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 #include <linux/pm_runtime.h>
  26
  27 #include "wlcore.h"
  28 #include "debug.h"
  29 #include "cmd.h"
  30 #include "scan.h"
  31 #include "acx.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 = pm_runtime_get_sync(wl->dev);
  71         if (ret < 0) {
  72                 pm_runtime_put_noidle(wl->dev);
  73                 goto out;
  74         }
  75
  76         if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags)) {
  77                 /* restore hardware connection monitoring template */
  78                 wl1271_cmd_build_ap_probe_req(wl, wlvif, wlvif->probereq);
  79         }
  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         pm_runtime_mark_last_busy(wl->dev);
  89         pm_runtime_put_autosuspend(wl->dev);
  90
  91         ieee80211_scan_completed(wl->hw, &info);
  92
  93 out:
  94         mutex_unlock(&wl->mutex);
  95
  96 }
  97
  98 static void wlcore_started_vifs_iter(void *data, u8 *mac,
  99                                      struct ieee80211_vif *vif)
 100 {
 101         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 102         bool active = false;
 103         int *count = (int *)data;
 104
 105         /*
 106          * count active interfaces according to interface type.
 107          * checking only bss_conf.idle is bad for some cases, e.g.
 108          * we don't want to count sta in p2p_find as active interface.
 109          */
 110         switch (wlvif->bss_type) {
 111         case BSS_TYPE_STA_BSS:
 112                 if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags))
 113                         active = true;
 114                 break;
 115
 116         case BSS_TYPE_AP_BSS:
 117                 if (wlvif->wl->active_sta_count > 0)
 118                         active = true;
 119                 break;
 120
 121         default:
 122                 break;
 123         }
 124
 125         if (active)
 126                 (*count)++;
 127 }
 128
 129 static int wlcore_count_started_vifs(struct wl1271 *wl)
 130 {
 131         int count = 0;
 132
 133         ieee80211_iterate_active_interfaces_atomic(wl->hw,
 134                                         IEEE80211_IFACE_ITER_RESUME_ALL,
 135                                         wlcore_started_vifs_iter, &count);
 136         return count;
 137 }
 138
 139 static int
 140 wlcore_scan_get_channels(struct wl1271 *wl,
 141                          struct ieee80211_channel *req_channels[],
 142                          u32 n_channels,
 143                          u32 n_ssids,
 144                          struct conn_scan_ch_params *channels,
 145                          u32 band, bool radar, bool passive,
 146                          int start, int max_channels,
 147                          u8 *n_pactive_ch,
 148                          int scan_type)
 149 {
 150         int i, j;
 151         u32 flags;
 152         bool force_passive = !n_ssids;
 153         u32 min_dwell_time_active, max_dwell_time_active;
 154         u32 dwell_time_passive, dwell_time_dfs;
 155
 156         /* configure dwell times according to scan type */
 157         if (scan_type == SCAN_TYPE_SEARCH) {
 158                 struct conf_scan_settings *c = &wl->conf.scan;
 159                 bool active_vif_exists = !!wlcore_count_started_vifs(wl);
 160
 161                 min_dwell_time_active = active_vif_exists ?
 162                         c->min_dwell_time_active :
 163                         c->min_dwell_time_active_long;
 164                 max_dwell_time_active = active_vif_exists ?
