1/*
2 * This file is part of wl1271
3 *
4 * Copyright (C) 2009-2010 Nokia Corporation
5 *
6 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 *
22 */
23
24#include <linux/ieee80211.h>
25
26#include "wlcore.h"
27#include "debug.h"
28#include "cmd.h"
29#include "scan.h"
30#include "acx.h"
31#include "ps.h"
32#include "tx.h"
33
34void wl1271_scan_complete_work(struct work_struct *work)
35{
36	struct delayed_work *dwork;
37	struct wl1271 *wl;
38	struct wl12xx_vif *wlvif;
39	int ret;
40
41	dwork = container_of(work, struct delayed_work, work);
42	wl = container_of(dwork, struct wl1271, scan_complete_work);
43
44	wl1271_debug(DEBUG_SCAN, "Scanning complete");
45
46	mutex_lock(&wl->mutex);
47
48	if (unlikely(wl->state != WLCORE_STATE_ON))
49		goto out;
50
51	if (wl->scan.state == WL1271_SCAN_STATE_IDLE)
52		goto out;
53
54	wlvif = wl->scan_wlvif;
55
56	/*
57	 * Rearm the tx watchdog just before idling scan. This
58	 * prevents just-finished scans from triggering the watchdog
59	 */
60	wl12xx_rearm_tx_watchdog_locked(wl);
61
62	wl->scan.state = WL1271_SCAN_STATE_IDLE;
63	memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
64	wl->scan.req = NULL;
65	wl->scan_wlvif = NULL;
66
67	ret = wl1271_ps_elp_wakeup(wl);
68	if (ret < 0)
69		goto out;
70
71	if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags)) {
72		/* restore hardware connection monitoring template */
73		wl1271_cmd_build_ap_probe_req(wl, wlvif, wlvif->probereq);
74	}
75
76	wl1271_ps_elp_sleep(wl);
77
78	if (wl->scan.failed) {
79		wl1271_info("Scan completed due to error.");
80		wl12xx_queue_recovery_work(wl);
81	}
82
83	wlcore_cmd_regdomain_config_locked(wl);
84
85	ieee80211_scan_completed(wl->hw, false);
86
87out:
88	mutex_unlock(&wl->mutex);
89
90}
91
92static void wlcore_started_vifs_iter(void *data, u8 *mac,
93				     struct ieee80211_vif *vif)
94{
95	struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
96	bool active = false;
97	int *count = (int *)data;
98
99	/*
100	 * count active interfaces according to interface type.
101	 * checking only bss_conf.idle is bad for some cases, e.g.
102	 * we don't want to count sta in p2p_find as active interface.
103	 */
104	switch (wlvif->bss_type) {
105	case BSS_TYPE_STA_BSS:
106		if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags))
107			active = true;
108		break;
109
110	case BSS_TYPE_AP_BSS:
111		if (wlvif->wl->active_sta_count > 0)
112			active = true;
113		break;
114
115	default:
116		break;
117	}
118
119	if (active)
120		(*count)++;
121}
122
123static int wlcore_count_started_vifs(struct wl1271 *wl)
124{
125	int count = 0;
126
127	ieee80211_iterate_active_interfaces_atomic(wl->hw,
128					IEEE80211_IFACE_ITER_RESUME_ALL,
129					wlcore_started_vifs_iter, &count);
130	return count;
131}
132
133static int
134wlcore_scan_get_channels(struct wl1271 *wl,
135			 struct ieee80211_channel *req_channels[],
136			 u32 n_channels,
137			 u32 n_ssids,
138			 struct conn_scan_ch_params *channels,
139			 u32 band, bool radar, bool passive,
140			 int start, int max_channels,
141			 u8 *n_pactive_ch,
142			 int scan_type)
143{
144	int i, j;
145	u32 flags;
146	bool force_passive = !n_ssids;
147	u32 min_dwell_time_active, max_dwell_time_active;
148	u32 dwell_time_passive, dwell_time_dfs;
149
150	/* configure dwell times according to scan type */
151	if (scan_type == SCAN_TYPE_SEARCH) {
152		struct conf_scan_settings *c = &wl->conf.scan;
153		bool active_vif_exists = !!wlcore_count_started_vifs(wl);
154
155		min_dwell_time_active = active_vif_exists ?
