linux/drivers/net/wireless/ti/wl12xx/scan.c
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   1/*
   2 * This file is part of wl12xx
   3 *
   4 * Copyright (C) 2012 Texas Instruments. All rights reserved.
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * version 2 as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful, but
  11 * WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 * General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  18 * 02110-1301 USA
  19 *
  20 */
  21
  22#include <linux/ieee80211.h>
  23#include "scan.h"
  24#include "../wlcore/debug.h"
  25#include "../wlcore/tx.h"
  26
  27static int wl1271_get_scan_channels(struct wl1271 *wl,
  28                                    struct cfg80211_scan_request *req,
  29                                    struct basic_scan_channel_params *channels,
  30                                    enum nl80211_band band, bool passive)
  31{
  32        struct conf_scan_settings *c = &wl->conf.scan;
  33        int i, j;
  34        u32 flags;
  35
  36        for (i = 0, j = 0;
  37             i < req->n_channels && j < WL1271_SCAN_MAX_CHANNELS;
  38             i++) {
  39                flags = req->channels[i]->flags;
  40
  41                if (!test_bit(i, wl->scan.scanned_ch) &&
  42                    !(flags & IEEE80211_CHAN_DISABLED) &&
  43                    (req->channels[i]->band == band) &&
  44                    /*
  45                     * In passive scans, we scan all remaining
  46                     * channels, even if not marked as such.
  47                     * In active scans, we only scan channels not
  48                     * marked as passive.
  49                     */
  50                    (passive || !(flags & IEEE80211_CHAN_NO_IR))) {
  51                        wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
  52                                     req->channels[i]->band,
  53                                     req->channels[i]->center_freq);
  54                        wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
  55                                     req->channels[i]->hw_value,
  56                                     req->channels[i]->flags);
  57                        wl1271_debug(DEBUG_SCAN,
  58                                     "max_antenna_gain %d, max_power %d",
  59                                     req->channels[i]->max_antenna_gain,
  60                                     req->channels[i]->max_power);
  61                        wl1271_debug(DEBUG_SCAN, "beacon_found %d",
  62                                     req->channels[i]->beacon_found);
  63
  64                        if (!passive) {
  65                                channels[j].min_duration =
  66                                        cpu_to_le32(c->min_dwell_time_active);
  67                                channels[j].max_duration =
  68                                        cpu_to_le32(c->max_dwell_time_active);
  69                        } else {
  70                                channels[j].min_duration =
  71                                        cpu_to_le32(c->dwell_time_passive);
  72                                channels[j].max_duration =
  73                                        cpu_to_le32(c->dwell_time_passive);
  74                        }
  75                        channels[j].early_termination = 0;
  76                        channels[j].tx_power_att = req->channels[i]->max_power;
  77                        channels[j].channel = req->channels[i]->hw_value;
  78
  79                        memset(&channels[j].bssid_lsb, 0xff, 4);
  80                        memset(&channels[j].bssid_msb, 0xff, 2);
  81
  82                        /* Mark the channels we already used */
  83                        set_bit(i, wl->scan.scanned_ch);
  84
  85                        j++;
  86                }
  87        }
  88
  89        return j;
  90}
  91
  92#define WL1271_NOTHING_TO_SCAN 1
  93
  94static int wl1271_scan_send(struct wl1271 *wl, struct wl12xx_vif *wlvif,
  95                            enum nl80211_band band,
  96                            bool passive, u32 basic_rate)
