[font=新宋体][size=2]请问这个驱动什么地方有问题？编写了一个测试程序运行后，按开发板的按键没有任何反应？？望高手们指点！！
驱动程序：
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <asm/irq.h>
#include <mach/regs-gpio.h>
#include <mach/hardware.h>
#define DEVICE_NAME "my2440_buttons"
#define DEVICE_MAJOR 232
#define KEY_TIMER_DELAY1 (HZ/100)
#define KEY_TIMER_DELAY2 (HZ/10)
#define KEY_DOWN 0 //按键按下
#define KEY_UP 1 //按键抬起
#define KEY_UNCERTAIN 2 //按键不确定
#define KEY_COUNT 6 //6个按键
static volatile int ev_press = 0; //中断产生标志
static volatile int key_status[KEY_COUNT]; //6个按键状态
struct timer_list key_timers[KEY_COUNT]; //6个按键去抖定时器
static DECLARE_WAIT_QUEUE_HEAD(button_waitq); //定义并初始化等待队列
struct button_irq_desc //硬件资源键值结构体
{
int irq;
int pin;
int pin_setting;
int number;
char *name;
};
static struct button_irq_desc button_irqs[] =
{
{IRQ_EINT8 , S3C2410_GPG0 , S3C2410_GPG0_EINT8 , 0, "KEY0"},
{IRQ_EINT11, S3C2410_GPG3 , S3C2410_GPG3_EINT11 , 1, "KEY1"},
{IRQ_EINT13, S3C2410_GPG5 , S3C2410_GPG5_EINT13 , 2, "KEY2"},
{IRQ_EINT14, S3C2410_GPG6 , S3C2410_GPG6_EINT14 , 3, "KEY3"},
{IRQ_EINT15, S3C2410_GPG7 , S3C2410_GPG7_EINT15 , 4, "KEY4"},
{IRQ_EINT19, S3C2410_GPG11, S3C2410_GPG11_EINT19, 5, "KEY5"},
};
static irqreturn_t buttons_interrupt(int irq, void *dev_id) //中断服务程序
{
struct button_irq_desc *button_irq = (struct button_irq_desc *)dev_id; //获取当前中断的资源数据
disable_irq(button_irq->irq); //屏蔽当前中断
key_status[button_irq->number] = KEY_UNCERTAIN; //当前按键状态不确定
key_timers[button_irq->number].expires = jiffies + KEY_TIMER_DELAY1; //设置当前按键的去抖延时
add_timer(&key_timers[button_irq->number]); //启动当前按键的去抖定时器
return IRQ_RETVAL(IRQ_HANDLED);
}
static void buttons_timer(unsigned long arg)
{
int key = arg; //传递过来的是哪一个定时器的索引
struct button_irq_desc *button_irq = &button_irqs[key];
int up = s3c2410_gpio_getpin(button_irq->pin); //获取IO口电平值
if(!up) //按键按下
{
if(key_status[key] == KEY_UNCERTAIN)
{
key_status[key] = KEY_DOWN; //记录下按下状态
ev_press = 1; //标识为1
wake_up_interruptible(&button_waitq); //唤醒等待队列
}
key_timers[key].expires = jiffies + KEY_TIMER_DELAY2; //抬起按键去抖动延时
add_timer(&key_timers[key]);
}
else
{
key_status[key] = KEY_UP; //按键抬起
enable_irq(button_irqs[key].irq); //使能中断
}
}
static int buttons_open(struct inode *inode, struct file *file)
{
int i, ret;
for(i = 0; i < KEY_COUNT; i++)
{
s3c2410_gpio_cfgpin(button_irqs[i].pin, button_irqs[i].pin_setting); //设置中断方式
//中断申请
ret = request_irq(button_irqs[i].irq, buttons_interrupt, IRQ_TYPE_EDGE_BOTH, button_irqs[i].name, (void *)&button_irqs[i]);
if(ret)
{
break;
}
//定时器初始化
key_timers[i].function = buttons_timer;
key_timers[i].data = i;
key_status[i] = KEY_UP;
init_timer(&key_timers[i]);
}
if(ret)
{
i--;
for(; i >= 0; i--)
{
disable_irq(button_irqs[i].irq);
free_irq(button_irqs[i].irq, (void *)&button_irqs[i]);
}
return -EBUSY;
}
return 0;
}
static int buttons_close(struct inode *inode, struct file *file)
{
int i;
for(i = 0; i < KEY_COUNT; i++)
{
disable_irq(button_irqs[i].irq);
free_irq(button_irqs[i].irq, (void *)&button_irqs[i]);
}
return 0;
}
static int buttons_read(struct file *file, char __user *buf, size_t count, loff_t *offp)
{
unsigned long ret;
if(!ev_press)
{
if(file->f_flags & O_NONBLOCK)
{
return -EAGAIN;
}
else
{
wait_event_interruptible(button_waitq, ev_press); //等待队列睡眠
}
}
ev_press = 0;
ret = copy_to_user(buf, (void *)key_status, min(sizeof(key_status), count));
memset((void *)key_status, KEY_UP , sizeof(key_status));
return ret ? -EFAULT : min(sizeof(key_status), count);
}
static int buttons_poll(struct file *file, struct poll_table_struct *wait)
{
unsigned int mask = 0;
poll_wait(file, &button_waitq, wait);
if(ev_press)
{
mask |= POLLIN | POLLRDNORM;
}
return mask;
}
static struct file_operations buttons_fops =
{
.owner = THIS_MODULE,
.open = buttons_open,
.release = buttons_close,
.read = buttons_read,
.poll = buttons_poll,
};
static int __init button_init(void)
{
int ret;
ret = register_chrdev(DEVICE_MAJOR, DEVICE_NAME, &buttons_fops);
if(ret < 0)
{
printk(DEVICE_NAME " register faild!\n");
return ret;
}
return 0;
}
static void __exit button_exit(void)
{
unregister_chrdev(DEVICE_MAJOR, DEVICE_NAME);
}
module_init(button_init);
module_exit(button_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Huang Gang");
MODULE_DESCRIPTION("My2440 button driver");
测试程序：
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
int main(int argc, char **argv)
{
int fd;
int key_values[6];
fd = open("/dev/my2440_buttons", 0);
if(fd < 0)
{
printf("Open Buttons Device Faild!\n");
exit(1);
}
while(1)
{
int ret, i;
ret = read(fd, key_values, sizeof(key_values));
for(i = 0; i < 6; i++)
{
printf("Key%d status=%d!\n", i + 1, key_values[i]);
}
}
close(fd);
return 0;
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[ 此帖被hbhuanggang在2009-11-10 18:31重新编辑 ]
