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#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
  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 = 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
  93out:
  94        mutex_unlock(&wl->mutex);
  95
  96}
  97
  98static 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
 129static 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
 139static int
 140wlcore_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
 259bool
 260wlcore_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}
 344EXPORT_SYMBOL_GPL(wlcore_set_scan_chan_params);
 345
 346int 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 */
 384int
 385wlcore_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
 479out_free:
 480        kfree(cmd);
 481out:
 482        if (ret < 0)
 483                return ret;
 484        return type;
 485}
 486EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_ssid_list);
 487
 488void 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}
 494EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_results);
 495