/drivers/net/wireless/wl12xx/scan.c
C | 589 lines | 439 code | 101 blank | 49 comment | 79 complexity | 4cbc2a71be5763e737c416d5fd19af25 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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 flags = req->channels[i]->flags;
87
88 if (!test_bit(i, wl->scan.scanned_ch) &&
89 !(flags & IEEE80211_CHAN_DISABLED) &&
90 (req->channels[i]->band == band) &&
91 /*
92 * In passive scans, we scan all remaining
93 * channels, even if not marked as such.
94 * In active scans, we only scan channels not
95 * marked as passive.
96 */
97 (passive || !(flags & IEEE80211_CHAN_PASSIVE_SCAN))) {
98 wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
99 req->channels[i]->band,
100 req->channels[i]->center_freq);
101 wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
102 req->channels[i]->hw_value,
103 req->channels[i]->flags);
104 wl1271_debug(DEBUG_SCAN,
105 "max_antenna_gain %d, max_power %d",
106 req->channels[i]->max_antenna_gain,
107 req->channels[i]->max_power);
108 wl1271_debug(DEBUG_SCAN, "beacon_found %d",
109 req->channels[i]->beacon_found);
110
111 if (!passive) {
112 channels[j].min_duration =
113 cpu_to_le32(c->min_dwell_time_active);
114 channels[j].max_duration =
115 cpu_to_le32(c->max_dwell_time_active);
116 } else {
117 channels[j].min_duration =
118 cpu_to_le32(c->min_dwell_time_passive);
119 channels[j].max_duration =
120 cpu_to_le32(c->max_dwell_time_passive);
121 }
122 channels[j].early_termination = 0;
123 channels[j].tx_power_att = req->channels[i]->max_power;
124 channels[j].channel = req->channels[i]->hw_value;
125
126 memset(&channels[j].bssid_lsb, 0xff, 4);
127 memset(&channels[j].bssid_msb, 0xff, 2);
128
129 /* Mark the channels we already used */
130 set_bit(i, wl->scan.scanned_ch);
131
132 j++;
133 }
134 }
135
136 return j;
137}
138
139#define WL1271_NOTHING_TO_SCAN 1
140
141static int wl1271_scan_send(struct wl1271 *wl, enum ieee80211_band band,
142 bool passive, u32 basic_rate)
143{
144 struct wl1271_cmd_scan *cmd;
145 struct wl1271_cmd_trigger_scan_to *trigger;
146 int ret;
147 u16 scan_options = 0;
148
149 /* skip active scans if we don't have SSIDs */
150 if (!passive && wl->scan.req->n_ssids == 0)
151 return WL1271_NOTHING_TO_SCAN;
152
153 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
154 trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
155 if (!cmd || !trigger) {
156 ret = -ENOMEM;
157 goto out;
158 }
159
160 /* We always use high priority scans */
161 scan_options = WL1271_SCAN_OPT_PRIORITY_HIGH;
162
163 if (passive)
164 scan_options |= WL1271_SCAN_OPT_PASSIVE;
165
166 cmd->params.scan_options = cpu_to_le16(scan_options);
167
168 cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req,
169 cmd->channels,
170 band, passive);
171 if (cmd->params.n_ch == 0) {
172 ret = WL1271_NOTHING_TO_SCAN;
173 goto out;
174 }
175
176 cmd->params.tx_rate = cpu_to_le32(basic_rate);
177 cmd->params.rx_config_options = cpu_to_le32(CFG_RX_ALL_GOOD);
178 cmd->params.rx_filter_options =
179 cpu_to_le32(CFG_RX_PRSP_EN | CFG_RX_MGMT_EN | CFG_RX_BCN_EN);
180
181 cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs;
182 cmd->params.tx_rate = cpu_to_le32(basic_rate);
