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 = container_of(work, struct 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 == IEEE80211_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_PASSIVE_SCAN;
 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_PASSIVE_SCAN) == passive)) {
 199
 200
 201                         if (flags & IEEE80211_CHAN_RADAR) {
 202                                 channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
 203
 204                                 channels[j].passive_duration =
 205                                         cpu_to_le16(dwell_time_dfs);
 206                         } else {
 207                                 channels[j].passive_duration =
 208                                         cpu_to_le16(dwell_time_passive);
 209                         }
 210
 211                         channels[j].min_duration =
 212                                 cpu_to_le16(min_dwell_time_active);
 213                         channels[j].max_duration =
 214                                 cpu_to_le16(max_dwell_time_active);
 215
 216                         channels[j].tx_power_att = req_channels[i]->max_power;
 217                         channels[j].channel = req_channels[i]->hw_value;
 218
 219                         if (n_pactive_ch &&
 220                             (band == IEEE80211_BAND_2GHZ) &&
 221                             (channels[j].channel >= 12) &&
 222                             (channels[j].channel <= 14) &&
 223                             (flags & IEEE80211_CHAN_PASSIVE_SCAN) &&
 224                             !force_passive) {
 225                                 /* pactive channels treated as DFS */
 226                                 channels[j].flags = SCAN_CHANNEL_FLAGS_DFS;
 227
 228                                 /*
 229                                  * n_pactive_ch is counted down from the end of
 230                                  * the passive channel list
 231                                  */
 232                                 (*n_pactive_ch)++;
 233                                 wl1271_debug(DEBUG_SCAN, "n_pactive_ch = %d",
 234                                              *n_pactive_ch);
 235                         }
 236
 237                         wl1271_debug(DEBUG_SCAN, "freq %d, ch. %d, flags 0x%x, power %d, min/max_dwell %d/%d%s%s",
 238                                      req_channels[i]->center_freq,
 239                                      req_channels[i]->hw_value,
 240                                      req_channels[i]->flags,
 241                                      req_channels[i]->max_power,
 242                                      min_dwell_time_active,
 243                                      max_dwell_time_active,
 244                                      flags & IEEE80211_CHAN_RADAR ?
 245                                         ", DFS" : "",
 246                                      flags & IEEE80211_CHAN_PASSIVE_SCAN ?
 247                                         ", PASSIVE" : "");
 248                         j++;
 249                 }
 250         }
 251
 252         return j - start;
 253 }
 254
 255 bool
 256 wlcore_set_scan_chan_params(struct wl1271 *wl,
 257                             struct wlcore_scan_channels *cfg,
 258                             struct ieee80211_channel *channels[],
 259                             u32 n_channels,
 260                             u32 n_ssids,
 261                             int scan_type)
 262 {
 263         u8 n_pactive_ch = 0;
 264
 265         cfg->passive[0] =
 266                 wlcore_scan_get_channels(wl,
 267                                          channels,
 268                                          n_channels,
 269                                          n_ssids,
 270                                          cfg->channels_2,
 271                                          IEEE80211_BAND_2GHZ,
 272                                          false, true, 0,
 273                                          MAX_CHANNELS_2GHZ,
 274                                          &n_pactive_ch,
 275                                          scan_type);
 276         cfg->active[0] =
 277                 wlcore_scan_get_channels(wl,
 278                                          channels,
 279                                          n_channels,
 280                                          n_ssids,
 281                                          cfg->channels_2,
 282                                          IEEE80211_BAND_2GHZ,
 283                                          false, false,
 284                                          cfg->passive[0],
 285                                          MAX_CHANNELS_2GHZ,
 286                                          &n_pactive_ch,
 287                                          scan_type);
 288         cfg->passive[1] =
 289                 wlcore_scan_get_channels(wl,
 290                                          channels,
 291                                          n_channels,
 292                                          n_ssids,
 293                                          cfg->channels_5,
 294                                          IEEE80211_BAND_5GHZ,
 295                                          false, true, 0,
 296                                          wl->max_channels_5,
 297                                          &n_pactive_ch,
 298                                          scan_type);
 299         cfg->dfs =
 300                 wlcore_scan_get_channels(wl,
 301                                          channels,
 302                                          n_channels,
 303                                          n_ssids,
 304                                          cfg->channels_5,
 305                                          IEEE80211_BAND_5GHZ,
 306                                          true, true,
 307                                          cfg->passive[1],
 308                                          wl->max_channels_5,
 309                                          &n_pactive_ch,
 310                                          scan_type);
 311         cfg->active[1] =
 312                 wlcore_scan_get_channels(wl,
 313                                          channels,
 314                                          n_channels,
 315                                          n_ssids,
 316                                          cfg->channels_5,
 317                                          IEEE80211_BAND_5GHZ,
 318                                          false, false,
 319                                          cfg->passive[1] + cfg->dfs,
 320                                          wl->max_channels_5,
 321                                          &n_pactive_ch,
 322                                          scan_type);
 323
 324         /* 802.11j channels are not supported yet */
 325         cfg->passive[2] = 0;
 326         cfg->active[2] = 0;
 327
 328         cfg->passive_active = n_pactive_ch;
 329
 330         wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
 331                      cfg->active[0], cfg->passive[0]);
 332         wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
 333                      cfg->active[1], cfg->passive[1]);
 334         wl1271_debug(DEBUG_SCAN, "    DFS: %d", cfg->dfs);
 335
 336         return  cfg->passive[0] || cfg->active[0] ||
 337                 cfg->passive[1] || cfg->active[1] || cfg->dfs ||
 338                 cfg->passive[2] || cfg->active[2];
 339 }
 340 EXPORT_SYMBOL_GPL(wlcore_set_scan_chan_params);
 341
 342 int wlcore_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
 343                 const u8 *ssid, size_t ssid_len,
 344                 struct cfg80211_scan_request *req)
 345 {
 346         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 347
 348         /*
 349          * cfg80211 should guarantee that we don't get more channels
 350          * than what we have registered.
