aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/wl12xx/scan.c
blob: 128ccb79318c86c7e0a8bc4a65c61389b58e959f (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
/*
 * This file is part of wl1271
 *
 * Copyright (C) 2009-2010 Nokia Corporation
 *
 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/ieee80211.h>

#include "wl12xx.h"
#include "cmd.h"
#include "scan.h"
#include "acx.h"
#include "ps.h"
#include "tx.h"

void wl1271_scan_complete_work(struct work_struct *work)
{
	struct delayed_work *dwork;
	struct wl1271 *wl;
	int ret;
	bool is_sta, is_ibss;

	dwork = container_of(work, struct delayed_work, work);
	wl = container_of(dwork, struct wl1271, scan_complete_work);

	wl1271_debug(DEBUG_SCAN, "Scanning complete");

	mutex_lock(&wl->mutex);

	if (wl->state == WL1271_STATE_OFF)
		goto out;

	if (wl->scan.state == WL1271_SCAN_STATE_IDLE)
		goto out;

	wl->scan.state = WL1271_SCAN_STATE_IDLE;
	memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
	wl->scan.req = NULL;

	ret = wl1271_ps_elp_wakeup(wl);
	if (ret < 0)
		goto out;

	if (test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags)) {
		/* restore hardware connection monitoring template */
		wl1271_cmd_build_ap_probe_req(wl, wl->probereq);
	}

	/* return to ROC if needed */
	is_sta = (wl->bss_type == BSS_TYPE_STA_BSS);
	is_ibss = (wl->bss_type == BSS_TYPE_IBSS);
	if (((is_sta && !test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags)) ||
	     (is_ibss && !test_bit(WL1271_FLAG_IBSS_JOINED, &wl->flags))) &&
	    !test_bit(wl->dev_role_id, wl->roc_map)) {
		/* restore remain on channel */
		wl12xx_cmd_role_start_dev(wl);
		wl12xx_roc(wl, wl->dev_role_id);
	}
	wl1271_ps_elp_sleep(wl);

	if (wl->scan.failed) {
		wl1271_info("Scan completed due to error.");
		wl12xx_queue_recovery_work(wl);
	}

	ieee80211_scan_completed(wl->hw, false);

out:
	mutex_unlock(&wl->mutex);

}


static int wl1271_get_scan_channels(struct wl1271 *wl,
				    struct cfg80211_scan_request *req,
				    struct basic_scan_channel_params *channels,
				    enum ieee80211_band band, bool passive)
{
	struct conf_scan_settings *c = &wl->conf.scan;
	int i, j;
	u32 flags;

	for (i = 0, j = 0;
	     i < req->n_channels && j < WL1271_SCAN_MAX_CHANNELS;
	     i++) {
		flags = req->channels[i]->flags;

		if (!test_bit(i, wl->scan.scanned_ch) &&
		    !(flags & IEEE80211_CHAN_DISABLED) &&
		    (req->channels[i]->band == band) &&
		    /*
		     * In passive scans, we scan all remaining
		     * channels, even if not marked as such.
		     * In active scans, we only scan channels not
		     * marked as passive.
		     */
		    (passive || !(flags & IEEE80211_CHAN_PASSIVE_SCAN))) {
			wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
				     req->channels[i]->band,
				     req->channels[i]->center_freq);
			wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
				     req->channels[i]->hw_value,
				     req->channels[i]->flags);
			wl1271_debug(DEBUG_SCAN,
				     "max_antenna_gain %d, max_power %d",
				     req->channels[i]->max_antenna_gain,
				     req->channels[i]->max_power);
			wl1271_debug(DEBUG_SCAN, "beacon_found %d",
				     req->channels[i]->beacon_found);

			if (!passive) {
				channels[j].min_duration =
					cpu_to_le32(c->min_dwell_time_active);
				channels[j].max_duration =
					cpu_to_le32(c->max_dwell_time_active);
			} else {
				channels[j].min_duration =
					cpu_to_le32(c->min_dwell_time_passive);
				channels[j].max_duration =
					cpu_to_le32(c->max_dwell_time_passive);
			}
			channels[j].early_termination = 0;
			channels[j].tx_power_att = req->channels[i]->max_power;
			channels[j].channel = req->channels[i]->hw_value;

			memset(&channels[j].bssid_lsb, 0xff, 4);
			memset(&channels[j].bssid_msb, 0xff, 2);

