ath9k: add TX99 support

TX99 support enables Specific Absorption Rate (SAR) testing.
SAR is the unit of measurement for the amount of radio frequency(RF)
absorbed by the body when using a wireless device. The RF
exposure limits used are expressed in the terms of SAR, which is a
measure of the electric and magnetic field strength and power density
for transmitters operating at frequencies from 300 kHz to 100 GHz.

Regulatory bodies around the world require that wireless device
be evaluated to meet the RF exposure limits set forth in the
governmental SAR regulations.

In the examples below, for more bit rate options see the iw TX bitrate
setting documentation:

http://wireless.kernel.org/en/users/Documentation/iw#Modifying_transmit_bitrates

Example usage:

iw phy phy0 interface add moni0 type monitor
ip link set dev moni0 up

iw dev moni0 set channel 36 HT40+
iw set bitrates mcs-5 4

echo 10 > /sys/kernel/debug/ieee80211/phy0/ath9k/tx99_power
echo 1  > /sys/kernel/debug/ieee80211/phy0/ath9k/tx99

Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/Kconfig b/drivers/net/wireless/ath/ath9k/Kconfig
index 7944c25c9a43..32f139e2e897 100644
--- a/drivers/net/wireless/ath/ath9k/Kconfig
+++ b/drivers/net/wireless/ath/ath9k/Kconfig
@@ -84,6 +84,26 @@ config ATH9K_DFS_CERTIFIED
 	  developed. At this point enabling this option won't do anything
 	  except increase code size.
 
+config ATH9K_TX99
+	bool "Atheros ath9k TX99 testing support"
+	depends on CFG80211_CERTIFICATION_ONUS
+	default n
+	---help---
+	  Say N. This should only be enabled on systems undergoing
+	  certification testing and evaluation in a controlled environment.
+	  Enabling this will only enable TX99 support, all other modes of
+	  operation will be disabled.
+
+	  TX99 support enables Specific Absorption Rate (SAR) testing.
+	  SAR is the unit of measurement for the amount of radio frequency(RF)
+	  absorbed by the body when using a wireless device. The RF exposure
+	  limits used are expressed in the terms of SAR, which is a measure
+	  of the electric and magnetic field strength and power density for
+	  transmitters operating at frequencies from 300 kHz to 100 GHz.
+	  Regulatory bodies around the world require that wireless device
+	  be evaluated to meet the RF exposure limits set forth in the
+	  governmental SAR regulations.
+
 config ATH9K_LEGACY_RATE_CONTROL
 	bool "Atheros ath9k rate control"
 	depends on ATH9K