summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/cw1200/itp.c
blob: c0730bb49b755977f8296fc4fb53a23422de4fa9 (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
/*
 * mac80211 glue code for mac80211 ST-Ericsson CW1200 drivers
 * ITP code
 *
 * Copyright (c) 2010, ST-Ericsson
 * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
 *
 * 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/module.h>
#include <linux/debugfs.h>
#include <linux/poll.h>
#include <linux/time.h>
#include <linux/random.h>
#include <linux/kallsyms.h>
#include <net/mac80211.h>
#include "cw1200.h"
#include "debug.h"
#include "itp.h"
#include "sta.h"

static int __cw1200_itp_open(struct cw1200_common *priv);
static int __cw1200_itp_close(struct cw1200_common *priv);
static void cw1200_itp_rx_start(struct cw1200_common *priv);
static void cw1200_itp_rx_stop(struct cw1200_common *priv);
static void cw1200_itp_rx_stats(struct cw1200_common *priv);
static void cw1200_itp_rx_reset(struct cw1200_common *priv);
static void cw1200_itp_tx_stop(struct cw1200_common *priv);
static void cw1200_itp_handle(struct cw1200_common *priv,
			      struct sk_buff *skb);
static void cw1200_itp_err(struct cw1200_common *priv,
			   int err,
			   int arg);
static void __cw1200_itp_tx_stop(struct cw1200_common *priv);

static ssize_t cw1200_itp_read(struct file *file,
	char __user *user_buf, size_t count, loff_t *ppos)
{
	struct cw1200_common *priv = file->private_data;
	struct cw1200_itp *itp = &priv->debug->itp;
	struct sk_buff *skb;
	int ret;

	if (skb_queue_empty(&itp->log_queue))
		return 0;

	skb = skb_dequeue(&itp->log_queue);
	ret = copy_to_user(user_buf, skb->data, skb->len);
	*ppos += skb->len;
	skb->data[skb->len] = 0;
	pr_debug("[ITP] >>> %s", skb->data);
	consume_skb(skb);

	return skb->len - ret;
}

static ssize_t cw1200_itp_write(struct file *file,
	const char __user *user_buf, size_t count, loff_t *ppos)
{
	struct cw1200_common *priv = file->private_data;
	struct sk_buff *skb;

	if (!count || count > 1024)
		return -EINVAL;
	skb = dev_alloc_skb(count + 1);
	if (!skb)
		return -ENOMEM;
	skb_trim(skb, 0);
	skb_put(skb, count + 1);
	if (copy_from_user(skb->data, user_buf, count)) {
		kfree_skb(skb);
		return -EFAULT;
	}
	skb->data[count] = 0;

	cw1200_itp_handle(priv, skb);
	consume_skb(skb);
	return count;
}

static unsigned int cw1200_itp_poll(struct file *file, poll_table *wait)
{
	struct cw1200_common *priv = file->private_data;
	struct cw1200_itp *itp = &priv->debug->itp;
	unsigned int mask = 0;

	poll_wait(file, &itp->read_wait, wait);

	if (!skb_queue_empty(&itp->log_queue))
		mask |= POLLIN | POLLRDNORM;

	mask |= POLLOUT | POLLWRNORM;

	return mask;
}

static int cw1200_itp_open(struct inode *inode, struct file *file)
{
	struct cw1200_common *priv = inode->i_private;
	struct cw1200_itp *itp = &priv->debug->itp;
	int ret = 0;

	file->private_data = priv;
	if (atomic_inc_return(&itp->open_count) == 1) {
		ret = __cw1200_itp_open(priv);
		if (ret && !atomic_dec_return(&itp->open_count))
			__cw1200_itp_close(priv);
	} else {
		atomic_dec(&itp->open_count);
		ret = -EBUSY;
	}

	return ret;
}

static int cw1200_itp_close(struct inode *inode, struct file *file)
{
	struct cw1200_common *priv = file->private_data;
	struct cw1200_itp *itp = &priv->debug->itp;
	if (!atomic_dec_return(&itp->open_count)) {
		__cw1200_itp_close(priv);
		wake_up(&itp->close_wait);
	}
	return 0;
}

