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