/*按鍵驅(qū)動(dòng)* date:Dec.02,2008* author: daihj07@thu* v1.0*/#include <linux/module.h>#include <linux/kernel.h>#include <linux/fs.h>#include <linux/init.h>#include <linux/delay.h>#include <asm/irq.h>#include <linux/interrupt.h>#include <asm/uaccess.h>#include <asm/arch/regs-gpio.h>#include <asm/hardware.h>#include <asm/io.h>	//for ioremap#include <linux/delay.h>#define DEVICE_NAME     "buttons"   /* 加載模式后，執(zhí)行”cat /proc/devices”命令看到的設(shè)備名稱 */#define BUTTON_MAJOR    232         /* 主設(shè)備號(hào) */struct button_irq_desc {    int irq;    unsigned long flags;    char *name;};/* 用來(lái)指定按鍵所用的外部中斷引腳及中斷觸發(fā)方式, 名字 */static struct button_irq_desc button_irqs [] = {    {IRQ_EINT1, IRQF_TRIGGER_FALLING, "KEYINT1"}, /* K1 */    {IRQ_EINT2, IRQF_TRIGGER_FALLING, "KEYINT2"}, /* K2 */    {IRQ_EINT3,  IRQF_TRIGGER_FALLING, "KEYINT3"}, /* K3 */    {IRQ_EINT4,  IRQF_TRIGGER_FALLING, "KEYINT4"}, /* K4 */    {IRQ_EINT5,  IRQF_TRIGGER_FALLING, "KEYINT5"}, /* K5 */};/* 用來(lái)指定key 所用的GPIO引腳 */static unsigned long key_output_table [] = {    S3C2410_GPB6,    S3C2410_GPB7,    S3C2410_GPB8,    S3C2410_GPB9,    S3C2410_GPB10,};/* 用來(lái)指定GPIO引腳的功能：輸出 */static unsigned int key_output_cfg_table [] = {    S3C2410_GPB6_OUTP,    S3C2410_GPB7_OUTP,    S3C2410_GPB8_OUTP,    S3C2410_GPB9_OUTP,    S3C2410_GPB10_OUTP,};static unsigned long key_input_table [] = {	S3C2410_GPF1,	S3C2410_GPF2,	S3C2410_GPF3,	S3C2410_GPF4,	S3C2410_GPF5,};/* 按鍵被按下的次數(shù)(準(zhǔn)確地說(shuō)，是發(fā)生中斷的次數(shù)) */static volatile int press_cnt [] = {0, 0, 0, 0, 0};/* 等待隊(duì)列:  * 當(dāng)沒有按鍵被按下時(shí)，如果有進(jìn)程調(diào)用s3c24xx_buttons_read函數(shù)， * 它將休眠 */static DECLARE_WAIT_QUEUE_HEAD(button_waitq);/* 中斷事件標(biāo)志, 中斷服務(wù)程序?qū)⑺?，s3c24xx_buttons_read將它清0 */static volatile int ev_press = 0;/* GPB6-10 output, low*	GPF1-5, interrupt,  上拉 */static int s3c24xx_key_iocfg(void){    int i;    for (i = 0; i < sizeof(key_output_table)/sizeof(key_output_table[0]);i++) {        // 設(shè)置GPIO引腳的功能：本驅(qū)動(dòng)中GPB6-10 引腳設(shè)為輸出功能,low        s3c2410_gpio_cfgpin(key_output_table[i], key_output_cfg_table[i]);		s3c2410_gpio_setpin(key_output_table[i], 0);	//	output low    }	/*		rGPFCON = (rGPFCON & ~(0x3ff<<2)) | (0x2aa<<2); 	//GPF 1-5 EINT	rGPFUP = rGPFUP&(~(0x1f<<1));	rEXTINT0 = (rEXTINT0& ~(0xfffff<<4)) | (0x00000<<4); 	//EXTINT 1-5 low level triggered	先只確定內(nèi)部上拉；	*/	for(i = 0;  i < sizeof(key_input_table)/sizeof(key_input_table[0]);i++) {		s3c2410_gpio_pullup(key_input_table[i], 0);		}    return 