static const struct file_operations fops_itp = {
	.open = cw1200_itp_open,
	.read = cw1200_itp_read,
	.write = cw1200_itp_write,
	.poll = cw1200_itp_poll,
	.release = cw1200_itp_close,
	.llseek = default_llseek,
	.owner = THIS_MODULE,
};

static void cw1200_itp_fill_pattern(u8 *data, int size,
		enum cw1200_itp_data_modes mode)
{
	if (size <= 0)
		return;

	switch (mode) {
	default:
	case ITP_DATA_ZEROS:
		memset(data, 0x0, size);
		break;
	case ITP_DATA_ONES:
		memset(data, 0xff, size);
		break;
	case ITP_DATA_ZERONES:
		memset(data, 0x55, size);
		break;
	case ITP_DATA_RANDOM:
		get_random_bytes(data, size);
		break;
	}
	return;
}

static void cw1200_itp_tx_work(struct work_struct *work)
{
	struct cw1200_itp *itp = container_of(work, struct cw1200_itp,
		    tx_work.work);
	struct cw1200_common *priv = itp->priv;
	atomic_set(&priv->bh_tx, 1);
	wake_up(&priv->bh_wq);
}

static void cw1200_itp_tx_finish(struct work_struct *work)
{
	struct cw1200_itp *itp = container_of(work, struct cw1200_itp,
		    tx_finish.work);
	__cw1200_itp_tx_stop(itp->priv);
}

int cw1200_itp_init(struct cw1200_common *priv)
{
	struct cw1200_itp *itp = &priv->debug->itp;

	itp->priv = priv;
	atomic_set(&itp->open_count, 0);
	atomic_set(&itp->stop_tx, 0);
	atomic_set(&itp->awaiting_confirm, 0);
	skb_queue_head_init(&itp->log_queue);
	spin_lock_init(&itp->tx_lock);
	init_waitqueue_head(&itp->read_wait);
	init_waitqueue_head(&itp->write_wait);
	init_waitqueue_head(&itp->close_wait);
	INIT_DELAYED_WORK(&itp->tx_work, cw1200_itp_tx_work);
	INIT_DELAYED_WORK(&itp->tx_finish, cw1200_itp_tx_finish);
	itp->data = NULL;
	itp->hdr_len = WSM_TX_EXTRA_HEADROOM +
			sizeof(struct ieee80211_hdr_3addr);

	if (!debugfs_create_file("itp", S_IRUSR | S_IWUSR,
				 priv->debug->debugfs_phy, priv, &fops_itp))
		return -ENOMEM;

	return 0;
}

void cw1200_itp_release(struct cw1200_common *priv)
{
	struct cw1200_itp *itp = &priv->debug->itp;

	wait_event_interruptible(itp->close_wait,
				 !atomic_read(&itp->open_count));

	WARN_ON(atomic_read(&itp->open_count));

	skb_queue_purge(&itp->log_queue);
	cw1200_itp_tx_stop(priv);
}

static int __cw1200_itp_open(struct cw1200_common *priv)
{
	struct cw1200_itp *itp = &priv->debug->itp;

	if (!priv->vif)
		return -EINVAL;
	if (priv->join_status)
		return -EINVAL;
	itp->saved_channel = priv->channel;
	if (!priv->channel)
		priv->channel = &priv->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels[0];
	wsm_set_bssid_filtering(priv, false);
	cw1200_itp_rx_reset(priv);
	return 0;
}

static int __cw1200_itp_close(struct cw1200_common *priv)
{
	struct cw1200_itp *itp = &priv->debug->itp;
	if (atomic_read(&itp->test_mode) == TEST_MODE_RX_TEST)
		cw1200_itp_rx_stop(priv);
	cw1200_itp_tx_stop(priv);
	cw1200_disable_listening(priv);
	cw1200_update_filtering(priv);
	priv->channel = itp->saved_channel;
	return 0;
}

bool cw1200_is_itp(struct cw1200_common *priv)
{
	struct cw1200_itp *itp = &priv->debug->itp;
	return atomic_read(&itp->open_count) != 0;
}

static void cw1200_itp_rx_reset(struct cw1200_common *priv)
{
	struct cw1200_itp *itp = &priv->debug->itp;
	itp->rx_cnt = 0;
	itp->rx_rssi = 0;
	itp->rx_rssi_max = -1000;
	itp->rx_rssi_min = 1000;
}

