drivers/net/wireless/ti/wl18xx/scan.c

   1 /*
   2  * This file is part of wl18xx
   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
  26 static void wl18xx_adjust_channels(struct wl18xx_cmd_scan_params *cmd,
  27                                    struct wlcore_scan_channels *cmd_channels)
  28 {
  29         memcpy(cmd->passive, cmd_channels->passive, sizeof(cmd->passive));
  30         memcpy(cmd->active, cmd_channels->active, sizeof(cmd->active));
  31         cmd->dfs = cmd_channels->dfs;
  32         cmd->passive_active = cmd_channels->passive_active;
  33
  34         memcpy(cmd->channels_2, cmd_channels->channels_2,
  35                sizeof(cmd->channels_2));
  36         memcpy(cmd->channels_5, cmd_channels->channels_5,
  37                sizeof(cmd->channels_5));
  38         /* channels_4 are not supported, so no need to copy them */
  39 }
  40
  41 static int wl18xx_scan_send(struct wl1271 *wl, struct wl12xx_vif *wlvif,
  42                             struct cfg80211_scan_request *req)
  43 {
  44         struct wl18xx_cmd_scan_params *cmd;
  45         struct wlcore_scan_channels *cmd_channels = NULL;
  46         int ret;
  47
  48         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
  49         if (!cmd) {
  50                 ret = -ENOMEM;
  51                 goto out;
  52         }
  53
  54         /* scan on the dev role if the regular one is not started */
  55         if (wlcore_is_p2p_mgmt(wlvif))
  56                 cmd->role_id = wlvif->dev_role_id;
  57         else
  58                 cmd->role_id = wlvif->role_id;
  59
  60         if (WARN_ON(cmd->role_id == WL12XX_INVALID_ROLE_ID)) {
  61                 ret = -EINVAL;
  62                 goto out;
  63         }
  64
  65         cmd->scan_type = SCAN_TYPE_SEARCH;
  66         cmd->rssi_threshold = -127;
  67         cmd->snr_threshold = 0;
  68
  69         cmd->bss_type = SCAN_BSS_TYPE_ANY;
  70
  71         cmd->ssid_from_list = 0;
  72         cmd->filter = 0;
  73         cmd->add_broadcast = 0;
  74
  75         cmd->urgency = 0;
  76         cmd->protect = 0;
  77
  78         cmd->n_probe_reqs = wl->conf.scan.num_probe_reqs;
  79         cmd->terminate_after = 0;
  80
  81         /* configure channels */
  82         WARN_ON(req->n_ssids > 1);
  83
  84         cmd_channels = kzalloc(sizeof(*cmd_channels), GFP_KERNEL);
  85         if (!cmd_channels) {
  86                 ret = -ENOMEM;
  87                 goto out;
  88         }
  89
  90         wlcore_set_scan_chan_params(wl, cmd_channels, req->channels,
  91                                     req->n_channels, req->n_ssids,
  92                                     SCAN_TYPE_SEARCH);
  93         wl18xx_adjust_channels(cmd, cmd_channels);
  94
  95         /*
  96          * all the cycles params (except total cycles) should
  97          * remain 0 for normal scan
  98          */
  99         cmd->total_cycles = 1;
 100
 101         if (req->no_cck)
 102                 cmd->rate = WL18XX_SCAN_RATE_6;
 103
 104         cmd->tag = WL1271_SCAN_DEFAULT_TAG;
 105
 106         if (req->n_ssids) {
 107                 cmd->ssid_len = req->ssids[0].ssid_len;
 108                 memcpy(cmd->ssid, req->ssids[0].ssid, cmd->ssid_len);
 109         }
 110
 111         /* TODO: per-band ies? */
 112         if (cmd->active[0]) {
 113                 u8 band = IEEE80211_BAND_2GHZ;
 114                 ret = wl12xx_cmd_build_probe_req(wl, wlvif,
 115                                  cmd->role_id, band,
 116                                  req->ssids ? req->ssids[0].ssid : NULL,
 117                                  req->ssids ? req->ssids[0].ssid_len : 0,
 118                                  req->ie,
 119                                  req->ie_len,
 120                                  NULL,
 121                                  0,
 122                                  false);
 123                 if (ret < 0) {
 124                         wl1271_error("2.4GHz PROBE request template failed");
 125                         goto out;
 126                 }
 127         }
 128
 129         if (cmd->active[1] || cmd->dfs) {
 130                 u8 band = IEEE80211_BAND_5GHZ;
 131                 ret = wl12xx_cmd_build_probe_req(wl, wlvif,
 132                                  cmd->role_id, band,
