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内核版本:2.6.25.8
#include<linux/module.h>
#include<linux/kernel.h>
#include<linux/fs.h>
#include<linux/init.h>
#include<linux/delay.h>
#include<asm/irq.h>
#include<linux/interrupt.h>
#include<asm/uaccess.h>
#include<asm/arch/regs-gpio.h>
#include<asm/hardware.h>
#include<linux/device.h>
#include<linux/poll.h>
#define DEVICE_NAME "ZJF-Buttons"
#define BUTTON_MAJOR 232
struct button_irq_desc
{
int irq;
int pin;
int pin_setting;
int number;
char *name;
};
static struct button_irq_desc button_irqs[]=
{
{IRQ_EINT1,S3C2410_GPF1, S3C2410_GPF1_EINT1, 1,"KEY1"}, //K1
{IRQ_EINT2,S3C2410_GPF2, S3C2410_GPF2_EINT2, 2,"KEY2"}, //K2
{IRQ_EINT3,S3C2410_GPF3, S3C2410_GPF3_EINT3, 3,"KEY3"}, //K3
};
static volatile int key_values[]={0,0,0,0};
static DECLARE_WAIT_QUEUE_HEAD(button_waitq);
static volatile int ev_press=0;
static irqreturn_t buttons_interrupt(int irq,void *dev_id)
{
struct button_irq_desc *button_irqs=(struct button_irq_desc *)dev_id;
int up=s3c2410_gpio_getpin(button_irqs->pin);
if(up)
key_values[button_irqs->number]=(button_irqs->number+1)+0x80;
else
key_values[button_irqs->number]=(button_irqs->number+1);
ev_press=1;
wake_up_interruptible(&button_waitq);
return IRQ_RETVAL(IRQ_HANDLED);
}
static int EmbedSky_buttons_open(struct inode *inode,struct file *file)
{
int i;
int err;
for(i=0;i<sizeof(button_irqs)/sizeof(button_irqs[0]);i++)
{
s3c2410_gpio_cfgpin(button_irqs[i].pin,button_irqs[i].pin_setting);
err=request_irq(button_irqs[i].irq, buttons_interrupt, NULL,button_irqs[i].name,(void *)&button_irqs[i]);
if(err)break;
}
if(err)
{
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 EmbedSky_buttons_close(struct inode *inode,struct file *file)
{
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]);
}
return 0;
}
static int EmbedSky_buttons_read(struct file *filp,char __user *buff,size_t count,loff_t *offp)
{
unsigned long err;
if(!ev_press)
{
if(filp->f_flags& O_NONBLOCK)
return -EAGAIN;
else
wait_event_interruptible(button_waitq,ev_press);
}
ev_press=0;
err=copy_to_user(buff,(const void *)key_values,min(sizeof(key_values),count));
memset((void *)key_values,0,sizeof(key_values));
return err ? -EFAULT:min(sizeof(key_values),count);
}
static unsigned int EmbedSky_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 EmbedSky_buttons_fops=
{
.owner = THIS_MODULE,
.open = EmbedSky_buttons_open,
.release= EmbedSky_buttons_close,
.read = EmbedSky_buttons_read,
.poll = EmbedSky_buttons_poll,
};
static char __initdata banner[]="TQ2440/SKY2440 LEDS,(c)2008,2009www.embedsky.net\n";
//static struct class *button_class;
static int __init EmbedSky_buttons_init(void)
{
int ret;
printk(banner);
ret=register_chrdev(BUTTON_MAJOR,DEVICE_NAME,&EmbedSky_buttons_fops);
if(ret<0)
{
printk(DEVICE_NAME"can't register major number\n");
return ret;
}
//注册一个类,使mdev可以在"/dev/"目录下面建立设备 节点
/* button_class=class_create(THIS_MODULE,DEVICE_NAME);
if(IS_ERR(button_class))
{
printk("Err:failed in EmbedSky-leds class.\n");
return -1;
}
class_device_create(button_class,NULL,MKDEV(BUTTON_MAJOR,0),NULL,DEVICE_NAME);
*/
printk(DEVICE_NAME"initialized\n");
return 0;
}
static void __exit EmbedSky_buttons_exit(void)
{
unregister_chrdev(BUTTON_MAJOR,DEVICE_NAME);
class_device_destroy(button_class,MKDEV(BUTTON_MAJOR,0)); //删掉设备节点节点
class_destroy(button_class); //注销类类
}
module_init(EmbedSky_buttons_init);
module_exit(EmbedSky_buttons_exit);
谢谢! |
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