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/*
* LED Class Core
*
* Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
* Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/sysdev.h>
#include <linux/timer.h>
#include <linux/err.h>
#include <linux/ctype.h>
#include <linux/leds.h>
#include "leds.h"
static struct class *leds_class;
static void led_update_color(struct led_classdev *led_cdev)
{
if (led_cdev->color_get)
led_cdev->color = led_cdev->color_get(led_cdev);
}
static ssize_t led_color_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
unsigned long state = 9;
switch (buf[0]) {
case 'r': /* red */
state = 1;
break;
case 'g': /* green */
state = 2;
break;
case 'b': /* blue */
state = 3;
break;
case 'y': /* yellow */
state = 4;
break;
case 'w': /* white */
state = 5;
break;
case 'o': /* off */
state = 0;
break;
default:
break;
}
led_set_color(led_cdev, state);
return (ssize_t)size;
}
static ssize_t led_color_show(struct device *dev,
struct device_attribute *attr, char *buf) {
struct led_classdev *led_cdev = dev_get_drvdata(dev);
char * readbuf[] = {"off", "red", "green", "blue", "yellow", "white"} ;
/* no lock needed for this */
led_update_color(led_cdev);
return sprintf(buf, "%s\n", readbuf[led_cdev->color]);
}
static ssize_t led_blink_show(struct device *dev, struct device_attribute *attr,
char *buf) {
char *blinkStr = "no";
struct led_classdev *led_cdev = dev_get_drvdata(dev);
if( led_cdev->blink == 0 ){
blinkStr = "no";
}
else if (led_cdev->blink == 1 ){
blinkStr = "yes";
}
return sprintf(buf, "%s\n", blinkStr);
}
static ssize_t led_blink_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size) {
int val = 0;
struct led_classdev * led_cdev = dev_get_drvdata(dev);
if( buf[0] == 'y' ) {
val = 1;
}
else if( buf[0] == 'n' ) {
val = 0;
}
else if( buf[0] == 'f' ) {
val = 2;
}
led_set_blink( led_cdev, val );
return (ssize_t)size;
}
static ssize_t led_max_brightness_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
return sprintf(buf, "%u\n", led_cdev->max_brightness);
}
/*static DEVICE_ATTR(brightness, 0644, led_brightness_show, led_brightness_store);*/
static DEVICE_ATTR(color, 0644, led_color_show, led_color_store);
static DEVICE_ATTR(blink, 0644, led_blink_show, led_blink_store);
static DEVICE_ATTR(max_brightness, 0444, led_max_brightness_show, NULL);
#ifdef CONFIG_LEDS_TRIGGERS
static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store);
#endif
/**
* led_classdev_suspend - suspend an led_classdev.
* @led_cdev: the led_classdev to suspend.
*/
void led_classdev_suspend(struct led_classdev *led_cdev)
{
led_cdev->flags |= LED_SUSPENDED;
led_cdev->color_set(led_cdev, 0);
}
EXPORT_SYMBOL_GPL(led_classdev_suspend);
/**
* led_classdev_resume - resume an led_classdev.
* @led_cdev: the led_classdev to resume.
*/
void led_classdev_resume(struct led_classdev *led_cdev)
{
led_cdev->color_set(led_cdev, led_cdev->color);
led_cdev->flags &= ~LED_SUSPENDED;
}
EXPORT_SYMBOL_GPL(led_classdev_resume);
static int led_suspend(struct device *dev, pm_message_t state)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
led_classdev_suspend(led_cdev);
return 0;
}
static int led_resume(struct device *dev)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
led_classdev_resume(led_cdev);
return 0;
}
/**
* led_classdev_register - register a new object of led_classdev class.
* @parent: The device to register.
* @led_cdev: the led_classdev structure for this device.
*/
int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
{
int rc;
led_cdev->dev = device_create(leds_class, parent, 0, led_cdev,
"%s", led_cdev->name);
if (IS_ERR(led_cdev->dev))
return PTR_ERR(led_cdev->dev);
/* register the attributes */
rc = device_create_file(led_cdev->dev, &dev_attr_color);
if (rc)
goto err_out;
rc = device_create_file(led_cdev->dev, &dev_attr_blink);
if (rc)
goto err_out;
#ifdef CONFIG_LEDS_TRIGGERS
init_rwsem(&led_cdev->trigger_lock);
#endif
/* add to the list of leds */
down_write(&leds_list_lock);
list_add_tail(&led_cdev->node, &leds_list);
up_write(&leds_list_lock);
if (!led_cdev->max_brightness)
led_cdev->max_brightness = LED_FULL;
rc = device_create_file(led_cdev->dev, &dev_attr_max_brightness);
if (rc)
goto err_out_attr_max;
led_update_color(led_cdev);
#ifdef CONFIG_LEDS_TRIGGERS
rc = device_create_file(led_cdev->dev, &dev_attr_trigger);
if (rc)
goto err_out_led_list;
led_trigger_set_default(led_cdev);
#endif
printk(KERN_INFO "Registered led device: %s\n",
led_cdev->name);
return 0;
#ifdef CONFIG_LEDS_TRIGGERS
err_out_led_list:
device_remove_file(led_cdev->dev, &dev_attr_max_brightness);
#endif
err_out_attr_max:
device_remove_file(led_cdev->dev, &dev_attr_color);
list_del(&led_cdev->node);
err_out:
device_unregister(led_cdev->dev);
return rc;
}
EXPORT_SYMBOL_GPL(led_classdev_register);
/**
* led_classdev_unregister - unregisters a object of led_properties class.
* @led_cdev: the led device to unregister
*
* Unregisters a previously registered via led_classdev_register object.
*/
void led_classdev_unregister(struct led_classdev *led_cdev)
{
device_remove_file(led_cdev->dev, &dev_attr_max_brightness);
device_remove_file(led_cdev->dev, &dev_attr_color);
#ifdef CONFIG_LEDS_TRIGGERS
device_remove_file(led_cdev->dev, &dev_attr_trigger);
down_write(&led_cdev->trigger_lock);
if (led_cdev->trigger)
led_trigger_set(led_cdev, NULL);
up_write(&led_cdev->trigger_lock);
#endif
device_unregister(led_cdev->dev);
down_write(&leds_list_lock);
list_del(&led_cdev->node);
up_write(&leds_list_lock);
}
EXPORT_SYMBOL_GPL(led_classdev_unregister);
static int __init leds_init(void)
{
leds_class = class_create(THIS_MODULE, "leds");
if (IS_ERR(leds_class))
return PTR_ERR(leds_class);
leds_class->suspend = led_suspend;
leds_class->resume = led_resume;
return 0;
}
static void __exit leds_exit(void)
{
class_destroy(leds_class);
}
subsys_initcall(leds_init);
module_exit(leds_exit);
MODULE_AUTHOR("John Lenz, Richard Purdie");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LED Class Interface");
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