drivers/net/wireless/iwlwifi/iwl-led.c - kernel/prism - Git at Google

 /******************************************************************************
  *
  * Copyright(c) 2003 - 2009 Intel Corporation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of version 2 of the GNU General Public License as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License along with
  * this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  *
  * The full GNU General Public License is included in this distribution in the
  * file called LICENSE.
  *
  * Contact Information:
  *  Intel Linux Wireless <ilw@linux.intel.com>
  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  *
  *****************************************************************************/


 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/dma-mapping.h>
 #include <linux/delay.h>
 #include <linux/skbuff.h>
 #include <linux/netdevice.h>
 #include <linux/wireless.h>
 #include <net/mac80211.h>
 #include <linux/etherdevice.h>
 #include <asm/unaligned.h>

 #include "iwl-dev.h"
 #include "iwl-core.h"
 #include "iwl-io.h"

 #ifdef CONFIG_IWLWIFI_DEBUG
 static const char *led_type_str[] = {
 	__stringify(IWL_LED_TRG_TX),
 	__stringify(IWL_LED_TRG_RX),
 	__stringify(IWL_LED_TRG_ASSOC),
 	__stringify(IWL_LED_TRG_RADIO),
 	NULL
 };
 #endif /* CONFIG_IWLWIFI_DEBUG */


 static const struct {
 	u16 tpt;	/* Mb/s */
 	u8 on_time;
 	u8 off_time;
 } blink_tbl[] =
 {
 	{300, 25, 25},
 	{200, 40, 40},
 	{100, 55, 55},
 	{70, 65, 65},
 	{50, 75, 75},
 	{20, 85, 85},
 	{15, 95, 95 },
 	{10, 110, 110},
 	{5, 130, 130},
 	{0, 167, 167},
 /* SOLID_ON */
 	{-1, IWL_LED_SOLID, 0}
 };

 #define IWL_1MB_RATE (128 * 1024)
 #define IWL_LED_THRESHOLD (16)
 #define IWL_MAX_BLINK_TBL (ARRAY_SIZE(blink_tbl) - 1) /* exclude SOLID_ON */
 #define IWL_SOLID_BLINK_IDX (ARRAY_SIZE(blink_tbl) - 1)

 /*  [0-256] -> [0..8] FIXME: we need [0..10] */
 static inline int iwl_brightness_to_idx(enum led_brightness brightness)
 {
 	return fls(0x000000FF & (u32)brightness);
 }

 /* Send led command */
 static int iwl_send_led_cmd(struct iwl_priv *priv, struct iwl_led_cmd *led_cmd)
 {
 	struct iwl_host_cmd cmd = {
 		.id = REPLY_LEDS_CMD,
 		.len = sizeof(struct iwl_led_cmd),
 		.data = led_cmd,
 		.flags = CMD_ASYNC,
 		.callback = NULL,
 	};
 	u32 reg;

 	reg = iwl_read32(priv, CSR_LED_REG);
 	if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
 		iwl_write32(priv, CSR_LED_REG, reg & CSR_LED_BSM_CTRL_MSK);

 	return iwl_send_cmd(priv, &cmd);
 }

 /* Set led pattern command */
 static int iwl_led_pattern(struct iwl_priv *priv, int led_id,
 			       unsigned int idx)
 {
 	struct iwl_led_cmd led_cmd = {
 		.id = led_id,
 		.interval = IWL_DEF_LED_INTRVL
 	};

 	BUG_ON(idx > IWL_MAX_BLINK_TBL);

 	led_cmd.on = blink_tbl[idx].on_time;
 	led_cmd.off = blink_tbl[idx].off_time;

 	return iwl_send_led_cmd(priv, &led_cmd);
 }

 /* Set led register off */
 static int iwl_led_on_reg(struct iwl_priv *priv, int led_id)
 {
 	IWL_DEBUG_LED(priv, "led on %d\n", led_id);
 	iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_ON);
 	return 0;
 }

