blob: 6f897b9d90caf21784342d700bba64a98b40dc09 [file] [log] [blame]
Luciano Coelho34dd2aa2010-07-08 17:50:06 +03001/*
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
Shahar Levi00d20102010-11-08 11:20:10 +000026#include "wl12xx.h"
27#include "cmd.h"
28#include "scan.h"
29#include "acx.h"
Luciano Coelho34dd2aa2010-07-08 17:50:06 +030030
Juuso Oikarinenc454f1d2010-08-24 06:28:03 +030031void wl1271_scan_complete_work(struct work_struct *work)
32{
Juuso Oikarinen78abd322010-09-21 06:23:32 +020033 struct delayed_work *dwork;
34 struct wl1271 *wl;
35
36 dwork = container_of(work, struct delayed_work, work);
37 wl = container_of(dwork, struct wl1271, scan_complete_work);
Juuso Oikarinenc454f1d2010-08-24 06:28:03 +030038
39 wl1271_debug(DEBUG_SCAN, "Scanning complete");
40
41 mutex_lock(&wl->mutex);
Juuso Oikarinen52a2a372010-09-21 06:23:30 +020042
43 if (wl->scan.state == WL1271_SCAN_STATE_IDLE) {
44 mutex_unlock(&wl->mutex);
45 return;
46 }
47
Juuso Oikarinenc454f1d2010-08-24 06:28:03 +030048 wl->scan.state = WL1271_SCAN_STATE_IDLE;
49 kfree(wl->scan.scanned_ch);
50 wl->scan.scanned_ch = NULL;
Juuso Oikarinenb739a422010-10-26 13:24:38 +020051 wl->scan.req = NULL;
Juuso Oikarinenc454f1d2010-08-24 06:28:03 +030052 ieee80211_scan_completed(wl->hw, false);
Juuso Oikarinen78abd322010-09-21 06:23:32 +020053
Juuso Oikarinen2f6724b2010-11-24 08:16:57 +020054 /* restore hardware connection monitoring template */
55 if (test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags))
56 wl1271_cmd_build_ap_probe_req(wl, wl->probereq);
57
Juuso Oikarinen78abd322010-09-21 06:23:32 +020058 if (wl->scan.failed) {
59 wl1271_info("Scan completed due to error.");
60 ieee80211_queue_work(wl->hw, &wl->recovery_work);
61 }
Juuso Oikarinenb739a422010-10-26 13:24:38 +020062 mutex_unlock(&wl->mutex);
63
Juuso Oikarinenc454f1d2010-08-24 06:28:03 +030064}
65
66
Luciano Coelho08688d62010-07-08 17:50:07 +030067static int wl1271_get_scan_channels(struct wl1271 *wl,
68 struct cfg80211_scan_request *req,
69 struct basic_scan_channel_params *channels,
70 enum ieee80211_band band, bool passive)
Luciano Coelho34dd2aa2010-07-08 17:50:06 +030071{
Juuso Oikarinenbea39d62010-09-21 08:14:31 +020072 struct conf_scan_settings *c = &wl->conf.scan;
Luciano Coelho08688d62010-07-08 17:50:07 +030073 int i, j;
74 u32 flags;
Luciano Coelho34dd2aa2010-07-08 17:50:06 +030075
Luciano Coelho08688d62010-07-08 17:50:07 +030076 for (i = 0, j = 0;
77 i < req->n_channels && j < WL1271_SCAN_MAX_CHANNELS;
78 i++) {
Luciano Coelho34dd2aa2010-07-08 17:50:06 +030079
Luciano Coelho08688d62010-07-08 17:50:07 +030080 flags = req->channels[i]->flags;
Luciano Coelho34dd2aa2010-07-08 17:50:06 +030081
Luciano Coelho08688d62010-07-08 17:50:07 +030082 if (!wl->scan.scanned_ch[i] &&
83 !(flags & IEEE80211_CHAN_DISABLED) &&
84 ((!!(flags & IEEE80211_CHAN_PASSIVE_SCAN)) == passive) &&
85 (req->channels[i]->band == band)) {
Luciano Coelho34dd2aa2010-07-08 17:50:06 +030086
Luciano Coelho08688d62010-07-08 17:50:07 +030087 wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
88 req->channels[i]->band,
89 req->channels[i]->center_freq);
90 wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
91 req->channels[i]->hw_value,
92 req->channels[i]->flags);
93 wl1271_debug(DEBUG_SCAN,
94 "max_antenna_gain %d, max_power %d",
95 req->channels[i]->max_antenna_gain,
96 req->channels[i]->max_power);
97 wl1271_debug(DEBUG_SCAN, "beacon_found %d",
98 req->channels[i]->beacon_found);
Luciano Coelho34dd2aa2010-07-08 17:50:06 +030099
Juuso Oikarinenbea39d62010-09-21 08:14:31 +0200100 if (!passive) {
101 channels[j].min_duration =
102 cpu_to_le32(c->min_dwell_time_active);
103 channels[j].max_duration =
104 cpu_to_le32(c->max_dwell_time_active);
105 } else {
106 channels[j].min_duration =
