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Linux/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 <linux/io.h>
 19 #include <linux/scx200_gpio.h>
 20 #include <linux/module.h>
 21 
 22 #define DRVNAME "wrap-led"
 23 #define WRAP_POWER_LED_GPIO     2
 24 #define WRAP_ERROR_LED_GPIO     3
 25 #define WRAP_EXTRA_LED_GPIO     18
 26 
 27 static struct platform_device *pdev;
 28 
 29 static void wrap_power_led_set(struct led_classdev *led_cdev,
 30                 enum led_brightness value)
 31 {
 32         if (value)
 33                 scx200_gpio_set_low(WRAP_POWER_LED_GPIO);
 34         else
 35                 scx200_gpio_set_high(WRAP_POWER_LED_GPIO);
 36 }
 37 
 38 static void wrap_error_led_set(struct led_classdev *led_cdev,
 39                 enum led_brightness value)
 40 {
 41         if (value)
 42                 scx200_gpio_set_low(WRAP_ERROR_LED_GPIO);
 43         else
 44                 scx200_gpio_set_high(WRAP_ERROR_LED_GPIO);
 45 }
 46 
 47 static void wrap_extra_led_set(struct led_classdev *led_cdev,
 48                 enum led_brightness value)
 49 {
 50         if (value)
 51                 scx200_gpio_set_low(WRAP_EXTRA_LED_GPIO);
 52         else
 53                 scx200_gpio_set_high(WRAP_EXTRA_LED_GPIO);
 54 }
 55 
 56 static struct led_classdev wrap_power_led = {
 57         .name                   = "wrap::power",
 58         .brightness_set         = wrap_power_led_set,
 59         .default_trigger        = "default-on",
 60         .flags                  = LED_CORE_SUSPENDRESUME,
 61 };
 62 
 63 static struct led_classdev wrap_error_led = {
 64         .name           = "wrap::error",
 65         .brightness_set = wrap_error_led_set,
 66         .flags                  = LED_CORE_SUSPENDRESUME,
 67 };
 68 
 69 static struct led_classdev wrap_extra_led = {
 70         .name           = "wrap::extra",
 71         .brightness_set = wrap_extra_led_set,
 72         .flags                  = LED_CORE_SUSPENDRESUME,
 73 };
 74 
 75 static int wrap_led_probe(struct platform_device *pdev)
 76 {
 77         int ret;
 78 
 79         ret = led_classdev_register(&pdev->dev, &wrap_power_led);
 80         if (ret < 0)
 81                 return ret;
 82 
 83         ret = led_classdev_register(&pdev->dev, &wrap_error_led);
 84         if (ret < 0)
 85                 goto err1;
 86 
 87         ret = led_classdev_register(&pdev->dev, &wrap_extra_led);
 88         if (ret < 0)
 89                 goto err2;
 90 
 91         return ret;
 92 
 93 err2:
 94         led_classdev_unregister(&wrap_error_led);
 95 err1:
 96         led_classdev_unregister(&wrap_power_led);
 97 
 98         return ret;
 99 }
100 
101 static int wrap_led_remove(struct platform_device *pdev)
102 {
103         led_classdev_unregister(&wrap_power_led);
104         led_classdev_unregister(&wrap_error_led);
105         led_classdev_unregister(&wrap_extra_led);
106         return 0;
107 }
108 
109 static struct platform_driver wrap_led_driver = {
110         .probe          = wrap_led_probe,
111         .remove         = wrap_led_remove,
112         .driver         = {
113                 .name           = DRVNAME,
114                 .owner          = THIS_MODULE,
115         },
116 };
117 
118 static int __init wrap_led_init(void)
119 {
120         int ret;
121 
122         if (!scx200_gpio_present()) {
123                 ret = -ENODEV;
124                 goto out;
125         }
126 
127         ret = platform_driver_register(&wrap_led_driver);
128         if (ret < 0)
129                 goto out;
130 
131         pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
132         if (IS_ERR(pdev)) {
133                 ret = PTR_ERR(pdev);
134                 platform_driver_unregister(&wrap_led_driver);
135                 goto out;
136         }
137 
138 out:
139         return ret;
140 }
141 
142 static void __exit wrap_led_exit(void)
143 {
144         platform_device_unregister(pdev);
145         platform_driver_unregister(&wrap_led_driver);
146 }
147 
148 module_init(wrap_led_init);
149 module_exit(wrap_led_exit);
150 
151 MODULE_AUTHOR("Kristian Kielhofner <kris@krisk.org>");
152 MODULE_DESCRIPTION("PCEngines WRAP LED driver");
153 MODULE_LICENSE("GPL");
154 
155 

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