drivers/net/wireless/ti/wlcore/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 "wlcore.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
  42         dwork = container_of(work, struct delayed_work, work);
  43         wl = container_of(dwork, struct wl1271, scan_complete_work);
  44
  45         wl1271_debug(DEBUG_SCAN, "Scanning complete");
  46
  47         mutex_lock(&wl->mutex);
  48
  49         if (wl->state == WL1271_STATE_OFF)
  50                 goto out;
  51
  52         if (wl->scan.state == WL1271_SCAN_STATE_IDLE)
  53                 goto out;
  54
  55         vif = wl->scan_vif;
  56         wlvif = wl12xx_vif_to_data(vif);
  57
  58         /*
  59          * Rearm the tx watchdog just before idling scan. This
  60          * prevents just-finished scans from triggering the watchdog
  61          */
  62         wl12xx_rearm_tx_watchdog_locked(wl);
  63
  64         wl->scan.state = WL1271_SCAN_STATE_IDLE;
  65         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
  66         wl->scan.req = NULL;
  67         wl->scan_vif = NULL;
  68
  69         ret = wl1271_ps_elp_wakeup(wl);
  70         if (ret < 0)
  71                 goto out;
  72
  73         if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags)) {
  74                 /* restore hardware connection monitoring template */
  75                 wl1271_cmd_build_ap_probe_req(wl, wlvif, wlvif->probereq);
  76         }
  77
  78         wl1271_ps_elp_sleep(wl);
  79
  80         if (wl->scan.failed) {
  81                 wl1271_info("Scan completed due to error.");
  82                 wl12xx_queue_recovery_work(wl);
  83         }
  84
  85         ieee80211_scan_completed(wl->hw, false);
  86
  87 out:
  88         mutex_unlock(&wl->mutex);
  89
  90 }
  91
  92
  93 static int wl1271_get_scan_channels(struct wl1271 *wl,
  94                                     struct cfg80211_scan_request *req,
  95                                     struct basic_scan_channel_params *channels,
  96                                     enum ieee80211_band band, bool passive)
  97 {
  98         struct conf_scan_settings *c = &wl->conf.scan;
  99         int i, j;
 100         u32 flags;
 101
 102         for (i = 0, j = 0;
 103              i < req->n_channels && j < WL1271_SCAN_MAX_CHANNELS;
 104              i++) {
 105                 flags = req->channels[i]->flags;
 106
 107                 if (!test_bit(i, wl->scan.scanned_ch) &&
 108                     !(flags & IEEE80211_CHAN_DISABLED) &&
 109                     (req->channels[i]->band == band) &&
 110                     /*
 111                      * In passive scans, we scan all remaining
 112                      * channels, even if not marked as such.
 113                      * In active scans, we only scan channels not
 114                      * marked as passive.
 115                      */
 116                     (passive || !(flags & IEEE80211_CHAN_PASSIVE_SCAN))) {
 117                         wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
 118                                      req->channels[i]->band,
 119                                      req->channels[i]->center_freq);
 120                         wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
 121                                      req->channels[i]->hw_value,
 122                                      req->channels[i]->flags);
 123                         wl1271_debug(DEBUG_SCAN,
 124                                      "max_antenna_gain %d, max_power %d",
 125                                      req->channels[i]->max_antenna_gain,
 126                                      req->channels[i]->max_power);
 127                         wl1271_debug(DEBUG_SCAN, "beacon_found %d",
 128                                      req->channels[i]->beacon_found);
 129
 130                         if (!passive) {
 131                                 channels[j].min_duration =
 132                                         cpu_to_le32(c->min_dwell_time_active);
 133                                 channels[j].max_duration =
 134                                         cpu_to_le32(c->max_dwell_time_active);
 135                         } else {
 136                                 channels[j].min_duration =
 137                                         cpu_to_le32(c->min_dwell_time_passive);
 138                                 channels[j].max_duration =
