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