band = chan->band;
		tmp->channels[j].center_freq = chan->freq;
		j++;
	}

	if (j == 0) {
		wiphy_err(dev->wiphy, "Disabling totally damaged %d GHz band\n",
			  (band == IEEE80211_BAND_2GHZ) ? 2 : 5);

		ret = -ENODATA;
		goto err_out;
	}

	tmp->n_channels = j;
	old = priv->band_table[band];
	priv->band_table[band] = tmp;
	if (old) {
		kfree(old->channels);
		kfree(old);
	}

	return 0;

err_out:
	if (tmp) {
		kfree(tmp->channels);
		kfree(tmp);
	}

	return ret;
}

static void p54_update_channel_param(struct p54_channel_list *list,
				     u16 freq, u16 data)
{
	int band, i;

	/*
	 * usually all lists in the eeprom are mostly sorted.
	 * so it's very likely that the entry we are looking for
	 * is right at the end of the list
	 */
	for (i = list->entries; i >= 0; i--) {
		if (freq == list->channels[i].freq) {
			list->channels[i].data |= data;
			break;
		}
	}

	if ((i < 0) && (list->entries < list->max_entries)) {
		/* entry does not exist yet. Initialize a new one. */
		band = p54_get_band_from_freq(freq);

		/*
		 * filter out frequencies which don't belong into
		 * any supported band.
		 */
		if (band < 0)
			return ;

		i = list->entries++;
		list->band_channel_num[band]++;

		list->channels[i].freq = freq;
		list->channels[i].data = data;
		list->channels[i].band = band;
		list->channels[i].index = ieee80211_frequency_to_channel(freq);
		/* TODO: parse output_limit and fill max_power */
	}
}

static int p54_generate_channel_lists(struct ieee80211_hw *dev)
{
	struct p54_common *priv = dev->priv;
	struct p54_channel_list *list;
	unsigned int i, j, max_channel_num;
	int ret = 0;
	u16 freq;

	if ((priv->iq_autocal_len != priv->curve_data->entries) ||
	    (priv->iq_autocal_len != priv->output_limit->entries))
		wiphy_err(dev->wiphy,
			  "Unsupported or damaged EEPROM detected. "
			  "You may not be able to use all channels.\n");

	max_channel_num = max_t(unsigned int, priv->output_limit->entries,
				priv->iq_autocal_len);
	max_channel_num = max_t(unsigned int, max_channel_num,
				priv->curve_data->entries);

	list = kzalloc(sizeof(*list), GFP_KERNEL);
	if (!list) {
		ret = -ENOMEM;
		goto free;
	}

	list->max_entries = max_channel_num;
	list->channels = kzalloc(sizeof(struct p54_channel_entry) *
				 max_channel_num, GFP_KERNEL);
	if (!list->channels) {
		ret = -ENOMEM;
		goto free;
	}

	for (i = 0; i < max_channel_num; i++) {
		if (i < priv->iq_autocal_len) {
			freq = le16_to_cpu(priv->iq_autocal[i].freq);
			p54_update_channel_param(list, freq, CHAN_HAS_CAL);
		}

		if (i < priv->output_limit->entries) {
			freq = le16_to_cpup((__le16 *) (i *
					    priv->output_limit->entry_size +
					    priv->output_limit->offset +
					    priv->output_limit->data));

			p54_update_channel_param(list, freq, CHAN_HAS_LIMIT);
		}

		if (i < priv->curve_data->entries) {
			freq = le16_to_cpup((__le16 *) (i *
					    priv->curve_data->entry_size +
					    priv->curve_data->offset +
					    priv->curve_data->data));

			p54_update_channel_param(list, freq, CHAN_HAS_CURVE);
		}
	}

	/* sort the channel list by frequency */
	sort(list->channels, list->entries, sizeof(struct p54_channel_entry),
	     p54_compare_channels, NULL);

	for (i = 0, j = 0; i < IEEE80211_NUM_BANDS; i++) {
		if (p54_generate_band(dev, list, i) == 0)
			j++;
	}
	if (j == 0) {
		/* no useable band available. */
		ret = -EINVAL;
	}