static void cw1200_itp_rx_start(struct cw1200_common *priv)
{
	struct cw1200_itp *itp = &priv->debug->itp;

	pr_debug("[ITP] RX start, band = %d, ch = %d\n",
		 itp->band, itp->ch);
	atomic_set(&itp->test_mode, TEST_MODE_RX_TEST);
	cw1200_update_listening(priv, false);
	priv->channel = &priv->hw->
		wiphy->bands[itp->band]->channels[itp->ch];
	cw1200_update_listening(priv, true);
	wsm_set_bssid_filtering(priv, false);
}

static void cw1200_itp_rx_stop(struct cw1200_common *priv)
{
	struct cw1200_itp *itp = &priv->debug->itp;
	pr_debug("[ITP] RX stop\n");
	atomic_set(&itp->test_mode, TEST_MODE_NO_TEST);
	cw1200_itp_rx_reset(priv);
}

static void cw1200_itp_rx_stats(struct cw1200_common *priv)
{
	struct cw1200_itp *itp = &priv->debug->itp;
	struct sk_buff *skb;
	char buf[128];
	int len, ret;
	struct wsm_mib_counters_table counters;

	ret = wsm_get_counters_table(priv, &counters);

	if (ret)
		cw1200_itp_err(priv, -EBUSY, 20);

	if (!itp->rx_cnt)
		len = snprintf(buf, sizeof(buf), "1,0,0,0,0,%d\n",
			       counters.rx_packet_errors);
	else
		len = snprintf(buf, sizeof(buf), "1,%d,%ld,%d,%d,%d\n",
			       itp->rx_cnt,
			       itp->rx_cnt ? itp->rx_rssi / itp->rx_cnt : 0,
			       itp->rx_rssi_min, itp->rx_rssi_max,
			       counters.rx_packet_errors);

	if (len <= 0) {
		cw1200_itp_err(priv, -EBUSY, 21);
		return;
	}

	skb = dev_alloc_skb(len);
	if (!skb) {
		cw1200_itp_err(priv, -ENOMEM, 22);
		return;
	}

	itp->rx_cnt = 0;
	itp->rx_rssi = 0;
	itp->rx_rssi_max = -1000;
	itp->rx_rssi_min = 1000;

	skb_trim(skb, 0);
	skb_put(skb, len);

	memcpy(skb->data, buf, len);
	skb_queue_tail(&itp->log_queue, skb);
	wake_up(&itp->read_wait);
}

static void cw1200_itp_tx_start(struct cw1200_common *priv)
{
	struct wsm_tx *tx;
	struct ieee80211_hdr_3addr *hdr;
	struct cw1200_itp *itp = &priv->debug->itp;
	struct wsm_mib_association_mode assoc_mode = {
		.flags = WSM_ASSOCIATION_MODE_USE_PREAMBLE_TYPE,
		.preamble = itp->preamble,
	};
	int len;
	u8 da_addr[6] = ITP_DEFAULT_DA_ADDR;

	/* Rates index 4 and 5 are not supported */
	if (itp->rate > 3)
		itp->rate += 2;

	pr_debug("[ITP] TX start: band = %d, ch = %d, rate = %d, preamble = %d, number = %d, data_mode = %d, interval = %d, power = %d, data_len = %d\n",
		 itp->band, itp->ch, itp->rate, itp->preamble,
		 itp->number, itp->data_mode, itp->interval_us,
		 itp->power, itp->data_len);

	len = itp->hdr_len + itp->data_len;

	itp->data = kmalloc(len, GFP_KERNEL);
	tx = (struct wsm_tx *)itp->data;
	tx->hdr.len = itp->data_len + itp->hdr_len;
	tx->hdr.id = __cpu_to_le16(0x0004 | 1 << 6);
	tx->max_tx_rate = itp->rate;
	tx->queue_id = 3;
	tx->more = 0;
	tx->flags = 0xc;
	tx->packet_id = 0x55ff55;
	tx->reserved = 0;
	tx->expire_time = 1;

	if (itp->preamble == ITP_PREAMBLE_GREENFIELD)
		tx->ht_tx_parameters = WSM_HT_TX_GREENFIELD;
	else if (itp->preamble == ITP_PREAMBLE_MIXED)
		tx->ht_tx_parameters = WSM_HT_TX_MIXED;

