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 wl12xx_vif *wlvif;
  39         struct cfg80211_scan_info info = {
  40                 .aborted = false,
  41         };
  42         int ret;
  43
  44         dwork = to_delayed_work(work);
  45         wl = container_of(dwork, struct wl1271, scan_complete_work);
  46
  47         wl1271_debug(DEBUG_SCAN, "Scanning complete");
  48
  49         mutex_lock(&wl->mutex);
  50
  51         if (unlikely(wl->state != WLCORE_STATE_ON))
  52                 goto out;
  53
  54         if (wl->scan.state == WL1271_SCAN_STATE_IDLE)
  55                 goto out;
  56
  57         wlvif = wl->scan_wlvif;
  58
  59         /*
  60          * Rearm the tx watchdog just before idling scan. This
  61          * prevents just-finished scans from triggering the watchdog
  62          */
  63         wl12xx_rearm_tx_watchdog_locked(wl);
  64
  65         wl->scan.state = WL1271_SCAN_STATE_IDLE;
  66         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
  67         wl->scan.req = NULL;
  68         wl->scan_wlvif = NULL;
  69
  70         ret = wl1271_ps_elp_wakeup(wl);
  71         if (ret < 0)
  72                 goto out;
  73
  74         if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags)) {
  75                 /* restore hardware connection monitoring template */
  76                 wl1271_cmd_build_ap_probe_req(wl, wlvif, wlvif->probereq);
  77         }
  78
  79         wl1271_ps_elp_sleep(wl);
  80
  81         if (wl->scan.failed) {
  82                 wl1271_info("Scan completed due to error.");
  83                 wl12xx_queue_recovery_work(wl);
  84         }
  85
  86         wlcore_cmd_regdomain_config_locked(wl);
  87
  88         ieee80211_scan_completed(wl->hw, &info);
  89
  90 out:
  91         mutex_unlock(&wl->mutex);
  92
  93 }
  94
  95 static void wlcore_started_vifs_iter(void *data, u8 *mac,
  96                                      struct ieee80211_vif *vif)
  97 {
  98         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
  99         bool active = false;
 100         int *count = (int *)data;
 101
 102         /*
 103          * count active interfaces according to interface type.
 104          * checking only bss_conf.idle is bad for some cases, e.g.
 105          * we don't want to count sta in p2p_find as active interface.
 106          */
 107         switch (wlvif->bss_type) {
 108         case BSS_TYPE_STA_BSS:
 109                 if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags))
 110                         active = true;
 111                 break;
 112
 113         case BSS_TYPE_AP_BSS:
 114                 if (wlvif->wl->active_sta_count > 0)
 115                         active = true;
 116                 break;
 117
 118         default:
 119                 break;
 120         }
 121
 122         if (active)
 123                 (*count)++;
 124 }
 125
 126 static int wlcore_count_started_vifs(struct wl1271 *wl)
 127 {
 128         int count = 0;
 129
 130         ieee80211_iterate_active_interfaces_atomic(wl->hw,
 131                                         IEEE80211_IFACE_ITER_RESUME_ALL,
 132                                         wlcore_started_vifs_iter, &count);
 133         return count;
 134 }
 135
 136 static int
 137 wlcore_scan_get_channels(struct wl1271 *wl,
 138                          struct ieee80211_channel *req_channels[],
 139                          u32 n_channels,
 140                          u32 n_ssids,
 141                          struct conn_scan_ch_params *channels,
 142                          u32 band, bool radar, bool passive,
 143                          int start, int max_channels,
 144                          u8 *n_pactive_ch,
 145                          int scan_type)
 146 {
 147         int i, j;
 148         u32 flags;
 149         bool force_passive = !n_ssids;
 150         u32 min_dwell_time_active, max_dwell_time_active;
 151         u32 dwell_time_passive, dwell_time_dfs;
 152
 153         /* configure dwell times according to scan type */
 154         if (scan_type == SCAN_TYPE_SEARCH) {
 155                 struct conf_scan_settings *c = &wl->conf.scan;
 156                 bool active_vif_exists = !!wlcore_count_started_vifs(wl);
 157
 158                 min_dwell_time_active = active_vif_exists ?