free:
	if (list) {
		kfree(list->channels);
		kfree(list);
	}

	return ret;
}

static int p54_convert_rev0(struct ieee80211_hw *dev,
			    struct pda_pa_curve_data *curve_data)
{
	struct p54_common *priv = dev->priv;
	struct p54_pa_curve_data_sample *dst;
	struct pda_pa_curve_data_sample_rev0 *src;
	size_t cd_len = sizeof(*curve_data) +
		(curve_data->points_per_channel*sizeof(*dst) + 2) *
		 curve_data->channels;
	unsigned int i, j;
	void *source, *target;

	priv->curve_data = kmalloc(sizeof(*priv->curve_data) + cd_len,
				   GFP_KERNEL);
	if (!priv->curve_data)
		return -ENOMEM;

	priv->curve_data->entries = curve_data->channels;
	priv->curve_data->entry_size = sizeof(__le16) +
		sizeof(*dst) * curve_data->points_per_channel;
	priv->curve_data->offset = offsetof(struct pda_pa_curve_data, data);
	priv->curve_data->len = cd_len;
	memcpy(priv->curve_data->data, curve_data, sizeof(*curve_data));
	source = curve_data->data;
	target = ((struct pda_pa_curve_data *) priv->curve_data->data)->data;
	for (i = 0; i < curve_data->channels; i++) {
		__le16 *freq = source;
		source += sizeof(__le16);
		*((__le16 *)target) = *freq;
		target += sizeof(__le16);
		for (j = 0; j < curve_data->points_per_channel; j++) {
			dst = target;
			src = source;

			dst->rf_power = src->rf_power;
			dst->pa_detector = src->pa_detector;
			dst->data_64qam = src->pcv;
			/* "invent" the points for the other modulations */
#define SUB(x, y) (u8)(((x) - (y)) > (x) ? 0 : (x) - (y))
			dst->data_16qam = SUB(src->pcv, 12);
			dst->data_qpsk = SUB(dst->data_16qam, 12);
			dst->data_bpsk = SUB(dst->data_qpsk, 12);
			dst->data_barker = SUB(dst->data_bpsk, 14);
#undef SUB
			target += sizeof(*dst);
			source += sizeof(*src);
		}
	}

	return 0;
}

static int p54_convert_rev1(struct ieee80211_hw *dev,
			    struct pda_pa_curve_data *curve_data)
{
	struct p54_common *priv = dev->priv;
	struct p54_pa_curve_data_sample *dst;
	struct pda_pa_curve_data_sample_rev1 *src;
	size_t cd_len = sizeof(*curve_data) +
		(curve_data->points_per_channel*sizeof(*dst) + 2) *
		 curve_data->channels;
	unsigned int i, j;
	void *source, *target;

	priv->curve_data = kzalloc(cd_len + sizeof(*priv->curve_data),
				   GFP_KERNEL);
	if (!priv->curve_data)
		return -ENOMEM;

	priv->curve_data->entries = curve_data->channels;
	priv->curve_data->entry_size = sizeof(__le16) +
		sizeof(*dst) * curve_data->points_per_channel;
	priv->curve_data->offset = offsetof(struct pda_pa_curve_data, data);
	priv->curve_data->len = cd_len;
	memcpy(priv->curve_data->data, curve_data, sizeof(*curve_data));
	source = curve_data->data;
	target = ((struct pda_pa_curve_data *) priv->curve_data->data)->data;
	for (i = 0; i < curve_data->channels; i++) {
		__le16 *freq = source;
		source += sizeof(__le16);
		*((__le16 *)target) = *freq;
		target += sizeof(__le16);
		for (j = 0; j < curve_data->points_per_channel; j++) {
			memcpy(target, source, sizeof(*src));

			target += sizeof(*dst);
			source += sizeof(*src);
		}
		source++;
	}

	return 0;
}

static const char *p54_rf_chips[] = { "INVALID-0", "Duette3", "Duette2",
	"Frisbee", "Xbow", "Longbow", "INVALID-6", "INVALID-7" };

