drivers/net/wireless/wl12xx/wl1271_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 "wl1271.h"
  27 #include "wl1271_cmd.h"
  28 #include "wl1271_scan.h"
  29 #include "wl1271_acx.h"
  30
  31 void wl1271_scan_complete_work(struct work_struct *work)
  32 {
  33         struct delayed_work *dwork;
  34         struct wl1271 *wl;
  35
  36         dwork = container_of(work, struct delayed_work, work);
  37         wl = container_of(dwork, struct wl1271, scan_complete_work);
  38
  39         wl1271_debug(DEBUG_SCAN, "Scanning complete");
  40
  41         mutex_lock(&wl->mutex);
  42
  43         if (wl->scan.state == WL1271_SCAN_STATE_IDLE) {
  44                 mutex_unlock(&wl->mutex);
  45                 return;
  46         }
  47
  48         wl->scan.state = WL1271_SCAN_STATE_IDLE;
  49         kfree(wl->scan.scanned_ch);
  50         wl->scan.scanned_ch = NULL;
  51         mutex_unlock(&wl->mutex);
  52
  53         ieee80211_scan_completed(wl->hw, false);
  54
  55         if (wl->scan.failed) {
  56                 wl1271_info("Scan completed due to error.");
  57                 ieee80211_queue_work(wl->hw, &wl->recovery_work);
  58         }
  59 }
  60
  61
  62 static int wl1271_get_scan_channels(struct wl1271 *wl,
  63                                     struct cfg80211_scan_request *req,
  64                                     struct basic_scan_channel_params *channels,
  65                                     enum ieee80211_band band, bool passive)
  66 {
  67         struct conf_scan_settings *c = &wl->conf.scan;
  68         int i, j;
  69         u32 flags;
  70
  71         for (i = 0, j = 0;
  72              i < req->n_channels && j < WL1271_SCAN_MAX_CHANNELS;
  73              i++) {
  74
  75                 flags = req->channels[i]->flags;
  76
  77                 if (!wl->scan.scanned_ch[i] &&
  78                     !(flags & IEEE80211_CHAN_DISABLED) &&
  79                     ((!!(flags & IEEE80211_CHAN_PASSIVE_SCAN)) == passive) &&
  80                     (req->channels[i]->band == band)) {
  81
  82                         wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
  83                                      req->channels[i]->band,
  84                                      req->channels[i]->center_freq);
  85                         wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
  86                                      req->channels[i]->hw_value,
  87                                      req->channels[i]->flags);
  88                         wl1271_debug(DEBUG_SCAN,
  89                                      "max_antenna_gain %d, max_power %d",
  90                                      req->channels[i]->max_antenna_gain,
  91                                      req->channels[i]->max_power);
  92                         wl1271_debug(DEBUG_SCAN, "beacon_found %d",
  93                                      req->channels[i]->beacon_found);
  94
  95                         if (!passive) {
  96                                 channels[j].min_duration =
  97                                         cpu_to_le32(c->min_dwell_time_active);
  98                                 channels[j].max_duration =
  99                                         cpu_to_le32(c->max_dwell_time_active);
 100                         } else {
 101                                 channels[j].min_duration =
 102                                         cpu_to_le32(c->min_dwell_time_passive);
 103                                 channels[j].max_duration =
 104                                         cpu_to_le32(c->max_dwell_time_passive);
 105                         }
 106                         channels[j].early_termination = 0;
 107                         channels[j].tx_power_att = req->channels[i]->max_power;
 108                         channels[j].channel = req->channels[i]->hw_value;
 109
 110                         memset(&channels[j].bssid_lsb, 0xff, 4);
 111                         memset(&channels[j].bssid_msb, 0xff, 2);
 112
 113                         /* Mark the channels we already used */
 114                         wl->scan.scanned_ch[i] = true;
 115
 116                         j++;
 117                 }
 118         }
 119
 120         return j;
 121 }
 122
 123 #define WL1271_NOTHING_TO_SCAN 1
 124
 125 static int wl1271_scan_send(struct wl1271 *wl, enum ieee80211_band band,
 126                              bool passive, u32 basic_rate)
 127 {
 128         struct wl1271_cmd_scan *cmd;
 129         struct wl1271_cmd_trigger_scan_to *trigger;
 130         int ret;
 131         u16 scan_options = 0;
 132
 133         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 134         trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
 135         if (!cmd || !trigger) {
 136                 ret = -ENOMEM;
 137                 goto out;
 138         }
 139
 140         /* We always use high priority scans */
 141         scan_options = WL1271_SCAN_OPT_PRIORITY_HIGH;
 142
 143         /* No SSIDs means that we have a forced passive scan */
 144         if (passive || wl->scan.req->n_ssids == 0)
 145                 scan_options |= WL1271_SCAN_OPT_PASSIVE;
 146
 147         cmd->params.scan_options = cpu_to_le16(scan_options);
 148
 149         cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req,
 150                                                     cmd->channels,
 151                                                     band, passive);
 152         if (cmd->params.n_ch == 0) {
 153                 ret = WL1271_NOTHING_TO_SCAN;
 154                 goto out;
 155         }
 156
 157         cmd->params.tx_rate = cpu_to_le32(basic_rate);
 158         cmd->params.rx_config_options = cpu_to_le32(CFG_RX_ALL_GOOD);
 159         cmd->params.rx_filter_options =
