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
 178
 179                         if (flags & IEEE80211_CHAN_RADAR) {
 180                                 channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
 181
 182                                 channels[j].passive_duration =
 183                                         cpu_to_le16(dwell_time_dfs);
 184                         } else {
 185                                 channels[j].passive_duration =
 186                                         cpu_to_le16(dwell_time_passive);
 187                         }
 188
 189                         channels[j].min_duration =
 190                                 cpu_to_le16(min_dwell_time_active);
 191                         channels[j].max_duration =
 192                                 cpu_to_le16(max_dwell_time_active);
 193
 194                         channels[j].tx_power_att = req_channels[i]->max_power;
 195                         channels[j].channel = req_channels[i]->hw_value;
 196
 197                         if (n_pactive_ch &&
 198                             (band == IEEE80211_BAND_2GHZ) &&
 199                             (channels[j].channel >= 12) &&
 200                             (channels[j].channel <= 14) &&
 201                             (flags & IEEE80211_CHAN_PASSIVE_SCAN) &&
 202                             !force_passive) {
 203                                 /* pactive channels treated as DFS */
 204                                 channels[j].flags = SCAN_CHANNEL_FLAGS_DFS;
 205
 206                                 /*
 207                                  * n_pactive_ch is counted down from the end of
 208                                  * the passive channel list
 209                                  */
 210                                 (*n_pactive_ch)++;
 211                                 wl1271_debug(DEBUG_SCAN, "n_pactive_ch = %d",
 212                                              *n_pactive_ch);
 213                         }
 214
 215                         wl1271_debug(DEBUG_SCAN, "freq %d, ch. %d, flags 0x%x, power %d, min/max_dwell %d/%d%s%s",
 216                                      req_channels[i]->center_freq,
 217                                      req_channels[i]->hw_value,
 218                                      req_channels[i]->flags,
 219                                      req_channels[i]->max_power,
 220                                      min_dwell_time_active,
 221                                      max_dwell_time_active,
 222                                      flags & IEEE80211_CHAN_RADAR ?
 223                                         ", DFS" : "",
 224                                      flags & IEEE80211_CHAN_PASSIVE_SCAN ?
 225                                         ", PASSIVE" : "");
 226                         j++;
 227                 }
 228         }
 229
 230         return j - start;
 231 }
 232
 233 bool
 234 wlcore_set_scan_chan_params(struct wl1271 *wl,
 235                             struct wlcore_scan_channels *cfg,
 236                             struct ieee80211_channel *channels[],
 237                             u32 n_channels,
 238                             u32 n_ssids,
 239                             int scan_type)
 240 {
 241         u8 n_pactive_ch = 0;
 242
 243         cfg->passive[0] =
 244                 wlcore_scan_get_channels(wl,
 245                                          channels,
 246                                          n_channels,
 247                                          n_ssids,
 248                                          cfg->channels_2,
 249                                          IEEE80211_BAND_2GHZ,
 250                                          false, true, 0,
 251                                          MAX_CHANNELS_2GHZ,
 252                                          &n_pactive_ch,
 253                                          scan_type);
 254         cfg->active[0] =
 255                 wlcore_scan_get_channels(wl,
 256                                          channels,
 257                                          n_channels,
 258                                          n_ssids,
 259                                          cfg->channels_2,
 260                                          IEEE80211_BAND_2GHZ,
 261                                          false, false,
 262                                          cfg->passive[0],
 263                                          MAX_CHANNELS_2GHZ,
 264                                          &n_pactive_ch,
 265                                          scan_type);
 266         cfg->passive[1] =
 267                 wlcore_scan_get_channels(wl,
 268                                          channels,
 269                                          n_channels,
 270                                          n_ssids,
 271                                          cfg->channels_5,
 272                                          IEEE80211_BAND_5GHZ,
 273                                          false, true, 0,
 274                                          wl->max_channels_5,
 275                                          &n_pactive_ch,
 276                                          scan_type);
 277         cfg->dfs =
 278                 wlcore_scan_get_channels(wl,
 279                                          channels,
 280                                          n_channels,
 281                                          n_ssids,
 282                                          cfg->channels_5,
 283                                          IEEE80211_BAND_5GHZ,
 284                                          true, true,
 285                                          cfg->passive[1],
 286                                          wl->max_channels_5,
 287                                          &n_pactive_ch,
 288                                          scan_type);
 289         cfg->active[1] =
 290                 wlcore_scan_get_channels(wl,
 291                                          channels,
 292                                          n_channels,
 293                                          n_ssids,
 294                                          cfg->channels_5,
 295                                          IEEE80211_BAND_5GHZ,
 296                                          false, false,
 297                                          cfg->passive[1] + cfg->dfs,
 298                                          wl->max_channels_5,
 299                                          &n_pactive_ch,
 300                                          scan_type);
 301
 302         /* 802.11j channels are not supported yet */
 303         cfg->passive[2] = 0;
 304         cfg->active[2] = 0;
 305
 306         cfg->passive_active = n_pactive_ch;
 307
 308         wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
 309                      cfg->active[0], cfg->passive[0]);
 310         wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
 311                      cfg->active[1], cfg->passive[1]);
 312         wl1271_debug(DEBUG_SCAN, "    DFS: %d", cfg->dfs);
 313
 314         return  cfg->passive[0] || cfg->active[0] ||
 315                 cfg->passive[1] || cfg->active[1] || cfg->dfs ||
 316                 cfg->passive[2] || cfg->active[2];
 317 }
 318 EXPORT_SYMBOL_GPL(wlcore_set_scan_chan_params);
 319
 320 int wlcore_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
 321                 const u8 *ssid, size_t ssid_len,
 322                 struct cfg80211_scan_request *req)
 323 {
 324         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 325
 326         /*
 327          * cfg80211 should guarantee that we don't get more channels
 328          * than what we have registered.