 139                                         cpu_to_le32(c->max_dwell_time_passive);
 140                         }
 141                         channels[j].early_termination = 0;
 142                         channels[j].tx_power_att = req->channels[i]->max_power;
 143                         channels[j].channel = req->channels[i]->hw_value;
 144
 145                         memset(&channels[j].bssid_lsb, 0xff, 4);
 146                         memset(&channels[j].bssid_msb, 0xff, 2);
 147
 148                         /* Mark the channels we already used */
 149                         set_bit(i, wl->scan.scanned_ch);
 150
 151                         j++;
 152                 }
 153         }
 154
 155         return j;
 156 }
 157
 158 #define WL1271_NOTHING_TO_SCAN 1
 159
 160 static int wl1271_scan_send(struct wl1271 *wl, struct ieee80211_vif *vif,
 161                             enum ieee80211_band band,
 162                             bool passive, u32 basic_rate)
 163 {
 164         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 165         struct wl1271_cmd_scan *cmd;
 166         struct wl1271_cmd_trigger_scan_to *trigger;
 167         int ret;
 168         u16 scan_options = 0;
 169
 170         /* skip active scans if we don't have SSIDs */
 171         if (!passive && wl->scan.req->n_ssids == 0)
 172                 return WL1271_NOTHING_TO_SCAN;
 173
 174         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 175         trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
 176         if (!cmd || !trigger) {
 177                 ret = -ENOMEM;
 178                 goto out;
 179         }
 180
 181         if (wl->conf.scan.split_scan_timeout)
 182                 scan_options |= WL1271_SCAN_OPT_SPLIT_SCAN;
 183
 184         if (passive)
 185                 scan_options |= WL1271_SCAN_OPT_PASSIVE;
 186
 187         if (wlvif->bss_type == BSS_TYPE_AP_BSS ||
 188             test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags))
 189                 cmd->params.role_id = wlvif->role_id;
 190         else
 191                 cmd->params.role_id = wlvif->dev_role_id;
 192
 193         if (WARN_ON(cmd->params.role_id == WL12XX_INVALID_ROLE_ID)) {
 194                 ret = -EINVAL;
 195                 goto out;
 196         }
 197
 198         cmd->params.scan_options = cpu_to_le16(scan_options);
 199
 200         cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req,
 201                                                     cmd->channels,
 202                                                     band, passive);
 203         if (cmd->params.n_ch == 0) {
 204                 ret = WL1271_NOTHING_TO_SCAN;
 205                 goto out;
 206         }
 207
 208         cmd->params.tx_rate = cpu_to_le32(basic_rate);
 209         cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs;
 210         cmd->params.tid_trigger = CONF_TX_AC_ANY_TID;
 211         cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;
 212
 213         if (band == IEEE80211_BAND_2GHZ)
 214                 cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ;
 215         else
 216                 cmd->params.band = WL1271_SCAN_BAND_5_GHZ;
 217
 218         if (wl->scan.ssid_len && wl->scan.ssid) {
 219                 cmd->params.ssid_len = wl->scan.ssid_len;
 220                 memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len);
 221         }
 222
 223         memcpy(cmd->addr, vif->addr, ETH_ALEN);
 224
 225         ret = wl12xx_cmd_build_probe_req(wl, wlvif,
 226                                          cmd->params.role_id, band,
 227                                          wl->scan.ssid, wl->scan.ssid_len,
 228                                          wl->scan.req->ie,
 229                                          wl->scan.req->ie_len, false);
 230         if (ret < 0) {
 231                 wl1271_error("PROBE request template failed");
 232                 goto out;
 233         }
 234
 235         trigger->timeout = cpu_to_le32(wl->conf.scan.split_scan_timeout);
 236         ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
 237                               sizeof(*trigger), 0);
 238         if (ret < 0) {
 239                 wl1271_error("trigger scan to failed for hw scan");
 240                 goto out;
 241         }
 242
 243         wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));
 244