	hdr = (struct ieee80211_hdr_3addr *)&itp->data[sizeof(struct wsm_tx)];
	memset(hdr, 0, sizeof(*hdr));
	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |	IEEE80211_FCTL_TODS);
	memcpy(hdr->addr1, da_addr, ETH_ALEN);
	memcpy(hdr->addr2, priv->vif->addr, ETH_ALEN);
	memcpy(hdr->addr3, da_addr, ETH_ALEN);

	cw1200_itp_fill_pattern(&itp->data[itp->hdr_len],
				itp->data_len, itp->data_mode);

	cw1200_update_listening(priv, false);
	priv->channel = &priv->hw->wiphy->bands[itp->band]->channels[itp->ch];
	WARN_ON(wsm_set_output_power(priv, itp->power));
	if (itp->preamble == ITP_PREAMBLE_SHORT ||
	    itp->preamble == ITP_PREAMBLE_LONG)
		WARN_ON(wsm_set_association_mode(priv,
						 &assoc_mode));
	wsm_set_bssid_filtering(priv, false);
	cw1200_update_listening(priv, true);

	spin_lock_bh(&itp->tx_lock);
	atomic_set(&itp->test_mode, TEST_MODE_TX_TEST);
	atomic_set(&itp->awaiting_confirm, 0);
	atomic_set(&itp->stop_tx, 0);
	atomic_set(&priv->bh_tx, 1);
	ktime_get_ts(&itp->last_sent);
	wake_up(&priv->bh_wq);
	spin_unlock_bh(&itp->tx_lock);
}

void __cw1200_itp_tx_stop(struct cw1200_common *priv)
{
	struct cw1200_itp *itp = &priv->debug->itp;
	spin_lock_bh(&itp->tx_lock);
	kfree(itp->data);
	itp->data = NULL;
	atomic_set(&itp->test_mode, TEST_MODE_NO_TEST);
	spin_unlock_bh(&itp->tx_lock);
}

static void cw1200_itp_tx_stop(struct cw1200_common *priv)
{
	struct cw1200_itp *itp = &priv->debug->itp;
	pr_debug("[ITP] TX stop\n");
	atomic_set(&itp->stop_tx, 1);
	flush_workqueue(priv->workqueue);

	/* time for FW to confirm all tx requests */
	msleep(500);

	__cw1200_itp_tx_stop(priv);
}

static int cw1200_print_fw_version(struct cw1200_common *priv,
				   u8 *buf, size_t len)
{
	return snprintf(buf, len, "%s %d.%d",
			cw1200_fw_types[priv->wsm_caps.fw_type],
			priv->wsm_caps.fw_ver,
			priv->wsm_caps.fw_build);
}

static void cw1200_itp_get_version(struct cw1200_common *priv,
		enum cw1200_itp_version_type type)
{
	struct cw1200_itp *itp = &priv->debug->itp;
	struct sk_buff *skb;
	char buf[ITP_BUF_SIZE];
	size_t size = 0;
	int len;
	pr_debug("[ITP] print %s version\n",
		 type == ITP_CHIP_ID ? "chip" : "firmware");

	len = snprintf(buf, ITP_BUF_SIZE, "2,");
	if (len <= 0) {
		cw1200_itp_err(priv, -EINVAL, 40);
		return;
	}
	size += len;

	switch (type) {
	case ITP_CHIP_ID:
		len = cw1200_print_fw_version(priv, buf+size,
				ITP_BUF_SIZE - size);

		if (len <= 0) {
			cw1200_itp_err(priv, -EINVAL, 41);
			return;
		}
		size += len;
		break;
	case ITP_FW_VER:
		len = snprintf(buf+size, ITP_BUF_SIZE - size,
				"%d.%d", priv->wsm_caps.hw_id,
				priv->wsm_caps.hw_subid);
		if (len <= 0) {
			cw1200_itp_err(priv, -EINVAL, 42);
			return;
		}
		size += len;
		break;
	default:
		cw1200_itp_err(priv, -EINVAL, 43);
		break;
	}

	len = snprintf(buf+size, ITP_BUF_SIZE-size, "\n");
	if (len <= 0) {
		cw1200_itp_err(priv, -EINVAL, 44);
		return;
	}
	size += len;

