/*
   * Copyright 2006, Johannes Berg <johannes@sipsolutions.net>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  /* just for IFNAMSIZ */
  #include <linux/if.h>
  #include <linux/slab.h>
  #include <linux/export.h>
  #include "led.h"
  
  #define MAC80211_BLINK_DELAY 50 /* ms */
  
  void ieee80211_led_rx(struct ieee80211_local *local)
  {
  	unsigned long led_delay = MAC80211_BLINK_DELAY;
  	if (unlikely(!local->rx_led))
  		return;
  	led_trigger_blink_oneshot(local->rx_led, &led_delay, &led_delay, 0);
  }
  
  void ieee80211_led_tx(struct ieee80211_local *local)
  {
  	unsigned long led_delay = MAC80211_BLINK_DELAY;
  	if (unlikely(!local->tx_led))
  		return;
  	led_trigger_blink_oneshot(local->tx_led, &led_delay, &led_delay, 0);
  }
  
  void ieee80211_led_assoc(struct ieee80211_local *local, bool associated)
  {
  	if (unlikely(!local->assoc_led))
  		return;
  	if (associated)
  		led_trigger_event(local->assoc_led, LED_FULL);
  	else
  		led_trigger_event(local->assoc_led, LED_OFF);
  }
  
  void ieee80211_led_radio(struct ieee80211_local *local, bool enabled)
  {
  	if (unlikely(!local->radio_led))
  		return;
  	if (enabled)
  		led_trigger_event(local->radio_led, LED_FULL);
  	else
  		led_trigger_event(local->radio_led, LED_OFF);
  }
  
  void ieee80211_led_names(struct ieee80211_local *local)
  {
  	snprintf(local->rx_led_name, sizeof(local->rx_led_name),
  		 "%srx", wiphy_name(local->hw.wiphy));
  	snprintf(local->tx_led_name, sizeof(local->tx_led_name),
  		 "%stx", wiphy_name(local->hw.wiphy));
  	snprintf(local->assoc_led_name, sizeof(local->assoc_led_name),
  		 "%sassoc", wiphy_name(local->hw.wiphy));
  	snprintf(local->radio_led_name, sizeof(local->radio_led_name),
  		 "%sradio", wiphy_name(local->hw.wiphy));
  }
  
  void ieee80211_led_init(struct ieee80211_local *local)
  {
  	local->rx_led = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);
  	if (local->rx_led) {
  		local->rx_led->name = local->rx_led_name;
  		if (led_trigger_register(local->rx_led)) {
  			kfree(local->rx_led);
  			local->rx_led = NULL;
  		}
  	}
  
  	local->tx_led = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);
  	if (local->tx_led) {
  		local->tx_led->name = local->tx_led_name;
  		if (led_trigger_register(local->tx_led)) {
  			kfree(local->tx_led);
  			local->tx_led = NULL;
  		}
  	}
  
  	local->assoc_led = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);
  	if (local->assoc_led) {
  		local->assoc_led->name = local->assoc_led_name;
  		if (led_trigger_register(local->assoc_led)) {
  			kfree(local->assoc_led);
  			local->assoc_led = NULL;
  		}
  	}
  
  	local->radio_led = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);
  	if (local->radio_led) {
  		local->radio_led->name = local->radio_led_name;
  		if (led_trigger_register(local->radio_led)) {
  			kfree(local->radio_led);
  			local->radio_led = NULL;
  		}
  	}
  
  	if (local->tpt_led_trigger) {
  		if (led_trigger_register(&local->tpt_led_trigger->trig)) {
  			kfree(local->tpt_led_trigger);
  			local->tpt_led_trigger = NULL;
  		}
  	}
  }
  
  void ieee80211_led_exit(struct ieee80211_local *local)
  {
  	if (local->radio_led) {
  		led_trigger_unregister(local->radio_led);
  		kfree(local->radio_led);
  	}
  	if (local->assoc_led) {
  		led_trigger_unregister(local->assoc_led);
  		kfree(local->assoc_led);
  	}
  	if (local->tx_led) {
  		led_trigger_unregister(local->tx_led);
  		kfree(local->tx_led);
  	}
  	if (local->rx_led) {
  		led_trigger_unregister(local->rx_led);
  		kfree(local->rx_led);
  	}
  
  	if (local->tpt_led_trigger) {
  		led_trigger_unregister(&local->tpt_led_trigger->trig);
  		kfree(local->tpt_led_trigger);
  	}
  }
  
  char *__ieee80211_get_radio_led_name(struct ieee80211_hw *hw)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  
  	return local->radio_led_name;
  }
  EXPORT_SYMBOL(__ieee80211_get_radio_led_name);
  
  char *__ieee80211_get_assoc_led_name(struct ieee80211_hw *hw)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  
  	return local->assoc_led_name;
  }
  EXPORT_SYMBOL(__ieee80211_get_assoc_led_name);
  
  char *__ieee80211_get_tx_led_name(struct ieee80211_hw *hw)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  
  	return local->tx_led_name;
  }
  EXPORT_SYMBOL(__ieee80211_get_tx_led_name);
  
