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_POWER_LED_GPIO     2
  23 #define WRAP_ERROR_LED_GPIO     3
  24 #define WRAP_EXTRA_LED_GPIO     18
  25
  26 static struct platform_device *pdev;
  27
  28 static void wrap_power_led_set(struct led_classdev *led_cdev,
  29                 enum led_brightness value)
  30 {
  31         if (value)
  32                 scx200_gpio_set_low(WRAP_POWER_LED_GPIO);
  33         else
  34                 scx200_gpio_set_high(WRAP_POWER_LED_GPIO);
  35 }
  36
  37 static void wrap_error_led_set(struct led_classdev *led_cdev,
  38                 enum led_brightness value)
  39 {
  40         if (value)
  41                 scx200_gpio_set_low(WRAP_ERROR_LED_GPIO);
  42         else
  43                 scx200_gpio_set_high(WRAP_ERROR_LED_GPIO);
  44 }
  45
  46 static void wrap_extra_led_set(struct led_classdev *led_cdev,
  47                 enum led_brightness value)
  48 {
  49         if (value)
  50                 scx200_gpio_set_low(WRAP_EXTRA_LED_GPIO);
  51         else
  52                 scx200_gpio_set_high(WRAP_EXTRA_LED_GPIO);
  53 }
  54
  55 static struct led_classdev wrap_power_led = {
  56         .name           = "wrap::power",
  57         .brightness_set = wrap_power_led_set,
  58 };
  59
  60 static struct led_classdev wrap_error_led = {
  61         .name           = "wrap::error",
  62         .brightness_set = wrap_error_led_set,
  63 };
  64
  65 static struct led_classdev wrap_extra_led = {
  66         .name           = "wrap::extra",
  67         .brightness_set = wrap_extra_led_set,
  68 };
  69
  70 #ifdef CONFIG_PM
  71 static int wrap_led_suspend(struct platform_device *dev,
  72                 pm_message_t state)
  73 {
  74         led_classdev_suspend(&wrap_power_led);
  75         led_classdev_suspend(&wrap_error_led);
  76         led_classdev_suspend(&wrap_extra_led);
  77         return 0;
  78 }
  79
  80 static int wrap_led_resume(struct platform_device *dev)
  81 {
  82         led_classdev_resume(&wrap_power_led);
  83         led_classdev_resume(&wrap_error_led);
  84         led_classdev_resume(&wrap_extra_led);
  85         return 0;
  86 }
  87 #else
  88 #define wrap_led_suspend NULL
  89 #define wrap_led_resume NULL
  90 #endif
  91
  92 static int wrap_led_probe(struct platform_device *pdev)
  93 {
  94         int ret;
  95
  96         ret = led_classdev_register(&pdev->dev, &wrap_power_led);
  97         if (ret < 0)
  98                 return ret;
  99
 100         ret = led_classdev_register(&pdev->dev, &wrap_error_led);
 101         if (ret < 0)
 102                 goto err1;
 103
 104         ret = led_classdev_register(&pdev->dev, &wrap_extra_led);
 105         if (ret < 0)
 106                 goto err2;
 107
 108         return ret;
 109
 110 err2:
 111         led_classdev_unregister(&wrap_error_led);
 112 err1:
 113         led_classdev_unregister(&wrap_power_led);
 114
 115         return ret;
 116 }
 117
 118 static int wrap_led_remove(struct platform_device *pdev)
 119 {
 120         led_classdev_unregister(&wrap_power_led);
 121         led_classdev_unregister(&wrap_error_led);
 122         led_classdev_unregister(&wrap_extra_led);
 123         return 0;
 124 }
 125
 126 static struct platform_driver wrap_led_driver = {
 127         .probe          = wrap_led_probe,
 128         .remove         = wrap_led_remove,
 129         .suspend        = wrap_led_suspend,
 130         .resume         = wrap_led_resume,
 131         .driver         = {
 132                 .name           = DRVNAME,
 133                 .owner          = THIS_MODULE,
 134         },
 135 };
 136
 137 static int __init wrap_led_init(void)
 138 {
 139         int ret;
 140
 141         if (!scx200_gpio_present()) {
 142                 ret = -ENODEV;
 143                 goto out;
 144         }
 145
 146         ret = platform_driver_register(&wrap_led_driver);
 147         if (ret < 0)
 148                 goto out;
 149
 150         pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
 151         if (IS_ERR(pdev)) {
 152                 ret = PTR_ERR(pdev);
 153                 platform_driver_unregister(&wrap_led_driver);
 154                 goto out;
 155         }
 156
 157 out:
 158         return ret;
 159 }
 160
 161 static void __exit wrap_led_exit(void)
 162 {
 163         platform_device_unregister(pdev);
 164         platform_driver_unregister(&wrap_led_driver);
 165 }
 166
 167 module_init(wrap_led_init);
 168 module_exit(wrap_led_exit);
 169
 170 MODULE_AUTHOR("Kristian Kielhofner <kris@krisk.org>");
 171 MODULE_DESCRIPTION("PCEngines WRAP LED driver");
 172 MODULE_LICENSE("GPL");
 173