ubuntu-linux-kernel/drivers/net/wireless/ralink/rt2x00/rt2x00leds.c

/*
	Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
	<http://rt2x00.serialmonkey.com>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	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, see <http://www.gnu.org/licenses/>.
 */

/*
	Module: rt2x00lib
	Abstract: rt2x00 led specific routines.
 */

#include <linux/kernel.h>
#include <linux/module.h>

#include "rt2x00.h"
#include "rt2x00lib.h"

void rt2x00leds_led_quality(struct rt2x00_dev *rt2x00dev, int rssi)
{
	struct rt2x00_led *led = &rt2x00dev->led_qual;
	unsigned int brightness;

	if ((led->type != LED_TYPE_QUALITY) || !(led->flags & LED_REGISTERED))
		return;

	/*
	 * Led handling requires a positive value for the rssi,
	 * to do that correctly we need to add the correction.
	 */
	rssi += rt2x00dev->rssi_offset;

	/*
	 * Get the rssi level, this is used to convert the rssi
	 * to a LED value inside the range LED_OFF - LED_FULL.
	 */
	if (rssi <= 30)
		rssi = 0;
	else if (rssi <= 39)
		rssi = 1;
	else if (rssi <= 49)
		rssi = 2;
	else if (rssi <= 53)
		rssi = 3;
	else if (rssi <= 63)
		rssi = 4;
	else
		rssi = 5;

	/*
	 * Note that we must _not_ send LED_OFF since the driver
	 * is going to calculate the value and might use it in a
	 * division.
	 */
	brightness = ((LED_FULL / 6) * rssi) + 1;
	if (brightness != led->led_dev.brightness) {
		led->led_dev.brightness_set(&led->led_dev, brightness);
		led->led_dev.brightness = brightness;
	}
}

static void rt2x00led_led_simple(struct rt2x00_led *led, bool enabled)
{
	unsigned int brightness = enabled ? LED_FULL : LED_OFF;

	if (!(led->flags & LED_REGISTERED))
		return;

	led->led_dev.brightness_set(&led->led_dev, brightness);
	led->led_dev.brightness = brightness;
}

void rt2x00led_led_activity(struct rt2x00_dev *rt2x00dev, bool enabled)
{
	if (rt2x00dev->led_qual.type == LED_TYPE_ACTIVITY)
		rt2x00led_led_simple(&rt2x00dev->led_qual, enabled);
}

void rt2x00leds_led_assoc(struct rt2x00_dev *rt2x00dev, bool enabled)
{
	if (rt2x00dev->led_assoc.type == LED_TYPE_ASSOC)
		rt2x00led_led_simple(&rt2x00dev->led_assoc, enabled);
}

void rt2x00leds_led_radio(struct rt2x00_dev *rt2x00dev, bool enabled)
{
	if (rt2x00dev->led_radio.type == LED_TYPE_RADIO)
		rt2x00led_led_simple(&rt2x00dev->led_radio, enabled);
}

static int rt2x00leds_register_led(struct rt2x00_dev *rt2x00dev,
				   struct rt2x00_led *led,
				   const char *name)
{
	struct device *device = wiphy_dev(rt2x00dev->hw->wiphy);
	int retval;

	led->led_dev.name = name;
	led->led_dev.brightness = LED_OFF;

	retval = led_classdev_register(device, &led->led_dev);
	if (retval) {
		rt2x00_err(rt2x00dev, "Failed to register led handler\n");
		return retval;
	}

	led->flags |= LED_REGISTERED;

	return 0;
}

void rt2x00leds_register(struct rt2x00_dev *rt2x00dev)
{
	char name[36];
	int retval;
	unsigned long on_period;
	unsigned long off_period;
	const char *phy_name = wiphy_name(rt2x00dev->hw->wiphy);

	if (rt2x00dev->led_radio.flags & LED_INITIALIZED) {
		snprintf(name, sizeof(name), "%s-%s::radio",
			 rt2x00dev->ops->name, phy_name);

