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 };
  37
  38 #ifdef CONFIG_PM
  39 static int net48xx_led_suspend(struct platform_device *dev,
  40                 pm_message_t state)
  41 {
  42         led_classdev_suspend(&net48xx_error_led);
  43         return 0;
  44 }
  45
  46 static int net48xx_led_resume(struct platform_device *dev)
  47 {
  48         led_classdev_resume(&net48xx_error_led);
  49         return 0;
  50 }
  51 #else
  52 #define net48xx_led_suspend NULL
  53 #define net48xx_led_resume NULL
  54 #endif
  55
  56 static int net48xx_led_probe(struct platform_device *pdev)
  57 {
  58         return led_classdev_register(&pdev->dev, &net48xx_error_led);
  59 }
  60
  61 static int net48xx_led_remove(struct platform_device *pdev)
  62 {
  63         led_classdev_unregister(&net48xx_error_led);
  64         return 0;
  65 }
  66
  67 static struct platform_driver net48xx_led_driver = {
  68         .probe          = net48xx_led_probe,
  69         .remove         = net48xx_led_remove,
  70         .suspend        = net48xx_led_suspend,
  71         .resume         = net48xx_led_resume,
  72         .driver         = {
  73                 .name           = DRVNAME,
  74                 .owner          = THIS_MODULE,
  75         },
  76 };
  77
  78 static int __init net48xx_led_init(void)
  79 {
  80         int ret;
  81
  82         /* small hack, but scx200_gpio doesn't set .dev if the probe fails */
  83         if (!scx200_gpio_ops.dev) {
  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(DRVNAME, -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