LXR linux/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
  34void 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 = wl1271_ps_elp_wakeup(wl);
  71        if (ret < 0)
  72                goto out;
  73
  74        if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags)) {
  75                /* restore hardware connection monitoring template */
  76                wl1271_cmd_build_ap_probe_req(wl, wlvif, wlvif->probereq);
  77        }
  78
  79        wl1271_ps_elp_sleep(wl);
  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        ieee80211_scan_completed(wl->hw, &info);
  89
  90out:
  91        mutex_unlock(&wl->mutex);
  92
  93}
  94
  95static void wlcore_started_vifs_iter(void *data, u8 *mac,
  96                                     struct ieee80211_vif *vif)
  97{
  98        struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
  99        bool active = false;
 100        int *count = (int *)data;
 101
 102        /*
 103         * count active interfaces according to interface type.
 104         * checking only bss_conf.idle is bad for some cases, e.g.
 105         * we don't want to count sta in p2p_find as active interface.
 106         */
 107        switch (wlvif->bss_type) {
 108        case BSS_TYPE_STA_BSS:
 109                if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags))
 110                        active = true;
 111                break;
 112
 113        case BSS_TYPE_AP_BSS:
 114                if (wlvif->wl->active_sta_count > 0)
 115                        active = true;
 116                break;
 117
 118        default:
 119                break;
 120        }
 121
 122        if (active)
 123                (*count)++;
 124}
 125
 126static int wlcore_count_started_vifs(struct wl1271 *wl)
 127{
 128        int count = 0;
 129
 130        ieee80211_iterate_active_interfaces_atomic(wl->hw,
 131                                        IEEE80211_IFACE_ITER_RESUME_ALL,
 132                                        wlcore_started_vifs_iter, &count);
 133        return count;
 134}
 135
 136static int
 137wlcore_scan_get_channels(struct wl1271 *wl,
 138                         struct ieee80211_channel *req_channels[],
 139                         u32 n_channels,
 140                         u32 n_ssids,
 141                         struct conn_scan_ch_params *channels,
 142                         u32 band, bool radar, bool passive,
 143                         int start, int max_channels,
 144                         u8 *n_pactive_ch,
 145                         int scan_type)
 146{
 147        int i, j;
 148        u32 flags;
 149        bool force_passive = !n_ssids;
 150        u32 min_dwell_time_active, max_dwell_time_active;
 151        u32 dwell_time_passive, dwell_time_dfs;
 152
 153        /* configure dwell times according to scan type */
 154        if (scan_type == SCAN_TYPE_SEARCH) {
 155                struct conf_scan_settings *c = &wl->conf.scan;
 156                bool active_vif_exists = !!wlcore_count_started_vifs(wl);
 157
 158                min_dwell_time_active = active_vif_exists ?
 159                        c->min_dwell_time_active :
 160                        c->min_dwell_time_active_long;
 161                max_dwell_time_active = active_vif_exists ?
 162                        c->max_dwell_time_active :
 163                        c->max_dwell_time_active_long;
 164                dwell_time_passive = c->dwell_time_passive;
 165                dwell_time_dfs = c->dwell_time_dfs;
 166        } else {
 167                struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 168                u32 delta_per_probe;
 169
 170                if (band == NL80211_BAND_5GHZ)
 171                        delta_per_probe = c->dwell_time_delta_per_probe_5;
 172                else
 173                        delta_per_probe = c->dwell_time_delta_per_probe;
 174
 175                min_dwell_time_active = c->base_dwell_time +
 176                         n_ssids * c->num_probe_reqs * delta_per_probe;
 177
 178                max_dwell_time_active = min_dwell_time_active +
 179                                        c->max_dwell_time_delta;
 180                dwell_time_passive = c->dwell_time_passive;
 181                dwell_time_dfs = c->dwell_time_dfs;
 182        }
 183        min_dwell_time_active = DIV_ROUND_UP(min_dwell_time_active, 1000);
 184        max_dwell_time_active = DIV_ROUND_UP(max_dwell_time_active, 1000);
 185        dwell_time_passive = DIV_ROUND_UP(dwell_time_passive, 1000);
 186        dwell_time_dfs = DIV_ROUND_UP(dwell_time_dfs, 1000);
 187
 188        for (i = 0, j = start;
 189             i < n_channels && j < max_channels;
 190             i++) {
 191                flags = req_channels[i]->flags;
 192
 193                if (force_passive)
 194                        flags |= IEEE80211_CHAN_NO_IR;
 195
 196                if ((req_channels[i]->band == band) &&
 197                    !(flags & IEEE80211_CHAN_DISABLED) &&
 198                    (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
 199                    /* if radar is set, we ignore the passive flag */
 200                    (radar ||
 201                     !!(flags & IEEE80211_CHAN_NO_IR) == passive)) {
 202                        if (flags & IEEE80211_CHAN_RADAR) {
 203                                channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
 204
 205                                channels[j].passive_duration =
 206                                        cpu_to_le16(dwell_time_dfs);
 207                        } else {
 208                                channels[j].passive_duration =
 209                                        cpu_to_le16(dwell_time_passive);
 210                        }
 211
 212                        channels[j].min_duration =
 213                                cpu_to_le16(min_dwell_time_active);
 214                        channels[j].max_duration =
 215                                cpu_to_le16(max_dwell_time_active);
 216
 217                        channels[j].tx_power_att = req_channels[i]->max_power;
 218                        channels[j].channel = req_channels[i]->hw_value;
 219
 220                        if (n_pactive_ch &&
 221                            (band == NL80211_BAND_2GHZ) &&
 222                            (channels[j].channel >= 12) &&
