leds-sead3.c

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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2012 MIPS Technologies, Inc.  All rights reserved.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/err.h>
#include <linux/io.h>

#define DRVNAME "sead3-led"

static struct platform_device *pdev;

static void sead3_pled_set(struct led_classdev *led_cdev,
        enum led_brightness value)
{
    pr_debug("sead3_pled_set\n");
    writel(value, (void __iomem *)0xBF000210);  /* FIXME */
}

static void sead3_fled_set(struct led_classdev *led_cdev,
        enum led_brightness value)
{
    pr_debug("sead3_fled_set\n");
    writel(value, (void __iomem *)0xBF000218);  /* FIXME */
}

static struct led_classdev sead3_pled = {
    .name       = "sead3::pled",
    .brightness_set = sead3_pled_set,
};

static struct led_classdev sead3_fled = {
    .name       = "sead3::fled",
    .brightness_set = sead3_fled_set,
};

#ifdef CONFIG_PM
static int sead3_led_suspend(struct platform_device *dev,
        pm_message_t state)
{
    led_classdev_suspend(&sead3_pled);
    led_classdev_suspend(&sead3_fled);
    return 0;
}

static int sead3_led_resume(struct platform_device *dev)
{
    led_classdev_resume(&sead3_pled);
    led_classdev_resume(&sead3_fled);
    return 0;
}
#else
#define sead3_led_suspend NULL
#define sead3_led_resume NULL
#endif

static int sead3_led_probe(struct platform_device *pdev)
{
    int ret;

    ret = led_classdev_register(&pdev->dev, &sead3_pled);
    if (ret < 0)
        return ret;

    ret = led_classdev_register(&pdev->dev, &sead3_fled);
    if (ret < 0)
        led_classdev_unregister(&sead3_pled);

    return ret;
}

static int sead3_led_remove(struct platform_device *pdev)
{
    led_classdev_unregister(&sead3_pled);
    led_classdev_unregister(&sead3_fled);
    return 0;
}

static struct platform_driver sead3_led_driver = {
    .probe      = sead3_led_probe,
    .remove     = sead3_led_remove,
    .suspend    = sead3_led_suspend,
    .resume     = sead3_led_resume,
    .driver     = {
        .name       = DRVNAME,
        .owner      = THIS_MODULE,
    },
};

static int __init sead3_led_init(void)
{
    int ret;

    ret = platform_driver_register(&sead3_led_driver);
    if (ret < 0)
        goto out;

    pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
    if (IS_ERR(pdev)) {
        ret = PTR_ERR(pdev);
        platform_driver_unregister(&sead3_led_driver);
        goto out;
    }

out:
    return ret;
}

static void __exit sead3_led_exit(void)
{
    platform_device_unregister(pdev);
    platform_driver_unregister(&sead3_led_driver);
}

module_init(sead3_led_init);
module_exit(sead3_led_exit);

MODULE_AUTHOR("Kristian Kielhofner <[email protected]>");
MODULE_DESCRIPTION("SEAD3 LED driver");
MODULE_LICENSE("GPL");