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 "debug.h"
  28 #include "cmd.h"
  29 #include "scan.h"
  30 #include "acx.h"
  31 #include "ps.h"
  32 #include "tx.h"
  33
  34 void wl1271_scan_complete_work(struct work_struct *work)
  35 {
  36         struct delayed_work *dwork;
  37         struct wl1271 *wl;
  38         struct ieee80211_vif *vif;
  39         struct wl12xx_vif *wlvif;
  40         int ret;
  41         bool is_sta, is_ibss;
  42
  43         dwork = container_of(work, struct delayed_work, work);
  44         wl = container_of(dwork, struct wl1271, scan_complete_work);
  45
  46         wl1271_debug(DEBUG_SCAN, "Scanning complete");
  47
  48         mutex_lock(&wl->mutex);
  49
  50         if (wl->state == WL1271_STATE_OFF)
  51                 goto out;
  52
  53         if (wl->scan.state == WL1271_SCAN_STATE_IDLE)
  54                 goto out;
  55
  56         vif = wl->scan_vif;
  57         wlvif = wl12xx_vif_to_data(vif);
  58
  59         wl->scan.state = WL1271_SCAN_STATE_IDLE;
  60         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
  61         wl->scan.req = NULL;
  62         wl->scan_vif = NULL;
  63
  64         ret = wl1271_ps_elp_wakeup(wl);
  65         if (ret < 0)
  66                 goto out;
  67
  68         if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags)) {
  69                 /* restore hardware connection monitoring template */
  70                 wl1271_cmd_build_ap_probe_req(wl, wlvif, wlvif->probereq);
  71         }
  72
  73         /* return to ROC if needed */
  74         is_sta = (wlvif->bss_type == BSS_TYPE_STA_BSS);
  75         is_ibss = (wlvif->bss_type == BSS_TYPE_IBSS);
  76         if (((is_sta && !test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags)) ||
  77              (is_ibss && !test_bit(WLVIF_FLAG_IBSS_JOINED, &wlvif->flags))) &&
  78             !test_bit(wlvif->dev_role_id, wl->roc_map)) {
  79                 /* restore remain on channel */
  80                 wl12xx_start_dev(wl, wlvif);
  81         }
  82         wl1271_ps_elp_sleep(wl);
  83
  84         if (wl->scan.failed) {
  85                 wl1271_info("Scan completed due to error.");
  86                 wl12xx_queue_recovery_work(wl);
  87         }
  88
  89         ieee80211_scan_completed(wl->hw, false);
  90
  91 out:
  92         mutex_unlock(&wl->mutex);
  93
  94 }
  95
  96
  97 static int wl1271_get_scan_channels(struct wl1271 *wl,
  98                                     struct cfg80211_scan_request *req,
  99                                     struct basic_scan_channel_params *channels,
 100                                     enum ieee80211_band band, bool passive)
 101 {
 102         struct conf_scan_settings *c = &wl->conf.scan;
 103         int i, j;
 104         u32 flags;
 105
 106         for (i = 0, j = 0;
 107              i < req->n_channels && j < WL1271_SCAN_MAX_CHANNELS;
 108              i++) {
 109                 flags = req->channels[i]->flags;
 110
 111                 if (!test_bit(i, wl->scan.scanned_ch) &&
 112                     !(flags & IEEE80211_CHAN_DISABLED) &&
 113                     (req->channels[i]->band == band) &&
 114                     /*
 115                      * In passive scans, we scan all remaining
 116                      * channels, even if not marked as such.
 117                      * In active scans, we only scan channels not
 118                      * marked as passive.
