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 static int wl1271_get_scan_channels(struct wl1271 *wl,
  32                                     struct cfg80211_scan_request *req,
  33                                     struct basic_scan_channel_params *channels,
  34                                     enum ieee80211_band band, bool passive)
  35 {
  36         int i, j;
  37         u32 flags;
  38
  39         for (i = 0, j = 0;
  40              i < req->n_channels && j < WL1271_SCAN_MAX_CHANNELS;
  41              i++) {
  42
  43                 flags = req->channels[i]->flags;
  44
  45                 if (!wl->scan.scanned_ch[i] &&
  46                     !(flags & IEEE80211_CHAN_DISABLED) &&
  47                     ((!!(flags & IEEE80211_CHAN_PASSIVE_SCAN)) == passive) &&
  48                     (req->channels[i]->band == band)) {
  49
  50                         wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
  51                                      req->channels[i]->band,
  52                                      req->channels[i]->center_freq);
  53                         wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
  54                                      req->channels[i]->hw_value,
  55                                      req->channels[i]->flags);
  56                         wl1271_debug(DEBUG_SCAN,
  57                                      "max_antenna_gain %d, max_power %d",
  58                                      req->channels[i]->max_antenna_gain,
  59                                      req->channels[i]->max_power);
  60                         wl1271_debug(DEBUG_SCAN, "beacon_found %d",
  61                                      req->channels[i]->beacon_found);
  62
  63                         channels[j].min_duration =
  64                                 cpu_to_le32(WL1271_SCAN_CHAN_MIN_DURATION);
  65                         channels[j].max_duration =
  66                                 cpu_to_le32(WL1271_SCAN_CHAN_MAX_DURATION);
  67                         channels[j].early_termination = 0;
  68                         channels[j].tx_power_att = req->channels[i]->max_power;
  69                         channels[j].channel = req->channels[i]->hw_value;
  70
  71                         memset(&channels[j].bssid_lsb, 0xff, 4);
  72                         memset(&channels[j].bssid_msb, 0xff, 2);
  73
  74                         /* Mark the channels we already used */
  75                         wl->scan.scanned_ch[i] = true;
  76
  77                         j++;
  78                 }
  79         }
  80
  81         return j;
  82 }
  83
  84 #define WL1271_NOTHING_TO_SCAN 1
  85
  86 static int wl1271_scan_send(struct wl1271 *wl, enum ieee80211_band band,
  87                              bool passive, u32 basic_rate)
  88 {
  89         struct wl1271_cmd_scan *cmd;
  90         struct wl1271_cmd_trigger_scan_to *trigger;
  91         int ret;
  92         u16 scan_options = 0;
  93
  94         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
  95         trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
  96         if (!cmd || !trigger) {
  97                 ret = -ENOMEM;
  98                 goto out;
  99         }
 100
 101         /* We always use high priority scans */
 102         scan_options = WL1271_SCAN_OPT_PRIORITY_HIGH;
 103         if(passive)
 104                 scan_options |= WL1271_SCAN_OPT_PASSIVE;
 105         cmd->params.scan_options = cpu_to_le16(scan_options);
 106
 107         cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req,
 108                                                     cmd->channels,
 109                                                     band, passive);
 110         if (cmd->params.n_ch == 0) {
 111                 ret = WL1271_NOTHING_TO_SCAN;
 112                 goto out;
 113         }
 114
 115         cmd->params.tx_rate = cpu_to_le32(basic_rate);
 116         cmd->params.rx_config_options = cpu_to_le32(CFG_RX_ALL_GOOD);
 117         cmd->params.rx_filter_options =
 118                 cpu_to_le32(CFG_RX_PRSP_EN | CFG_RX_MGMT_EN | CFG_RX_BCN_EN);
 119
 120         cmd->params.n_probe_reqs = WL1271_SCAN_PROBE_REQS;
 121         cmd->params.tx_rate = cpu_to_le32(basic_rate);
 122         cmd->params.tid_trigger = 0;
 123         cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;
 124
 125         if (band == IEEE80211_BAND_2GHZ)
 126                 cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ;
 127         else
 128                 cmd->params.band = WL1271_SCAN_BAND_5_GHZ;
 129
 130         if (wl->scan.ssid_len && wl->scan.ssid) {
