周立功IMX287开发套件之按键中断（linux 驱动按键中断）

 昨天弄完数码管驱动，也没别的事儿做，单位通知到15号还是在家办公，那就接着鼓动这块落灰板子吧。

忘说了，周立功这块拓展版datesheet有问题，引脚对应关系完全不对。得用万用表测量出引脚。接线短接见下图：

 

驱动代码直接贴出来了，代码注释的地方懒得补齐了，没写应用层代码实现，直接按键内核打印按下键值，如图：

#include
#include
#include                                                  
#include                                                 
#include"mach/../../mx28_pins.h"
#include 
#include "mach/mx28.h"
#include
#include 
#include                                     
#include                          
#include                          
#include                   
#include              
#include

#include 
#include 
#include 
#include 
#include 
#include 


#define CHR_NAME "AP-283Demo-key"
#define CLS_NAME "AP-283Demo-gpio"
#define DEV_NAME "keys_int"



struct dev_keys{
    dev_t devid;            //设备号 
    int major_num;          //主设备号 
    int minor_num;          //次设备号 

    struct cdev   cdev;    //cdev 
    struct class *class;    //类 
    struct device *device;  //设备 
};


struct gpio_info {
	u32  	 	   pin;
	char 	 	   pin_name[20];
	irqreturn_t           (*func)(int irq,void *dev_id);
};

struct dev_keys keys;

static irqreturn_t key_1_handler(int irq,void *dev_id);
static irqreturn_t key_2_handler(int irq,void *dev_id);
static irqreturn_t key_3_handler(int irq,void *dev_id);
static irqreturn_t key_4_handler(int irq,void *dev_id);
static irqreturn_t key_5_handler(int irq,void *dev_id);

static struct gpio_info key[] ={
   	    {PINID_SAIF0_BITCLK,   "gpio-KEY1" , key_1_handler},
        {PINID_SAIF0_SDATA0,   "gpio-KEY2" , key_2_handler},
        {PINID_SSP1_DATA0,     "gpio-KEY3" , key_3_handler},
        {PINID_SSP1_SCK,       "gpio-KEY3" , key_4_handler},
        {PINID_SSP1_CMD,       "gpio-KEY4" , key_5_handler},
        {0,                          "",           NULL},  //the end
};

static int keys_open(struct inode *inode, struct file *file);
static int keys_release(struct inode *inode, struct file *file);
static long keys_ioctl(struct file *file, unsigned int cmd, unsigned long arg);

static struct file_operations keys_fops = {
	.owner = THIS_MODULE,
	.open  = keys_open,
	.release = keys_release,
	.unlocked_ioctl = keys_ioctl,
};




static irqreturn_t key_1_handler(int irq,void *dev_id)
{
	printk("key1\n");
	
	return IRQ_RETVAL(IRQ_HANDLED);
}
 
static irqreturn_t key_2_handler(int irq,void *dev_id)
{
	printk("key2\n");
	
	return IRQ_RETVAL(IRQ_HANDLED);
}
 
static irqreturn_t key_3_handler(int irq,void *dev_id)
{
	printk("key3\n");
	
	return IRQ_RETVAL(IRQ_HANDLED);
}

static irqreturn_t key_4_handler(int irq,void *dev_id)
{
	printk("key4\n");
	
	return IRQ_RETVAL(IRQ_HANDLED);
}


static irqreturn_t key_5_handler(int irq,void *dev_id)
{
	printk("key5\n");
	
	return IRQ_RETVAL(IRQ_HANDLED);
}

 


static int keys_open(struct inode *inode, struct file *file)
{/*
	int i;
	printk("pocky330_open \n");
	for(i=0;i<4;i++)
	{
		gpio_request(gpios[i],"gpio");
		s3c_gpio_cfgpin(gpios[i],S3C_GPIO_INPUT);
		s3c_gpio_setpull(gpios[i],S3C_GPIO_PULL_NONE);
	}
	*/
	return 0;
}
 
static int keys_release(struct inode *inode, struct file *file)
{/*
	int i;
	printk("pocky330_release \n");
	for(i=0;i<4;i++)
	{
		gpio_free(gpios[i]);
	}
    */
	return 0;
}
 
static long keys_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{	
    /*
	if(cmd == 3)
	{
		return gpio_get_value(gpios[2]);
	}
	else if(cmd == 4)
	{
		return gpio_get_value(gpios[3]);
	}
	else
	{
		printk(KERN_EMERG "cmd err!! \n");
	}
    */
	return 0;
}
 
static int gpio_keys_init(void)
{
    int irq_no;
	int iRet;
    int i;

    printk("keys_gpio_init!!! \n");
    for(i=0;key[i].pin != 0;i++){
        gpio_free(MXS_PIN_TO_GPIO(key[i].pin));
        iRet = gpio_request(MXS_PIN_TO_GPIO(key[i].pin), key[i].pin_name);
        if (iRet != 0) {
            printk("request %s failed \n",key[i].pin_name);
            return -EBUSY;
        }
        gpio_direction_input(MXS_PIN_TO_GPIO(key[i].pin));
	    irq_no  = gpio_to_irq(MXS_PIN_TO_GPIO(key[i].pin));
       // printk("%s request irq _num [%d]  success \n",key[i].pin_name,irq_no);
	    set_irq_type(irq_no, IRQF_TRIGGER_FALLING);	//下降沿中断

        iRet = request_irq(irq_no, key[i].func, IRQF_DISABLED, key[i].pin_name, NULL);
	    if (iRet != 0){
		    printk("request irq failed!! ret: %d  irq:%d gpio:%d  \n", iRet, irq_no,MXS_PIN_TO_GPIO(key[i].pin));
		    return -EBUSY;
	    }
        printk("request irq success!! ret: %d  irq:%d gpio:%d  \n", iRet, irq_no,MXS_PIN_TO_GPIO(key[i].pin));
    }
		

	printk("Initialize all keys gpio success \n");
	return 0;
}


static int __init keys_init(viod)
{
	int ret;
    dev_t devno;

	printk("keys_mod_init!!! \n");
	ret = alloc_chrdev_region(&devno,keys.minor_num,1,CHR_NAME);
    keys.major_num = MAJOR(devno);
	if(ret < 0){
		printk("alloc_chrdev_region fail!!! \n");
        return ret;
	}else{
		printk("keys register success dev-number[%d]\n",keys.major_num);
	}

	cdev_init(&keys.cdev,&keys_fops);
	ret = cdev_add(&keys.cdev, devno, 1);
	if(ret<0){
		printk("add device failure\n"); 
	}

	keys.class = class_create(THIS_MODULE,CLS_NAME);
	keys.device = device_create(keys.class,NULL,MKDEV(keys.major_num, 0),NULL,DEV_NAME);

    ret = gpio_keys_init();

	return 0;
}
 
static void keys_exit(void)
{
	dev_t devno = MKDEV(keys.major_num, keys.minor_num); 	
	cdev_del(&keys.cdev);
	device_unregister(keys.device);
	class_destroy(keys.class);
	unregister_chrdev_region(devno,1);
    //free_irq(IRQ_EINT(9),NULL);
    //free_irq(IRQ_EINT(10),NULL);
    printk("keys_int unregister success\n");
}


module_init(keys_init);
module_exit(keys_exit);
MODULE_AUTHOR("Rambo.zhang");