drivers/net/wireless/wl12xx/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 "wl12xx.h"
  27 #include "cmd.h"
  28 #include "scan.h"
  29 #include "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         wl->scan.req = NULL;
  52         ieee80211_scan_completed(wl->hw, false);
  53
  54         /* restore hardware connection monitoring template */
  55         if (test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags))
  56                 wl1271_cmd_build_ap_probe_req(wl, wl->probereq);
  57
  58         if (wl->scan.failed) {
  59                 wl1271_info("Scan completed due to error.");
  60                 ieee80211_queue_work(wl->hw, &wl->recovery_work);
  61         }
  62         mutex_unlock(&wl->mutex);
  63
  64 }
  65
  66
  67 static int wl1271_get_scan_channels(struct wl1271 *wl,
  68                                     struct cfg80211_scan_request *req,
  69                                     struct basic_scan_channel_params *channels,
  70                                     enum ieee80211_band band, bool passive)
  71 {
  72         struct conf_scan_settings *c = &wl->conf.scan;
  73         int i, j;
  74         u32 flags;
  75
  76         for (i = 0, j = 0;
  77              i < req->n_channels && j < WL1271_SCAN_MAX_CHANNELS;
  78              i++) {
  79
  80                 flags = req->channels[i]->flags;
  81
  82                 if (!wl->scan.scanned_ch[i] &&
  83                     !(flags & IEEE80211_CHAN_DISABLED) &&
  84                     ((!!(flags & IEEE80211_CHAN_PASSIVE_SCAN)) == passive) &&
  85                     (req->channels[i]->band == band)) {
  86
  87                         wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
  88                                      req->channels[i]->band,
  89                                      req->channels[i]->center_freq);
  90                         wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
  91                                      req->channels[i]->hw_value,
  92                                      req->channels[i]->flags);
  93                         wl1271_debug(DEBUG_SCAN,
  94                                      "max_antenna_gain %d, max_power %d",
  95                                      req->channels[i]->max_antenna_gain,
  96                                      req->channels[i]->max_power);
  97                         wl1271_debug(DEBUG_SCAN, "beacon_found %d",
  98                                      req->channels[i]->beacon_found);
  99
 100                         if (!passive) {
 101                                 channels[j].min_duration =
 102                                         cpu_to_le32(c->min_dwell_time_active);
 103                                 channels[j].max_duration =
 104                                         cpu_to_le32(c->max_dwell_time_active);
 105                         } else {
 106                                 channels[j].min_duration =
 107                                         cpu_to_le32(c->min_dwell_time_passive);
 108                                 channels[j].max_duration =
 109                                         cpu_to_le32(c->max_dwell_time_passive);
 110                         }
 111                         channels[j].early_termination = 0;
 112                         channels[j].tx_power_att = req->channels[i]->max_power;
 113                         channels[j].channel = req->channels[i]->hw_value;
 114
 115                         memset(&channels[j].bssid_lsb, 0xff, 4);
 116                         memset(&channels[j].bssid_msb, 0xff, 2);
 117
 118                         /* Mark the channels we already used */
 119                         wl->scan.scanned_ch[i] = true;
 120
 121                         j++;
 122                 }
 123         }
 124
 125         return j;
 126 }
 127
 128 #define WL1271_NOTHING_TO_SCAN 1
 129
 130 static int wl1271_scan_send(struct wl1271 *wl, enum ieee80211_band band,
 131                              bool passive, u32 basic_rate)
 132 {
 133         struct wl1271_cmd_scan *cmd;
 134         struct wl1271_cmd_trigger_scan_to *trigger;
 135         int ret;
 136         u16 scan_options = 0;
 137
 138         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 139         trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
 140         if (!cmd || !trigger) {
 141                 ret = -ENOMEM;
 142                 goto out;
 143         }
 144
 145         /* We always use high priority scans */
 146         scan_options = WL1271_SCAN_OPT_PRIORITY_HIGH;
 147
 148         /* No SSIDs means that we have a forced passive scan */
 149         if (passive || wl->scan.req->n_ssids == 0)
 150                 scan_options |= WL1271_SCAN_OPT_PASSIVE;
 151
 152         cmd->params.scan_options = cpu_to_le16(scan_options);
 153
 154         cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req,
 155                                                     cmd->channels,
 156                                                     band, passive);
 157         if (cmd->params.n_ch == 0) {
 158                 ret = WL1271_NOTHING_TO_SCAN;
 159                 goto out;
 160         }
 161
 162         cmd->params.tx_rate = cpu_to_le32(basic_rate);
 163         cmd->params.rx_config_options = cpu_to_le32(CFG_RX_ALL_GOOD);
 164         cmd->params.rx_filter_options =
 165                 cpu_to_le32(CFG_RX_PRSP_EN | CFG_RX_MGMT_EN | CFG_RX_BCN_EN);
 166
 167         cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs;
 168         cmd->params.tx_rate = cpu_to_le32(basic_rate);
 169         cmd->params.tid_trigger = 0;