  97{
  98        struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
  99        struct wl1271_cmd_scan *cmd;
 100        struct wl1271_cmd_trigger_scan_to *trigger;
 101        int ret;
 102        u16 scan_options = 0;
 103
 104        /* skip active scans if we don't have SSIDs */
 105        if (!passive && wl->scan.req->n_ssids == 0)
 106                return WL1271_NOTHING_TO_SCAN;
 107
 108        cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 109        trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
 110        if (!cmd || !trigger) {
 111                ret = -ENOMEM;
 112                goto out;
 113        }
 114
 115        if (wl->conf.scan.split_scan_timeout)
 116                scan_options |= WL1271_SCAN_OPT_SPLIT_SCAN;
 117
 118        if (passive)
 119                scan_options |= WL1271_SCAN_OPT_PASSIVE;
 120
 121        /* scan on the dev role if the regular one is not started */
 122        if (wlcore_is_p2p_mgmt(wlvif))
 123                cmd->params.role_id = wlvif->dev_role_id;
 124        else
 125                cmd->params.role_id = wlvif->role_id;
 126
 127        if (WARN_ON(cmd->params.role_id == WL12XX_INVALID_ROLE_ID)) {
 128                ret = -EINVAL;
 129                goto out;
 130        }
 131
 132        cmd->params.scan_options = cpu_to_le16(scan_options);
 133
 134        cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req,
 135                                                    cmd->channels,
 136                                                    band, passive);
 137        if (cmd->params.n_ch == 0) {
 138                ret = WL1271_NOTHING_TO_SCAN;
 139                goto out;
 140        }
 141
 142        cmd->params.tx_rate = cpu_to_le32(basic_rate);
 143        cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs;
 144        cmd->params.tid_trigger = CONF_TX_AC_ANY_TID;
 145        cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;
 146
 147        if (band == NL80211_BAND_2GHZ)
 148                cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ;
 149        else
 150                cmd->params.band = WL1271_SCAN_BAND_5_GHZ;
 151
 152        if (wl->scan.ssid_len) {
 153                cmd->params.ssid_len = wl->scan.ssid_len;
 154                memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len);
 155        }
 156
 157        memcpy(cmd->addr, vif->addr, ETH_ALEN);
 158
 159        ret = wl12xx_cmd_build_probe_req(wl, wlvif,
 160                                         cmd->params.role_id, band,
 161                                         wl->scan.ssid, wl->scan.ssid_len,
 162                                         wl->scan.req->ie,
 163                                         wl->scan.req->ie_len, NULL, 0, false);
 164        if (ret < 0) {
 165                wl1271_error("PROBE request template failed");
 166                goto out;
 167        }
 168
 169        trigger->timeout = cpu_to_le32(wl->conf.scan.split_scan_timeout);
 170        ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
 171                              sizeof(*trigger), 0);
 172        if (ret < 0) {
 173                wl1271_error("trigger scan to failed for hw scan");
 174                goto out;
 175        }
 176
 177        wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));
 178
 179        ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
 180        if (ret < 0) {
 181                wl1271_error("SCAN failed");
 182                goto out;
 183        }
 184
 185out:
 186        kfree(cmd);
 187        kfree(trigger);
 188        return ret;
 189}
 190
 191int wl12xx_scan_stop(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 192{
 193        struct wl1271_cmd_header *cmd = NULL;
 194        int ret = 0;
 195
 196        if (WARN_ON(wl->scan.state == WL1271_SCAN_STATE_IDLE))
 197                return -EINVAL;
 198
 199        wl1271_debug(DEBUG_CMD, "cmd scan stop");
 200
 201        cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 202        if (!cmd) {
 203                ret = -ENOMEM;
 204                goto out;
 205        }
