rt2x00: Move link tuning into seperate file
Move link and antenna tuning into a seperate file named rt2x00link.c,
this makes the interface to the link tuner a lot cleaner.
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/Makefile b/drivers/net/wireless/rt2x00/Makefile
index 917cb4f..f22d808 100644
--- a/drivers/net/wireless/rt2x00/Makefile
+++ b/drivers/net/wireless/rt2x00/Makefile
@@ -2,6 +2,7 @@
rt2x00lib-y += rt2x00mac.o
rt2x00lib-y += rt2x00config.o
rt2x00lib-y += rt2x00queue.o
+rt2x00lib-y += rt2x00link.o
rt2x00lib-$(CONFIG_RT2X00_LIB_DEBUGFS) += rt2x00debug.o
rt2x00lib-$(CONFIG_RT2X00_LIB_CRYPTO) += rt2x00crypto.o
rt2x00lib-$(CONFIG_RT2X00_LIB_RFKILL) += rt2x00rfkill.o
diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index 39ecf3b..19c0687 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -212,7 +212,7 @@
* (WEIGHT_TX * tx_percentage) +
* (WEIGHT_RX * rx_percentage)) / 100
*
- * This value should then be checked to not be greated then 100.
+ * This value should then be checked to not be greater then 100.
*/
int rx_percentage;
int rx_success;
@@ -318,33 +318,6 @@
return DEFAULT_RSSI;
}
-static inline int rt2x00_get_link_ant_rssi(struct link *link)
-{
- if (link->ant.rssi_ant && link->qual.rx_success)
- return link->ant.rssi_ant;
- return DEFAULT_RSSI;
-}
-
-static inline void rt2x00_reset_link_ant_rssi(struct link *link)
-{
- link->ant.rssi_ant = 0;
-}
-
-static inline int rt2x00_get_link_ant_rssi_history(struct link *link,
- enum antenna ant)
-{
- if (link->ant.rssi_history[ant - ANTENNA_A])
- return link->ant.rssi_history[ant - ANTENNA_A];
- return DEFAULT_RSSI;
-}
-
-static inline int rt2x00_update_ant_rssi(struct link *link, int rssi)
-{
- int old_rssi = link->ant.rssi_history[link->ant.active.rx - ANTENNA_A];
- link->ant.rssi_history[link->ant.active.rx - ANTENNA_A] = rssi;
- return old_rssi;
-}
-
/*
* Interface structure
* Per interface configuration details, this structure
diff --git a/drivers/net/wireless/rt2x00/rt2x00config.c b/drivers/net/wireless/rt2x00/rt2x00config.c
index e66fb31..2f4cb8d 100644
--- a/drivers/net/wireless/rt2x00/rt2x00config.c
+++ b/drivers/net/wireless/rt2x00/rt2x00config.c
@@ -152,8 +152,7 @@
*/
rt2x00dev->ops->lib->config_ant(rt2x00dev, ant);
- rt2x00lib_reset_link_tuner(rt2x00dev);
- rt2x00_reset_link_ant_rssi(&rt2x00dev->link);
+ rt2x00link_reset_tuner(rt2x00dev, true);
memcpy(active, ant, sizeof(*ant));
@@ -191,7 +190,7 @@
* which means we need to reset the link tuner.
*/
if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL)
- rt2x00lib_reset_link_tuner(rt2x00dev);
+ rt2x00link_reset_tuner(rt2x00dev, false);
rt2x00dev->curr_band = conf->channel->band;
rt2x00dev->tx_power = conf->power_level;
diff --git a/drivers/net/wireless/rt2x00/rt2x00debug.c b/drivers/net/wireless/rt2x00/rt2x00debug.c
index 54dd100..cc19406 100644
--- a/drivers/net/wireless/rt2x00/rt2x00debug.c
+++ b/drivers/net/wireless/rt2x00/rt2x00debug.c
@@ -130,9 +130,11 @@
};
void rt2x00debug_update_crypto(struct rt2x00_dev *rt2x00dev,
- enum cipher cipher, enum rx_crypto status)
+ struct rxdone_entry_desc *rxdesc)
{
struct rt2x00debug_intf *intf = rt2x00dev->debugfs_intf;
+ enum cipher cipher = rxdesc->cipher;
+ enum rx_crypto status = rxdesc->cipher_status;
if (cipher == CIPHER_TKIP_NO_MIC)
cipher = CIPHER_TKIP;
diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index 87c0f2c..81d7fc8 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -30,60 +30,6 @@
#include "rt2x00lib.h"
/*
- * Link tuning handlers
- */
-void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
-{
- if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
- return;
-
- /*
- * Reset link information.
