87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* LED Driver for SGI Octane machines
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/leds.h>
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#define IP30_LED_SYSTEM 0
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#define IP30_LED_FAULT 1
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struct ip30_led {
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struct led_classdev cdev;
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u32 __iomem *reg;
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};
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static void ip30led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct ip30_led *led = container_of(led_cdev, struct ip30_led, cdev);
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writel(value, led->reg);
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}
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static int ip30led_create(struct platform_device *pdev, int num)
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{
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struct resource *res;
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struct ip30_led *data;
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res = platform_get_resource(pdev, IORESOURCE_MEM, num);
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if (!res)
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return -EBUSY;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->reg = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(data->reg))
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return PTR_ERR(data->reg);
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switch (num) {
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case IP30_LED_SYSTEM:
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data->cdev.name = "white:power";
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break;
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case IP30_LED_FAULT:
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data->cdev.name = "red:fault";
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break;
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default:
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return -EINVAL;
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}
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data->cdev.brightness = readl(data->reg);
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data->cdev.max_brightness = 1;
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data->cdev.brightness_set = ip30led_set;
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return devm_led_classdev_register(&pdev->dev, &data->cdev);
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}
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static int ip30led_probe(struct platform_device *pdev)
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{
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int ret;
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ret = ip30led_create(pdev, IP30_LED_SYSTEM);
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if (ret < 0)
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return ret;
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return ip30led_create(pdev, IP30_LED_FAULT);
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}
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static struct platform_driver ip30led_driver = {
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.probe = ip30led_probe,
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.driver = {
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.name = "ip30-leds",
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},
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};
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module_platform_driver(ip30led_driver);
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MODULE_AUTHOR("Thomas Bogendoerfer <tbogendoerfer@suse.de>");
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MODULE_DESCRIPTION("SGI Octane LED driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:ip30-leds");
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