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>

7 files changed, 494 insertions, 331 deletions

diff --git a/drivers/net/wireless/rt2x00/Makefile b/drivers/net/wireless/rt2x00/Makefile
index 917cb4f3b038..f22d808d8c51 100644
--- a/drivers/net/wireless/rt2x00/Makefile
+++ b/drivers/net/wireless/rt2x00/Makefile
@@ -2,6 +2,7 @@ rt2x00lib-y				+= rt2x00dev.o
 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 39ecf3b82ca1..19c068727a85 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -212,7 +212,7 @@ struct link_qual {
          *                       (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 @@ static inline int rt2x00_get_link_rssi(struct link *link)
         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 e66fb316cd61..2f4cb8de9981 100644
--- a/drivers/net/wireless/rt2x00/rt2x00config.c
+++ b/drivers/net/wireless/rt2x00/rt2x00config.c
@@ -152,8 +152,7 @@ void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
          */
         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 @@ void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
          * 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 54dd10060bf1..cc1940605349 100644
--- a/drivers/net/wireless/rt2x00/rt2x00debug.c
+++ b/drivers/net/wireless/rt2x00/rt2x00debug.c
@@ -130,9 +130,11 @@ struct rt2x00debug_intf {
 };
 
 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 87c0f2c83077..81d7fc8635d3 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 @@ void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
          * 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 @@ void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
         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 @@ void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
         }
 
         /*
-         * 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 @@ int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
          */
         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 @@ int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
         /*
          * 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 86cd26fbf769..fccaffde6f55 100644
--- a/drivers/net/wireless/rt2x00/rt2x00lib.h
+++ b/drivers/net/wireless/rt2x00/rt2x00lib.h
@@ -63,7 +63,6 @@ static inline const struct rt2x00_rate *rt2x00_get_rate(const u16 hw_value)
 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 @@ void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev);
 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_deregister(struct rt2x00_dev *rt2x00dev);
 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_dump_frame(struct rt2x00_dev *rt2x00dev,
 }
 
 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 000000000000..0462d5ab6e97
--- /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);
+}