static int p54_parse_rssical(struct ieee80211_hw *dev,
			     u8 *data, int len, u16 type)
{
	struct p54_common *priv = dev->priv;
	struct p54_rssi_db_entry *entry;
	size_t db_len, entries;
	int offset = 0, i;

	if (type != PDR_RSSI_LINEAR_APPROXIMATION_EXTENDED) {
		entries = (type == PDR_RSSI_LINEAR_APPROXIMATION) ? 1 : 2;
		if (len != sizeof(struct pda_rssi_cal_entry) * entries) {
			wiphy_err(dev->wiphy, "rssical size mismatch.\n");
			goto err_data;
		}
	} else {
		/*
		 * Some devices (Dell 1450 USB, Xbow 5GHz card, etc...)
		 * have an empty two byte header.
		 */
		if (*((__le16 *)&data[offset]) == cpu_to_le16(0))
			offset += 2;

		entries = (len - offset) /
			sizeof(struct pda_rssi_cal_ext_entry);

		if ((len - offset) % sizeof(struct pda_rssi_cal_ext_entry) ||
		    entries <= 0) {
			wiphy_err(dev->wiphy, "invalid rssi database.\n");
			goto err_data;
		}
	}

	db_len = sizeof(*entry) * entries;
	priv->rssi_db = kzalloc(db_len + sizeof(*priv->rssi_db), GFP_KERNEL);
	if (!priv->rssi_db)
		return -ENOMEM;

	priv->rssi_db->offset = 0;
	priv->rssi_db->entries = entries;
	priv->rssi_db->entry_size = sizeof(*entry);
	priv->rssi_db->len = db_len;

	entry = (void *)((unsigned long)priv->rssi_db->data + priv->rssi_db->offset);
	if (type == PDR_RSSI_LINEAR_APPROXIMATION_EXTENDED) {
		struct pda_rssi_cal_ext_entry *cal = (void *) &data[offset];

		for (i = 0; i < entries; i++) {
			entry[i].freq = le16_to_cpu(cal[i].freq);
			entry[i].mul = (s16) le16_to_cpu(cal[i].mul);
			entry[i].add = (s16) le16_to_cpu(cal[i].add);
		}
	} else {
		struct pda_rssi_cal_entry *cal = (void *) &data[offset];

		for (i = 0; i < entries; i++) {
			u16 freq = 0;
			switch (i) {
			case IEEE80211_BAND_2GHZ:
				freq = 2437;
				break;
			case IEEE80211_BAND_5GHZ:
				freq = 5240;
				break;
			}

			entry[i].freq = freq;
			entry[i].mul = (s16) le16_to_cpu(cal[i].mul);
			entry[i].add = (s16) le16_to_cpu(cal[i].add);
		}
	}

	/* sort the list by channel frequency */
	sort(entry, entries, sizeof(*entry), p54_compare_rssichan, NULL);
	return 0;

err_data:
	wiphy_err(dev->wiphy,
		  "rssi calibration data packing type:(%x) len:%d.\n",
		  type, len);

	print_hex_dump_bytes("rssical:", DUMP_PREFIX_NONE, data, len);

	wiphy_err(dev->wiphy, "please report this issue.\n");
	return -EINVAL;
}

struct p54_rssi_db_entry *p54_rssi_find(struct p54_common *priv, const u16 freq)
{
	struct p54_rssi_db_entry *entry;
	int i, found = -1;

	if (!priv->rssi_db)
		return &p54_rssi_default;

	entry = (void *)(priv->rssi_db->data + priv->rssi_db->offset);
	for (i = 0; i < priv->rssi_db->entries; i++) {
		if (!same_band(freq, entry[i].freq))
			continue;

		if (found == -1) {
			found = i;
			continue;
		}

		/* nearest match */
		if (abs(freq - entry[i].freq) <
		    abs(freq - entry[found].freq)) {
			found = i;
			continue;
		} else {
			break;
		}
	}

