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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 wl12xx_queue_recovery_work(wl);
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
324int wl1271_scan_stop(struct wl1271 *wl)
325{
326 struct wl1271_cmd_header *cmd = NULL;
327 int ret = 0;
328
329 if (WARN_ON(wl->scan.state == WL1271_SCAN_STATE_IDLE))
330 return -EINVAL;
331
332 wl1271_debug(DEBUG_CMD, "cmd scan stop");
333
334 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
335 if (!cmd) {
336 ret = -ENOMEM;
337 goto out;
338 }
339
340 ret = wl1271_cmd_send(wl, CMD_STOP_SCAN, cmd,
341 sizeof(*cmd), 0);
342 if (ret < 0) {
343 wl1271_error("cmd stop_scan failed");
344 goto out;
345 }
346out:
347 kfree(cmd);
348 return ret;
349}
350
351static int
352wl1271_scan_get_sched_scan_channels(struct wl1271 *wl,
353 struct cfg80211_sched_scan_request *req,
354 struct conn_scan_ch_params *channels,
355 u32 band, bool radar, bool passive,
356 int start, int max_channels)
357{
358 struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
359 int i, j;
360 u32 flags;
361 bool force_passive = !req->n_ssids;
362
363 for (i = 0, j = start;
364 i < req->n_channels && j < max_channels;
365 i++) {
366 flags = req->channels[i]->flags;
367
368 if (force_passive)
369 flags |= IEEE80211_CHAN_PASSIVE_SCAN;
370
371 if ((req->channels[i]->band == band) &&
372 !(flags & IEEE80211_CHAN_DISABLED) &&
373 (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
374 /* if radar is set, we ignore the passive flag */
375 (radar ||
376 !!(flags & IEEE80211_CHAN_PASSIVE_SCAN) == passive)) {
377 wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
378 req->channels[i]->band,
379 req->channels[i]->center_freq);
380 wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
381 req->channels[i]->hw_value,
382 req->channels[i]->flags);
383 wl1271_debug(DEBUG_SCAN, "max_power %d",
384 req->channels[i]->max_power);
385
386 if (flags & IEEE80211_CHAN_RADAR) {
387 channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
388 channels[j].passive_duration =
389 cpu_to_le16(c->dwell_time_dfs);
390 }
391 else if (flags & IEEE80211_CHAN_PASSIVE_SCAN) {
392 channels[j].passive_duration =
393 cpu_to_le16(c->dwell_time_passive);
394 } else {
395 channels[j].min_duration =
396 cpu_to_le16(c->min_dwell_time_active);
397 channels[j].max_duration =
398 cpu_to_le16(c->max_dwell_time_active);
399 }
400 channels[j].tx_power_att = req->channels[i]->max_power;
401 channels[j].channel = req->channels[i]->hw_value;
402
403 j++;
404 }
405 }
406
407 return j - start;
408}
409
410static bool
411wl1271_scan_sched_scan_channels(struct wl1271 *wl,
412 struct cfg80211_sched_scan_request *req,
413 struct wl1271_cmd_sched_scan_config *cfg)
414{
415 cfg->passive[0] =
416 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_2,
417 IEEE80211_BAND_2GHZ,
418 false, true, 0,
419 MAX_CHANNELS_2GHZ);
420 cfg->active[0] =
421 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_2,
422 IEEE80211_BAND_2GHZ,
423 false, false,
424 cfg->passive[0],
425 MAX_CHANNELS_2GHZ);
426 cfg->passive[1] =
427 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_5,
428 IEEE80211_BAND_5GHZ,
429 false, true, 0,
430 MAX_CHANNELS_5GHZ);
431 cfg->dfs =
432 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_5,
433 IEEE80211_BAND_5GHZ,
434 true, true,
435 cfg->passive[1],
436 MAX_CHANNELS_5GHZ);
437 cfg->active[1] =
438 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_5,
439 IEEE80211_BAND_5GHZ,
440 false, false,
441 cfg->passive[1] + cfg->dfs,
442 MAX_CHANNELS_5GHZ);
443 /* 802.11j channels are not supported yet */
444 cfg->passive[2] = 0;
445 cfg->active[2] = 0;
446
447 wl1271_debug(DEBUG_SCAN, " 2.4GHz: active %d passive %d",
448 cfg->active[0], cfg->passive[0]);
449 wl1271_debug(DEBUG_SCAN, " 5GHz: active %d passive %d",
450 cfg->active[1], cfg->passive[1]);
451 wl1271_debug(DEBUG_SCAN, " DFS: %d", cfg->dfs);
452
453 return cfg->passive[0] || cfg->active[0] ||
454 cfg->passive[1] || cfg->active[1] || cfg->dfs ||
455 cfg->passive[2] || cfg->active[2];
456}
457
458int wl1271_scan_sched_scan_config(struct wl1271 *wl,
