s3c2410按键驱动完整版

/* 2410 中断按键驱动

*基于s3c2410的16个按键驱动，采用中断的方式，实现了阻塞和非阻塞，并用定时*器进行了消抖处理消抖，也实现的异步通知，POLL机制，每个源文件我都加了比较*详细的注释。各位刚刚学习ARM/Linux *驱动的同学可以参考。

*/

// button_irq_driver .c 驱动源文件

// button_irq_test.c 应用程序---按键测试（open可实现阻塞和非阻塞）

// button_poll_test.c 应用程序---poll机制按键测试

// button_fasync.c 应用程序---异步通知方式按键测试

/* button_irq_driver .c */

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

static unsigned int buttons_major = 0;

//本地结构体,表示一个按键

struct fsbuttons_cdev{

struct cdev *buttons_cdev; //按键设备结构体

struct class *buttons_class;//所属类

unsigned int key_buttons; //按键管脚电?1 /0

wait_queue_head_t buttons_wq;

struct timer_list button_timer;

};

static struct fsbuttons_cdev *fs_buttons ;

//构建一个结构体,用来描述中断管脚

struct fspin{

int irq;

int pin;

char *name;

int num;

int row_input;

int row_output;

int int_put;

int key_val;

};

static struct fspin fspin_desc[4]={

{IRQ_EINT0, S3C2410_GPF0, "row0", 0,

S3C2410_GPF0_INP, S3C2410_GPF0_OUTP, S3C2410_GPF0_EINT0},

{IRQ_EINT2, S3C2410_GPF2, "row1", 1,

S3C2410_GPF2_INP, S3C2410_GPF2_OUTP, S3C2410_GPF2_EINT2},

{IRQ_EINT11, S3C2410_GPG3, "row2", 2,

S3C2410_GPG3_INP, S3C2410_GPG3_OUTP, S3C2410_GPG3_EINT11}, {IRQ_EINT19, S3C2410_GPG11, "row3", 3,

S3C2410_GPG11_INP, S3C2410_GPG11_OUTP,

S3C2410_GPG11_EINT19},

};

struct pin_col {

int pin;

int col_input;

int col_output;

};

static struct pin_col col_line[4] = {

{S3C2410_GPE11, S3C2410_GPE11_INP, S3C2410_GPE11_OUTP}, {S3C2410_GPG6, S3C2410_GPG6_INP, S3C2410_GPG6_OUTP},

{S3C2410_GPE13, S3C2410_GPE13_INP, S3C2410_GPE13_OUTP}, {S3C2410_GPG2, S3C2410_GPG2_INP, S3C2410_GPG2_OUTP}, };

static int key_comfirm[4][4]={

{10,11,12,16},

{7,8,9,15},

{4,5,6,14},

{1,2,3,13},

};

/*构建异步通知注册函数用到的结构体*/

struct fasync_struct *fsbuttons_fasync;

struct fspin *cur_pin;

static void set_col_output(void)

{

int i;

for(i = 0;i<4;i++){

s3c2410_gpio_cfgpin(col_line[i].pin, col_line[i].col_output);

s3c2410_gpio_setpin(col_line[i].pin,0);

}

}

static void set_col_input(void)

{

int i;

for(i = 0;i<4;i++){

s3c2410_gpio_cfgpin(col_line[i].pin, col_line[i].col_input);

s3c2410_gpio_pullup(col_line[i].pin, 0);//上拉

}

}

//void (*function)(unsigned long);

static irqreturn_t button_timer_fun(unsigned long data)

{

int i;

unsigned int val_sec;

int row;

int col =-1;

if(!cur_pin)

return IRQ_NONE;

val_sec = s3c2410_gpio_getpin(cur_pin->pin);

if(val_sec != cur_pin->key_val)

return IRQ_NONE;

row = cur_pin->num;