- * Both the currently active vgc level as well as
- * the link tuner counter should be reset. Resetting
- * the counter is important for devices where the
- * device should only perform link tuning during the
- * first minute after being enabled.
- */
- rt2x00dev->link.count = 0;
- rt2x00dev->link.vgc_level = 0;
-
- /*
- * Reset the link tuner.
- */
- rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
-}
-
-static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
-{
- /*
- * Clear all (possibly) pre-existing quality statistics.
- */
- memset(&rt2x00dev->link.qual, 0, sizeof(rt2x00dev->link.qual));
-
- /*
- * The RX and TX percentage should start at 50%
- * this will assure we will get at least get some
- * decent value when the link tuner starts.
- * The value will be dropped and overwritten with
- * the correct (measured )value anyway during the
- * first run of the link tuner.
- */
- rt2x00dev->link.qual.rx_percentage = 50;
- rt2x00dev->link.qual.tx_percentage = 50;
-
- rt2x00lib_reset_link_tuner(rt2x00dev);
-
- queue_delayed_work(rt2x00dev->hw->workqueue,
- &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
-}
-
-static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
-{
- cancel_delayed_work_sync(&rt2x00dev->link.work);
-}
-
-/*
* Radio control handlers.
*/
int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
@@ -161,238 +107,15 @@
* When we are disabling the RX, we should also stop the link tuner.
*/
if (state == STATE_RADIO_RX_OFF)
- rt2x00lib_stop_link_tuner(rt2x00dev);
+ rt2x00link_stop_tuner(rt2x00dev);
rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
/*
* When we are enabling the RX, we should also start the link tuner.
*/
- if (state == STATE_RADIO_RX_ON &&
- (rt2x00dev->intf_ap_count || rt2x00dev->intf_sta_count))
- rt2x00lib_start_link_tuner(rt2x00dev);
-}
-
-static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
-{
- struct antenna_setup ant;
- int sample_a =
- rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
- int sample_b =
- rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
-
- memcpy(&ant, &rt2x00dev->link.ant.active, sizeof(ant));
-
- /*
- * We are done sampling. Now we should evaluate the results.
- */
- rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
-
- /*
- * During the last period we have sampled the RSSI
- * from both antenna's. It now is time to determine
- * which antenna demonstrated the best performance.
- * When we are already on the antenna with the best
- * performance, then there really is nothing for us
- * left to do.
- */
- if (sample_a == sample_b)
- return;
-
- if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
- ant.rx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
-
- if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
- ant.tx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
-
- rt2x00lib_config_antenna(rt2x00dev, &ant);
-}
-
-static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
-{
- struct antenna_setup ant;
- int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
- int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
-
- memcpy(&ant, &rt2x00dev->link.ant.active, sizeof(ant));
-
- /*
- * Legacy driver indicates that we should swap antenna's
- * when the difference in RSSI is greater that 5. This
- * also should be done when the RSSI was actually better
- * then the previous sample.
- * When the difference exceeds the threshold we should
- * sample the rssi from the other antenna to make a valid
- * comparison between the 2 antennas.
- */
- if (abs(rssi_curr - rssi_old) < 5)
- return;
-
- rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
-
- if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
- ant.rx = (ant.rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
-
- if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
- ant.tx = (ant.tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
-
- rt2x00lib_config_antenna(rt2x00dev, &ant);
-}
-
-static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
-{
- /*
- * Determine if software diversity is enabled for
- * either the TX or RX antenna (or both).