 329          */
 330         BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
 331
 332         if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
 333                 return -EBUSY;
 334
 335         wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
 336
 337         if (ssid_len && ssid) {
 338                 wl->scan.ssid_len = ssid_len;
 339                 memcpy(wl->scan.ssid, ssid, ssid_len);
 340         } else {
 341                 wl->scan.ssid_len = 0;
 342         }
 343
 344         wl->scan_wlvif = wlvif;
 345         wl->scan.req = req;
 346         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
 347
 348         /* we assume failure so that timeout scenarios are handled correctly */
 349         wl->scan.failed = true;
 350         ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 351                                      msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
 352
 353         wl->ops->scan_start(wl, wlvif, req);
 354
 355         return 0;
 356 }
 357 /* Returns the scan type to be used or a negative value on error */
 358 int
 359 wlcore_scan_sched_scan_ssid_list(struct wl1271 *wl,
 360                                  struct wl12xx_vif *wlvif,
 361                                  struct cfg80211_sched_scan_request *req)
 362 {
 363         struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
 364         struct cfg80211_match_set *sets = req->match_sets;
 365         struct cfg80211_ssid *ssids = req->ssids;
 366         int ret = 0, type, i, j, n_match_ssids = 0;
 367
 368         wl1271_debug((DEBUG_CMD | DEBUG_SCAN), "cmd sched scan ssid list");
 369
 370         /* count the match sets that contain SSIDs */
 371         for (i = 0; i < req->n_match_sets; i++)
 372                 if (sets[i].ssid.ssid_len > 0)
 373                         n_match_ssids++;
 374
 375         /* No filter, no ssids or only bcast ssid */
 376         if (!n_match_ssids &&
 377             (!req->n_ssids ||
 378              (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
 379                 type = SCAN_SSID_FILTER_ANY;
 380                 goto out;
 381         }
 382
 383         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 384         if (!cmd) {
 385                 ret = -ENOMEM;
 386                 goto out;
 387         }
 388
 389         cmd->role_id = wlvif->role_id;
 390         if (!n_match_ssids) {
 391                 /* No filter, with ssids */
 392                 type = SCAN_SSID_FILTER_DISABLED;
 393
 394                 for (i = 0; i < req->n_ssids; i++) {
 395                         cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
 396                                 SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
 397                         cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
 398                         memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
 399                                ssids[i].ssid_len);
 400                         cmd->n_ssids++;
 401                 }
 402         } else {
 403                 type = SCAN_SSID_FILTER_LIST;
 404
 405                 /* Add all SSIDs from the filters */
 406                 for (i = 0; i < req->n_match_sets; i++) {
 407                         /* ignore sets without SSIDs */
 408                         if (!sets[i].ssid.ssid_len)
 409                                 continue;
 410
 411                         cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
 412                         cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
 413                         memcpy(cmd->ssids[cmd->n_ssids].ssid,
 414                                sets[i].ssid.ssid, sets[i].ssid.ssid_len);
 415                         cmd->n_ssids++;
 416                 }
 417                 if ((req->n_ssids > 1) ||
 418                     (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
 419                         /*
 420                          * Mark all the SSIDs passed in the SSID list as HIDDEN,
 421                          * so they're used in probe requests.
 422                          */
 423                         for (i = 0; i < req->n_ssids; i++) {
 424                                 if (!req->ssids[i].ssid_len)
 425                                         continue;
 426
 427                                 for (j = 0; j < cmd->n_ssids; j++)
 428                                         if ((req->ssids[i].ssid_len ==
 429                                              cmd->ssids[j].len) &&
 430                                             !memcmp(req->ssids[i].ssid,
 431                                                    cmd->ssids[j].ssid,
 432                                                    req->ssids[i].ssid_len)) {
 433                                                 cmd->ssids[j].type =
 434                                                         SCAN_SSID_TYPE_HIDDEN;
 435                                                 break;
 436                                         }
 437                                 /* Fail if SSID isn't present in the filters */
 438                                 if (j == cmd->n_ssids) {
 439                                         ret = -EINVAL;
 440                                         goto out_free;
 441                                 }
 442                         }
 443                 }
 444         }
 445
 446         ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
 447                               sizeof(*cmd), 0);
 448         if (ret < 0) {
 449                 wl1271_error("cmd sched scan ssid list failed");
 450                 goto out_free;
 451         }
 452
 453 out_free:
 454         kfree(cmd);
 455 out:
 456         if (ret < 0)
 457                 return ret;
 458         return type;
 459 }
 460 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_ssid_list);
 461
 462 void wlcore_scan_sched_scan_results(struct wl1271 *wl)
 463 {
 464         wl1271_debug(DEBUG_SCAN, "got periodic scan results");
 465
 466         ieee80211_sched_scan_results(wl->hw);
 467 }
 468 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_results);