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/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
  17static void __iomem *led_port;
  18static u8 led_value;
  19
  20static 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
  30static 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
  37static 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
  59err_null:
  60        led_port = NULL;
  61
  62        return retval;
  63}
  64
  65static 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
  75static 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
  84module_platform_driver(cobalt_qube_led_driver);
  85
  86MODULE_LICENSE("GPL");
  87MODULE_DESCRIPTION("Front LED support for Cobalt Server");
  88MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
  89MODULE_ALIAS("platform:cobalt-qube-leds");
  90