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path: root/drivers/net/wireless/wl12xx/scan.c
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-rw-r--r--drivers/net/wireless/wl12xx/scan.c582
1 files changed, 582 insertions, 0 deletions
diff --git a/drivers/net/wireless/wl12xx/scan.c b/drivers/net/wireless/wl12xx/scan.c
new file mode 100644
index 000000000000..56f76abc754d
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/scan.c
@@ -0,0 +1,582 @@
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 "wl12xx.h"
27#include "cmd.h"
28#include "scan.h"
29#include "acx.h"
30#include "ps.h"
31
32void wl1271_scan_complete_work(struct work_struct *work)
33{
34 struct delayed_work *dwork;
35 struct wl1271 *wl;
36
37 dwork = container_of(work, struct delayed_work, work);
38 wl = container_of(dwork, struct wl1271, scan_complete_work);
39
40 wl1271_debug(DEBUG_SCAN, "Scanning complete");
41
42 mutex_lock(&wl->mutex);
43
44 if (wl->state == WL1271_STATE_OFF)
45 goto out;
46
47 if (wl->scan.state == WL1271_SCAN_STATE_IDLE)
48 goto out;
49
50 wl->scan.state = WL1271_SCAN_STATE_IDLE;
51 memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
52 wl->scan.req = NULL;
53 ieee80211_scan_completed(wl->hw, false);
54
55 /* restore hardware connection monitoring template */
56 if (test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags)) {
57 if (wl1271_ps_elp_wakeup(wl) == 0) {
58 wl1271_cmd_build_ap_probe_req(wl, wl->probereq);
59 wl1271_ps_elp_sleep(wl);
60 }
61 }
62
63 if (wl->scan.failed) {
64 wl1271_info("Scan completed due to error.");
65 ieee80211_queue_work(wl->hw, &wl->recovery_work);
66 }
67
68out:
69 mutex_unlock(&wl->mutex);
70
71}
72
73
74static int wl1271_get_scan_channels(struct wl1271 *wl,
75 struct cfg80211_scan_request *req,
76 struct basic_scan_channel_params *channels,
77 enum ieee80211_band band, bool passive)
78{
79 struct conf_scan_settings *c = &wl->conf.scan;
80 int i, j;
81 u32 flags;
82
83 for (i = 0, j = 0;
84 i < req->n_channels && j < WL1271_SCAN_MAX_CHANNELS;
85 i++) {
86
87 flags = req->channels[i]->flags;
88
89 if (!test_bit(i, wl->scan.scanned_ch) &&
90 !(flags & IEEE80211_CHAN_DISABLED) &&
91 ((!!(flags & IEEE80211_CHAN_PASSIVE_SCAN)) == passive) &&
92 (req->channels[i]->band == band)) {
93
94 wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
95 req->channels[i]->band,
96 req->channels[i]->center_freq);
97 wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
98 req->channels[i]->hw_value,
99 req->channels[i]->flags);
100 wl1271_debug(DEBUG_SCAN,
101 "max_antenna_gain %d, max_power %d",
102 req->channels[i]->max_antenna_gain,
103 req->channels[i]->max_power);
104 wl1271_debug(DEBUG_SCAN, "beacon_found %d",
105 req->channels[i]->beacon_found);
106
107 if (!passive) {
108 channels[j].min_duration =
109 cpu_to_le32(c->min_dwell_time_active);
110 channels[j].max_duration =
111 cpu_to_le32(c->max_dwell_time_active);
112 } else {
113 channels[j].min_duration =
114 cpu_to_le32(c->min_dwell_time_passive);
115 channels[j].max_duration =
116 cpu_to_le32(c->max_dwell_time_passive);
117 }
118 channels[j].early_termination = 0;
119 channels[j].tx_power_att = req->channels[i]->max_power;
120 channels[j].channel = req->channels[i]->hw_value;
121