 119                      */
 120                     (passive || !(flags & IEEE80211_CHAN_PASSIVE_SCAN))) {
 121                         wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
 122                                      req->channels[i]->band,
 123                                      req->channels[i]->center_freq);
 124                         wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
 125                                      req->channels[i]->hw_value,
 126                                      req->channels[i]->flags);
 127                         wl1271_debug(DEBUG_SCAN,
 128                                      "max_antenna_gain %d, max_power %d",
 129                                      req->channels[i]->max_antenna_gain,
 130                                      req->channels[i]->max_power);
 131                         wl1271_debug(DEBUG_SCAN, "beacon_found %d",
 132                                      req->channels[i]->beacon_found);
 133
 134                         if (!passive) {
 135                                 channels[j].min_duration =
 136                                         cpu_to_le32(c->min_dwell_time_active);
 137                                 channels[j].max_duration =
 138                                         cpu_to_le32(c->max_dwell_time_active);
 139                         } else {
 140                                 channels[j].min_duration =
 141                                         cpu_to_le32(c->min_dwell_time_passive);
 142                                 channels[j].max_duration =
 143                                         cpu_to_le32(c->max_dwell_time_passive);
 144                         }
 145                         channels[j].early_termination = 0;
 146                         channels[j].tx_power_att = req->channels[i]->max_power;
 147                         channels[j].channel = req->channels[i]->hw_value;
 148
 149                         memset(&channels[j].bssid_lsb, 0xff, 4);
 150                         memset(&channels[j].bssid_msb, 0xff, 2);
 151
 152                         /* Mark the channels we already used */
 153                         set_bit(i, wl->scan.scanned_ch);
 154
 155                         j++;
 156                 }
 157         }
 158
 159         return j;
 160 }
 161
 162 #define WL1271_NOTHING_TO_SCAN 1
 163
 164 static int wl1271_scan_send(struct wl1271 *wl, struct ieee80211_vif *vif,
 165                             enum ieee80211_band band,
 166                             bool passive, u32 basic_rate)
 167 {
 168         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 169         struct wl1271_cmd_scan *cmd;
 170         struct wl1271_cmd_trigger_scan_to *trigger;
 171         int ret;
 172         u16 scan_options = 0;
 173
 174         /* skip active scans if we don't have SSIDs */
 175         if (!passive && wl->scan.req->n_ssids == 0)
 176                 return WL1271_NOTHING_TO_SCAN;
 177
 178         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 179         trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
 180         if (!cmd || !trigger) {
 181                 ret = -ENOMEM;
 182                 goto out;
 183         }
 184
 185         if (passive)
 186                 scan_options |= WL1271_SCAN_OPT_PASSIVE;
 187
 188         if (WARN_ON(wlvif->role_id == WL12XX_INVALID_ROLE_ID)) {
 189                 ret = -EINVAL;
 190                 goto out;
 191         }
 192         cmd->params.role_id = wlvif->role_id;
 193         cmd->params.scan_options = cpu_to_le16(scan_options);
 194
 195         cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req,
 196                                                     cmd->channels,
 197                                                     band, passive);
 198         if (cmd->params.n_ch == 0) {
 199                 ret = WL1271_NOTHING_TO_SCAN;
 200                 goto out;
 201         }
 202
 203         cmd->params.tx_rate = cpu_to_le32(basic_rate);
 204         cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs;
 205         cmd->params.tid_trigger = 0;
 206         cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;
 207
 208         if (band == IEEE80211_BAND_2GHZ)
 209                 cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ;
 210         else
 211                 cmd->params.band = WL1271_SCAN_BAND_5_GHZ;
 212
 213         if (wl->scan.ssid_len && wl->scan.ssid) {
 214                 cmd->params.ssid_len = wl->scan.ssid_len;
 215                 memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len);
 216         }
 217
 218         memcpy(cmd->addr, vif->addr, ETH_ALEN);
 219
 220         ret = wl1271_cmd_build_probe_req(wl, wlvif, wl->scan.ssid,
 221                                          wl->scan.ssid_len, wl->scan.req->ie,
 222                                          wl->scan.req->ie_len, band);
 223         if (ret < 0) {
