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/io.h>
   7 #include <linux/ioport.h>
   8 #include <linux/leds.h>
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/types.h>
  12
  13 #define LED_FRONT_LEFT  0x01
  14 #define LED_FRONT_RIGHT 0x02
  15
  16 static void __iomem *led_port;
  17 static u8 led_value;
  18
  19 static void qube_front_led_set(struct led_classdev *led_cdev,
  20                                enum led_brightness brightness)
  21 {
  22         if (brightness)
  23                 led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;
  24         else
  25                 led_value = ~(LED_FRONT_LEFT | LED_FRONT_RIGHT);
  26         writeb(led_value, led_port);
  27 }
  28
  29 static struct led_classdev qube_front_led = {
  30         .name                   = "qube::front",
  31         .brightness             = LED_FULL,
  32         .brightness_set         = qube_front_led_set,
  33         .default_trigger        = "default-on",
  34 };
  35
  36 static int cobalt_qube_led_probe(struct platform_device *pdev)
  37 {
  38         struct resource *res;
  39         int retval;
  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         retval = led_classdev_register(&pdev->dev, &qube_front_led);
  53         if (retval)
  54                 goto err_null;
  55
  56         return 0;
  57
  58 err_null:
  59         led_port = NULL;
  60
  61         return retval;
  62 }
  63
  64 static int cobalt_qube_led_remove(struct platform_device *pdev)
  65 {
  66         led_classdev_unregister(&qube_front_led);
  67
  68         if (led_port)
  69                 led_port = NULL;
  70
  71         return 0;
  72 }
  73
  74 static struct platform_driver cobalt_qube_led_driver = {
  75         .probe  = cobalt_qube_led_probe,
  76         .remove = cobalt_qube_led_remove,
  77         .driver = {
  78                 .name   = "cobalt-qube-leds",
  79         },
  80 };
  81
  82 module_platform_driver(cobalt_qube_led_driver);
  83
  84 MODULE_LICENSE("GPL");
  85 MODULE_DESCRIPTION("Front LED support for Cobalt Server");
  86 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
  87 MODULE_ALIAS("platform:cobalt-qube-leds");