 131                 cmd->params.ssid_len = wl->scan.ssid_len;
 132                 memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len);
 133         }
 134
 135         ret = wl1271_cmd_build_probe_req(wl, wl->scan.ssid, wl->scan.ssid_len,
 136                                          wl->scan.req->ie, wl->scan.req->ie_len,
 137                                          band);
 138         if (ret < 0) {
 139                 wl1271_error("PROBE request template failed");
 140                 goto out;
 141         }
 142
 143         /* disable the timeout */
 144         trigger->timeout = 0;
 145         ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
 146                               sizeof(*trigger), 0);
 147         if (ret < 0) {
 148                 wl1271_error("trigger scan to failed for hw scan");
 149                 goto out;
 150         }
 151
 152         wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));
 153
 154         ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
 155         if (ret < 0) {
 156                 wl1271_error("SCAN failed");
 157                 goto out;
 158         }
 159
 160 out:
 161         kfree(cmd);
 162         kfree(trigger);
 163         return ret;
 164 }
 165
 166 void wl1271_scan_stm(struct wl1271 *wl)
 167 {
 168         int ret;
 169
 170         switch (wl->scan.state) {
 171         case WL1271_SCAN_STATE_IDLE:
 172                 break;
 173
 174         case WL1271_SCAN_STATE_2GHZ_ACTIVE:
 175                 ret = wl1271_scan_send(wl, IEEE80211_BAND_2GHZ, false,
 176                                        wl->conf.tx.basic_rate);
 177                 if (ret == WL1271_NOTHING_TO_SCAN) {
 178                         wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE;
 179                         wl1271_scan_stm(wl);
 180                 }
 181
 182                 break;
 183
 184         case WL1271_SCAN_STATE_2GHZ_PASSIVE:
 185                 ret = wl1271_scan_send(wl, IEEE80211_BAND_2GHZ, true,
 186                                        wl->conf.tx.basic_rate);
 187                 if (ret == WL1271_NOTHING_TO_SCAN) {
 188                         if (wl1271_11a_enabled())
 189                                 wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE;
 190                         else
 191                                 wl->scan.state = WL1271_SCAN_STATE_DONE;
 192                         wl1271_scan_stm(wl);
 193                 }
 194
 195                 break;
 196
 197         case WL1271_SCAN_STATE_5GHZ_ACTIVE:
 198                 ret = wl1271_scan_send(wl, IEEE80211_BAND_5GHZ, false,
 199                                        wl->conf.tx.basic_rate_5);
 200                 if (ret == WL1271_NOTHING_TO_SCAN) {
 201                         wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE;
 202                         wl1271_scan_stm(wl);
 203                 }
 204
 205                 break;
 206
 207         case WL1271_SCAN_STATE_5GHZ_PASSIVE:
 208                 ret = wl1271_scan_send(wl, IEEE80211_BAND_5GHZ, true,
 209                                        wl->conf.tx.basic_rate_5);
 210                 if (ret == WL1271_NOTHING_TO_SCAN) {
 211                         wl->scan.state = WL1271_SCAN_STATE_DONE;
 212                         wl1271_scan_stm(wl);
 213                 }
 214
 215                 break;
 216
 217         case WL1271_SCAN_STATE_DONE:
 218                 ieee80211_scan_completed(wl->hw, false);
 219
 220                 kfree(wl->scan.scanned_ch);
 221                 wl->scan.scanned_ch = NULL;
 222
 223                 wl->scan.state = WL1271_SCAN_STATE_IDLE;
 224                 break;
 225
 226         default:
 227                 wl1271_error("invalid scan state");
 228                 break;
 229         }
 230 }
 231
 232 int wl1271_scan(struct wl1271 *wl, const u8 *ssid, size_t ssid_len,
 233                 struct cfg80211_scan_request *req)
 234 {
 235         if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
 236                 return -EBUSY;
 237
 238         wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
 239
 240         if (ssid_len && ssid) {
 241                 wl->scan.ssid_len = ssid_len;
 242                 memcpy(wl->scan.ssid, ssid, ssid_len);
 243         } else {
 244                 wl->scan.ssid_len = 0;
 245         }
 246
 247         wl->scan.req = req;
 248
 249         wl->scan.scanned_ch = kcalloc(req->n_channels,
 250                                       sizeof(*wl->scan.scanned_ch),
 251                                       GFP_KERNEL);
 252         wl1271_scan_stm(wl);
 253
 254         return 0;
 255 }