 224                 wl1271_error("PROBE request template failed");
 225                 goto out;
 226         }
 227
 228         /* disable the timeout */
 229         trigger->timeout = 0;
 230         ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
 231                               sizeof(*trigger), 0);
 232         if (ret < 0) {
 233                 wl1271_error("trigger scan to failed for hw scan");
 234                 goto out;
 235         }
 236
 237         wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));
 238
 239         ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
 240         if (ret < 0) {
 241                 wl1271_error("SCAN failed");
 242                 goto out;
 243         }
 244
 245 out:
 246         kfree(cmd);
 247         kfree(trigger);
 248         return ret;
 249 }
 250
 251 void wl1271_scan_stm(struct wl1271 *wl, struct ieee80211_vif *vif)
 252 {
 253         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 254         int ret = 0;
 255         enum ieee80211_band band;
 256         u32 rate, mask;
 257
 258         switch (wl->scan.state) {
 259         case WL1271_SCAN_STATE_IDLE:
 260                 break;
 261
 262         case WL1271_SCAN_STATE_2GHZ_ACTIVE:
 263                 band = IEEE80211_BAND_2GHZ;
 264                 mask = wlvif->bitrate_masks[band];
 265                 if (wl->scan.req->no_cck) {
 266                         mask &= ~CONF_TX_CCK_RATES;
 267                         if (!mask)
 268                                 mask = CONF_TX_RATE_MASK_BASIC_P2P;
 269                 }
 270                 rate = wl1271_tx_min_rate_get(wl, mask);
 271                 ret = wl1271_scan_send(wl, vif, band, false, rate);
 272                 if (ret == WL1271_NOTHING_TO_SCAN) {
 273                         wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE;
 274                         wl1271_scan_stm(wl, vif);
 275                 }
 276
 277                 break;
 278
 279         case WL1271_SCAN_STATE_2GHZ_PASSIVE:
 280                 band = IEEE80211_BAND_2GHZ;
 281                 mask = wlvif->bitrate_masks[band];
 282                 if (wl->scan.req->no_cck) {
 283                         mask &= ~CONF_TX_CCK_RATES;
 284                         if (!mask)
 285                                 mask = CONF_TX_RATE_MASK_BASIC_P2P;
 286                 }
 287                 rate = wl1271_tx_min_rate_get(wl, mask);
 288                 ret = wl1271_scan_send(wl, vif, band, true, rate);
 289                 if (ret == WL1271_NOTHING_TO_SCAN) {
 290                         if (wl->enable_11a)
 291                                 wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE;
 292                         else
 293                                 wl->scan.state = WL1271_SCAN_STATE_DONE;
 294                         wl1271_scan_stm(wl, vif);
 295                 }
 296
 297                 break;
 298
 299         case WL1271_SCAN_STATE_5GHZ_ACTIVE:
 300                 band = IEEE80211_BAND_5GHZ;
 301                 rate = wl1271_tx_min_rate_get(wl, wlvif->bitrate_masks[band]);
 302                 ret = wl1271_scan_send(wl, vif, band, false, rate);
 303                 if (ret == WL1271_NOTHING_TO_SCAN) {
 304                         wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE;
 305                         wl1271_scan_stm(wl, vif);
 306                 }
 307
 308                 break;
 309
 310         case WL1271_SCAN_STATE_5GHZ_PASSIVE:
 311                 band = IEEE80211_BAND_5GHZ;
 312                 rate = wl1271_tx_min_rate_get(wl, wlvif->bitrate_masks[band]);
 313                 ret = wl1271_scan_send(wl, vif, band, true, rate);
 314                 if (ret == WL1271_NOTHING_TO_SCAN) {
 315                         wl->scan.state = WL1271_SCAN_STATE_DONE;
 316                         wl1271_scan_stm(wl, vif);
 317                 }
 318
 319                 break;
 320
 321         case WL1271_SCAN_STATE_DONE:
 322                 wl->scan.failed = false;
 323                 cancel_delayed_work(&wl->scan_complete_work);
 324                 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 325                                              msecs_to_jiffies(0));
 326                 break;
 327
 328         default:
 329                 wl1271_error("invalid scan state");
 330                 break;
 331         }
 332
 333         if (ret < 0) {
 334                 cancel_delayed_work(&wl->scan_complete_work);
 335                 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 336                                              msecs_to_jiffies(0));
 337         }
 338 }
 339
 340 int wl1271_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
 341                 const u8 *ssid, size_t ssid_len,
 342                 struct cfg80211_scan_request *req)
 343 {
 344         /*
 345          * cfg80211 should guarantee that we don't get more channels
 346          * than what we have registered.
