drivers/net/wireless/rt2x00/rt2x00config.c

   1 /*
   2         Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
   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, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 /*
  20         Module: rt2x00lib
  21         Abstract: rt2x00 generic configuration routines.
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26
  27 #include "rt2x00.h"
  28 #include "rt2x00lib.h"
  29
  30 void rt2x00lib_config_intf(struct rt2x00_dev *rt2x00dev,
  31                            struct rt2x00_intf *intf,
  32                            enum nl80211_iftype type,
  33                            const u8 *mac, const u8 *bssid)
  34 {
  35         struct rt2x00intf_conf conf;
  36         unsigned int flags = 0;
  37
  38         conf.type = type;
  39
  40         switch (type) {
  41         case NL80211_IFTYPE_ADHOC:
  42                 conf.sync = TSF_SYNC_ADHOC;
  43                 break;
  44         case NL80211_IFTYPE_AP:
  45         case NL80211_IFTYPE_MESH_POINT:
  46         case NL80211_IFTYPE_WDS:
  47                 conf.sync = TSF_SYNC_AP_NONE;
  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 considers 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                           u32 changed)
  84 {
  85         struct rt2x00lib_erp erp;
  86
  87         memset(&erp, 0, sizeof(erp));
  88
  89         erp.short_preamble = bss_conf->use_short_preamble;
  90         erp.cts_protection = bss_conf->use_cts_prot;
  91
  92         erp.slot_time = bss_conf->use_short_slot ? SHORT_SLOT_TIME : SLOT_TIME;
  93         erp.sifs = SIFS;
  94         erp.pifs = bss_conf->use_short_slot ? SHORT_PIFS : PIFS;
  95         erp.difs = bss_conf->use_short_slot ? SHORT_DIFS : DIFS;
  96         erp.eifs = bss_conf->use_short_slot ? SHORT_EIFS : EIFS;
  97
  98         erp.basic_rates = bss_conf->basic_rates;
  99         erp.beacon_int = bss_conf->beacon_int;
 100
 101         /* Update the AID, this is needed for dynamic PS support */
 102         rt2x00dev->aid = bss_conf->assoc ? bss_conf->aid : 0;
 103         rt2x00dev->last_beacon = bss_conf->sync_tsf;
 104
 105         /* Update global beacon interval time, this is needed for PS support */
 106         rt2x00dev->beacon_int = bss_conf->beacon_int;
 107
 108         if (changed & BSS_CHANGED_HT)
 109                 erp.ht_opmode = bss_conf->ht_operation_mode;
 110
 111         rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp, changed);
 112 }
 113
 114 void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
 115                               struct antenna_setup config)
 116 {
 117         struct link_ant *ant = &rt2x00dev->link.ant;
 118         struct antenna_setup *def = &rt2x00dev->default_ant;
 119         struct antenna_setup *active = &rt2x00dev->link.ant.active;
 120
 121         /*
 122          * When the caller tries to send the SW diversity,
 123          * we must update the ANTENNA_RX_DIVERSITY flag to
 124          * enable the antenna diversity in the link tuner.
 125          *
 126          * Secondly, we must guarentee we never send the
 127          * software antenna diversity command to the driver.
 128          */
 129         if (!(ant->flags & ANTENNA_RX_DIVERSITY)) {
 130                 if (config.rx == ANTENNA_SW_DIVERSITY) {
 131                         ant->flags |= ANTENNA_RX_DIVERSITY;
 132
 133                         if (def->rx == ANTENNA_SW_DIVERSITY)
 134                                 config.rx = ANTENNA_B;
 135                         else
 136                                 config.rx = def->rx;
 137                 }
 138         } else if (config.rx == ANTENNA_SW_DIVERSITY)
 139                 config.rx = active->rx;
 140
 141         if (!(ant->flags & ANTENNA_TX_DIVERSITY)) {
 142                 if (config.tx == ANTENNA_SW_DIVERSITY) {
 143                         ant->flags |= ANTENNA_TX_DIVERSITY;
 144
 145                         if (def->tx == ANTENNA_SW_DIVERSITY)
 146                                 config.tx = ANTENNA_B;
 147                         else
 148                                 config.tx = def->tx;
 149                 }
 150         } else if (config.tx == ANTENNA_SW_DIVERSITY)
 151                 config.tx = active->tx;
 152
 153         /*
 154          * Antenna setup changes require the RX to be disabled,
 155          * else the changes will be ignored by the device.
 156          */
 157         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 158                 rt2x00queue_stop_queue(rt2x00dev->rx);
 159
 160         /*
 161          * Write new antenna setup to device and reset the link tuner.
 162          * The latter is required since we need to recalibrate the
 163          * noise-sensitivity ratio for the new setup.
