1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * This file is part of wl1271
4 *
5 * Copyright (C) 2009-2010 Nokia Corporation
6 *
7 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
8 */
9
10#include <linux/ieee80211.h>
11#include <linux/pm_runtime.h>
12
13#include "wlcore.h"
14#include "debug.h"
15#include "cmd.h"
16#include "scan.h"
17#include "acx.h"
18#include "tx.h"
19
20void wl1271_scan_complete_work(struct work_struct *work)
21{
22	struct delayed_work *dwork;
23	struct wl1271 *wl;
24	struct wl12xx_vif *wlvif;
25	struct cfg80211_scan_info info = {
26		.aborted = false,
27	};
28	int ret;
29
30	dwork = to_delayed_work(work);
31	wl = container_of(dwork, struct wl1271, scan_complete_work);
32
33	wl1271_debug(DEBUG_SCAN, "Scanning complete");
34
35	mutex_lock(&wl->mutex);
36
37	if (unlikely(wl->state != WLCORE_STATE_ON))
38		goto out;
39
40	if (wl->scan.state == WL1271_SCAN_STATE_IDLE)
41		goto out;
42
43	wlvif = wl->scan_wlvif;
44
45	/*
46	 * Rearm the tx watchdog just before idling scan. This
47	 * prevents just-finished scans from triggering the watchdog
48	 */
49	wl12xx_rearm_tx_watchdog_locked(wl);
50
51	wl->scan.state = WL1271_SCAN_STATE_IDLE;
52	memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
53	wl->scan.req = NULL;
54	wl->scan_wlvif = NULL;
55
56	ret = pm_runtime_resume_and_get(wl->dev);
57	if (ret < 0)
58		goto out;
59
60	if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags)) {
61		/* restore hardware connection monitoring template */
62		wl1271_cmd_build_ap_probe_req(wl, wlvif, wlvif->probereq);
63	}
64
65	if (wl->scan.failed) {
66		wl1271_info("Scan completed due to error.");
67		wl12xx_queue_recovery_work(wl);
68	}
69
70	wlcore_cmd_regdomain_config_locked(wl);
71
72	pm_runtime_mark_last_busy(wl->dev);
73	pm_runtime_put_autosuspend(wl->dev);
74
75	ieee80211_scan_completed(wl->hw, &info);
76
77out:
78	mutex_unlock(&wl->mutex);
79
80}
81
82static void wlcore_started_vifs_iter(void *data, u8 *mac,
83				     struct ieee80211_vif *vif)
84{
85	struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
86	bool active = false;
87	int *count = (int *)data;
88
89	/*
90	 * count active interfaces according to interface type.
91	 * checking only bss_conf.idle is bad for some cases, e.g.
92	 * we don't want to count sta in p2p_find as active interface.
93	 */
94	switch (wlvif->bss_type) {
95	case BSS_TYPE_STA_BSS:
96		if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags))
97			active = true;
98		break;
99
100	case BSS_TYPE_AP_BSS:
101		if (wlvif->wl->active_sta_count > 0)
102			active = true;
103		break;
104
105	default:
106		break;
107	}
108
109	if (active)
110		(*count)++;
111}
112
113static int wlcore_count_started_vifs(struct wl1271 *wl)
114{
115	int count = 0;
116
117	ieee80211_iterate_active_interfaces_atomic(wl->hw,
118					IEEE80211_IFACE_ITER_RESUME_ALL,
119					wlcore_started_vifs_iter, &count);
120	return count;
121}
122
123static int
124wlcore_scan_get_channels(struct wl1271 *wl,
125			 struct ieee80211_channel *req_channels[],
126			 u32 n_channels,
127			 u32 n_ssids,
128			 struct conn_scan_ch_params *channels,
129			 u32 band, bool radar, bool passive,
130			 int start, int max_channels,
131			 u8 *n_pactive_ch,
132			 int scan_type)
133{
134	int i, j;
135	u32 flags;
136	bool force_passive = !n_ssids;
137	u32 min_dwell_time_active, max_dwell_time_active;
138	u32 dwell_time_passive, dwell_time_dfs;
139
140	/* configure dwell times according to scan type */
141	if (scan_type == SCAN_TYPE_SEARCH) {
142		struct conf_scan_settings *c = &wl->conf.scan;
143		bool active_vif_exists = !!wlcore_count_started_vifs(wl);
144
145		min_dwell_time_active = active_vif_exists ?