122 memset(&channels[j].bssid_lsb, 0xff, 4);
123 memset(&channels[j].bssid_msb, 0xff, 2);
124
125 /* Mark the channels we already used */
126 set_bit(i, wl->scan.scanned_ch);
127
128 j++;
129 }
130 }
131
132 return j;
133}
134
135#define WL1271_NOTHING_TO_SCAN 1
136
137static int wl1271_scan_send(struct wl1271 *wl, enum ieee80211_band band,
138 bool passive, u32 basic_rate)
139{
140 struct wl1271_cmd_scan *cmd;
141 struct wl1271_cmd_trigger_scan_to *trigger;
142 int ret;
143 u16 scan_options = 0;
144
145 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
146 trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
147 if (!cmd || !trigger) {
148 ret = -ENOMEM;
149 goto out;
150 }
151
152 /* We always use high priority scans */
153 scan_options = WL1271_SCAN_OPT_PRIORITY_HIGH;
154
155 /* No SSIDs means that we have a forced passive scan */
156 if (passive || wl->scan.req->n_ssids == 0)
157 scan_options |= WL1271_SCAN_OPT_PASSIVE;
158
159 cmd->params.scan_options = cpu_to_le16(scan_options);
160
161 cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req,
162 cmd->channels,
163 band, passive);
164 if (cmd->params.n_ch == 0) {
165 ret = WL1271_NOTHING_TO_SCAN;
166 goto out;
167 }
168
169 cmd->params.tx_rate = cpu_to_le32(basic_rate);
170 cmd->params.rx_config_options = cpu_to_le32(CFG_RX_ALL_GOOD);
171 cmd->params.rx_filter_options =
172 cpu_to_le32(CFG_RX_PRSP_EN | CFG_RX_MGMT_EN | CFG_RX_BCN_EN);
173
174 cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs;
175 cmd->params.tx_rate = cpu_to_le32(basic_rate);
176 cmd->params.tid_trigger = 0;
177 cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;
178
179 if (band == IEEE80211_BAND_2GHZ)
180 cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ;
181 else
182 cmd->params.band = WL1271_SCAN_BAND_5_GHZ;
183
184 if (wl->scan.ssid_len && wl->scan.ssid) {
185 cmd->params.ssid_len = wl->scan.ssid_len;
186 memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len);
187 }
188
189 ret = wl1271_cmd_build_probe_req(wl, wl->scan.ssid, wl->scan.ssid_len,
190 wl->scan.req->ie, wl->scan.req->ie_len,
191 band);
192 if (ret < 0) {
193 wl1271_error("PROBE request template failed");
194 goto out;
195 }
196
197 /* disable the timeout */
198 trigger->timeout = 0;
199 ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
200 sizeof(*trigger), 0);
201 if (ret < 0) {
202 wl1271_error("trigger scan to failed for hw scan");
203 goto out;
204 }
205
206 wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));
207
208 ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
209 if (ret < 0) {
210 wl1271_error("SCAN failed");
211 goto out;
212 }
213
214out:
215 kfree(cmd);
216 kfree(trigger);
217 return ret;
218}
219
220void wl1271_scan_stm(struct wl1271 *wl)
221{
222 int ret = 0;
223
224 switch (wl->scan.state) {
225 case WL1271_SCAN_STATE_IDLE:
226 break;
227
228 case WL1271_SCAN_STATE_2GHZ_ACTIVE:
229 ret = wl1271_scan_send(wl, IEEE80211_BAND_2GHZ, false,
230 wl->conf.tx.basic_rate);
231 if (ret == WL1271_NOTHING_TO_SCAN) {
232 wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE;
233 wl1271_scan_stm(wl);
234 }
235
236 break;
237
238 case WL1271_SCAN_STATE_2GHZ_PASSIVE:
239 ret = wl1271_scan_send(wl, IEEE80211_BAND_2GHZ, true,
