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/*
* LED driver for the RouterBOARD 750
*
* Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
*
* 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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <asm/mach-ath79/mach-rb750.h>
#define DRV_NAME "leds-rb750"
struct rb750_led_dev {
struct led_classdev cdev;
u32 mask;
int active_low;
void (*latch_change)(u32 clear, u32 set);
};
struct rb750_led_drvdata {
struct rb750_led_dev *led_devs;
int num_leds;
};
static inline struct rb750_led_dev *to_rbled(struct led_classdev *led_cdev)
{
return (struct rb750_led_dev *)container_of(led_cdev,
struct rb750_led_dev, cdev);
}
static void rb750_led_brightness_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct rb750_led_dev *rbled = to_rbled(led_cdev);
int level;
level = (value == LED_OFF) ? 0 : 1;
level ^= rbled->active_low;
if (level)
rbled->latch_change(0, rbled->mask);
else
rbled->latch_change(rbled->mask, 0);
}
static int rb750_led_probe(struct platform_device *pdev)
{
struct rb750_led_platform_data *pdata;
struct rb750_led_drvdata *drvdata;
int ret = 0;
int i;
pdata = pdev->dev.platform_data;
if (!pdata)
return -EINVAL;
drvdata = kzalloc(sizeof(struct rb750_led_drvdata) +
sizeof(struct rb750_led_dev) * pdata->num_leds,
GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
drvdata->num_leds = pdata->num_leds;
drvdata->led_devs = (struct rb750_led_dev *) &drvdata[1];
for (i = 0; i < drvdata->num_leds; i++) {
struct rb750_led_dev *rbled = &drvdata->led_devs[i];
struct rb750_led_data *led_data = &pdata->leds[i];
rbled->cdev.name = led_data->name;
rbled->cdev.default_trigger = led_data->default_trigger;
rbled->cdev.brightness_set = rb750_led_brightness_set;
rbled->cdev.brightness = LED_OFF;
rbled->mask = led_data->mask;
rbled->active_low = !!led_data->active_low;
rbled->latch_change = pdata->latch_change;
ret = led_classdev_register(&pdev->dev, &rbled->cdev);
if (ret)
goto err;
}
platform_set_drvdata(pdev, drvdata);
return 0;
err:
for (i = i - 1; i >= 0; i--)
led_classdev_unregister(&drvdata->led_devs[i].cdev);
kfree(drvdata);
return ret;
}
static int rb750_led_remove(struct platform_device *pdev)
{
struct rb750_led_drvdata *drvdata;
int i;
drvdata = platform_get_drvdata(pdev);
for (i = 0; i < drvdata->num_leds; i++)
led_classdev_unregister(&drvdata->led_devs[i].cdev);
kfree(drvdata);
return 0;
}
static struct platform_driver rb750_led_driver = {
.probe = rb750_led_probe,
.remove = rb750_led_remove,
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
};
MODULE_ALIAS("platform:leds-rb750");
static int __init rb750_led_init(void)
{
return platform_driver_register(&rb750_led_driver);
}
static void __exit rb750_led_exit(void)
{
platform_driver_unregister(&rb750_led_driver);
}
module_init(rb750_led_init);
module_exit(rb750_led_exit);
MODULE_DESCRIPTION(DRV_NAME);
MODULE_DESCRIPTION("LED driver for the RouterBOARD 750");
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
MODULE_LICENSE("GPL v2");
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