1// SPDX-License-Identifier: GPL-2.0
2/*
3 * LED Driver for SGI Octane machines
4 */
5
6#include <asm/io.h>
7#include <linux/module.h>
8#include <linux/kernel.h>
9#include <linux/platform_device.h>
10#include <linux/leds.h>
11
12#define IP30_LED_SYSTEM 0
13#define IP30_LED_FAULT 1
14
15struct ip30_led {
16 struct led_classdev cdev;
17 u32 __iomem *reg;
18};
19
20static void ip30led_set(struct led_classdev *led_cdev,
21 enum led_brightness value)
22{
23 struct ip30_led *led = container_of(led_cdev, struct ip30_led, cdev);
24
25 writel(val: value, addr: led->reg);
26}
27
28static int ip30led_create(struct platform_device *pdev, int num)
29{
30 struct ip30_led *data;
31
32 data = devm_kzalloc(dev: &pdev->dev, size: sizeof(*data), GFP_KERNEL);
33 if (!data)
34 return -ENOMEM;
35
36 data->reg = devm_platform_ioremap_resource(pdev, index: num);
37 if (IS_ERR(ptr: data->reg))
38 return PTR_ERR(ptr: data->reg);
39
40 switch (num) {
41 case IP30_LED_SYSTEM:
42 data->cdev.name = "white:power";
43 break;
44 case IP30_LED_FAULT:
45 data->cdev.name = "red:fault";
46 break;
47 default:
48 return -EINVAL;
49 }
50
51 data->cdev.brightness = readl(addr: data->reg);
52 data->cdev.max_brightness = 1;
53 data->cdev.brightness_set = ip30led_set;
54
55 return devm_led_classdev_register(parent: &pdev->dev, led_cdev: &data->cdev);
56}
57
58static int ip30led_probe(struct platform_device *pdev)
59{
60 int ret;
61
62 ret = ip30led_create(pdev, IP30_LED_SYSTEM);
63 if (ret < 0)
64 return ret;
65
66 return ip30led_create(pdev, IP30_LED_FAULT);
67}
68
69static struct platform_driver ip30led_driver = {
70 .probe = ip30led_probe,
71 .driver = {
72 .name = "ip30-leds",
73 },
74};
75
76module_platform_driver(ip30led_driver);
77
78MODULE_AUTHOR("Thomas Bogendoerfer <tbogendoerfer@suse.de>");
79MODULE_DESCRIPTION("SGI Octane LED driver");
80MODULE_LICENSE("GPL");
81MODULE_ALIAS("platform:ip30-leds");
82

source code of linux/drivers/leds/leds-ip30.c