240 wl->conf.tx.basic_rate);
241 if (ret == WL1271_NOTHING_TO_SCAN) {
242 if (wl->enable_11a)
243 wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE;
244 else
245 wl->scan.state = WL1271_SCAN_STATE_DONE;
246 wl1271_scan_stm(wl);
247 }
248
249 break;
250
251 case WL1271_SCAN_STATE_5GHZ_ACTIVE:
252 ret = wl1271_scan_send(wl, IEEE80211_BAND_5GHZ, false,
253 wl->conf.tx.basic_rate_5);
254 if (ret == WL1271_NOTHING_TO_SCAN) {
255 wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE;
256 wl1271_scan_stm(wl);
257 }
258
259 break;
260
261 case WL1271_SCAN_STATE_5GHZ_PASSIVE:
262 ret = wl1271_scan_send(wl, IEEE80211_BAND_5GHZ, true,
263 wl->conf.tx.basic_rate_5);
264 if (ret == WL1271_NOTHING_TO_SCAN) {
265 wl->scan.state = WL1271_SCAN_STATE_DONE;
266 wl1271_scan_stm(wl);
267 }
268
269 break;
270
271 case WL1271_SCAN_STATE_DONE:
272 wl->scan.failed = false;
273 cancel_delayed_work(&wl->scan_complete_work);
274 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
275 msecs_to_jiffies(0));
276 break;
277
278 default:
279 wl1271_error("invalid scan state");
280 break;
281 }
282
283 if (ret < 0) {
284 cancel_delayed_work(&wl->scan_complete_work);
285 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
286 msecs_to_jiffies(0));
287 }
288}
289
290int wl1271_scan(struct wl1271 *wl, const u8 *ssid, size_t ssid_len,
291 struct cfg80211_scan_request *req)
292{
293 /*
294 * cfg80211 should guarantee that we don't get more channels
295 * than what we have registered.
296 */
297 BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
298
299 if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
300 return -EBUSY;
301
302 wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
303
304 if (ssid_len && ssid) {
305 wl->scan.ssid_len = ssid_len;
306 memcpy(wl->scan.ssid, ssid, ssid_len);
307 } else {
308 wl->scan.ssid_len = 0;
309 }
310
311 wl->scan.req = req;
312 memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
313
314 /* we assume failure so that timeout scenarios are handled correctly */
315 wl->scan.failed = true;
316 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
317 msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
318
319 wl1271_scan_stm(wl);
320
321 return 0;
322}
323
324static int
325wl1271_scan_get_sched_scan_channels(struct wl1271 *wl,
326 struct cfg80211_sched_scan_request *req,
327 struct conn_scan_ch_params *channels,
328 u32 band, bool radar, bool passive,
329 int start)
330{
331 struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
332 int i, j;
333 u32 flags;
334 bool force_passive = !req->n_ssids;
335
336 for (i = 0, j = start;
337 i < req->n_channels && j < MAX_CHANNELS_ALL_BANDS;
338 i++) {
339 flags = req->channels[i]->flags;
340
341 if (force_passive)
342 flags |= IEEE80211_CHAN_PASSIVE_SCAN;
343
344 if ((req->channels[i]->band == band) &&
345 !(flags & IEEE80211_CHAN_DISABLED) &&
346 (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
347 /* if radar is set, we ignore the passive flag */
348 (radar ||
349 !!(flags & IEEE80211_CHAN_PASSIVE_SCAN) == passive)) {
350 wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
351 req->channels[i]->band,
352 req->channels[i]->center_freq);
353 wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
