1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2006 - Florian Fainelli <florian@openwrt.org>
4  *
5  * Control the Cobalt Qube/RaQ front LED
6  */
7 #include <linux/io.h>
8 #include <linux/ioport.h>
9 #include <linux/leds.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/types.h>
13 
14 #define LED_FRONT_LEFT	0x01
15 #define LED_FRONT_RIGHT	0x02
16 
17 static void __iomem *led_port;
18 static u8 led_value;
19 
qube_front_led_set(struct led_classdev * led_cdev,enum led_brightness brightness)20 static void qube_front_led_set(struct led_classdev *led_cdev,
21 			       enum led_brightness brightness)
22 {
23 	if (brightness)
24 		led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;
25 	else
26 		led_value = ~(LED_FRONT_LEFT | LED_FRONT_RIGHT);
27 	writeb(led_value, led_port);
28 }
29 
30 static struct led_classdev qube_front_led = {
31 	.name			= "qube::front",
32 	.brightness		= LED_FULL,
33 	.brightness_set		= qube_front_led_set,
34 	.default_trigger	= "default-on",
35 };
36 
cobalt_qube_led_probe(struct platform_device * pdev)37 static int cobalt_qube_led_probe(struct platform_device *pdev)
38 {
39 	struct resource *res;
40 
41 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
42 	if (!res)
43 		return -EBUSY;
44 
45 	led_port = devm_ioremap(&pdev->dev, res->start, resource_size(res));
46 	if (!led_port)
47 		return -ENOMEM;
48 
49 	led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;
50 	writeb(led_value, led_port);
51 
52 	return devm_led_classdev_register(&pdev->dev, &qube_front_led);
53 }
54 
55 static struct platform_driver cobalt_qube_led_driver = {
56 	.probe	= cobalt_qube_led_probe,
57 	.driver	= {
58 		.name	= "cobalt-qube-leds",
59 	},
60 };
61 
62 module_platform_driver(cobalt_qube_led_driver);
63 
64 MODULE_LICENSE("GPL");
65 MODULE_DESCRIPTION("Front LED support for Cobalt Server");
66 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
67 MODULE_ALIAS("platform:cobalt-qube-leds");
68