kernel/drivers/net/wireless/ti/wl12xx/scan.c

   1 /*
   2  * This file is part of wl12xx
   3  *
   4  * Copyright (C) 2012 Texas Instruments. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  18  * 02110-1301 USA
  19  *
  20  */
  21
  22 #include <linux/ieee80211.h>
  23 #include "scan.h"
  24 #include "../wlcore/debug.h"
  25 #include "../wlcore/tx.h"
  26
  27 static int wl1271_get_scan_channels(struct wl1271 *wl,
  28                                     struct cfg80211_scan_request *req,
  29                                     struct basic_scan_channel_params *channels,
  30                                     enum ieee80211_band band, bool passive)
  31 {
  32         struct conf_scan_settings *c = &wl->conf.scan;
  33         int i, j;
  34         u32 flags;
  35
  36         for (i = 0, j = 0;
  37              i < req->n_channels && j < WL1271_SCAN_MAX_CHANNELS;
  38              i++) {
  39                 flags = req->channels[i]->flags;
  40
  41                 if (!test_bit(i, wl->scan.scanned_ch) &&
  42                     !(flags & IEEE80211_CHAN_DISABLED) &&
  43                     (req->channels[i]->band == band) &&
  44                     /*
  45                      * In passive scans, we scan all remaining
  46                      * channels, even if not marked as such.
  47                      * In active scans, we only scan channels not
  48                      * marked as passive.
  49                      */
  50                     (passive || !(flags & IEEE80211_CHAN_NO_IR))) {
  51                         wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
  52                                      req->channels[i]->band,
  53                                      req->channels[i]->center_freq);
  54                         wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
  55                                      req->channels[i]->hw_value,
  56                                      req->channels[i]->flags);
  57                         wl1271_debug(DEBUG_SCAN,
  58                                      "max_antenna_gain %d, max_power %d",
  59                                      req->channels[i]->max_antenna_gain,
  60                                      req->channels[i]->max_power);
  61                         wl1271_debug(DEBUG_SCAN, "beacon_found %d",
  62                                      req->channels[i]->beacon_found);
  63
  64                         if (!passive) {
  65                                 channels[j].min_duration =
  66                                         cpu_to_le32(c->min_dwell_time_active);
  67                                 channels[j].max_duration =
  68                                         cpu_to_le32(c->max_dwell_time_active);
  69                         } else {
  70                                 channels[j].min_duration =
  71                                         cpu_to_le32(c->dwell_time_passive);
  72                                 channels[j].max_duration =
  73                                         cpu_to_le32(c->dwell_time_passive);
  74                         }
  75                         channels[j].early_termination = 0;
  76                         channels[j].tx_power_att = req->channels[i]->max_power;
  77                         channels[j].channel = req->channels[i]->hw_value;
  78
  79                         memset(&channels[j].bssid_lsb, 0xff, 4);
  80                         memset(&channels[j].bssid_msb, 0xff, 2);
  81
  82                         /* Mark the channels we already used */
  83                         set_bit(i, wl->scan.scanned_ch);
  84
  85                         j++;
  86                 }
  87         }
  88
  89         return j;
  90 }
  91
  92 #define WL1271_NOTHING_TO_SCAN 1
  93
  94 static int wl1271_scan_send(struct wl1271 *wl, struct wl12xx_vif *wlvif,
  95                             enum ieee80211_band band,
  96                             bool passive, u32 basic_rate)
  97 {
  98         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
  99         struct wl1271_cmd_scan *cmd;