- * Always perform this check since within the link
- * tuner interval the configuration might have changed.
- */
- rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
- rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
-
- if (rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
- rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
- if (rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
- rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
-
- if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
- !(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
- rt2x00dev->link.ant.flags = 0;
- return;
- }
-
- /*
- * If we have only sampled the data over the last period
- * we should now harvest the data. Otherwise just evaluate
- * the data. The latter should only be performed once
- * every 2 seconds.
- */
- if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
- rt2x00lib_evaluate_antenna_sample(rt2x00dev);
- else if (rt2x00dev->link.count & 1)
- rt2x00lib_evaluate_antenna_eval(rt2x00dev);
-}
-
-static void rt2x00lib_update_link_stats(struct link *link, int rssi)
-{
- int avg_rssi = rssi;
-
- /*
- * Update global RSSI
- */
- if (link->qual.avg_rssi)
- avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
- link->qual.avg_rssi = avg_rssi;
-
- /*
- * Update antenna RSSI
- */
- if (link->ant.rssi_ant)
- rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
- link->ant.rssi_ant = rssi;
-}
-
-static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
-{
- if (qual->rx_failed || qual->rx_success)
- qual->rx_percentage =
- (qual->rx_success * 100) /
- (qual->rx_failed + qual->rx_success);
- else
- qual->rx_percentage = 50;
-
- if (qual->tx_failed || qual->tx_success)
- qual->tx_percentage =
- (qual->tx_success * 100) /
- (qual->tx_failed + qual->tx_success);
- else
- qual->tx_percentage = 50;
-
- qual->rx_success = 0;
- qual->rx_failed = 0;
- qual->tx_success = 0;
- qual->tx_failed = 0;
-}
-
-static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
- int rssi)
-{
- int rssi_percentage = 0;
- int signal;
-
- /*
- * We need a positive value for the RSSI.
- */
- if (rssi < 0)
- rssi += rt2x00dev->rssi_offset;
-
- /*
- * Calculate the different percentages,
- * which will be used for the signal.
- */
- if (rt2x00dev->rssi_offset)
- rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
-
- /*
- * Add the individual percentages and use the WEIGHT
- * defines to calculate the current link signal.
- */
- signal = ((WEIGHT_RSSI * rssi_percentage) +
- (WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
- (WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
-
- return (signal > 100) ? 100 : signal;
-}
-
-static void rt2x00lib_link_tuner(struct work_struct *work)
-{
- struct rt2x00_dev *rt2x00dev =
- container_of(work, struct rt2x00_dev, link.work.work);
-
- /*
- * When the radio is shutting down we should
- * immediately cease all link tuning.
- */
- if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
- return;
-
- /*
- * Update statistics.
- */
- rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
- rt2x00dev->low_level_stats.dot11FCSErrorCount +=
- rt2x00dev->link.qual.rx_failed;
-
- /*
- * Only perform the link tuning when Link tuning
- * has been enabled (This could have been disabled from the EEPROM).
- */
- if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
- rt2x00dev->ops->lib->link_tuner(rt2x00dev);
-
- /*
- * Precalculate a portion of the link signal which is
- * in based on the tx/rx success/failure counters.
- */
- rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
-
- /*
- * Send a signal to the led to update the led signal strength.
- */
- rt2x00leds_led_quality(rt2x00dev, rt2x00dev->link.qual.avg_rssi);
-
- /*
- * Evaluate antenna setup, make this the last step since this could
- * possibly reset some statistics.
- */
- rt2x00lib_evaluate_antenna(rt2x00dev);
-
- /*
- * Increase tuner counter, and reschedule the next link tuner run.
