drivers/leds/leds-wrap.c

   1 /*
   2  * LEDs driver for PCEngines WRAP
   3  *
   4  * Copyright (C) 2006 Kristian Kielhofner <kris@krisk.org>
   5  *
   6  * Based on leds-net48xx.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 "wrap-led"
  22 #define WRAP_ERROR_LED_GPIO     3
  23 #define WRAP_EXTRA_LED_GPIO     18
  24
  25 static struct platform_device *pdev;
  26
  27 static void wrap_error_led_set(struct led_classdev *led_cdev,
  28                 enum led_brightness value)
  29 {
  30         if (value)
  31                 scx200_gpio_set_low(WRAP_ERROR_LED_GPIO);
  32         else
  33                 scx200_gpio_set_high(WRAP_ERROR_LED_GPIO);
  34 }
  35
  36 static void wrap_extra_led_set(struct led_classdev *led_cdev,
  37                 enum led_brightness value)
  38 {
  39         if (value)
  40                 scx200_gpio_set_low(WRAP_EXTRA_LED_GPIO);
  41         else
  42                 scx200_gpio_set_high(WRAP_EXTRA_LED_GPIO);
  43 }
  44
  45 static struct led_classdev wrap_error_led = {
  46         .name           = "wrap:error",
  47         .brightness_set = wrap_error_led_set,
  48 };
  49
  50 static struct led_classdev wrap_extra_led = {
  51         .name           = "wrap:extra",
  52         .brightness_set = wrap_extra_led_set,
  53 };
  54
  55 #ifdef CONFIG_PM
  56 static int wrap_led_suspend(struct platform_device *dev,
  57                 pm_message_t state)
  58 {
  59         led_classdev_suspend(&wrap_error_led);
  60         led_classdev_suspend(&wrap_extra_led);
  61         return 0;
  62 }
  63
  64 static int wrap_led_resume(struct platform_device *dev)
  65 {
  66         led_classdev_resume(&wrap_error_led);
  67         led_classdev_resume(&wrap_extra_led);
  68         return 0;
  69 }
  70 #else
  71 #define wrap_led_suspend NULL
  72 #define wrap_led_resume NULL
  73 #endif
  74
  75 static int wrap_led_probe(struct platform_device *pdev)
  76 {
  77         int ret;
  78
  79         ret = led_classdev_register(&pdev->dev, &wrap_error_led);
  80         if (ret == 0) {
  81                 ret = led_classdev_register(&pdev->dev, &wrap_extra_led);
  82                 if (ret < 0)
  83                         led_classdev_unregister(&wrap_error_led);
  84         }
  85         return ret;
  86 }
  87
  88 static int wrap_led_remove(struct platform_device *pdev)
  89 {
  90         led_classdev_unregister(&wrap_error_led);
  91         led_classdev_unregister(&wrap_extra_led);
  92         return 0;
  93 }
  94
  95 static struct platform_driver wrap_led_driver = {
  96         .probe          = wrap_led_probe,
  97         .remove         = wrap_led_remove,
  98         .suspend        = wrap_led_suspend,
  99         .resume         = wrap_led_resume,
 100         .driver         = {
 101                 .name           = DRVNAME,
 102                 .owner          = THIS_MODULE,
 103         },
 104 };
 105
 106 static int __init wrap_led_init(void)
 107 {
 108         int ret;
 109
 110         if (!scx200_gpio_present()) {
 111                 ret = -ENODEV;
 112                 goto out;
 113         }
 114
 115         ret = platform_driver_register(&wrap_led_driver);
 116         if (ret < 0)
 117                 goto out;
 118
 119         pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
 120         if (IS_ERR(pdev)) {
 121                 ret = PTR_ERR(pdev);
 122                 platform_driver_unregister(&wrap_led_driver);
 123                 goto out;
 124         }
 125
 126 out:
 127         return ret;
 128 }
 129
 130 static void __exit wrap_led_exit(void)
 131 {
 132         platform_device_unregister(pdev);
 133         platform_driver_unregister(&wrap_led_driver);
 134 }
 135
 136 module_init(wrap_led_init);
 137 module_exit(wrap_led_exit);
 138
 139 MODULE_AUTHOR("Kristian Kielhofner <kris@krisk.org>");
 140 MODULE_DESCRIPTION("PCEngines WRAP LED driver");
 141 MODULE_LICENSE("GPL");
 142