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         ieee80211_scan_completed(wl->hw, false);
  84
  85 out:
  86         mutex_unlock(&wl->mutex);
  87
  88 }
  89
  90 static int
  91 wlcore_scan_get_channels(struct wl1271 *wl,
  92                          struct ieee80211_channel *req_channels[],
  93                          u32 n_channels,
  94                          u32 n_ssids,
  95                          struct conn_scan_ch_params *channels,
  96                          u32 band, bool radar, bool passive,
  97                          int start, int max_channels,
  98                          u8 *n_pactive_ch)
  99 {
 100         struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 101         int i, j;
 102         u32 flags;
 103         bool force_passive = !n_ssids;
 104         u32 min_dwell_time_active, max_dwell_time_active, delta_per_probe;
 105         u32 dwell_time_passive, dwell_time_dfs;
 106
 107         if (band == IEEE80211_BAND_5GHZ)
 108                 delta_per_probe = c->dwell_time_delta_per_probe_5;
 109         else
 110                 delta_per_probe = c->dwell_time_delta_per_probe;
 111
 112         min_dwell_time_active = c->base_dwell_time +
 113                  n_ssids * c->num_probe_reqs * delta_per_probe;
 114
 115         max_dwell_time_active = min_dwell_time_active + c->max_dwell_time_delta;
 116
 117         min_dwell_time_active = DIV_ROUND_UP(min_dwell_time_active, 1000);
 118         max_dwell_time_active = DIV_ROUND_UP(max_dwell_time_active, 1000);
 119         dwell_time_passive = DIV_ROUND_UP(c->dwell_time_passive, 1000);
 120         dwell_time_dfs = DIV_ROUND_UP(c->dwell_time_dfs, 1000);
 121
 122         for (i = 0, j = start;
 123              i < n_channels && j < max_channels;
 124              i++) {
 125                 flags = req_channels[i]->flags;
 126
 127                 if (force_passive)
 128                         flags |= IEEE80211_CHAN_PASSIVE_SCAN;
 129
 130                 if ((req_channels[i]->band == band) &&
 131                     !(flags & IEEE80211_CHAN_DISABLED) &&
 132                     (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
 133                     /* if radar is set, we ignore the passive flag */
 134                     (radar ||
 135                      !!(flags & IEEE80211_CHAN_PASSIVE_SCAN) == passive)) {
 136                         wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
 137                                      req_channels[i]->band,
 138                                      req_channels[i]->center_freq);
 139                         wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
 140                                      req_channels[i]->hw_value,
 141                                      req_channels[i]->flags);
 142                         wl1271_debug(DEBUG_SCAN, "max_power %d",
 143                                      req_channels[i]->max_power);
 144                         wl1271_debug(DEBUG_SCAN, "min_dwell_time %d max dwell time %d",
 145                                      min_dwell_time_active,
 146                                      max_dwell_time_active);
 147
 148                         if (flags & IEEE80211_CHAN_RADAR) {
 149                                 channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
 150
 151                                 channels[j].passive_duration =
 152                                         cpu_to_le16(dwell_time_dfs);
 153                         } else {
 154                                 channels[j].passive_duration =
 155                                         cpu_to_le16(dwell_time_passive);
 156                         }
 157
 158                         channels[j].min_duration =
 159                                 cpu_to_le16(min_dwell_time_active);
 160                         channels[j].max_duration =
 161                                 cpu_to_le16(max_dwell_time_active);
 162
 163                         channels[j].tx_power_att = req_channels[i]->max_power;
 164                         channels[j].channel = req_channels[i]->hw_value;
 165
 166                         if (n_pactive_ch &&
 167                             (band == IEEE80211_BAND_2GHZ) &&
 168                             (channels[j].channel >= 12) &&
 169                             (channels[j].channel <= 14) &&
 170                             (flags & IEEE80211_CHAN_PASSIVE_SCAN) &&
 171                             !force_passive) {
 172                                 /* pactive channels treated as DFS */
 173                                 channels[j].flags = SCAN_CHANNEL_FLAGS_DFS;
 174
 175                                 /*
 176                                  * n_pactive_ch is counted down from the end of
 177                                  * the passive channel list
 178                                  */
