/*wiegand?協議驅動代碼*/
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?

#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?

#include?
#include?

#define?WIEGAND_MAJOR?243????????

//delay?33ms?to?convert?data
#define?TIMER_DELAY?HZ/30

#define?DEVICE_NAME?“wiegand“?
?
bool?TIMEER_FLAG?=?false;???
bool?RF_OPEN_FLAG?=?false;

struct?wiegand_dev
{
	char?wiegand[26];????//Wiegand?Data?26Bits
	int?hid;
	int?pid;
	//unsigned?char?state;?
	int?count;????//Global?Counter
	struct?cdev?cdev;
	struct?semaphore?sem;
	struct?completion?receive_completion;
	struct?timer_list?wiegand_timer;
};

static?struct?wiegand_dev?*rf_card;

//應該除了初始化外，只能有這一個地方能夠將rf_card->count置為0，其余地方置為0皆不合法
static?char?convert_data（void）
{
	int?ievenodd;

	//奇校驗
????	even?=?0;
????	for（i?=?1;?i?????	{
	?	if（rf_card->wiegand[i]?==?1）	
	??	even?=?（~even）?&?0x01;?
????	}
?????	if（even?!=?rf_card->wiegand[0]）
?????	?{
		rf_card->count?=?0;
		goto?error;
??????	}	
	//偶校驗??
???	?odd?=?1;
????	for（i?=?13;?i????	{
	????if（rf_card->wiegand[i]?==?1）			?
			odd?=?（~odd）&?0x01;	??????
?????	}
?????	if（odd?!=?rf_card->wiegand[25]）
??????	{
		rf_card->count?=?0;
	???????goto?error;
?????	?}

	//奇偶校驗通過
	rf_card->hid?=?0;
	for（i?=?1?;i<=12;i++）//hid轉換
		rf_card->hid?=??rf_card->hid?<wiegand[i];	

	rf_card->pid?=?0;
	for（i?=?13?;i<=25;i++）//pid轉換
		rf_card->pid?=??rf_card->pid?<wiegand[i];	
	??
????	rf_card->count?=?0;
	return?0;
	
error:
	printk（“Parity?Efficacy?Error!\n“）;
	return?-1;
}

static?void?wiegand_do_timer（unsigned?long?arg）
{
	printk（“%s:wait?wieg_data?completed\n“__func__）;
	wait_for_completion（&（rf_card->receive_completion））;//等待維根數據傳送完畢才進行轉換

	disable_irq（IRQ_EINT（17））;
	disable_irq（IRQ_EINT（18））;//防止wieg_data在轉換期間發生變化

	convert_data（）;
	up（&rf_card->sem）;

	printk（“%s:complete?convert?wieg_datahid?=?%dpid?=?%d?\n“__func__rf_card->hidrf_card->pid）;

	TIMEER_FLAG?=?false;

	enable_irq（IRQ_EINT（17））;
	enable_irq（IRQ_EINT（18））;
}

static?void?enable_irqs（void）
{	
	enable_irq（IRQ_EINT（17））;
	enable_irq（IRQ_EINT（18））;

	printk（“%s:the?irq?is?setup!\n“__func__）;
}

static?irqreturn_t?wiegand_irq0（int?irq?void?*dev_id）
{
	disable_irq_nosync（IRQ_EINT（17））;
?	printk（“%s:IN\n“__func__）;??
	udelay（5）;

	if（gpio_get_value（S3C64XX_GPL（9））?==?0）
	{
???		rf_card->wiegand[rf_card->count]?=?0;
???		printk（“%s:wiegand[%d]?=?%d\n“__func__rf_card->countrf_card->wiegand[rf_card->count]）;
		rf_card->count?++;
		udelay（300）;
	}?
	else?
		goto?end;

	enable_irq（IRQ_EINT（17））;

	if（rf_card->count?==?1）
		init_completion（&（rf_card->receive_completion））;
	else?i