 245         ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
 246         if (ret < 0) {
 247                 wl1271_error("SCAN failed");
 248                 goto out;
 249         }
 250
 251 out:
 252         kfree(cmd);
 253         kfree(trigger);
 254         return ret;
 255 }
 256
 257 void wl1271_scan_stm(struct wl1271 *wl, struct ieee80211_vif *vif)
 258 {
 259         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 260         int ret = 0;
 261         enum ieee80211_band band;
 262         u32 rate, mask;
 263
 264         switch (wl->scan.state) {
 265         case WL1271_SCAN_STATE_IDLE:
 266                 break;
 267
 268         case WL1271_SCAN_STATE_2GHZ_ACTIVE:
 269                 band = IEEE80211_BAND_2GHZ;
 270                 mask = wlvif->bitrate_masks[band];
 271                 if (wl->scan.req->no_cck) {
 272                         mask &= ~CONF_TX_CCK_RATES;
 273                         if (!mask)
 274                                 mask = CONF_TX_RATE_MASK_BASIC_P2P;
 275                 }
 276                 rate = wl1271_tx_min_rate_get(wl, mask);
 277                 ret = wl1271_scan_send(wl, vif, band, false, rate);
 278                 if (ret == WL1271_NOTHING_TO_SCAN) {
 279                         wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE;
 280                         wl1271_scan_stm(wl, vif);
 281                 }
 282
 283                 break;
 284
 285         case WL1271_SCAN_STATE_2GHZ_PASSIVE:
 286                 band = IEEE80211_BAND_2GHZ;
 287                 mask = wlvif->bitrate_masks[band];
 288                 if (wl->scan.req->no_cck) {
 289                         mask &= ~CONF_TX_CCK_RATES;
 290                         if (!mask)
 291                                 mask = CONF_TX_RATE_MASK_BASIC_P2P;
 292                 }
 293                 rate = wl1271_tx_min_rate_get(wl, mask);
 294                 ret = wl1271_scan_send(wl, vif, band, true, rate);
 295                 if (ret == WL1271_NOTHING_TO_SCAN) {
 296                         if (wl->enable_11a)
 297                                 wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE;
 298                         else
 299                                 wl->scan.state = WL1271_SCAN_STATE_DONE;
 300                         wl1271_scan_stm(wl, vif);
 301                 }
 302
 303                 break;
 304
 305         case WL1271_SCAN_STATE_5GHZ_ACTIVE:
 306                 band = IEEE80211_BAND_5GHZ;
 307                 rate = wl1271_tx_min_rate_get(wl, wlvif->bitrate_masks[band]);
 308                 ret = wl1271_scan_send(wl, vif, band, false, rate);
 309                 if (ret == WL1271_NOTHING_TO_SCAN) {
 310                         wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE;
 311                         wl1271_scan_stm(wl, vif);
 312                 }
 313
 314                 break;
 315
 316         case WL1271_SCAN_STATE_5GHZ_PASSIVE:
 317                 band = IEEE80211_BAND_5GHZ;
 318                 rate = wl1271_tx_min_rate_get(wl, wlvif->bitrate_masks[band]);
 319                 ret = wl1271_scan_send(wl, vif, band, true, rate);
 320                 if (ret == WL1271_NOTHING_TO_SCAN) {
 321                         wl->scan.state = WL1271_SCAN_STATE_DONE;
 322                         wl1271_scan_stm(wl, vif);
 323                 }
 324
 325                 break;
 326
 327         case WL1271_SCAN_STATE_DONE:
 328                 wl->scan.failed = false;
 329                 cancel_delayed_work(&wl->scan_complete_work);
 330                 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 331                                              msecs_to_jiffies(0));
 332                 break;
 333
 334         default:
 335                 wl1271_error("invalid scan state");
 336                 break;
 337         }
 338
 339         if (ret < 0) {
 340                 cancel_delayed_work(&wl->scan_complete_work);
 341                 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 342                                              msecs_to_jiffies(0));
 343         }
 344 }
 345
 346 int wl1271_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
 347                 const u8 *ssid, size_t ssid_len,
 348                 struct cfg80211_scan_request *req)
 349 {
 350         /*
 351          * cfg80211 should guarantee that we don't get more channels
 352          * than what we have registered.