	skb = dev_alloc_skb(size);
	if (!skb) {
		cw1200_itp_err(priv, -ENOMEM, 45);
		return;
	}

	skb_trim(skb, 0);
	skb_put(skb, size);

	memcpy(skb->data, buf, size);
	skb_queue_tail(&itp->log_queue, skb);
	wake_up(&itp->read_wait);
}

int cw1200_itp_get_tx(struct cw1200_common *priv, u8 **data,
		size_t *tx_len, int *burst)
{
	struct cw1200_itp *itp;
	struct timespec now;
	int time_left_us;

	if (!priv->debug)
		return 0;

	itp	= &priv->debug->itp;

	if (!itp)
		return 0;

	spin_lock_bh(&itp->tx_lock);
	if (atomic_read(&itp->test_mode) != TEST_MODE_TX_TEST)
		goto out;

	if (atomic_read(&itp->stop_tx))
		goto out;

	if (itp->number == 0) {
		atomic_set(&itp->stop_tx, 1);
		queue_delayed_work(priv->workqueue, &itp->tx_finish, HZ/10);
		goto out;
	}

	if (!itp->data)
		goto out;

	if (priv->hw_bufs_used >= 2) {
		if (!atomic_read(&priv->bh_rx))
			atomic_set(&priv->bh_rx, 1);
		atomic_set(&priv->bh_tx, 1);
		goto out;
	}

	ktime_get_ts(&now);
	time_left_us = (itp->last_sent.tv_sec -	now.tv_sec)*1000000 +
		(itp->last_sent.tv_nsec - now.tv_nsec)/1000 +
		itp->interval_us;

	if (time_left_us > ITP_TIME_THRES_US) {
		queue_delayed_work(priv->workqueue, &itp->tx_work,
				   ITP_US_TO_MS(time_left_us)*HZ/1000);
		goto out;
	}

	if (time_left_us > 50)
		udelay(time_left_us);

	if (itp->number > 0)
		itp->number--;

	*data = itp->data;
	*tx_len = itp->data_len + itp->hdr_len;

	if (itp->data_mode == ITP_DATA_RANDOM)
		cw1200_itp_fill_pattern(&itp->data[itp->hdr_len],
					itp->data_len, itp->data_mode);
	*burst = 2;
	atomic_set(&priv->bh_tx, 1);
	ktime_get_ts(&itp->last_sent);
	atomic_add(1, &itp->awaiting_confirm);
	spin_unlock_bh(&itp->tx_lock);
	return 1;

out:
	spin_unlock_bh(&itp->tx_lock);
	return 0;
}

bool cw1200_itp_rxed(struct cw1200_common *priv, struct sk_buff *skb)
{
	struct cw1200_itp *itp = &priv->debug->itp;
	struct ieee80211_rx_status *rx = IEEE80211_SKB_RXCB(skb);
	int signal;

	if (atomic_read(&itp->test_mode) != TEST_MODE_RX_TEST)
		return cw1200_is_itp(priv);
	if (rx->freq != priv->channel->center_freq)
		return true;

	signal = rx->signal;
	itp->rx_cnt++;
	itp->rx_rssi += signal;
	if (itp->rx_rssi_min > rx->signal)
		itp->rx_rssi_min = rx->signal;
	if (itp->rx_rssi_max < rx->signal)
		itp->rx_rssi_max = rx->signal;

	return true;
}

void cw1200_itp_wake_up_tx(struct cw1200_common *priv)
{
	wake_up(&priv->debug->itp.write_wait);
}

bool cw1200_itp_tx_running(struct cw1200_common *priv)
{
	if (atomic_read(&priv->debug->itp.awaiting_confirm) ||
	    atomic_read(&priv->debug->itp.test_mode) ==
	    TEST_MODE_TX_TEST) {
		atomic_sub(1, &priv->debug->itp.awaiting_confirm);
		return true;
	}
	return false;
}

static void cw1200_itp_handle(struct cw1200_common *priv,
			      struct sk_buff *skb)
{
	struct cw1200_itp *itp = &priv->debug->itp;
	const struct wiphy *wiphy = priv->hw->wiphy;
	int cmd;
	int ret;