			/* Mark the channels we already used */
			set_bit(i, wl->scan.scanned_ch);

			j++;
		}
	}

	return j;
}

#define WL1271_NOTHING_TO_SCAN 1

static int wl1271_scan_send(struct wl1271 *wl, enum ieee80211_band band,
			     bool passive, u32 basic_rate)
{
	struct wl1271_cmd_scan *cmd;
	struct wl1271_cmd_trigger_scan_to *trigger;
	int ret;
	u16 scan_options = 0;

	/* skip active scans if we don't have SSIDs */
	if (!passive && wl->scan.req->n_ssids == 0)
		return WL1271_NOTHING_TO_SCAN;

	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
	if (!cmd || !trigger) {
		ret = -ENOMEM;
		goto out;
	}

	if (passive)
		scan_options |= WL1271_SCAN_OPT_PASSIVE;

	if (WARN_ON(wl->role_id == WL12XX_INVALID_ROLE_ID)) {
		ret = -EINVAL;
		goto out;
	}
	cmd->params.role_id = wl->role_id;
	cmd->params.scan_options = cpu_to_le16(scan_options);

	cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req,
						    cmd->channels,
						    band, passive);
	if (cmd->params.n_ch == 0) {
		ret = WL1271_NOTHING_TO_SCAN;
		goto out;
	}

	cmd->params.tx_rate = cpu_to_le32(basic_rate);
	cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs;
	cmd->params.tx_rate = cpu_to_le32(basic_rate);
	cmd->params.tid_trigger = 0;
	cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;

	if (band == IEEE80211_BAND_2GHZ)
		cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ;
	else
		cmd->params.band = WL1271_SCAN_BAND_5_GHZ;

	if (wl->scan.ssid_len && wl->scan.ssid) {
		cmd->params.ssid_len = wl->scan.ssid_len;
		memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len);
	}

	memcpy(cmd->addr, wl->mac_addr, ETH_ALEN);

	ret = wl1271_cmd_build_probe_req(wl, wl->scan.ssid, wl->scan.ssid_len,
					 wl->scan.req->ie, wl->scan.req->ie_len,
					 band);
	if (ret < 0) {
		wl1271_error("PROBE request template failed");
		goto out;
	}

	/* disable the timeout */
	trigger->timeout = 0;
	ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
			      sizeof(*trigger), 0);
	if (ret < 0) {
		wl1271_error("trigger scan to failed for hw scan");
		goto out;
	}

	wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));

	ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
	if (ret < 0) {
		wl1271_error("SCAN failed");
		goto out;
	}

out:
	kfree(cmd);
	kfree(trigger);
	return ret;
}

void wl1271_scan_stm(struct wl1271 *wl)
{
	int ret = 0;
	enum ieee80211_band band;
	u32 rate;

	switch (wl->scan.state) {
	case WL1271_SCAN_STATE_IDLE:
		break;

	case WL1271_SCAN_STATE_2GHZ_ACTIVE:
		band = IEEE80211_BAND_2GHZ;
		rate = wl1271_tx_min_rate_get(wl, wl->bitrate_masks[band]);
		ret = wl1271_scan_send(wl, band, false, rate);
		if (ret == WL1271_NOTHING_TO_SCAN) {
			wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE;
			wl1271_scan_stm(wl);
		}

		break;

	case WL1271_SCAN_STATE_2GHZ_PASSIVE:
		band = IEEE80211_BAND_2GHZ;
		rate = wl1271_tx_min_rate_get(wl, wl->bitrate_masks[band]);
		ret = wl1271_scan_send(wl, band, true, rate);
		if (ret == WL1271_NOTHING_TO_SCAN) {
			if (wl->enable_11a)
				wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE;
			else
				wl->scan.state = WL1271_SCAN_STATE_DONE;
			wl1271_scan_stm(wl);
		}

		break;

	case WL1271_SCAN_STATE_5GHZ_ACTIVE:
		band = IEEE80211_BAND_5GHZ;
		rate = wl1271_tx_min_rate_get(wl, wl->bitrate_masks[band]);
		ret = wl1271_scan_send(wl, band, false, rate);
		if (ret == WL1271_NOTHING_TO_SCAN) {
			wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE;
			wl1271_scan_stm(wl);
		}

		break;

	case WL1271_SCAN_STATE_5GHZ_PASSIVE:
		band = IEEE80211_BAND_5GHZ;
		rate = wl1271_tx_min_rate_get(wl, wl->bitrate_masks[band]);
		ret = wl1271_scan_send(wl, band, true, rate);
		if (ret == WL1271_NOTHING_TO_SCAN) {
			wl->scan.state = WL1271_SCAN_STATE_DONE;
			wl1271_scan_stm(wl);
		}