 179                                 (*n_pactive_ch)++;
 180                                 wl1271_debug(DEBUG_SCAN, "n_pactive_ch = %d",
 181                                              *n_pactive_ch);
 182                         }
 183
 184                         j++;
 185                 }
 186         }
 187
 188         return j - start;
 189 }
 190
 191 bool
 192 wlcore_set_scan_chan_params(struct wl1271 *wl,
 193                             struct wlcore_scan_channels *cfg,
 194                             struct ieee80211_channel *channels[],
 195                             u32 n_channels,
 196                             u32 n_ssids)
 197 {
 198         u8 n_pactive_ch = 0;
 199
 200         cfg->passive[0] =
 201                 wlcore_scan_get_channels(wl,
 202                                          channels,
 203                                          n_channels,
 204                                          n_ssids,
 205                                          cfg->channels_2,
 206                                          IEEE80211_BAND_2GHZ,
 207                                          false, true, 0,
 208                                          MAX_CHANNELS_2GHZ,
 209                                          &n_pactive_ch);
 210         cfg->active[0] =
 211                 wlcore_scan_get_channels(wl,
 212                                          channels,
 213                                          n_channels,
 214                                          n_ssids,
 215                                          cfg->channels_2,
 216                                          IEEE80211_BAND_2GHZ,
 217                                          false, false,
 218                                          cfg->passive[0],
 219                                          MAX_CHANNELS_2GHZ,
 220                                          &n_pactive_ch);
 221         cfg->passive[1] =
 222                 wlcore_scan_get_channels(wl,
 223                                          channels,
 224                                          n_channels,
 225                                          n_ssids,
 226                                          cfg->channels_5,
 227                                          IEEE80211_BAND_5GHZ,
 228                                          false, true, 0,
 229                                          wl->max_channels_5,
 230                                          &n_pactive_ch);
 231         cfg->dfs =
 232                 wlcore_scan_get_channels(wl,
 233                                          channels,
 234                                          n_channels,
 235                                          n_ssids,
 236                                          cfg->channels_5,
 237                                          IEEE80211_BAND_5GHZ,
 238                                          true, true,
 239                                          cfg->passive[1],
 240                                          wl->max_channels_5,
 241                                          &n_pactive_ch);
 242         cfg->active[1] =
 243                 wlcore_scan_get_channels(wl,
 244                                          channels,
 245                                          n_channels,
 246                                          n_ssids,
 247                                          cfg->channels_5,
 248                                          IEEE80211_BAND_5GHZ,
 249                                          false, false,
 250                                          cfg->passive[1] + cfg->dfs,
 251                                          wl->max_channels_5,
 252                                          &n_pactive_ch);
 253
 254         /* 802.11j channels are not supported yet */
 255         cfg->passive[2] = 0;
 256         cfg->active[2] = 0;
 257
 258         cfg->passive_active = n_pactive_ch;
 259
 260         wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
 261                      cfg->active[0], cfg->passive[0]);
 262         wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
 263                      cfg->active[1], cfg->passive[1]);
 264         wl1271_debug(DEBUG_SCAN, "    DFS: %d", cfg->dfs);
 265
 266         return  cfg->passive[0] || cfg->active[0] ||
 267                 cfg->passive[1] || cfg->active[1] || cfg->dfs ||
 268                 cfg->passive[2] || cfg->active[2];
 269 }
 270 EXPORT_SYMBOL_GPL(wlcore_set_scan_chan_params);
 271
 272 int wlcore_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
 273                 const u8 *ssid, size_t ssid_len,
 274                 struct cfg80211_scan_request *req)
 275 {
 276         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 277
 278         /*
 279          * cfg80211 should guarantee that we don't get more channels
 280          * than what we have registered.