 347          */
 348         BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
 349
 350         if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
 351                 return -EBUSY;
 352
 353         wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
 354
 355         if (ssid_len && ssid) {
 356                 wl->scan.ssid_len = ssid_len;
 357                 memcpy(wl->scan.ssid, ssid, ssid_len);
 358         } else {
 359                 wl->scan.ssid_len = 0;
 360         }
 361
 362         wl->scan_vif = vif;
 363         wl->scan.req = req;
 364         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
 365
 366         /* we assume failure so that timeout scenarios are handled correctly */
 367         wl->scan.failed = true;
 368         ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 369                                      msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
 370
 371         wl1271_scan_stm(wl, vif);
 372
 373         return 0;
 374 }
 375
 376 int wl1271_scan_stop(struct wl1271 *wl)
 377 {
 378         struct wl1271_cmd_header *cmd = NULL;
 379         int ret = 0;
 380
 381         if (WARN_ON(wl->scan.state == WL1271_SCAN_STATE_IDLE))
 382                 return -EINVAL;
 383
 384         wl1271_debug(DEBUG_CMD, "cmd scan stop");
 385
 386         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 387         if (!cmd) {
 388                 ret = -ENOMEM;
 389                 goto out;
 390         }
 391
 392         ret = wl1271_cmd_send(wl, CMD_STOP_SCAN, cmd,
 393                               sizeof(*cmd), 0);
 394         if (ret < 0) {
 395                 wl1271_error("cmd stop_scan failed");
 396                 goto out;
 397         }
 398 out:
 399         kfree(cmd);
 400         return ret;
 401 }
 402
 403 static int
 404 wl1271_scan_get_sched_scan_channels(struct wl1271 *wl,
 405                                     struct cfg80211_sched_scan_request *req,
 406                                     struct conn_scan_ch_params *channels,
 407                                     u32 band, bool radar, bool passive,
 408                                     int start, int max_channels)
 409 {
 410         struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 411         int i, j;
 412         u32 flags;
 413         bool force_passive = !req->n_ssids;
 414
 415         for (i = 0, j = start;
 416              i < req->n_channels && j < max_channels;
 417              i++) {
 418                 flags = req->channels[i]->flags;
 419
 420                 if (force_passive)
 421                         flags |= IEEE80211_CHAN_PASSIVE_SCAN;
 422
 423                 if ((req->channels[i]->band == band) &&
 424                     !(flags & IEEE80211_CHAN_DISABLED) &&
 425                     (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
 426                     /* if radar is set, we ignore the passive flag */
 427                     (radar ||
 428                      !!(flags & IEEE80211_CHAN_PASSIVE_SCAN) == passive)) {
 429                         wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
 430                                      req->channels[i]->band,
 431                                      req->channels[i]->center_freq);
 432                         wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
 433                                      req->channels[i]->hw_value,
 434                                      req->channels[i]->flags);
 435                         wl1271_debug(DEBUG_SCAN, "max_power %d",
 436                                      req->channels[i]->max_power);
 437
 438                         if (flags & IEEE80211_CHAN_RADAR) {
 439                                 channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
 440
 441                                 channels[j].passive_duration =
 442                                         cpu_to_le16(c->dwell_time_dfs);
 443                         } else {
 444                                 channels[j].passive_duration =
 445                                         cpu_to_le16(c->dwell_time_passive);
 446                         }
 447
 448                         channels[j].min_duration =
 449                                 cpu_to_le16(c->min_dwell_time_active);
 450                         channels[j].max_duration =
 451                                 cpu_to_le16(c->max_dwell_time_active);
 452
 453                         channels[j].tx_power_att = req->channels[i]->max_power;
 454                         channels[j].channel = req->channels[i]->hw_value;
 455
 456                         j++;
 457                 }
 458         }
 459
 460         return j - start;
 461 }
 462
 463 static bool
 464 wl1271_scan_sched_scan_channels(struct wl1271 *wl,
 465                                 struct cfg80211_sched_scan_request *req,
 466                                 struct wl1271_cmd_sched_scan_config *cfg)
 467 {
 468         cfg->passive[0] =
 469                 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_2,
 470                                                     IEEE80211_BAND_2GHZ,
 471                                                     false, true, 0,
