iwlagn: Add power_level module parameter

Add power_level module parameter to set the default power save level.
Power save level has range from 1 - 5, default power save level is 1.
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

drivers/net/wireless/iwlwifi/iwl-agn-lib.c

@@ -624,6 +624,7 @@ struct iwl_mod_params iwlagn_mod_params = {
 	.plcp_check = true,
 	.bt_coex_active = true,
 	.no_sleep_autoadjust = true,
+	.power_level = IWL_POWER_INDEX_1,
 	/* the rest are 0 by default */
 };
 

drivers/net/wireless/iwlwifi/iwl-agn.c

@@ -3831,6 +3831,11 @@ module_param_named(power_save, iwlagn_mod_params.power_save,
 MODULE_PARM_DESC(power_save,
 		 "enable WiFi power management (default: disable)");
 
+module_param_named(power_level, iwlagn_mod_params.power_level,
+		int, S_IRUGO);
+MODULE_PARM_DESC(power_level,
+		 "default power save level (range from 1 - 5, default: 1)");
+
 /*
  * For now, keep using power level 1 instead of automatically
  * adjusting ...

drivers/net/wireless/iwlwifi/iwl-core.h

@@ -164,6 +164,7 @@ struct iwl_mod_params {
 	int led_mode;		/* def: 0 = system default */
 	bool no_sleep_autoadjust; /* def: true = disable autoadjust */
 	bool power_save;	/* def: false = disable power save */
+	int power_level;	/* def: 1 = power level */
 };
 
 /*

drivers/net/wireless/iwlwifi/iwl-power.c

@@ -358,9 +358,15 @@ static void iwl_power_build_cmd(struct iwl_priv *priv,
 		iwl_static_sleep_cmd(priv, cmd,
 				     priv->power_data.debug_sleep_level_override,
 				     dtimper);
-	else if (iwlagn_mod_params.no_sleep_autoadjust)
-		iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_1, dtimper);
-	else
+	else if (iwlagn_mod_params.no_sleep_autoadjust) {
+		if (iwlagn_mod_params.power_level > IWL_POWER_INDEX_1 &&
+		    iwlagn_mod_params.power_level <= IWL_POWER_INDEX_5)
+			iwl_static_sleep_cmd(priv, cmd,
+				iwlagn_mod_params.power_level, dtimper);
+		else
+			iwl_static_sleep_cmd(priv, cmd,
+				IWL_POWER_INDEX_1, dtimper);
+	} else
 		iwl_power_fill_sleep_cmd(priv, cmd,
 					 priv->hw->conf.dynamic_ps_timeout,
 					 priv->hw->conf.max_sleep_period);