当前位置：首页 → 问答吧 → led驱动编绎能不过？

led驱动编绎能不过？

时间：2010-07-28

来源：互联网

编绎器版本：arm-linux-gcc 2.9.5
内核版本：2.6.12
Make时出错如下提示，请高手指点。

S3C2440_LEDS.C
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <asm/irq.h>
#include <asm/arch/regs-gpio.h>
#include <asm/hardware.h>
#define DEVICE_NAME "leds" //定义设备名
#define LED_MAJOR 231 //手动定义主设备号
//定义要操作的设备，把每一个led作为结构体的一个成员
static unsigned long led_table [] = {
S3C2410_GPF3,
S3C2410_GPF4,
S3C2410_GPF5,
S3C2410_GPF6,
S3C2410_GPF7,
};
//对设备进行设置，结构体的每一个成员是对对应led的设置
static unsigned int led_cfg_table [] = {
S3C2410_GPF3_OUTP,
S3C2410_GPF4_OUTP,
S3C2410_GPF5_OUTP,
S3C2410_GPF6_OUTP,
S3C2410_GPF7_OUTP,
};
static struct cdev *cd=NULL;
//设备驱动程序中对设备的I/O通道进行管理的函数，用来实现对led的操作
static int s3c2440_leds_ioctl(
struct inode *inode,
struct file *file,
unsigned int cmd,
unsigned long arg)
{
switch(cmd) {
case 0:
case 1:
if (arg > 4) {
return -EINVAL;
}
s3c2410_gpio_setpin(led_table[arg], !cmd);
return 0;
default:
return -EINVAL;
}
}
static struct file_operations s3c2440_leds_fops = {
.owner = THIS_MODULE,
.ioctl = s3c2440_leds_ioctl,
};
//模块加载函数
static int s3c2440_leds_init(void)
{
int ret;
int i;
int result;
dev_t devno = MKDEV(LED_MAJOR, 0);
//注册设备号
result = register_chrdev_region(devno, 1, DEVICE_NAME);
if(result<0)
{
printk(DEVICE_NAME " initialized fail :device num busy\n");
return result;
}
cd =cdev_alloc();
if(cd==NULL)
{
printk(KERN_NOTICE "CDEV_ALLOC ERROR");
unregister_chrdev_region(MKDEV(LED_MAJOR, 0), 1);
return -20;
}
cdev_init(cd, &s3c2440_leds_fops);
cd->owner = THIS_MODULE;
cd->ops = &s3c2440_leds_fops;
ret = cdev_add(cd, devno, 1);
if (ret)
{
printk(KERN_NOTICE "CDEV_ADD LED ERROR");
kfree(cd);
unregister_chrdev_region(MKDEV(LED_MAJOR, 0), 1);
return -10;
}
devfs_mk_cdev(MKDEV(LED_MAJOR, 0), S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP, DEVICE_NAME);
for (i = 0; i < 5; i++) {
s3c2410_gpio_cfgpin(led_table[i], led_cfg_table[i]);
s3c2410_gpio_setpin(led_table[i], 1);
}
printk(DEVICE_NAME " initialized OK\n");
return 0;
}
//模块卸载函数
static void s3c2440_leds_exit(void)
{
devfs_remove(DEVICE_NAME);
cdev_del(cd);
unregister_chrdev_region(MKDEV(LED_MAJOR, 0), 1);
}
//MODULE_AUTHOR("HeLun);
MODULE_LICENSE("Dual BSD/GPL");
module_init(s3c2440_leds_init);
module_exit(s3c2440_leds_exit);
Makefile
obj-m :=s3c2440_leds.o
KERNELDIR := /helun/driver/linux-2.6.12
default:
make -C $(KERNELDIR) M=$(shell pwd) modules
install:
insmod s3c2440_leds.ko
uninstall:
rmmod s3c2440_leds.ko
clean:
make -C $(KERNELDIR) M=$(shell pwd) clean
编绎出错：
>make
make -C /helun/driver/linux-2.6.12 M=/helun/driver/led_Helun modules
make[1]: Entering directory `/helun/driver/linux-2.6.12'
CC [M] /helun/driver/led_Helun/s3c2440_leds.o
/helun/driver/led_Helun/s3c2440_leds.c: In function `s3c2440_leds_init':
/helun/driver/led_Helun/s3c2440_leds.c:78: warning: implicit declaration of function `cdev_alloc'
/helun/driver/led_Helun/s3c2440_leds.c:78: warning: assignment makes pointer from integer without a cast
/helun/driver/led_Helun/s3c2440_leds.c:86: warning: implicit declaration of function `cdev_init'
/helun/driver/led_Helun/s3c2440_leds.c:87: dereferencing pointer to incomplete type
/helun/driver/led_Helun/s3c2440_leds.c:88: dereferencing pointer to incomplete type
/helun/driver/led_Helun/s3c2440_leds.c:89: warning: implicit declaration of function `cdev_add'
/helun/driver/led_Helun/s3c2440_leds.c: In function `s3c2440_leds_exit':
/helun/driver/led_Helun/s3c2440_leds.c:114: warning: implicit declaration of function `cdev_del'
make[2]: *** [/helun/driver/led_Helun/s3c2440_leds.o] 错误 1
make[1]: *** [_module_/helun/driver/led_Helun] 错误 2
make[1]: Leaving directory `/helun/driver/linux-2.6.12'

复制代码