156			c->min_dwell_time_active :
157			c->min_dwell_time_active_long;
158		max_dwell_time_active = active_vif_exists ?
159			c->max_dwell_time_active :
160			c->max_dwell_time_active_long;
161		dwell_time_passive = c->dwell_time_passive;
162		dwell_time_dfs = c->dwell_time_dfs;
163	} else {
164		struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
165		u32 delta_per_probe;
166
167		if (band == IEEE80211_BAND_5GHZ)
168			delta_per_probe = c->dwell_time_delta_per_probe_5;
169		else
170			delta_per_probe = c->dwell_time_delta_per_probe;
171
172		min_dwell_time_active = c->base_dwell_time +
173			 n_ssids * c->num_probe_reqs * delta_per_probe;
174
175		max_dwell_time_active = min_dwell_time_active +
176					c->max_dwell_time_delta;
177		dwell_time_passive = c->dwell_time_passive;
178		dwell_time_dfs = c->dwell_time_dfs;
179	}
180	min_dwell_time_active = DIV_ROUND_UP(min_dwell_time_active, 1000);
181	max_dwell_time_active = DIV_ROUND_UP(max_dwell_time_active, 1000);
182	dwell_time_passive = DIV_ROUND_UP(dwell_time_passive, 1000);
183	dwell_time_dfs = DIV_ROUND_UP(dwell_time_dfs, 1000);
184
185	for (i = 0, j = start;
186	     i < n_channels && j < max_channels;
187	     i++) {
188		flags = req_channels[i]->flags;
189
190		if (force_passive)
191			flags |= IEEE80211_CHAN_NO_IR;
192
193		if ((req_channels[i]->band == band) &&
194		    !(flags & IEEE80211_CHAN_DISABLED) &&
195		    (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
196		    /* if radar is set, we ignore the passive flag */
197		    (radar ||
198		     !!(flags & IEEE80211_CHAN_NO_IR) == passive)) {
199			if (flags & IEEE80211_CHAN_RADAR) {
200				channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
201
202				channels[j].passive_duration =
203					cpu_to_le16(dwell_time_dfs);
204			} else {
205				channels[j].passive_duration =
206					cpu_to_le16(dwell_time_passive);
207			}
208
209			channels[j].min_duration =
210				cpu_to_le16(min_dwell_time_active);
211			channels[j].max_duration =
212				cpu_to_le16(max_dwell_time_active);
213
214			channels[j].tx_power_att = req_channels[i]->max_power;
215			channels[j].channel = req_channels[i]->hw_value;
216
217			if (n_pactive_ch &&
218			    (band == IEEE80211_BAND_2GHZ) &&
219			    (channels[j].channel >= 12) &&
220			    (channels[j].channel <= 14) &&
221			    (flags & IEEE80211_CHAN_NO_IR) &&
222			    !force_passive) {
223				/* pactive channels treated as DFS */
224				channels[j].flags = SCAN_CHANNEL_FLAGS_DFS;
225
226				/*
227				 * n_pactive_ch is counted down from the end of
228				 * the passive channel list
229				 */
230				(*n_pactive_ch)++;
231				wl1271_debug(DEBUG_SCAN, "n_pactive_ch = %d",
232					     *n_pactive_ch);
233			}
234
235			wl1271_debug(DEBUG_SCAN, "freq %d, ch. %d, flags 0x%x, power %d, min/max_dwell %d/%d%s%s",
236				     req_channels[i]->center_freq,
237				     req_channels[i]->hw_value,
238				     req_channels[i]->flags,
239				     req_channels[i]->max_power,
240				     min_dwell_time_active,
241				     max_dwell_time_active,
242				     flags & IEEE80211_CHAN_RADAR ?
