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