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         .default_trigger        = "default-on",
  59 };
  60
  61 static struct led_classdev wrap_error_led = {
  62         .name           = "wrap::error",
  63         .brightness_set = wrap_error_led_set,
  64 };
  65
  66 static struct led_classdev wrap_extra_led = {
  67         .name           = "wrap::extra",
  68         .brightness_set = wrap_extra_led_set,
  69 };
  70
  71 #ifdef CONFIG_PM
  72 static int wrap_led_suspend(struct platform_device *dev,
  73                 pm_message_t state)
  74 {
  75         led_classdev_suspend(&wrap_power_led);
  76         led_classdev_suspend(&wrap_error_led);
  77         led_classdev_suspend(&wrap_extra_led);
  78         return 0;
  79 }
  80
  81 static int wrap_led_resume(struct platform_device *dev)
  82 {
  83         led_classdev_resume(&wrap_power_led);
  84         led_classdev_resume(&wrap_error_led);
  85         led_classdev_resume(&wrap_extra_led);
  86         return 0;
  87 }
  88 #else
  89 #define wrap_led_suspend NULL
  90 #define wrap_led_resume NULL
  91 #endif
  92
  93 static int wrap_led_probe(struct platform_device *pdev)
  94 {
  95         int ret;
  96
  97         ret = led_classdev_register(&pdev->dev, &wrap_power_led);
  98         if (ret < 0)
  99                 return ret;
 100
 101         ret = led_classdev_register(&pdev->dev, &wrap_error_led);
 102         if (ret < 0)
 103                 goto err1;
 104
 105         ret = led_classdev_register(&pdev->dev, &wrap_extra_led);
 106         if (ret < 0)
 107                 goto err2;
 108
 109         return ret;
 110
 111 err2:
 112         led_classdev_unregister(&wrap_error_led);
 113 err1:
 114         led_classdev_unregister(&wrap_power_led);
 115
 116         return ret;
 117 }
 118
 119 static int wrap_led_remove(struct platform_device *pdev)
 120 {
 121         led_classdev_unregister(&wrap_power_led);
 122         led_classdev_unregister(&wrap_error_led);
 123         led_classdev_unregister(&wrap_extra_led);
 124         return 0;
 125 }
 126
 127 static struct platform_driver wrap_led_driver = {
 128         .probe          = wrap_led_probe,
 129         .remove         = wrap_led_remove,
 130         .suspend        = wrap_led_suspend,
 131         .resume         = wrap_led_resume,
 132         .driver         = {
 133                 .name           = DRVNAME,
 134                 .owner          = THIS_MODULE,
 135         },
 136 };
 137
 138 static int __init wrap_led_init(void)
 139 {
 140         int ret;
 141
 142         if (!scx200_gpio_present()) {
 143                 ret = -ENODEV;
 144                 goto out;
 145         }
 146
 147         ret = platform_driver_register(&wrap_led_driver);
 148         if (ret < 0)
 149                 goto out;
 150
 151         pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
 152         if (IS_ERR(pdev)) {
 153                 ret = PTR_ERR(pdev);
 154                 platform_driver_unregister(&wrap_led_driver);
 155                 goto out;
 156         }
 157
 158 out:
 159         return ret;
 160 }
 161
 162 static void __exit wrap_led_exit(void)
 163 {
 164         platform_device_unregister(pdev);
 165         platform_driver_unregister(&wrap_led_driver);
 166 }
 167
 168 module_init(wrap_led_init);
 169 module_exit(wrap_led_exit);
 170
 171 MODULE_AUTHOR("Kristian Kielhofner <kris@krisk.org>");
 172 MODULE_DESCRIPTION("PCEngines WRAP LED driver");
 173 MODULE_LICENSE("GPL");
 174