ath6kl: Bringing in the upstream version

chromeos/drivers/ath6kl/Kconfig

 config ATH6K_LEGACY
-        tristate "Atheros AR600x support (non mac80211)"
-        depends on MMC
-        depends on WLAN_80211
+        tristate "Atheros AR6003 support (non mac80211)"
+        depends on MMC && WLAN
+        select WIRELESS_EXT
+        select WEXT_PRIV
         help
-        This module adds support for wireless adapters based on Atheros AR600x chipset running over SDIO. If you choose to build it as a module, it will be called ath6kl.
+        This module adds support for wireless adapters based on Atheros AR6003 chipset running over SDIO. If you choose to build it as a module, it will be called ath6kl. Pls note that AR6002 and AR6001 are not supported by this driver.
 
 choice
-        prompt "AR600x Board Data Configuration"
+        prompt "AR6003 Board Data Configuration"
         depends on ATH6K_LEGACY
         default AR600x_SD31_XXX
         help
-        Select the appropriate board data template from the list below that matches your AR600x based reference design.
+        Select the appropriate board data template from the list below that matches your AR6003 based reference design.
 
 config AR600x_SD31_XXX
         bool "SD31-xxx"
         help
         Board Data file for a standard SD31 reference design (File: bdata.SD31.bin)
 
 config AR600x_WB31_XXX
         bool "WB31-xxx"
         help
         Board Data file for a standard WB31 (BT/WiFi) reference design (File: bdata.WB31.bin)
@@ skipping 13 matching lines @@
         bool "BT Coexistence support"
         depends on ATH6K_LEGACY
         help
         Enables WLAN/BT coexistence support. Select the apprpriate configuration from below.
 
 choice
         prompt "Front-End Antenna Configuration"
         depends on ATH6KL_ENABLE_COEXISTENCE
         default AR600x_DUAL_ANTENNA
         help
-        Select the appropriate configuration from the list below that matches your AR600x based reference design.
+        Indicates the number of antennas being used by BT and WLAN. Select the appropriate configuration from the list below that matches your AR6003 based reference design.
 
 config AR600x_DUAL_ANTENNA
         bool "Dual Antenna"
         help
         Dual Antenna Design
 
 config AR600x_SINGLE_ANTENNA
         bool "Single Antenna"
         help
         Single Antenna Design
 endchoice
 
 choice
         prompt "Collocated Bluetooth Type"
         depends on ATH6KL_ENABLE_COEXISTENCE
         default AR600x_BT_AR3001
         help
-        Select the appropriate configuration from the list below that matches your AR600x based reference design.
+        Select the appropriate configuration from the list below that matches your AR6003 based reference design.
 
 config AR600x_BT_QCOM
         bool "Qualcomm BTS4020X"
         help
         Qualcomm BT (3 Wire PTA)
 
 config AR600x_BT_CSR
         bool "CSR BC06"
         help
         CSR BT (3 Wire PTA)
@@ skipping 20 matching lines @@
         int "GPIO"
         depends on ATH6KL_CONFIG_GPIO_BT_RESET
         default 22
         help
         WLAN GPIO to be used for resetting BT
 
 config ATH6KL_CFG80211
         bool "CFG80211 support"
         depends on ATH6K_LEGACY
         help
-        Enables support for CFG80211 APIs
+        Enables support for CFG80211 APIs. The default option is to use WEXT. Even with this option enabled, WEXT is not explicitly disabled and the onus of not exercising WEXT lies on the application(s) running in the user space.
 
 config ATH6KL_HTC_RAW_INTERFACE
         bool "RAW HTC support"
         depends on ATH6K_LEGACY
         help
         Enables raw HTC interface. Allows application to directly talk to the HTC interface via the ioctl interface
 
 config ATH6KL_VIRTUAL_SCATTER_GATHER
         bool "Virtual Scatter-Gather support"
         depends on ATH6K_LEGACY
         help
         Enables virtual scatter gather support for the hardware that does not support it natively.
 
 config ATH6KL_SKIP_ABI_VERSION_CHECK
         bool "Skip ABI version check support"
         depends on ATH6K_LEGACY
         help
         Forces the driver to disable ABI version check. Caution: Incompatilbity between the host driver and target firmware may lead to unknown side effects.
 
+config ATH6KL_BT_UART_FC_POLARITY
+        int "UART Flow Control Polarity"
+        depends on ATH6KL_LEGACY
+        default 0
+        help
+        Configures the polarity of UART Flow Control. A value of 0 implies active low and is the default setting. Set it to 1 for active high.
+
 config ATH6KL_DEBUG
         bool "Debug support"
         depends on ATH6K_LEGACY
         help
         Enables debug support
 
 config ATH6KL_ENABLE_HOST_DEBUG
         bool "Host Debug support"
         depends on ATH6KL_DEBUG
         help
@@ skipping 10 matching lines @@
         depends on ATH6KL_ENABLE_TARGET_DEBUG_PRINTS
         default 8
         help
         WLAN GPIO to be used for Debug UART (Tx)
 
 config ATH6KL_DISABLE_TARGET_DBGLOGS
         bool "Target Debug support - Disable Debug logs"
         depends on ATH6KL_DEBUG
         help
         Enables debug logs