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 __devinit 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 = ioremap(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_iounmap;
56 
57 	return 0;
58 
59 err_iounmap:
60 	iounmap(led_port);
61 	led_port = NULL;
62 
63 	return retval;
64 }
65 
66 static int __devexit cobalt_qube_led_remove(struct platform_device *pdev)
67 {
68 	led_classdev_unregister(&qube_front_led);
69 
70 	if (led_port) {
71 		iounmap(led_port);
72 		led_port = NULL;
73 	}
74 
75 	return 0;
76 }
77 
78 /* work with hotplug and coldplug */
79 MODULE_ALIAS("platform:cobalt-qube-leds");
80 
81 static struct platform_driver cobalt_qube_led_driver = {
82 	.probe	= cobalt_qube_led_probe,
83 	.remove	= __devexit_p(cobalt_qube_led_remove),
84 	.driver	= {
85 		.name	= "cobalt-qube-leds",
86 		.owner	= THIS_MODULE,
87 	},
88 };
89 
90 static int __init cobalt_qube_led_init(void)
91 {
92 	return platform_driver_register(&cobalt_qube_led_driver);
93 }
94 
95 static void __exit cobalt_qube_led_exit(void)
96 {
97 	platform_driver_unregister(&cobalt_qube_led_driver);
98 }
99 
100 module_init(cobalt_qube_led_init);
101 module_exit(cobalt_qube_led_exit);
102 
103 MODULE_LICENSE("GPL");
104 MODULE_DESCRIPTION("Front LED support for Cobalt Server");
105 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
106