输入子系统 OK6410按键驱动

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/*************************************************************************** Author : Deadline_h* Time   : 2017-3-4* Brief  : This is a input system driver of OK6410 based on the 3.0.1 kernel* 如果同样的事件，事件的值不变，只能上报一次。**************************************************************************/#include <linux/slab.h>#include <linux/module.h>#include <linux/fs.h>#include <linux/init.h>#include <linux/device.h>#include <linux/interrupt.h>#include <linux/workqueue.h>#include <linux/timer.h>#include <asm/io.h>#include <linux/input.h>static int irq_flag[6] = {0};  //用于判断，是否注册中断成功。struct timer_list my_timer;static unsigned timer_flag = 0;static struct input_dev * my_input_dev;#define GPM_CON 0x7F008820#define GPM_DAT 0x7F008824#define GPN_CON 0x7F008830#define GPN_DAT 0x7F008834#define EINT0FLTCON0 0x7F008910volatile unsigned long *gpfcon = NULL;volatile unsigned long *gpfdat = NULL;volatile unsigned long *gpncon = NULL;volatile unsigned long *gpndat = NULL;struct key_irq_dec{    unsigned int irq;    unsigned long flags;    const char * name;};static struct key_irq_dec key_irq[]={{IRQ_EINT(0),(IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING),"key1"},//key1 双边缘触发{IRQ_EINT(1),(IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING),"key2"},//key2{IRQ_EINT(2),(IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING),"key3"},//key3{IRQ_EINT(3),(IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING),"key4"},//key4{IRQ_EINT(4),(IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING),"key5"},//key5{IRQ_EINT(5),(IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING),"key6"},//key6};static  void my_timer_func(void){    unsigned int data = 0;    timer_flag = 0;    data = readl(gpndat);    if((data&(1<<0))==0)//key1    {        printk(KERN_WARNING"key 1 down\n");        input_event(my_input_dev,EV_KEY,KEY_0, 1); //上报事件    }    else    {        input_event(my_input_dev,EV_KEY,KEY_0, 0); //上报事件    }    /**************************************************************************/    if((data&(1<<1))==0)//key2    {        printk(KERN_WARNING"key 2 down\n");        input_event(my_input_dev,EV_KEY,KEY_1, 1); //上报事件    }    else    {        input_event(my_input_dev,EV_KEY,KEY_1, 0); //上报事件    }    /**************************************************************************/    if((data&(1<<2))==0)//key3    {        printk(KERN_WARNING"key 3 down\n");        input_event(my_input_dev,EV_KEY,KEY_L, 1); //上报事件    }    else    {        input_event(my_input_dev,EV_KEY,KEY_L, 0); //上报事件    }    /**************************************************************************/    if((data&(1<<3))==0)//key4    {        printk(KERN_WARNING"key 4 down\n");        input_event(my_input_dev,EV_KEY,KEY_S, 1); //上报事件    }    else    {        input_event(my_input_dev,EV_KEY,KEY_S, 0); //上报事件    }    /**************************************************************************/    if((data&(1<<4))==0)//key5    {        printk(KERN_WARNING"key 5 down\n");        input_event(my_input_dev,EV_KEY,KEY_LEFTSHIFT, 1); //上报事件    }    else    {        input_event(my_input_dev,EV_KEY,KEY_LEFTSHIFT, 0); //上报事件    }    /**************************************************************************/    if((data&(1<<5))==0)//key6    {        printk(KERN_WARNING"key 6 down\n");        input_event(my_input_dev,EV_KEY,KEY_ENTER, 1); //上报事件    }    else    {        input_event(my_input_dev,EV_KEY,KEY_ENTER, 0); //上报事件    }    /**************************************************************************/    input_sync(my_input_dev);//上报同步事件，表示上报结束}static irqreturn_t key_irq_handler(int irq, void * dev_id)//interrupt handler{//  printk(KERN_WARNING"irq = %d , dev = %d\n",irq,dev_id);    if(timer_flag == 0)        mod_timer(&my_timer, jiffies + (1 * HZ) / 10);//启动定时器 定时器 100ms    timer_flag = 1;    return 0;  //中断处理函数要有返回值，不然内核会打印一些错误信息。