summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/ralink/rt2x00/rt2x00debug.c
blob: f2395309ec006a60ecea426992cab9e50a86d75f (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
	Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
	<http://rt2x00.serialmonkey.com>

 */

/*
	Module: rt2x00lib
	Abstract: rt2x00 debugfs specific routines.
 */

#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/uaccess.h>

#include "rt2x00.h"
#include "rt2x00lib.h"
#include "rt2x00dump.h"

#define MAX_LINE_LENGTH 64

struct rt2x00debug_crypto {
	unsigned long success;
	unsigned long icv_error;
	unsigned long mic_error;
	unsigned long key_error;
};

struct rt2x00debug_intf {
	/*
	 * Pointer to driver structure where
	 * this debugfs entry belongs to.
	 */
	struct rt2x00_dev *rt2x00dev;

	/*
	 * Reference to the rt2x00debug structure
	 * which can be used to communicate with
	 * the registers.
	 */
	const struct rt2x00debug *debug;

	/*
	 * Debugfs entries for:
	 * - driver folder
	 *   - driver file
	 *   - chipset file
	 *   - device state flags file
	 *   - device capability flags file
	 *   - hardware restart file
	 *   - register folder
	 *     - csr offset/value files
	 *     - eeprom offset/value files
	 *     - bbp offset/value files
	 *     - rf offset/value files
	 *     - rfcsr offset/value files
	 *   - queue folder
	 *     - frame dump file
	 *     - queue stats file
	 *     - crypto stats file
	 */
	struct dentry *driver_folder;

	/*
	 * The frame dump file only allows a single reader,
	 * so we need to store the current state here.
	 */
	unsigned long frame_dump_flags;
#define FRAME_DUMP_FILE_OPEN	1

	/*
	 * We queue each frame before dumping it to the user,
	 * per read command we will pass a single skb structure
	 * so we should be prepared to queue multiple sk buffers
	 * before sending it to userspace.
	 */
	struct sk_buff_head frame_dump_skbqueue;
	wait_queue_head_t frame_dump_waitqueue;

	/*
	 * HW crypto statistics.
	 * All statistics are stored separately per cipher type.
	 */
	struct rt2x00debug_crypto crypto_stats[CIPHER_MAX];

	/*
	 * Driver and chipset files will use a data buffer
	 * that has been created in advance. This will simplify
	 * the code since we can use the debugfs functions.
	 */
	struct debugfs_blob_wrapper driver_blob;
	struct debugfs_blob_wrapper chipset_blob;

	/*
	 * Requested offset for each register type.
	 */
	unsigned int offset_csr;
	unsigned int offset_eeprom;
	unsigned int offset_bbp;
	unsigned int offset_rf;
	unsigned int offset_rfcsr;
};

void rt2x00debug_update_crypto(struct rt2x00_dev *rt2x00dev,
			       struct rxdone_entry_desc *rxdesc)
{
	struct rt2x00debug_intf *intf = rt2x00dev->debugfs_intf;
	enum cipher cipher = rxdesc->cipher;
	enum rx_crypto status = rxdesc->cipher_status;

	if (cipher == CIPHER_TKIP_NO_MIC)
		cipher = CIPHER_TKIP;
	if (cipher == CIPHER_NONE || cipher >= CIPHER_MAX)
		return;

	/* Remove CIPHER_NONE index */
	cipher--;

	intf->crypto_stats[cipher].success += (status == RX_CRYPTO_SUCCESS);
	intf->crypto_stats[cipher].icv_error += (status == RX_CRYPTO_FAIL_ICV);
	intf->crypto_stats[cipher].mic_error += (status == RX_CRYPTO_FAIL_MIC);
	intf->crypto_stats[cipher].key_error += (status == RX_CRYPTO_FAIL_KEY);
}

void rt2x00debug_dump_frame(struct rt2x00_dev *rt2x00dev,
			    enum rt2x00_dump_type type, struct queue_entry *entry)
{
	struct rt2x00debug_intf *intf = rt2x00dev->debugfs_intf;
	struct sk_buff *skb = entry->skb;
	struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
	struct sk_buff *skbcopy;
	struct rt2x00dump_hdr *dump_hdr;
	struct timespec64 timestamp;
	u32 data_len;