 353          */
 354         BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
 355
 356         if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
 357                 return -EBUSY;
 358
 359         wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
 360
 361         if (ssid_len && ssid) {
 362                 wl->scan.ssid_len = ssid_len;
 363                 memcpy(wl->scan.ssid, ssid, ssid_len);
 364         } else {
 365                 wl->scan.ssid_len = 0;
 366         }
 367
 368         wl->scan_vif = vif;
 369         wl->scan.req = req;
 370         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
 371
 372         /* we assume failure so that timeout scenarios are handled correctly */
 373         wl->scan.failed = true;
 374         ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 375                                      msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
 376
 377         wl1271_scan_stm(wl, vif);
 378
 379         return 0;
 380 }
 381
 382 int wl1271_scan_stop(struct wl1271 *wl)
 383 {
 384         struct wl1271_cmd_header *cmd = NULL;
 385         int ret = 0;
 386
 387         if (WARN_ON(wl->scan.state == WL1271_SCAN_STATE_IDLE))
 388                 return -EINVAL;
 389
 390         wl1271_debug(DEBUG_CMD, "cmd scan stop");
 391
 392         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 393         if (!cmd) {
 394                 ret = -ENOMEM;
 395                 goto out;
 396         }
 397
 398         ret = wl1271_cmd_send(wl, CMD_STOP_SCAN, cmd,
 399                               sizeof(*cmd), 0);
 400         if (ret < 0) {
 401                 wl1271_error("cmd stop_scan failed");
 402                 goto out;
 403         }
 404 out:
 405         kfree(cmd);
 406         return ret;
 407 }
 408
 409 static int
 410 wl1271_scan_get_sched_scan_channels(struct wl1271 *wl,
 411                                     struct cfg80211_sched_scan_request *req,
 412                                     struct conn_scan_ch_params *channels,
 413                                     u32 band, bool radar, bool passive,
 414                                     int start, int max_channels,
 415                                     u8 *n_pactive_ch)
 416 {
 417         struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 418         int i, j;
 419         u32 flags;
 420         bool force_passive = !req->n_ssids;
 421         u32 min_dwell_time_active, max_dwell_time_active, delta_per_probe;
 422         u32 dwell_time_passive, dwell_time_dfs;
 423
 424         if (band == IEEE80211_BAND_5GHZ)
 425                 delta_per_probe = c->dwell_time_delta_per_probe_5;
 426         else
 427                 delta_per_probe = c->dwell_time_delta_per_probe;
 428
 429         min_dwell_time_active = c->base_dwell_time +
 430                  req->n_ssids * c->num_probe_reqs * delta_per_probe;
 431
 432         max_dwell_time_active = min_dwell_time_active + c->max_dwell_time_delta;
 433
 434         min_dwell_time_active = DIV_ROUND_UP(min_dwell_time_active, 1000);
 435         max_dwell_time_active = DIV_ROUND_UP(max_dwell_time_active, 1000);
 436         dwell_time_passive = DIV_ROUND_UP(c->dwell_time_passive, 1000);
 437         dwell_time_dfs = DIV_ROUND_UP(c->dwell_time_dfs, 1000);
 438
 439         for (i = 0, j = start;
 440              i < req->n_channels && j < max_channels;
 441              i++) {
 442                 flags = req->channels[i]->flags;
 443
 444                 if (force_passive)
 445                         flags |= IEEE80211_CHAN_PASSIVE_SCAN;
 446
 447                 if ((req->channels[i]->band == band) &&
 448                     !(flags & IEEE80211_CHAN_DISABLED) &&
 449                     (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
 450                     /* if radar is set, we ignore the passive flag */
 451                     (radar ||
 452                      !!(flags & IEEE80211_CHAN_PASSIVE_SCAN) == passive)) {
 453                         wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
 454                                      req->channels[i]->band,
 455                                      req->channels[i]->center_freq);
 456                         wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
 457                                      req->channels[i]->hw_value,
 458                                      req->channels[i]->flags);
 459                         wl1271_debug(DEBUG_SCAN, "max_power %d",
 460                                      req->channels[i]->max_power);
 461                         wl1271_debug(DEBUG_SCAN, "min_dwell_time %d max dwell time %d",
 462                                      min_dwell_time_active,
 463                                      max_dwell_time_active);
 464
 465                         if (flags & IEEE80211_CHAN_RADAR) {
 466                                 channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
 467
 468                                 channels[j].passive_duration =
 469                                         cpu_to_le16(dwell_time_dfs);
 470                         } else {
 471                                 channels[j].passive_duration =
 472                                         cpu_to_le16(dwell_time_passive);
 473                         }
 474
 475                         channels[j].min_duration =
 476                                 cpu_to_le16(min_dwell_time_active);
 477                         channels[j].max_duration =
 478                                 cpu_to_le16(max_dwell_time_active);
 479
 480                         channels[j].tx_power_att = req->channels[i]->max_power;
 481                         channels[j].channel = req->channels[i]->hw_value;
 482
 483                         if ((band == IEEE80211_BAND_2GHZ) &&
 484                             (channels[j].channel >= 12) &&
 485                             (channels[j].channel <= 14) &&
 486                             (flags & IEEE80211_CHAN_PASSIVE_SCAN) &&
 487                             !force_passive) {
 488                                 /* pactive channels treated as DFS */
 489                                 channels[j].flags = SCAN_CHANNEL_FLAGS_DFS;
 490
 491                                 /*
 492                                  * n_pactive_ch is counted down from the end of
 493                                  * the passive channel list
 494                                  */
 495                                 (*n_pactive_ch)++;
 496                                 wl1271_debug(DEBUG_SCAN, "n_pactive_ch = %d",
