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 #include "tx.h"
  32
  33 void wl1271_scan_complete_work(struct work_struct *work)
  34 {
  35         struct delayed_work *dwork;
  36         struct wl1271 *wl;
  37         int ret;
  38         bool is_sta, is_ibss;
  39
  40         dwork = container_of(work, struct delayed_work, work);
  41         wl = container_of(dwork, struct wl1271, scan_complete_work);
  42
  43         wl1271_debug(DEBUG_SCAN, "Scanning complete");
  44
  45         mutex_lock(&wl->mutex);
  46
  47         if (wl->state == WL1271_STATE_OFF)
  48                 goto out;
  49
  50         if (wl->scan.state == WL1271_SCAN_STATE_IDLE)
  51                 goto out;
  52
  53         wl->scan.state = WL1271_SCAN_STATE_IDLE;
  54         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
  55         wl->scan.req = NULL;
  56
  57         ret = wl1271_ps_elp_wakeup(wl);
  58         if (ret < 0)
  59                 goto out;
  60
  61         if (test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags)) {
  62                 /* restore hardware connection monitoring template */
  63                 wl1271_cmd_build_ap_probe_req(wl, wl->probereq);
  64         }
  65
  66         /* return to ROC if needed */
  67         is_sta = (wl->bss_type == BSS_TYPE_STA_BSS);
  68         is_ibss = (wl->bss_type == BSS_TYPE_IBSS);
  69         if (((is_sta && !test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags)) ||
  70              (is_ibss && !test_bit(WL1271_FLAG_IBSS_JOINED, &wl->flags))) &&
  71             !test_bit(wl->dev_role_id, wl->roc_map)) {
  72                 /* restore remain on channel */
  73                 wl12xx_cmd_role_start_dev(wl);
  74                 wl12xx_roc(wl, wl->dev_role_id);
  75         }
  76         wl1271_ps_elp_sleep(wl);
  77
  78         if (wl->scan.failed) {
  79                 wl1271_info("Scan completed due to error.");
  80                 wl12xx_queue_recovery_work(wl);
  81         }
  82
  83         ieee80211_scan_completed(wl->hw, false);
  84
  85 out:
  86         mutex_unlock(&wl->mutex);
  87
  88 }
  89
  90
  91 static int wl1271_get_scan_channels(struct wl1271 *wl,
  92                                     struct cfg80211_scan_request *req,
  93                                     struct basic_scan_channel_params *channels,
  94                                     enum ieee80211_band band, bool passive)
  95 {
  96         struct conf_scan_settings *c = &wl->conf.scan;
  97         int i, j;
  98         u32 flags;
  99
 100         for (i = 0, j = 0;
 101              i < req->n_channels && j < WL1271_SCAN_MAX_CHANNELS;
 102              i++) {
 103                 flags = req->channels[i]->flags;
 104
 105                 if (!test_bit(i, wl->scan.scanned_ch) &&
 106                     !(flags & IEEE80211_CHAN_DISABLED) &&
 107                     (req->channels[i]->band == band) &&
 108                     /*
 109                      * In passive scans, we scan all remaining
 110                      * channels, even if not marked as such.
 111                      * In active scans, we only scan channels not
 112                      * marked as passive.
