iwlwifi: add LED mode to support different LED behavior

Today's implementation allow LED to blink based on the traffic
condition. We introduce an additional LED mode that reflects the RF
state.

The supported LED modes after this are:
  IWL_LED_BLINK (current/default) - blink rate based on current Tx/Rx
                                    traffic
  IWL_LED_RF_STATE (new) -
    LED OFF: No power/RF disabled, the LED is emitting no light
    LED ON:  Powered/RF enabled, the LED is emitting light
             in a stable non-flashing state.

In order to provide the flexibility to support different LED
behavior per user/system preference we add "led_mode" iwlcore module
parameter.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 20 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-led.c b/drivers/net/wireless/iwlwifi/iwl-led.c
index f547233c5b79..685ba9d6f082 100644
--- a/drivers/net/wireless/iwlwifi/iwl-led.c
+++ b/drivers/net/wireless/iwlwifi/iwl-led.c
@@ -42,6 +42,12 @@
 #include "iwl-core.h"
 #include "iwl-io.h"
 
+/* default: IWL_LED_BLINK(0) using blinking index table */
+static int led_mode;
+module_param(led_mode, int, S_IRUGO);
+MODULE_PARM_DESC(led_mode, "led mode: 0=blinking, 1=On(RF On)/Off(RF Off), "
+                           "(default 0)\n");
+
 #ifdef CONFIG_IWLWIFI_DEBUG
 static const char *led_type_str[] = {
         __stringify(IWL_LED_TRG_TX),
@@ -199,7 +205,8 @@ static int iwl_led_off_reg(struct iwl_priv *priv, int led_id)
 static int iwl_led_associate(struct iwl_priv *priv, int led_id)
 {
         IWL_DEBUG_LED(priv, "Associated\n");
-        priv->allow_blinking = 1;
+        if (led_mode == IWL_LED_BLINK)
+                priv->allow_blinking = 1;
         return iwl_led_on_reg(priv, led_id);
 }
 static int iwl_led_disassociate(struct iwl_priv *priv, int led_id)
diff --git a/drivers/net/wireless/iwlwifi/iwl-led.h b/drivers/net/wireless/iwlwifi/iwl-led.h
index ef9b174c37ff..dd76b266c633 100644
--- a/drivers/net/wireless/iwlwifi/iwl-led.h
+++ b/drivers/net/wireless/iwlwifi/iwl-led.h
@@ -47,6 +47,18 @@ enum led_type {
         IWL_LED_TRG_RADIO,
         IWL_LED_TRG_MAX,
 };
+
+/*
+ * LED mode
+ *    IWL_LED_BLINK:    adjust led blink rate based on blink table
+ *    IWL_LED_RF_STATE: turn LED on/off based on RF state
+ *                      LED ON  = RF ON
+ *                      LED OFF = RF OFF
+ */
+enum iwl_led_mode {
+        IWL_LED_BLINK,
+        IWL_LED_RF_STATE,
+};
 #endif
 
 #ifdef CONFIG_IWLWIFI_LEDS