- */
- rt2x00dev->link.count++;
- queue_delayed_work(rt2x00dev->hw->workqueue,
- &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
+ if (state == STATE_RADIO_RX_ON)
+ rt2x00link_start_tuner(rt2x00dev);
}
static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
@@ -597,7 +320,6 @@
struct sk_buff *skb;
struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
struct ieee80211_supported_band *sband;
- struct ieee80211_hdr *hdr;
const struct rt2x00_rate *rate;
unsigned int header_length;
unsigned int align;
@@ -674,23 +396,14 @@
}
/*
- * Only update link status if this is a beacon frame carrying our bssid.
+ * Update extra components
*/
- hdr = (struct ieee80211_hdr *)entry->skb->data;
- if (ieee80211_is_beacon(hdr->frame_control) &&
- (rxdesc.dev_flags & RXDONE_MY_BSS))
- rt2x00lib_update_link_stats(&rt2x00dev->link, rxdesc.rssi);
-
- rt2x00debug_update_crypto(rt2x00dev,
- rxdesc.cipher,
- rxdesc.cipher_status);
-
- rt2x00dev->link.qual.rx_success++;
+ rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
+ rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
rx_status->mactime = rxdesc.timestamp;
rx_status->rate_idx = idx;
- rx_status->qual =
- rt2x00lib_calculate_link_signal(rt2x00dev, rxdesc.rssi);
+ rx_status->qual = rt2x00link_calculate_signal(rt2x00dev, rxdesc.rssi);
rx_status->signal = rxdesc.rssi;
rx_status->flag = rxdesc.flags;
rx_status->antenna = rt2x00dev->link.ant.active.rx;
@@ -1083,7 +796,6 @@
*/
INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
- INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
/*
* Allocate queue array.
@@ -1104,6 +816,7 @@
/*
* Register extra components.
*/
+ rt2x00link_register(rt2x00dev);
rt2x00leds_register(rt2x00dev);
rt2x00rfkill_allocate(rt2x00dev);
rt2x00debug_register(rt2x00dev);
diff --git a/drivers/net/wireless/rt2x00/rt2x00lib.h b/drivers/net/wireless/rt2x00/rt2x00lib.h
index 86cd26f..fccaffd 100644
--- a/drivers/net/wireless/rt2x00/rt2x00lib.h
+++ b/drivers/net/wireless/rt2x00/rt2x00lib.h
@@ -63,7 +63,6 @@
int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev);
void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev);
void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state);
-void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev);
/*
* Initialization handlers.
@@ -154,6 +153,81 @@
int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev);
void rt2x00queue_free(struct rt2x00_dev *rt2x00dev);
+/**
+ * rt2x00link_update_stats - Update link statistics from RX frame
+ * @rt2x00dev: Pointer to &struct rt2x00_dev.
+ * @skb: Received frame
+ * @rxdesc: Received frame descriptor
+ *
+ * Update link statistics based on the information from the
+ * received frame descriptor.
+ */
+void rt2x00link_update_stats(struct rt2x00_dev *rt2x00dev,
+ struct sk_buff *skb,
+ struct rxdone_entry_desc *rxdesc);
+
+/**
+ * rt2x00link_calculate_signal - Calculate signal quality
+ * @rt2x00dev: Pointer to &struct rt2x00_dev.
+ * @rssi: RX Frame RSSI
+ *
+ * Calculate the signal quality of a frame based on the rssi
+ * measured during the receiving of the frame and the global
+ * link quality statistics measured since the start of the
+ * link tuning. The result is a value between 0 and 100 which
+ * is an indication of the signal quality.
+ */
+int rt2x00link_calculate_signal(struct rt2x00_dev *rt2x00dev, int rssi);
+
+/**
+ * rt2x00link_start_tuner - Start periodic link tuner work
+ * @rt2x00dev: Pointer to &struct rt2x00_dev.
+ *
+ * This start the link tuner periodic work, this work will
+ * be executed periodically until &rt2x00link_stop_tuner has
+ * been called.
+ */
+void rt2x00link_start_tuner(struct rt2x00_dev *rt2x00dev);
+
+/**
+ * rt2x00link_stop_tuner - Stop periodic link tuner work
+ * @rt2x00dev: Pointer to &struct rt2x00_dev.