 113                      */
 114                     (passive || !(flags & IEEE80211_CHAN_PASSIVE_SCAN))) {
 115                         wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
 116                                      req->channels[i]->band,
 117                                      req->channels[i]->center_freq);
 118                         wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
 119                                      req->channels[i]->hw_value,
 120                                      req->channels[i]->flags);
 121                         wl1271_debug(DEBUG_SCAN,
 122                                      "max_antenna_gain %d, max_power %d",
 123                                      req->channels[i]->max_antenna_gain,
 124                                      req->channels[i]->max_power);
 125                         wl1271_debug(DEBUG_SCAN, "beacon_found %d",
 126                                      req->channels[i]->beacon_found);
 127
 128                         if (!passive) {
 129                                 channels[j].min_duration =
 130                                         cpu_to_le32(c->min_dwell_time_active);
 131                                 channels[j].max_duration =
 132                                         cpu_to_le32(c->max_dwell_time_active);
 133                         } else {
 134                                 channels[j].min_duration =
 135                                         cpu_to_le32(c->min_dwell_time_passive);
 136                                 channels[j].max_duration =
 137                                         cpu_to_le32(c->max_dwell_time_passive);
 138                         }
 139                         channels[j].early_termination = 0;
 140                         channels[j].tx_power_att = req->channels[i]->max_power;
 141                         channels[j].channel = req->channels[i]->hw_value;
 142
 143                         memset(&channels[j].bssid_lsb, 0xff, 4);
 144                         memset(&channels[j].bssid_msb, 0xff, 2);
 145
 146                         /* Mark the channels we already used */
 147                         set_bit(i, wl->scan.scanned_ch);
 148
 149                         j++;
 150                 }
 151         }
 152
 153         return j;
 154 }
 155
 156 #define WL1271_NOTHING_TO_SCAN 1
 157
 158 static int wl1271_scan_send(struct wl1271 *wl, enum ieee80211_band band,
 159                              bool passive, u32 basic_rate)
 160 {
 161         struct wl1271_cmd_scan *cmd;
 162         struct wl1271_cmd_trigger_scan_to *trigger;
 163         int ret;
 164         u16 scan_options = 0;
 165
 166         /* skip active scans if we don't have SSIDs */
 167         if (!passive && wl->scan.req->n_ssids == 0)
 168                 return WL1271_NOTHING_TO_SCAN;
 169
 170         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 171         trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
 172         if (!cmd || !trigger) {
 173                 ret = -ENOMEM;
 174                 goto out;
 175         }
 176
 177         if (passive)
 178                 scan_options |= WL1271_SCAN_OPT_PASSIVE;
 179
 180         if (WARN_ON(wl->role_id == WL12XX_INVALID_ROLE_ID)) {
 181                 ret = -EINVAL;
 182                 goto out;
 183         }
 184         cmd->params.role_id = wl->role_id;
 185         cmd->params.scan_options = cpu_to_le16(scan_options);
 186
 187         cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req,
 188                                                     cmd->channels,
 189                                                     band, passive);
 190         if (cmd->params.n_ch == 0) {
 191                 ret = WL1271_NOTHING_TO_SCAN;
 192                 goto out;
 193         }
 194
 195         cmd->params.tx_rate = cpu_to_le32(basic_rate);
 196         cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs;
 197         cmd->params.tx_rate = cpu_to_le32(basic_rate);
 198         cmd->params.tid_trigger = 0;
 199         cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;
 200
 201         if (band == IEEE80211_BAND_2GHZ)
 202                 cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ;
 203         else
 204                 cmd->params.band = WL1271_SCAN_BAND_5_GHZ;
 205
 206         if (wl->scan.ssid_len && wl->scan.ssid) {
 207                 cmd->params.ssid_len = wl->scan.ssid_len;
 208                 memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len);
 209         }
 210
 211         memcpy(cmd->addr, wl->mac_addr, ETH_ALEN);
 212
 213         ret = wl1271_cmd_build_probe_req(wl, wl->scan.ssid, wl->scan.ssid_len,
 214                                          wl->scan.req->ie, wl->scan.req->ie_len,
 215                                          band);
 216         if (ret < 0) {
 217                 wl1271_error("PROBE request template failed");
 218                 goto out;
 219         }
 220
 221         /* disable the timeout */
 222         trigger->timeout = 0;
 223         ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
 224                               sizeof(*trigger), 0);
 225         if (ret < 0) {
 226                 wl1271_error("trigger scan to failed for hw scan");
 227                 goto out;
 228         }
 229
 230         wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));