 160                 cpu_to_le32(CFG_RX_PRSP_EN | CFG_RX_MGMT_EN | CFG_RX_BCN_EN);
 161
 162         cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs;
 163         cmd->params.tx_rate = cpu_to_le32(basic_rate);
 164         cmd->params.tid_trigger = 0;
 165         cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;
 166
 167         if (band == IEEE80211_BAND_2GHZ)
 168                 cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ;
 169         else
 170                 cmd->params.band = WL1271_SCAN_BAND_5_GHZ;
 171
 172         if (wl->scan.ssid_len && wl->scan.ssid) {
 173                 cmd->params.ssid_len = wl->scan.ssid_len;
 174                 memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len);
 175         }
 176
 177         ret = wl1271_cmd_build_probe_req(wl, wl->scan.ssid, wl->scan.ssid_len,
 178                                          wl->scan.req->ie, wl->scan.req->ie_len,
 179                                          band);
 180         if (ret < 0) {
 181                 wl1271_error("PROBE request template failed");
 182                 goto out;
 183         }
 184
 185         /* disable the timeout */
 186         trigger->timeout = 0;
 187         ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
 188                               sizeof(*trigger), 0);
 189         if (ret < 0) {
 190                 wl1271_error("trigger scan to failed for hw scan");
 191                 goto out;
 192         }
 193
 194         wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));
 195
 196         ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
 197         if (ret < 0) {
 198                 wl1271_error("SCAN failed");
 199                 goto out;
 200         }
 201
 202 out:
 203         kfree(cmd);
 204         kfree(trigger);
 205         return ret;
 206 }
 207
 208 void wl1271_scan_stm(struct wl1271 *wl)
 209 {
 210         int ret = 0;
 211
 212         switch (wl->scan.state) {
 213         case WL1271_SCAN_STATE_IDLE:
 214                 break;
 215
 216         case WL1271_SCAN_STATE_2GHZ_ACTIVE:
 217                 ret = wl1271_scan_send(wl, IEEE80211_BAND_2GHZ, false,
 218                                        wl->conf.tx.basic_rate);
 219                 if (ret == WL1271_NOTHING_TO_SCAN) {
 220                         wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE;
 221                         wl1271_scan_stm(wl);
 222                 }
 223
 224                 break;
 225
 226         case WL1271_SCAN_STATE_2GHZ_PASSIVE:
 227                 ret = wl1271_scan_send(wl, IEEE80211_BAND_2GHZ, true,
 228                                        wl->conf.tx.basic_rate);
 229                 if (ret == WL1271_NOTHING_TO_SCAN) {
 230                         if (wl->enable_11a)
 231                                 wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE;
 232                         else
 233                                 wl->scan.state = WL1271_SCAN_STATE_DONE;
 234                         wl1271_scan_stm(wl);
 235                 }
 236
 237                 break;
 238
 239         case WL1271_SCAN_STATE_5GHZ_ACTIVE:
 240                 ret = wl1271_scan_send(wl, IEEE80211_BAND_5GHZ, false,
 241                                        wl->conf.tx.basic_rate_5);
 242                 if (ret == WL1271_NOTHING_TO_SCAN) {
 243                         wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE;
 244                         wl1271_scan_stm(wl);
 245                 }
 246
 247                 break;
 248
 249         case WL1271_SCAN_STATE_5GHZ_PASSIVE:
 250                 ret = wl1271_scan_send(wl, IEEE80211_BAND_5GHZ, true,
 251                                        wl->conf.tx.basic_rate_5);
 252                 if (ret == WL1271_NOTHING_TO_SCAN) {
 253                         wl->scan.state = WL1271_SCAN_STATE_DONE;
 254                         wl1271_scan_stm(wl);
 255                 }
 256
 257                 break;
 258
 259         case WL1271_SCAN_STATE_DONE:
 260                 wl->scan.failed = false;
 261                 cancel_delayed_work(&wl->scan_complete_work);
 262                 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 263                                              msecs_to_jiffies(0));
 264                 break;
 265
 266         default:
 267                 wl1271_error("invalid scan state");
 268                 break;
 269         }
 270
 271         if (ret < 0) {
 272                 cancel_delayed_work(&wl->scan_complete_work);
 273                 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 274                                              msecs_to_jiffies(0));
 275         }
 276 }
 277
 278 int wl1271_scan(struct wl1271 *wl, const u8 *ssid, size_t ssid_len,
 279                 struct cfg80211_scan_request *req)
 280 {
 281         if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
 282                 return -EBUSY;
 283
 284         wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
 285
 286         if (ssid_len && ssid) {
 287                 wl->scan.ssid_len = ssid_len;
 288                 memcpy(wl->scan.ssid, ssid, ssid_len);
 289         } else {
 290                 wl->scan.ssid_len = 0;
 291         }
 292
 293         wl->scan.req = req;
 294
 295         wl->scan.scanned_ch = kcalloc(req->n_channels,
 296                                       sizeof(*wl->scan.scanned_ch),
 297                                       GFP_KERNEL);
 298         /* we assume failure so that timeout scenarios are handled correctly */
 299         wl->scan.failed = true;
 300         ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 301                                      msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
 302
 303         wl1271_scan_stm(wl);
 304
 305         return 0;
 306 }