 223                            (channels[j].channel <= 14) &&
 224                            (flags & IEEE80211_CHAN_NO_IR) &&
 225                            !force_passive) {
 226                                /* pactive channels treated as DFS */
 227                                channels[j].flags = SCAN_CHANNEL_FLAGS_DFS;
 228
 229                                /*
 230                                 * n_pactive_ch is counted down from the end of
 231                                 * the passive channel list
 232                                 */
 233                                (*n_pactive_ch)++;
 234                                wl1271_debug(DEBUG_SCAN, "n_pactive_ch = %d",
 235                                             *n_pactive_ch);
 236                        }
 237
 238                        wl1271_debug(DEBUG_SCAN, "freq %d, ch. %d, flags 0x%x, power %d, min/max_dwell %d/%d%s%s",
 239                                     req_channels[i]->center_freq,
 240                                     req_channels[i]->hw_value,
 241                                     req_channels[i]->flags,
 242                                     req_channels[i]->max_power,
 243                                     min_dwell_time_active,
 244                                     max_dwell_time_active,
 245                                     flags & IEEE80211_CHAN_RADAR ?
 246                                        ", DFS" : "",
 247                                     flags & IEEE80211_CHAN_NO_IR ?
 248                                        ", NO-IR" : "");
 249                        j++;
 250                }
 251        }
 252
 253        return j - start;
 254}
 255
 256bool
 257wlcore_set_scan_chan_params(struct wl1271 *wl,
 258                            struct wlcore_scan_channels *cfg,
 259                            struct ieee80211_channel *channels[],
 260                            u32 n_channels,
 261                            u32 n_ssids,
 262                            int scan_type)
 263{
 264        u8 n_pactive_ch = 0;
 265
 266        cfg->passive[0] =
 267                wlcore_scan_get_channels(wl,
 268                                         channels,
 269                                         n_channels,
 270                                         n_ssids,
 271                                         cfg->channels_2,
 272                                         NL80211_BAND_2GHZ,
 273                                         false, true, 0,
 274                                         MAX_CHANNELS_2GHZ,
 275                                         &n_pactive_ch,
 276                                         scan_type);
 277        cfg->active[0] =
 278                wlcore_scan_get_channels(wl,
 279                                         channels,
 280                                         n_channels,
 281                                         n_ssids,
 282                                         cfg->channels_2,
 283                                         NL80211_BAND_2GHZ,
 284                                         false, false,
 285                                         cfg->passive[0],
 286                                         MAX_CHANNELS_2GHZ,
 287                                         &n_pactive_ch,
 288                                         scan_type);
 289        cfg->passive[1] =
 290                wlcore_scan_get_channels(wl,
 291                                         channels,
 292                                         n_channels,
 293                                         n_ssids,
 294                                         cfg->channels_5,
 295                                         NL80211_BAND_5GHZ,
 296                                         false, true, 0,
 297                                         wl->max_channels_5,
 298                                         &n_pactive_ch,
 299                                         scan_type);
 300        cfg->dfs =
 301                wlcore_scan_get_channels(wl,
 302                                         channels,
 303                                         n_channels,
 304                                         n_ssids,
 305                                         cfg->channels_5,
 306                                         NL80211_BAND_5GHZ,
 307                                         true, true,
 308                                         cfg->passive[1],
 309                                         wl->max_channels_5,
 310                                         &n_pactive_ch,
 311                                         scan_type);
 312        cfg->active[1] =
 313                wlcore_scan_get_channels(wl,
 314                                         channels,
 315                                         n_channels,
 316                                         n_ssids,
 317                                         cfg->channels_5,
 318                                         NL80211_BAND_5GHZ,
 319                                         false, false,
 320                                         cfg->passive[1] + cfg->dfs,
 321                                         wl->max_channels_5,
 322                                         &n_pactive_ch,
 323                                         scan_type);
 324
 325        /* 802.11j channels are not supported yet */
 326        cfg->passive[2] = 0;
 327        cfg->active[2] = 0;
 328
 329        cfg->passive_active = n_pactive_ch;
 330
 331        wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
 332                     cfg->active[0], cfg->passive[0]);
 333        wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
 334                     cfg->active[1], cfg->passive[1]);
 335        wl1271_debug(DEBUG_SCAN, "    DFS: %d", cfg->dfs);
 336
 337        return  cfg->passive[0] || cfg->active[0] ||
 338                cfg->passive[1] || cfg->active[1] || cfg->dfs ||
 339                cfg->passive[2] || cfg->active[2];
 340}
 341EXPORT_SYMBOL_GPL(wlcore_set_scan_chan_params);
 342
 343int wlcore_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
 344                const u8 *ssid, size_t ssid_len,
 345                struct cfg80211_scan_request *req)
 346{
 347        struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 348
 349        /*
 350         * cfg80211 should guarantee that we don't get more channels
 351         * than what we have registered.