}void key_hw_init(void)  //配置IO口为中断模式{    unsigned int data;    gpncon= ioremap(GPN_CON,4);    gpndat= ioremap(GPN_DAT,4);    data = readl(gpncon);    data &= ~((0b11<<0)|(0b11<<2)|(0b11<<4)|(0b11<<6)|(0b11<<8)|(0b11<<10));  //设置按键1与按键6    data |= ((0b10<<0)|(0b10<<2)|(0b10<<4)|(0b10<<6)|(0b10<<8)|(0b10<<10));   //设置按键1与按键6    writel(data,gpncon);}static int dri_init(void){    unsigned int i = 0;    unsigned int irq_retval = 0;    key_hw_init();//将按键引脚配置为中断模式    printk(KERN_WARNING "my input sys device register\n");    my_input_dev = input_allocate_device();       //分配一个input_dev结构体    set_bit(EV_KEY, my_input_dev->evbit);         //设置能产生什么类型的事件    //set_bit(EV_REP, my_input_dev->evbit);         //设置能产生什么类型的事件    set_bit(KEY_0,         my_input_dev->keybit); //设置能产生什么事件    set_bit(KEY_1,         my_input_dev->keybit);    set_bit(KEY_L,         my_input_dev->keybit);    set_bit(KEY_S,         my_input_dev->keybit);    set_bit(KEY_LEFTSHIFT, my_input_dev->keybit);    set_bit(KEY_ENTER,     my_input_dev->keybit);    input_register_device(my_input_dev); //注册input_dev    init_timer(&my_timer);                       //初始化定时器    my_timer.function = (void *)my_timer_func;    add_timer(&my_timer);                        //添加定时器    for(i=0;i<6;i++)//如果中断注册不成功，可能是因为该中断号已经注册过了，需要配置内核。或者设置成共享中断    {        irq_retval =    request_irq(key_irq[i].irq,key_irq_handler,key_irq[i].flags,key_irq[i].name,0); //注册中断        if(irq_retval == 0)        {            irq_flag[i] = 0;            //printk(KERN_WARNING"irq_%d request succeed\n",i);        }        else        {            irq_flag[i] = -1;            printk(KERN_WARNING"irq_%d request failded,return val %d\n",i,irq_retval);        }    }    return 0;}static void dri_exit(void){    unsigned int i = 0;    printk(KERN_WARNING "module delete\n");    for(i=0;i<6;i++)    {        if(irq_flag[i] == 0)  //注册成功的中断才注销中断            free_irq(key_irq[i].irq,0); //注销中断    }    del_timer(&my_timer); //删除定时器    input_unregister_device(my_input_dev); //注销input_dev    input_free_device(my_input_dev); //释放input_dev的内存}module_init(dri_init);module_exit(dri_exit);MODULE_LICENSE("GPL");MODULE_AUTHOR("Deadline_h");MODULE_VERSION("V1.0");

应用测试程序：

#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <sys/ioctl.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <sys/select.h>#include <sys/time.h>#include <errno.h>#include <linux/input.h>int main(void){    int fd;    int key_value,i=0;    struct input_event ev_key;    fd = open("/dev/event2", O_RDWR);    if (fd < 0) {        printf("open failed\n");        exit(1);    }    while(1)    {        read(fd,&ev_key,sizeof(struct input_event));        if(EV_KEY==ev_key.type)            printf("type:%d,code:%d,value:%d\n", ev_key.type,ev_key.code,ev_key.value);        if(EV_SYN==ev_key.type)            printf("syn event\n\n");    }    close(fd);    return 0;}

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