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
  22 #define DRVNAME "net48xx-led"
  23 #define NET48XX_ERROR_LED_GPIO  20
  24
  25 static struct platform_device *pdev;
  26
  27 static void net48xx_error_led_set(struct led_classdev *led_cdev,
  28                 enum led_brightness value)
  29 {
  30         scx200_gpio_ops.gpio_set(NET48XX_ERROR_LED_GPIO, value ? 1 : 0);
  31 }
  32
  33 static struct led_classdev net48xx_error_led = {
  34         .name           = "net48xx::error",
  35         .brightness_set = net48xx_error_led_set,
  36         .flags          = LED_CORE_SUSPENDRESUME,
  37 };
  38
  39 static int net48xx_led_probe(struct platform_device *pdev)
  40 {
  41         return led_classdev_register(&pdev->dev, &net48xx_error_led);
  42 }
  43
  44 static int net48xx_led_remove(struct platform_device *pdev)
  45 {
  46         led_classdev_unregister(&net48xx_error_led);
  47         return 0;
  48 }
  49
  50 static struct platform_driver net48xx_led_driver = {
  51         .probe          = net48xx_led_probe,
  52         .remove         = net48xx_led_remove,
  53         .driver         = {
  54                 .name           = DRVNAME,
  55                 .owner          = THIS_MODULE,
  56         },
  57 };
  58
  59 static int __init net48xx_led_init(void)
  60 {
  61         int ret;
  62
  63         /* small hack, but scx200_gpio doesn't set .dev if the probe fails */
  64         if (!scx200_gpio_ops.dev) {
  65                 ret = -ENODEV;
  66                 goto out;
  67         }
  68
  69         ret = platform_driver_register(&net48xx_led_driver);
  70         if (ret < 0)
  71                 goto out;
  72
  73         pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
  74         if (IS_ERR(pdev)) {
  75                 ret = PTR_ERR(pdev);
  76                 platform_driver_unregister(&net48xx_led_driver);
  77                 goto out;
  78         }
  79
  80 out:
  81         return ret;
  82 }
  83
  84 static void __exit net48xx_led_exit(void)
  85 {
  86         platform_device_unregister(pdev);
  87         platform_driver_unregister(&net48xx_led_driver);
  88 }
  89
  90 module_init(net48xx_led_init);
  91 module_exit(net48xx_led_exit);
  92
  93 MODULE_AUTHOR("Chris Boot <bootc@bootc.net>");
  94 MODULE_DESCRIPTION("Soekris net48xx LED driver");
  95 MODULE_LICENSE("GPL");
  96