	if (likely(!test_bit(FRAME_DUMP_FILE_OPEN, &intf->frame_dump_flags)))
		return;

	ktime_get_ts64(&timestamp);

	if (skb_queue_len(&intf->frame_dump_skbqueue) > 20) {
		rt2x00_dbg(rt2x00dev, "txrx dump queue length exceeded\n");
		return;
	}

	data_len = skb->len;
	if (skbdesc->flags & SKBDESC_DESC_IN_SKB)
		data_len -= skbdesc->desc_len;

	skbcopy = alloc_skb(sizeof(*dump_hdr) + skbdesc->desc_len + data_len,
			    GFP_ATOMIC);
	if (!skbcopy) {
		rt2x00_dbg(rt2x00dev, "Failed to copy skb for dump\n");
		return;
	}

	dump_hdr = skb_put(skbcopy, sizeof(*dump_hdr));
	dump_hdr->version = cpu_to_le32(DUMP_HEADER_VERSION);
	dump_hdr->header_length = cpu_to_le32(sizeof(*dump_hdr));
	dump_hdr->desc_length = cpu_to_le32(skbdesc->desc_len);
	dump_hdr->data_length = cpu_to_le32(data_len);
	dump_hdr->chip_rt = cpu_to_le16(rt2x00dev->chip.rt);
	dump_hdr->chip_rf = cpu_to_le16(rt2x00dev->chip.rf);
	dump_hdr->chip_rev = cpu_to_le16(rt2x00dev->chip.rev);
	dump_hdr->type = cpu_to_le16(type);
	dump_hdr->queue_index = entry->queue->qid;
	dump_hdr->entry_index = entry->entry_idx;
	dump_hdr->timestamp_sec = cpu_to_le32(timestamp.tv_sec);
	dump_hdr->timestamp_usec = cpu_to_le32(timestamp.tv_nsec /
					       NSEC_PER_USEC);

	if (!(skbdesc->flags & SKBDESC_DESC_IN_SKB))
		skb_put_data(skbcopy, skbdesc->desc, skbdesc->desc_len);
	skb_put_data(skbcopy, skb->data, skb->len);

	skb_queue_tail(&intf->frame_dump_skbqueue, skbcopy);
	wake_up_interruptible(&intf->frame_dump_waitqueue);

	/*
	 * Verify that the file has not been closed while we were working.
	 */
	if (!test_bit(FRAME_DUMP_FILE_OPEN, &intf->frame_dump_flags))
		skb_queue_purge(&intf->frame_dump_skbqueue);
}
EXPORT_SYMBOL_GPL(rt2x00debug_dump_frame);

static int rt2x00debug_file_open(struct inode *inode, struct file *file)
{
	struct rt2x00debug_intf *intf = inode->i_private;

	file->private_data = inode->i_private;

	if (!try_module_get(intf->debug->owner))
		return -EBUSY;

	return 0;
}

static int rt2x00debug_file_release(struct inode *inode, struct file *file)
{
	struct rt2x00debug_intf *intf = file->private_data;

	module_put(intf->debug->owner);

	return 0;
}

static int rt2x00debug_open_queue_dump(struct inode *inode, struct file *file)
{
	struct rt2x00debug_intf *intf = inode->i_private;
	int retval;

	retval = rt2x00debug_file_open(inode, file);
	if (retval)
		return retval;

	if (test_and_set_bit(FRAME_DUMP_FILE_OPEN, &intf->frame_dump_flags)) {
		rt2x00debug_file_release(inode, file);
		return -EBUSY;
	}

	return 0;
}

static int rt2x00debug_release_queue_dump(struct inode *inode, struct file *file)
{
	struct rt2x00debug_intf *intf = inode->i_private;

	skb_queue_purge(&intf->frame_dump_skbqueue);

	clear_bit(FRAME_DUMP_FILE_OPEN, &intf->frame_dump_flags);

