linux/drivers/net/wireless/rt2x00/rt2x00config.c
Ivo van Doorn 1c0bcf89d8 rt2x00: Add autowake support for USB hardware
The USB drivers don't support automatically waking up when in powersaving mode,
add a work object which will wakeup the device in time to receive the next beacon.
Based on that beacon, we either go back into powersaving mode, or we remain awake
to receive the buffered frames for our station.

Some part of the code, especially rt2x00lib_find_ie and rt2x00lib_rxdone_check_ps
are inspired on the code from carl9170.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-05-02 14:49:19 -04:00

279 lines
7.8 KiB
C

/*
Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
<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,
const u8 *mac, const u8 *bssid)
{
struct rt2x00intf_conf conf;
unsigned int flags = 0;
conf.type = type;
switch (type) {
case NL80211_IFTYPE_ADHOC:
conf.sync = TSF_SYNC_ADHOC;
break;
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_MESH_POINT:
case NL80211_IFTYPE_WDS:
conf.sync = TSF_SYNC_AP_NONE;
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,
u32 changed)
{
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.slot_time = bss_conf->use_short_slot ? SHORT_SLOT_TIME : SLOT_TIME;
erp.sifs = SIFS;
erp.pifs = bss_conf->use_short_slot ? SHORT_PIFS : PIFS;
erp.difs = bss_conf->use_short_slot ? SHORT_DIFS : DIFS;
erp.eifs = bss_conf->use_short_slot ? SHORT_EIFS : EIFS;
erp.basic_rates = bss_conf->basic_rates;
erp.beacon_int = bss_conf->beacon_int;
/* Update the AID, this is needed for dynamic PS support */
rt2x00dev->aid = bss_conf->assoc ? bss_conf->aid : 0;
rt2x00dev->last_beacon = bss_conf->timestamp;
/* Update global beacon interval time, this is needed for PS support */
rt2x00dev->beacon_int = bss_conf->beacon_int;
if (changed & BSS_CHANGED_HT)
erp.ht_opmode = bss_conf->ht_operation_mode;
rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp, changed);
}
void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
struct antenna_setup config)
{
struct link_ant *ant = &rt2x00dev->link.ant;
struct antenna_setup *def = &rt2x00dev->default_ant;
struct antenna_setup *active = &rt2x00dev->link.ant.active;
/*
* When the caller tries to send the SW diversity,
* we must update the ANTENNA_RX_DIVERSITY flag to
* enable the antenna diversity in the link tuner.
*
* Secondly, we must guarentee we never send the
* software antenna diversity command to the driver.
*/
if (!(ant->flags & ANTENNA_RX_DIVERSITY)) {
if (config.rx == ANTENNA_SW_DIVERSITY) {
ant->flags |= ANTENNA_RX_DIVERSITY;
if (def->rx == ANTENNA_SW_DIVERSITY)
config.rx = ANTENNA_B;
else
config.rx = def->rx;
}
} else if (config.rx == ANTENNA_SW_DIVERSITY)
config.rx = active->rx;
if (!(ant->flags & ANTENNA_TX_DIVERSITY)) {
if (config.tx == ANTENNA_SW_DIVERSITY) {
ant->flags |= ANTENNA_TX_DIVERSITY;
if (def->tx == ANTENNA_SW_DIVERSITY)
config.tx = ANTENNA_B;
else
config.tx = def->tx;
}
} else if (config.tx == ANTENNA_SW_DIVERSITY)
config.tx = active->tx;
/*
* 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))
rt2x00queue_stop_queue(rt2x00dev->rx);
/*
* 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_ant(rt2x00dev, &config);
rt2x00link_reset_tuner(rt2x00dev, true);
memcpy(active, &config, sizeof(config));
if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
rt2x00queue_start_queue(rt2x00dev->rx);
}
static u16 rt2x00ht_center_channel(struct rt2x00_dev *rt2x00dev,
struct ieee80211_conf *conf)
{
struct hw_mode_spec *spec = &rt2x00dev->spec;
int center_channel;
u16 i;
/*
* Initialize center channel to current channel.
*/
center_channel = spec->channels[conf->channel->hw_value].channel;
/*
* Adjust center channel to HT40+ and HT40- operation.
*/
if (conf_is_ht40_plus(conf))
center_channel += 2;
else if (conf_is_ht40_minus(conf))
center_channel -= (center_channel == 14) ? 1 : 2;
for (i = 0; i < spec->num_channels; i++)
if (spec->channels[i].channel == center_channel)
return i;
WARN_ON(1);
return conf->channel->hw_value;
}
void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
struct ieee80211_conf *conf,
unsigned int ieee80211_flags)
{
struct rt2x00lib_conf libconf;
u16 hw_value;
u16 autowake_timeout;
u16 beacon_int;
u16 beacon_diff;
memset(&libconf, 0, sizeof(libconf));
libconf.conf = conf;
if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL) {
if (conf_is_ht40(conf)) {
set_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
hw_value = rt2x00ht_center_channel(rt2x00dev, conf);
} else {
clear_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
hw_value = conf->channel->hw_value;
}
memcpy(&libconf.rf,
&rt2x00dev->spec.channels[hw_value],
sizeof(libconf.rf));
memcpy(&libconf.channel,
&rt2x00dev->spec.channels_info[hw_value],
sizeof(libconf.channel));
}
if (test_bit(REQUIRE_PS_AUTOWAKE, &rt2x00dev->cap_flags) &&
(ieee80211_flags & IEEE80211_CONF_CHANGE_PS))
cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
/*
* Start configuration.
*/
rt2x00dev->ops->lib->config(rt2x00dev, &libconf, ieee80211_flags);
/*
* Some configuration changes affect the link quality
* which means we need to reset the link tuner.
*/
if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL)
rt2x00link_reset_tuner(rt2x00dev, false);
if (test_bit(REQUIRE_PS_AUTOWAKE, &rt2x00dev->cap_flags) &&
(ieee80211_flags & IEEE80211_CONF_CHANGE_PS) &&
(conf->flags & IEEE80211_CONF_PS)) {
beacon_diff = (long)jiffies - (long)rt2x00dev->last_beacon;
beacon_int = msecs_to_jiffies(rt2x00dev->beacon_int);
if (beacon_diff > beacon_int)
beacon_diff = 0;
autowake_timeout = (conf->max_sleep_period * beacon_int) - beacon_diff;
queue_delayed_work(rt2x00dev->workqueue,
&rt2x00dev->autowakeup_work,
autowake_timeout - 15);
}
if (conf->flags & IEEE80211_CONF_PS)
set_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
else
clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
rt2x00dev->curr_band = conf->channel->band;
rt2x00dev->curr_freq = conf->channel->center_freq;
rt2x00dev->tx_power = conf->power_level;
rt2x00dev->short_retry = conf->short_frame_max_tx_count;
rt2x00dev->long_retry = conf->long_frame_max_tx_count;
}