ath5k: Implement mac80211 callback set_coverage_class
The callback sets slot time as specified in IEEE 802.11-2007 section
17.3.8.6 (for 20MHz channels only for now) and raises ACK and CTS
timeouts accordingly. The values are persistent, they are restored after
device reset.
Signed-off-by: Lukas Turek <8an@praha12.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath5k/pcu.c b/drivers/net/wireless/ath/ath5k/pcu.c
index b601ff9..aefe84f 100644
--- a/drivers/net/wireless/ath/ath5k/pcu.c
+++ b/drivers/net/wireless/ath/ath5k/pcu.c
@@ -286,6 +286,42 @@
}
/**
+ * ath5k_hw_get_default_slottime - Get the default slot time for current mode
+ *
+ * @ah: The &struct ath5k_hw
+ */
+unsigned int ath5k_hw_get_default_slottime(struct ath5k_hw *ah)
+{
+ struct ieee80211_channel *channel = ah->ah_current_channel;
+
+ if (channel->hw_value & CHANNEL_TURBO)
+ return 6; /* both turbo modes */
+
+ if (channel->hw_value & CHANNEL_CCK)
+ return 20; /* 802.11b */
+
+ return 9; /* 802.11 a/g */
+}
+
+/**
+ * ath5k_hw_get_default_sifs - Get the default SIFS for current mode
+ *
+ * @ah: The &struct ath5k_hw
+ */
+unsigned int ath5k_hw_get_default_sifs(struct ath5k_hw *ah)
+{
+ struct ieee80211_channel *channel = ah->ah_current_channel;
+
+ if (channel->hw_value & CHANNEL_TURBO)
+ return 8; /* both turbo modes */
+
+ if (channel->hw_value & CHANNEL_5GHZ)
+ return 16; /* 802.11a */
+
+ return 10; /* 802.11 b/g */
+}
+
+/**
* ath5k_hw_set_lladdr - Set station id
*
* @ah: The &struct ath5k_hw
@@ -1094,3 +1130,24 @@
return 0;
}
+/**
+ * ath5k_hw_set_coverage_class - Set IEEE 802.11 coverage class
+ *
+ * @ah: The &struct ath5k_hw
+ * @coverage_class: IEEE 802.11 coverage class number
+ *
+ * Sets slot time, ACK timeout and CTS timeout for given coverage class.
+ */
+void ath5k_hw_set_coverage_class(struct ath5k_hw *ah, u8 coverage_class)
+{
+ /* As defined by IEEE 802.11-2007 17.3.8.6 */
+ int slot_time = ath5k_hw_get_default_slottime(ah) + 3 * coverage_class;
+ int ack_timeout = ath5k_hw_get_default_sifs(ah) + slot_time;
+ int cts_timeout = ack_timeout;
+
+ ath5k_hw_set_slot_time(ah, slot_time);
+ ath5k_hw_set_ack_timeout(ah, ack_timeout);
+ ath5k_hw_set_cts_timeout(ah, cts_timeout);
+
+ ah->ah_coverage_class = coverage_class;
+}