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/scx200_gpio.h>
  20
  21 #define DRVNAME "net48xx-led"
  22 #define NET48XX_ERROR_LED_GPIO  20
  23
  24 static struct platform_device *pdev;
  25
  26 static void net48xx_error_led_set(struct led_classdev *led_cdev,
  27                 enum led_brightness value)
  28 {
  29         if (value)
  30                 scx200_gpio_set_high(NET48XX_ERROR_LED_GPIO);
  31         else
  32                 scx200_gpio_set_low(NET48XX_ERROR_LED_GPIO);
  33 }
  34
  35 static struct led_classdev net48xx_error_led = {
  36         .name           = "net48xx:error",
  37         .brightness_set = net48xx_error_led_set,
  38 };
  39
  40 #ifdef CONFIG_PM
  41 static int net48xx_led_suspend(struct platform_device *dev,
  42                 pm_message_t state)
  43 {
  44         led_classdev_suspend(&net48xx_error_led);
  45         return 0;
  46 }
  47
  48 static int net48xx_led_resume(struct platform_device *dev)
  49 {
  50         led_classdev_resume(&net48xx_error_led);
  51         return 0;
  52 }
  53 #else
  54 #define net48xx_led_suspend NULL
  55 #define net48xx_led_resume NULL
  56 #endif
  57
  58 static int net48xx_led_probe(struct platform_device *pdev)
  59 {
  60         return led_classdev_register(&pdev->dev, &net48xx_error_led);
  61 }
  62
  63 static int net48xx_led_remove(struct platform_device *pdev)
  64 {
  65         led_classdev_unregister(&net48xx_error_led);
  66         return 0;
  67 }
  68
  69 static struct platform_driver net48xx_led_driver = {
  70         .probe          = net48xx_led_probe,
  71         .remove         = net48xx_led_remove,
  72         .suspend        = net48xx_led_suspend,
  73         .resume         = net48xx_led_resume,
  74         .driver         = {
  75                 .name           = DRVNAME,
  76                 .owner          = THIS_MODULE,
  77         },
  78 };
  79
  80 static int __init net48xx_led_init(void)
  81 {
  82         int ret;
  83
  84         if (!scx200_gpio_present()) {
  85                 ret = -ENODEV;
  86                 goto out;
  87         }
  88
  89         ret = platform_driver_register(&net48xx_led_driver);
  90         if (ret < 0)
  91                 goto out;
  92
  93         pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
  94         if (IS_ERR(pdev)) {
  95                 ret = PTR_ERR(pdev);
  96                 platform_driver_unregister(&net48xx_led_driver);
  97                 goto out;
  98         }
  99
 100 out:
 101         return ret;
 102 }
 103
 104 static void __exit net48xx_led_exit(void)
 105 {
 106         platform_device_unregister(pdev);
 107         platform_driver_unregister(&net48xx_led_driver);
 108 }
 109
 110 module_init(net48xx_led_init);
 111 module_exit(net48xx_led_exit);
 112
 113 MODULE_AUTHOR("Chris Boot <bootc@bootc.net>");
 114 MODULE_DESCRIPTION("Soekris net48xx LED driver");
 115 MODULE_LICENSE("GPL");
 116