	return rt2x00debug_file_release(inode, file);
}

static ssize_t rt2x00debug_read_queue_dump(struct file *file,
					   char __user *buf,
					   size_t length,
					   loff_t *offset)
{
	struct rt2x00debug_intf *intf = file->private_data;
	struct sk_buff *skb;
	size_t status;
	int retval;

	if (file->f_flags & O_NONBLOCK)
		return -EAGAIN;

	retval =
	    wait_event_interruptible(intf->frame_dump_waitqueue,
				     (skb =
				     skb_dequeue(&intf->frame_dump_skbqueue)));
	if (retval)
		return retval;

	status = min_t(size_t, skb->len, length);
	if (copy_to_user(buf, skb->data, status)) {
		status = -EFAULT;
		goto exit;
	}

	*offset += status;

exit:
	kfree_skb(skb);

	return status;
}

static __poll_t rt2x00debug_poll_queue_dump(struct file *file,
						poll_table *wait)
{
	struct rt2x00debug_intf *intf = file->private_data;

	poll_wait(file, &intf->frame_dump_waitqueue, wait);

	if (!skb_queue_empty(&intf->frame_dump_skbqueue))
		return EPOLLOUT | EPOLLWRNORM;

	return 0;
}

static const struct file_operations rt2x00debug_fop_queue_dump = {
	.owner		= THIS_MODULE,
	.read		= rt2x00debug_read_queue_dump,
	.poll		= rt2x00debug_poll_queue_dump,
	.open		= rt2x00debug_open_queue_dump,
	.release	= rt2x00debug_release_queue_dump,
	.llseek		= default_llseek,
};

static ssize_t rt2x00debug_read_queue_stats(struct file *file,
					    char __user *buf,
					    size_t length,
					    loff_t *offset)
{
	struct rt2x00debug_intf *intf = file->private_data;
	struct data_queue *queue;
	unsigned long irqflags;
	unsigned int lines = 1 + intf->rt2x00dev->data_queues;
	size_t size;
	char *data;
	char *temp;

	if (*offset)
		return 0;

	data = kcalloc(lines, MAX_LINE_LENGTH, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	temp = data +
	    sprintf(data, "qid\tflags\t\tcount\tlimit\tlength\tindex\tdma done\tdone\n");

	queue_for_each(intf->rt2x00dev, queue) {
		spin_lock_irqsave(&queue->index_lock, irqflags);

		temp += sprintf(temp, "%d\t0x%.8x\t%d\t%d\t%d\t%d\t%d\t\t%d\n",
				queue->qid, (unsigned int)queue->flags,
				queue->count, queue->limit, queue->length,
				queue->index[Q_INDEX],
				queue->index[Q_INDEX_DMA_DONE],
				queue->index[Q_INDEX_DONE]);

		spin_unlock_irqrestore(&queue->index_lock, irqflags);
	}

	size = strlen(data);
	size = min(size, length);

	if (copy_to_user(buf, data, size)) {
		kfree(data);
		return -EFAULT;
	}

	kfree(data);

	*offset += size;
	return size;
}

static const struct file_operations rt2x00debug_fop_queue_stats = {
	.owner		= THIS_MODULE,
	.read		= rt2x00debug_read_queue_stats,
	.open		= rt2x00debug_file_open,
	.release	= rt2x00debug_file_release,
	.llseek		= default_llseek,
};

#ifdef CONFIG_RT2X00_LIB_CRYPTO
static ssize_t rt2x00debug_read_crypto_stats(struct file *file,
					     char __user *buf,
					     size_t length,
					     loff_t *offset)
{
	struct rt2x00debug_intf *intf = file->private_data;
	static const char * const name[] = { "WEP64", "WEP128", "TKIP", "AES" };
	char *data;
	char *temp;
	size_t size;
	unsigned int i;

	if (*offset)
		return 0;

	data = kcalloc(1 + CIPHER_MAX, MAX_LINE_LENGTH, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	temp = data;
	temp += sprintf(data, "cipher\tsuccess\ticv err\tmic err\tkey err\n");

	for (i = 0; i < CIPHER_MAX; i++) {
		temp += sprintf(temp, "%s\t%lu\t%lu\t%lu\t%lu\n", name[i],
				intf->crypto_stats[i].success,
				intf->crypto_stats[i].icv_error,
				intf->crypto_stats[i].mic_error,
				intf->crypto_stats[i].key_error);
	}

	size = strlen(data);
	size = min(size, length);

	if (copy_to_user(buf, data, size)) {
		kfree(data);
		return -EFAULT;
	}

	kfree(data);

