drivers/leds/leds-cobalt-qube.c

   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>");