146			c->min_dwell_time_active :
147			c->min_dwell_time_active_long;
148		max_dwell_time_active = active_vif_exists ?
149			c->max_dwell_time_active :
150			c->max_dwell_time_active_long;
151		dwell_time_passive = c->dwell_time_passive;
152		dwell_time_dfs = c->dwell_time_dfs;
153	} else {
154		struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
155		u32 delta_per_probe;
156
157		if (band == NL80211_BAND_5GHZ)
158			delta_per_probe = c->dwell_time_delta_per_probe_5;
159		else
160			delta_per_probe = c->dwell_time_delta_per_probe;
161
162		min_dwell_time_active = c->base_dwell_time +
163			 n_ssids * c->num_probe_reqs * delta_per_probe;
164
165		max_dwell_time_active = min_dwell_time_active +
166					c->max_dwell_time_delta;
167		dwell_time_passive = c->dwell_time_passive;
168		dwell_time_dfs = c->dwell_time_dfs;
169	}
170	min_dwell_time_active = DIV_ROUND_UP(min_dwell_time_active, 1000);
171	max_dwell_time_active = DIV_ROUND_UP(max_dwell_time_active, 1000);
172	dwell_time_passive = DIV_ROUND_UP(dwell_time_passive, 1000);
173	dwell_time_dfs = DIV_ROUND_UP(dwell_time_dfs, 1000);
174
175	for (i = 0, j = start;
176	     i < n_channels && j < max_channels;
177	     i++) {
178		flags = req_channels[i]->flags;
179
180		if (force_passive)
181			flags |= IEEE80211_CHAN_NO_IR;
182
183		if ((req_channels[i]->band == band) &&
184		    !(flags & IEEE80211_CHAN_DISABLED) &&
185		    (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
186		    /* if radar is set, we ignore the passive flag */
187		    (radar ||
188		     !!(flags & IEEE80211_CHAN_NO_IR) == passive)) {
189			if (flags & IEEE80211_CHAN_RADAR) {
190				channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
191
192				channels[j].passive_duration =
193					cpu_to_le16(dwell_time_dfs);
194			} else {
195				channels[j].passive_duration =
196					cpu_to_le16(dwell_time_passive);
197			}
198
199			channels[j].min_duration =
200				cpu_to_le16(min_dwell_time_active);
201			channels[j].max_duration =
202				cpu_to_le16(max_dwell_time_active);
203
204			channels[j].tx_power_att = req_channels[i]->max_power;
205			channels[j].channel = req_channels[i]->hw_value;
206
207			if (n_pactive_ch &&
208			    (band == NL80211_BAND_2GHZ) &&
209			    (channels[j].channel >= 12) &&
210			    (channels[j].channel <= 14) &&
211			    (flags & IEEE80211_CHAN_NO_IR) &&
212			    !force_passive) {
213				/* pactive channels treated as DFS */
214				channels[j].flags = SCAN_CHANNEL_FLAGS_DFS;
215
216				/*
217				 * n_pactive_ch is counted down from the end of
218				 * the passive channel list
219				 */
220				(*n_pactive_ch)++;
221				wl1271_debug(DEBUG_SCAN, "n_pactive_ch = %d",
222					     *n_pactive_ch);
223			}
224
225			wl1271_debug(DEBUG_SCAN, "freq %d, ch. %d, flags 0x%x, power %d, min/max_dwell %d/%d%s%s",
226				     req_channels[i]->center_freq,
227				     req_channels[i]->hw_value,
228				     req_channels[i]->flags,
229				     req_channels[i]->max_power,
230				     min_dwell_time_active,
231				     max_dwell_time_active,
232				     flags & IEEE80211_CHAN_RADAR ?