 133                                  req->ssids ? req->ssids[0].ssid : NULL,
 134                                  req->ssids ? req->ssids[0].ssid_len : 0,
 135                                  req->ie,
 136                                  req->ie_len,
 137                                  NULL,
 138                                  0,
 139                                  false);
 140                 if (ret < 0) {
 141                         wl1271_error("5GHz PROBE request template failed");
 142                         goto out;
 143                 }
 144         }
 145
 146         wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));
 147
 148         ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
 149         if (ret < 0) {
 150                 wl1271_error("SCAN failed");
 151                 goto out;
 152         }
 153
 154 out:
 155         kfree(cmd_channels);
 156         kfree(cmd);
 157         return ret;
 158 }
 159
 160 void wl18xx_scan_completed(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 161 {
 162         wl->scan.failed = false;
 163         cancel_delayed_work(&wl->scan_complete_work);
 164         ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 165                                      msecs_to_jiffies(0));
 166 }
 167
 168 static
 169 int wl18xx_scan_sched_scan_config(struct wl1271 *wl,
 170                                   struct wl12xx_vif *wlvif,
 171                                   struct cfg80211_sched_scan_request *req,
 172                                   struct ieee80211_scan_ies *ies)
 173 {
 174         struct wl18xx_cmd_scan_params *cmd;
 175         struct wlcore_scan_channels *cmd_channels = NULL;
 176         struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 177         int ret;
 178         int filter_type;
 179
 180         wl1271_debug(DEBUG_CMD, "cmd sched_scan scan config");
 181
 182         filter_type = wlcore_scan_sched_scan_ssid_list(wl, wlvif, req);
 183         if (filter_type < 0)
 184                 return filter_type;
 185
 186         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 187         if (!cmd) {
 188                 ret = -ENOMEM;
 189                 goto out;
 190         }
 191
 192         cmd->role_id = wlvif->role_id;
 193
 194         if (WARN_ON(cmd->role_id == WL12XX_INVALID_ROLE_ID)) {
 195                 ret = -EINVAL;
 196                 goto out;
 197         }
 198
 199         cmd->scan_type = SCAN_TYPE_PERIODIC;
 200         cmd->rssi_threshold = c->rssi_threshold;
 201         cmd->snr_threshold = c->snr_threshold;
 202
 203         /* don't filter on BSS type */
 204         cmd->bss_type = SCAN_BSS_TYPE_ANY;
 205
 206         cmd->ssid_from_list = 1;
 207         if (filter_type == SCAN_SSID_FILTER_LIST)
 208                 cmd->filter = 1;
 209         cmd->add_broadcast = 0;
 210
 211         cmd->urgency = 0;
 212         cmd->protect = 0;
 213
 214         cmd->n_probe_reqs = c->num_probe_reqs;
 215         /* don't stop scanning automatically when something is found */
 216         cmd->terminate_after = 0;
 217
 218         cmd_channels = kzalloc(sizeof(*cmd_channels), GFP_KERNEL);
 219         if (!cmd_channels) {
 220                 ret = -ENOMEM;
 221                 goto out;
 222         }
 223
 224         /* configure channels */
 225         wlcore_set_scan_chan_params(wl, cmd_channels, req->channels,
 226                                     req->n_channels, req->n_ssids,
 227                                     SCAN_TYPE_PERIODIC);
 228         wl18xx_adjust_channels(cmd, cmd_channels);
 229
 230         if (c->num_short_intervals && c->long_interval &&
 231             c->long_interval > req->scan_plans[0].interval * MSEC_PER_SEC) {
 232                 cmd->short_cycles_msec =
 233                         cpu_to_le16(req->scan_plans[0].interval * MSEC_PER_SEC);
 234                 cmd->long_cycles_msec = cpu_to_le16(c->long_interval);
 235                 cmd->short_cycles_count = c->num_short_intervals;
 236         } else {
 237                 cmd->short_cycles_msec = 0;
 238                 cmd->long_cycles_msec =
 239                         cpu_to_le16(req->scan_plans[0].interval * MSEC_PER_SEC);
 240                 cmd->short_cycles_count = 0;
 241         }