 206
 207        ret = wl1271_cmd_send(wl, CMD_STOP_SCAN, cmd,
 208                              sizeof(*cmd), 0);
 209        if (ret < 0) {
 210                wl1271_error("cmd stop_scan failed");
 211                goto out;
 212        }
 213out:
 214        kfree(cmd);
 215        return ret;
 216}
 217
 218void wl1271_scan_stm(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 219{
 220        int ret = 0;
 221        enum nl80211_band band;
 222        u32 rate, mask;
 223
 224        switch (wl->scan.state) {
 225        case WL1271_SCAN_STATE_IDLE:
 226                break;
 227
 228        case WL1271_SCAN_STATE_2GHZ_ACTIVE:
 229                band = NL80211_BAND_2GHZ;
 230                mask = wlvif->bitrate_masks[band];
 231                if (wl->scan.req->no_cck) {
 232                        mask &= ~CONF_TX_CCK_RATES;
 233                        if (!mask)
 234                                mask = CONF_TX_RATE_MASK_BASIC_P2P;
 235                }
 236                rate = wl1271_tx_min_rate_get(wl, mask);
 237                ret = wl1271_scan_send(wl, wlvif, band, false, rate);
 238                if (ret == WL1271_NOTHING_TO_SCAN) {
 239                        wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE;
 240                        wl1271_scan_stm(wl, wlvif);
 241                }
 242
 243                break;
 244
 245        case WL1271_SCAN_STATE_2GHZ_PASSIVE:
 246                band = NL80211_BAND_2GHZ;
 247                mask = wlvif->bitrate_masks[band];
 248                if (wl->scan.req->no_cck) {
 249                        mask &= ~CONF_TX_CCK_RATES;
 250                        if (!mask)
 251                                mask = CONF_TX_RATE_MASK_BASIC_P2P;
 252                }
 253                rate = wl1271_tx_min_rate_get(wl, mask);
 254                ret = wl1271_scan_send(wl, wlvif, band, true, rate);
 255                if (ret == WL1271_NOTHING_TO_SCAN) {
 256                        if (wl->enable_11a)
 257                                wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE;
 258                        else
 259                                wl->scan.state = WL1271_SCAN_STATE_DONE;
 260                        wl1271_scan_stm(wl, wlvif);
 261                }
 262
 263                break;
 264
 265        case WL1271_SCAN_STATE_5GHZ_ACTIVE:
 266                band = NL80211_BAND_5GHZ;
 267                rate = wl1271_tx_min_rate_get(wl, wlvif->bitrate_masks[band]);
 268                ret = wl1271_scan_send(wl, wlvif, band, false, rate);
 269                if (ret == WL1271_NOTHING_TO_SCAN) {
 270                        wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE;
 271                        wl1271_scan_stm(wl, wlvif);
 272                }
 273
 274                break;
 275
 276        case WL1271_SCAN_STATE_5GHZ_PASSIVE:
 277                band = NL80211_BAND_5GHZ;
 278                rate = wl1271_tx_min_rate_get(wl, wlvif->bitrate_masks[band]);
 279                ret = wl1271_scan_send(wl, wlvif, band, true, rate);
 280                if (ret == WL1271_NOTHING_TO_SCAN) {
 281                        wl->scan.state = WL1271_SCAN_STATE_DONE;
 282                        wl1271_scan_stm(wl, wlvif);
 283                }
 284
 285                break;
 286
 287        case WL1271_SCAN_STATE_DONE:
 288                wl->scan.failed = false;
 289                cancel_delayed_work(&wl->scan_complete_work);
 290                ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 291                                             msecs_to_jiffies(0));
 292                break;
 293
 294        default:
 295                wl1271_error("invalid scan state");
 296                break;
 297        }
 298
 299        if (ret < 0) {
 300                cancel_delayed_work(&wl->scan_complete_work);
 301                ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 302                                             msecs_to_jiffies(0));
 303        }
 304}
 305
 306static void wl12xx_adjust_channels(struct wl1271_cmd_sched_scan_config *cmd,