 100         struct wl1271_cmd_trigger_scan_to *trigger;
 101         int ret;
 102         u16 scan_options = 0;
 103
 104         /* skip active scans if we don't have SSIDs */
 105         if (!passive && wl->scan.req->n_ssids == 0)
 106                 return WL1271_NOTHING_TO_SCAN;
 107
 108         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 109         trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
 110         if (!cmd || !trigger) {
 111                 ret = -ENOMEM;
 112                 goto out;
 113         }
 114
 115         if (wl->conf.scan.split_scan_timeout)
 116                 scan_options |= WL1271_SCAN_OPT_SPLIT_SCAN;
 117
 118         if (passive)
 119                 scan_options |= WL1271_SCAN_OPT_PASSIVE;
 120
 121         cmd->params.role_id = wlvif->role_id;
 122
 123         if (WARN_ON(cmd->params.role_id == WL12XX_INVALID_ROLE_ID)) {
 124                 ret = -EINVAL;
 125                 goto out;
 126         }
 127
 128         cmd->params.scan_options = cpu_to_le16(scan_options);
 129
 130         cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req,
 131                                                     cmd->channels,
 132                                                     band, passive);
 133         if (cmd->params.n_ch == 0) {
 134                 ret = WL1271_NOTHING_TO_SCAN;
 135                 goto out;
 136         }
 137
 138         cmd->params.tx_rate = cpu_to_le32(basic_rate);
 139         cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs;
 140         cmd->params.tid_trigger = CONF_TX_AC_ANY_TID;
 141         cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;
 142
 143         if (band == IEEE80211_BAND_2GHZ)
 144                 cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ;
 145         else
 146                 cmd->params.band = WL1271_SCAN_BAND_5_GHZ;
 147
 148         if (wl->scan.ssid_len && wl->scan.ssid) {
 149                 cmd->params.ssid_len = wl->scan.ssid_len;
 150                 memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len);
 151         }
 152
 153         memcpy(cmd->addr, vif->addr, ETH_ALEN);
 154
 155         ret = wl12xx_cmd_build_probe_req(wl, wlvif,
 156                                          cmd->params.role_id, band,
 157                                          wl->scan.ssid, wl->scan.ssid_len,
 158                                          wl->scan.req->ie,
 159                                          wl->scan.req->ie_len, NULL, 0, false);
 160         if (ret < 0) {
 161                 wl1271_error("PROBE request template failed");
 162                 goto out;
 163         }
 164
 165         trigger->timeout = cpu_to_le32(wl->conf.scan.split_scan_timeout);
 166         ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
 167                               sizeof(*trigger), 0);
 168         if (ret < 0) {
 169                 wl1271_error("trigger scan to failed for hw scan");
 170                 goto out;
 171         }
 172
 173         wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));
 174
 175         ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
 176         if (ret < 0) {
 177                 wl1271_error("SCAN failed");
 178                 goto out;
 179         }
 180
 181 out:
 182         kfree(cmd);
 183         kfree(trigger);
 184         return ret;
 185 }
 186
 187 int wl12xx_scan_stop(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 188 {
 189         struct wl1271_cmd_header *cmd = NULL;
 190         int ret = 0;
 191
 192         if (WARN_ON(wl->scan.state == WL1271_SCAN_STATE_IDLE))
 193                 return -EINVAL;
 194
 195         wl1271_debug(DEBUG_CMD, "cmd scan stop");
 196
 197         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 198         if (!cmd) {
 199                 ret = -ENOMEM;
 200                 goto out;
 201         }
 202
 203         ret = wl1271_cmd_send(wl, CMD_STOP_SCAN, cmd,
 204                               sizeof(*cmd), 0);
 205         if (ret < 0) {
 206                 wl1271_error("cmd stop_scan failed");
 207                 goto out;
 208         }