 231
 232         ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
 233         if (ret < 0) {
 234                 wl1271_error("SCAN failed");
 235                 goto out;
 236         }
 237
 238 out:
 239         kfree(cmd);
 240         kfree(trigger);
 241         return ret;
 242 }
 243
 244 void wl1271_scan_stm(struct wl1271 *wl)
 245 {
 246         int ret = 0;
 247         enum ieee80211_band band;
 248         u32 rate;
 249
 250         switch (wl->scan.state) {
 251         case WL1271_SCAN_STATE_IDLE:
 252                 break;
 253
 254         case WL1271_SCAN_STATE_2GHZ_ACTIVE:
 255                 band = IEEE80211_BAND_2GHZ;
 256                 rate = wl1271_tx_min_rate_get(wl, wl->bitrate_masks[band]);
 257                 ret = wl1271_scan_send(wl, band, false, rate);
 258                 if (ret == WL1271_NOTHING_TO_SCAN) {
 259                         wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE;
 260                         wl1271_scan_stm(wl);
 261                 }
 262
 263                 break;
 264
 265         case WL1271_SCAN_STATE_2GHZ_PASSIVE:
 266                 band = IEEE80211_BAND_2GHZ;
 267                 rate = wl1271_tx_min_rate_get(wl, wl->bitrate_masks[band]);
 268                 ret = wl1271_scan_send(wl, band, true, rate);
 269                 if (ret == WL1271_NOTHING_TO_SCAN) {
 270                         if (wl->enable_11a)
 271                                 wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE;
 272                         else
 273                                 wl->scan.state = WL1271_SCAN_STATE_DONE;
 274                         wl1271_scan_stm(wl);
 275                 }
 276
 277                 break;
 278
 279         case WL1271_SCAN_STATE_5GHZ_ACTIVE:
 280                 band = IEEE80211_BAND_5GHZ;
 281                 rate = wl1271_tx_min_rate_get(wl, wl->bitrate_masks[band]);
 282                 ret = wl1271_scan_send(wl, band, false, rate);
 283                 if (ret == WL1271_NOTHING_TO_SCAN) {
 284                         wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE;
 285                         wl1271_scan_stm(wl);
 286                 }
 287
 288                 break;
 289
 290         case WL1271_SCAN_STATE_5GHZ_PASSIVE:
 291                 band = IEEE80211_BAND_5GHZ;
 292                 rate = wl1271_tx_min_rate_get(wl, wl->bitrate_masks[band]);
 293                 ret = wl1271_scan_send(wl, band, true, rate);
 294                 if (ret == WL1271_NOTHING_TO_SCAN) {
 295                         wl->scan.state = WL1271_SCAN_STATE_DONE;
 296                         wl1271_scan_stm(wl);
 297                 }
 298
 299                 break;
 300
 301         case WL1271_SCAN_STATE_DONE:
 302                 wl->scan.failed = false;
 303                 cancel_delayed_work(&wl->scan_complete_work);
 304                 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 305                                              msecs_to_jiffies(0));
 306                 break;
 307
 308         default:
 309                 wl1271_error("invalid scan state");
 310                 break;
 311         }
 312
 313         if (ret < 0) {
 314                 cancel_delayed_work(&wl->scan_complete_work);
 315                 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 316                                              msecs_to_jiffies(0));
 317         }
 318 }
 319
 320 int wl1271_scan(struct wl1271 *wl, const u8 *ssid, size_t ssid_len,
 321                 struct cfg80211_scan_request *req)
 322 {
 323         /*
 324          * cfg80211 should guarantee that we don't get more channels
 325          * than what we have registered.
 326          */
 327         BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
 328
 329         if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
 330                 return -EBUSY;
 331
 332         wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
 333
 334         if (ssid_len && ssid) {
 335                 wl->scan.ssid_len = ssid_len;
 336                 memcpy(wl->scan.ssid, ssid, ssid_len);
 337         } else {
 338                 wl->scan.ssid_len = 0;
 339         }
 340
 341         wl->scan.req = req;
 342         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
 343
 344         /* we assume failure so that timeout scenarios are handled correctly */
 345         wl->scan.failed = true;
 346         ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 347                                      msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
 348
 349         wl1271_scan_stm(wl);
 350
 351         return 0;
 352 }
 353
 354 int wl1271_scan_stop(struct wl1271 *wl)
 355 {
 356         struct wl1271_cmd_header *cmd = NULL;
 357         int ret = 0;
 358
 359         if (WARN_ON(wl->scan.state == WL1271_SCAN_STATE_IDLE))
 360                 return -EINVAL;
 361
 362         wl1271_debug(DEBUG_CMD, "cmd scan stop");
 363
 364         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 365         if (!cmd) {
 366                 ret = -ENOMEM;
 367                 goto out;
 368         }
 369
 370         ret = wl1271_cmd_send(wl, CMD_STOP_SCAN, cmd,
 371                               sizeof(*cmd), 0);
 372         if (ret < 0) {
 373                 wl1271_error("cmd stop_scan failed");
 374                 goto out;
