1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * LED Driver for SGI Octane machines
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <asm/io.h>
7*4882a593Smuzhiyun #include <linux/module.h>
8*4882a593Smuzhiyun #include <linux/kernel.h>
9*4882a593Smuzhiyun #include <linux/platform_device.h>
10*4882a593Smuzhiyun #include <linux/leds.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #define IP30_LED_SYSTEM 0
13*4882a593Smuzhiyun #define IP30_LED_FAULT 1
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun struct ip30_led {
16*4882a593Smuzhiyun struct led_classdev cdev;
17*4882a593Smuzhiyun u32 __iomem *reg;
18*4882a593Smuzhiyun };
19*4882a593Smuzhiyun
ip30led_set(struct led_classdev * led_cdev,enum led_brightness value)20*4882a593Smuzhiyun static void ip30led_set(struct led_classdev *led_cdev,
21*4882a593Smuzhiyun enum led_brightness value)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun struct ip30_led *led = container_of(led_cdev, struct ip30_led, cdev);
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun writel(value, led->reg);
26*4882a593Smuzhiyun }
27*4882a593Smuzhiyun
ip30led_create(struct platform_device * pdev,int num)28*4882a593Smuzhiyun static int ip30led_create(struct platform_device *pdev, int num)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun struct resource *res;
31*4882a593Smuzhiyun struct ip30_led *data;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun res = platform_get_resource(pdev, IORESOURCE_MEM, num);
34*4882a593Smuzhiyun if (!res)
35*4882a593Smuzhiyun return -EBUSY;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
38*4882a593Smuzhiyun if (!data)
39*4882a593Smuzhiyun return -ENOMEM;
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun data->reg = devm_ioremap_resource(&pdev->dev, res);
42*4882a593Smuzhiyun if (IS_ERR(data->reg))
43*4882a593Smuzhiyun return PTR_ERR(data->reg);
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun switch (num) {
47*4882a593Smuzhiyun case IP30_LED_SYSTEM:
48*4882a593Smuzhiyun data->cdev.name = "white:power";
49*4882a593Smuzhiyun break;
50*4882a593Smuzhiyun case IP30_LED_FAULT:
51*4882a593Smuzhiyun data->cdev.name = "red:fault";
52*4882a593Smuzhiyun break;
53*4882a593Smuzhiyun default:
54*4882a593Smuzhiyun return -EINVAL;
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun data->cdev.brightness = readl(data->reg);
58*4882a593Smuzhiyun data->cdev.max_brightness = 1;
59*4882a593Smuzhiyun data->cdev.brightness_set = ip30led_set;
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun return devm_led_classdev_register(&pdev->dev, &data->cdev);
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
ip30led_probe(struct platform_device * pdev)64*4882a593Smuzhiyun static int ip30led_probe(struct platform_device *pdev)
65*4882a593Smuzhiyun {
66*4882a593Smuzhiyun int ret;
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun ret = ip30led_create(pdev, IP30_LED_SYSTEM);
69*4882a593Smuzhiyun if (ret < 0)
70*4882a593Smuzhiyun return ret;
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun return ip30led_create(pdev, IP30_LED_FAULT);
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun static struct platform_driver ip30led_driver = {
76*4882a593Smuzhiyun .probe = ip30led_probe,
77*4882a593Smuzhiyun .driver = {
78*4882a593Smuzhiyun .name = "ip30-leds",
79*4882a593Smuzhiyun },
80*4882a593Smuzhiyun };
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun module_platform_driver(ip30led_driver);
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun MODULE_AUTHOR("Thomas Bogendoerfer <tbogendoerfer@suse.de>");
85*4882a593Smuzhiyun MODULE_DESCRIPTION("SGI Octane LED driver");
86*4882a593Smuzhiyun MODULE_LICENSE("GPL");
87*4882a593Smuzhiyun MODULE_ALIAS("platform:ip30-leds");
88