 307                                   struct wlcore_scan_channels *cmd_channels)
 308{
 309        memcpy(cmd->passive, cmd_channels->passive, sizeof(cmd->passive));
 310        memcpy(cmd->active, cmd_channels->active, sizeof(cmd->active));
 311        cmd->dfs = cmd_channels->dfs;
 312        cmd->n_pactive_ch = cmd_channels->passive_active;
 313
 314        memcpy(cmd->channels_2, cmd_channels->channels_2,
 315               sizeof(cmd->channels_2));
 316        memcpy(cmd->channels_5, cmd_channels->channels_5,
 317               sizeof(cmd->channels_5));
 318        /* channels_4 are not supported, so no need to copy them */
 319}
 320
 321int wl1271_scan_sched_scan_config(struct wl1271 *wl,
 322                                  struct wl12xx_vif *wlvif,
 323                                  struct cfg80211_sched_scan_request *req,
 324                                  struct ieee80211_scan_ies *ies)
 325{
 326        struct wl1271_cmd_sched_scan_config *cfg = NULL;
 327        struct wlcore_scan_channels *cfg_channels = NULL;
 328        struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 329        int i, ret;
 330        bool force_passive = !req->n_ssids;
 331
 332        wl1271_debug(DEBUG_CMD, "cmd sched_scan scan config");
 333
 334        cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
 335        if (!cfg)
 336                return -ENOMEM;
 337
 338        cfg->role_id = wlvif->role_id;
 339        cfg->rssi_threshold = c->rssi_threshold;
 340        cfg->snr_threshold  = c->snr_threshold;
 341        cfg->n_probe_reqs = c->num_probe_reqs;
 342        /* cycles set to 0 it means infinite (until manually stopped) */
 343        cfg->cycles = 0;
 344        /* report APs when at least 1 is found */
 345        cfg->report_after = 1;
 346        /* don't stop scanning automatically when something is found */
 347        cfg->terminate = 0;
 348        cfg->tag = WL1271_SCAN_DEFAULT_TAG;
 349        /* don't filter on BSS type */
 350        cfg->bss_type = SCAN_BSS_TYPE_ANY;
 351        /* currently NL80211 supports only a single interval */
 352        for (i = 0; i < SCAN_MAX_CYCLE_INTERVALS; i++)
 353                cfg->intervals[i] = cpu_to_le32(req->scan_plans[0].interval *
 354                                                MSEC_PER_SEC);
 355
 356        cfg->ssid_len = 0;
 357        ret = wlcore_scan_sched_scan_ssid_list(wl, wlvif, req);
 358        if (ret < 0)
 359                goto out;
 360
 361        cfg->filter_type = ret;
 362
 363        wl1271_debug(DEBUG_SCAN, "filter_type = %d", cfg->filter_type);
 364
 365        cfg_channels = kzalloc(sizeof(*cfg_channels), GFP_KERNEL);
 366        if (!cfg_channels) {
 367                ret = -ENOMEM;
 368                goto out;
 369        }
 370
 371        if (!wlcore_set_scan_chan_params(wl, cfg_channels, req->channels,
 372                                         req->n_channels, req->n_ssids,
 373                                         SCAN_TYPE_PERIODIC)) {
 374                wl1271_error("scan channel list is empty");
 375                ret = -EINVAL;
 376                goto out;
 377        }
 378        wl12xx_adjust_channels(cfg, cfg_channels);
 379
 380        if (!force_passive && cfg->active[0]) {
 381                u8 band = NL80211_BAND_2GHZ;
 382                ret = wl12xx_cmd_build_probe_req(wl, wlvif,
 383                                                 wlvif->role_id, band,
 384                                                 req->ssids[0].ssid,
 385                                                 req->ssids[0].ssid_len,
 386                                                 ies->ies[band],
 387                                                 ies->len[band],
 388                                                 ies->common_ies,
 389                                                 ies->common_ie_len,
 390                                                 true);
 391                if (ret < 0) {
 392                        wl1271_error("2.4GHz PROBE request template failed");
 393                        goto out;
 394                }
 395        }
 396
 397        if (!force_passive && cfg->active[1]) {
