mini2440Led驱动——linux-3.10.59

/* linux/drivers/char/mini2440_leds.c
*	Copyright (c) 2013 Feng Guoqing
*
* mini2440 LEDs Driver
*
* This file is subject to the terms and conditions of the GNU General Public
* License.  See the file COPYING in the main directory of this archive for
* more details.
*
*/

#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <asm/irq.h>
#include <mach/regs-gpio.h>
#include <mach/hardware.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/ioctl.h>
#include <linux/cdev.h>
#include <linux/string.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <linux/gpio.h>
#include <asm/uaccess.h>
#include <asm/atomic.h>
#include <asm/unistd.h>

#define DEVICE_NAME "leds"

static unsigned long led_table [] = {
S3C2410_GPB(5),
S3C2410_GPB(6),
S3C2410_GPB(7),
S3C2410_GPB(8),
};

static unsigned int led_cfg_table [] = {
S3C2410_GPIO_OUTPUT,
S3C2410_GPIO_OUTPUT,
S3C2410_GPIO_OUTPUT,
S3C2410_GPIO_OUTPUT,
};

static int sbc2440_leds_ioctl(
struct file *file,
unsigned int cmd,
unsigned long arg)
{
switch(cmd) {
case 0:
case 1:
if (arg > 4) {
return -EINVAL;
}
gpio_set_value(led_table[arg], !cmd);
return 0;
default:
return -EINVAL;
}
}

static struct file_operations dev_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = sbc2440_leds_ioctl,
};

static struct miscdevice misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = DEVICE_NAME,
.fops = &dev_fops,
};

static int __init dev_init(void)
{
int ret;
int i;

for (i = 0; i < 4; i++) {
s3c_gpio_cfgpin(led_table[i], led_cfg_table[i]);
gpio_set_value(led_table[i], 0);
}
ret = misc_register(&misc);
printk (DEVICE_NAME"\tinitialized\n");

return ret;
}
static void __exit dev_exit(void)
{
misc_deregister(&misc);
}

module_init(dev_init);
module_exit(dev_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("FriendlyARM Inc.");