 472                                                     MAX_CHANNELS_2GHZ);
 473         cfg->active[0] =
 474                 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_2,
 475                                                     IEEE80211_BAND_2GHZ,
 476                                                     false, false,
 477                                                     cfg->passive[0],
 478                                                     MAX_CHANNELS_2GHZ);
 479         cfg->passive[1] =
 480                 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_5,
 481                                                     IEEE80211_BAND_5GHZ,
 482                                                     false, true, 0,
 483                                                     MAX_CHANNELS_5GHZ);
 484         cfg->dfs =
 485                 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_5,
 486                                                     IEEE80211_BAND_5GHZ,
 487                                                     true, true,
 488                                                     cfg->passive[1],
 489                                                     MAX_CHANNELS_5GHZ);
 490         cfg->active[1] =
 491                 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_5,
 492                                                     IEEE80211_BAND_5GHZ,
 493                                                     false, false,
 494                                                     cfg->passive[1] + cfg->dfs,
 495                                                     MAX_CHANNELS_5GHZ);
 496         /* 802.11j channels are not supported yet */
 497         cfg->passive[2] = 0;
 498         cfg->active[2] = 0;
 499
 500         wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
 501                      cfg->active[0], cfg->passive[0]);
 502         wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
 503                      cfg->active[1], cfg->passive[1]);
 504         wl1271_debug(DEBUG_SCAN, "    DFS: %d", cfg->dfs);
 505
 506         return  cfg->passive[0] || cfg->active[0] ||
 507                 cfg->passive[1] || cfg->active[1] || cfg->dfs ||
 508                 cfg->passive[2] || cfg->active[2];
 509 }
 510
 511 /* Returns the scan type to be used or a negative value on error */
 512 static int
 513 wl12xx_scan_sched_scan_ssid_list(struct wl1271 *wl,
 514                                  struct cfg80211_sched_scan_request *req)
 515 {
 516         struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
 517         struct cfg80211_match_set *sets = req->match_sets;
 518         struct cfg80211_ssid *ssids = req->ssids;
 519         int ret = 0, type, i, j, n_match_ssids = 0;
 520
 521         wl1271_debug(DEBUG_CMD, "cmd sched scan ssid list");
 522
 523         /* count the match sets that contain SSIDs */
 524         for (i = 0; i < req->n_match_sets; i++)
 525                 if (sets[i].ssid.ssid_len > 0)
 526                         n_match_ssids++;
 527
 528         /* No filter, no ssids or only bcast ssid */
 529         if (!n_match_ssids &&
 530             (!req->n_ssids ||
 531              (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
 532                 type = SCAN_SSID_FILTER_ANY;
 533                 goto out;
 534         }
 535
 536         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 537         if (!cmd) {
 538                 ret = -ENOMEM;
 539                 goto out;
 540         }
 541
 542         if (!n_match_ssids) {
 543                 /* No filter, with ssids */
 544                 type = SCAN_SSID_FILTER_DISABLED;
 545
 546                 for (i = 0; i < req->n_ssids; i++) {
 547                         cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
 548                                 SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
 549                         cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
 550                         memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
 551                                ssids[i].ssid_len);
 552                         cmd->n_ssids++;
 553                 }
 554         } else {
 555                 type = SCAN_SSID_FILTER_LIST;
 556
 557                 /* Add all SSIDs from the filters */
 558                 for (i = 0; i < req->n_match_sets; i++) {
 559                         /* ignore sets without SSIDs */
 560                         if (!sets[i].ssid.ssid_len)
 561                                 continue;
 562
 563                         cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
 564                         cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
 565                         memcpy(cmd->ssids[cmd->n_ssids].ssid,
 566                                sets[i].ssid.ssid, sets[i].ssid.ssid_len);
 567                         cmd->n_ssids++;
 568                 }
 569                 if ((req->n_ssids > 1) ||
 570                     (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
 571                         /*
 572                          * Mark all the SSIDs passed in the SSID list as HIDDEN,
 573                          * so they're used in probe requests.