 #if 0
 /* Set led on command */
 static int iwl_led_on(struct iwl_priv *priv, int led_id)
 {
 	struct iwl_led_cmd led_cmd = {
 		.id = led_id,
 		.on = IWL_LED_SOLID,
 		.off = 0,
 		.interval = IWL_DEF_LED_INTRVL
 	};
 	return iwl_send_led_cmd(priv, &led_cmd);
 }

 /* Set led off command */
 int iwl_led_off(struct iwl_priv *priv, int led_id)
 {
 	struct iwl_led_cmd led_cmd = {
 		.id = led_id,
 		.on = 0,
 		.off = 0,
 		.interval = IWL_DEF_LED_INTRVL
 	};
 	IWL_DEBUG_LED(priv, "led off %d\n", led_id);
 	return iwl_send_led_cmd(priv, &led_cmd);
 }
 #endif


 /* Set led register off */
 static int iwl_led_off_reg(struct iwl_priv *priv, int led_id)
 {
 	IWL_DEBUG_LED(priv, "LED Reg off\n");
 	iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_OFF);
 	return 0;
 }

 /*
  * Set led register in case of disassociation according to rfkill state
  */
 static int iwl_led_associate(struct iwl_priv *priv, int led_id)
 {
 	IWL_DEBUG_LED(priv, "Associated\n");
 	priv->allow_blinking = 1;
 	return iwl_led_on_reg(priv, led_id);
 }
 static int iwl_led_disassociate(struct iwl_priv *priv, int led_id)
 {
 	priv->allow_blinking = 0;

 	return 0;
 }

 /*
  * brightness call back function for Tx/Rx LED
  */
 static int iwl_led_associated(struct iwl_priv *priv, int led_id)
 {
 	if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
 	    !test_bit(STATUS_READY, &priv->status))
 		return 0;


 	/* start counting Tx/Rx bytes */
 	if (!priv->last_blink_time && priv->allow_blinking)
 		priv->last_blink_time = jiffies;
 	return 0;
 }

 /*
  * brightness call back for association and radio
  */
 static void iwl_led_brightness_set(struct led_classdev *led_cdev,
 				       enum led_brightness brightness)
 {
 	struct iwl_led *led = container_of(led_cdev, struct iwl_led, led_dev);
 	struct iwl_priv *priv = led->priv;

 	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 		return;


 	IWL_DEBUG_LED(priv, "Led type = %s brightness = %d\n",
 			led_type_str[led->type], brightness);
 	switch (brightness) {
 	case LED_FULL:
 		if (led->led_on)
 			led->led_on(priv, IWL_LED_LINK);
 		break;
 	case LED_OFF:
 		if (led->led_off)
 			led->led_off(priv, IWL_LED_LINK);
 		break;
 	default:
 		if (led->led_pattern) {
 			int idx = iwl_brightness_to_idx(brightness);
 			led->led_pattern(priv, IWL_LED_LINK, idx);
 		}
 		break;
 	}
 }


 /*
  * Register led class with the system
  */
 static int iwl_leds_register_led(struct iwl_priv *priv, struct iwl_led *led,
 				   enum led_type type, u8 set_led,
 				   char *trigger)
 {
 	struct device *device = wiphy_dev(priv->hw->wiphy);
 	int ret;

 	led->led_dev.name = led->name;
 	led->led_dev.brightness_set = iwl_led_brightness_set;
 	led->led_dev.default_trigger = trigger;

 	led->priv = priv;
 	led->type = type;

 	ret = led_classdev_register(device, &led->led_dev);
 	if (ret) {
 		IWL_ERR(priv, "Error: failed to register led handler.\n");
 		return ret;
 	}

 	led->registered = 1;

 	if (set_led && led->led_on)
 		led->led_on(priv, IWL_LED_LINK);

 	return 0;
 }


 /*
  * calculate blink rate according to last second Tx/Rx activities
  */
 static int iwl_get_blink_rate(struct iwl_priv *priv)
 {
 	int i;
 	/* count both tx and rx traffic to be able to
 	 * handle traffic in either direction
 	 */
 	u64 current_tpt = priv->tx_stats.data_bytes +
 			  priv->rx_stats.data_bytes;
 	s64 tpt = current_tpt - priv->led_tpt;

 	if (tpt < 0) /* wraparound */
 		tpt = -tpt;

