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/*
* $Id$
*
* Driver for LEDs connected to GPIO lines
*
* Copyright (C) 2007 OpenWrt.org
* Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
*
* This file was derived from:
* /drivers/led/leds-s3c24xx.c
* (c) 2006 Simtec Electronics, Ben Dooks <ben@simtec.co.uk>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/err.h>
#include <linux/gpio_leds.h>
#include <asm/io.h>
#include <asm/gpio.h>
#define DRV_NAME "gpio-led"
#define DRV_DESC "GPIO LEDs driver"
struct gpio_led_device {
struct led_classdev cdev;
struct gpio_led_platform_data *pdata;
};
static inline struct gpio_led_device *pdev_to_led(struct platform_device *dev)
{
return platform_get_drvdata(dev);
}
static inline struct gpio_led_device *class_to_led(struct led_classdev *led_cdev)
{
return container_of(led_cdev, struct gpio_led_device, cdev);
}
static void gpio_led_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
struct gpio_led_device *led;
struct gpio_led_platform_data *pdata;
led = class_to_led(led_cdev);
pdata = led->pdata;
switch (brightness) {
case LED_FULL:
gpio_direction_output(pdata->gpio, pdata->value_on);
break;
case LED_OFF:
gpio_direction_output(pdata->gpio, pdata->value_off);
break;
default:
gpio_direction_output(pdata->gpio, brightness);
break;
}
}
static int __devinit gpio_led_probe(struct platform_device *dev)
{
struct gpio_led_platform_data *pdata;
struct gpio_led_device *led;
int ret;
pdata = dev->dev.platform_data;
if (pdata == NULL) {
dev_err(&dev->dev, "no platform data, id=%d\n", dev->id);
ret = -EINVAL;
goto err;
}
if (pdata->name == NULL) {
dev_err(&dev->dev, "no led name specified\n");
ret = -EINVAL;
goto err;
}
ret = gpio_request(pdata->gpio, pdata->name);
if (ret) {
dev_err(&dev->dev, "gpio_request failed\n");
goto err;
}
led = kzalloc(sizeof(*led), GFP_KERNEL);
if (led == NULL) {
dev_err(&dev->dev, "no memory for device");
ret = -ENOMEM;
goto err_free_gpio;
}
platform_set_drvdata(dev, led);
led->pdata = pdata;
led->cdev.name = pdata->name;
led->cdev.brightness_set = gpio_led_set;
#ifdef CONFIG_LEDS_TRIGGERS
led->cdev.default_trigger = pdata->trigger;
#endif
ret = led_classdev_register(&dev->dev, &led->cdev);
if (ret < 0) {
dev_err(&dev->dev, "led_classdev_register failed");
goto err_free_led;
}
return 0;
err_free_led:
kfree(led);
err_free_gpio:
gpio_free(pdata->gpio);
err:
return ret;
}
static int __devexit gpio_led_remove(struct platform_device *dev)
{
struct gpio_led_device *led;
struct gpio_led_platform_data *pdata;
pdata = dev->dev.platform_data;
led = pdev_to_led(dev);
led_classdev_unregister(&led->cdev);
kfree(led);
gpio_free(pdata->gpio);
return 0;
}
#ifdef CONFIG_PM
static int gpio_led_suspend(struct platform_device *dev,
pm_message_t state)
{
struct gpio_led_device *led;
led = pdev_to_led(dev);
led_classdev_suspend(&led->cdev);
return 0;
}
static int gpio_led_resume(struct platform_device *dev)
{
struct gpio_led_device *led;
led = pdev_to_led(dev);
led_classdev_resume(&led->cdev);
return 0;
}
#endif /* CONFIG_PM */
static struct platform_driver gpio_led_driver = {
.probe = gpio_led_probe,
.remove = __devexit_p(gpio_led_remove),
#ifdef CONFIG_PM
.suspend = gpio_led_suspend,
.resume = gpio_led_resume,
#endif
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
};
static int __init gpio_led_init(void)
{
int ret;
ret = platform_driver_register(&gpio_led_driver);
if (ret)
printk(KERN_ALERT DRV_DESC " register failed\n");
else
printk(KERN_INFO DRV_DESC " registered\n");
return ret;
}
static void __exit gpio_led_exit(void)
{
platform_driver_unregister(&gpio_led_driver);
}
module_init(gpio_led_init);
module_exit(gpio_led_exit);
MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
MODULE_DESCRIPTION(DRV_DESC);
MODULE_LICENSE("GPL");
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