 574                          */
 575                         for (i = 0; i < req->n_ssids; i++) {
 576                                 if (!req->ssids[i].ssid_len)
 577                                         continue;
 578
 579                                 for (j = 0; j < cmd->n_ssids; j++)
 580                                         if (!memcmp(req->ssids[i].ssid,
 581                                                    cmd->ssids[j].ssid,
 582                                                    req->ssids[i].ssid_len)) {
 583                                                 cmd->ssids[j].type =
 584                                                         SCAN_SSID_TYPE_HIDDEN;
 585                                                 break;
 586                                         }
 587                                 /* Fail if SSID isn't present in the filters */
 588                                 if (j == cmd->n_ssids) {
 589                                         ret = -EINVAL;
 590                                         goto out_free;
 591                                 }
 592                         }
 593                 }
 594         }
 595
 596         wl1271_dump(DEBUG_SCAN, "SSID_LIST: ", cmd, sizeof(*cmd));
 597
 598         ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
 599                               sizeof(*cmd), 0);
 600         if (ret < 0) {
 601                 wl1271_error("cmd sched scan ssid list failed");
 602                 goto out_free;
 603         }
 604
 605 out_free:
 606         kfree(cmd);
 607 out:
 608         if (ret < 0)
 609                 return ret;
 610         return type;
 611 }
 612
 613 int wl1271_scan_sched_scan_config(struct wl1271 *wl,
 614                                   struct wl12xx_vif *wlvif,
 615                                   struct cfg80211_sched_scan_request *req,
 616                                   struct ieee80211_sched_scan_ies *ies)
 617 {
 618         struct wl1271_cmd_sched_scan_config *cfg = NULL;
 619         struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 620         int i, ret;
 621         bool force_passive = !req->n_ssids;
 622
 623         wl1271_debug(DEBUG_CMD, "cmd sched_scan scan config");
 624
 625         cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
 626         if (!cfg)
 627                 return -ENOMEM;
 628
 629         cfg->rssi_threshold = c->rssi_threshold;
 630         cfg->snr_threshold  = c->snr_threshold;
 631         cfg->n_probe_reqs = c->num_probe_reqs;
 632         /* cycles set to 0 it means infinite (until manually stopped) */
 633         cfg->cycles = 0;
 634         /* report APs when at least 1 is found */
 635         cfg->report_after = 1;
 636         /* don't stop scanning automatically when something is found */
 637         cfg->terminate = 0;
 638         cfg->tag = WL1271_SCAN_DEFAULT_TAG;
 639         /* don't filter on BSS type */
 640         cfg->bss_type = SCAN_BSS_TYPE_ANY;
 641         /* currently NL80211 supports only a single interval */
 642         for (i = 0; i < SCAN_MAX_CYCLE_INTERVALS; i++)
 643                 cfg->intervals[i] = cpu_to_le32(req->interval);
 644
 645         cfg->ssid_len = 0;
 646         ret = wl12xx_scan_sched_scan_ssid_list(wl, req);
 647         if (ret < 0)
 648                 goto out;
 649
 650         cfg->filter_type = ret;
 651
 652         wl1271_debug(DEBUG_SCAN, "filter_type = %d", cfg->filter_type);
 653
 654         if (!wl1271_scan_sched_scan_channels(wl, req, cfg)) {
 655                 wl1271_error("scan channel list is empty");
 656                 ret = -EINVAL;
 657                 goto out;
 658         }
 659
 660         if (!force_passive && cfg->active[0]) {
