/*
Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
<http://rt2x00.serialmonkey.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the
Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
Module: rt2x00lib
Abstract: rt2x00 generic configuration routines.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include "rt2x00.h"
#include "rt2x00lib.h"
void rt2x00lib_config_intf(struct rt2x00_dev *rt2x00dev,
struct rt2x00_intf *intf,
enum nl80211_iftype type,
u8 *mac, u8 *bssid)
{
struct rt2x00intf_conf conf;
unsigned int flags = 0;
conf.type = type;
switch (type) {
case NL80211_IFTYPE_ADHOC:
case NL80211_IFTYPE_AP:
conf.sync = TSF_SYNC_BEACON;
break;
case NL80211_IFTYPE_STATION:
conf.sync = TSF_SYNC_INFRA;
break;
default:
conf.sync = TSF_SYNC_NONE;
break;
}
/*
* Note that when NULL is passed as address we will send
* 00:00:00:00:00 to the device to clear the address.
* This will prevent the device being confused when it wants
* to ACK frames or consideres itself associated.
*/
memset(&conf.mac, 0, sizeof(conf.mac));
if (mac)
memcpy(&conf.mac, mac, ETH_ALEN);
memset(&conf.bssid, 0, sizeof(conf.bssid));
if (bssid)
memcpy(&conf.bssid, bssid, ETH_ALEN);
flags |= CONFIG_UPDATE_TYPE;
if (mac || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
flags |= CONFIG_UPDATE_MAC;
if (bssid || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
flags |= CONFIG_UPDATE_BSSID;
rt2x00dev->ops->lib->config_intf(rt2x00dev, intf, &conf, flags);
}
void rt2x00lib_config_erp(struct rt2x00_dev *rt2x00dev,
struct rt2x00_intf *intf,
struct ieee80211_bss_conf *bss_conf)
{
struct rt2x00lib_erp erp;
memset(&erp, 0, sizeof(erp));
erp.short_preamble = bss_conf->use_short_preamble;
erp.cts_protection = bss_conf->use_cts_prot;
erp.ack_timeout = PLCP + get_duration(ACK_SIZE, 10);
erp.ack_consume_time = SIFS + PLCP + get_duration(ACK_SIZE, 10);
if (rt2x00dev->hw->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME)
erp.ack_timeout += SHORT_DIFS;
else
erp.ack_timeout += DIFS;
if (bss_conf->use_short_preamble) {
erp.ack_timeout += SHORT_PREAMBLE;
erp.ack_consume_time += SHORT_PREAMBLE;
} else {
erp.ack_timeout += PREAMBLE;
erp.ack_consume_time += PREAMBLE;
}
rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp);
}
void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
enum antenna rx, enum antenna tx)
{
struct rt2x00lib_conf libconf;
libconf.ant.rx = rx;
libconf.ant.tx = tx;
if (rx == rt2x00dev->link.ant.active.rx &&
tx == rt2x00dev->link.ant.active.tx)
return;
/*
* Antenna setup changes require the RX to be disabled,
* else the changes will be ignored by the device.
*/
if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF_LINK);
/*
* Write new antenna setup to device and reset the link tuner.
* The latter is required since we need to recalibrate the
* noise-sensitivity ratio for the new setup.
*/
rt2x00dev->ops->lib->config(rt2x00dev, &libconf, CONFIG_UPDATE_ANTENNA);
rt2x00lib_reset_link_tuner(rt2x00dev);
rt2x00_reset_link_ant_rssi(&rt2x00dev->link);
rt2x00dev->link.ant.active.rx = libconf.ant.rx;
rt2x00dev->link.ant.active.tx = libconf.ant.tx;
if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON_LINK);
}
static u32 rt2x00lib_get_basic_rates(struct ieee80211_supported_band *band)
{
const struct rt2x00_rate *rate;
unsigned int i;
u32 mask = 0;
for (i = 0; i < band->n_bitrates; i++) {
rate = rt2x00_get_rate(band->bitrates[i].hw_value);
if (rate->flags & DEV_RATE_BASIC)
mask |= rate->ratemask;
}
return mask;
}
void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
struct ieee80211_conf *conf, const int force_config)
{
struct rt2x00lib_conf libconf;
struct ieee80211_supported_band *band;
struct antenna_setup *default_ant = &rt2x00dev->default_ant;
struct antenna_setup *active_ant = &rt2x00dev->link.ant.active;
int flags = 0;
int short_slot_time;
/*
* In some situations we want to force all configurations
* to be reloaded (When resuming for instance).
*/
if (force_config) {
flags = CONFIG_UPDATE_ALL;
goto config;
}
/*
* Check which configuration options have been
* updated and should be send to the device.