459 struct cfg80211_sched_scan_request *req,
460 struct ieee80211_sched_scan_ies *ies)
461{
462 struct wl1271_cmd_sched_scan_config *cfg = NULL;
463 struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
464 int i, ret;
465 bool force_passive = !req->n_ssids;
466
467 wl1271_debug(DEBUG_CMD, "cmd sched_scan scan config");
468
469 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
470 if (!cfg)
471 return -ENOMEM;
472
473 cfg->rssi_threshold = c->rssi_threshold;
474 cfg->snr_threshold = c->snr_threshold;
475 cfg->n_probe_reqs = c->num_probe_reqs;
476 /* cycles set to 0 it means infinite (until manually stopped) */
477 cfg->cycles = 0;
478 /* report APs when at least 1 is found */
479 cfg->report_after = 1;
480 /* don't stop scanning automatically when something is found */
481 cfg->terminate = 0;
482 cfg->tag = WL1271_SCAN_DEFAULT_TAG;
483 /* don't filter on BSS type */
484 cfg->bss_type = SCAN_BSS_TYPE_ANY;
485 /* currently NL80211 supports only a single interval */
486 for (i = 0; i < SCAN_MAX_CYCLE_INTERVALS; i++)
487 cfg->intervals[i] = cpu_to_le32(req->interval);
488
489 if (!force_passive && req->ssids[0].ssid_len && req->ssids[0].ssid) {
490 cfg->filter_type = SCAN_SSID_FILTER_SPECIFIC;
491 cfg->ssid_len = req->ssids[0].ssid_len;
492 memcpy(cfg->ssid, req->ssids[0].ssid,
493 req->ssids[0].ssid_len);
494 } else {
495 cfg->filter_type = SCAN_SSID_FILTER_ANY;
496 cfg->ssid_len = 0;
497 }
498
499 if (!wl1271_scan_sched_scan_channels(wl, req, cfg)) {
500 wl1271_error("scan channel list is empty");
501 ret = -EINVAL;
502 goto out;
503 }
504
505 if (!force_passive && cfg->active[0]) {
506 ret = wl1271_cmd_build_probe_req(wl, req->ssids[0].ssid,
507 req->ssids[0].ssid_len,
508 ies->ie[IEEE80211_BAND_2GHZ],
509 ies->len[IEEE80211_BAND_2GHZ],
510 IEEE80211_BAND_2GHZ);
511 if (ret < 0) {
512 wl1271_error("2.4GHz PROBE request template failed");
513 goto out;
514 }
515 }
516
517 if (!force_passive && cfg->active[1]) {
518 ret = wl1271_cmd_build_probe_req(wl, req->ssids[0].ssid,
519 req->ssids[0].ssid_len,
520 ies->ie[IEEE80211_BAND_5GHZ],
521 ies->len[IEEE80211_BAND_5GHZ],
522 IEEE80211_BAND_5GHZ);
523 if (ret < 0) {
524 wl1271_error("5GHz PROBE request template failed");
525 goto out;
526 }
527 }
528
529 wl1271_dump(DEBUG_SCAN, "SCAN_CFG: ", cfg, sizeof(*cfg));
530
531 ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_CFG, cfg,
532 sizeof(*cfg), 0);
533 if (ret < 0) {
534 wl1271_error("SCAN configuration failed");
535 goto out;
536 }
537out:
538 kfree(cfg);
539 return ret;
540}
541
542int wl1271_scan_sched_scan_start(struct wl1271 *wl)
543{
544 struct wl1271_cmd_sched_scan_start *start;
545 int ret = 0;
546
547 wl1271_debug(DEBUG_CMD, "cmd periodic scan start");
548
549 if (wl->bss_type != BSS_TYPE_STA_BSS)
550 return -EOPNOTSUPP;
551
552 if (!test_bit(WL1271_FLAG_IDLE, &wl->flags))
553 return -EBUSY;
554
555 start = kzalloc(sizeof(*start), GFP_KERNEL);
556 if (!start)
557 return -ENOMEM;
558
559 start->tag = WL1271_SCAN_DEFAULT_TAG;
560
561 ret = wl1271_cmd_send(wl, CMD_START_PERIODIC_SCAN, start,
562 sizeof(*start), 0);
563 if (ret < 0) {
564 wl1271_error("failed to send scan start command");
565 goto out_free;
566 }
567
568out_free:
569 kfree(start);
570 return ret;
571}
572
573void wl1271_scan_sched_scan_results(struct wl1271 *wl)
574{
575 wl1271_debug(DEBUG_SCAN, "got periodic scan results");
576
577 ieee80211_sched_scan_results(wl->hw);
578}
579
580void wl1271_scan_sched_scan_stop(struct wl1271 *wl)
581{
582 struct wl1271_cmd_sched_scan_stop *stop;
583 int ret = 0;
584
585 wl1271_debug(DEBUG_CMD, "cmd periodic scan stop");
586
587 /* FIXME: what to do if alloc'ing to stop fails? */
588 stop = kzalloc(sizeof(*stop), GFP_KERNEL);
589 if (!stop) {
590 wl1271_error("failed to alloc memory to send sched scan stop");
591 return;
592 }
593
594 stop->tag = WL1271_SCAN_DEFAULT_TAG;
595
596 ret = wl1271_cmd_send(wl, CMD_STOP_PERIODIC_SCAN, stop,
597 sizeof(*stop), 0);
598 if (ret < 0) {
599 wl1271_error("failed to send sched scan stop command");
600 goto out_free;
601 }
602 wl->sched_scanning = false;
603
604out_free:
605 kfree(stop);
606}