 661                 ret = wl1271_cmd_build_probe_req(wl, wlvif, req->ssids[0].ssid,
 662                                                  req->ssids[0].ssid_len,
 663                                                  ies->ie[IEEE80211_BAND_2GHZ],
 664                                                  ies->len[IEEE80211_BAND_2GHZ],
 665                                                  IEEE80211_BAND_2GHZ);
 666                 if (ret < 0) {
 667                         wl1271_error("2.4GHz PROBE request template failed");
 668                         goto out;
 669                 }
 670         }
 671
 672         if (!force_passive && cfg->active[1]) {
 673                 ret = wl1271_cmd_build_probe_req(wl, wlvif, req->ssids[0].ssid,
 674                                                  req->ssids[0].ssid_len,
 675                                                  ies->ie[IEEE80211_BAND_5GHZ],
 676                                                  ies->len[IEEE80211_BAND_5GHZ],
 677                                                  IEEE80211_BAND_5GHZ);
 678                 if (ret < 0) {
 679                         wl1271_error("5GHz PROBE request template failed");
 680                         goto out;
 681                 }
 682         }
 683
 684         wl1271_dump(DEBUG_SCAN, "SCAN_CFG: ", cfg, sizeof(*cfg));
 685
 686         ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_CFG, cfg,
 687                               sizeof(*cfg), 0);
 688         if (ret < 0) {
 689                 wl1271_error("SCAN configuration failed");
 690                 goto out;
 691         }
 692 out:
 693         kfree(cfg);
 694         return ret;
 695 }
 696
 697 int wl1271_scan_sched_scan_start(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 698 {
 699         struct wl1271_cmd_sched_scan_start *start;
 700         int ret = 0;
 701
 702         wl1271_debug(DEBUG_CMD, "cmd periodic scan start");
 703
 704         if (wlvif->bss_type != BSS_TYPE_STA_BSS)
 705                 return -EOPNOTSUPP;
 706
 707         if (test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags))
 708                 return -EBUSY;
 709
 710         start = kzalloc(sizeof(*start), GFP_KERNEL);
 711         if (!start)
 712                 return -ENOMEM;
 713
 714         start->tag = WL1271_SCAN_DEFAULT_TAG;
 715
 716         ret = wl1271_cmd_send(wl, CMD_START_PERIODIC_SCAN, start,
 717                               sizeof(*start), 0);
 718         if (ret < 0) {
 719                 wl1271_error("failed to send scan start command");
 720                 goto out_free;
 721         }
 722
 723 out_free:
 724         kfree(start);
 725         return ret;
 726 }
 727
 728 void wl1271_scan_sched_scan_results(struct wl1271 *wl)
 729 {
 730         wl1271_debug(DEBUG_SCAN, "got periodic scan results");
 731
 732         ieee80211_sched_scan_results(wl->hw);
 733 }
 734
 735 void wl1271_scan_sched_scan_stop(struct wl1271 *wl)
 736 {
 737         struct wl1271_cmd_sched_scan_stop *stop;
 738         int ret = 0;
 739
 740         wl1271_debug(DEBUG_CMD, "cmd periodic scan stop");
 741
 742         /* FIXME: what to do if alloc'ing to stop fails? */
 743         stop = kzalloc(sizeof(*stop), GFP_KERNEL);
 744         if (!stop) {
 745                 wl1271_error("failed to alloc memory to send sched scan stop");
 746                 return;
 747         }
 748
 749         stop->tag = WL1271_SCAN_DEFAULT_TAG;
 750
 751         ret = wl1271_cmd_send(wl, CMD_STOP_PERIODIC_SCAN, stop,
 752                               sizeof(*stop), 0);
 753         if (ret < 0) {
 754                 wl1271_error("failed to send sched scan stop command");
 755                 goto out_free;
 756         }
 757
 758 out_free:
 759         kfree(stop);
 760 }