1 /*
2  * Copyright 2006 - Florian Fainelli <florian@openwrt.org>
3  *
4  * Control the Cobalt Qube/RaQ front LED
5  */
6 #include <linux/init.h>
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 
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 
37 static int cobalt_qube_led_probe(struct platform_device *pdev)
38 {
39 	struct resource *res;
40 	int retval;
41 
42 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
43 	if (!res)
44 		return -EBUSY;
45 
46 	led_port = devm_ioremap(&pdev->dev, res->start, resource_size(res));
47 	if (!led_port)
48 		return -ENOMEM;
49 
50 	led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;
51 	writeb(led_value, led_port);
52 
53 	retval = led_classdev_register(&pdev->dev, &qube_front_led);
54 	if (retval)
55 		goto err_null;
56 
57 	return 0;
58 
59 err_null:
60 	led_port = NULL;
61 
62 	return retval;
63 }
64 
65 static int cobalt_qube_led_remove(struct platform_device *pdev)
66 {
67 	led_classdev_unregister(&qube_front_led);
68 
69 	if (led_port)
70 		led_port = NULL;
71 
72 	return 0;
73 }
74 
75 static struct platform_driver cobalt_qube_led_driver = {
76 	.probe	= cobalt_qube_led_probe,
77 	.remove	= cobalt_qube_led_remove,
78 	.driver	= {
79 		.name	= "cobalt-qube-leds",
80 		.owner	= THIS_MODULE,
81 	},
82 };
83 
84 module_platform_driver(cobalt_qube_led_driver);
85 
86 MODULE_LICENSE("GPL");
87 MODULE_DESCRIPTION("Front LED support for Cobalt Server");
88 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
89 MODULE_ALIAS("platform:cobalt-qube-leds");
90