*/
if (rt2x00dev->rx_status.band != conf->channel->band)
flags |= CONFIG_UPDATE_PHYMODE;
if (rt2x00dev->rx_status.freq != conf->channel->center_freq)
flags |= CONFIG_UPDATE_CHANNEL;
if (rt2x00dev->tx_power != conf->power_level)
flags |= CONFIG_UPDATE_TXPOWER;
/*
* Determining changes in the antenna setups request several checks:
* antenna_sel_{r,t}x = 0
* -> Does active_{r,t}x match default_{r,t}x
* -> Is default_{r,t}x SW_DIVERSITY
* antenna_sel_{r,t}x = 1/2
* -> Does active_{r,t}x match antenna_sel_{r,t}x
* The reason for not updating the antenna while SW diversity
* should be used is simple: Software diversity means that
* we should switch between the antenna's based on the
* quality. This means that the current antenna is good enough
* to work with untill the link tuner decides that an antenna
* switch should be performed.
*/
if (!conf->antenna_sel_rx &&
default_ant->rx != ANTENNA_SW_DIVERSITY &&
default_ant->rx != active_ant->rx)
flags |= CONFIG_UPDATE_ANTENNA;
else if (conf->antenna_sel_rx &&
conf->antenna_sel_rx != active_ant->rx)
flags |= CONFIG_UPDATE_ANTENNA;
else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
flags |= CONFIG_UPDATE_ANTENNA;
if (!conf->antenna_sel_tx &&
default_ant->tx != ANTENNA_SW_DIVERSITY &&
default_ant->tx != active_ant->tx)
flags |= CONFIG_UPDATE_ANTENNA;
else if (conf->antenna_sel_tx &&
conf->antenna_sel_tx != active_ant->tx)
flags |= CONFIG_UPDATE_ANTENNA;
else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
flags |= CONFIG_UPDATE_ANTENNA;
/*
* The following configuration options are never
* stored anywhere and will always be updated.
*/
flags |= CONFIG_UPDATE_SLOT_TIME;
flags |= CONFIG_UPDATE_BEACON_INT;
/*
* We have determined what options should be updated,
* now precalculate device configuration values depending
* on what configuration options need to be updated.
*/
config:
memset(&libconf, 0, sizeof(libconf));
if (flags & CONFIG_UPDATE_PHYMODE) {
band = &rt2x00dev->bands[conf->channel->band];
libconf.band = conf->channel->band;
libconf.basic_rates = rt2x00lib_get_basic_rates(band);
}
if (flags & CONFIG_UPDATE_CHANNEL) {
memcpy(&libconf.rf,
&rt2x00dev->spec.channels[conf->channel->hw_value],
sizeof(libconf.rf));
memcpy(&libconf.channel,
&rt2x00dev->spec.channels_info[conf->channel->hw_value],
sizeof(libconf.channel));
}
if (flags & CONFIG_UPDATE_ANTENNA) {
if (conf->antenna_sel_rx)
libconf.ant.rx = conf->antenna_sel_rx;
else if (default_ant->rx != ANTENNA_SW_DIVERSITY)
libconf.ant.rx = default_ant->rx;
else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
libconf.ant.rx = ANTENNA_B;
else
libconf.ant.rx = active_ant->rx;
if (conf->antenna_sel_tx)
libconf.ant.tx = conf->antenna_sel_tx;
else if (default_ant->tx != ANTENNA_SW_DIVERSITY)
libconf.ant.tx = default_ant->tx;
else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
libconf.ant.tx = ANTENNA_B;
else
libconf.ant.tx = active_ant->tx;
}
if (flags & CONFIG_UPDATE_SLOT_TIME) {
short_slot_time = conf->flags & IEEE80211_CONF_SHORT_SLOT_TIME;
libconf.slot_time =
short_slot_time ? SHORT_SLOT_TIME : SLOT_TIME;
libconf.sifs = SIFS;
libconf.pifs = short_slot_time ? SHORT_PIFS : PIFS;
libconf.difs = short_slot_time ? SHORT_DIFS : DIFS;
libconf.eifs = short_slot_time ? SHORT_EIFS : EIFS;
}
libconf.conf = conf;
/*
* Start configuration.
*/
rt2x00dev->ops->lib->config(rt2x00dev, &libconf, flags);
/*
* Some configuration changes affect the link quality
* which means we need to reset the link tuner.
*/
if (flags & (CONFIG_UPDATE_CHANNEL | CONFIG_UPDATE_ANTENNA))
rt2x00lib_reset_link_tuner(rt2x00dev);
if (flags & CONFIG_UPDATE_PHYMODE) {
rt2x00dev->curr_band = conf->channel->band;
rt2x00dev->rx_status.band = conf->channel->band;
}
rt2x00dev->rx_status.freq = conf->channel->center_freq;
rt2x00dev->tx_power = conf->power_level;
if (flags & CONFIG_UPDATE_ANTENNA) {
rt2x00dev->link.ant.active.rx = libconf.ant.rx;
rt2x00dev->link.ant.active.tx = libconf.ant.tx;
}
}