107 cpu_to_le32(c->min_dwell_time_passive);
108 channels[j].max_duration =
109 cpu_to_le32(c->max_dwell_time_passive);
110 }
Luciano Coelho08688d62010-07-08 17:50:07 +0300111 channels[j].early_termination = 0;
Luciano Coelho3cc7b542010-07-08 17:50:08 +0300112 channels[j].tx_power_att = req->channels[i]->max_power;
Luciano Coelho08688d62010-07-08 17:50:07 +0300113 channels[j].channel = req->channels[i]->hw_value;
114
115 memset(&channels[j].bssid_lsb, 0xff, 4);
116 memset(&channels[j].bssid_msb, 0xff, 2);
117
118 /* Mark the channels we already used */
119 wl->scan.scanned_ch[i] = true;
120
Luciano Coelho34dd2aa2010-07-08 17:50:06 +0300121 j++;
122 }
123 }
124
Luciano Coelho08688d62010-07-08 17:50:07 +0300125 return j;
126}
Luciano Coelho34dd2aa2010-07-08 17:50:06 +0300127
Luciano Coelho08688d62010-07-08 17:50:07 +0300128#define WL1271_NOTHING_TO_SCAN 1
129
130static int wl1271_scan_send(struct wl1271 *wl, enum ieee80211_band band,
131 bool passive, u32 basic_rate)
132{
133 struct wl1271_cmd_scan *cmd;
134 struct wl1271_cmd_trigger_scan_to *trigger;
135 int ret;
136 u16 scan_options = 0;
137
138 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
139 trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
140 if (!cmd || !trigger) {
141 ret = -ENOMEM;
142 goto out;
Luciano Coelho34dd2aa2010-07-08 17:50:06 +0300143 }
144
Luciano Coelho08688d62010-07-08 17:50:07 +0300145 /* We always use high priority scans */
146 scan_options = WL1271_SCAN_OPT_PRIORITY_HIGH;
Luciano Coelho4f35c022010-08-04 04:36:32 +0300147
148 /* No SSIDs means that we have a forced passive scan */
149 if (passive || wl->scan.req->n_ssids == 0)
Luciano Coelho08688d62010-07-08 17:50:07 +0300150 scan_options |= WL1271_SCAN_OPT_PASSIVE;
Luciano Coelho4f35c022010-08-04 04:36:32 +0300151
Luciano Coelho08688d62010-07-08 17:50:07 +0300152 cmd->params.scan_options = cpu_to_le16(scan_options);
153
154 cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req,
155 cmd->channels,
156 band, passive);
157 if (cmd->params.n_ch == 0) {
158 ret = WL1271_NOTHING_TO_SCAN;
159 goto out;
160 }
161
162 cmd->params.tx_rate = cpu_to_le32(basic_rate);
163 cmd->params.rx_config_options = cpu_to_le32(CFG_RX_ALL_GOOD);
164 cmd->params.rx_filter_options =
165 cpu_to_le32(CFG_RX_PRSP_EN | CFG_RX_MGMT_EN | CFG_RX_BCN_EN);
166
Juuso Oikarinenbea39d62010-09-21 08:14:31 +0200167 cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs;
Luciano Coelho08688d62010-07-08 17:50:07 +0300168 cmd->params.tx_rate = cpu_to_le32(basic_rate);
169 cmd->params.tid_trigger = 0;
170 cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;
171
172 if (band == IEEE80211_BAND_2GHZ)
173 cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ;
174 else
175 cmd->params.band = WL1271_SCAN_BAND_5_GHZ;
176
177 if (wl->scan.ssid_len && wl->scan.ssid) {
178 cmd->params.ssid_len = wl->scan.ssid_len;
179 memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len);
180 }
181
182 ret = wl1271_cmd_build_probe_req(wl, wl->scan.ssid, wl->scan.ssid_len,
183 wl->scan.req->ie, wl->scan.req->ie_len,
184 band);
Luciano Coelho34dd2aa2010-07-08 17:50:06 +0300185 if (ret < 0) {
186 wl1271_error("PROBE request template failed");
187 goto out;
188 }
189
Luciano Coelho34dd2aa2010-07-08 17:50:06 +0300190 /* disable the timeout */
191 trigger->timeout = 0;
Luciano Coelho34dd2aa2010-07-08 17:50:06 +0300192 ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
193 sizeof(*trigger), 0);
194 if (ret < 0) {
195 wl1271_error("trigger scan to failed for hw scan");
196 goto out;
197 }
198
Luciano Coelho08688d62010-07-08 17:50:07 +0300199 wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));
Luciano Coelho34dd2aa2010-07-08 17:50:06 +0300200
Luciano Coelho08688d62010-07-08 17:50:07 +0300201 ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
