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         int *count = (int *)data;
  96
  97         if (!vif->bss_conf.idle)
  98                 (*count)++;
  99 }
 100
 101 static int wlcore_count_started_vifs(struct wl1271 *wl)
 102 {
 103         int count = 0;
 104
 105         ieee80211_iterate_active_interfaces_atomic(wl->hw,
 106                                         IEEE80211_IFACE_ITER_RESUME_ALL,
 107                                         wlcore_started_vifs_iter, &count);
 108         return count;
 109 }
 110
 111 static int
 112 wlcore_scan_get_channels(struct wl1271 *wl,
 113                          struct ieee80211_channel *req_channels[],
 114                          u32 n_channels,
 115                          u32 n_ssids,
 116                          struct conn_scan_ch_params *channels,
 117                          u32 band, bool radar, bool passive,
 118                          int start, int max_channels,
 119                          u8 *n_pactive_ch,
 120                          int scan_type)
 121 {
 122         int i, j;
 123         u32 flags;
 124         bool force_passive = !n_ssids;
 125         u32 min_dwell_time_active, max_dwell_time_active;
 126         u32 dwell_time_passive, dwell_time_dfs;
 127
 128         /* configure dwell times according to scan type */
 129         if (scan_type == SCAN_TYPE_SEARCH) {
 130                 struct conf_scan_settings *c = &wl->conf.scan;
 131                 bool active_vif_exists = !!wlcore_count_started_vifs(wl);
 132
 133                 min_dwell_time_active = active_vif_exists ?
 134                         c->min_dwell_time_active :
 135                         c->min_dwell_time_active_long;
 136                 max_dwell_time_active = active_vif_exists ?
 137                         c->max_dwell_time_active :
 138                         c->max_dwell_time_active_long;
 139                 dwell_time_passive = c->dwell_time_passive;
 140                 dwell_time_dfs = c->dwell_time_dfs;
 141         } else {
 142                 struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 143                 u32 delta_per_probe;
 144
 145                 if (band == IEEE80211_BAND_5GHZ)
 146                         delta_per_probe = c->dwell_time_delta_per_probe_5;
 147                 else
 148                         delta_per_probe = c->dwell_time_delta_per_probe;
 149
 150                 min_dwell_time_active = c->base_dwell_time +
 151                          n_ssids * c->num_probe_reqs * delta_per_probe;
 152
 153                 max_dwell_time_active = min_dwell_time_active +
 154                                         c->max_dwell_time_delta;
 155                 dwell_time_passive = c->dwell_time_passive;
 156                 dwell_time_dfs = c->dwell_time_dfs;
 157         }
 158         min_dwell_time_active = DIV_ROUND_UP(min_dwell_time_active, 1000);
 159         max_dwell_time_active = DIV_ROUND_UP(max_dwell_time_active, 1000);
 160         dwell_time_passive = DIV_ROUND_UP(dwell_time_passive, 1000);
 161         dwell_time_dfs = DIV_ROUND_UP(dwell_time_dfs, 1000);
 162
 163         for (i = 0, j = start;
 164              i < n_channels && j < max_channels;
 165              i++) {
 166                 flags = req_channels[i]->flags;
 167
 168                 if (force_passive)
 169                         flags |= IEEE80211_CHAN_PASSIVE_SCAN;
 170
 171                 if ((req_channels[i]->band == band) &&
 172                     !(flags & IEEE80211_CHAN_DISABLED) &&
 173                     (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
 174                     /* if radar is set, we ignore the passive flag */
 175                     (radar ||
 176                      !!(flags & IEEE80211_CHAN_PASSIVE_SCAN) == passive)) {
 177                         wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
 178                                      req_channels[i]->band,
 179                                      req_channels[i]->center_freq);
 180                         wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
 181                                      req_channels[i]->hw_value,
 182                                      req_channels[i]->flags);
 183                         wl1271_debug(DEBUG_SCAN, "max_power %d",
 184                                      req_channels[i]->max_power);
 185                         wl1271_debug(DEBUG_SCAN, "min_dwell_time %d max dwell time %d",
 186                                      min_dwell_time_active,
 187                                      max_dwell_time_active);
 188
 189                         if (flags & IEEE80211_CHAN_RADAR) {
 190                                 channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
 191
 192                                 channels[j].passive_duration =
 193                                         cpu_to_le16(dwell_time_dfs);
 194                         } else {
 195                                 channels[j].passive_duration =
 196                                         cpu_to_le16(dwell_time_passive);
 197                         }
 198
 199                         channels[j].min_duration =
 200                                 cpu_to_le16(min_dwell_time_active);
 201                         channels[j].max_duration =
 202                                 cpu_to_le16(max_dwell_time_active);
 203
 204                         channels[j].tx_power_att = req_channels[i]->max_power;
 205                         channels[j].channel = req_channels[i]->hw_value;
 206
