LXR linux/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
  16static void __iomem *led_port;
  17static u8 led_value;
  18
  19static 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
  29static 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
  36static 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
  58err_null:
  59        led_port = NULL;
  60
  61        return retval;
  62}
  63
  64static 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
  74static 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
  82module_platform_driver(cobalt_qube_led_driver);
  83
  84MODULE_LICENSE("GPL");
  85MODULE_DESCRIPTION("Front LED support for Cobalt Server");
  86MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
  87MODULE_ALIAS("platform:cobalt-qube-leds");
  88