LLeader(94125943) 20:48:49
我编写的LED驱动，其中寄存器的配置在ADS调试时没有问题。但是在linux操作系统里面，不能驱动，程序如下，请高手指教：
/*#define MODULE*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/uaccess.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include <linux/ioport.h>
#include <linux/fs.h>
#include <linux/wrapper.h>
#define DRAM_MEM_MAJOR 231
#define DEVICE_NAME "device_led"
#define SUCCESS 0
static int Device_Open = 0;
int dram_mem_init(void);
static int device_open(struct inode *,struct file *);
static int device_release(struct inode *,struct file *);
static ssize_t device_write(struct file *,const char *,size_t,loff_t *);
int init_module(void);
void cleanup_module(void);
struct file_operations dram_mem_ops =
{
read: device_read,
write: device_write,
open: device_open,
release: device_release,
};
static int Major;
unsigned long virt_addr0;
unsigned long virt_addr1;
unsigned long virt_addr2;
int dram_mem_init(void)
{
virt_addr0 = (unsigned long)ioremap((unsigned long)0x56000050,0x4);
*(unsigned long *)virt_addr0&= 0x00ff;//娓呴浂
*(unsigned long *)virt_addr0|= 0x5500;//杈撳嚭鏈夋晥
virt_addr1 = (unsigned long)ioremap((unsigned long)0x56000054,0x4);
*(unsigned long *)virt_addr1=0x0;
virt_addr2 = (unsigned long)ioremap((unsigned long)0x56000058,0x4);
*(unsigned long *)virt_addr2&= 0x0f;//IO浣胯兘
Major = register_chrdev(DRAM_MEM_MAJOR,DEVICE_NAME,&dram_mem_ops);
if(Major <0)
{
iounmap((void *)virt_addr0);
iounmap((void *)virt_addr1);
iounmap((void *)virt_addr2);
printk("DRAM_MEM init_module:failed with %d
",Major);
return Major;
}
Major = DRAM_MEM_MAJOR;
printk("DRAM_MEM_MAJOR registred: Major = %d
" ,Major);
return 0;
}
static int device_open(struct inode * inode,struct file *file)
{
if(Device_Open)
{
return -EBUSY;
}
Device_Open++;
MOD_INC_USE_COUNT;
return SUCCESS;
}
static int device_release(struct inode * inode,struct file *file)
{
Device_Open --;
MOD_DEC_USE_COUNT;
return 0;
}
#ifdef MODULE
int init_module()
{
return dram_mem_init();
}
void cleanup_module()
{
int ret;
iounmap((void *)virt_addr0);
iounmap((void *)virt_addr1);
iounmap((void *)virt_addr2);
ret = unregister_chrdev(Major,DEVICE_NAME);
if(ret < 0)
{
printk("unregister_chrdev:error %d
",ret);
}
}
#endif
|
楼主
标题置顶
标题高亮
来自 2楼