 170         cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;
 171
 172         if (band == IEEE80211_BAND_2GHZ)
 173                 cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ;
 174         else
 175                 cmd->params.band = WL1271_SCAN_BAND_5_GHZ;
 176
 177         if (wl->scan.ssid_len && wl->scan.ssid) {
 178                 cmd->params.ssid_len = wl->scan.ssid_len;
 179                 memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len);
 180         }
 181
 182         ret = wl1271_cmd_build_probe_req(wl, wl->scan.ssid, wl->scan.ssid_len,
 183                                          wl->scan.req->ie, wl->scan.req->ie_len,
 184                                          band);
 185         if (ret < 0) {
 186                 wl1271_error("PROBE request template failed");
 187                 goto out;
 188         }
 189
 190         /* disable the timeout */
 191         trigger->timeout = 0;
 192         ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
 193                               sizeof(*trigger), 0);
 194         if (ret < 0) {
 195                 wl1271_error("trigger scan to failed for hw scan");
 196                 goto out;
 197         }
 198
 199         wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));
 200
 201         ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
 202         if (ret < 0) {
 203                 wl1271_error("SCAN failed");
 204                 goto out;
 205         }
 206
 207 out:
 208         kfree(cmd);
 209         kfree(trigger);
 210         return ret;
 211 }
 212
 213 void wl1271_scan_stm(struct wl1271 *wl)
 214 {
 215         int ret = 0;
 216
 217         switch (wl->scan.state) {
 218         case WL1271_SCAN_STATE_IDLE:
 219                 break;
 220
 221         case WL1271_SCAN_STATE_2GHZ_ACTIVE:
 222                 ret = wl1271_scan_send(wl, IEEE80211_BAND_2GHZ, false,
 223                                        wl->conf.tx.basic_rate);
 224                 if (ret == WL1271_NOTHING_TO_SCAN) {
 225                         wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE;
 226                         wl1271_scan_stm(wl);
 227                 }
 228
 229                 break;
 230
 231         case WL1271_SCAN_STATE_2GHZ_PASSIVE:
 232                 ret = wl1271_scan_send(wl, IEEE80211_BAND_2GHZ, true,
 233                                        wl->conf.tx.basic_rate);
 234                 if (ret == WL1271_NOTHING_TO_SCAN) {
 235                         if (wl->enable_11a)
 236                                 wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE;
 237                         else
 238                                 wl->scan.state = WL1271_SCAN_STATE_DONE;
 239                         wl1271_scan_stm(wl);
 240                 }
 241
 242                 break;
 243
 244         case WL1271_SCAN_STATE_5GHZ_ACTIVE:
 245                 ret = wl1271_scan_send(wl, IEEE80211_BAND_5GHZ, false,
 246                                        wl->conf.tx.basic_rate_5);
 247                 if (ret == WL1271_NOTHING_TO_SCAN) {
 248                         wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE;
 249                         wl1271_scan_stm(wl);
 250                 }
 251
 252                 break;
 253
 254         case WL1271_SCAN_STATE_5GHZ_PASSIVE:
 255                 ret = wl1271_scan_send(wl, IEEE80211_BAND_5GHZ, true,
 256                                        wl->conf.tx.basic_rate_5);
 257                 if (ret == WL1271_NOTHING_TO_SCAN) {
 258                         wl->scan.state = WL1271_SCAN_STATE_DONE;
 259                         wl1271_scan_stm(wl);
 260                 }
 261
 262                 break;
 263
 264         case WL1271_SCAN_STATE_DONE:
 265                 wl->scan.failed = false;
 266                 cancel_delayed_work(&wl->scan_complete_work);
 267                 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 268                                              msecs_to_jiffies(0));
 269                 break;
 270
 271         default:
 272                 wl1271_error("invalid scan state");
 273                 break;
 274         }
 275
 276         if (ret < 0) {
 277                 cancel_delayed_work(&wl->scan_complete_work);
 278                 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 279                                              msecs_to_jiffies(0));
 280         }
 281 }
 282
 283 int wl1271_scan(struct wl1271 *wl, const u8 *ssid, size_t ssid_len,
 284                 struct cfg80211_scan_request *req)
 285 {
 286         if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
 287                 return -EBUSY;
 288
 289         wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
 290
 291         if (ssid_len && ssid) {
 292                 wl->scan.ssid_len = ssid_len;
 293                 memcpy(wl->scan.ssid, ssid, ssid_len);
 294         } else {
 295                 wl->scan.ssid_len = 0;
 296         }
 297
 298         wl->scan.req = req;
 299
 300         wl->scan.scanned_ch = kcalloc(req->n_channels,
 301                                       sizeof(*wl->scan.scanned_ch),
 302                                       GFP_KERNEL);
 303         /* we assume failure so that timeout scenarios are handled correctly */
 304         wl->scan.failed = true;
 305         ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 306                                      msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
 307
 308         wl1271_scan_stm(wl);
 309
 310         return 0;
 311 }