	pr_debug("[ITP] <<< %s", skb->data);
	if (sscanf(skb->data, "%d", &cmd) != 1) {
		cw1200_itp_err(priv, -EINVAL, 1);
		return;
	}

	switch (cmd) {
	case 1: /* RX test */
		if (atomic_read(&itp->test_mode)) {
			cw1200_itp_err(priv, -EBUSY, 0);
			return;
		}
		ret = sscanf(skb->data, "%d,%d,%d",
				&cmd, &itp->band, &itp->ch);
		if (ret != 3) {
			cw1200_itp_err(priv, -EINVAL, ret + 1);
			return;
		}
		if (itp->band >= 2) {
			cw1200_itp_err(priv, -EINVAL, 2);
		} else if (!wiphy->bands[itp->band]) {
			cw1200_itp_err(priv, -EINVAL, 2);
		} else if (itp->ch >= wiphy->bands[itp->band]->n_channels) {
			cw1200_itp_err(priv, -EINVAL, 3);
		} else {
			cw1200_itp_rx_stats(priv);
			cw1200_itp_rx_start(priv);
		}
		break;
	case 2: /* RX stat */
		cw1200_itp_rx_stats(priv);
		break;
	case 3: /* RX/TX stop */
		if (atomic_read(&itp->test_mode) == TEST_MODE_RX_TEST) {
			cw1200_itp_rx_stats(priv);
			cw1200_itp_rx_stop(priv);
		} else if (atomic_read(&itp->test_mode) == TEST_MODE_TX_TEST) {
			cw1200_itp_tx_stop(priv);
		} else {
			cw1200_itp_err(priv, -EBUSY, 0);
		}
		break;
	case 4: /* TX start */
		if (atomic_read(&itp->test_mode) != TEST_MODE_NO_TEST) {
			cw1200_itp_err(priv, -EBUSY, 0);
			return;
		}
		ret = sscanf(skb->data, "%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
				&cmd, &itp->band, &itp->ch, &itp->rate,
				&itp->preamble, &itp->number, &itp->data_mode,
				&itp->interval_us, &itp->power, &itp->data_len);
		if (ret != 10) {
			cw1200_itp_err(priv, -EINVAL, ret + 1);
			return;
		}
		if (itp->band >= 2) {
			cw1200_itp_err(priv, -EINVAL, 2);
		} else if (!wiphy->bands[itp->band]) {
			cw1200_itp_err(priv, -EINVAL, 2);
		} else if (itp->ch >= wiphy->bands[itp->band]->n_channels) {
			cw1200_itp_err(priv, -EINVAL, 3);
		} else if (itp->rate >= 20) {
			cw1200_itp_err(priv, -EINVAL, 4);
		} else if (itp->preamble >= ITP_PREAMBLE_MAX) {
			cw1200_itp_err(priv, -EINVAL, 5);
		} else if (itp->data_mode >= ITP_DATA_MAX_MODE) {
			cw1200_itp_err(priv, -EINVAL, 7);
		} else if (itp->data_len < ITP_MIN_DATA_SIZE ||
			   itp->data_len > (priv->wsm_caps.input_buffer_size - itp->hdr_len)) {
			cw1200_itp_err(priv, -EINVAL, 8);
		} else {
		    cw1200_itp_tx_start(priv);
		}
		break;
	case 5:
		cw1200_itp_get_version(priv, ITP_CHIP_ID);
		break;
	case 6:
		cw1200_itp_get_version(priv, ITP_FW_VER);
		break;
	}
}

static void cw1200_itp_err(struct cw1200_common *priv,
			   int err, int arg)
{
	struct cw1200_itp *itp = &priv->debug->itp;
	struct sk_buff *skb;
	static char buf[255];
	int len;

	len = snprintf(buf, sizeof(buf), "%d,%d\n",
		err, arg);
	if (len <= 0)
		return;

	skb = dev_alloc_skb(len);
	if (!skb)
		return;

	skb_trim(skb, 0);
	skb_put(skb, len);

	memcpy(skb->data, buf, len);
	skb_queue_tail(&itp->log_queue, skb);
	wake_up(&itp->read_wait);

	len = sprint_symbol(buf,
			(unsigned long)__builtin_return_address(0));
	if (len <= 0)
		return;
	pr_debug("[ITP] error %d,%d from %s\n",
		 err, arg, buf);
}