#include <linux/miscdevice.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/rcupdate.h>
#include <linux/platform_device.h>
#include <linux/cdev.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/completion.h>
#include <asm/io.h>
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <asm/uaccess.h>
#include <linux/gpio.h>
#include <gsc3280/gpio.h>
#include <gsc3280/sysctl.h>
#include <linux/time.h>
#include <linux/ioctl.h>

#define MEMDEV_IOC_MAGIC	'y'
#define IOCTRL_GPIO_IN			_IO(MEMDEV_IOC_MAGIC,1)
#define IOCTRL_GPIO_OUT			_IO(MEMDEV_IOC_MAGIC,2)
#define IOCTRL_GPIO_REQ			_IO(MEMDEV_IOC_MAGIC,3)
#define IOCTRL_GPIO_FRE			_IO(MEMDEV_IOC_MAGIC,4)



#define SYS_MOD_CTL0	0xBC04A008
#define GPIO_EN			(1<<27)
#define SYS_IOMUX_CFG0	0xBC04A0B0

#define GPIO_BASE		0xBC110000

#define GPIO_SWPORTA_DR  (0x0 +  GPIO_BASE)
#define GPIO_SWPORTA_DDR (0x04 + GPIO_BASE)

#define GPIO_SWPORTB_DR  (0x0c + GPIO_BASE)
#define GPIO_SWPORTB_DDR (0x10 + GPIO_BASE)

#define GPIO_SWPORTC_DR  (0x18 + GPIO_BASE)
#define GPIO_SWPORTC_DDR (0x1C + GPIO_BASE)

struct gsc3280_gpio{
	short int pin;
	short int data;
};

static int special_gpio_open(struct inode *inode, struct file *file) {

	return 0;
}

static int special_gpio_close(struct inode *inode, struct file *file){
	return 0;
}

static ssize_t special_gpio_read(struct file *file, char __user *buf, size_t count, loff_t *ptr){
	return 0;
}

static ssize_t special_gpio_write(struct file *filp, const char __user *buf, size_t count, loff_t *ptr){
	return 0;
}

static long special_gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg){
	struct gsc3280_gpio *dev ;
	dev = (struct gsc3280_gpio *)arg;
	*(volatile unsigned int*)SYS_MOD_CTL0 |= GPIO_EN;
	switch(cmd){
		case IOCTRL_GPIO_REQ:
			if((dev->pin > 0 || 0 == dev->pin ) && dev->pin <88 ){
				gpio_request(dev->pin,NULL);
			}
			break;
		case IOCTRL_GPIO_OUT:
			if((dev->pin > 0 || 0 == dev->pin ) && dev->pin <88 )
			{
				if(dev->data > 0)
					gpio_direction_output(dev->pin,1);
				else
					gpio_direction_output(dev->pin,0);
			}
			break;
		case IOCTRL_GPIO_IN:
			if((dev->pin > 0 || 0 == dev->pin ) && dev->pin <88 )
			{
				gpio_direction_input(dev->pin);
				dev->data=gpio_get_value(dev->pin);
			}
			break;
		case IOCTRL_GPIO_FRE:
			if((dev->pin > 0 || 0 == dev->pin ) && dev->pin <88 ){
				gpio_free(dev->pin);
			}
			break;	
		default:
			printk(KERN_INFO"cmd error!!!\n");
			break;

	}
	return 0;
}

static const struct file_operations special_gpio_ops = {
		.owner = THIS_MODULE,
		.open = special_gpio_open,
		.read = special_gpio_read,
		.write = special_gpio_write,
		.release = special_gpio_close,
		.unlocked_ioctl = special_gpio_ioctl,
};

static struct miscdevice special_gpio_miscdev = {
		.minor = MISC_DYNAMIC_MINOR,
		.name  = "3280_GPIO",
		.fops  = &special_gpio_ops,
};

static int special_gpio_init(void){
	printk(KERN_INFO"%s\n",__func__);
	if (misc_register(&special_gpio_miscdev)){
	  printk(KERN_ALERT"Couldn't register device 0, %d.\n", 255);
	  return -EBUSY;
	}
	return 0;
}

static void special_gpio_exit(void){
	printk(KERN_INFO"%s\n",__func__);
	misc_deregister(&special_gpio_miscdev);
}

module_init(special_gpio_init);
module_exit(special_gpio_exit);
MODULE_LICENSE("GPL");