+ *
+ * After this function completed the link tuner will not
+ * be running until &rt2x00link_start_tuner is called.
+ */
+void rt2x00link_stop_tuner(struct rt2x00_dev *rt2x00dev);
+
+/**
+ * rt2x00link_reset_tuner - Reset periodic link tuner work
+ * @rt2x00dev: Pointer to &struct rt2x00_dev.
+ * @antenna: Should the antenna tuning also be reset
+ *
+ * The VGC limit configured in the hardware will be reset to 0
+ * which forces the driver to rediscover the correct value for
+ * the current association. This is needed when configuration
+ * options have changed which could drastically change the
+ * SNR level or link quality (i.e. changing the antenna setting).
+ *
+ * Resetting the link tuner will also cause the periodic work counter
+ * to be reset. Any driver which has a fixed limit on the number
+ * of rounds the link tuner is supposed to work will accept the
+ * tuner actions again if this limit was previously reached.
+ *
+ * If @antenna is set to true a the software antenna diversity
+ * tuning will also be reset.
+ */
+void rt2x00link_reset_tuner(struct rt2x00_dev *rt2x00dev, bool antenna);
+
+/**
+ * rt2x00link_register - Initialize link tuning functionality
+ * @rt2x00dev: Pointer to &struct rt2x00_dev.
+ *
+ * Initialize work structure and all link tuning related
+ * paramters. This will not start the link tuning process itself.
+ */
+void rt2x00link_register(struct rt2x00_dev *rt2x00dev);
+
/*
* Firmware handlers.
*/
@@ -179,7 +253,7 @@
void rt2x00debug_dump_frame(struct rt2x00_dev *rt2x00dev,
enum rt2x00_dump_type type, struct sk_buff *skb);
void rt2x00debug_update_crypto(struct rt2x00_dev *rt2x00dev,
- enum cipher cipher, enum rx_crypto status);
+ struct rxdone_entry_desc *rxdesc);
#else
static inline void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
{
@@ -196,8 +270,7 @@
}
static inline void rt2x00debug_update_crypto(struct rt2x00_dev *rt2x00dev,
- enum cipher cipher,
- enum rx_crypto status)
+ struct rxdone_entry_desc *rxdesc)
{
}
#endif /* CONFIG_RT2X00_LIB_DEBUGFS */
diff --git a/drivers/net/wireless/rt2x00/rt2x00link.c b/drivers/net/wireless/rt2x00/rt2x00link.c
new file mode 100644
index 0000000..0462d5a
--- /dev/null
+++ b/drivers/net/wireless/rt2x00/rt2x00link.c
@@ -0,0 +1,402 @@
+/*
+ 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 link tuning routines.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include "rt2x00.h"
+#include "rt2x00lib.h"
+
+static int rt2x00link_antenna_get_link_rssi(struct rt2x00_dev *rt2x00dev)
+{
+ struct link_ant *ant = &rt2x00dev->link.ant;
+
+ if (ant->rssi_ant && rt2x00dev->link.qual.rx_success)
+ return ant->rssi_ant;
+ return DEFAULT_RSSI;
+}
+
+static int rt2x00link_antenna_get_rssi_history(struct rt2x00_dev *rt2x00dev,
+ enum antenna antenna)
+{
+ struct link_ant *ant = &rt2x00dev->link.ant;
+
+ if (ant->rssi_history[antenna - ANTENNA_A])
+ return ant->rssi_history[antenna - ANTENNA_A];
+ return DEFAULT_RSSI;
+}
+/* Small wrapper for rt2x00link_antenna_get_rssi_history() */
+#define rt2x00link_antenna_get_rssi_rx_history(__dev) \
+ rt2x00link_antenna_get_rssi_history((__dev), \
+ (__dev)->link.ant.active.rx)
+#define rt2x00link_antenna_get_rssi_tx_history(__dev) \
+ rt2x00link_antenna_get_rssi_history((__dev), \
+ (__dev)->link.ant.active.tx)
+
