drivers/leds/leds-net48xx.c

   1 /*
   2  * LEDs driver for Soekris net48xx
   3  *
   4  * Copyright (C) 2006 Chris Boot <bootc@bootc.net>
   5  *
   6  * Based on leds-ams-delta.c
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/leds.h>
  17 #include <linux/err.h>
  18 #include <asm/io.h>
  19 #include <linux/nsc_gpio.h>
  20 #include <linux/scx200_gpio.h>
  21 #include <linux/module.h>
  22
  23 #define DRVNAME "net48xx-led"
  24 #define NET48XX_ERROR_LED_GPIO  20
  25
  26 static struct platform_device *pdev;
  27
  28 static void net48xx_error_led_set(struct led_classdev *led_cdev,
  29                 enum led_brightness value)
  30 {
  31         scx200_gpio_ops.gpio_set(NET48XX_ERROR_LED_GPIO, value ? 1 : 0);
  32 }
  33
  34 static struct led_classdev net48xx_error_led = {
  35         .name           = "net48xx::error",
  36         .brightness_set = net48xx_error_led_set,
  37         .flags          = LED_CORE_SUSPENDRESUME,
  38 };
  39
  40 static int net48xx_led_probe(struct platform_device *pdev)
  41 {
  42         return led_classdev_register(&pdev->dev, &net48xx_error_led);
  43 }
  44
  45 static int net48xx_led_remove(struct platform_device *pdev)
  46 {
  47         led_classdev_unregister(&net48xx_error_led);
  48         return 0;
  49 }
  50
  51 static struct platform_driver net48xx_led_driver = {
  52         .probe          = net48xx_led_probe,
  53         .remove         = net48xx_led_remove,
  54         .driver         = {
  55                 .name           = DRVNAME,
  56                 .owner          = THIS_MODULE,
  57         },
  58 };
  59
  60 static int __init net48xx_led_init(void)
  61 {
  62         int ret;
  63
  64         /* small hack, but scx200_gpio doesn't set .dev if the probe fails */
  65         if (!scx200_gpio_ops.dev) {
  66                 ret = -ENODEV;
  67                 goto out;
  68         }
  69
  70         ret = platform_driver_register(&net48xx_led_driver);
  71         if (ret < 0)
  72                 goto out;
  73
  74         pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
  75         if (IS_ERR(pdev)) {
  76                 ret = PTR_ERR(pdev);
  77                 platform_driver_unregister(&net48xx_led_driver);
  78                 goto out;
  79         }
  80
  81 out:
  82         return ret;
  83 }
  84
  85 static void __exit net48xx_led_exit(void)
  86 {
  87         platform_device_unregister(pdev);
  88         platform_driver_unregister(&net48xx_led_driver);
  89 }
  90
  91 module_init(net48xx_led_init);
  92 module_exit(net48xx_led_exit);
  93
  94 MODULE_AUTHOR("Chris Boot <bootc@bootc.net>");
  95 MODULE_DESCRIPTION("Soekris net48xx LED driver");
  96 MODULE_LICENSE("GPL");
  97