 497                                              *n_pactive_ch);
 498                         }
 499
 500                         j++;
 501                 }
 502         }
 503
 504         return j - start;
 505 }
 506
 507 static bool
 508 wl1271_scan_sched_scan_channels(struct wl1271 *wl,
 509                                 struct cfg80211_sched_scan_request *req,
 510                                 struct wl1271_cmd_sched_scan_config *cfg)
 511 {
 512         u8 n_pactive_ch = 0;
 513
 514         cfg->passive[0] =
 515                 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_2,
 516                                                     IEEE80211_BAND_2GHZ,
 517                                                     false, true, 0,
 518                                                     MAX_CHANNELS_2GHZ,
 519                                                     &n_pactive_ch);
 520         cfg->active[0] =
 521                 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_2,
 522                                                     IEEE80211_BAND_2GHZ,
 523                                                     false, false,
 524                                                     cfg->passive[0],
 525                                                     MAX_CHANNELS_2GHZ,
 526                                                     &n_pactive_ch);
 527         cfg->passive[1] =
 528                 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_5,
 529                                                     IEEE80211_BAND_5GHZ,
 530                                                     false, true, 0,
 531                                                     MAX_CHANNELS_5GHZ,
 532                                                     &n_pactive_ch);
 533         cfg->dfs =
 534                 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_5,
 535                                                     IEEE80211_BAND_5GHZ,
 536                                                     true, true,
 537                                                     cfg->passive[1],
 538                                                     MAX_CHANNELS_5GHZ,
 539                                                     &n_pactive_ch);
 540         cfg->active[1] =
 541                 wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels_5,
 542                                                     IEEE80211_BAND_5GHZ,
 543                                                     false, false,
 544                                                     cfg->passive[1] + cfg->dfs,
 545                                                     MAX_CHANNELS_5GHZ,
 546                                                     &n_pactive_ch);
 547         /* 802.11j channels are not supported yet */
 548         cfg->passive[2] = 0;
 549         cfg->active[2] = 0;
 550
 551         cfg->n_pactive_ch = n_pactive_ch;
 552
 553         wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
 554                      cfg->active[0], cfg->passive[0]);
 555         wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
 556                      cfg->active[1], cfg->passive[1]);
 557         wl1271_debug(DEBUG_SCAN, "    DFS: %d", cfg->dfs);
 558
 559         return  cfg->passive[0] || cfg->active[0] ||
 560                 cfg->passive[1] || cfg->active[1] || cfg->dfs ||
 561                 cfg->passive[2] || cfg->active[2];
 562 }
 563
 564 /* Returns the scan type to be used or a negative value on error */
 565 static int
 566 wl12xx_scan_sched_scan_ssid_list(struct wl1271 *wl,
 567                                  struct wl12xx_vif *wlvif,
 568                                  struct cfg80211_sched_scan_request *req)
 569 {
 570         struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
 571         struct cfg80211_match_set *sets = req->match_sets;
 572         struct cfg80211_ssid *ssids = req->ssids;
 573         int ret = 0, type, i, j, n_match_ssids = 0;
 574
 575         wl1271_debug(DEBUG_CMD, "cmd sched scan ssid list");
 576
 577         /* count the match sets that contain SSIDs */
 578         for (i = 0; i < req->n_match_sets; i++)
 579                 if (sets[i].ssid.ssid_len > 0)
 580                         n_match_ssids++;
 581
 582         /* No filter, no ssids or only bcast ssid */
 583         if (!n_match_ssids &&
 584             (!req->n_ssids ||
 585              (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
 586                 type = SCAN_SSID_FILTER_ANY;
 587                 goto out;
 588         }
 589
 590         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 591         if (!cmd) {
 592                 ret = -ENOMEM;
 593                 goto out;
 594         }
 595
 596         cmd->role_id = wlvif->dev_role_id;
 597         if (!n_match_ssids) {
 598                 /* No filter, with ssids */
 599                 type = SCAN_SSID_FILTER_DISABLED;
 600
 601                 for (i = 0; i < req->n_ssids; i++) {
 602                         cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
 603                                 SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
 604                         cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
 605                         memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
 606                                ssids[i].ssid_len);
 607                         cmd->n_ssids++;
 608                 }
 609         } else {
 610                 type = SCAN_SSID_FILTER_LIST;
 611
 612                 /* Add all SSIDs from the filters */
 613                 for (i = 0; i < req->n_match_sets; i++) {
 614                         /* ignore sets without SSIDs */
 615                         if (!sets[i].ssid.ssid_len)
 616                                 continue;
 617
 618                         cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
 619                         cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
 620                         memcpy(cmd->ssids[cmd->n_ssids].ssid,
 621                                sets[i].ssid.ssid, sets[i].ssid.ssid_len);
 622                         cmd->n_ssids++;
 623                 }
 624                 if ((req->n_ssids > 1) ||
 625                     (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
 626                         /*
 627                          * Mark all the SSIDs passed in the SSID list as HIDDEN,
 628                          * so they're used in probe requests.
