iwlwifi: add debugfs to disable/enable run time calibration

This patch adds functionality to debugfs to enable or disable chain
noise or sensitivity calibrations.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-calib.c b/drivers/net/wireless/iwlwifi/iwl-calib.c
index 1289d4c..beb9716 100644
--- a/drivers/net/wireless/iwlwifi/iwl-calib.c
+++ b/drivers/net/wireless/iwlwifi/iwl-calib.c
@@ -426,6 +426,9 @@
 	struct iwl_sensitivity_data *data = NULL;
 	const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 
+	if (priv->disable_sens_cal)
+		return;
+
 	IWL_DEBUG_CALIB("Start iwl_init_sensitivity\n");
 
 	/* Clear driver's sensitivity algo data */
@@ -486,6 +489,9 @@
 	unsigned long flags;
 	struct statistics_general_data statis;
 
+	if (priv->disable_sens_cal)
+		return;
+
 	data = &(priv->sensitivity_data);
 
 	if (!iwl_is_associated(priv)) {
@@ -608,6 +614,9 @@
 	unsigned long flags;
 	struct statistics_rx_non_phy *rx_info = &(stat_resp->rx.general);
 
+	if (priv->disable_chain_noise_cal)
+		return;
+
 	data = &(priv->chain_noise_data);
 
 	/* Accumulate just the first 20 beacons after the first association,