 209 out:
 210         kfree(cmd);
 211         return ret;
 212 }
 213
 214 void wl1271_scan_stm(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 215 {
 216         int ret = 0;
 217         enum ieee80211_band band;
 218         u32 rate, mask;
 219
 220         switch (wl->scan.state) {
 221         case WL1271_SCAN_STATE_IDLE:
 222                 break;
 223
 224         case WL1271_SCAN_STATE_2GHZ_ACTIVE:
 225                 band = IEEE80211_BAND_2GHZ;
 226                 mask = wlvif->bitrate_masks[band];
 227                 if (wl->scan.req->no_cck) {
 228                         mask &= ~CONF_TX_CCK_RATES;
 229                         if (!mask)
 230                                 mask = CONF_TX_RATE_MASK_BASIC_P2P;
 231                 }
 232                 rate = wl1271_tx_min_rate_get(wl, mask);
 233                 ret = wl1271_scan_send(wl, wlvif, band, false, rate);
 234                 if (ret == WL1271_NOTHING_TO_SCAN) {
 235                         wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE;
 236                         wl1271_scan_stm(wl, wlvif);
 237                 }
 238
 239                 break;
 240
 241         case WL1271_SCAN_STATE_2GHZ_PASSIVE:
 242                 band = IEEE80211_BAND_2GHZ;
 243                 mask = wlvif->bitrate_masks[band];
 244                 if (wl->scan.req->no_cck) {
 245                         mask &= ~CONF_TX_CCK_RATES;
 246                         if (!mask)
 247                                 mask = CONF_TX_RATE_MASK_BASIC_P2P;
 248                 }
 249                 rate = wl1271_tx_min_rate_get(wl, mask);
 250                 ret = wl1271_scan_send(wl, wlvif, band, true, rate);
 251                 if (ret == WL1271_NOTHING_TO_SCAN) {
 252                         if (wl->enable_11a)
 253                                 wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE;
 254                         else
 255                                 wl->scan.state = WL1271_SCAN_STATE_DONE;
 256                         wl1271_scan_stm(wl, wlvif);
 257                 }
 258
 259                 break;
 260
 261         case WL1271_SCAN_STATE_5GHZ_ACTIVE:
 262                 band = IEEE80211_BAND_5GHZ;
 263                 rate = wl1271_tx_min_rate_get(wl, wlvif->bitrate_masks[band]);
 264                 ret = wl1271_scan_send(wl, wlvif, band, false, rate);
 265                 if (ret == WL1271_NOTHING_TO_SCAN) {
 266                         wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE;
 267                         wl1271_scan_stm(wl, wlvif);
 268                 }
 269
 270                 break;
 271
 272         case WL1271_SCAN_STATE_5GHZ_PASSIVE:
 273                 band = IEEE80211_BAND_5GHZ;
 274                 rate = wl1271_tx_min_rate_get(wl, wlvif->bitrate_masks[band]);
 275                 ret = wl1271_scan_send(wl, wlvif, band, true, rate);
 276                 if (ret == WL1271_NOTHING_TO_SCAN) {
 277                         wl->scan.state = WL1271_SCAN_STATE_DONE;
 278                         wl1271_scan_stm(wl, wlvif);
 279                 }
 280
 281                 break;
 282
 283         case WL1271_SCAN_STATE_DONE:
 284                 wl->scan.failed = false;
 285                 cancel_delayed_work(&wl->scan_complete_work);
 286                 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 287                                              msecs_to_jiffies(0));
 288                 break;
 289
 290         default:
 291                 wl1271_error("invalid scan state");
 292                 break;
 293         }
 294
 295         if (ret < 0) {
 296                 cancel_delayed_work(&wl->scan_complete_work);
 297                 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 298                                              msecs_to_jiffies(0));
 299         }
 300 }
 301
 302 static void wl12xx_adjust_channels(struct wl1271_cmd_sched_scan_config *cmd,
 303                                    struct wlcore_scan_channels *cmd_channels)
 304 {
 305         memcpy(cmd->passive, cmd_channels->passive, sizeof(cmd->passive));