 165                         c->max_dwell_time_active :
 166                         c->max_dwell_time_active_long;
 167                 dwell_time_passive = c->dwell_time_passive;
 168                 dwell_time_dfs = c->dwell_time_dfs;
 169         } else {
 170                 struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 171                 u32 delta_per_probe;
 172
 173                 if (band == NL80211_BAND_5GHZ)
 174                         delta_per_probe = c->dwell_time_delta_per_probe_5;
 175                 else
 176                         delta_per_probe = c->dwell_time_delta_per_probe;
 177
 178                 min_dwell_time_active = c->base_dwell_time +
 179                          n_ssids * c->num_probe_reqs * delta_per_probe;
 180
 181                 max_dwell_time_active = min_dwell_time_active +
 182                                         c->max_dwell_time_delta;
 183                 dwell_time_passive = c->dwell_time_passive;
 184                 dwell_time_dfs = c->dwell_time_dfs;
 185         }
 186         min_dwell_time_active = DIV_ROUND_UP(min_dwell_time_active, 1000);
 187         max_dwell_time_active = DIV_ROUND_UP(max_dwell_time_active, 1000);
 188         dwell_time_passive = DIV_ROUND_UP(dwell_time_passive, 1000);
 189         dwell_time_dfs = DIV_ROUND_UP(dwell_time_dfs, 1000);
 190
 191         for (i = 0, j = start;
 192              i < n_channels && j < max_channels;
 193              i++) {
 194                 flags = req_channels[i]->flags;
 195
 196                 if (force_passive)
 197                         flags |= IEEE80211_CHAN_NO_IR;
 198
 199                 if ((req_channels[i]->band == band) &&
 200                     !(flags & IEEE80211_CHAN_DISABLED) &&
 201                     (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
 202                     /* if radar is set, we ignore the passive flag */
 203                     (radar ||
 204                      !!(flags & IEEE80211_CHAN_NO_IR) == passive)) {
 205                         if (flags & IEEE80211_CHAN_RADAR) {
 206                                 channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
 207
 208                                 channels[j].passive_duration =
 209                                         cpu_to_le16(dwell_time_dfs);
 210                         } else {
 211                                 channels[j].passive_duration =
 212                                         cpu_to_le16(dwell_time_passive);
 213                         }
 214
 215                         channels[j].min_duration =
 216                                 cpu_to_le16(min_dwell_time_active);
 217                         channels[j].max_duration =
 218                                 cpu_to_le16(max_dwell_time_active);
 219
 220                         channels[j].tx_power_att = req_channels[i]->max_power;
 221                         channels[j].channel = req_channels[i]->hw_value;
 222
 223                         if (n_pactive_ch &&
 224                             (band == NL80211_BAND_2GHZ) &&
 225                             (channels[j].channel >= 12) &&
 226                             (channels[j].channel <= 14) &&
 227                             (flags & IEEE80211_CHAN_NO_IR) &&
 228                             !force_passive) {
 229                                 /* pactive channels treated as DFS */
 230                                 channels[j].flags = SCAN_CHANNEL_FLAGS_DFS;
 231
 232                                 /*
 233                                  * n_pactive_ch is counted down from the end of
 234                                  * the passive channel list
 235                                  */
 236                                 (*n_pactive_ch)++;
 237                                 wl1271_debug(DEBUG_SCAN, "n_pactive_ch = %d",
 238                                              *n_pactive_ch);
 239                         }
 240
 241                         wl1271_debug(DEBUG_SCAN, "freq %d, ch. %d, flags 0x%x, power %d, min/max_dwell %d/%d%s%s",
 242                                      req_channels[i]->center_freq,
 243                                      req_channels[i]->hw_value,
 244                                      req_channels[i]->flags,
 245                                      req_channels[i]->max_power,
 246                                      min_dwell_time_active,
 247                                      max_dwell_time_active,
 248                                      flags & IEEE80211_CHAN_RADAR ?
 249                                         ", DFS" : "",
 250                                      flags & IEEE80211_CHAN_NO_IR ?