 	IWL_DEBUG_LED(priv, "tpt %lld current_tpt %llu\n",
 		(long long)tpt,
 		(unsigned long long)current_tpt);
 	priv->led_tpt = current_tpt;

 	if (!priv->allow_blinking)
 		i = IWL_MAX_BLINK_TBL;
 	else
 		for (i = 0; i < IWL_MAX_BLINK_TBL; i++)
 			if (tpt  > (blink_tbl[i].tpt * IWL_1MB_RATE))
 				break;

 	IWL_DEBUG_LED(priv, "LED BLINK IDX=%d\n", i);
 	return i;
 }

 /*
  * this function called from handler. Since setting Led command can
  * happen very frequent we postpone led command to be called from
  * REPLY handler so we know ucode is up
  */
 void iwl_leds_background(struct iwl_priv *priv)
 {
 	u8 blink_idx;

 	if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 		priv->last_blink_time = 0;
 		return;
 	}
 	if (iwl_is_rfkill(priv)) {
 		priv->last_blink_time = 0;
 		return;
 	}

 	if (!priv->allow_blinking) {
 		priv->last_blink_time = 0;
 		if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
 			priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
 			iwl_led_pattern(priv, IWL_LED_LINK,
 					    IWL_SOLID_BLINK_IDX);
 		}
 		return;
 	}
 	if (!priv->last_blink_time ||
 	    !time_after(jiffies, priv->last_blink_time +
 			msecs_to_jiffies(1000)))
 		return;

 	blink_idx = iwl_get_blink_rate(priv);

 	/* call only if blink rate change */
 	if (blink_idx != priv->last_blink_rate)
 		iwl_led_pattern(priv, IWL_LED_LINK, blink_idx);

 	priv->last_blink_time = jiffies;
 	priv->last_blink_rate = blink_idx;
 }

 /* Register all led handler */
 int iwl_leds_register(struct iwl_priv *priv)
 {
 	char *trigger;
 	int ret;

 	priv->last_blink_rate = 0;
 	priv->led_tpt = 0;
 	priv->last_blink_time = 0;
 	priv->allow_blinking = 0;

 	trigger = ieee80211_get_radio_led_name(priv->hw);
 	snprintf(priv->led[IWL_LED_TRG_RADIO].name,
 		 sizeof(priv->led[IWL_LED_TRG_RADIO].name), "iwl-%s::radio",
 		 wiphy_name(priv->hw->wiphy));

 	priv->led[IWL_LED_TRG_RADIO].led_on = iwl_led_on_reg;
 	priv->led[IWL_LED_TRG_RADIO].led_off = iwl_led_off_reg;
 	priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;

 	ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_RADIO],
 				   IWL_LED_TRG_RADIO, 1, trigger);
 	if (ret)
 		goto exit_fail;

 	trigger = ieee80211_get_assoc_led_name(priv->hw);
 	snprintf(priv->led[IWL_LED_TRG_ASSOC].name,
 		 sizeof(priv->led[IWL_LED_TRG_ASSOC].name), "iwl-%s::assoc",
 		 wiphy_name(priv->hw->wiphy));

 	ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_ASSOC],
 				   IWL_LED_TRG_ASSOC, 0, trigger);