243					", DFS" : "",
244				     flags & IEEE80211_CHAN_NO_IR ?
245					", NO-IR" : "");
246			j++;
247		}
248	}
249
250	return j - start;
251}
252
253bool
254wlcore_set_scan_chan_params(struct wl1271 *wl,
255			    struct wlcore_scan_channels *cfg,
256			    struct ieee80211_channel *channels[],
257			    u32 n_channels,
258			    u32 n_ssids,
259			    int scan_type)
260{
261	u8 n_pactive_ch = 0;
262
263	cfg->passive[0] =
264		wlcore_scan_get_channels(wl,
265					 channels,
266					 n_channels,
267					 n_ssids,
268					 cfg->channels_2,
269					 IEEE80211_BAND_2GHZ,
270					 false, true, 0,
271					 MAX_CHANNELS_2GHZ,
272					 &n_pactive_ch,
273					 scan_type);
274	cfg->active[0] =
275		wlcore_scan_get_channels(wl,
276					 channels,
277					 n_channels,
278					 n_ssids,
279					 cfg->channels_2,
280					 IEEE80211_BAND_2GHZ,
281					 false, false,
282					 cfg->passive[0],
283					 MAX_CHANNELS_2GHZ,
284					 &n_pactive_ch,
285					 scan_type);
286	cfg->passive[1] =
287		wlcore_scan_get_channels(wl,
288					 channels,
289					 n_channels,
290					 n_ssids,
291					 cfg->channels_5,
292					 IEEE80211_BAND_5GHZ,
293					 false, true, 0,
294					 wl->max_channels_5,
295					 &n_pactive_ch,
296					 scan_type);
297	cfg->dfs =
298		wlcore_scan_get_channels(wl,
299					 channels,
300					 n_channels,
301					 n_ssids,
302					 cfg->channels_5,
303					 IEEE80211_BAND_5GHZ,
304					 true, true,
305					 cfg->passive[1],
306					 wl->max_channels_5,
307					 &n_pactive_ch,
308					 scan_type);
309	cfg->active[1] =
310		wlcore_scan_get_channels(wl,
311					 channels,
312					 n_channels,
313					 n_ssids,
314					 cfg->channels_5,
315					 IEEE80211_BAND_5GHZ,
316					 false, false,
317					 cfg->passive[1] + cfg->dfs,
318					 wl->max_channels_5,
319					 &n_pactive_ch,
320					 scan_type);
321
322	/* 802.11j channels are not supported yet */
323	cfg->passive[2] = 0;
324	cfg->active[2] = 0;
325
326	cfg->passive_active = n_pactive_ch;
327
328	wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
329		     cfg->active[0], cfg->passive[0]);
330	wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
331		     cfg->active[1], cfg->passive[1]);
332	wl1271_debug(DEBUG_SCAN, "    DFS: %d", cfg->dfs);
333
334	return  cfg->passive[0] || cfg->active[0] ||
335		cfg->passive[1] || cfg->active[1] || cfg->dfs ||
336		cfg->passive[2] || cfg->active[2];
337}
338EXPORT_SYMBOL_GPL(wlcore_set_scan_chan_params);
339
340int wlcore_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
341		const u8 *ssid, size_t ssid_len,
342		struct cfg80211_scan_request *req)
343{
344	struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
345
346	/*
347	 * cfg80211 should guarantee that we don't get more channels
348	 * than what we have registered.
