// SPDX-License-Identifier: GPL-2.0-only
/*
 * LEDs driver for Soekris net48xx
 *
 * Copyright (C) 2006 Chris Boot <bootc@bootc.net>
 *
 * Based on leds-ams-delta.c
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/nsc_gpio.h>
#include <linux/scx200_gpio.h>
#include <linux/module.h>

#define DRVNAME "net48xx-led"
#define NET48XX_ERROR_LED_GPIO  20

static struct platform_device *pdev;

static void net48xx_error_led_set(struct led_classdev *led_cdev,
                enum led_brightness value)
{
        scx200_gpio_ops.gpio_set(NET48XX_ERROR_LED_GPIO, value ? 1 : 0);
}

static struct led_classdev net48xx_error_led = {
        .name           = "net48xx::error",
        .brightness_set = net48xx_error_led_set,
        .flags          = LED_CORE_SUSPENDRESUME,
};

static int net48xx_led_probe(struct platform_device *pdev)
{
        return devm_led_classdev_register(&pdev->dev, &net48xx_error_led);
}

static struct platform_driver net48xx_led_driver = {
        .probe          = net48xx_led_probe,
        .driver         = {
                .name           = DRVNAME,
        },
};

static int __init net48xx_led_init(void)
{
        int ret;

        /* small hack, but scx200_gpio doesn't set .dev if the probe fails */
        if (!scx200_gpio_ops.dev) {
                ret = -ENODEV;
                goto out;
        }

        ret = platform_driver_register(&net48xx_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(&net48xx_led_driver);
                goto out;
        }

out:
        return ret;
}

static void __exit net48xx_led_exit(void)
{
        platform_device_unregister(pdev);
        platform_driver_unregister(&net48xx_led_driver);
}

module_init(net48xx_led_init);
module_exit(net48xx_led_exit);

MODULE_AUTHOR("Chris Boot <bootc@bootc.net>");
MODULE_DESCRIPTION("Soekris net48xx LED driver");
MODULE_LICENSE("GPL");