		retval = rt2x00leds_register_led(rt2x00dev,
						 &rt2x00dev->led_radio,
						 name);
		if (retval)
			goto exit_fail;
	}

	if (rt2x00dev->led_assoc.flags & LED_INITIALIZED) {
		snprintf(name, sizeof(name), "%s-%s::assoc",
			 rt2x00dev->ops->name, phy_name);

		retval = rt2x00leds_register_led(rt2x00dev,
						 &rt2x00dev->led_assoc,
						 name);
		if (retval)
			goto exit_fail;
	}

	if (rt2x00dev->led_qual.flags & LED_INITIALIZED) {
		snprintf(name, sizeof(name), "%s-%s::quality",
			 rt2x00dev->ops->name, phy_name);

		retval = rt2x00leds_register_led(rt2x00dev,
						 &rt2x00dev->led_qual,
						 name);
		if (retval)
			goto exit_fail;
	}

	/*
	 * Initialize blink time to default value:
	 * On period: 70ms
	 * Off period: 30ms
	 */
	if (rt2x00dev->led_radio.led_dev.blink_set) {
		on_period = 70;
		off_period = 30;
		rt2x00dev->led_radio.led_dev.blink_set(
		    &rt2x00dev->led_radio.led_dev, &on_period, &off_period);
	}

	return;

exit_fail:
	rt2x00leds_unregister(rt2x00dev);
}

static void rt2x00leds_unregister_led(struct rt2x00_led *led)
{
	led_classdev_unregister(&led->led_dev);

	/*
	 * This might look weird, but when we are unregistering while
	 * suspended the led is already off, and since we haven't
	 * fully resumed yet, access to the device might not be
	 * possible yet.
	 */
	if (!(led->led_dev.flags & LED_SUSPENDED))
		led->led_dev.brightness_set(&led->led_dev, LED_OFF);

	led->flags &= ~LED_REGISTERED;
}

void rt2x00leds_unregister(struct rt2x00_dev *rt2x00dev)
{
	if (rt2x00dev->led_qual.flags & LED_REGISTERED)
		rt2x00leds_unregister_led(&rt2x00dev->led_qual);
	if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
		rt2x00leds_unregister_led(&rt2x00dev->led_assoc);
	if (rt2x00dev->led_radio.flags & LED_REGISTERED)
		rt2x00leds_unregister_led(&rt2x00dev->led_radio);
}

static inline void rt2x00leds_suspend_led(struct rt2x00_led *led)
{
	led_classdev_suspend(&led->led_dev);

	/* This shouldn't be needed, but just to be safe */
	led->led_dev.brightness_set(&led->led_dev, LED_OFF);
	led->led_dev.brightness = LED_OFF;
}

void rt2x00leds_suspend(struct rt2x00_dev *rt2x00dev)
{
	if (rt2x00dev->led_qual.flags & LED_REGISTERED)
		rt2x00leds_suspend_led(&rt2x00dev->led_qual);
	if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
		rt2x00leds_suspend_led(&rt2x00dev->led_assoc);
	if (rt2x00dev->led_radio.flags & LED_REGISTERED)
		rt2x00leds_suspend_led(&rt2x00dev->led_radio);
}

static inline void rt2x00leds_resume_led(struct rt2x00_led *led)
{
	led_classdev_resume(&led->led_dev);

	/* Device might have enabled the LEDS during resume */
	led->led_dev.brightness_set(&led->led_dev, LED_OFF);
	led->led_dev.brightness = LED_OFF;
}

void rt2x00leds_resume(struct rt2x00_dev *rt2x00dev)
{
	if (rt2x00dev->led_radio.flags & LED_REGISTERED)
		rt2x00leds_resume_led(&rt2x00dev->led_radio);
	if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
		rt2x00leds_resume_led(&rt2x00dev->led_assoc);
	if (rt2x00dev->led_qual.flags & LED_REGISTERED)
		rt2x00leds_resume_led(&rt2x00dev->led_qual);
}