 351          */
 352         BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
 353
 354         if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
 355                 return -EBUSY;
 356
 357         wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
 358
 359         if (ssid_len && ssid) {
 360                 wl->scan.ssid_len = ssid_len;
 361                 memcpy(wl->scan.ssid, ssid, ssid_len);
 362         } else {
 363                 wl->scan.ssid_len = 0;
 364         }
 365
 366         wl->scan_wlvif = wlvif;
 367         wl->scan.req = req;
 368         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
 369
 370         /* we assume failure so that timeout scenarios are handled correctly */
 371         wl->scan.failed = true;
 372         ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 373                                      msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
 374
 375         wl->ops->scan_start(wl, wlvif, req);
 376
 377         return 0;
 378 }
 379 /* Returns the scan type to be used or a negative value on error */
 380 int
 381 wlcore_scan_sched_scan_ssid_list(struct wl1271 *wl,
 382                                  struct wl12xx_vif *wlvif,
 383                                  struct cfg80211_sched_scan_request *req)
 384 {
 385         struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
 386         struct cfg80211_match_set *sets = req->match_sets;
 387         struct cfg80211_ssid *ssids = req->ssids;
 388         int ret = 0, type, i, j, n_match_ssids = 0;
 389
 390         wl1271_debug((DEBUG_CMD | DEBUG_SCAN), "cmd sched scan ssid list");
 391
 392         /* count the match sets that contain SSIDs */
 393         for (i = 0; i < req->n_match_sets; i++)
 394                 if (sets[i].ssid.ssid_len > 0)
 395                         n_match_ssids++;
 396
 397         /* No filter, no ssids or only bcast ssid */
 398         if (!n_match_ssids &&
 399             (!req->n_ssids ||
 400              (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
 401                 type = SCAN_SSID_FILTER_ANY;
 402                 goto out;
 403         }
 404
 405         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 406         if (!cmd) {
 407                 ret = -ENOMEM;
 408                 goto out;
 409         }
 410
 411         cmd->role_id = wlvif->role_id;
 412         if (!n_match_ssids) {
 413                 /* No filter, with ssids */
 414                 type = SCAN_SSID_FILTER_DISABLED;
 415
 416                 for (i = 0; i < req->n_ssids; i++) {
 417                         cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
 418                                 SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
 419                         cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
 420                         memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
 421                                ssids[i].ssid_len);
 422                         cmd->n_ssids++;
 423                 }
 424         } else {
 425                 type = SCAN_SSID_FILTER_LIST;
 426
 427                 /* Add all SSIDs from the filters */
 428                 for (i = 0; i < req->n_match_sets; i++) {
 429                         /* ignore sets without SSIDs */
 430                         if (!sets[i].ssid.ssid_len)
 431                                 continue;
 432
 433                         cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
 434                         cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
 435                         memcpy(cmd->ssids[cmd->n_ssids].ssid,
 436                                sets[i].ssid.ssid, sets[i].ssid.ssid_len);
 437                         cmd->n_ssids++;
 438                 }
 439                 if ((req->n_ssids > 1) ||
 440                     (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
 441                         /*
 442                          * Mark all the SSIDs passed in the SSID list as HIDDEN,
 443                          * so they're used in probe requests.
 444                          */
 445                         for (i = 0; i < req->n_ssids; i++) {
 446                                 if (!req->ssids[i].ssid_len)
 447                                         continue;
 448
 449                                 for (j = 0; j < cmd->n_ssids; j++)
 450                                         if ((req->ssids[i].ssid_len ==
 451                                              cmd->ssids[j].len) &&
 452                                             !memcmp(req->ssids[i].ssid,
 453                                                    cmd->ssids[j].ssid,
 454                                                    req->ssids[i].ssid_len)) {
 455                                                 cmd->ssids[j].type =
 456                                                         SCAN_SSID_TYPE_HIDDEN;
 457                                                 break;
 458                                         }
 459                                 /* Fail if SSID isn't present in the filters */
 460                                 if (j == cmd->n_ssids) {
 461                                         ret = -EINVAL;
 462                                         goto out_free;
 463                                 }
 464                         }
 465                 }
 466         }
 467
 468         ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
 469                               sizeof(*cmd), 0);
 470         if (ret < 0) {
 471                 wl1271_error("cmd sched scan ssid list failed");
 472                 goto out_free;
 473         }
 474
 475 out_free:
 476         kfree(cmd);
 477 out:
 478         if (ret < 0)
 479                 return ret;
 480         return type;
 481 }
 482 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_ssid_list);
 483
 484 void wlcore_scan_sched_scan_results(struct wl1271 *wl)
 485 {
 486         wl1271_debug(DEBUG_SCAN, "got periodic scan results");
 487
 488         ieee80211_sched_scan_results(wl->hw);
 489 }
 490 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_results);