Mini6410 led驱动程序（混杂设备）

#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <asm/irq.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 <asm/uaccess.h>
#include <asm/atomic.h>
#include <asm/unistd.h>

#include <mach/map.h>
#include <mach/regs-clock.h>
#include <mach/regs-gpio.h>

#include <plat/gpio-cfg.h>
#include <mach/gpio-bank-e.h>
#include <mach/gpio-bank-k.h>

#define DEVICE_NAME "my_leds"

static long sbc2440_leds_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
        switch(cmd) {
                unsigned tmp;
        case 0:
        case 1:
                if (arg > 4) {
                        return -EINVAL;
                }
                tmp = readl(S3C64XX_GPKDAT);
                tmp &= ~(1 << (4 + arg));
                tmp |= ( (!cmd) << (4 + arg) );

writel(tmp, S3C64XX_GPKDAT);
                //printk (DEVICE_NAME": %d %d\n", 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;

        {
                unsigned tmp;
                tmp = readl(S3C64XX_GPKCON);
                tmp = (tmp & ~(0xffffU<<16))|(0x1111U<<16);
                writel(tmp, S3C64XX_GPKCON);

                tmp = readl(S3C64XX_GPKDAT);
                tmp |= (0xF << 4);
                writel(tmp, S3C64XX_GPKDAT);
        }

        ret = misc_register(&misc);

        printk (DEVICE_NAME"\tyinjiabin\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.");