 164          */
 165         rt2x00dev->ops->lib->config_ant(rt2x00dev, &config);
 166
 167         rt2x00link_reset_tuner(rt2x00dev, true);
 168
 169         memcpy(active, &config, sizeof(config));
 170
 171         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 172                 rt2x00queue_start_queue(rt2x00dev->rx);
 173 }
 174
 175 static u16 rt2x00ht_center_channel(struct rt2x00_dev *rt2x00dev,
 176                                    struct ieee80211_conf *conf)
 177 {
 178         struct hw_mode_spec *spec = &rt2x00dev->spec;
 179         int center_channel;
 180         u16 i;
 181
 182         /*
 183          * Initialize center channel to current channel.
 184          */
 185         center_channel = spec->channels[conf->chandef.chan->hw_value].channel;
 186
 187         /*
 188          * Adjust center channel to HT40+ and HT40- operation.
 189          */
 190         if (conf_is_ht40_plus(conf))
 191                 center_channel += 2;
 192         else if (conf_is_ht40_minus(conf))
 193                 center_channel -= (center_channel == 14) ? 1 : 2;
 194
 195         for (i = 0; i < spec->num_channels; i++)
 196                 if (spec->channels[i].channel == center_channel)
 197                         return i;
 198
 199         WARN_ON(1);
 200         return conf->chandef.chan->hw_value;
 201 }
 202
 203 void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
 204                       struct ieee80211_conf *conf,
 205                       unsigned int ieee80211_flags)
 206 {
 207         struct rt2x00lib_conf libconf;
 208         u16 hw_value;
 209         u16 autowake_timeout;
 210         u16 beacon_int;
 211         u16 beacon_diff;
 212
 213         memset(&libconf, 0, sizeof(libconf));
 214
 215         libconf.conf = conf;
 216
 217         if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL) {
 218                 if (!conf_is_ht(conf))
 219                         set_bit(CONFIG_HT_DISABLED, &rt2x00dev->flags);
 220                 else
 221                         clear_bit(CONFIG_HT_DISABLED, &rt2x00dev->flags);
 222
 223                 if (conf_is_ht40(conf)) {
 224                         set_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
 225                         hw_value = rt2x00ht_center_channel(rt2x00dev, conf);
 226                 } else {
 227                         clear_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
 228                         hw_value = conf->chandef.chan->hw_value;
 229                 }
 230
 231                 memcpy(&libconf.rf,
 232                        &rt2x00dev->spec.channels[hw_value],
 233                        sizeof(libconf.rf));
 234
 235                 memcpy(&libconf.channel,
 236                        &rt2x00dev->spec.channels_info[hw_value],
 237                        sizeof(libconf.channel));
 238
 239                 /* Used for VCO periodic calibration */
 240                 rt2x00dev->rf_channel = libconf.rf.channel;
 241         }
 242
 243         if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_PS_AUTOWAKE) &&
 244             (ieee80211_flags & IEEE80211_CONF_CHANGE_PS))
 245                 cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
 246
 247         /*
 248          * Start configuration.
 249          */
 250         rt2x00dev->ops->lib->config(rt2x00dev, &libconf, ieee80211_flags);
 251
 252         /*
 253          * Some configuration changes affect the link quality
 254          * which means we need to reset the link tuner.
 255          */
 256         if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL)
 257                 rt2x00link_reset_tuner(rt2x00dev, false);
 258
 259         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 260             rt2x00_has_cap_flag(rt2x00dev, REQUIRE_PS_AUTOWAKE) &&
 261             (ieee80211_flags & IEEE80211_CONF_CHANGE_PS) &&
 262             (conf->flags & IEEE80211_CONF_PS)) {
 263                 beacon_diff = (long)jiffies - (long)rt2x00dev->last_beacon;
 264                 beacon_int = msecs_to_jiffies(rt2x00dev->beacon_int);
 265
 266                 if (beacon_diff > beacon_int)
 267                         beacon_diff = 0;
 268
 269                 autowake_timeout = (conf->ps_dtim_period * beacon_int) - beacon_diff;
 270                 queue_delayed_work(rt2x00dev->workqueue,
 271                                    &rt2x00dev->autowakeup_work,
 272                                    autowake_timeout - 15);
 273         }
 274
 275         if (conf->flags & IEEE80211_CONF_PS)
 276                 set_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
 277         else
 278                 clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
 279
 280         rt2x00dev->curr_band = conf->chandef.chan->band;
 281         rt2x00dev->curr_freq = conf->chandef.chan->center_freq;
 282         rt2x00dev->tx_power = conf->power_level;
 283         rt2x00dev->short_retry = conf->short_frame_max_tx_count;
 284         rt2x00dev->long_retry = conf->long_frame_max_tx_count;
 285 }