	return found < 0 ? &p54_rssi_default : &entry[found];
}

static void p54_parse_default_country(struct ieee80211_hw *dev,
				      void *data, int len)
{
	struct pda_country *country;

	if (len != sizeof(*country)) {
		wiphy_err(dev->wiphy,
			  "found possible invalid default country eeprom entry. (entry size: %d)\n",
			  len);

		print_hex_dump_bytes("country:", DUMP_PREFIX_NONE,
				     data, len);

		wiphy_err(dev->wiphy, "please report this issue.\n");
		return;
	}

	country = (struct pda_country *) data;
	if (country->flags == PDR_COUNTRY_CERT_CODE_PSEUDO)
		regulatory_hint(dev->wiphy, country->alpha2);
	else {
		/* TODO:
		 * write a shared/common function that converts
		 * "Regulatory domain codes" (802.11-2007 14.8.2.2)
		 * into ISO/IEC 3166-1 alpha2 for regulatory_hint.
		 */
	}
}

static int p54_convert_output_limits(struct ieee80211_hw *dev,
				     u8 *data, size_t len)
{
	struct p54_common *priv = dev->priv;

	if (len < 2)
		return -EINVAL;

	if (data[0] != 0) {
		wiphy_err(dev->wiphy, "unknown output power db revision:%x\n",
			  data[0]);
		return -EINVAL;
	}

	if (2 + data[1] * sizeof(struct pda_channel_output_limit) > len)
		return -EINVAL;

	priv->output_limit = kmalloc(data[1] *
		sizeof(struct pda_channel_output_limit) +
		sizeof(*priv->output_limit), GFP_KERNEL);

	if (!priv->output_limit)
		return -ENOMEM;

	priv->output_limit->offset = 0;
	priv->output_limit->entries = data[1];
	priv->output_limit->entry_size =
		sizeof(struct pda_channel_output_limit);
	priv->output_limit->len = priv->output_limit->entry_size *
				  priv->output_limit->entries +
				  priv->output_limit->offset;

	memcpy(priv->output_limit->data, &data[2],
	       data[1] * sizeof(struct pda_channel_output_limit));

	return 0;
}

static struct p54_cal_database *p54_convert_db(struct pda_custom_wrapper *src,
					       size_t total_len)
{
	struct p54_cal_database *dst;
	size_t payload_len, entries, entry_size, offset;

	payload_len = le16_to_cpu(src->len);
	entries = le16_to_cpu(src->entries);
	entry_size = le16_to_cpu(src->entry_size);
	offset = le16_to_cpu(src->offset);
	if (((entries * entry_size + offset) != payload_len) ||
	     (payload_len + sizeof(*src) != total_len))
		return NULL;

	dst = kmalloc(sizeof(*dst) + payload_len, GFP_KERNEL);
	if (!dst)
		return NULL;

	dst->entries = entries;
	dst->entry_size = entry_size;
	dst->offset = offset;
	dst->len = payload_len;

	memcpy(dst->data, src->data, payload_len);
	return dst;
}

int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
{
	struct p54_common *priv = dev->priv;
	struct eeprom_pda_wrap *wrap;
	struct pda_entry *entry;
	unsigned int data_len, entry_len;
	void *tmp;
	int err;
	u8 *end = (u8 *)eeprom + len;
	u16 synth = 0;
	u16 crc16 = ~0;

	wrap = (struct eeprom_pda_wrap *) eeprom;
	entry = (void *)wrap->data + le16_to_cpu(wrap->len);

	/* verify that at least the entry length/code fits */
	while ((u8 *)entry <= end - sizeof(*entry)) {
		entry_len = le16_to_cpu(entry->len);
		data_len = ((entry_len - 1) << 1);