 398                u8 band = NL80211_BAND_5GHZ;
 399                ret = wl12xx_cmd_build_probe_req(wl, wlvif,
 400                                                 wlvif->role_id, band,
 401                                                 req->ssids[0].ssid,
 402                                                 req->ssids[0].ssid_len,
 403                                                 ies->ies[band],
 404                                                 ies->len[band],
 405                                                 ies->common_ies,
 406                                                 ies->common_ie_len,
 407                                                 true);
 408                if (ret < 0) {
 409                        wl1271_error("5GHz PROBE request template failed");
 410                        goto out;
 411                }
 412        }
 413
 414        wl1271_dump(DEBUG_SCAN, "SCAN_CFG: ", cfg, sizeof(*cfg));
 415
 416        ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_CFG, cfg,
 417                              sizeof(*cfg), 0);
 418        if (ret < 0) {
 419                wl1271_error("SCAN configuration failed");
 420                goto out;
 421        }
 422out:
 423        kfree(cfg_channels);
 424        kfree(cfg);
 425        return ret;
 426}
 427
 428int wl1271_scan_sched_scan_start(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 429{
 430        struct wl1271_cmd_sched_scan_start *start;
 431        int ret = 0;
 432
 433        wl1271_debug(DEBUG_CMD, "cmd periodic scan start");
 434
 435        if (wlvif->bss_type != BSS_TYPE_STA_BSS)
 436                return -EOPNOTSUPP;
 437
 438        if ((wl->quirks & WLCORE_QUIRK_NO_SCHED_SCAN_WHILE_CONN) &&
 439            test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags))
 440                return -EBUSY;
 441
 442        start = kzalloc(sizeof(*start), GFP_KERNEL);
 443        if (!start)
 444                return -ENOMEM;
 445
 446        start->role_id = wlvif->role_id;
 447        start->tag = WL1271_SCAN_DEFAULT_TAG;
 448
 449        ret = wl1271_cmd_send(wl, CMD_START_PERIODIC_SCAN, start,
 450                              sizeof(*start), 0);
 451        if (ret < 0) {
 452                wl1271_error("failed to send scan start command");
 453                goto out_free;
 454        }
 455
 456out_free:
 457        kfree(start);
 458        return ret;
 459}
 460
 461int wl12xx_sched_scan_start(struct wl1271 *wl, struct wl12xx_vif  *wlvif,
 462                            struct cfg80211_sched_scan_request *req,
 463                            struct ieee80211_scan_ies *ies)
 464{
 465        int ret;
 466
 467        ret = wl1271_scan_sched_scan_config(wl, wlvif, req, ies);
 468        if (ret < 0)
 469                return ret;
 470
 471        return wl1271_scan_sched_scan_start(wl, wlvif);
 472}
 473
 474void wl12xx_scan_sched_scan_stop(struct wl1271 *wl,  struct wl12xx_vif *wlvif)
 475{
 476        struct wl1271_cmd_sched_scan_stop *stop;
 477        int ret = 0;
 478
 479        wl1271_debug(DEBUG_CMD, "cmd periodic scan stop");
 480
 481        /* FIXME: what to do if alloc'ing to stop fails? */
 482        stop = kzalloc(sizeof(*stop), GFP_KERNEL);
 483        if (!stop) {
 484                wl1271_error("failed to alloc memory to send sched scan stop");
 485                return;
 486        }
 487
 488        stop->role_id = wlvif->role_id;
 489        stop->tag = WL1271_SCAN_DEFAULT_TAG;
 490
 491        ret = wl1271_cmd_send(wl, CMD_STOP_PERIODIC_SCAN, stop,
 492                              sizeof(*stop), 0);
 493        if (ret < 0) {
 494                wl1271_error("failed to send sched scan stop command");
 495                goto out_free;
 496        }
 497
 498out_free:
 499        kfree(stop);
 500}
 501
 502int wl12xx_scan_start(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 503                      struct cfg80211_scan_request *req)
 504{
 505        wl1271_scan_stm(wl, wlvif);
 506        return 0;
 507}
 508
 509void wl12xx_scan_completed(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 510{
 511        wl1271_scan_stm(wl, wlvif);
 512}
 513