183 cmd->params.tid_trigger = 0;
184 cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;
185
186 if (band == IEEE80211_BAND_2GHZ)
187 cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ;
188 else
189 cmd->params.band = WL1271_SCAN_BAND_5_GHZ;
190
191 if (wl->scan.ssid_len && wl->scan.ssid) {
192 cmd->params.ssid_len = wl->scan.ssid_len;
193 memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len);
194 }
195
196 ret = wl1271_cmd_build_probe_req(wl, wl->scan.ssid, wl->scan.ssid_len,
197 wl->scan.req->ie, wl->scan.req->ie_len,
198 band);
199 if (ret < 0) {
200 wl1271_error("PROBE request template failed");
201 goto out;
202 }
203
204 /* disable the timeout */
205 trigger->timeout = 0;
206 ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
207 sizeof(*trigger), 0);
208 if (ret < 0) {
209 wl1271_error("trigger scan to failed for hw scan");
210 goto out;
211 }
212
213 wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));
214
215 ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
216 if (ret < 0) {
217 wl1271_error("SCAN failed");
218 goto out;
219 }
220
221out:
222 kfree(cmd);
223 kfree(trigger);
224 return ret;
225}
226
227void wl1271_scan_stm(struct wl1271 *wl)
228{
229 int ret = 0;
230
231 switch (wl->scan.state) {
232 case WL1271_SCAN_STATE_IDLE:
233 break;
234
235 case WL1271_SCAN_STATE_2GHZ_ACTIVE:
236 ret = wl1271_scan_send(wl, IEEE80211_BAND_2GHZ, false,
237 wl->conf.tx.basic_rate);
238 if (ret == WL1271_NOTHING_TO_SCAN) {
239 wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE;
240 wl1271_scan_stm(wl);
241 }
242
243 break;
244
245 case WL1271_SCAN_STATE_2GHZ_PASSIVE:
246 ret = wl1271_scan_send(wl, IEEE80211_BAND_2GHZ, true,
247 wl->conf.tx.basic_rate);
248 if (ret == WL1271_NOTHING_TO_SCAN) {
249 if (wl->enable_11a)
250 wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE;
251 else
252 wl->scan.state = WL1271_SCAN_STATE_DONE;
253 wl1271_scan_stm(wl);
254 }
255
256 break;
257
258 case WL1271_SCAN_STATE_5GHZ_ACTIVE:
259 ret = wl1271_scan_send(wl, IEEE80211_BAND_5GHZ, false,
260 wl->conf.tx.basic_rate_5);
261 if (ret == WL1271_NOTHING_TO_SCAN) {
262 wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE;
263 wl1271_scan_stm(wl);
264 }
265
266 break;
267
268 case WL1271_SCAN_STATE_5GHZ_PASSIVE:
269 ret = wl1271_scan_send(wl, IEEE80211_BAND_5GHZ, true,
270 wl->conf.tx.basic_rate_5);
271 if (ret == WL1271_NOTHING_TO_SCAN) {
272 wl->scan.state = WL1271_SCAN_STATE_DONE;
273 wl1271_scan_stm(wl);
274 }
275
276 break;
277
278 case WL1271_SCAN_STATE_DONE:
279 wl->scan.failed = false;
280 cancel_delayed_work(&wl->scan_complete_work);
281 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
282 msecs_to_jiffies(0));
283 break;
284
285 default:
286 wl1271_error("invalid scan state");
287 break;
288 }
289
290 if (ret < 0) {
291 cancel_delayed_work(&wl->scan_complete_work);
292 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
293 msecs_to_jiffies(0));
294 }
295}
296
297int wl1271_scan(struct wl1271 *wl, const u8 *ssid, size_t ssid_len,
298 struct cfg80211_scan_request *req)
299{
300 /*
301 * cfg80211 should guarantee that we don't get more channels
302 * than what we have registered.