 306         memcpy(cmd->active, cmd_channels->active, sizeof(cmd->active));
 307         cmd->dfs = cmd_channels->dfs;
 308         cmd->n_pactive_ch = cmd_channels->passive_active;
 309
 310         memcpy(cmd->channels_2, cmd_channels->channels_2,
 311                sizeof(cmd->channels_2));
 312         memcpy(cmd->channels_5, cmd_channels->channels_5,
 313                sizeof(cmd->channels_5));
 314         /* channels_4 are not supported, so no need to copy them */
 315 }
 316
 317 int wl1271_scan_sched_scan_config(struct wl1271 *wl,
 318                                   struct wl12xx_vif *wlvif,
 319                                   struct cfg80211_sched_scan_request *req,
 320                                   struct ieee80211_scan_ies *ies)
 321 {
 322         struct wl1271_cmd_sched_scan_config *cfg = NULL;
 323         struct wlcore_scan_channels *cfg_channels = NULL;
 324         struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 325         int i, ret;
 326         bool force_passive = !req->n_ssids;
 327
 328         wl1271_debug(DEBUG_CMD, "cmd sched_scan scan config");
 329
 330         cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
 331         if (!cfg)
 332                 return -ENOMEM;
 333
 334         cfg->role_id = wlvif->role_id;
 335         cfg->rssi_threshold = c->rssi_threshold;
 336         cfg->snr_threshold  = c->snr_threshold;
 337         cfg->n_probe_reqs = c->num_probe_reqs;
 338         /* cycles set to 0 it means infinite (until manually stopped) */
 339         cfg->cycles = 0;
 340         /* report APs when at least 1 is found */
 341         cfg->report_after = 1;
 342         /* don't stop scanning automatically when something is found */
 343         cfg->terminate = 0;
 344         cfg->tag = WL1271_SCAN_DEFAULT_TAG;
 345         /* don't filter on BSS type */
 346         cfg->bss_type = SCAN_BSS_TYPE_ANY;
 347         /* currently NL80211 supports only a single interval */
 348         for (i = 0; i < SCAN_MAX_CYCLE_INTERVALS; i++)
 349                 cfg->intervals[i] = cpu_to_le32(req->interval);
 350
 351         cfg->ssid_len = 0;
 352         ret = wlcore_scan_sched_scan_ssid_list(wl, wlvif, req);
 353         if (ret < 0)
 354                 goto out;
 355
 356         cfg->filter_type = ret;
 357
 358         wl1271_debug(DEBUG_SCAN, "filter_type = %d", cfg->filter_type);
 359
 360         cfg_channels = kzalloc(sizeof(*cfg_channels), GFP_KERNEL);
 361         if (!cfg_channels) {
 362                 ret = -ENOMEM;
 363                 goto out;
 364         }
 365
 366         if (!wlcore_set_scan_chan_params(wl, cfg_channels, req->channels,
 367                                          req->n_channels, req->n_ssids,
 368                                          SCAN_TYPE_PERIODIC)) {
 369                 wl1271_error("scan channel list is empty");
 370                 ret = -EINVAL;
 371                 goto out;
 372         }
 373         wl12xx_adjust_channels(cfg, cfg_channels);
 374
 375         if (!force_passive && cfg->active[0]) {
 376                 u8 band = IEEE80211_BAND_2GHZ;
 377                 ret = wl12xx_cmd_build_probe_req(wl, wlvif,
 378                                                  wlvif->role_id, band,
 379                                                  req->ssids[0].ssid,
 380                                                  req->ssids[0].ssid_len,
 381                                                  ies->ies[band],
 382                                                  ies->len[band],
 383                                                  ies->common_ies,
 384                                                  ies->common_ie_len,
 385                                                  true);
 386                 if (ret < 0) {
 387                         wl1271_error("2.4GHz PROBE request template failed");
 388                         goto out;
 389                 }
 390         }
 391
 392         if (!force_passive && cfg->active[1]) {
 393                 u8 band = IEEE80211_BAND_5GHZ;
 394                 ret = wl12xx_cmd_build_probe_req(wl, wlvif,