	*offset += size;
	return size;
}

static const struct file_operations rt2x00debug_fop_crypto_stats = {
	.owner		= THIS_MODULE,
	.read		= rt2x00debug_read_crypto_stats,
	.open		= rt2x00debug_file_open,
	.release	= rt2x00debug_file_release,
	.llseek		= default_llseek,
};
#endif

#define RT2X00DEBUGFS_OPS_READ(__name, __format, __type)	\
static ssize_t rt2x00debug_read_##__name(struct file *file,	\
					 char __user *buf,	\
					 size_t length,		\
					 loff_t *offset)	\
{								\
	struct rt2x00debug_intf *intf = file->private_data;	\
	const struct rt2x00debug *debug = intf->debug;		\
	char line[16];						\
	size_t size;						\
	unsigned int index = intf->offset_##__name;		\
	__type value;						\
								\
	if (*offset)						\
		return 0;					\
								\
	if (index >= debug->__name.word_count)			\
		return -EINVAL;					\
								\
	index += (debug->__name.word_base /			\
		  debug->__name.word_size);			\
								\
	if (debug->__name.flags & RT2X00DEBUGFS_OFFSET)		\
		index *= debug->__name.word_size;		\
								\
	value = debug->__name.read(intf->rt2x00dev, index);	\
								\
	size = sprintf(line, __format, value);			\
								\
	return simple_read_from_buffer(buf, length, offset, line, size); \
}

#define RT2X00DEBUGFS_OPS_WRITE(__name, __type)			\
static ssize_t rt2x00debug_write_##__name(struct file *file,	\
					  const char __user *buf,\
					  size_t length,	\
					  loff_t *offset)	\
{								\
	struct rt2x00debug_intf *intf = file->private_data;	\
	const struct rt2x00debug *debug = intf->debug;		\
	char line[17];						\
	size_t size;						\
	unsigned int index = intf->offset_##__name;		\
	__type value;						\
								\
	if (*offset)						\
		return 0;					\
								\
	if (index >= debug->__name.word_count)			\
		return -EINVAL;					\
								\
	if (length > sizeof(line))				\
		return -EINVAL;					\
								\
	if (copy_from_user(line, buf, length))			\
		return -EFAULT;					\
	line[16] = 0;						\
						\
	size = strlen(line);					\
	value = simple_strtoul(line, NULL, 0);			\
								\
	index += (debug->__name.word_base /			\
		  debug->__name.word_size);			\
								\
	if (debug->__name.flags & RT2X00DEBUGFS_OFFSET)		\
		index *= debug->__name.word_size;		\
								\
	debug->__name.write(intf->rt2x00dev, index, value);	\
								\
	*offset += size;					\
	return size;						\
}

#define RT2X00DEBUGFS_OPS(__name, __format, __type)		\
RT2X00DEBUGFS_OPS_READ(__name, __format, __type);		\
RT2X00DEBUGFS_OPS_WRITE(__name, __type);			\
								\
static const struct file_operations rt2x00debug_fop_##__name = {\
	.owner		= THIS_MODULE,				\
	.read		= rt2x00debug_read_##__name,		\
	.write		= rt2x00debug_write_##__name,		\
	.open		= rt2x00debug_file_open,		\
	.release	= rt2x00debug_file_release,		\
	.llseek		= generic_file_llseek,			\
};