 159                         c->min_dwell_time_active :
 160                         c->min_dwell_time_active_long;
 161                 max_dwell_time_active = active_vif_exists ?
 162                         c->max_dwell_time_active :
 163                         c->max_dwell_time_active_long;
 164                 dwell_time_passive = c->dwell_time_passive;
 165                 dwell_time_dfs = c->dwell_time_dfs;
 166         } else {
 167                 struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 168                 u32 delta_per_probe;
 169
 170                 if (band == NL80211_BAND_5GHZ)
 171                         delta_per_probe = c->dwell_time_delta_per_probe_5;
 172                 else
 173                         delta_per_probe = c->dwell_time_delta_per_probe;
 174
 175                 min_dwell_time_active = c->base_dwell_time +
 176                          n_ssids * c->num_probe_reqs * delta_per_probe;
 177
 178                 max_dwell_time_active = min_dwell_time_active +
 179                                         c->max_dwell_time_delta;
 180                 dwell_time_passive = c->dwell_time_passive;
 181                 dwell_time_dfs = c->dwell_time_dfs;
 182         }
 183         min_dwell_time_active = DIV_ROUND_UP(min_dwell_time_active, 1000);
 184         max_dwell_time_active = DIV_ROUND_UP(max_dwell_time_active, 1000);
 185         dwell_time_passive = DIV_ROUND_UP(dwell_time_passive, 1000);
 186         dwell_time_dfs = DIV_ROUND_UP(dwell_time_dfs, 1000);
 187
 188         for (i = 0, j = start;
 189              i < n_channels && j < max_channels;
 190              i++) {
 191                 flags = req_channels[i]->flags;
 192
 193                 if (force_passive)
 194                         flags |= IEEE80211_CHAN_NO_IR;
 195
 196                 if ((req_channels[i]->band == band) &&
 197                     !(flags & IEEE80211_CHAN_DISABLED) &&
 198                     (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
 199                     /* if radar is set, we ignore the passive flag */
 200                     (radar ||
 201                      !!(flags & IEEE80211_CHAN_NO_IR) == passive)) {
 202                         if (flags & IEEE80211_CHAN_RADAR) {
 203                                 channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
 204
 205                                 channels[j].passive_duration =
 206                                         cpu_to_le16(dwell_time_dfs);
 207                         } else {
 208                                 channels[j].passive_duration =
 209                                         cpu_to_le16(dwell_time_passive);
 210                         }
 211
 212                         channels[j].min_duration =
 213                                 cpu_to_le16(min_dwell_time_active);
 214                         channels[j].max_duration =
 215                                 cpu_to_le16(max_dwell_time_active);
 216
 217                         channels[j].tx_power_att = req_channels[i]->max_power;
 218                         channels[j].channel = req_channels[i]->hw_value;
 219
 220                         if (n_pactive_ch &&
 221                             (band == NL80211_BAND_2GHZ) &&
 222                             (channels[j].channel >= 12) &&
 223                             (channels[j].channel <= 14) &&
 224                             (flags & IEEE80211_CHAN_NO_IR) &&
 225                             !force_passive) {
 226                                 /* pactive channels treated as DFS */
 227                                 channels[j].flags = SCAN_CHANNEL_FLAGS_DFS;
 228
 229                                 /*
 230                                  * n_pactive_ch is counted down from the end of
 231                                  * the passive channel list
 232                                  */
 233                                 (*n_pactive_ch)++;
 234                                 wl1271_debug(DEBUG_SCAN, "n_pactive_ch = %d",
 235                                              *n_pactive_ch);
 236                         }
 237
 238                         wl1271_debug(DEBUG_SCAN, "freq %d, ch. %d, flags 0x%x, power %d, min/max_dwell %d/%d%s%s",
 239                                      req_channels[i]->center_freq,
 240                                      req_channels[i]->hw_value,
 241                                      req_channels[i]->flags,
 242                                      req_channels[i]->max_power,
 243                                      min_dwell_time_active,
 244                                      max_dwell_time_active,
 245                                      flags & IEEE80211_CHAN_RADAR ?
 246                                         ", DFS" : "",
 247                                      flags & IEEE80211_CHAN_NO_IR ?