 251                                         ", NO-IR" : "");
 252                         j++;
 253                 }
 254         }
 255
 256         return j - start;
 257 }
 258
 259 bool
 260 wlcore_set_scan_chan_params(struct wl1271 *wl,
 261                             struct wlcore_scan_channels *cfg,
 262                             struct ieee80211_channel *channels[],
 263                             u32 n_channels,
 264                             u32 n_ssids,
 265                             int scan_type)
 266 {
 267         u8 n_pactive_ch = 0;
 268
 269         cfg->passive[0] =
 270                 wlcore_scan_get_channels(wl,
 271                                          channels,
 272                                          n_channels,
 273                                          n_ssids,
 274                                          cfg->channels_2,
 275                                          NL80211_BAND_2GHZ,
 276                                          false, true, 0,
 277                                          MAX_CHANNELS_2GHZ,
 278                                          &n_pactive_ch,
 279                                          scan_type);
 280         cfg->active[0] =
 281                 wlcore_scan_get_channels(wl,
 282                                          channels,
 283                                          n_channels,
 284                                          n_ssids,
 285                                          cfg->channels_2,
 286                                          NL80211_BAND_2GHZ,
 287                                          false, false,
 288                                          cfg->passive[0],
 289                                          MAX_CHANNELS_2GHZ,
 290                                          &n_pactive_ch,
 291                                          scan_type);
 292         cfg->passive[1] =
 293                 wlcore_scan_get_channels(wl,
 294                                          channels,
 295                                          n_channels,
 296                                          n_ssids,
 297                                          cfg->channels_5,
 298                                          NL80211_BAND_5GHZ,
 299                                          false, true, 0,
 300                                          wl->max_channels_5,
 301                                          &n_pactive_ch,
 302                                          scan_type);
 303         cfg->dfs =
 304                 wlcore_scan_get_channels(wl,
 305                                          channels,
 306                                          n_channels,
 307                                          n_ssids,
 308                                          cfg->channels_5,
 309                                          NL80211_BAND_5GHZ,
 310                                          true, true,
 311                                          cfg->passive[1],
 312                                          wl->max_channels_5,
 313                                          &n_pactive_ch,
 314                                          scan_type);
 315         cfg->active[1] =
 316                 wlcore_scan_get_channels(wl,
 317                                          channels,
 318                                          n_channels,
 319                                          n_ssids,
 320                                          cfg->channels_5,
 321                                          NL80211_BAND_5GHZ,
 322                                          false, false,
 323                                          cfg->passive[1] + cfg->dfs,
 324                                          wl->max_channels_5,
 325                                          &n_pactive_ch,
 326                                          scan_type);
 327
 328         /* 802.11j channels are not supported yet */
 329         cfg->passive[2] = 0;
 330         cfg->active[2] = 0;
 331
 332         cfg->passive_active = n_pactive_ch;
 333
 334         wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
 335                      cfg->active[0], cfg->passive[0]);
 336         wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
 337                      cfg->active[1], cfg->passive[1]);
 338         wl1271_debug(DEBUG_SCAN, "    DFS: %d", cfg->dfs);
 339
 340         return  cfg->passive[0] || cfg->active[0] ||
 341                 cfg->passive[1] || cfg->active[1] || cfg->dfs ||
 342                 cfg->passive[2] || cfg->active[2];
 343 }
 344 EXPORT_SYMBOL_GPL(wlcore_set_scan_chan_params);
 345
 346 int wlcore_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
 347                 const u8 *ssid, size_t ssid_len,
 348                 struct cfg80211_scan_request *req)
 349 {
 350         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 351
 352         /*
 353          * cfg80211 should guarantee that we don't get more channels
 354          * than what we have registered.