 375         }
 376 out:
 377         kfree(cmd);
 378         return ret;
 379 }
 380
 381 static int
 382 wl1271_scan_get_sched_scan_channels(struct wl1271 *wl,
 383                                     struct cfg80211_sched_scan_request *req,
 384                                     struct conn_scan_ch_params *channels,
 385                                     u32 band, bool radar, bool passive,
 386                                     int start, int max_channels)
 387 {
 388         struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 389         int i, j;
 390         u32 flags;
 391         bool force_passive = !req->n_ssids;
 392
 393         for (i = 0, j = start;
 394              i < req->n_channels && j < max_channels;
 395              i++) {
 396                 flags = req->channels[i]->flags;
 397
 398                 if (force_passive)
 399                         flags |= IEEE80211_CHAN_PASSIVE_SCAN;
 400
 401                 if ((req->channels[i]->band == band) &&
 402                     !(flags & IEEE80211_CHAN_DISABLED) &&
 403                     (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
 404                     /* if radar is set, we ignore the passive flag */
 405                     (radar ||
 406                      !!(flags & IEEE80211_CHAN_PASSIVE_SCAN) == passive)) {
 407                         wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
 408                                      req->channels[i]->band,
 409                                      req->channels[i]->center_freq);
 410                         wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
 411                                      req->channels[i]->hw_value,
 412                                      req->channels[i]->flags);
 413                         wl1271_debug(DEBUG_SCAN, "max_power %d",
 414                                      req->channels[i]->max_power);
 415
 416                         if (flags & IEEE80211_CHAN_RADAR) {
 417                                 channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
 418                                 channels[j].passive_duration =
 419                                         cpu_to_le16(c->dwell_time_dfs);
 420                         }
 421                         else if (flags & IEEE80211_CHAN_PASSIVE_SCAN) {
 422                                 channels[j].passive_duration =
 423                                         cpu_to_le16(c->dwell_time_passive);
 424                         } else {
 425                                 channels[j].min_duration =
 426                                         cpu_to_le16(c->min_dwell_time_active);
 427                                 channels[j].max_duration =
 428                                         cpu_to_le16(c->max_dwell_time_active);
 429                         }
 430                         channels[j].tx_power_att = req->channels[i]->max_power;
 431                         channels[j].channel = req->channels[i]->hw_value;
 432
 433                         j++;
 434                 }
 435         }
 436
 437         return j - start;
 438 }
 439
 440 static bool
 441 wl1271_scan_sched_scan_channels(struct wl1271 *wl,
 442                                 struct cfg80211_sched_scan_request *req,
 443                                 struct wl1271_cmd_sched_scan_config *cfg)
 444 {
 445         cfg->passive[0] =
 446                 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_2,
 447                                                     IEEE80211_BAND_2GHZ,
 448                                                     false, true, 0,
 449                                                     MAX_CHANNELS_2GHZ);
 450         cfg->active[0] =
 451                 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_2,
 452                                                     IEEE80211_BAND_2GHZ,
 453                                                     false, false,
 454                                                     cfg->passive[0],
 455                                                     MAX_CHANNELS_2GHZ);
 456         cfg->passive[1] =
 457                 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_5,
 458                                                     IEEE80211_BAND_5GHZ,
 459                                                     false, true, 0,
 460                                                     MAX_CHANNELS_5GHZ);
 461         cfg->dfs =
 462                 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_5,
 463                                                     IEEE80211_BAND_5GHZ,
 464                                                     true, true,
 465                                                     cfg->passive[1],
 466                                                     MAX_CHANNELS_5GHZ);
 467         cfg->active[1] =
 468                 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_5,
 469                                                     IEEE80211_BAND_5GHZ,
 470                                                     false, false,
 471                                                     cfg->passive[1] + cfg->dfs,
 472                                                     MAX_CHANNELS_5GHZ);
 473         /* 802.11j channels are not supported yet */
 474         cfg->passive[2] = 0;
 475         cfg->active[2] = 0;
