// SPDX-License-Identifier: GPL-2.0
/*
 * LED Driver for SGI Octane machines
 */

#include <asm/io.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/leds.h>

#define IP30_LED_SYSTEM 0
#define IP30_LED_FAULT  1

struct ip30_led {
        struct led_classdev cdev;
        u32 __iomem *reg;
};

static void ip30led_set(struct led_classdev *led_cdev,
                        enum led_brightness value)
{
        struct ip30_led *led = container_of(led_cdev, struct ip30_led, cdev);

        writel(value, led->reg);
}

static int ip30led_create(struct platform_device *pdev, int num)
{
        struct ip30_led *data;

        data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
        if (!data)
                return -ENOMEM;

        data->reg = devm_platform_ioremap_resource(pdev, num);
        if (IS_ERR(data->reg))
                return PTR_ERR(data->reg);

        switch (num) {
        case IP30_LED_SYSTEM:
                data->cdev.name = "white:power";
                break;
        case IP30_LED_FAULT:
                data->cdev.name = "red:fault";
                break;
        default:
                return -EINVAL;
        }

        data->cdev.brightness = readl(data->reg);
        data->cdev.max_brightness = 1;
        data->cdev.brightness_set = ip30led_set;

        return devm_led_classdev_register(&pdev->dev, &data->cdev);
}

static int ip30led_probe(struct platform_device *pdev)
{
        int ret;

        ret = ip30led_create(pdev, IP30_LED_SYSTEM);
        if (ret < 0)
                return ret;

        return ip30led_create(pdev, IP30_LED_FAULT);
}

static struct platform_driver ip30led_driver = {
        .probe          = ip30led_probe,
        .driver         = {
                .name           = "ip30-leds",
        },
};

module_platform_driver(ip30led_driver);

MODULE_AUTHOR("Thomas Bogendoerfer <tbogendoerfer@suse.de>");
MODULE_DESCRIPTION("SGI Octane LED driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ip30-leds");