+static void rt2x00link_antenna_update_rssi_history(struct rt2x00_dev *rt2x00dev,
+ enum antenna antenna,
+ int rssi)
+{
+ struct link_ant *ant = &rt2x00dev->link.ant;
+ ant->rssi_history[ant->active.rx - ANTENNA_A] = rssi;
+}
+/* Small wrapper for rt2x00link_antenna_get_rssi_history() */
+#define rt2x00link_antenna_update_rssi_rx_history(__dev, __rssi) \
+ rt2x00link_antenna_update_rssi_history((__dev), \
+ (__dev)->link.ant.active.rx, \
+ (__rssi))
+#define rt2x00link_antenna_update_rssi_tx_history(__dev, __rssi) \
+ rt2x00link_antenna_update_rssi_history((__dev), \
+ (__dev)->link.ant.active.tx, \
+ (__rssi))
+
+static void rt2x00link_antenna_reset(struct rt2x00_dev *rt2x00dev)
+{
+ rt2x00dev->link.ant.rssi_ant = 0;
+}
+
+static void rt2x00lib_antenna_diversity_sample(struct rt2x00_dev *rt2x00dev)
+{
+ struct link_ant *ant = &rt2x00dev->link.ant;
+ struct antenna_setup new_ant;
+ int sample_a = rt2x00link_antenna_get_rssi_history(rt2x00dev, ANTENNA_A);
+ int sample_b = rt2x00link_antenna_get_rssi_history(rt2x00dev, ANTENNA_B);
+
+ memcpy(&new_ant, &ant->active, sizeof(new_ant));
+
+ /*
+ * We are done sampling. Now we should evaluate the results.
+ */
+ ant->flags &= ~ANTENNA_MODE_SAMPLE;
+
+ /*
+ * During the last period we have sampled the RSSI
+ * from both antenna's. It now is time to determine
+ * which antenna demonstrated the best performance.
+ * When we are already on the antenna with the best
+ * performance, then there really is nothing for us
+ * left to do.
+ */
+ if (sample_a == sample_b)
+ return;
+
+ if (ant->flags & ANTENNA_RX_DIVERSITY)
+ new_ant.rx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
+
+ if (ant->flags & ANTENNA_TX_DIVERSITY)
+ new_ant.tx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
+
+ rt2x00lib_config_antenna(rt2x00dev, &new_ant);
+}
+
+static void rt2x00lib_antenna_diversity_eval(struct rt2x00_dev *rt2x00dev)
+{
+ struct link_ant *ant = &rt2x00dev->link.ant;
+ struct antenna_setup new_ant;
+ int rssi_curr;
+ int rssi_old;
+
+ memcpy(&new_ant, &ant->active, sizeof(new_ant));
+
+ /*
+ * Get current RSSI value along with the historical value,
+ * after that update the history with the current value.
+ */
+ rssi_curr = rt2x00link_antenna_get_link_rssi(rt2x00dev);
+ rssi_old = rt2x00link_antenna_get_rssi_rx_history(rt2x00dev);
+ rt2x00link_antenna_update_rssi_rx_history(rt2x00dev, rssi_curr);
+
+ /*
+ * Legacy driver indicates that we should swap antenna's
+ * when the difference in RSSI is greater that 5. This
+ * also should be done when the RSSI was actually better
+ * then the previous sample.
+ * When the difference exceeds the threshold we should
+ * sample the rssi from the other antenna to make a valid
+ * comparison between the 2 antennas.
+ */
+ if (abs(rssi_curr - rssi_old) < 5)
+ return;
+
+ ant->flags |= ANTENNA_MODE_SAMPLE;
+
+ if (ant->flags & ANTENNA_RX_DIVERSITY)
+ new_ant.rx = (new_ant.rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
+
+ if (ant->flags & ANTENNA_TX_DIVERSITY)
+ new_ant.tx = (new_ant.tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
+
+ rt2x00lib_config_antenna(rt2x00dev, &new_ant);
+}
+
+static void rt2x00lib_antenna_diversity(struct rt2x00_dev *rt2x00dev)
+{
+ struct link_ant *ant = &rt2x00dev->link.ant;
+
+ /*
+ * Determine if software diversity is enabled for
+ * either the TX or RX antenna (or both).