354 req->channels[i]->hw_value,
355 req->channels[i]->flags);
356 wl1271_debug(DEBUG_SCAN, "max_power %d",
357 req->channels[i]->max_power);
358
359 if (flags & IEEE80211_CHAN_RADAR) {
360 channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
361 channels[j].passive_duration =
362 cpu_to_le16(c->dwell_time_dfs);
363 }
364 else if (flags & IEEE80211_CHAN_PASSIVE_SCAN) {
365 channels[j].passive_duration =
366 cpu_to_le16(c->dwell_time_passive);
367 } else {
368 channels[j].min_duration =
369 cpu_to_le16(c->min_dwell_time_active);
370 channels[j].max_duration =
371 cpu_to_le16(c->max_dwell_time_active);
372 }
373 channels[j].tx_power_att = req->channels[i]->max_power;
374 channels[j].channel = req->channels[i]->hw_value;
375
376 j++;
377 }
378 }
379
380 return j - start;
381}
382
383static int
384wl1271_scan_sched_scan_channels(struct wl1271 *wl,
385 struct cfg80211_sched_scan_request *req,
386 struct wl1271_cmd_sched_scan_config *cfg)
387{
388 int idx = 0;
389
390 cfg->passive[0] =
391 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels,
392 IEEE80211_BAND_2GHZ,
393 false, true, idx);
394 idx += cfg->passive[0];
395
396 cfg->active[0] =
397 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels,
398 IEEE80211_BAND_2GHZ,
399 false, false, idx);
400 /*
401 * 5GHz channels always start at position 14, not immediately
402 * after the last 2.4GHz channel
403 */
404 idx = 14;
405
406 cfg->passive[1] =
407 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels,
408 IEEE80211_BAND_5GHZ,
409 false, true, idx);
410 idx += cfg->passive[1];
411
412 cfg->dfs =
413 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels,
414 IEEE80211_BAND_5GHZ,
415 true, true, idx);
416 idx += cfg->dfs;
417
418 cfg->active[1] =
419 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels,
420 IEEE80211_BAND_5GHZ,
421 false, false, idx);
422 idx += cfg->active[1];
423
424 wl1271_debug(DEBUG_SCAN, " 2.4GHz: active %d passive %d",
425 cfg->active[0], cfg->passive[0]);
426 wl1271_debug(DEBUG_SCAN, " 5GHz: active %d passive %d",
427 cfg->active[1], cfg->passive[1]);
428 wl1271_debug(DEBUG_SCAN, " DFS: %d", cfg->dfs);
429
430 return idx;
431}
432
433int wl1271_scan_sched_scan_config(struct wl1271 *wl,
434 struct cfg80211_sched_scan_request *req,
435 struct ieee80211_sched_scan_ies *ies)
436{
437 struct wl1271_cmd_sched_scan_config *cfg = NULL;
438 struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
439 int i, total_channels, ret;
440 bool force_passive = !req->n_ssids;
441
442 wl1271_debug(DEBUG_CMD, "cmd sched_scan scan config");
443
444 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
445 if (!cfg)
446 return -ENOMEM;
447
448 cfg->rssi_threshold = c->rssi_threshold;
449 cfg->snr_threshold = c->snr_threshold;
450 cfg->n_probe_reqs = c->num_probe_reqs;
451 /* cycles set to 0 it means infinite (until manually stopped) */
452 cfg->cycles = 0;
453 /* report APs when at least 1 is found */
454 cfg->report_after = 1;
455 /* don't stop scanning automatically when something is found */
456 cfg->terminate = 0;
457 cfg->tag = WL1271_SCAN_DEFAULT_TAG;
458 /* don't filter on BSS type */
459 cfg->bss_type = SCAN_BSS_TYPE_ANY;
460 /* currently NL80211 supports only a single interval */
