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// 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");
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