+ * Always perform this check since within the link
+ * tuner interval the configuration might have changed.
+ */
+ ant->flags &= ~ANTENNA_RX_DIVERSITY;
+ ant->flags &= ~ANTENNA_TX_DIVERSITY;
+
+ if (rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
+ ant->flags |= ANTENNA_RX_DIVERSITY;
+ if (rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
+ ant->flags |= ANTENNA_TX_DIVERSITY;
+
+ if (!(ant->flags & ANTENNA_RX_DIVERSITY) &&
+ !(ant->flags & ANTENNA_TX_DIVERSITY)) {
+ ant->flags = 0;
+ return;
+ }
+
+ /*
+ * If we have only sampled the data over the last period
+ * we should now harvest the data. Otherwise just evaluate
+ * the data. The latter should only be performed once
+ * every 2 seconds.
+ */
+ if (ant->flags & ANTENNA_MODE_SAMPLE)
+ rt2x00lib_antenna_diversity_sample(rt2x00dev);
+ else if (rt2x00dev->link.count & 1)
+ rt2x00lib_antenna_diversity_eval(rt2x00dev);
+}
+
+void rt2x00link_update_stats(struct rt2x00_dev *rt2x00dev,
+ struct sk_buff *skb,
+ struct rxdone_entry_desc *rxdesc)
+{
+ struct link_qual *qual = &rt2x00dev->link.qual;
+ struct link_ant *ant = &rt2x00dev->link.ant;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ int avg_rssi = rxdesc->rssi;
+ int ant_rssi = rxdesc->rssi;
+
+ /*
+ * Frame was received successfully since non-succesfull
+ * frames would have been dropped by the hardware.
+ */
+ qual->rx_success++;
+
+ /*
+ * We are only interested in quality statistics from
+ * beacons which came from the BSS which we are
+ * associated with.
+ */
+ if (!ieee80211_is_beacon(hdr->frame_control) ||
+ !(rxdesc->dev_flags & RXDONE_MY_BSS))
+ return;
+
+ /*
+ * Update global RSSI
+ */
+ if (qual->avg_rssi)
+ avg_rssi = MOVING_AVERAGE(qual->avg_rssi, rxdesc->rssi, 8);
+ qual->avg_rssi = avg_rssi;
+
+ /*
+ * Update antenna RSSI
+ */
+ if (ant->rssi_ant)
+ ant_rssi = MOVING_AVERAGE(ant->rssi_ant, rxdesc->rssi, 8);
+ ant->rssi_ant = ant_rssi;
+}
+
+static void rt2x00link_precalculate_signal(struct rt2x00_dev *rt2x00dev)
+{
+ struct link_qual *qual = &rt2x00dev->link.qual;
+
+ if (qual->rx_failed || qual->rx_success)
+ qual->rx_percentage =
+ (qual->rx_success * 100) /
+ (qual->rx_failed + qual->rx_success);
+ else
+ qual->rx_percentage = 50;
+
+ if (qual->tx_failed || qual->tx_success)
+ qual->tx_percentage =
+ (qual->tx_success * 100) /
+ (qual->tx_failed + qual->tx_success);
+ else
+ qual->tx_percentage = 50;
+
+ qual->rx_success = 0;
+ qual->rx_failed = 0;
+ qual->tx_success = 0;
+ qual->tx_failed = 0;
+}
+
+int rt2x00link_calculate_signal(struct rt2x00_dev *rt2x00dev, int rssi)
+{
+ struct link_qual *qual = &rt2x00dev->link.qual;
+ int rssi_percentage = 0;
+ int signal;
+
+ /*
+ * We need a positive value for the RSSI.
+ */
+ if (rssi < 0)
+ rssi += rt2x00dev->rssi_offset;
+
+ /*
+ * Calculate the different percentages,
+ * which will be used for the signal.
