Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6.git] / drivers / net / wireless / wl12xx / scan.c
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
32 void 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
68 out:
69         mutex_unlock(&wl->mutex);
70
71 }
72
73
74 static 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
137 static 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
214 out:
215         kfree(cmd);
216         kfree(trigger);
217         return ret;
218 }
219
220 void 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
290 int 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
324 static int
325 wl1271_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
383 static int
384 wl1271_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
433 int 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         }
513 out:
514         kfree(cfg);
515         return ret;
516 }
517
518 int 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
544 out_free:
545         kfree(start);
546         return ret;
547 }
548
549 void 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
556 void 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
580 out_free:
581         kfree(stop);
582 }