/*
        Copyright (C) 2004 - 2009 rt2x00 SourceForge Project
        <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, write to the
        Free Software Foundation, Inc.,
        59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
        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) {
                ERROR(rt2x00dev, "Failed to register led handler.\n");
                return retval;
        }

        led->flags |= LED_REGISTERED;

        return 0;
}

void rt2x00leds_register(struct rt2x00_dev *rt2x00dev)
{
        char dev_name[16];
        char name[32];
        int retval;
        unsigned long on_period;
        unsigned long off_period;

        snprintf(dev_name, sizeof(dev_name), "%s-%s",
                 rt2x00dev->ops->name, wiphy_name(rt2x00dev->hw->wiphy));

        if (rt2x00dev->led_radio.flags & LED_INITIALIZED) {
                snprintf(name, sizeof(name), "%s::radio", dev_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::assoc", dev_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::quality", dev_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);
}