 395                                                  wlvif->role_id, band,
 396                                                  req->ssids[0].ssid,
 397                                                  req->ssids[0].ssid_len,
 398                                                  ies->ies[band],
 399                                                  ies->len[band],
 400                                                  ies->common_ies,
 401                                                  ies->common_ie_len,
 402                                                  true);
 403                 if (ret < 0) {
 404                         wl1271_error("5GHz PROBE request template failed");
 405                         goto out;
 406                 }
 407         }
 408
 409         wl1271_dump(DEBUG_SCAN, "SCAN_CFG: ", cfg, sizeof(*cfg));
 410
 411         ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_CFG, cfg,
 412                               sizeof(*cfg), 0);
 413         if (ret < 0) {
 414                 wl1271_error("SCAN configuration failed");
 415                 goto out;
 416         }
 417 out:
 418         kfree(cfg_channels);
 419         kfree(cfg);
 420         return ret;
 421 }
 422
 423 int wl1271_scan_sched_scan_start(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 424 {
 425         struct wl1271_cmd_sched_scan_start *start;
 426         int ret = 0;
 427
 428         wl1271_debug(DEBUG_CMD, "cmd periodic scan start");
 429
 430         if (wlvif->bss_type != BSS_TYPE_STA_BSS)
 431                 return -EOPNOTSUPP;
 432
 433         if ((wl->quirks & WLCORE_QUIRK_NO_SCHED_SCAN_WHILE_CONN) &&
 434             test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags))
 435                 return -EBUSY;
 436
 437         start = kzalloc(sizeof(*start), GFP_KERNEL);
 438         if (!start)
 439                 return -ENOMEM;
 440
 441         start->role_id = wlvif->role_id;
 442         start->tag = WL1271_SCAN_DEFAULT_TAG;
 443
 444         ret = wl1271_cmd_send(wl, CMD_START_PERIODIC_SCAN, start,
 445                               sizeof(*start), 0);
 446         if (ret < 0) {
 447                 wl1271_error("failed to send scan start command");
 448                 goto out_free;
 449         }
 450
 451 out_free:
 452         kfree(start);
 453         return ret;
 454 }
 455
 456 int wl12xx_sched_scan_start(struct wl1271 *wl, struct wl12xx_vif  *wlvif,
 457                             struct cfg80211_sched_scan_request *req,
 458                             struct ieee80211_scan_ies *ies)
 459 {
 460         int ret;
 461
 462         ret = wl1271_scan_sched_scan_config(wl, wlvif, req, ies);
 463         if (ret < 0)
 464                 return ret;
 465
 466         return wl1271_scan_sched_scan_start(wl, wlvif);
 467 }
 468
 469 void wl12xx_scan_sched_scan_stop(struct wl1271 *wl,  struct wl12xx_vif *wlvif)
 470 {
 471         struct wl1271_cmd_sched_scan_stop *stop;
 472         int ret = 0;
 473
 474         wl1271_debug(DEBUG_CMD, "cmd periodic scan stop");
 475
 476         /* FIXME: what to do if alloc'ing to stop fails? */
 477         stop = kzalloc(sizeof(*stop), GFP_KERNEL);
 478         if (!stop) {
 479                 wl1271_error("failed to alloc memory to send sched scan stop");
 480                 return;
 481         }
 482
 483         stop->role_id = wlvif->role_id;
 484         stop->tag = WL1271_SCAN_DEFAULT_TAG;
 485
 486         ret = wl1271_cmd_send(wl, CMD_STOP_PERIODIC_SCAN, stop,
 487                               sizeof(*stop), 0);
 488         if (ret < 0) {
 489                 wl1271_error("failed to send sched scan stop command");
 490                 goto out_free;
 491         }
 492
 493 out_free:
 494         kfree(stop);
 495 }
 496
 497 int wl12xx_scan_start(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 498                       struct cfg80211_scan_request *req)
 499 {
 500         wl1271_scan_stm(wl, wlvif);
 501         return 0;
 502 }
 503
 504 void wl12xx_scan_completed(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 505 {
 506         wl1271_scan_stm(wl, wlvif);
 507 }