+ */
+ rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
+
+ /*
+ * Add the individual percentages and use the WEIGHT
+ * defines to calculate the current link signal.
+ */
+ signal = ((WEIGHT_RSSI * rssi_percentage) +
+ (WEIGHT_TX * qual->tx_percentage) +
+ (WEIGHT_RX * qual->rx_percentage)) / 100;
+
+ return max_t(int, signal, 100);
+}
+
+void rt2x00link_start_tuner(struct rt2x00_dev *rt2x00dev)
+{
+ struct link_qual *qual = &rt2x00dev->link.qual;
+
+ /*
+ * Link tuning should only be performed when
+ * an active sta or master interface exists.
+ * Single monitor mode interfaces should never have
+ * work with link tuners.
+ */
+ if (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count)
+ return;
+
+ /*
+ * Clear all (possibly) pre-existing quality statistics.
+ */
+ memset(qual, 0, sizeof(*qual));
+
+ /*
+ * The RX and TX percentage should start at 50%
+ * this will assure we will get at least get some
+ * decent value when the link tuner starts.
+ * The value will be dropped and overwritten with
+ * the correct (measured) value anyway during the
+ * first run of the link tuner.
+ */
+ qual->rx_percentage = 50;
+ qual->tx_percentage = 50;
+
+ rt2x00link_reset_tuner(rt2x00dev, false);
+
+ queue_delayed_work(rt2x00dev->hw->workqueue,
+ &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
+}
+
+void rt2x00link_stop_tuner(struct rt2x00_dev *rt2x00dev)
+{
+ cancel_delayed_work_sync(&rt2x00dev->link.work);
+}
+
+void rt2x00link_reset_tuner(struct rt2x00_dev *rt2x00dev, bool antenna)
+{
+ if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
+ return;
+
+ /*
+ * Reset link information.
+ * Both the currently active vgc level as well as
+ * the link tuner counter should be reset. Resetting
+ * the counter is important for devices where the
+ * device should only perform link tuning during the
+ * first minute after being enabled.
+ */
+ rt2x00dev->link.count = 0;
+ rt2x00dev->link.vgc_level = 0;
+
+ /*
+ * Reset the link tuner.
+ */
+ rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
+
+ if (antenna)
+ rt2x00link_antenna_reset(rt2x00dev);
+}
+
+static void rt2x00link_tuner(struct work_struct *work)
+{
+ struct rt2x00_dev *rt2x00dev =
+ container_of(work, struct rt2x00_dev, link.work.work);
+ struct link_qual *qual = &rt2x00dev->link.qual;
+
+ /*
+ * When the radio is shutting down we should
+ * immediately cease all link tuning.
+ */
+ if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
+ return;
+
+ /*
+ * Update statistics.
+ */
+ rt2x00dev->ops->lib->link_stats(rt2x00dev, qual);
+ rt2x00dev->low_level_stats.dot11FCSErrorCount += qual->rx_failed;
+
+ /*
+ * Only perform the link tuning when Link tuning
+ * has been enabled (This could have been disabled from the EEPROM).
+ */
+ if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
+ rt2x00dev->ops->lib->link_tuner(rt2x00dev);
+
+ /*
+ * Precalculate a portion of the link signal which is
+ * in based on the tx/rx success/failure counters.
+ */
+ rt2x00link_precalculate_signal(rt2x00dev);
+
+ /*
+ * Send a signal to the led to update the led signal strength.
+ */
+ rt2x00leds_led_quality(rt2x00dev, qual->avg_rssi);
+
+ /*
+ * Evaluate antenna setup, make this the last step since this could
+ * possibly reset some statistics.
+ */
+ rt2x00lib_antenna_diversity(rt2x00dev);
+
+ /*
+ * Increase tuner counter, and reschedule the next link tuner run.
+ */
+ rt2x00dev->link.count++;
+ queue_delayed_work(rt2x00dev->hw->workqueue,
+ &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
+}
+
+void rt2x00link_register(struct rt2x00_dev *rt2x00dev)
+{
+ INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00link_tuner);
+}