 248                                         ", NO-IR" : "");
 249                         j++;
 250                 }
 251         }
 252
 253         return j - start;
 254 }
 255
 256 bool
 257 wlcore_set_scan_chan_params(struct wl1271 *wl,
 258                             struct wlcore_scan_channels *cfg,
 259                             struct ieee80211_channel *channels[],
 260                             u32 n_channels,
 261                             u32 n_ssids,
 262                             int scan_type)
 263 {
 264         u8 n_pactive_ch = 0;
 265
 266         cfg->passive[0] =
 267                 wlcore_scan_get_channels(wl,
 268                                          channels,
 269                                          n_channels,
 270                                          n_ssids,
 271                                          cfg->channels_2,
 272                                          NL80211_BAND_2GHZ,
 273                                          false, true, 0,
 274                                          MAX_CHANNELS_2GHZ,
 275                                          &n_pactive_ch,
 276                                          scan_type);
 277         cfg->active[0] =
 278                 wlcore_scan_get_channels(wl,
 279                                          channels,
 280                                          n_channels,
 281                                          n_ssids,
 282                                          cfg->channels_2,
 283                                          NL80211_BAND_2GHZ,
 284                                          false, false,
 285                                          cfg->passive[0],
 286                                          MAX_CHANNELS_2GHZ,
 287                                          &n_pactive_ch,
 288                                          scan_type);
 289         cfg->passive[1] =
 290                 wlcore_scan_get_channels(wl,
 291                                          channels,
 292                                          n_channels,
 293                                          n_ssids,
 294                                          cfg->channels_5,
 295                                          NL80211_BAND_5GHZ,
 296                                          false, true, 0,
 297                                          wl->max_channels_5,
 298                                          &n_pactive_ch,
 299                                          scan_type);
 300         cfg->dfs =
 301                 wlcore_scan_get_channels(wl,
 302                                          channels,
 303                                          n_channels,
 304                                          n_ssids,
 305                                          cfg->channels_5,
 306                                          NL80211_BAND_5GHZ,
 307                                          true, true,
 308                                          cfg->passive[1],
 309                                          wl->max_channels_5,
 310                                          &n_pactive_ch,
 311                                          scan_type);
 312         cfg->active[1] =
 313                 wlcore_scan_get_channels(wl,
 314                                          channels,
 315                                          n_channels,
 316                                          n_ssids,
 317                                          cfg->channels_5,
 318                                          NL80211_BAND_5GHZ,
 319                                          false, false,
 320                                          cfg->passive[1] + cfg->dfs,
 321                                          wl->max_channels_5,
 322                                          &n_pactive_ch,
 323                                          scan_type);
 324
 325         /* 802.11j channels are not supported yet */
 326         cfg->passive[2] = 0;
 327         cfg->active[2] = 0;
 328
 329         cfg->passive_active = n_pactive_ch;
 330
 331         wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
 332                      cfg->active[0], cfg->passive[0]);
 333         wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
 334                      cfg->active[1], cfg->passive[1]);
 335         wl1271_debug(DEBUG_SCAN, "    DFS: %d", cfg->dfs);
 336
 337         return  cfg->passive[0] || cfg->active[0] ||
 338                 cfg->passive[1] || cfg->active[1] || cfg->dfs ||
 339                 cfg->passive[2] || cfg->active[2];
 340 }
 341 EXPORT_SYMBOL_GPL(wlcore_set_scan_chan_params);
 342
 343 int wlcore_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
 344                 const u8 *ssid, size_t ssid_len,
 345                 struct cfg80211_scan_request *req)
 346 {
 347         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 348
 349         /*
 350          * cfg80211 should guarantee that we don't get more channels
 351          * than what we have registered.