 	/* for assoc always turn led on */
 	priv->led[IWL_LED_TRG_ASSOC].led_on = iwl_led_associate;
 	priv->led[IWL_LED_TRG_ASSOC].led_off = iwl_led_disassociate;
 	priv->led[IWL_LED_TRG_ASSOC].led_pattern = NULL;

 	if (ret)
 		goto exit_fail;

 	trigger = ieee80211_get_rx_led_name(priv->hw);
 	snprintf(priv->led[IWL_LED_TRG_RX].name,
 		 sizeof(priv->led[IWL_LED_TRG_RX].name), "iwl-%s::RX",
 		 wiphy_name(priv->hw->wiphy));

 	ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_RX],
 				   IWL_LED_TRG_RX, 0, trigger);

 	priv->led[IWL_LED_TRG_RX].led_on = iwl_led_associated;
 	priv->led[IWL_LED_TRG_RX].led_off = iwl_led_associated;
 	priv->led[IWL_LED_TRG_RX].led_pattern = iwl_led_pattern;

 	if (ret)
 		goto exit_fail;

 	trigger = ieee80211_get_tx_led_name(priv->hw);
 	snprintf(priv->led[IWL_LED_TRG_TX].name,
 		 sizeof(priv->led[IWL_LED_TRG_TX].name), "iwl-%s::TX",
 		 wiphy_name(priv->hw->wiphy));

 	ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_TX],
 				   IWL_LED_TRG_TX, 0, trigger);

 	priv->led[IWL_LED_TRG_TX].led_on = iwl_led_associated;
 	priv->led[IWL_LED_TRG_TX].led_off = iwl_led_associated;
 	priv->led[IWL_LED_TRG_TX].led_pattern = iwl_led_pattern;

 	if (ret)
 		goto exit_fail;

 	return 0;

 exit_fail:
 	iwl_leds_unregister(priv);
 	return ret;
 }
 EXPORT_SYMBOL(iwl_leds_register);

 /* unregister led class */
 static void iwl_leds_unregister_led(struct iwl_led *led, u8 set_led)
 {
 	if (!led->registered)
 		return;

 	led_classdev_unregister(&led->led_dev);

 	if (set_led)
 		led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 	led->registered = 0;
 }

 /* Unregister all led handlers */
 void iwl_leds_unregister(struct iwl_priv *priv)
 {
 	iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_ASSOC], 0);
 	iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RX], 0);
 	iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_TX], 0);
 	iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RADIO], 1);
 }
 EXPORT_SYMBOL(iwl_leds_unregister);
	/******************************************************************************
	*
	* Copyright(c) 2003 - 2009 Intel Corporation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of version 2 of the GNU General Public License as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* You should have received a copy of the GNU General Public License along with
	* this program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
	*
	* The full GNU General Public License is included in this distribution in the
	* file called LICENSE.
	*
	* Contact Information:
	* Intel Linux Wireless <ilw@linux.intel.com>
	* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
	*
	*****************************************************************************/


	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/pci.h>
	#include <linux/dma-mapping.h>
	#include <linux/delay.h>
	#include <linux/skbuff.h>
	#include <linux/netdevice.h>
	#include <linux/wireless.h>
	#include <net/mac80211.h>
	#include <linux/etherdevice.h>
	#include <asm/unaligned.h>

	#include "iwl-dev.h"
	#include "iwl-core.h"
	#include "iwl-io.h"

	#ifdef CONFIG_IWLWIFI_DEBUG
	static const char *led_type_str[] = {
	__stringify(IWL_LED_TRG_TX),
	__stringify(IWL_LED_TRG_RX),
	__stringify(IWL_LED_TRG_ASSOC),
	__stringify(IWL_LED_TRG_RADIO),
	NULL
	};
	#endif /* CONFIG_IWLWIFI_DEBUG */


	static const struct {
	u16 tpt; /* Mb/s */
	u8 on_time;
	u8 off_time;
	} blink_tbl[] =
	{
	{300, 25, 25},
	{200, 40, 40},
	{100, 55, 55},
	{70, 65, 65},
	{50, 75, 75},
	{20, 85, 85},
	{15, 95, 95 },
	{10, 110, 110},
	{5, 130, 130},
	{0, 167, 167},
	/* SOLID_ON */
	{-1, IWL_LED_SOLID, 0}
	};