 281          */
 282         BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
 283
 284         if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
 285                 return -EBUSY;
 286
 287         wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
 288
 289         if (ssid_len && ssid) {
 290                 wl->scan.ssid_len = ssid_len;
 291                 memcpy(wl->scan.ssid, ssid, ssid_len);
 292         } else {
 293                 wl->scan.ssid_len = 0;
 294         }
 295
 296         wl->scan_wlvif = wlvif;
 297         wl->scan.req = req;
 298         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
 299
 300         /* we assume failure so that timeout scenarios are handled correctly */
 301         wl->scan.failed = true;
 302         ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 303                                      msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
 304
 305         wl->ops->scan_start(wl, wlvif, req);
 306
 307         return 0;
 308 }
 309 /* Returns the scan type to be used or a negative value on error */
 310 int
 311 wlcore_scan_sched_scan_ssid_list(struct wl1271 *wl,
 312                                  struct wl12xx_vif *wlvif,
 313                                  struct cfg80211_sched_scan_request *req)
 314 {
 315         struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
 316         struct cfg80211_match_set *sets = req->match_sets;
 317         struct cfg80211_ssid *ssids = req->ssids;
 318         int ret = 0, type, i, j, n_match_ssids = 0;
 319
 320         wl1271_debug(DEBUG_CMD, "cmd sched scan ssid list");
 321
 322         /* count the match sets that contain SSIDs */
 323         for (i = 0; i < req->n_match_sets; i++)
 324                 if (sets[i].ssid.ssid_len > 0)
 325                         n_match_ssids++;
 326
 327         /* No filter, no ssids or only bcast ssid */
 328         if (!n_match_ssids &&
 329             (!req->n_ssids ||
 330              (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
 331                 type = SCAN_SSID_FILTER_ANY;
 332                 goto out;
 333         }
 334
 335         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 336         if (!cmd) {
 337                 ret = -ENOMEM;
 338                 goto out;
 339         }
 340
 341         cmd->role_id = wlvif->role_id;
 342         if (!n_match_ssids) {
 343                 /* No filter, with ssids */
 344                 type = SCAN_SSID_FILTER_DISABLED;
 345
 346                 for (i = 0; i < req->n_ssids; i++) {
 347                         cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
 348                                 SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
 349                         cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
 350                         memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
 351                                ssids[i].ssid_len);
 352                         cmd->n_ssids++;
 353                 }
 354         } else {
 355                 type = SCAN_SSID_FILTER_LIST;
 356
 357                 /* Add all SSIDs from the filters */
 358                 for (i = 0; i < req->n_match_sets; i++) {
 359                         /* ignore sets without SSIDs */
 360                         if (!sets[i].ssid.ssid_len)
 361                                 continue;
 362
 363                         cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
 364                         cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
 365                         memcpy(cmd->ssids[cmd->n_ssids].ssid,
 366                                sets[i].ssid.ssid, sets[i].ssid.ssid_len);
 367                         cmd->n_ssids++;
 368                 }
 369                 if ((req->n_ssids > 1) ||
 370                     (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
 371                         /*
 372                          * Mark all the SSIDs passed in the SSID list as HIDDEN,
 373                          * so they're used in probe requests.
 374                          */
 375                         for (i = 0; i < req->n_ssids; i++) {
 376                                 if (!req->ssids[i].ssid_len)
 377                                         continue;
 378
 379                                 for (j = 0; j < cmd->n_ssids; j++)
 380                                         if ((req->ssids[i].ssid_len ==
 381                                              cmd->ssids[j].len) &&
 382                                             !memcmp(req->ssids[i].ssid,
 383                                                    cmd->ssids[j].ssid,
 384                                                    req->ssids[i].ssid_len)) {
 385                                                 cmd->ssids[j].type =
 386                                                         SCAN_SSID_TYPE_HIDDEN;
 387                                                 break;
 388                                         }
 389                                 /* Fail if SSID isn't present in the filters */
 390                                 if (j == cmd->n_ssids) {
 391                                         ret = -EINVAL;
 392                                         goto out_free;
 393                                 }
 394                         }
 395                 }
 396         }
 397
 398         wl1271_dump(DEBUG_SCAN, "SSID_LIST: ", cmd, sizeof(*cmd));
 399
 400         ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
 401                               sizeof(*cmd), 0);
 402         if (ret < 0) {
 403                 wl1271_error("cmd sched scan ssid list failed");
 404                 goto out_free;
 405         }
 406
 407 out_free:
 408         kfree(cmd);
 409 out:
 410         if (ret < 0)
 411                 return ret;
 412         return type;
 413 }
 414 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_ssid_list);
 415
 416 void wl1271_scan_sched_scan_results(struct wl1271 *wl)
 417 {
 418         wl1271_debug(DEBUG_SCAN, "got periodic scan results");
 419
 420         ieee80211_sched_scan_results(wl->hw);
 421 }