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/*
 * LED driver for the RouterBOARD 750
 *
 * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
 *
 * 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.
 *
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/slab.h>

#include <asm/mach-ath79/mach-rb750.h>

#define DRV_NAME        "leds-rb750"

struct rb750_led_dev {
        struct led_classdev     cdev;
        u32                     mask;
        int                     active_low;
        void                    (*latch_change)(u32 clear, u32 set);
};

struct rb750_led_drvdata {
        struct rb750_led_dev    *led_devs;
        int                     num_leds;
};

static inline struct rb750_led_dev *to_rbled(struct led_classdev *led_cdev)
{
        return (struct rb750_led_dev *)container_of(led_cdev,
                struct rb750_led_dev, cdev);
}

static void rb750_led_brightness_set(struct led_classdev *led_cdev,
                                     enum led_brightness value)
{
        struct rb750_led_dev *rbled = to_rbled(led_cdev);
        int level;

        level = (value == LED_OFF) ? 0 : 1;
        level ^= rbled->active_low;

        if (level)
                rbled->latch_change(0, rbled->mask);
        else
                rbled->latch_change(rbled->mask, 0);
}

static int rb750_led_probe(struct platform_device *pdev)
{
        struct rb750_led_platform_data *pdata;
        struct rb750_led_drvdata *drvdata;
        int ret = 0;
        int i;

        pdata = pdev->dev.platform_data;
        if (!pdata)
                return -EINVAL;

        drvdata = kzalloc(sizeof(struct rb750_led_drvdata) +
                          sizeof(struct rb750_led_dev) * pdata->num_leds,
                          GFP_KERNEL);
        if (!drvdata)
                return -ENOMEM;

        drvdata->num_leds = pdata->num_leds;
        drvdata->led_devs = (struct rb750_led_dev *) &drvdata[1];

        for (i = 0; i < drvdata->num_leds; i++) {
                struct rb750_led_dev *rbled = &drvdata->led_devs[i];
                struct rb750_led_data *led_data = &pdata->leds[i];

                rbled->cdev.name = led_data->name;
                rbled->cdev.default_trigger = led_data->default_trigger;
                rbled->cdev.brightness_set = rb750_led_brightness_set;
                rbled->cdev.brightness = LED_OFF;

                rbled->mask = led_data->mask;
                rbled->active_low = !!led_data->active_low;
                rbled->latch_change = pdata->latch_change;

                ret = led_classdev_register(&pdev->dev, &rbled->cdev);
                if (ret)
                        goto err;
        }

        platform_set_drvdata(pdev, drvdata);
        return 0;

err:
        for (i = i - 1; i >= 0; i--)
                led_classdev_unregister(&drvdata->led_devs[i].cdev);

        kfree(drvdata);
        return ret;
}

static int rb750_led_remove(struct platform_device *pdev)
{
        struct rb750_led_drvdata *drvdata;
        int i;

        drvdata = platform_get_drvdata(pdev);
        for (i = 0; i < drvdata->num_leds; i++)
                led_classdev_unregister(&drvdata->led_devs[i].cdev);

        kfree(drvdata);
        return 0;
}

static struct platform_driver rb750_led_driver = {
        .probe          = rb750_led_probe,
        .remove         = rb750_led_remove,
        .driver         = {
                .name   = DRV_NAME,
                .owner  = THIS_MODULE,
        },
};

MODULE_ALIAS("platform:leds-rb750");

static int __init rb750_led_init(void)
{
        return platform_driver_register(&rb750_led_driver);
}

static void __exit rb750_led_exit(void)
{
        platform_driver_unregister(&rb750_led_driver);
}

module_init(rb750_led_init);
module_exit(rb750_led_exit);

MODULE_DESCRIPTION(DRV_NAME);
MODULE_DESCRIPTION("LED driver for the RouterBOARD 750");
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
MODULE_LICENSE("GPL v2");