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 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");