MINI6410 input类型按键驱动

 

交叉编译是arm-linux-gcc 4.4.1 内核是linux-2.6.28.6

 

#include
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#include
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#include

#include

MODULE_AUTHOR("HaNdAEr");
MODULE_LICENSE("GPL");

 

struct input_dev* button_devp;
static char *name = "s3c6410_buttons";

struct button_irq_desc{
 int irq;
 //int pin;
 int number;
 char *name;
};

static struct button_irq_desc button_irqs[] = {
 { IRQ_EINT(0),  /*S3C64XX_GPN(0), */  0,  "KEY1"},
 { IRQ_EINT(1),  /*S3C64XX_GPN(1), */  1,  "KEY2"},
 { IRQ_EINT(2),  /*S3C64XX_GPN(2), */  2,  "KEY3"},
 { IRQ_EINT(3),  /*S3C64XX_GPN(3), */  3,  "KEY4"},
 { IRQ_EINT(4),  /*S3C64XX_GPN(4), */  4,  "KEY5"},
 { IRQ_EINT(5),  /*S3C64XX_GPN(5), */  5,  "KEY6"},
 { IRQ_EINT(19), /*S3C64XX_GPL(11),*/  11, "KEY7"},
 { IRQ_EINT(20), /*S3C64XX_GPL(12),*/  12, "KEY8"},
};

static irqreturn_t  button_interrupt(int irq, void* dev_id)
{

 struct button_irq_desc *button_irqs = (struct button_irq_desc*)dev_id;
 int updown,reportval;
 if(button_irqs->number <0){
  return -1;
 }

 if(button_irqs->number <=5){
  updown = readl(S3C64XX_GPNDAT) & ( 0x1 << button_irqs->number);
 }

if(button_irqs->number == 11 || button_irqs->number == 12){
  updown = readl(S3C64XX_GPLDAT) & ( 0x1 << button_irqs->number);
 }

 reportval = updown ? 0 : 1;

 switch(button_irqs->number)
 {
  case IRQ_EINT(0):
   input_report_key(button_devp, BTN_0, reportval);
   break;
  case IRQ_EINT(1):
   input_report_key(button_devp, BTN_1, reportval);
   break;
  case IRQ_EINT(2):
   input_report_key(button_devp, BTN_2, reportval);
   break;
  case IRQ_EINT(3):
   input_report_key(button_devp, BTN_3, reportval);
   break;
  case IRQ_EINT(4):
   input_report_key(button_devp, BTN_4, reportval);
   break;
  case IRQ_EINT(5):
   input_report_key(button_devp, BTN_5, reportval);
   break;
  case IRQ_EINT(19):
   input_report_key(button_devp, BTN_6, reportval);
   break;
  case IRQ_EINT(20):
   input_report_key(button_devp, BTN_7, reportval);
   break;
  default:
   break;
 }   
 input_sync(button_devp);
 return IRQ_RETVAL(IRQ_HANDLED);

}

static int __init button_init(void)
{
 int i;
 int err = 0;
 int ret = 0;

 struct input_dev *input_dev;

 input_dev = input_allocate_device();
 if(!input_dev){
  printk(KERN_ERR"Unable to alloc the input device!!\n");
 }

 button_devp = input_dev;

/* 

button_devp->evbit[0] = BIT(EV_KEY) | BIT(EV_SYN);
 button_devp->keybit[BIT_WORD(BTN_0)] = BIT_MASK(BTN_0) | BIT_MASK(BTN_1) | BIT_MASK(BTN_2) |
  BIT_MASK(BTN_3) | BIT_MASK(BTN_4) | BIT_MASK(BTN_5) | BIT_MASK(BTN_6) | BIT_MASK(BTN_7);

*/

 button_devp->name = name;
 for(i = 0; i < sizeof(button_irqs)/sizeof(button_irqs[0]); i++)
 {
  err = request_irq(button_irqs[i].irq, button_interrupt, IRQ_TYPE_EDGE_BOTH, button_irqs[i].name, (void *)&button_irqs[i]);
  if(err)
  {
   break;
  }
 }

 if(err)
 {
  i--;
  for(; i >= 0; i--)
  {
   if(button_irqs[i].irq < 0)
   {
    continue;
   }
   disable_irq(button_irqs[i].irq);
   free_irq(button_irqs[i].irq, (void*)&button_irqs[i]);
  }
  return -EBUSY;
 }
 

 set_bit(EV_KEY, button_devp->evbit);
 set_bit(BTN_0,  button_devp->keybit);
 set_bit(BTN_1,  button_devp->keybit);
 set_bit(BTN_2,  button_devp->keybit);
 set_bit(BTN_3,  button_devp->keybit);
 set_bit(BTN_4,  button_devp->keybit);
 set_bit(BTN_5,  button_devp->keybit);
 set_bit(BTN_6,  button_devp->keybit);
 set_bit(BTN_7,  button_devp->keybit);
 ret = input_register_device(button_devp);
 
 if(ret < 0){
  printk("input_register_device(): failed !! \n");
 }

 return ret;
}

static void __exit button_exit(void)
{
 int i;
 for(i = 0; i < sizeof(button_irqs)/sizeof(button_irqs[0]); i++)
 {
  disable_irq(button_irqs[i].irq);
  free_irq(button_irqs[i].irq, (void*)&button_irqs[i]);
 }
 input_unregister_device(button_devp);
}

module_init(button_init);
module_exit(button_exit);

 

 

 

 

 

 

测试函数：

 

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

int main(void)
{
 struct input_event ievent;
 int fd = open("/dev/input/event1",O_RDWR );
 if(fd < 0){
  printf("Unable open /dev/input/event0\n");
  return -1;
 }
 while(1){
  if(read(fd, &ievent, sizeof(struct input_event)) < 0);
  return -1;
  if(ievent.type == EV_KEY){
   switch(ievent.code){
    case BTN_0:
     ievent.value ? printf("key1 is pressed!\n"):printf("key1 is released!!\n");
     break;
    case BTN_1:
     ievent.value ? printf("key2 is pressed!\n"):printf("key2 is released!!\n");
     break;
    case BTN_2:
     ievent.value ? printf("key3 is pressed!\n"):printf("key3 is released!!\n");
     break;
    case BTN_3:
     ievent.value ? printf("key4 is pressed!\n"):printf("key4 is released!!\n");
     break;
    case BTN_4:
     ievent.value ? printf("key5 is pressed!\n"):printf("key5 is released!!\n");
     break;
    case BTN_5:
     ievent.value ? printf("key6 is pressed!\n"):printf("key6 is released!!\n");
     break;
    case BTN_6:
     ievent.value ? printf("key7 is pressed!\n"):printf("key7 is released!!\n");
     break;
    case BTN_7:
     ievent.value ? printf("key8 is pressed!\n"):printf("key8 is released!!\n");
     break;
   }
  }
 }
 close(fd);
 return 0;
}