 629                          */
 630                         for (i = 0; i < req->n_ssids; i++) {
 631                                 if (!req->ssids[i].ssid_len)
 632                                         continue;
 633
 634                                 for (j = 0; j < cmd->n_ssids; j++)
 635                                         if ((req->ssids[i].ssid_len ==
 636                                              cmd->ssids[j].len) &&
 637                                             !memcmp(req->ssids[i].ssid,
 638                                                    cmd->ssids[j].ssid,
 639                                                    req->ssids[i].ssid_len)) {
 640                                                 cmd->ssids[j].type =
 641                                                         SCAN_SSID_TYPE_HIDDEN;
 642                                                 break;
 643                                         }
 644                                 /* Fail if SSID isn't present in the filters */
 645                                 if (j == cmd->n_ssids) {
 646                                         ret = -EINVAL;
 647                                         goto out_free;
 648                                 }
 649                         }
 650                 }
 651         }
 652
 653         wl1271_dump(DEBUG_SCAN, "SSID_LIST: ", cmd, sizeof(*cmd));
 654
 655         ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
 656                               sizeof(*cmd), 0);
 657         if (ret < 0) {
 658                 wl1271_error("cmd sched scan ssid list failed");
 659                 goto out_free;
 660         }
 661
 662 out_free:
 663         kfree(cmd);
 664 out:
 665         if (ret < 0)
 666                 return ret;
 667         return type;
 668 }
 669
 670 int wl1271_scan_sched_scan_config(struct wl1271 *wl,
 671                                   struct wl12xx_vif *wlvif,
 672                                   struct cfg80211_sched_scan_request *req,
 673                                   struct ieee80211_sched_scan_ies *ies)
 674 {
 675         struct wl1271_cmd_sched_scan_config *cfg = NULL;
 676         struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 677         int i, ret;
 678         bool force_passive = !req->n_ssids;
 679
 680         wl1271_debug(DEBUG_CMD, "cmd sched_scan scan config");
 681
 682         cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
 683         if (!cfg)
 684                 return -ENOMEM;
 685
 686         cfg->role_id = wlvif->dev_role_id;
 687         cfg->rssi_threshold = c->rssi_threshold;
 688         cfg->snr_threshold  = c->snr_threshold;
 689         cfg->n_probe_reqs = c->num_probe_reqs;
 690         /* cycles set to 0 it means infinite (until manually stopped) */
 691         cfg->cycles = 0;
 692         /* report APs when at least 1 is found */
 693         cfg->report_after = 1;
 694         /* don't stop scanning automatically when something is found */
 695         cfg->terminate = 0;
 696         cfg->tag = WL1271_SCAN_DEFAULT_TAG;
 697         /* don't filter on BSS type */
 698         cfg->bss_type = SCAN_BSS_TYPE_ANY;
 699         /* currently NL80211 supports only a single interval */
 700         for (i = 0; i < SCAN_MAX_CYCLE_INTERVALS; i++)
 701                 cfg->intervals[i] = cpu_to_le32(req->interval);
 702
 703         cfg->ssid_len = 0;
 704         ret = wl12xx_scan_sched_scan_ssid_list(wl, wlvif, req);
 705         if (ret < 0)
 706                 goto out;
 707
 708         cfg->filter_type = ret;
 709
 710         wl1271_debug(DEBUG_SCAN, "filter_type = %d", cfg->filter_type);
 711
 712         if (!wl1271_scan_sched_scan_channels(wl, req, cfg)) {
 713                 wl1271_error("scan channel list is empty");
 714                 ret = -EINVAL;
 715                 goto out;
 716         }
 717
 718         if (!force_passive && cfg->active[0]) {
 719                 u8 band = IEEE80211_BAND_2GHZ;
 720                 ret = wl12xx_cmd_build_probe_req(wl, wlvif,
