drivers/net/wireless/iwlwifi/mvm/led.c

/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2012 - 2014 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 COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
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 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 *****************************************************************************/

#include <linux/leds.h>
#include "iwl-io.h"
#include "iwl-csr.h"
#include "mvm.h"

/* Set led register on */
static void iwl_mvm_led_enable(struct iwl_mvm *mvm)
{
	iwl_write32(mvm->trans, CSR_LED_REG, CSR_LED_REG_TURN_ON);
}

/* Set led register off */
static void iwl_mvm_led_disable(struct iwl_mvm *mvm)
{
	iwl_write32(mvm->trans, CSR_LED_REG, CSR_LED_REG_TURN_OFF);
}

static void iwl_led_brightness_set(struct led_classdev *led_cdev,
				   enum led_brightness brightness)
{
	struct iwl_mvm *mvm = container_of(led_cdev, struct iwl_mvm, led);
	if (brightness > 0)
		iwl_mvm_led_enable(mvm);
	else
		iwl_mvm_led_disable(mvm);
}

int iwl_mvm_leds_init(struct iwl_mvm *mvm)
{
	int mode = iwlwifi_mod_params.led_mode;
	int ret;

	switch (mode) {
	case IWL_LED_DEFAULT:
	case IWL_LED_RF_STATE:
		mode = IWL_LED_RF_STATE;
		break;
	case IWL_LED_DISABLE:
		IWL_INFO(mvm, "Led disabled\n");
		return 0;
	default:
		return -EINVAL;
	}

	mvm->led.name = kasprintf(GFP_KERNEL, "%s-led",
				   wiphy_name(mvm->hw->wiphy));
	mvm->led.brightness_set = iwl_led_brightness_set;
	mvm->led.max_brightness = 1;

	if (mode == IWL_LED_RF_STATE)
		mvm->led.default_trigger =
			ieee80211_get_radio_led_name(mvm->hw);

	ret = led_classdev_register(mvm->trans->dev, &mvm->led);
	if (ret) {
		kfree(mvm->led.name);
		IWL_INFO(mvm, "Failed to enable led\n");
		return ret;
	}

	return 0;
}

void iwl_mvm_leds_exit(struct iwl_mvm *mvm)
{
	if (iwlwifi_mod_params.led_mode == IWL_LED_DISABLE)
		return;

	led_classdev_unregister(&mvm->led);
	kfree(mvm->led.name);
}