	#define IWL_1MB_RATE (128 * 1024)
	#define IWL_LED_THRESHOLD (16)
	#define IWL_MAX_BLINK_TBL (ARRAY_SIZE(blink_tbl) - 1) /* exclude SOLID_ON */
	#define IWL_SOLID_BLINK_IDX (ARRAY_SIZE(blink_tbl) - 1)

	/* [0-256] -> [0..8] FIXME: we need [0..10] */
	static inline int iwl_brightness_to_idx(enum led_brightness brightness)
	{
	return fls(0x000000FF & (u32)brightness);
	}

	/* Send led command */
	static int iwl_send_led_cmd(struct iwl_priv priv, struct iwl_led_cmd led_cmd)
	{
	struct iwl_host_cmd cmd = {
	.id = REPLY_LEDS_CMD,
	.len = sizeof(struct iwl_led_cmd),
	.data = led_cmd,
	.flags = CMD_ASYNC,
	.callback = NULL,
	};
	u32 reg;

	reg = iwl_read32(priv, CSR_LED_REG);
	if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
	iwl_write32(priv, CSR_LED_REG, reg & CSR_LED_BSM_CTRL_MSK);

	return iwl_send_cmd(priv, &cmd);
	}

	/* Set led pattern command */
	static int iwl_led_pattern(struct iwl_priv *priv, int led_id,
	unsigned int idx)
	{
	struct iwl_led_cmd led_cmd = {
	.id = led_id,
	.interval = IWL_DEF_LED_INTRVL
	};

	BUG_ON(idx > IWL_MAX_BLINK_TBL);

	led_cmd.on = blink_tbl[idx].on_time;
	led_cmd.off = blink_tbl[idx].off_time;

	return iwl_send_led_cmd(priv, &led_cmd);
	}

	/* Set led register off */
	static int iwl_led_on_reg(struct iwl_priv *priv, int led_id)
	{
	IWL_DEBUG_LED(priv, "led on %d\n", led_id);
	iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_ON);
	return 0;
	}

	#if 0
	/* Set led on command */
	static int iwl_led_on(struct iwl_priv *priv, int led_id)
	{
	struct iwl_led_cmd led_cmd = {
	.id = led_id,
	.on = IWL_LED_SOLID,
	.off = 0,
	.interval = IWL_DEF_LED_INTRVL
	};
	return iwl_send_led_cmd(priv, &led_cmd);
	}

	/* Set led off command */
	int iwl_led_off(struct iwl_priv *priv, int led_id)
	{
	struct iwl_led_cmd led_cmd = {
	.id = led_id,
	.on = 0,
	.off = 0,
	.interval = IWL_DEF_LED_INTRVL
	};
	IWL_DEBUG_LED(priv, "led off %d\n", led_id);
	return iwl_send_led_cmd(priv, &led_cmd);
	}
	#endif


	/* Set led register off */
	static int iwl_led_off_reg(struct iwl_priv *priv, int led_id)
	{
	IWL_DEBUG_LED(priv, "LED Reg off\n");
	iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_OFF);
	return 0;
	}

	/*
	* Set led register in case of disassociation according to rfkill state
	*/
	static int iwl_led_associate(struct iwl_priv *priv, int led_id)
	{
	IWL_DEBUG_LED(priv, "Associated\n");
	priv->allow_blinking = 1;
	return iwl_led_on_reg(priv, led_id);
	}
	static int iwl_led_disassociate(struct iwl_priv *priv, int led_id)
	{
	priv->allow_blinking = 0;

	return 0;
	}

	/*
	* brightness call back function for Tx/Rx LED
	*/
	static int iwl_led_associated(struct iwl_priv *priv, int led_id)
	{
	if (test_bit(STATUS_EXIT_PENDING, &priv->status) \|\|
	!test_bit(STATUS_READY, &priv->status))
	return 0;


