Mini6410 led驱动程序（混杂设备）

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#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.");