 207                         if (n_pactive_ch &&
 208                             (band == IEEE80211_BAND_2GHZ) &&
 209                             (channels[j].channel >= 12) &&
 210                             (channels[j].channel <= 14) &&
 211                             (flags & IEEE80211_CHAN_PASSIVE_SCAN) &&
 212                             !force_passive) {
 213                                 /* pactive channels treated as DFS */
 214                                 channels[j].flags = SCAN_CHANNEL_FLAGS_DFS;
 215
 216                                 /*
 217                                  * n_pactive_ch is counted down from the end of
 218                                  * the passive channel list
 219                                  */
 220                                 (*n_pactive_ch)++;
 221                                 wl1271_debug(DEBUG_SCAN, "n_pactive_ch = %d",
 222                                              *n_pactive_ch);
 223                         }
 224
 225                         j++;
 226                 }
 227         }
 228
 229         return j - start;
 230 }
 231
 232 bool
 233 wlcore_set_scan_chan_params(struct wl1271 *wl,
 234                             struct wlcore_scan_channels *cfg,
 235                             struct ieee80211_channel *channels[],
 236                             u32 n_channels,
 237                             u32 n_ssids,
 238                             int scan_type)
 239 {
 240         u8 n_pactive_ch = 0;
 241
 242         cfg->passive[0] =
 243                 wlcore_scan_get_channels(wl,
 244                                          channels,
 245                                          n_channels,
 246                                          n_ssids,
 247                                          cfg->channels_2,
 248                                          IEEE80211_BAND_2GHZ,
 249                                          false, true, 0,
 250                                          MAX_CHANNELS_2GHZ,
 251                                          &n_pactive_ch,
 252                                          scan_type);
 253         cfg->active[0] =
 254                 wlcore_scan_get_channels(wl,
 255                                          channels,
 256                                          n_channels,
 257                                          n_ssids,
 258                                          cfg->channels_2,
 259                                          IEEE80211_BAND_2GHZ,
 260                                          false, false,
 261                                          cfg->passive[0],
 262                                          MAX_CHANNELS_2GHZ,
 263                                          &n_pactive_ch,
 264                                          scan_type);
 265         cfg->passive[1] =
 266                 wlcore_scan_get_channels(wl,
 267                                          channels,
 268                                          n_channels,
 269                                          n_ssids,
 270                                          cfg->channels_5,
 271                                          IEEE80211_BAND_5GHZ,
 272                                          false, true, 0,
 273                                          wl->max_channels_5,
 274                                          &n_pactive_ch,
 275                                          scan_type);
 276         cfg->dfs =
 277                 wlcore_scan_get_channels(wl,
 278                                          channels,
 279                                          n_channels,
 280                                          n_ssids,
 281                                          cfg->channels_5,
 282                                          IEEE80211_BAND_5GHZ,
 283                                          true, true,
 284                                          cfg->passive[1],
 285                                          wl->max_channels_5,
 286                                          &n_pactive_ch,
 287                                          scan_type);
 288         cfg->active[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, false,
 296                                          cfg->passive[1] + cfg->dfs,
 297                                          wl->max_channels_5,
 298                                          &n_pactive_ch,
 299                                          scan_type);
 300
 301         /* 802.11j channels are not supported yet */
 302         cfg->passive[2] = 0;
 303         cfg->active[2] = 0;
 304
 305         cfg->passive_active = n_pactive_ch;
 306
 307         wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
 308                      cfg->active[0], cfg->passive[0]);
 309         wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
 310                      cfg->active[1], cfg->passive[1]);
 311         wl1271_debug(DEBUG_SCAN, "    DFS: %d", cfg->dfs);
 312
 313         return  cfg->passive[0] || cfg->active[0] ||
 314                 cfg->passive[1] || cfg->active[1] || cfg->dfs ||
 315                 cfg->passive[2] || cfg->active[2];
 316 }
 317 EXPORT_SYMBOL_GPL(wlcore_set_scan_chan_params);
 318
 319 int wlcore_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
 320                 const u8 *ssid, size_t ssid_len,
 321                 struct cfg80211_scan_request *req)
 322 {
 323         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 324
 325         /*
 326          * cfg80211 should guarantee that we don't get more channels
 327          * than what we have registered.