233					", DFS" : "",
234				     flags & IEEE80211_CHAN_NO_IR ?
235					", NO-IR" : "");
236			j++;
237		}
238	}
239
240	return j - start;
241}
242
243bool
244wlcore_set_scan_chan_params(struct wl1271 *wl,
245			    struct wlcore_scan_channels *cfg,
246			    struct ieee80211_channel *channels[],
247			    u32 n_channels,
248			    u32 n_ssids,
249			    int scan_type)
250{
251	u8 n_pactive_ch = 0;
252
253	cfg->passive[0] =
254		wlcore_scan_get_channels(wl,
255					 channels,
256					 n_channels,
257					 n_ssids,
258					 cfg->channels_2,
259					 NL80211_BAND_2GHZ,
260					 false, true, 0,
261					 MAX_CHANNELS_2GHZ,
262					 &n_pactive_ch,
263					 scan_type);
264	cfg->active[0] =
265		wlcore_scan_get_channels(wl,
266					 channels,
267					 n_channels,
268					 n_ssids,
269					 cfg->channels_2,
270					 NL80211_BAND_2GHZ,
271					 false, false,
272					 cfg->passive[0],
273					 MAX_CHANNELS_2GHZ,
274					 &n_pactive_ch,
275					 scan_type);
276	cfg->passive[1] =
277		wlcore_scan_get_channels(wl,
278					 channels,
279					 n_channels,
280					 n_ssids,
281					 cfg->channels_5,
282					 NL80211_BAND_5GHZ,
283					 false, true, 0,
284					 wl->max_channels_5,
285					 &n_pactive_ch,
286					 scan_type);
287	cfg->dfs =
288		wlcore_scan_get_channels(wl,
289					 channels,
290					 n_channels,
291					 n_ssids,
292					 cfg->channels_5,
293					 NL80211_BAND_5GHZ,
294					 true, true,
295					 cfg->passive[1],
296					 wl->max_channels_5,
297					 &n_pactive_ch,
298					 scan_type);
299	cfg->active[1] =
300		wlcore_scan_get_channels(wl,
301					 channels,
302					 n_channels,
303					 n_ssids,
304					 cfg->channels_5,
305					 NL80211_BAND_5GHZ,
306					 false, false,
307					 cfg->passive[1] + cfg->dfs,
308					 wl->max_channels_5,
309					 &n_pactive_ch,
310					 scan_type);
311
312	/* 802.11j channels are not supported yet */
313	cfg->passive[2] = 0;
314	cfg->active[2] = 0;
315
316	cfg->passive_active = n_pactive_ch;
317
318	wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
319		     cfg->active[0], cfg->passive[0]);
320	wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
321		     cfg->active[1], cfg->passive[1]);
322	wl1271_debug(DEBUG_SCAN, "    DFS: %d", cfg->dfs);
323
324	return  cfg->passive[0] || cfg->active[0] ||
325		cfg->passive[1] || cfg->active[1] || cfg->dfs ||
326		cfg->passive[2] || cfg->active[2];
327}
328EXPORT_SYMBOL_GPL(wlcore_set_scan_chan_params);
329
330int wlcore_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
331		const u8 *ssid, size_t ssid_len,
332		struct cfg80211_scan_request *req)
333{
334	struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
335
336	/*
337	 * cfg80211 should guarantee that we don't get more channels
338	 * than what we have registered.