349	 */
350	BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
351
352	if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
353		return -EBUSY;
354
355	wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
356
357	if (ssid_len && ssid) {
358		wl->scan.ssid_len = ssid_len;
359		memcpy(wl->scan.ssid, ssid, ssid_len);
360	} else {
361		wl->scan.ssid_len = 0;
362	}
363
364	wl->scan_wlvif = wlvif;
365	wl->scan.req = req;
366	memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
367
368	/* we assume failure so that timeout scenarios are handled correctly */
369	wl->scan.failed = true;
370	ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
371				     msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
372
373	wl->ops->scan_start(wl, wlvif, req);
374
375	return 0;
376}
377/* Returns the scan type to be used or a negative value on error */
378int
379wlcore_scan_sched_scan_ssid_list(struct wl1271 *wl,
380				 struct wl12xx_vif *wlvif,
381				 struct cfg80211_sched_scan_request *req)
382{
383	struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
384	struct cfg80211_match_set *sets = req->match_sets;
385	struct cfg80211_ssid *ssids = req->ssids;
386	int ret = 0, type, i, j, n_match_ssids = 0;
387
388	wl1271_debug((DEBUG_CMD | DEBUG_SCAN), "cmd sched scan ssid list");
389
390	/* count the match sets that contain SSIDs */
391	for (i = 0; i < req->n_match_sets; i++)
392		if (sets[i].ssid.ssid_len > 0)
393			n_match_ssids++;
394
395	/* No filter, no ssids or only bcast ssid */
396	if (!n_match_ssids &&
397	    (!req->n_ssids ||
398	     (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
399		type = SCAN_SSID_FILTER_ANY;
400		goto out;
401	}
402
403	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
404	if (!cmd) {
405		ret = -ENOMEM;
406		goto out;
407	}
408
409	cmd->role_id = wlvif->role_id;
410	if (!n_match_ssids) {
411		/* No filter, with ssids */
412		type = SCAN_SSID_FILTER_DISABLED;
413
414		for (i = 0; i < req->n_ssids; i++) {
415			cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
416				SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
417			cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
418			memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
419			       ssids[i].ssid_len);
420			cmd->n_ssids++;
421		}
422	} else {
423		type = SCAN_SSID_FILTER_LIST;
424
425		/* Add all SSIDs from the filters */
426		for (i = 0; i < req->n_match_sets; i++) {
427			/* ignore sets without SSIDs */
428			if (!sets[i].ssid.ssid_len)
429				continue;
430
431			cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
432			cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
433			memcpy(cmd->ssids[cmd->n_ssids].ssid,
434			       sets[i].ssid.ssid, sets[i].ssid.ssid_len);
435			cmd->n_ssids++;
436		}
437		if ((req->n_ssids > 1) ||
438		    (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
439			/*
440			 * Mark all the SSIDs passed in the SSID list as HIDDEN,
441			 * so they're used in probe requests.
442			 */
443			for (i = 0; i < req->n_ssids; i++) {
444				if (!req->ssids[i].ssid_len)
445					continue;
446
447				for (j = 0; j < cmd->n_ssids; j++)
448					if ((req->ssids[i].ssid_len ==
449					     cmd->ssids[j].len) &&
450					    !memcmp(req->ssids[i].ssid,
451						   cmd->ssids[j].ssid,
452						   req->ssids[i].ssid_len)) {
453						cmd->ssids[j].type =
454							SCAN_SSID_TYPE_HIDDEN;
455						break;
456					}
457				/* Fail if SSID isn't present in the filters */
458				if (j == cmd->n_ssids) {
459					ret = -EINVAL;
460					goto out_free;
461				}
462			}
463		}
464	}
465
466	ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
467			      sizeof(*cmd), 0);
468	if (ret < 0) {
469		wl1271_error("cmd sched scan ssid list failed");
470		goto out_free;
471	}
472
473out_free:
474	kfree(cmd);
475out:
476	if (ret < 0)
477		return ret;
478	return type;
479}
480EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_ssid_list);
481
482void wlcore_scan_sched_scan_results(struct wl1271 *wl)
483{
484	wl1271_debug(DEBUG_SCAN, "got periodic scan results");
485
486	ieee80211_sched_scan_results(wl->hw);
487}
488EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_results);
489