		/* abort if entry exceeds whole structure */
		if ((u8 *)entry + sizeof(*entry) + data_len > end)
			break;

		switch (le16_to_cpu(entry->code)) {
		case PDR_MAC_ADDRESS:
			if (data_len != ETH_ALEN)
				break;
			SET_IEEE80211_PERM_ADDR(dev, entry->data);
			break;
		case PDR_PRISM_PA_CAL_OUTPUT_POWER_LIMITS:
			if (priv->output_limit)
				break;
			err = p54_convert_output_limits(dev, entry->data,
							data_len);
			if (err)
				goto err;
			break;
		case PDR_PRISM_PA_CAL_CURVE_DATA: {
			struct pda_pa_curve_data *curve_data =
				(struct pda_pa_curve_data *)entry->data;
			if (data_len < sizeof(*curve_data)) {
				err = -EINVAL;
				goto err;
			}

			switch (curve_data->cal_method_rev) {
			case 0:
				err = p54_convert_rev0(dev, curve_data);
				break;
			case 1:
				err = p54_convert_rev1(dev, curve_data);
				break;
			default:
				wiphy_err(dev->wiphy,
					  "unknown curve data revision %d\n",
					  curve_data->cal_method_rev);
				err = -ENODEV;
				break;
			}
			if (err)
				goto err;
			}
			break;
		case PDR_PRISM_ZIF_TX_IQ_CALIBRATION:
			priv->iq_autocal = kmemdup(entry->data, data_len,
						   GFP_KERNEL);
			if (!priv->iq_autocal) {
				err = -ENOMEM;
				goto err;
			}

			priv->iq_autocal_len = data_len / sizeof(struct pda_iq_autocal_entry);
			break;
		case PDR_DEFAULT_COUNTRY:
			p54_parse_default_country(dev, entry->data, data_len);
			break;
		case PDR_INTERFACE_LIST:
			tmp = entry->data;
			while ((u8 *)tmp < entry->data + data_len) {
				struct exp_if *exp_if = tmp;
				if (exp_if->if_id == cpu_to_le16(IF_ID_ISL39000))
					synth = le16_to_cpu(exp_if->variant);
				tmp += sizeof(*exp_if);
			}
			break;
		case PDR_HARDWARE_PLATFORM_COMPONENT_ID:
			if (data_len < 2)
				break;
			priv->version = *(u8 *)(entry->data + 1);
			break;
		case PDR_RSSI_LINEAR_APPROXIMATION:
		case PDR_RSSI_LINEAR_APPROXIMATION_DUAL_BAND:
		case PDR_RSSI_LINEAR_APPROXIMATION_EXTENDED:
			err = p54_parse_rssical(dev, entry->data, data_len,
						le16_to_cpu(entry->code));
			if (err)
				goto err;
			break;
		case PDR_RSSI_LINEAR_APPROXIMATION_CUSTOMV2: {
			struct pda_custom_wrapper *pda = (void *) entry->data;
			__le16 *src;
			u16 *dst;
			int i;

			if (priv->rssi_db || data_len < sizeof(*pda))
				break;

			priv->rssi_db = p54_convert_db(pda, data_len);
			if (!priv->rssi_db)
				break;

			src = (void *) priv->rssi_db->data;
			dst = (void *) priv->rssi_db->data;

			for (i = 0; i < priv->rssi_db->entries; i++)
				*(dst++) = (s16) le16_to_cpu(*(src++));

			}
			break;
		case PDR_PRISM_PA_CAL_OUTPUT_POWER_LIMITS_CUSTOM: {
			struct pda_custom_wrapper *pda = (void *) entry->data;
			if (priv->output_limit || data_len < sizeof(*pda))
				break;
			priv->output_limit = p54_convert_db(pda, data_len);
			}
			break;
		case PDR_PRISM_PA_CAL_CURVE_DATA_CUSTOM: {
			struct pda_custom_wrapper *pda = (void *) entry->data;
			if (priv->curve_data || data_len < sizeof(*pda))
				break;
			priv->curve_data = p54_convert_db(pda, data_len);
			}
			break;
		case PDR_END:
			crc16 = ~crc_ccitt(crc16, (u8 *) entry, sizeof(*entry));
			if (crc16 != le16_to_cpup((__le16 *)entry->data)) {
				wiphy_err(dev->wiphy, "eeprom failed checksum "
					 "test!\n");
				err = -ENOMSG;
				goto err;
			} else {
				goto good_eeprom;
			}
			break;
		default:
			break;
		}