Luciano Coelho34dd2aa2010-07-08 17:50:06 +0300202 if (ret < 0) {
203 wl1271_error("SCAN failed");
Luciano Coelho34dd2aa2010-07-08 17:50:06 +0300204 goto out;
205 }
206
207out:
Luciano Coelho08688d62010-07-08 17:50:07 +0300208 kfree(cmd);
Luciano Coelho34dd2aa2010-07-08 17:50:06 +0300209 kfree(trigger);
210 return ret;
211}
212
Luciano Coelho08688d62010-07-08 17:50:07 +0300213void wl1271_scan_stm(struct wl1271 *wl)
Luciano Coelho34dd2aa2010-07-08 17:50:06 +0300214{
Juuso Oikarinen78abd322010-09-21 06:23:32 +0200215 int ret = 0;
Luciano Coelho08688d62010-07-08 17:50:07 +0300216
217 switch (wl->scan.state) {
218 case WL1271_SCAN_STATE_IDLE:
219 break;
220
221 case WL1271_SCAN_STATE_2GHZ_ACTIVE:
222 ret = wl1271_scan_send(wl, IEEE80211_BAND_2GHZ, false,
223 wl->conf.tx.basic_rate);
224 if (ret == WL1271_NOTHING_TO_SCAN) {
225 wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE;
226 wl1271_scan_stm(wl);
Luciano Coelho34dd2aa2010-07-08 17:50:06 +0300227 }
Luciano Coelho08688d62010-07-08 17:50:07 +0300228
229 break;
230
231 case WL1271_SCAN_STATE_2GHZ_PASSIVE:
232 ret = wl1271_scan_send(wl, IEEE80211_BAND_2GHZ, true,
233 wl->conf.tx.basic_rate);
234 if (ret == WL1271_NOTHING_TO_SCAN) {
Juuso Oikarinen02fabb02010-08-19 04:41:15 +0200235 if (wl->enable_11a)
Luciano Coelho08688d62010-07-08 17:50:07 +0300236 wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE;
237 else
238 wl->scan.state = WL1271_SCAN_STATE_DONE;
239 wl1271_scan_stm(wl);
240 }
241
242 break;
243
244 case WL1271_SCAN_STATE_5GHZ_ACTIVE:
245 ret = wl1271_scan_send(wl, IEEE80211_BAND_5GHZ, false,
246 wl->conf.tx.basic_rate_5);
247 if (ret == WL1271_NOTHING_TO_SCAN) {
248 wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE;
249 wl1271_scan_stm(wl);
250 }
251
252 break;
253
254 case WL1271_SCAN_STATE_5GHZ_PASSIVE:
255 ret = wl1271_scan_send(wl, IEEE80211_BAND_5GHZ, true,
256 wl->conf.tx.basic_rate_5);
257 if (ret == WL1271_NOTHING_TO_SCAN) {
258 wl->scan.state = WL1271_SCAN_STATE_DONE;
259 wl1271_scan_stm(wl);
260 }
261
262 break;
263
264 case WL1271_SCAN_STATE_DONE:
Juuso Oikarinen78abd322010-09-21 06:23:32 +0200265 wl->scan.failed = false;
266 cancel_delayed_work(&wl->scan_complete_work);
267 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
268 msecs_to_jiffies(0));
Luciano Coelho08688d62010-07-08 17:50:07 +0300269 break;
270
271 default:
272 wl1271_error("invalid scan state");
273 break;
Luciano Coelho34dd2aa2010-07-08 17:50:06 +0300274 }
Juuso Oikarinen78abd322010-09-21 06:23:32 +0200275
276 if (ret < 0) {
277 cancel_delayed_work(&wl->scan_complete_work);
278 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
279 msecs_to_jiffies(0));
280 }
Luciano Coelho08688d62010-07-08 17:50:07 +0300281}
282
283int wl1271_scan(struct wl1271 *wl, const u8 *ssid, size_t ssid_len,
284 struct cfg80211_scan_request *req)
285{
286 if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
287 return -EBUSY;
288
289 wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
290
291 if (ssid_len && ssid) {
292 wl->scan.ssid_len = ssid_len;
293 memcpy(wl->scan.ssid, ssid, ssid_len);
294 } else {
295 wl->scan.ssid_len = 0;
296 }
297
298 wl->scan.req = req;
299
Joe Perchesbaeb2ff2010-08-11 07:02:48 +0000300 wl->scan.scanned_ch = kcalloc(req->n_channels,
Luciano Coelho08688d62010-07-08 17:50:07 +0300301 sizeof(*wl->scan.scanned_ch),
302 GFP_KERNEL);
Juuso Oikarinen78abd322010-09-21 06:23:32 +0200303 /* we assume failure so that timeout scenarios are handled correctly */
304 wl->scan.failed = true;
305 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
306 msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
307
Luciano Coelho08688d62010-07-08 17:50:07 +0300308 wl1271_scan_stm(wl);
309
Luciano Coelho34dd2aa2010-07-08 17:50:06 +0300310 return 0;
311}