0;}/******************************************************************************5*5 鍵盤五個(gè)輸入引腳: GPF5 EINT5	EINT5/GPF5  按鍵	CN1-91	EINTGPF4 EINT4	EINT4/GPF4  按鍵	CN1-90	EINTGPF3 EINT3	EINT3/GPF3  按鍵	CN1-89	EINTGPF2 EINT2	EINT2/GPF2  按鍵	CN1-88	EINTGPF1 EINT1	EINT1/GPF1 按鍵	CN1-87	EINTGPB10 nXDREQ0	GPB10	CN2-91	按鍵GPB9 nXDACK0	GPB9	CN2-90	按鍵GPB8 nXDREQ1	GPB8:LED4:LDMD3:KEY8	CN2-89	按鍵 輸出GPB7 nXDACK1	GPB7:LED3:LDMD2:KEY7	CN2-88	按鍵 輸出GPB6 nXBREQ	GPB6:LED2:LDMD1:KEY6	CN2-87	按鍵 輸出GPB5 nXBACK	GPB5:LED1:LCM_D0	CN2-86	******************************************************************************/#if 0static int  T3h_key_Scan( int irq ){	int i;	int dat;	int j;	int nirq;	unsigned long GPBDAT,GPFDAT,GPFCON;	nirq=sizeof(button_irqs)/sizeof(button_irqs[0]);	printk("key scan started!,nirq= %d",nirq);/*讀取GPFCON寄存器的值*#define rGPFCON    (*(volatile unsigned *)0x56000050)	//Port F control*/	GPBDAT=(unsigned long)ioremap(0x56000014,4);	GPFDAT=(unsigned long)ioremap(0x56000054,4);	GPFCON=(unsigned long)ioremap(0x56000050,4);	printk("GPFCON = %x",GPFCON);	printk("irq=%d in key scan", irq);//	delay(900);		for(j=0;j<nirq;j++){			if(irq==button_irqs[j].irq){				for(i=0;i<ncol;i++){					(*(volatile unsigned long *)GPBDAT) = ((*(volatile unsigned long *)GPBDAT) & ~(0x1f<<6)) | (~((1<<i)& 0x1f)<<6);  // GPB 6-10	clear first and set, low to ready, clear the corresponding bit, set others					dat= (*(volatile unsigned long *)GPFDAT)>>1;					if(((dat>>j)&1)==0){						printk("row=%d,	col=%d\n",i,j);						return i+1;						}					}				}			}	return -1;}#endifstatic int  T3h_key_Scan( int irq ){	int i;	int dat;	int j;	int nirq,ncol;	int ret=-1;	nirq=sizeof(button_irqs)/sizeof(button_irqs[0]);	ncol=sizeof(key_output_table)/sizeof(key_output_table[0]);//	printk("key scan started!,nirq= %d, ncol= %d,irq=%d in key scan\n", nirq ,ncol,irq);	for(i=0;i<ncol;i++){		s3c2410_gpio_setpin(key_output_table[i], 1);	//	output high		}	for(j=0;j<nirq;j++){		if(irq==button_irqs[j].irq){			for(i=0;i<ncol;i++){				s3c2410_gpio_setpin(key_output_table[i], 0);	//	output low				dat= s3c2410_gpio_getpin(key_input_table[j]);				if(dat==0){//					printk("row(j)=%d,	col(i)=%d\n",j,i);					ret= i+1;					break;					}				s3c2410_gpio_setpin(key_output_table[i], 1);	//	output high				}						break;			}		}	for(i=0;i<ncol;i++){	s3c2410_gpio_setpin(key_output_table[i], 0);	//	output low	}	return ret;}static irqreturn_t buttons_interrupt(int irq, void *dev_id){    volatile int *press_cnt = (volatile int *)dev_id;	//device_id 如何傳遞的澹