		break;

	case WL1271_SCAN_STATE_DONE:
		wl->scan.failed = false;
		cancel_delayed_work(&wl->scan_complete_work);
		ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
					     msecs_to_jiffies(0));
		break;

	default:
		wl1271_error("invalid scan state");
		break;
	}

	if (ret < 0) {
		cancel_delayed_work(&wl->scan_complete_work);
		ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
					     msecs_to_jiffies(0));
	}
}

int wl1271_scan(struct wl1271 *wl, const u8 *ssid, size_t ssid_len,
		struct cfg80211_scan_request *req)
{
	/*
	 * cfg80211 should guarantee that we don't get more channels
	 * than what we have registered.
	 */
	BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);

	if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
		return -EBUSY;

	wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;

	if (ssid_len && ssid) {
		wl->scan.ssid_len = ssid_len;
		memcpy(wl->scan.ssid, ssid, ssid_len);
	} else {
		wl->scan.ssid_len = 0;
	}

	wl->scan.req = req;
	memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));

	/* we assume failure so that timeout scenarios are handled correctly */
	wl->scan.failed = true;
	ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
				     msecs_to_jiffies(WL1271_SCAN_TIMEOUT));

	wl1271_scan_stm(wl);

	return 0;
}

int wl1271_scan_stop(struct wl1271 *wl)
{
	struct wl1271_cmd_header *cmd = NULL;
	int ret = 0;

	if (WARN_ON(wl->scan.state == WL1271_SCAN_STATE_IDLE))
		return -EINVAL;

	wl1271_debug(DEBUG_CMD, "cmd scan stop");

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

	ret = wl1271_cmd_send(wl, CMD_STOP_SCAN, cmd,
			      sizeof(*cmd), 0);
	if (ret < 0) {
		wl1271_error("cmd stop_scan failed");
		goto out;
	}
out:
	kfree(cmd);
	return ret;
}

static int
wl1271_scan_get_sched_scan_channels(struct wl1271 *wl,
				    struct cfg80211_sched_scan_request *req,
				    struct conn_scan_ch_params *channels,
				    u32 band, bool radar, bool passive,
				    int start, int max_channels)
{
	struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
	int i, j;
	u32 flags;
	bool force_passive = !req->n_ssids;

	for (i = 0, j = start;
	     i < req->n_channels && j < max_channels;
	     i++) {
		flags = req->channels[i]->flags;

		if (force_passive)
			flags |= IEEE80211_CHAN_PASSIVE_SCAN;

		if ((req->channels[i]->band == band) &&
		    !(flags & IEEE80211_CHAN_DISABLED) &&
		    (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
		    /* if radar is set, we ignore the passive flag */
		    (radar ||
		     !!(flags & IEEE80211_CHAN_PASSIVE_SCAN) == passive)) {
			wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
				     req->channels[i]->band,
				     req->channels[i]->center_freq);
			wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
				     req->channels[i]->hw_value,
				     req->channels[i]->flags);
			wl1271_debug(DEBUG_SCAN, "max_power %d",
				     req->channels[i]->max_power);

			if (flags & IEEE80211_CHAN_RADAR) {
				channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
				channels[j].passive_duration =
					cpu_to_le16(c->dwell_time_dfs);
			}
			else if (flags & IEEE80211_CHAN_PASSIVE_SCAN) {
				channels[j].passive_duration =
					cpu_to_le16(c->dwell_time_passive);
			} else {
				channels[j].min_duration =
					cpu_to_le16(c->min_dwell_time_active);
				channels[j].max_duration =
					cpu_to_le16(c->max_dwell_time_active);
			}
			channels[j].tx_power_att = req->channels[i]->max_power;
			channels[j].channel = req->channels[i]->hw_value;