 721                                                  wlvif->dev_role_id, band,
 722                                                  req->ssids[0].ssid,
 723                                                  req->ssids[0].ssid_len,
 724                                                  ies->ie[band],
 725                                                  ies->len[band], true);
 726                 if (ret < 0) {
 727                         wl1271_error("2.4GHz PROBE request template failed");
 728                         goto out;
 729                 }
 730         }
 731
 732         if (!force_passive && cfg->active[1]) {
 733                 u8 band = IEEE80211_BAND_5GHZ;
 734                 ret = wl12xx_cmd_build_probe_req(wl, wlvif,
 735                                                  wlvif->dev_role_id, band,
 736                                                  req->ssids[0].ssid,
 737                                                  req->ssids[0].ssid_len,
 738                                                  ies->ie[band],
 739                                                  ies->len[band], true);
 740                 if (ret < 0) {
 741                         wl1271_error("5GHz PROBE request template failed");
 742                         goto out;
 743                 }
 744         }
 745
 746         wl1271_dump(DEBUG_SCAN, "SCAN_CFG: ", cfg, sizeof(*cfg));
 747
 748         ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_CFG, cfg,
 749                               sizeof(*cfg), 0);
 750         if (ret < 0) {
 751                 wl1271_error("SCAN configuration failed");
 752                 goto out;
 753         }
 754 out:
 755         kfree(cfg);
 756         return ret;
 757 }
 758
 759 int wl1271_scan_sched_scan_start(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 760 {
 761         struct wl1271_cmd_sched_scan_start *start;
 762         int ret = 0;
 763
 764         wl1271_debug(DEBUG_CMD, "cmd periodic scan start");
 765
 766         if (wlvif->bss_type != BSS_TYPE_STA_BSS)
 767                 return -EOPNOTSUPP;
 768
 769         if ((wl->quirks & WLCORE_QUIRK_NO_SCHED_SCAN_WHILE_CONN) &&
 770             test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags))
 771                 return -EBUSY;
 772
 773         start = kzalloc(sizeof(*start), GFP_KERNEL);
 774         if (!start)
 775                 return -ENOMEM;
 776
 777         start->role_id = wlvif->dev_role_id;
 778         start->tag = WL1271_SCAN_DEFAULT_TAG;
 779
 780         ret = wl1271_cmd_send(wl, CMD_START_PERIODIC_SCAN, start,
 781                               sizeof(*start), 0);
 782         if (ret < 0) {
 783                 wl1271_error("failed to send scan start command");
 784                 goto out_free;
 785         }
 786
 787 out_free:
 788         kfree(start);
 789         return ret;
 790 }
 791
 792 void wl1271_scan_sched_scan_results(struct wl1271 *wl)
 793 {
 794         wl1271_debug(DEBUG_SCAN, "got periodic scan results");
 795
 796         ieee80211_sched_scan_results(wl->hw);
 797 }
 798
 799 void wl1271_scan_sched_scan_stop(struct wl1271 *wl,  struct wl12xx_vif *wlvif)
 800 {
 801         struct wl1271_cmd_sched_scan_stop *stop;
 802         int ret = 0;
 803
 804         wl1271_debug(DEBUG_CMD, "cmd periodic scan stop");
 805
 806         /* FIXME: what to do if alloc'ing to stop fails? */
 807         stop = kzalloc(sizeof(*stop), GFP_KERNEL);
 808         if (!stop) {
 809                 wl1271_error("failed to alloc memory to send sched scan stop");
 810                 return;
 811         }
 812
 813         stop->role_id = wlvif->dev_role_id;
 814         stop->tag = WL1271_SCAN_DEFAULT_TAG;
 815
 816         ret = wl1271_cmd_send(wl, CMD_STOP_PERIODIC_SCAN, stop,
 817                               sizeof(*stop), 0);
 818         if (ret < 0) {
 819                 wl1271_error("failed to send sched scan stop command");
 820                 goto out_free;
 821         }
 822
 823 out_free:
 824         kfree(stop);
 825 }