 242         wl1271_debug(DEBUG_SCAN, "short_interval: %d, long_interval: %d, num_short: %d",
 243                      le16_to_cpu(cmd->short_cycles_msec),
 244                      le16_to_cpu(cmd->long_cycles_msec),
 245                      cmd->short_cycles_count);
 246
 247         cmd->total_cycles = 0;
 248
 249         cmd->tag = WL1271_SCAN_DEFAULT_TAG;
 250
 251         /* create a PERIODIC_SCAN_REPORT_EVENT whenever we've got a match */
 252         cmd->report_threshold = 1;
 253         cmd->terminate_on_report = 0;
 254
 255         if (cmd->active[0]) {
 256                 u8 band = IEEE80211_BAND_2GHZ;
 257                 ret = wl12xx_cmd_build_probe_req(wl, wlvif,
 258                                  cmd->role_id, band,
 259                                  req->ssids ? req->ssids[0].ssid : NULL,
 260                                  req->ssids ? req->ssids[0].ssid_len : 0,
 261                                  ies->ies[band],
 262                                  ies->len[band],
 263                                  ies->common_ies,
 264                                  ies->common_ie_len,
 265                                  true);
 266                 if (ret < 0) {
 267                         wl1271_error("2.4GHz PROBE request template failed");
 268                         goto out;
 269                 }
 270         }
 271
 272         if (cmd->active[1] || cmd->dfs) {
 273                 u8 band = IEEE80211_BAND_5GHZ;
 274                 ret = wl12xx_cmd_build_probe_req(wl, wlvif,
 275                                  cmd->role_id, band,
 276                                  req->ssids ? req->ssids[0].ssid : NULL,
 277                                  req->ssids ? req->ssids[0].ssid_len : 0,
 278                                  ies->ies[band],
 279                                  ies->len[band],
 280                                  ies->common_ies,
 281                                  ies->common_ie_len,
 282                                  true);
 283                 if (ret < 0) {
 284                         wl1271_error("5GHz PROBE request template failed");
 285                         goto out;
 286                 }
 287         }
 288
 289         wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));
 290
 291         ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
 292         if (ret < 0) {
 293                 wl1271_error("SCAN failed");
 294                 goto out;
 295         }
 296
 297 out:
 298         kfree(cmd_channels);
 299         kfree(cmd);
 300         return ret;
 301 }
 302
 303 int wl18xx_sched_scan_start(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 304                             struct cfg80211_sched_scan_request *req,
 305                             struct ieee80211_scan_ies *ies)
 306 {
 307         return wl18xx_scan_sched_scan_config(wl, wlvif, req, ies);
 308 }
 309
 310 static int __wl18xx_scan_stop(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 311                                u8 scan_type)
 312 {
 313         struct wl18xx_cmd_scan_stop *stop;
 314         int ret;
 315
 316         wl1271_debug(DEBUG_CMD, "cmd periodic scan stop");
 317
 318         stop = kzalloc(sizeof(*stop), GFP_KERNEL);
 319         if (!stop) {
 320                 wl1271_error("failed to alloc memory to send sched scan stop");
 321                 return -ENOMEM;
 322         }
 323
 324         stop->role_id = wlvif->role_id;
 325         stop->scan_type = scan_type;
 326
 327         ret = wl1271_cmd_send(wl, CMD_STOP_SCAN, stop, sizeof(*stop), 0);
 328         if (ret < 0) {
 329                 wl1271_error("failed to send sched scan stop command");
 330                 goto out_free;
 331         }
 332
 333 out_free:
 334         kfree(stop);
 335         return ret;
 336 }
 337
 338 void wl18xx_scan_sched_scan_stop(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 339 {
 340         __wl18xx_scan_stop(wl, wlvif, SCAN_TYPE_PERIODIC);
 341 }
 342 int wl18xx_scan_start(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 343                       struct cfg80211_scan_request *req)
 344 {
 345         return wl18xx_scan_send(wl, wlvif, req);
 346 }
 347
 348 int wl18xx_scan_stop(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 349 {
 350         return __wl18xx_scan_stop(wl, wlvif, SCAN_TYPE_SEARCH);
 351 }