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Linux/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 <linux/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         },
 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 
 97 

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