 328          */
 329         BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
 330
 331         if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
 332                 return -EBUSY;
 333
 334         wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
 335
 336         if (ssid_len && ssid) {
 337                 wl->scan.ssid_len = ssid_len;
 338                 memcpy(wl->scan.ssid, ssid, ssid_len);
 339         } else {
 340                 wl->scan.ssid_len = 0;
 341         }
 342
 343         wl->scan_wlvif = wlvif;
 344         wl->scan.req = req;
 345         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
 346
 347         /* we assume failure so that timeout scenarios are handled correctly */
 348         wl->scan.failed = true;
 349         ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 350                                      msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
 351
 352         wl->ops->scan_start(wl, wlvif, req);
 353
 354         return 0;
 355 }
 356 /* Returns the scan type to be used or a negative value on error */
 357 int
 358 wlcore_scan_sched_scan_ssid_list(struct wl1271 *wl,
 359                                  struct wl12xx_vif *wlvif,
 360                                  struct cfg80211_sched_scan_request *req)
 361 {
 362         struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
 363         struct cfg80211_match_set *sets = req->match_sets;
 364         struct cfg80211_ssid *ssids = req->ssids;
 365         int ret = 0, type, i, j, n_match_ssids = 0;
 366
 367         wl1271_debug(DEBUG_CMD, "cmd sched scan ssid list");
 368
 369         /* count the match sets that contain SSIDs */
 370         for (i = 0; i < req->n_match_sets; i++)
 371                 if (sets[i].ssid.ssid_len > 0)
 372                         n_match_ssids++;
 373
 374         /* No filter, no ssids or only bcast ssid */
 375         if (!n_match_ssids &&
 376             (!req->n_ssids ||
 377              (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
 378                 type = SCAN_SSID_FILTER_ANY;
 379                 goto out;
 380         }
 381
 382         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 383         if (!cmd) {
 384                 ret = -ENOMEM;
 385                 goto out;
 386         }
 387
 388         cmd->role_id = wlvif->role_id;
 389         if (!n_match_ssids) {
 390                 /* No filter, with ssids */
 391                 type = SCAN_SSID_FILTER_DISABLED;
 392
 393                 for (i = 0; i < req->n_ssids; i++) {
 394                         cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
 395                                 SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
 396                         cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
 397                         memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
 398                                ssids[i].ssid_len);
 399                         cmd->n_ssids++;
 400                 }
 401         } else {
 402                 type = SCAN_SSID_FILTER_LIST;
 403
 404                 /* Add all SSIDs from the filters */
 405                 for (i = 0; i < req->n_match_sets; i++) {
 406                         /* ignore sets without SSIDs */
 407                         if (!sets[i].ssid.ssid_len)
 408                                 continue;
 409
 410                         cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
 411                         cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
 412                         memcpy(cmd->ssids[cmd->n_ssids].ssid,
 413                                sets[i].ssid.ssid, sets[i].ssid.ssid_len);
 414                         cmd->n_ssids++;
 415                 }
 416                 if ((req->n_ssids > 1) ||
 417                     (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
 418                         /*
 419                          * Mark all the SSIDs passed in the SSID list as HIDDEN,
 420                          * so they're used in probe requests.
 421                          */
 422                         for (i = 0; i < req->n_ssids; i++) {
 423                                 if (!req->ssids[i].ssid_len)
 424                                         continue;
 425
 426                                 for (j = 0; j < cmd->n_ssids; j++)
 427                                         if ((req->ssids[i].ssid_len ==
 428                                              cmd->ssids[j].len) &&
 429                                             !memcmp(req->ssids[i].ssid,
 430                                                    cmd->ssids[j].ssid,
 431                                                    req->ssids[i].ssid_len)) {
 432                                                 cmd->ssids[j].type =
 433                                                         SCAN_SSID_TYPE_HIDDEN;
 434                                                 break;
 435                                         }
 436                                 /* Fail if SSID isn't present in the filters */
 437                                 if (j == cmd->n_ssids) {
 438                                         ret = -EINVAL;
 439                                         goto out_free;
 440                                 }
 441                         }
 442                 }
 443         }
 444
 445         wl1271_dump(DEBUG_SCAN, "SSID_LIST: ", cmd, sizeof(*cmd));
 446
 447         ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
 448                               sizeof(*cmd), 0);
 449         if (ret < 0) {
 450                 wl1271_error("cmd sched scan ssid list failed");
 451                 goto out_free;
 452         }
 453
 454 out_free:
 455         kfree(cmd);
 456 out:
 457         if (ret < 0)
 458                 return ret;
 459         return type;
 460 }
 461 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_ssid_list);
 462
 463 void wlcore_scan_sched_scan_results(struct wl1271 *wl)
 464 {
 465         wl1271_debug(DEBUG_SCAN, "got periodic scan results");
 466
 467         ieee80211_sched_scan_results(wl->hw);
 468 }
 469 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_results);