drivers/net/wireless/rt2x00/rt2x00config.c

   1 /*
   2         Copyright (C) 2004 - 2009 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU 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
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00lib
  23         Abstract: rt2x00 generic configuration routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28
  29 #include "rt2x00.h"
  30 #include "rt2x00lib.h"
  31
  32 void rt2x00lib_config_intf(struct rt2x00_dev *rt2x00dev,
  33                            struct rt2x00_intf *intf,
  34                            enum nl80211_iftype type,
  35                            const u8 *mac, const u8 *bssid)
  36 {
  37         struct rt2x00intf_conf conf;
  38         unsigned int flags = 0;
  39
  40         conf.type = type;
  41
  42         switch (type) {
  43         case NL80211_IFTYPE_ADHOC:
  44         case NL80211_IFTYPE_AP:
  45         case NL80211_IFTYPE_MESH_POINT:
  46         case NL80211_IFTYPE_WDS:
  47                 conf.sync = TSF_SYNC_BEACON;
  48                 break;
  49         case NL80211_IFTYPE_STATION:
  50                 conf.sync = TSF_SYNC_INFRA;
  51                 break;
  52         default:
  53                 conf.sync = TSF_SYNC_NONE;
  54                 break;
  55         }
  56
  57         /*
  58          * Note that when NULL is passed as address we will send
  59          * 00:00:00:00:00 to the device to clear the address.
  60          * This will prevent the device being confused when it wants
  61          * to ACK frames or consideres itself associated.
  62          */
  63         memset(&conf.mac, 0, sizeof(conf.mac));
  64         if (mac)
  65                 memcpy(&conf.mac, mac, ETH_ALEN);
  66
  67         memset(&conf.bssid, 0, sizeof(conf.bssid));
  68         if (bssid)
  69                 memcpy(&conf.bssid, bssid, ETH_ALEN);
  70
  71         flags |= CONFIG_UPDATE_TYPE;
  72         if (mac || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
  73                 flags |= CONFIG_UPDATE_MAC;
  74         if (bssid || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
  75                 flags |= CONFIG_UPDATE_BSSID;
  76
  77         rt2x00dev->ops->lib->config_intf(rt2x00dev, intf, &conf, flags);
  78 }
  79
  80 void rt2x00lib_config_erp(struct rt2x00_dev *rt2x00dev,
  81                           struct rt2x00_intf *intf,
  82                           struct ieee80211_bss_conf *bss_conf)
  83 {
  84         struct rt2x00lib_erp erp;
  85
  86         memset(&erp, 0, sizeof(erp));
  87
  88         erp.short_preamble = bss_conf->use_short_preamble;
  89         erp.cts_protection = bss_conf->use_cts_prot;
  90
  91         erp.slot_time = bss_conf->use_short_slot ? SHORT_SLOT_TIME : SLOT_TIME;
  92         erp.sifs = SIFS;
  93         erp.pifs = bss_conf->use_short_slot ? SHORT_PIFS : PIFS;
  94         erp.difs = bss_conf->use_short_slot ? SHORT_DIFS : DIFS;
  95         erp.eifs = bss_conf->use_short_slot ? SHORT_EIFS : EIFS;
  96
  97         erp.basic_rates = bss_conf->basic_rates;
  98         erp.beacon_int = bss_conf->beacon_int;
  99
 100         /* Update global beacon interval time, this is needed for PS support */
 101         rt2x00dev->beacon_int = bss_conf->beacon_int;
 102
 103         rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp);
 104 }
 105
 106 static inline
 107 enum antenna rt2x00lib_config_antenna_check(enum antenna current_ant,
 108                                             enum antenna default_ant)
 109 {
 110         if (current_ant != ANTENNA_SW_DIVERSITY)
 111                 return current_ant;
 112         return (default_ant != ANTENNA_SW_DIVERSITY) ? default_ant : ANTENNA_B;
 113 }
 114
 115 void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
 116                               struct antenna_setup config)
 117 {
 118         struct link_ant *ant = &rt2x00dev->link.ant;
 119         struct antenna_setup *def = &rt2x00dev->default_ant;
 120         struct antenna_setup *active = &rt2x00dev->link.ant.active;
 121
 122         /*
 123          * Failsafe: Make sure we are not sending the
 124          * ANTENNA_SW_DIVERSITY state to the driver.
 125          * If that happens, fallback to hardware defaults,
 126          * or our own default.
 127          * If diversity handling is active for a particular antenna,
 128          * we shouldn't overwrite that antenna.
 129          * The calls to rt2x00lib_config_antenna_check()
 130          * might have caused that we restore back to the already
 131          * active setting. If that has happened we can quit.
 132          */
 133         if (!(ant->flags & ANTENNA_RX_DIVERSITY))
 134                 config.rx = rt2x00lib_config_antenna_check(config.rx, def->rx);
 135         else
 136                 config.rx = active->rx;
 137
 138         if (!(ant->flags & ANTENNA_TX_DIVERSITY))
 139                 config.tx = rt2x00lib_config_antenna_check(config.tx, def->tx);
 140         else
 141                 config.tx = active->tx;
 142
 143         if (config.rx == active->rx && config.tx == active->tx)
 144                 return;
 145
 146         /*
 147          * Antenna setup changes require the RX to be disabled,
 148          * else the changes will be ignored by the device.
 149          */
 150         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 151                 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF_LINK);
 152
 153         /*
 154          * Write new antenna setup to device and reset the link tuner.
 155          * The latter is required since we need to recalibrate the
 156          * noise-sensitivity ratio for the new setup.
 157          */
 158         rt2x00dev->ops->lib->config_ant(rt2x00dev, &config);
 159
 160         rt2x00link_reset_tuner(rt2x00dev, true);
 161
 162         memcpy(active, &config, sizeof(config));
 163
 164         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 165                 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON_LINK);
 166 }
 167
 168 void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
 169                       struct ieee80211_conf *conf,
 170                       unsigned int ieee80211_flags)
 171 {
 172         struct rt2x00lib_conf libconf;
 173
 174         memset(&libconf, 0, sizeof(libconf));
 175
 176         libconf.conf = conf;
 177
 178         if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL) {
 179                 if (conf_is_ht40(conf))
 180                         __set_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
 181                 else
 182                         __clear_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
 183
 184                 memcpy(&libconf.rf,
 185                        &rt2x00dev->spec.channels[conf->channel->hw_value],
 186                        sizeof(libconf.rf));
 187
 188                 memcpy(&libconf.channel,
 189                        &rt2x00dev->spec.channels_info[conf->channel->hw_value],
 190                        sizeof(libconf.channel));
 191         }
 192
 193         /*
 194          * Start configuration.
 195          */
 196         rt2x00dev->ops->lib->config(rt2x00dev, &libconf, ieee80211_flags);
 197
 198         /*
 199          * Some configuration changes affect the link quality
 200          * which means we need to reset the link tuner.
 201          */
 202         if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL)
 203                 rt2x00link_reset_tuner(rt2x00dev, false);
 204
 205         rt2x00dev->curr_band = conf->channel->band;
 206         rt2x00dev->tx_power = conf->power_level;
 207         rt2x00dev->short_retry = conf->short_frame_max_tx_count;
 208         rt2x00dev->long_retry = conf->long_frame_max_tx_count;
 209
 210         rt2x00dev->rx_status.band = conf->channel->band;
 211         rt2x00dev->rx_status.freq = conf->channel->center_freq;
 212 }