#include "usb_gpio.h"

static struct gpio_chip ft232_chip;
static struct subprocess_info *sub_info;
static struct semaphore read_sema;

static char pin_status[1];
static int major;
static uint8_t buff_empty=1;
static uint8_t buff_start;
static uint8_t buff_end;

static uint8_t buffer[BUFFER_SIZE];


#include "char_dev.c"
#include "gpio_callbacks.c"

static void usb_gpio_exit(void) {
	if( gpiochip_remove(&ft232_chip)<0 ){
		printk("<1>%s: Couldn't free GPIO-pins!\n",MOD_NAME);
	}
	unregister_chrdev(major, MOD_NAME);
	printk("<1>%s: Bye!\n",MOD_NAME);
}

static int usb_gpio_init(void) {
	int ret;
	// Prepare user space handler call
	char *argv[] = { "/usr/bin/usb_gpio_ftdi_helper", NULL };
	static char *envp[] = {
		"HOME=/",
		"TERM=linux",
		"PATH=/sbin:/bin:/usr/sbin:/usr/bin", NULL };

	printk("<1>%s: Loading... \n",MOD_NAME);
	
	major = register_chrdev(0, MOD_NAME, &fops);
	if(major<0){
		printk("<1>%s: Can't register character device!\n",MOD_NAME);
	}
	printk("<1>%s: Assigned device major #%d minor #0!\n",MOD_NAME,major);
	printk("<1>%s: Create device file with: \"mknod /dev/usb_gpio c %d 0\"\n",MOD_NAME,major);

	sema_init(&read_sema,0);

	//GPIO registration
	ft232_chip.label = MOD_NAME;

	//Callback functions
	ft232_chip.direction_input = set_in;
	ft232_chip.direction_output = set_out;
	ft232_chip.get = get_value;
	ft232_chip.set = set_value;

	//Automaticaly choose GPIO numbers - manual seems not to be possible
	ft232_chip.base = -1; 
	//Number of GPIO pins
	ft232_chip.ngpio = NUM_OF_GPIO;
	 //This indicates that get and set functions can sleep
	ft232_chip.can_sleep = 1;
	ft232_chip.owner = THIS_MODULE;

	ret = gpiochip_add(&ft232_chip);
	DEBUG_OUT("<1>%s: gpiochip_add returned %d\n",MOD_NAME,ret);
	if (ret){
		printk("<1>%s: Can't register chip!\n",MOD_NAME);
	}
	return ret;
    //Call the user space handler
    /*sub_info = call_usermodehelper_setup( argv[0], argv, envp, GFP_ATOMIC );
    if (sub_info == NULL){
	    return -ENOMEM;
    }

    // the helper will run in the background until the module decides to kill it
    ret=call_usermodehelper_exec( sub_info, UMH_NO_WAIT );
	if(ret<0){
		printk("<1>%s: Couldn't run userspace helper process (%s)!\n",MOD_NAME,);
	}*/
}

module_init(usb_gpio_init);
module_exit(usb_gpio_exit);
MODULE_LICENSE("Dual BSD/GPL");