			j++;
		}
	}

	return j - start;
}

static bool
wl1271_scan_sched_scan_channels(struct wl1271 *wl,
				struct cfg80211_sched_scan_request *req,
				struct wl1271_cmd_sched_scan_config *cfg)
{
	cfg->passive[0] =
		wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_2,
						    IEEE80211_BAND_2GHZ,
						    false, true, 0,
						    MAX_CHANNELS_2GHZ);
	cfg->active[0] =
		wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_2,
						    IEEE80211_BAND_2GHZ,
						    false, false,
						    cfg->passive[0],
						    MAX_CHANNELS_2GHZ);
	cfg->passive[1] =
		wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_5,
						    IEEE80211_BAND_5GHZ,
						    false, true, 0,
						    MAX_CHANNELS_5GHZ);
	cfg->dfs =
		wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_5,
						    IEEE80211_BAND_5GHZ,
						    true, true,
						    cfg->passive[1],
						    MAX_CHANNELS_5GHZ);
	cfg->active[1] =
		wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_5,
						    IEEE80211_BAND_5GHZ,
						    false, false,
						    cfg->passive[1] + cfg->dfs,
						    MAX_CHANNELS_5GHZ);
	/* 802.11j channels are not supported yet */
	cfg->passive[2] = 0;
	cfg->active[2] = 0;

	wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
		     cfg->active[0], cfg->passive[0]);
	wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
		     cfg->active[1], cfg->passive[1]);
	wl1271_debug(DEBUG_SCAN, "    DFS: %d", cfg->dfs);

	return  cfg->passive[0] || cfg->active[0] ||
		cfg->passive[1] || cfg->active[1] || cfg->dfs ||
		cfg->passive[2] || cfg->active[2];
}

/* Returns the scan type to be used or a negative value on error */
static int
wl12xx_scan_sched_scan_ssid_list(struct wl1271 *wl,
				 struct cfg80211_sched_scan_request *req)
{
	struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
	struct cfg80211_match_set *sets = req->match_sets;
	struct cfg80211_ssid *ssids = req->ssids;
	int ret = 0, type, i, j, n_match_ssids = 0;

	wl1271_debug(DEBUG_CMD, "cmd sched scan ssid list");

	/* count the match sets that contain SSIDs */
	for (i = 0; i < req->n_match_sets; i++)
		if (sets[i].ssid.ssid_len > 0)
			n_match_ssids++;

	/* No filter, no ssids or only bcast ssid */
	if (!n_match_ssids &&
	    (!req->n_ssids ||
	     (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
		type = SCAN_SSID_FILTER_ANY;
		goto out;
	}

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

	if (!n_match_ssids) {
		/* No filter, with ssids */
		type = SCAN_SSID_FILTER_DISABLED;

		for (i = 0; i < req->n_ssids; i++) {
			cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
				SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
			cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
			memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
			       ssids[i].ssid_len);
			cmd->n_ssids++;
		}
	} else {
		type = SCAN_SSID_FILTER_LIST;

		/* Add all SSIDs from the filters */
		for (i = 0; i < req->n_match_sets; i++) {
			/* ignore sets without SSIDs */
			if (!sets[i].ssid.ssid_len)
				continue;

			cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
			cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
			memcpy(cmd->ssids[cmd->n_ssids].ssid,
			       sets[i].ssid.ssid, sets[i].ssid.ssid_len);
			cmd->n_ssids++;
		}
		if ((req->n_ssids > 1) ||
		    (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
			/*
			 * Mark all the SSIDs passed in the SSID list as HIDDEN,
			 * so they're used in probe requests.
			 */
			for (i = 0; i < req->n_ssids; i++) {
				for (j = 0; j < cmd->n_ssids; j++)
					if (!memcmp(req->ssids[i].ssid,
						   cmd->ssids[j].ssid,
						   req->ssids[i].ssid_len)) {
						cmd->ssids[j].type =
							SCAN_SSID_TYPE_HIDDEN;
						break;
					}
				/* Fail if SSID isn't present in the filters */
				if (j == req->n_ssids) {
					ret = -EINVAL;
					goto out_free;
				}
			}
		}
	}

	wl1271_dump(DEBUG_SCAN, "SSID_LIST: ", cmd, sizeof(*cmd));

	ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
			      sizeof(*cmd), 0);
	if (ret < 0) {
		wl1271_error("cmd sched scan ssid list failed");
		goto out_free;
	}

out_free:
	kfree(cmd);
out:
	if (ret < 0)
		return ret;
	return type;
}

int wl1271_scan_sched_scan_config(struct wl1271 *wl,
				  struct cfg80211_sched_scan_request *req,
				  struct ieee80211_sched_scan_ies *ies)
{
	struct wl1271_cmd_sched_scan_config *cfg = NULL;
	struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
	int i, ret;
	bool force_passive = !req->n_ssids;

	wl1271_debug(DEBUG_CMD, "cmd sched_scan scan config");

	cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
	if (!cfg)
		return -ENOMEM;