RT2X00DEBUGFS_OPS(csr, "0x%.8x\n", u32);
RT2X00DEBUGFS_OPS(eeprom, "0x%.4x\n", u16);
RT2X00DEBUGFS_OPS(bbp, "0x%.2x\n", u8);
RT2X00DEBUGFS_OPS(rf, "0x%.8x\n", u32);
RT2X00DEBUGFS_OPS(rfcsr, "0x%.2x\n", u8);

static ssize_t rt2x00debug_read_dev_flags(struct file *file,
					  char __user *buf,
					  size_t length,
					  loff_t *offset)
{
	struct rt2x00debug_intf *intf =	file->private_data;
	char line[16];
	size_t size;

	if (*offset)
		return 0;

	size = sprintf(line, "0x%.8x\n", (unsigned int)intf->rt2x00dev->flags);

	return simple_read_from_buffer(buf, length, offset, line, size);
}

static const struct file_operations rt2x00debug_fop_dev_flags = {
	.owner		= THIS_MODULE,
	.read		= rt2x00debug_read_dev_flags,
	.open		= rt2x00debug_file_open,
	.release	= rt2x00debug_file_release,
	.llseek		= default_llseek,
};

static ssize_t rt2x00debug_read_cap_flags(struct file *file,
					  char __user *buf,
					  size_t length,
					  loff_t *offset)
{
	struct rt2x00debug_intf *intf =	file->private_data;
	char line[16];
	size_t size;

	if (*offset)
		return 0;

	size = sprintf(line, "0x%.8x\n", (unsigned int)intf->rt2x00dev->cap_flags);

	return simple_read_from_buffer(buf, length, offset, line, size);
}

static const struct file_operations rt2x00debug_fop_cap_flags = {
	.owner		= THIS_MODULE,
	.read		= rt2x00debug_read_cap_flags,
	.open		= rt2x00debug_file_open,
	.release	= rt2x00debug_file_release,
	.llseek		= default_llseek,
};

static ssize_t rt2x00debug_write_restart_hw(struct file *file,
					    const char __user *buf,
					    size_t length,
					    loff_t *offset)
{
	struct rt2x00debug_intf *intf =	file->private_data;
	struct rt2x00_dev *rt2x00dev = intf->rt2x00dev;
	static unsigned long last_reset = INITIAL_JIFFIES;

	if (!rt2x00_has_cap_restart_hw(rt2x00dev))
		return -EOPNOTSUPP;

	if (time_before(jiffies, last_reset + msecs_to_jiffies(2000)))
		return -EBUSY;

	last_reset = jiffies;

	ieee80211_restart_hw(rt2x00dev->hw);
	return length;
}

static const struct file_operations rt2x00debug_restart_hw = {
	.owner = THIS_MODULE,
	.write = rt2x00debug_write_restart_hw,
	.open = simple_open,
	.llseek = generic_file_llseek,
};

static void rt2x00debug_create_file_driver(const char *name,
					   struct rt2x00debug_intf *intf,
					   struct debugfs_blob_wrapper *blob)
{
	char *data;

	data = kzalloc(3 * MAX_LINE_LENGTH, GFP_KERNEL);
	if (!data)
		return;

	blob->data = data;
	data += sprintf(data, "driver:\t%s\n", intf->rt2x00dev->ops->name);
	data += sprintf(data, "version:\t%s\n", DRV_VERSION);
	blob->size = strlen(blob->data);

	debugfs_create_blob(name, 0400, intf->driver_folder, blob);
}

static void rt2x00debug_create_file_chipset(const char *name,
					    struct rt2x00debug_intf *intf,
					    struct debugfs_blob_wrapper *blob)
{
	const struct rt2x00debug *debug = intf->debug;
	char *data;

	data = kzalloc(9 * MAX_LINE_LENGTH, GFP_KERNEL);
	if (!data)
		return;

