ath: simplify kconfig dependency and add documentation

Make atheros wireless drivers visible when you select
"Atheros wirless drivers". Adds links to ath.ko page,
and Atheros drivers page on the wiki.
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/Kconfig

@@ -2,9 +2,23 @@ config ATH_COMMON
 	tristate "Atheros Wireless Cards"
 	depends on WLAN_80211
 	depends on CFG80211
-	depends on ATH5K || ATH9K || AR9170_USB
+	---help---
+	  This will enable the support for the Atheros wireless drivers.
+	  ath5k, ath9k and ar9170 drivers share some common code, this option
+	  enables the common ath.ko module which currently shares just common
+	  regulatory EEPROM helpers but will likely be extended later to share
+	  more between modules.
 
+	  For more information and documentation on this module you can visit:
+
+	  http://wireless.kernel.org/en/users/Drivers/ath
+
+	  For information on all Atheros wireless drivers visit:
+
+	  http://wireless.kernel.org/en/users/Drivers/Atheros
+
+if ATH_COMMON
 source "drivers/net/wireless/ath/ath5k/Kconfig"
 source "drivers/net/wireless/ath/ath9k/Kconfig"
 source "drivers/net/wireless/ath/ar9170/Kconfig"
-
+endif

drivers/net/wireless/ath/ar9170/Kconfig

@@ -2,7 +2,6 @@ config AR9170_USB
 	tristate "Atheros AR9170 802.11n USB support"
 	depends on USB && MAC80211 && WLAN_80211 && EXPERIMENTAL
 	select FW_LOADER
-	select ATH_COMMON
 	help
 	  This is a driver for the Atheros "otus" 802.11n USB devices.
 

drivers/net/wireless/ath/ath5k/Kconfig

 config ATH5K
 	tristate "Atheros 5xxx wireless cards support"
 	depends on PCI && MAC80211 && WLAN_80211 && EXPERIMENTAL
-	select ATH_COMMON
 	select MAC80211_LEDS
 	select LEDS_CLASS
 	select NEW_LEDS

drivers/net/wireless/ath/ath9k/Kconfig

 config ATH9K
 	tristate "Atheros 802.11n wireless cards support"
 	depends on PCI && MAC80211 && WLAN_80211
-	select ATH_COMMON
 	select MAC80211_LEDS
 	select LEDS_CLASS
 	select NEW_LEDS