	/* start counting Tx/Rx bytes */
	if (!priv->last_blink_time && priv->allow_blinking)
	priv->last_blink_time = jiffies;
	return 0;
	}

	/*
	* brightness call back for association and radio
	*/
	static void iwl_led_brightness_set(struct led_classdev *led_cdev,
	enum led_brightness brightness)
	{
	struct iwl_led *led = container_of(led_cdev, struct iwl_led, led_dev);
	struct iwl_priv *priv = led->priv;

	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
	return;


	IWL_DEBUG_LED(priv, "Led type = %s brightness = %d\n",
	led_type_str[led->type], brightness);
	switch (brightness) {
	case LED_FULL:
	if (led->led_on)
	led->led_on(priv, IWL_LED_LINK);
	break;
	case LED_OFF:
	if (led->led_off)
	led->led_off(priv, IWL_LED_LINK);
	break;
	default:
	if (led->led_pattern) {
	int idx = iwl_brightness_to_idx(brightness);
	led->led_pattern(priv, IWL_LED_LINK, idx);
	}
	break;
	}
	}



	/*
	* Register led class with the system
	*/
	static int iwl_leds_register_led(struct iwl_priv priv, struct iwl_led led,
	enum led_type type, u8 set_led,
	char *trigger)
	{
	struct device *device = wiphy_dev(priv->hw->wiphy);
	int ret;

	led->led_dev.name = led->name;
	led->led_dev.brightness_set = iwl_led_brightness_set;
	led->led_dev.default_trigger = trigger;

	led->priv = priv;
	led->type = type;

	ret = led_classdev_register(device, &led->led_dev);
	if (ret) {
	IWL_ERR(priv, "Error: failed to register led handler.\n");
	return ret;
	}

	led->registered = 1;

	if (set_led && led->led_on)
	led->led_on(priv, IWL_LED_LINK);

	return 0;
	}


	/*
	* calculate blink rate according to last second Tx/Rx activities
	*/
	static int iwl_get_blink_rate(struct iwl_priv *priv)
	{
	int i;
	/* count both tx and rx traffic to be able to
	* handle traffic in either direction
	*/
	u64 current_tpt = priv->tx_stats.data_bytes +
	priv->rx_stats.data_bytes;
	s64 tpt = current_tpt - priv->led_tpt;

	if (tpt < 0) /* wraparound */
	tpt = -tpt;

	IWL_DEBUG_LED(priv, "tpt %lld current_tpt %llu\n",
	(long long)tpt,
	(unsigned long long)current_tpt);
	priv->led_tpt = current_tpt;

	if (!priv->allow_blinking)
	i = IWL_MAX_BLINK_TBL;
	else
	for (i = 0; i < IWL_MAX_BLINK_TBL; i++)
	if (tpt > (blink_tbl[i].tpt * IWL_1MB_RATE))
	break;

	IWL_DEBUG_LED(priv, "LED BLINK IDX=%d\n", i);
	return i;
	}

	/*
	* this function called from handler. Since setting Led command can
	* happen very frequent we postpone led command to be called from
	* REPLY handler so we know ucode is up
	*/
	void iwl_leds_background(struct iwl_priv *priv)
	{
	u8 blink_idx;

	if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
	priv->last_blink_time = 0;
	return;
	}
	if (iwl_is_rfkill(priv)) {
	priv->last_blink_time = 0;
	return;
	}

	if (!priv->allow_blinking) {
	priv->last_blink_time = 0;
	if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
	priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
	iwl_led_pattern(priv, IWL_LED_LINK,
	IWL_SOLID_BLINK_IDX);
	}
	return;
	}
	if (!priv->last_blink_time \|\|
	!time_after(jiffies, priv->last_blink_time +
	msecs_to_jiffies(1000)))
	return;

	blink_idx = iwl_get_blink_rate(priv);