 476
 477         wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
 478                      cfg->active[0], cfg->passive[0]);
 479         wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
 480                      cfg->active[1], cfg->passive[1]);
 481         wl1271_debug(DEBUG_SCAN, "    DFS: %d", cfg->dfs);
 482
 483         return  cfg->passive[0] || cfg->active[0] ||
 484                 cfg->passive[1] || cfg->active[1] || cfg->dfs ||
 485                 cfg->passive[2] || cfg->active[2];
 486 }
 487
 488 /* Returns the scan type to be used or a negative value on error */
 489 static int
 490 wl12xx_scan_sched_scan_ssid_list(struct wl1271 *wl,
 491                                  struct cfg80211_sched_scan_request *req)
 492 {
 493         struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
 494         struct cfg80211_match_set *sets = req->match_sets;
 495         struct cfg80211_ssid *ssids = req->ssids;
 496         int ret = 0, type, i, j, n_match_ssids = 0;
 497
 498         wl1271_debug(DEBUG_CMD, "cmd sched scan ssid list");
 499
 500         /* count the match sets that contain SSIDs */
 501         for (i = 0; i < req->n_match_sets; i++)
 502                 if (sets[i].ssid.ssid_len > 0)
 503                         n_match_ssids++;
 504
 505         /* No filter, no ssids or only bcast ssid */
 506         if (!n_match_ssids &&
 507             (!req->n_ssids ||
 508              (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
 509                 type = SCAN_SSID_FILTER_ANY;
 510                 goto out;
 511         }
 512
 513         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 514         if (!cmd) {
 515                 ret = -ENOMEM;
 516                 goto out;
 517         }
 518
 519         if (!n_match_ssids) {
 520                 /* No filter, with ssids */
 521                 type = SCAN_SSID_FILTER_DISABLED;
 522
 523                 for (i = 0; i < req->n_ssids; i++) {
 524                         cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
 525                                 SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
 526                         cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
 527                         memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
 528                                ssids[i].ssid_len);
 529                         cmd->n_ssids++;
 530                 }
 531         } else {
 532                 type = SCAN_SSID_FILTER_LIST;
 533
 534                 /* Add all SSIDs from the filters */
 535                 for (i = 0; i < req->n_match_sets; i++) {
 536                         /* ignore sets without SSIDs */
 537                         if (!sets[i].ssid.ssid_len)
 538                                 continue;
 539
 540                         cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
 541                         cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
 542                         memcpy(cmd->ssids[cmd->n_ssids].ssid,
 543                                sets[i].ssid.ssid, sets[i].ssid.ssid_len);
 544                         cmd->n_ssids++;
 545                 }
 546                 if ((req->n_ssids > 1) ||
 547                     (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
 548                         /*
 549                          * Mark all the SSIDs passed in the SSID list as HIDDEN,
 550                          * so they're used in probe requests.
 551                          */
 552                         for (i = 0; i < req->n_ssids; i++) {
 553                                 for (j = 0; j < cmd->n_ssids; j++)
 554                                         if (!memcmp(req->ssids[i].ssid,
 555                                                    cmd->ssids[j].ssid,
 556                                                    req->ssids[i].ssid_len)) {
 557                                                 cmd->ssids[j].type =
 558                                                         SCAN_SSID_TYPE_HIDDEN;
 559                                                 break;
 560                                         }
 561                                 /* Fail if SSID isn't present in the filters */
 562                                 if (j == cmd->n_ssids) {
 563                                         ret = -EINVAL;
 564                                         goto out_free;
 565                                 }
 566                         }
 567                 }
 568         }
 569
 570         wl1271_dump(DEBUG_SCAN, "SSID_LIST: ", cmd, sizeof(*cmd));
 571
 572         ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
 573                               sizeof(*cmd), 0);
 574         if (ret < 0) {
 575                 wl1271_error("cmd sched scan ssid list failed");
 576                 goto out_free;
 577         }
 578
 579 out_free:
 580         kfree(cmd);
 581 out:
 582         if (ret < 0)
 583                 return ret;
 584         return type;
 585 }
 586
 587 int wl1271_scan_sched_scan_config(struct wl1271 *wl,
 588                                   struct cfg80211_sched_scan_request *req,
 589                                   struct ieee80211_sched_scan_ies *ies)
 590 {
 591         struct wl1271_cmd_sched_scan_config *cfg = NULL;
 592         struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 593         int i, ret;