303 */
304 BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
305
306 if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
307 return -EBUSY;
308
309 wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
310
311 if (ssid_len && ssid) {
312 wl->scan.ssid_len = ssid_len;
313 memcpy(wl->scan.ssid, ssid, ssid_len);
314 } else {
315 wl->scan.ssid_len = 0;
316 }
317
318 wl->scan.req = req;
319 memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
320
321 /* we assume failure so that timeout scenarios are handled correctly */
322 wl->scan.failed = true;
323 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
324 msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
325
326 wl1271_scan_stm(wl);
327
328 return 0;
329}
330
331static int
332wl1271_scan_get_sched_scan_channels(struct wl1271 *wl,
333 struct cfg80211_sched_scan_request *req,
334 struct conn_scan_ch_params *channels,
335 u32 band, bool radar, bool passive,
336 int start)
337{
338 struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
339 int i, j;
340 u32 flags;
341 bool force_passive = !req->n_ssids;
342
343 for (i = 0, j = start;
344 i < req->n_channels && j < MAX_CHANNELS_ALL_BANDS;
345 i++) {
346 flags = req->channels[i]->flags;
347
348 if (force_passive)
349 flags |= IEEE80211_CHAN_PASSIVE_SCAN;
350
351 if ((req->channels[i]->band == band) &&
352 !(flags & IEEE80211_CHAN_DISABLED) &&
353 (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
354 /* if radar is set, we ignore the passive flag */
355 (radar ||
356 !!(flags & IEEE80211_CHAN_PASSIVE_SCAN) == passive)) {
357 wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
358 req->channels[i]->band,
359 req->channels[i]->center_freq);
360 wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
361 req->channels[i]->hw_value,
362 req->channels[i]->flags);
363 wl1271_debug(DEBUG_SCAN, "max_power %d",
364 req->channels[i]->max_power);
365
366 if (flags & IEEE80211_CHAN_RADAR) {
367 channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
368 channels[j].passive_duration =
369 cpu_to_le16(c->dwell_time_dfs);
370 }
371 else if (flags & IEEE80211_CHAN_PASSIVE_SCAN) {
372 channels[j].passive_duration =
373 cpu_to_le16(c->dwell_time_passive);
374 } else {
375 channels[j].min_duration =
376 cpu_to_le16(c->min_dwell_time_active);
377 channels[j].max_duration =
378 cpu_to_le16(c->max_dwell_time_active);
379 }
380 channels[j].tx_power_att = req->channels[i]->max_power;
381 channels[j].channel = req->channels[i]->hw_value;
382
383 j++;
384 }
385 }
386
387 return j - start;
388}
389
390static int
391wl1271_scan_sched_scan_channels(struct wl1271 *wl,
392 struct cfg80211_sched_scan_request *req,
393 struct wl1271_cmd_sched_scan_config *cfg)
394{
395 int idx = 0;
396
397 cfg->passive[0] =
398 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels,
399 IEEE80211_BAND_2GHZ,
400 false, true, idx);
401 idx += cfg->passive[0];
402
403 cfg->active[0] =
404 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels,
405 IEEE80211_BAND_2GHZ,
406 false, false, idx);
407 /*
408 * 5GHz channels always start at position 14, not immediately
409 * after the last 2.4GHz channel
410 */
411 idx = 14;
412
413 cfg->passive[1] =
414 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels,
415 IEEE80211_BAND_5GHZ,
416 false, true, idx);
417 idx += cfg->passive[1];
418
419 cfg->dfs =
420 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels,
421 IEEE80211_BAND_5GHZ,
422 true, true, idx);
423 idx += cfg->dfs;
424
425 cfg->active[1] =
426 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels,
427 IEEE80211_BAND_5GHZ,
428 false, false, idx);
429 idx += cfg->active[1];
430
431 wl1271_debug(DEBUG_SCAN, " 2.4GHz: active %d passive %d",
432 cfg->active[0], cfg->passive[0]);
433 wl1271_debug(DEBUG_SCAN, " 5GHz: active %d passive %d",
434 cfg->active[1], cfg->passive[1]);
435 wl1271_debug(DEBUG_SCAN, " DFS: %d", cfg->dfs);
436
437 return idx;
438}
439
440int wl1271_scan_sched_scan_config(struct wl1271 *wl,
441 struct cfg80211_sched_scan_request *req,
442 struct ieee80211_sched_scan_ies *ies)
443{