  char *__ieee80211_get_rx_led_name(struct ieee80211_hw *hw)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  
  	return local->rx_led_name;
  }
  EXPORT_SYMBOL(__ieee80211_get_rx_led_name);
  
  static unsigned long tpt_trig_traffic(struct ieee80211_local *local,
  				      struct tpt_led_trigger *tpt_trig)
  {
  	unsigned long traffic, delta;
  
  	traffic = tpt_trig->tx_bytes + tpt_trig->rx_bytes;
  
  	delta = traffic - tpt_trig->prev_traffic;
  	tpt_trig->prev_traffic = traffic;
  	return DIV_ROUND_UP(delta, 1024 / 8);
  }
  
  static void tpt_trig_timer(unsigned long data)
  {
  	struct ieee80211_local *local = (void *)data;
  	struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
  	struct led_classdev *led_cdev;
  	unsigned long on, off, tpt;
  	int i;
  
  	if (!tpt_trig->running)
  		return;
  
  	mod_timer(&tpt_trig->timer, round_jiffies(jiffies + HZ));
  
  	tpt = tpt_trig_traffic(local, tpt_trig);
  
  	/* default to just solid on */
  	on = 1;
  	off = 0;
  
  	for (i = tpt_trig->blink_table_len - 1; i >= 0; i--) {
  		if (tpt_trig->blink_table[i].throughput < 0 ||
  		    tpt > tpt_trig->blink_table[i].throughput) {
  			off = tpt_trig->blink_table[i].blink_time / 2;
  			on = tpt_trig->blink_table[i].blink_time - off;
  			break;
  		}
  	}
  
  	read_lock(&tpt_trig->trig.leddev_list_lock);
  	list_for_each_entry(led_cdev, &tpt_trig->trig.led_cdevs, trig_list)
  		led_blink_set(led_cdev, &on, &off);
  	read_unlock(&tpt_trig->trig.leddev_list_lock);
  }
  
  char *__ieee80211_create_tpt_led_trigger(struct ieee80211_hw *hw,
  				unsigned int flags,
  				const struct ieee80211_tpt_blink *blink_table,
  				unsigned int blink_table_len)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  	struct tpt_led_trigger *tpt_trig;
  
  	if (WARN_ON(local->tpt_led_trigger))
  		return NULL;
  
  	tpt_trig = kzalloc(sizeof(struct tpt_led_trigger), GFP_KERNEL);
  	if (!tpt_trig)
  		return NULL;
  
  	snprintf(tpt_trig->name, sizeof(tpt_trig->name),
  		 "%stpt", wiphy_name(local->hw.wiphy));
  
  	tpt_trig->trig.name = tpt_trig->name;
  
  	tpt_trig->blink_table = blink_table;
  	tpt_trig->blink_table_len = blink_table_len;
  	tpt_trig->want = flags;
  
  	setup_timer(&tpt_trig->timer, tpt_trig_timer, (unsigned long)local);
  
  	local->tpt_led_trigger = tpt_trig;
  
  	return tpt_trig->name;
  }
  EXPORT_SYMBOL(__ieee80211_create_tpt_led_trigger);
  
  static void ieee80211_start_tpt_led_trig(struct ieee80211_local *local)
  {
  	struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
  
  	if (tpt_trig->running)
  		return;
  
  	/* reset traffic */
  	tpt_trig_traffic(local, tpt_trig);
  	tpt_trig->running = true;
  
  	tpt_trig_timer((unsigned long)local);
  	mod_timer(&tpt_trig->timer, round_jiffies(jiffies + HZ));
  }
  
  static void ieee80211_stop_tpt_led_trig(struct ieee80211_local *local)
  {
  	struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
  	struct led_classdev *led_cdev;
  
  	if (!tpt_trig->running)
  		return;
  
  	tpt_trig->running = false;
  	del_timer_sync(&tpt_trig->timer);
  
  	read_lock(&tpt_trig->trig.leddev_list_lock);
  	list_for_each_entry(led_cdev, &tpt_trig->trig.led_cdevs, trig_list)
  		led_set_brightness(led_cdev, LED_OFF);
  	read_unlock(&tpt_trig->trig.leddev_list_lock);
  }
  
  void ieee80211_mod_tpt_led_trig(struct ieee80211_local *local,
  				unsigned int types_on, unsigned int types_off)
  {
  	struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
  	bool allowed;
  
  	WARN_ON(types_on & types_off);
  
  	if (!tpt_trig)
  		return;
  
  	tpt_trig->active &= ~types_off;
  	tpt_trig->active |= types_on;
  
  	/*
  	 * Regardless of wanted state, we shouldn't blink when
  	 * the radio is disabled -- this can happen due to some
  	 * code ordering issues with __ieee80211_recalc_idle()
  	 * being called before the radio is started.
  	 */
  	allowed = tpt_trig->active & IEEE80211_TPT_LEDTRIG_FL_RADIO;
  
  	if (!allowed || !(tpt_trig->active & tpt_trig->want))
  		ieee80211_stop_tpt_led_trig(local);
  	else
  		ieee80211_start_tpt_led_trig(local);
  }