 594         bool force_passive = !req->n_ssids;
 595
 596         wl1271_debug(DEBUG_CMD, "cmd sched_scan scan config");
 597
 598         cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
 599         if (!cfg)
 600                 return -ENOMEM;
 601
 602         cfg->rssi_threshold = c->rssi_threshold;
 603         cfg->snr_threshold  = c->snr_threshold;
 604         cfg->n_probe_reqs = c->num_probe_reqs;
 605         /* cycles set to 0 it means infinite (until manually stopped) */
 606         cfg->cycles = 0;
 607         /* report APs when at least 1 is found */
 608         cfg->report_after = 1;
 609         /* don't stop scanning automatically when something is found */
 610         cfg->terminate = 0;
 611         cfg->tag = WL1271_SCAN_DEFAULT_TAG;
 612         /* don't filter on BSS type */
 613         cfg->bss_type = SCAN_BSS_TYPE_ANY;
 614         /* currently NL80211 supports only a single interval */
 615         for (i = 0; i < SCAN_MAX_CYCLE_INTERVALS; i++)
 616                 cfg->intervals[i] = cpu_to_le32(req->interval);
 617
 618         cfg->ssid_len = 0;
 619         ret = wl12xx_scan_sched_scan_ssid_list(wl, req);
 620         if (ret < 0)
 621                 goto out;
 622
 623         cfg->filter_type = ret;
 624
 625         wl1271_debug(DEBUG_SCAN, "filter_type = %d", cfg->filter_type);
 626
 627         if (!wl1271_scan_sched_scan_channels(wl, req, cfg)) {
 628                 wl1271_error("scan channel list is empty");
 629                 ret = -EINVAL;
 630                 goto out;
 631         }
 632
 633         if (!force_passive && cfg->active[0]) {
 634                 ret = wl1271_cmd_build_probe_req(wl, req->ssids[0].ssid,
 635                                                  req->ssids[0].ssid_len,
 636                                                  ies->ie[IEEE80211_BAND_2GHZ],
 637                                                  ies->len[IEEE80211_BAND_2GHZ],
 638                                                  IEEE80211_BAND_2GHZ);
 639                 if (ret < 0) {
 640                         wl1271_error("2.4GHz PROBE request template failed");
 641                         goto out;
 642                 }
 643         }
 644
 645         if (!force_passive && cfg->active[1]) {
 646                 ret = wl1271_cmd_build_probe_req(wl,  req->ssids[0].ssid,
 647                                                  req->ssids[0].ssid_len,
 648                                                  ies->ie[IEEE80211_BAND_5GHZ],
 649                                                  ies->len[IEEE80211_BAND_5GHZ],
 650                                                  IEEE80211_BAND_5GHZ);
 651                 if (ret < 0) {
 652                         wl1271_error("5GHz PROBE request template failed");
 653                         goto out;
 654                 }
 655         }
 656
 657         wl1271_dump(DEBUG_SCAN, "SCAN_CFG: ", cfg, sizeof(*cfg));
 658
 659         ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_CFG, cfg,
 660                               sizeof(*cfg), 0);
 661         if (ret < 0) {
 662                 wl1271_error("SCAN configuration failed");
 663                 goto out;
 664         }
 665 out:
 666         kfree(cfg);
 667         return ret;
 668 }
 669
 670 int wl1271_scan_sched_scan_start(struct wl1271 *wl)
 671 {
 672         struct wl1271_cmd_sched_scan_start *start;
 673         int ret = 0;
 674
 675         wl1271_debug(DEBUG_CMD, "cmd periodic scan start");
 676
 677         if (wl->bss_type != BSS_TYPE_STA_BSS)
 678                 return -EOPNOTSUPP;
 679
 680         if (!test_bit(WL1271_FLAG_IDLE, &wl->flags))
 681                 return -EBUSY;
 682
 683         start = kzalloc(sizeof(*start), GFP_KERNEL);
 684         if (!start)
 685                 return -ENOMEM;
 686
 687         start->tag = WL1271_SCAN_DEFAULT_TAG;
 688
 689         ret = wl1271_cmd_send(wl, CMD_START_PERIODIC_SCAN, start,
 690                               sizeof(*start), 0);
 691         if (ret < 0) {
 692                 wl1271_error("failed to send scan start command");
 693                 goto out_free;
 694         }
 695
 696 out_free:
 697         kfree(start);
 698         return ret;
 699 }
 700
 701 void wl1271_scan_sched_scan_results(struct wl1271 *wl)
 702 {
 703         wl1271_debug(DEBUG_SCAN, "got periodic scan results");
 704
 705         ieee80211_sched_scan_results(wl->hw);
 706 }
 707
 708 void wl1271_scan_sched_scan_stop(struct wl1271 *wl)
 709 {
 710         struct wl1271_cmd_sched_scan_stop *stop;
 711         int ret = 0;
 712
 713         wl1271_debug(DEBUG_CMD, "cmd periodic scan stop");
 714
 715         /* FIXME: what to do if alloc'ing to stop fails? */
 716         stop = kzalloc(sizeof(*stop), GFP_KERNEL);
 717         if (!stop) {
 718                 wl1271_error("failed to alloc memory to send sched scan stop");
 719                 return;
 720         }
 721
 722         stop->tag = WL1271_SCAN_DEFAULT_TAG;
 723
 724         ret = wl1271_cmd_send(wl, CMD_STOP_PERIODIC_SCAN, stop,
 725                               sizeof(*stop), 0);
 726         if (ret < 0) {
 727                 wl1271_error("failed to send sched scan stop command");
 728                 goto out_free;
 729         }
 730         wl->sched_scanning = false;
 731
 732 out_free:
 733         kfree(stop);
 734 }