	/* call only if blink rate change */
	if (blink_idx != priv->last_blink_rate)
	iwl_led_pattern(priv, IWL_LED_LINK, blink_idx);

	priv->last_blink_time = jiffies;
	priv->last_blink_rate = blink_idx;
	}

	/* Register all led handler */
	int iwl_leds_register(struct iwl_priv *priv)
	{
	char *trigger;
	int ret;

	priv->last_blink_rate = 0;
	priv->led_tpt = 0;
	priv->last_blink_time = 0;
	priv->allow_blinking = 0;

	trigger = ieee80211_get_radio_led_name(priv->hw);
	snprintf(priv->led[IWL_LED_TRG_RADIO].name,
	sizeof(priv->led[IWL_LED_TRG_RADIO].name), "iwl-%s::radio",
	wiphy_name(priv->hw->wiphy));

	priv->led[IWL_LED_TRG_RADIO].led_on = iwl_led_on_reg;
	priv->led[IWL_LED_TRG_RADIO].led_off = iwl_led_off_reg;
	priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;

	ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_RADIO],
	IWL_LED_TRG_RADIO, 1, trigger);
	if (ret)
	goto exit_fail;

	trigger = ieee80211_get_assoc_led_name(priv->hw);
	snprintf(priv->led[IWL_LED_TRG_ASSOC].name,
	sizeof(priv->led[IWL_LED_TRG_ASSOC].name), "iwl-%s::assoc",
	wiphy_name(priv->hw->wiphy));

	ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_ASSOC],
	IWL_LED_TRG_ASSOC, 0, trigger);

	/* for assoc always turn led on */
	priv->led[IWL_LED_TRG_ASSOC].led_on = iwl_led_associate;
	priv->led[IWL_LED_TRG_ASSOC].led_off = iwl_led_disassociate;
	priv->led[IWL_LED_TRG_ASSOC].led_pattern = NULL;

	if (ret)
	goto exit_fail;

	trigger = ieee80211_get_rx_led_name(priv->hw);
	snprintf(priv->led[IWL_LED_TRG_RX].name,
	sizeof(priv->led[IWL_LED_TRG_RX].name), "iwl-%s::RX",
	wiphy_name(priv->hw->wiphy));

	ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_RX],
	IWL_LED_TRG_RX, 0, trigger);

	priv->led[IWL_LED_TRG_RX].led_on = iwl_led_associated;
	priv->led[IWL_LED_TRG_RX].led_off = iwl_led_associated;
	priv->led[IWL_LED_TRG_RX].led_pattern = iwl_led_pattern;

	if (ret)
	goto exit_fail;

	trigger = ieee80211_get_tx_led_name(priv->hw);
	snprintf(priv->led[IWL_LED_TRG_TX].name,
	sizeof(priv->led[IWL_LED_TRG_TX].name), "iwl-%s::TX",
	wiphy_name(priv->hw->wiphy));

	ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_TX],
	IWL_LED_TRG_TX, 0, trigger);

	priv->led[IWL_LED_TRG_TX].led_on = iwl_led_associated;
	priv->led[IWL_LED_TRG_TX].led_off = iwl_led_associated;
	priv->led[IWL_LED_TRG_TX].led_pattern = iwl_led_pattern;

	if (ret)
	goto exit_fail;

	return 0;

	exit_fail:
	iwl_leds_unregister(priv);
	return ret;
	}
	EXPORT_SYMBOL(iwl_leds_register);

	/* unregister led class */
	static void iwl_leds_unregister_led(struct iwl_led *led, u8 set_led)
	{
	if (!led->registered)
	return;

	led_classdev_unregister(&led->led_dev);

	if (set_led)
	led->led_dev.brightness_set(&led->led_dev, LED_OFF);
	led->registered = 0;
	}

	/* Unregister all led handlers */
	void iwl_leds_unregister(struct iwl_priv *priv)
	{
	iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_ASSOC], 0);
	iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RX], 0);
	iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_TX], 0);
	iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RADIO], 1);
	}
	EXPORT_SYMBOL(iwl_leds_unregister);