	cfg->rssi_threshold = c->rssi_threshold;
	cfg->snr_threshold  = c->snr_threshold;
	cfg->n_probe_reqs = c->num_probe_reqs;
	/* cycles set to 0 it means infinite (until manually stopped) */
	cfg->cycles = 0;
	/* report APs when at least 1 is found */
	cfg->report_after = 1;
	/* don't stop scanning automatically when something is found */
	cfg->terminate = 0;
	cfg->tag = WL1271_SCAN_DEFAULT_TAG;
	/* don't filter on BSS type */
	cfg->bss_type = SCAN_BSS_TYPE_ANY;
	/* currently NL80211 supports only a single interval */
	for (i = 0; i < SCAN_MAX_CYCLE_INTERVALS; i++)
		cfg->intervals[i] = cpu_to_le32(req->interval);

	cfg->ssid_len = 0;
	ret = wl12xx_scan_sched_scan_ssid_list(wl, req);
	if (ret < 0)
		goto out;

	cfg->filter_type = ret;

	wl1271_debug(DEBUG_SCAN, "filter_type = %d", cfg->filter_type);

	if (!wl1271_scan_sched_scan_channels(wl, req, cfg)) {
		wl1271_error("scan channel list is empty");
		ret = -EINVAL;
		goto out;
	}

	if (!force_passive && cfg->active[0]) {
		ret = wl1271_cmd_build_probe_req(wl, req->ssids[0].ssid,
						 req->ssids[0].ssid_len,
						 ies->ie[IEEE80211_BAND_2GHZ],
						 ies->len[IEEE80211_BAND_2GHZ],
						 IEEE80211_BAND_2GHZ);
		if (ret < 0) {
			wl1271_error("2.4GHz PROBE request template failed");
			goto out;
		}
	}

	if (!force_passive && cfg->active[1]) {
		ret = wl1271_cmd_build_probe_req(wl,  req->ssids[0].ssid,
						 req->ssids[0].ssid_len,
						 ies->ie[IEEE80211_BAND_5GHZ],
						 ies->len[IEEE80211_BAND_5GHZ],
						 IEEE80211_BAND_5GHZ);
		if (ret < 0) {
			wl1271_error("5GHz PROBE request template failed");
			goto out;
		}
	}

	wl1271_dump(DEBUG_SCAN, "SCAN_CFG: ", cfg, sizeof(*cfg));

	ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_CFG, cfg,
			      sizeof(*cfg), 0);
	if (ret < 0) {
		wl1271_error("SCAN configuration failed");
		goto out;
	}
out:
	kfree(cfg);
	return ret;
}

int wl1271_scan_sched_scan_start(struct wl1271 *wl)
{
	struct wl1271_cmd_sched_scan_start *start;
	int ret = 0;

	wl1271_debug(DEBUG_CMD, "cmd periodic scan start");

	if (wl->bss_type != BSS_TYPE_STA_BSS)
		return -EOPNOTSUPP;

	if (!test_bit(WL1271_FLAG_IDLE, &wl->flags))
		return -EBUSY;

	start = kzalloc(sizeof(*start), GFP_KERNEL);
	if (!start)
		return -ENOMEM;

	start->tag = WL1271_SCAN_DEFAULT_TAG;

	ret = wl1271_cmd_send(wl, CMD_START_PERIODIC_SCAN, start,
			      sizeof(*start), 0);
	if (ret < 0) {
		wl1271_error("failed to send scan start command");
		goto out_free;
	}

out_free:
	kfree(start);
	return ret;
}

void wl1271_scan_sched_scan_results(struct wl1271 *wl)
{
	wl1271_debug(DEBUG_SCAN, "got periodic scan results");

	ieee80211_sched_scan_results(wl->hw);
}

void wl1271_scan_sched_scan_stop(struct wl1271 *wl)
{
	struct wl1271_cmd_sched_scan_stop *stop;
	int ret = 0;

	wl1271_debug(DEBUG_CMD, "cmd periodic scan stop");

	/* FIXME: what to do if alloc'ing to stop fails? */
	stop = kzalloc(sizeof(*stop), GFP_KERNEL);
	if (!stop) {
		wl1271_error("failed to alloc memory to send sched scan stop");
		return;
	}

	stop->tag = WL1271_SCAN_DEFAULT_TAG;

	ret = wl1271_cmd_send(wl, CMD_STOP_PERIODIC_SCAN, stop,
			      sizeof(*stop), 0);
	if (ret < 0) {
		wl1271_error("failed to send sched scan stop command");
		goto out_free;
	}
	wl->sched_scanning = false;

out_free:
	kfree(stop);
}