 352         */
 353        BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
 354
 355        if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
 356                return -EBUSY;
 357
 358        wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
 359
 360        if (ssid_len && ssid) {
 361                wl->scan.ssid_len = ssid_len;
 362                memcpy(wl->scan.ssid, ssid, ssid_len);
 363        } else {
 364                wl->scan.ssid_len = 0;
 365        }
 366
 367        wl->scan_wlvif = wlvif;
 368        wl->scan.req = req;
 369        memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
 370
 371        /* we assume failure so that timeout scenarios are handled correctly */
 372        wl->scan.failed = true;
 373        ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 374                                     msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
 375
 376        wl->ops->scan_start(wl, wlvif, req);
 377
 378        return 0;
 379}
 380/* Returns the scan type to be used or a negative value on error */
 381int
 382wlcore_scan_sched_scan_ssid_list(struct wl1271 *wl,
 383                                 struct wl12xx_vif *wlvif,
 384                                 struct cfg80211_sched_scan_request *req)
 385{
 386        struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
 387        struct cfg80211_match_set *sets = req->match_sets;
 388        struct cfg80211_ssid *ssids = req->ssids;
 389        int ret = 0, type, i, j, n_match_ssids = 0;
 390
 391        wl1271_debug((DEBUG_CMD | DEBUG_SCAN), "cmd sched scan ssid list");
 392
 393        /* count the match sets that contain SSIDs */
 394        for (i = 0; i < req->n_match_sets; i++)
 395                if (sets[i].ssid.ssid_len > 0)
 396                        n_match_ssids++;
 397
 398        /* No filter, no ssids or only bcast ssid */
 399        if (!n_match_ssids &&
 400            (!req->n_ssids ||
 401             (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
 402                type = SCAN_SSID_FILTER_ANY;
 403                goto out;
 404        }
 405
 406        cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 407        if (!cmd) {
 408                ret = -ENOMEM;
 409                goto out;
 410        }
 411
 412        cmd->role_id = wlvif->role_id;
 413        if (!n_match_ssids) {
 414                /* No filter, with ssids */
 415                type = SCAN_SSID_FILTER_DISABLED;
 416
 417                for (i = 0; i < req->n_ssids; i++) {
 418                        cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
 419                                SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
 420                        cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
 421                        memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
 422                               ssids[i].ssid_len);
 423                        cmd->n_ssids++;
 424                }
 425        } else {
 426                type = SCAN_SSID_FILTER_LIST;
 427
 428                /* Add all SSIDs from the filters */
 429                for (i = 0; i < req->n_match_sets; i++) {
 430                        /* ignore sets without SSIDs */
 431                        if (!sets[i].ssid.ssid_len)
 432                                continue;
 433
 434                        cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
 435                        cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
 436                        memcpy(cmd->ssids[cmd->n_ssids].ssid,
 437                               sets[i].ssid.ssid, sets[i].ssid.ssid_len);
 438                        cmd->n_ssids++;
 439                }
 440                if ((req->n_ssids > 1) ||
 441                    (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
 442                        /*
 443                         * Mark all the SSIDs passed in the SSID list as HIDDEN,
 444                         * so they're used in probe requests.
 445                         */
 446                        for (i = 0; i < req->n_ssids; i++) {
 447                                if (!req->ssids[i].ssid_len)
 448                                        continue;
 449
 450                                for (j = 0; j < cmd->n_ssids; j++)
 451                                        if ((req->ssids[i].ssid_len ==
 452                                             cmd->ssids[j].len) &&
 453                                            !memcmp(req->ssids[i].ssid,
 454                                                   cmd->ssids[j].ssid,
 455                                                   req->ssids[i].ssid_len)) {
 456                                                cmd->ssids[j].type =
 457                                                        SCAN_SSID_TYPE_HIDDEN;
 458                                                break;
 459                                        }
 460                                /* Fail if SSID isn't present in the filters */
 461                                if (j == cmd->n_ssids) {
 462                                        ret = -EINVAL;
 463                                        goto out_free;
 464                                }
 465                        }
 466                }
 467        }
 468
 469        ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
 470                              sizeof(*cmd), 0);
 471        if (ret < 0) {
 472                wl1271_error("cmd sched scan ssid list failed");
 473                goto out_free;
 474        }
 475
 476out_free:
 477        kfree(cmd);
 478out:
 479        if (ret < 0)
 480                return ret;
 481        return type;
 482}
 483EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_ssid_list);
 484
 485void wlcore_scan_sched_scan_results(struct wl1271 *wl)
 486{
 487        wl1271_debug(DEBUG_SCAN, "got periodic scan results");
 488
 489        ieee80211_sched_scan_results(wl->hw);
 490}
 491EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_results);
 492