		crc16 = crc_ccitt(crc16, (u8 *)entry, (entry_len + 1) * 2);
		entry = (void *)entry + (entry_len + 1) * 2;
	}

	wiphy_err(dev->wiphy, "unexpected end of eeprom data.\n");
	err = -ENODATA;
	goto err;

good_eeprom:
	if (!synth || !priv->iq_autocal || !priv->output_limit ||
	    !priv->curve_data) {
		wiphy_err(dev->wiphy,
			  "not all required entries found in eeprom!\n");
		err = -EINVAL;
		goto err;
	}

	err = p54_generate_channel_lists(dev);
	if (err)
		goto err;

	priv->rxhw = synth & PDR_SYNTH_FRONTEND_MASK;
	if (priv->rxhw == PDR_SYNTH_FRONTEND_XBOW)
		p54_init_xbow_synth(priv);
	if (!(synth & PDR_SYNTH_24_GHZ_DISABLED))
		dev->wiphy->bands[IEEE80211_BAND_2GHZ] =
			priv->band_table[IEEE80211_BAND_2GHZ];
	if (!(synth & PDR_SYNTH_5_GHZ_DISABLED))
		dev->wiphy->bands[IEEE80211_BAND_5GHZ] =
			priv->band_table[IEEE80211_BAND_5GHZ];
	if ((synth & PDR_SYNTH_RX_DIV_MASK) == PDR_SYNTH_RX_DIV_SUPPORTED)
		priv->rx_diversity_mask = 3;
	if ((synth & PDR_SYNTH_TX_DIV_MASK) == PDR_SYNTH_TX_DIV_SUPPORTED)
		priv->tx_diversity_mask = 3;

	if (!is_valid_ether_addr(dev->wiphy->perm_addr)) {
		u8 perm_addr[ETH_ALEN];

		wiphy_warn(dev->wiphy,
			   "Invalid hwaddr! Using randomly generated MAC addr\n");
		random_ether_addr(perm_addr);
		SET_IEEE80211_PERM_ADDR(dev, perm_addr);
	}

	priv->cur_rssi = &p54_rssi_default;

	wiphy_info(dev->wiphy, "hwaddr %pM, MAC:isl38%02x RF:%s\n",
		   dev->wiphy->perm_addr, priv->version,
		   p54_rf_chips[priv->rxhw]);

	return 0;

err:
	kfree(priv->iq_autocal);
	kfree(priv->output_limit);
	kfree(priv->curve_data);
	kfree(priv->rssi_db);
	priv->iq_autocal = NULL;
	priv->output_limit = NULL;
	priv->curve_data = NULL;
	priv->rssi_db = NULL;

	wiphy_err(dev->wiphy, "eeprom parse failed!\n");
	return err;
}
EXPORT_SYMBOL_GPL(p54_parse_eeprom);

int p54_read_eeprom(struct ieee80211_hw *dev)
{
	struct p54_common *priv = dev->priv;
	size_t eeprom_size = 0x2020, offset = 0, blocksize, maxblocksize;
	int ret = -ENOMEM;
	void *eeprom;

	maxblocksize = EEPROM_READBACK_LEN;
	if (priv->fw_var >= 0x509)
		maxblocksize -= 0xc;
	else
		maxblocksize -= 0x4;

	eeprom = kzalloc(eeprom_size, GFP_KERNEL);
	if (unlikely(!eeprom))
		goto free;

	while (eeprom_size) {
		blocksize = min(eeprom_size, maxblocksize);
		ret = p54_download_eeprom(priv, (void *) (eeprom + offset),
					  offset, blocksize);
		if (unlikely(ret))
			goto free;

		offset += blocksize;
		eeprom_size -= blocksize;
	}

	ret = p54_parse_eeprom(dev, eeprom, offset);
free:
	kfree(eeprom);
	return ret;
}
EXPORT_SYMBOL_GPL(p54_read_eeprom);