 352          */
 353         BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
 354
 355         if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
 356                 return -EBUSY;
 357
 358         wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
 359
 360         if (ssid_len && ssid) {
 361                 wl->scan.ssid_len = ssid_len;
 362                 memcpy(wl->scan.ssid, ssid, ssid_len);
 363         } else {
 364                 wl->scan.ssid_len = 0;
 365         }
 366
 367         wl->scan_wlvif = wlvif;
 368         wl->scan.req = req;
 369         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
 370
 371         /* we assume failure so that timeout scenarios are handled correctly */
 372         wl->scan.failed = true;
 373         ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 374                                      msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
 375
 376         wl->ops->scan_start(wl, wlvif, req);
 377
 378         return 0;
 379 }
 380 /* Returns the scan type to be used or a negative value on error */
 381 int
 382 wlcore_scan_sched_scan_ssid_list(struct wl1271 *wl,
 383                                  struct wl12xx_vif *wlvif,
 384                                  struct cfg80211_sched_scan_request *req)
 385 {
 386         struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
 387         struct cfg80211_match_set *sets = req->match_sets;
 388         struct cfg80211_ssid *ssids = req->ssids;
 389         int ret = 0, type, i, j, n_match_ssids = 0;
 390
 391         wl1271_debug((DEBUG_CMD | DEBUG_SCAN), "cmd sched scan ssid list");
 392
 393         /* count the match sets that contain SSIDs */
 394         for (i = 0; i < req->n_match_sets; i++)
 395                 if (sets[i].ssid.ssid_len > 0)
 396                         n_match_ssids++;
 397
 398         /* No filter, no ssids or only bcast ssid */
 399         if (!n_match_ssids &&
 400             (!req->n_ssids ||
 401              (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
 402                 type = SCAN_SSID_FILTER_ANY;
 403                 goto out;
 404         }
 405
 406         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 407         if (!cmd) {
 408                 ret = -ENOMEM;
 409                 goto out;
 410         }
 411
 412         cmd->role_id = wlvif->role_id;
 413         if (!n_match_ssids) {
 414                 /* No filter, with ssids */
 415                 type = SCAN_SSID_FILTER_DISABLED;
 416
 417                 for (i = 0; i < req->n_ssids; i++) {
 418                         cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
 419                                 SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
 420                         cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
 421                         memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
 422                                ssids[i].ssid_len);
 423                         cmd->n_ssids++;
 424                 }
 425         } else {
 426                 type = SCAN_SSID_FILTER_LIST;
 427
 428                 /* Add all SSIDs from the filters */
 429                 for (i = 0; i < req->n_match_sets; i++) {
 430                         /* ignore sets without SSIDs */
 431                         if (!sets[i].ssid.ssid_len)
 432                                 continue;
 433
 434                         cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
 435                         cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
 436                         memcpy(cmd->ssids[cmd->n_ssids].ssid,
 437                                sets[i].ssid.ssid, sets[i].ssid.ssid_len);
 438                         cmd->n_ssids++;
 439                 }
 440                 if ((req->n_ssids > 1) ||
 441                     (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
 442                         /*
 443                          * Mark all the SSIDs passed in the SSID list as HIDDEN,
 444                          * so they're used in probe requests.
 445                          */
 446                         for (i = 0; i < req->n_ssids; i++) {
 447                                 if (!req->ssids[i].ssid_len)
 448                                         continue;
 449
 450                                 for (j = 0; j < cmd->n_ssids; j++)
 451                                         if ((req->ssids[i].ssid_len ==
 452                                              cmd->ssids[j].len) &&
 453                                             !memcmp(req->ssids[i].ssid,
 454                                                    cmd->ssids[j].ssid,
 455                                                    req->ssids[i].ssid_len)) {
 456                                                 cmd->ssids[j].type =
 457                                                         SCAN_SSID_TYPE_HIDDEN;
 458                                                 break;
 459                                         }
 460                                 /* Fail if SSID isn't present in the filters */
 461                                 if (j == cmd->n_ssids) {
 462                                         ret = -EINVAL;
 463                                         goto out_free;
 464                                 }
 465                         }
 466                 }
 467         }
 468
 469         ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
 470                               sizeof(*cmd), 0);
 471         if (ret < 0) {
 472                 wl1271_error("cmd sched scan ssid list failed");
 473                 goto out_free;
 474         }
 475
 476 out_free:
 477         kfree(cmd);
 478 out:
 479         if (ret < 0)
 480                 return ret;
 481         return type;
 482 }
 483 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_ssid_list);
 484
 485 void wlcore_scan_sched_scan_results(struct wl1271 *wl)
 486 {
 487         wl1271_debug(DEBUG_SCAN, "got periodic scan results");
 488
 489         ieee80211_sched_scan_results(wl->hw);
 490 }
 491 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_results);