 355          */
 356         BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
 357
 358         if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
 359                 return -EBUSY;
 360
 361         wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
 362
 363         if (ssid_len && ssid) {
 364                 wl->scan.ssid_len = ssid_len;
 365                 memcpy(wl->scan.ssid, ssid, ssid_len);
 366         } else {
 367                 wl->scan.ssid_len = 0;
 368         }
 369
 370         wl->scan_wlvif = wlvif;
 371         wl->scan.req = req;
 372         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
 373
 374         /* we assume failure so that timeout scenarios are handled correctly */
 375         wl->scan.failed = true;
 376         ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 377                                      msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
 378
 379         wl->ops->scan_start(wl, wlvif, req);
 380
 381         return 0;
 382 }
 383 /* Returns the scan type to be used or a negative value on error */
 384 int
 385 wlcore_scan_sched_scan_ssid_list(struct wl1271 *wl,
 386                                  struct wl12xx_vif *wlvif,
 387                                  struct cfg80211_sched_scan_request *req)
 388 {
 389         struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
 390         struct cfg80211_match_set *sets = req->match_sets;
 391         struct cfg80211_ssid *ssids = req->ssids;
 392         int ret = 0, type, i, j, n_match_ssids = 0;
 393
 394         wl1271_debug((DEBUG_CMD | DEBUG_SCAN), "cmd sched scan ssid list");
 395
 396         /* count the match sets that contain SSIDs */
 397         for (i = 0; i < req->n_match_sets; i++)
 398                 if (sets[i].ssid.ssid_len > 0)
 399                         n_match_ssids++;
 400
 401         /* No filter, no ssids or only bcast ssid */
 402         if (!n_match_ssids &&
 403             (!req->n_ssids ||
 404              (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
 405                 type = SCAN_SSID_FILTER_ANY;
 406                 goto out;
 407         }
 408
 409         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 410         if (!cmd) {
 411                 ret = -ENOMEM;
 412                 goto out;
 413         }
 414
 415         cmd->role_id = wlvif->role_id;
 416         if (!n_match_ssids) {
 417                 /* No filter, with ssids */
 418                 type = SCAN_SSID_FILTER_DISABLED;
 419
 420                 for (i = 0; i < req->n_ssids; i++) {
 421                         cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
 422                                 SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
 423                         cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
 424                         memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
 425                                ssids[i].ssid_len);
 426                         cmd->n_ssids++;
 427                 }
 428         } else {
 429                 type = SCAN_SSID_FILTER_LIST;
 430
 431                 /* Add all SSIDs from the filters */
 432                 for (i = 0; i < req->n_match_sets; i++) {
 433                         /* ignore sets without SSIDs */
 434                         if (!sets[i].ssid.ssid_len)
 435                                 continue;
 436
 437                         cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
 438                         cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
 439                         memcpy(cmd->ssids[cmd->n_ssids].ssid,
 440                                sets[i].ssid.ssid, sets[i].ssid.ssid_len);
 441                         cmd->n_ssids++;
 442                 }
 443                 if ((req->n_ssids > 1) ||
 444                     (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
 445                         /*
 446                          * Mark all the SSIDs passed in the SSID list as HIDDEN,
 447                          * so they're used in probe requests.
 448                          */
 449                         for (i = 0; i < req->n_ssids; i++) {
 450                                 if (!req->ssids[i].ssid_len)
 451                                         continue;
 452
 453                                 for (j = 0; j < cmd->n_ssids; j++)
 454                                         if ((req->ssids[i].ssid_len ==
 455                                              cmd->ssids[j].len) &&
 456                                             !memcmp(req->ssids[i].ssid,
 457                                                    cmd->ssids[j].ssid,
 458                                                    req->ssids[i].ssid_len)) {
 459                                                 cmd->ssids[j].type =
 460                                                         SCAN_SSID_TYPE_HIDDEN;
 461                                                 break;
 462                                         }
 463                                 /* Fail if SSID isn't present in the filters */
 464                                 if (j == cmd->n_ssids) {
 465                                         ret = -EINVAL;
 466                                         goto out_free;
 467                                 }
 468                         }
 469                 }
 470         }
 471
 472         ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
 473                               sizeof(*cmd), 0);
 474         if (ret < 0) {
 475                 wl1271_error("cmd sched scan ssid list failed");
 476                 goto out_free;
 477         }
 478
 479 out_free:
 480         kfree(cmd);
 481 out:
 482         if (ret < 0)
 483                 return ret;
 484         return type;
 485 }
 486 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_ssid_list);
 487
 488 void wlcore_scan_sched_scan_results(struct wl1271 *wl)
 489 {
 490         wl1271_debug(DEBUG_SCAN, "got periodic scan results");
 491
 492         ieee80211_sched_scan_results(wl->hw);
 493 }
 494 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_results);