	blob->data = data;
	data += sprintf(data, "rt chip:\t%04x\n", intf->rt2x00dev->chip.rt);
	data += sprintf(data, "rf chip:\t%04x\n", intf->rt2x00dev->chip.rf);
	data += sprintf(data, "revision:\t%04x\n", intf->rt2x00dev->chip.rev);
	data += sprintf(data, "\n");
	data += sprintf(data, "register\tbase\twords\twordsize\n");
#define RT2X00DEBUGFS_SPRINTF_REGISTER(__name)			\
{								\
	if (debug->__name.read)					\
		data += sprintf(data, __stringify(__name)	\
				"\t%d\t%d\t%d\n",		\
				debug->__name.word_base,	\
				debug->__name.word_count,	\
				debug->__name.word_size);	\
}
	RT2X00DEBUGFS_SPRINTF_REGISTER(csr);
	RT2X00DEBUGFS_SPRINTF_REGISTER(eeprom);
	RT2X00DEBUGFS_SPRINTF_REGISTER(bbp);
	RT2X00DEBUGFS_SPRINTF_REGISTER(rf);
	RT2X00DEBUGFS_SPRINTF_REGISTER(rfcsr);
#undef RT2X00DEBUGFS_SPRINTF_REGISTER

	blob->size = strlen(blob->data);

	debugfs_create_blob(name, 0400, intf->driver_folder, blob);
}

void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
{
	const struct rt2x00debug *debug = rt2x00dev->ops->debugfs;
	struct rt2x00debug_intf *intf;
	struct dentry *queue_folder;
	struct dentry *register_folder;

	intf = kzalloc(sizeof(struct rt2x00debug_intf), GFP_KERNEL);
	if (!intf) {
		rt2x00_err(rt2x00dev, "Failed to allocate debug handler\n");
		return;
	}

	intf->debug = debug;
	intf->rt2x00dev = rt2x00dev;
	rt2x00dev->debugfs_intf = intf;

	intf->driver_folder =
	    debugfs_create_dir(intf->rt2x00dev->ops->name,
			       rt2x00dev->hw->wiphy->debugfsdir);

	rt2x00debug_create_file_driver("driver", intf, &intf->driver_blob);
	rt2x00debug_create_file_chipset("chipset", intf, &intf->chipset_blob);
	debugfs_create_file("dev_flags", 0400, intf->driver_folder, intf,
			    &rt2x00debug_fop_dev_flags);
	debugfs_create_file("cap_flags", 0400, intf->driver_folder, intf,
			    &rt2x00debug_fop_cap_flags);
	debugfs_create_file("restart_hw", 0200, intf->driver_folder, intf,
			    &rt2x00debug_restart_hw);

	register_folder = debugfs_create_dir("register", intf->driver_folder);

#define RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(__intf, __name)		\
({									\
	if (debug->__name.read) {					\
		debugfs_create_u32(__stringify(__name) "_offset", 0600,	\
				   register_folder,			\
				   &(__intf)->offset_##__name);		\
									\
		debugfs_create_file(__stringify(__name) "_value", 0600,	\
				    register_folder, (__intf),		\
				    &rt2x00debug_fop_##__name);		\
	}								\
})

	RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(intf, csr);
	RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(intf, eeprom);
	RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(intf, bbp);
	RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(intf, rf);
	RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(intf, rfcsr);

#undef RT2X00DEBUGFS_CREATE_REGISTER_ENTRY

	queue_folder = debugfs_create_dir("queue", intf->driver_folder);

	debugfs_create_file("dump", 0400, queue_folder, intf,
			    &rt2x00debug_fop_queue_dump);

	skb_queue_head_init(&intf->frame_dump_skbqueue);
	init_waitqueue_head(&intf->frame_dump_waitqueue);

	debugfs_create_file("queue", 0400, queue_folder, intf,
			    &rt2x00debug_fop_queue_stats);

#ifdef CONFIG_RT2X00_LIB_CRYPTO
	if (rt2x00_has_cap_hw_crypto(rt2x00dev))
		debugfs_create_file("crypto", 0444, queue_folder, intf,
				    &rt2x00debug_fop_crypto_stats);
#endif

	return;
}

void rt2x00debug_deregister(struct rt2x00_dev *rt2x00dev)
{
	struct rt2x00debug_intf *intf = rt2x00dev->debugfs_intf;

	if (unlikely(!intf))
		return;

	skb_queue_purge(&intf->frame_dump_skbqueue);

	debugfs_remove_recursive(intf->driver_folder);
	kfree(intf->chipset_blob.data);
	kfree(intf->driver_blob.data);
	kfree(intf);

	rt2x00dev->debugfs_intf = NULL;
}