461 for (i = 0; i < SCAN_MAX_CYCLE_INTERVALS; i++)
462 cfg->intervals[i] = cpu_to_le32(req->interval);
463
464 if (!force_passive && req->ssids[0].ssid_len && req->ssids[0].ssid) {
465 cfg->filter_type = SCAN_SSID_FILTER_SPECIFIC;
466 cfg->ssid_len = req->ssids[0].ssid_len;
467 memcpy(cfg->ssid, req->ssids[0].ssid,
468 req->ssids[0].ssid_len);
469 } else {
470 cfg->filter_type = SCAN_SSID_FILTER_ANY;
471 cfg->ssid_len = 0;
472 }
473
474 total_channels = wl1271_scan_sched_scan_channels(wl, req, cfg);
475 if (total_channels == 0) {
476 wl1271_error("scan channel list is empty");
477 ret = -EINVAL;
478 goto out;
479 }
480
481 if (!force_passive && cfg->active[0]) {
482 ret = wl1271_cmd_build_probe_req(wl, req->ssids[0].ssid,
483 req->ssids[0].ssid_len,
484 ies->ie[IEEE80211_BAND_2GHZ],
485 ies->len[IEEE80211_BAND_2GHZ],
486 IEEE80211_BAND_2GHZ);
487 if (ret < 0) {
488 wl1271_error("2.4GHz PROBE request template failed");
489 goto out;
490 }
491 }
492
493 if (!force_passive && cfg->active[1]) {
494 ret = wl1271_cmd_build_probe_req(wl, req->ssids[0].ssid,
495 req->ssids[0].ssid_len,
496 ies->ie[IEEE80211_BAND_5GHZ],
497 ies->len[IEEE80211_BAND_5GHZ],
498 IEEE80211_BAND_5GHZ);
499 if (ret < 0) {
500 wl1271_error("5GHz PROBE request template failed");
501 goto out;
502 }
503 }
504
505 wl1271_dump(DEBUG_SCAN, "SCAN_CFG: ", cfg, sizeof(*cfg));
506
507 ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_CFG, cfg,
508 sizeof(*cfg), 0);
509 if (ret < 0) {
510 wl1271_error("SCAN configuration failed");
511 goto out;
512 }
513out:
514 kfree(cfg);
515 return ret;
516}
517
518int wl1271_scan_sched_scan_start(struct wl1271 *wl)
519{
520 struct wl1271_cmd_sched_scan_start *start;
521 int ret = 0;
522
523 wl1271_debug(DEBUG_CMD, "cmd periodic scan start");
524
525 if (wl->bss_type != BSS_TYPE_STA_BSS)
526 return -EOPNOTSUPP;
527
528 if (!test_bit(WL1271_FLAG_IDLE, &wl->flags))
529 return -EBUSY;
530
531 start = kzalloc(sizeof(*start), GFP_KERNEL);
532 if (!start)
533 return -ENOMEM;
534
535 start->tag = WL1271_SCAN_DEFAULT_TAG;
536
537 ret = wl1271_cmd_send(wl, CMD_START_PERIODIC_SCAN, start,
538 sizeof(*start), 0);
539 if (ret < 0) {
540 wl1271_error("failed to send scan start command");
541 goto out_free;
542 }
543
544out_free:
545 kfree(start);
546 return ret;
547}
548
549void wl1271_scan_sched_scan_results(struct wl1271 *wl)
550{
551 wl1271_debug(DEBUG_SCAN, "got periodic scan results");
552
553 ieee80211_sched_scan_results(wl->hw);
554}
555
556void wl1271_scan_sched_scan_stop(struct wl1271 *wl)
557{
558 struct wl1271_cmd_sched_scan_stop *stop;
559 int ret = 0;
560
561 wl1271_debug(DEBUG_CMD, "cmd periodic scan stop");
562
563 /* FIXME: what to do if alloc'ing to stop fails? */
564 stop = kzalloc(sizeof(*stop), GFP_KERNEL);
565 if (!stop) {
566 wl1271_error("failed to alloc memory to send sched scan stop");
567 return;
568 }
569
570 stop->tag = WL1271_SCAN_DEFAULT_TAG;
571
572 ret = wl1271_cmd_send(wl, CMD_STOP_PERIODIC_SCAN, stop,
573 sizeof(*stop), 0);
574 if (ret < 0) {
575 wl1271_error("failed to send sched scan stop command");
576 goto out_free;
577 }
578 wl->sched_scanning = false;
579
580out_free:
581 kfree(stop);
582}
generated by cgit v1.2.2 (git 2.25.0) at 2025-04-09 12:32:35 -0400