339	 */
340	BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
341
342	if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
343		return -EBUSY;
344
345	wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
346
347	if (ssid_len && ssid) {
348		wl->scan.ssid_len = ssid_len;
349		memcpy(wl->scan.ssid, ssid, ssid_len);
350	} else {
351		wl->scan.ssid_len = 0;
352	}
353
354	wl->scan_wlvif = wlvif;
355	wl->scan.req = req;
356	memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
357
358	/* we assume failure so that timeout scenarios are handled correctly */
359	wl->scan.failed = true;
360	ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
361				     msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
362
363	wl->ops->scan_start(wl, wlvif, req);
364
365	return 0;
366}
367/* Returns the scan type to be used or a negative value on error */
368int
369wlcore_scan_sched_scan_ssid_list(struct wl1271 *wl,
370				 struct wl12xx_vif *wlvif,
371				 struct cfg80211_sched_scan_request *req)
372{
373	struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
374	struct cfg80211_match_set *sets = req->match_sets;
375	struct cfg80211_ssid *ssids = req->ssids;
376	int ret = 0, type, i, j, n_match_ssids = 0;
377
378	wl1271_debug((DEBUG_CMD | DEBUG_SCAN), "cmd sched scan ssid list");
379
380	/* count the match sets that contain SSIDs */
381	for (i = 0; i < req->n_match_sets; i++)
382		if (sets[i].ssid.ssid_len > 0)
383			n_match_ssids++;
384
385	/* No filter, no ssids or only bcast ssid */
386	if (!n_match_ssids &&
387	    (!req->n_ssids ||
388	     (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
389		type = SCAN_SSID_FILTER_ANY;
390		goto out;
391	}
392
393	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
394	if (!cmd) {
395		ret = -ENOMEM;
396		goto out;
397	}
398
399	cmd->role_id = wlvif->role_id;
400	if (!n_match_ssids) {
401		/* No filter, with ssids */
402		type = SCAN_SSID_FILTER_DISABLED;
403
404		for (i = 0; i < req->n_ssids; i++) {
405			cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
406				SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
407			cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
408			memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
409			       ssids[i].ssid_len);
410			cmd->n_ssids++;
411		}
412	} else {
413		type = SCAN_SSID_FILTER_LIST;
414
415		/* Add all SSIDs from the filters */
416		for (i = 0; i < req->n_match_sets; i++) {
417			/* ignore sets without SSIDs */
418			if (!sets[i].ssid.ssid_len)
419				continue;
420
421			cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
422			cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
423			memcpy(cmd->ssids[cmd->n_ssids].ssid,
424			       sets[i].ssid.ssid, sets[i].ssid.ssid_len);
425			cmd->n_ssids++;
426		}
427		if ((req->n_ssids > 1) ||
428		    (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
429			/*
430			 * Mark all the SSIDs passed in the SSID list as HIDDEN,
431			 * so they're used in probe requests.
432			 */
433			for (i = 0; i < req->n_ssids; i++) {
434				if (!req->ssids[i].ssid_len)
435					continue;
436
437				for (j = 0; j < cmd->n_ssids; j++)
438					if ((req->ssids[i].ssid_len ==
439					     cmd->ssids[j].len) &&
440					    !memcmp(req->ssids[i].ssid,
441						   cmd->ssids[j].ssid,
442						   req->ssids[i].ssid_len)) {
443						cmd->ssids[j].type =
444							SCAN_SSID_TYPE_HIDDEN;
445						break;
446					}
447				/* Fail if SSID isn't present in the filters */
448				if (j == cmd->n_ssids) {
449					ret = -EINVAL;
450					goto out_free;
451				}
452			}
453		}
454	}
455
456	ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
457			      sizeof(*cmd), 0);
458	if (ret < 0) {
459		wl1271_error("cmd sched scan ssid list failed");
460		goto out_free;
461	}
462
463out_free:
464	kfree(cmd);
465out:
466	if (ret < 0)
467		return ret;
468	return type;
469}
470EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_ssid_list);
471
472void wlcore_scan_sched_scan_results(struct wl1271 *wl)
473{
474	wl1271_debug(DEBUG_SCAN, "got periodic scan results");
475
476	ieee80211_sched_scan_results(wl->hw);
477}
478EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_results);
479