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