444 struct wl1271_cmd_sched_scan_config *cfg = NULL;
445 struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
446 int i, total_channels, ret;
447 bool force_passive = !req->n_ssids;
448
449 wl1271_debug(DEBUG_CMD, "cmd sched_scan scan config");
450
451 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
452 if (!cfg)
453 return -ENOMEM;
454
455 cfg->rssi_threshold = c->rssi_threshold;
456 cfg->snr_threshold = c->snr_threshold;
457 cfg->n_probe_reqs = c->num_probe_reqs;
458 /* cycles set to 0 it means infinite (until manually stopped) */
459 cfg->cycles = 0;
460 /* report APs when at least 1 is found */
461 cfg->report_after = 1;
462 /* don't stop scanning automatically when something is found */
463 cfg->terminate = 0;
464 cfg->tag = WL1271_SCAN_DEFAULT_TAG;
465 /* don't filter on BSS type */
466 cfg->bss_type = SCAN_BSS_TYPE_ANY;
467 /* currently NL80211 supports only a single interval */
468 for (i = 0; i < SCAN_MAX_CYCLE_INTERVALS; i++)
469 cfg->intervals[i] = cpu_to_le32(req->interval);
470
471 if (!force_passive && req->ssids[0].ssid_len && req->ssids[0].ssid) {
472 cfg->filter_type = SCAN_SSID_FILTER_SPECIFIC;
473 cfg->ssid_len = req->ssids[0].ssid_len;
474 memcpy(cfg->ssid, req->ssids[0].ssid,
475 req->ssids[0].ssid_len);
476 } else {
477 cfg->filter_type = SCAN_SSID_FILTER_ANY;
478 cfg->ssid_len = 0;
479 }
480
481 total_channels = wl1271_scan_sched_scan_channels(wl, req, cfg);
482 if (total_channels == 0) {
483 wl1271_error("scan channel list is empty");
484 ret = -EINVAL;
485 goto out;
486 }
487
488 if (!force_passive && cfg->active[0]) {
489 ret = wl1271_cmd_build_probe_req(wl, req->ssids[0].ssid,
490 req->ssids[0].ssid_len,
491 ies->ie[IEEE80211_BAND_2GHZ],
492 ies->len[IEEE80211_BAND_2GHZ],
493 IEEE80211_BAND_2GHZ);
494 if (ret < 0) {
495 wl1271_error("2.4GHz PROBE request template failed");
496 goto out;
497 }
498 }
499
500 if (!force_passive && cfg->active[1]) {
501 ret = wl1271_cmd_build_probe_req(wl, req->ssids[0].ssid,
502 req->ssids[0].ssid_len,
503 ies->ie[IEEE80211_BAND_5GHZ],
504 ies->len[IEEE80211_BAND_5GHZ],
505 IEEE80211_BAND_5GHZ);
506 if (ret < 0) {
507 wl1271_error("5GHz PROBE request template failed");
508 goto out;
509 }
510 }
511
512 wl1271_dump(DEBUG_SCAN, "SCAN_CFG: ", cfg, sizeof(*cfg));
513
514 ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_CFG, cfg,
515 sizeof(*cfg), 0);
516 if (ret < 0) {
517 wl1271_error("SCAN configuration failed");
518 goto out;
519 }
520out:
521 kfree(cfg);
522 return ret;
523}
524
525int wl1271_scan_sched_scan_start(struct wl1271 *wl)
526{
527 struct wl1271_cmd_sched_scan_start *start;
528 int ret = 0;
529
530 wl1271_debug(DEBUG_CMD, "cmd periodic scan start");
531
532 if (wl->bss_type != BSS_TYPE_STA_BSS)
533 return -EOPNOTSUPP;
534
535 if (!test_bit(WL1271_FLAG_IDLE, &wl->flags))
536 return -EBUSY;
537
538 start = kzalloc(sizeof(*start), GFP_KERNEL);
539 if (!start)
540 return -ENOMEM;
541
542 start->tag = WL1271_SCAN_DEFAULT_TAG;
543
544 ret = wl1271_cmd_send(wl, CMD_START_PERIODIC_SCAN, start,
545 sizeof(*start), 0);
546 if (ret < 0) {
547 wl1271_error("failed to send scan start command");
548 goto out_free;
549 }
550
551out_free:
552 kfree(start);
553 return ret;
554}
555
556void wl1271_scan_sched_scan_results(struct wl1271 *wl)
557{
558 wl1271_debug(DEBUG_SCAN, "got periodic scan results");
559
560 ieee80211_sched_scan_results(wl->hw);
561}
562
563void wl1271_scan_sched_scan_stop(struct wl1271 *wl)
564{
565 struct wl1271_cmd_sched_scan_stop *stop;
566 int ret = 0;
567
568 wl1271_debug(DEBUG_CMD, "cmd periodic scan stop");
569
570 /* FIXME: what to do if alloc'ing to stop fails? */
571 stop = kzalloc(sizeof(*stop), GFP_KERNEL);
572 if (!stop) {
573 wl1271_error("failed to alloc memory to send sched scan stop");
574 return;
575 }
576
577 stop->tag = WL1271_SCAN_DEFAULT_TAG;
578
579 ret = wl1271_cmd_send(wl, CMD_STOP_PERIODIC_SCAN, stop,
580 sizeof(*stop), 0);
581 if (ret < 0) {
582 wl1271_error("failed to send sched scan stop command");
583 goto out_free;
584 }
585 wl->sched_scanning = false;
586
587out_free:
588 kfree(stop);
589}