字元裝置模板

源**：

#include #include 

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
//module_param(mem_major, int, s_irugo); 
#define memdev_major 260 /*預設的mem的主裝置號*/ 
#define memdev_nr_devs 2 /*裝置數*/ 
#define memdev_size 4096 
#define char_dev_name "memdev"
static
int mem_major = 0; //
memdev_major; 
struct
class *pclass =null; 
struct
cdev my_dev; 
int mem_open(struct inode *inode, struct file *filp) 
int mem_release(struct inode *inode, struct file *filp) 
/*'k'為幻數，要按照linux核心的約定方法為驅動程式選擇ioctl編號，
應該首先看看include/asm/ioctl.h和documentation/ioctl-number.txt這兩個檔案.
對幻數的編號千萬不能重複定義，如ioctl-number.txt已經說明『k'的編號已經被占用的範圍為：
'k' 00-0f linux/spi/spidev.h conflict!
'k' 00-05 video/kyro.h conflict!
所以我們在這裡分別編號為0x1a和0x1b
*/#define cmd_magic 'k'
#define mem_cmd1 _io(cmd_magic, 0x1a)
#define mem_cmd2 _io(cmd_magic, 0x1b)
int temp_data = 0
;static
int mem_ioctl( struct file *file, unsigned int cmd, unsigned long
arg)
//printk(kern_notice"ioctl cmd%d done!\n",temp); 
return0;
}static
const
struct file_operations mem_fops =; 
static
int memdev_init(void
) 
else 
if (result < 0
) 
return
result; 
cdev_init(&my_dev, &mem_fops); 
my_dev.owner =this_module; 
my_dev.ops = &mem_fops; 
cdev_add(&my_dev, mkdev(mem_major, 0
), memdev_nr_devs); 
pclass =class_create(this_module, char_dev_name); 
if(is_err(pclass)) 
device_create(pclass, null, devno, null, char_dev_name); 
return
0; 
failed: 
cdev_del(&my_dev);
unregister_chrdev_region(devno, 
1); 
return
result; 
} 
static
void memdev_exit(void
) 
module_author(
"derek yi
"); 
module_license(
"gpl
"); 
module_init(memdev_init); 
module_exit(memdev_exit);

makefile：

ifneq ($(kernelrelease),)

obj-m:=memdev.o
else
kerneldir:=/lib/modules/$(shell uname -r)/build
pwd:=$(shell pwd)
default
: $(make) -c $(kerneldir) m=$(pwd) modules
clean:
rm -rf *.o *.mod.c *.mod.o *.ko
endif

測試**：

#include #include 

#include 
#include 
#include 
#include 
#include 
#include 
#define cmd_magic 'k'
#define mem_cmd1 _io(cmd_magic, 0x1a) //
write
#define mem_cmd2 _io(cmd_magic, 0x1b) //
read
intmain()
ret = ioctl(fd, mem_cmd2, &rdata);
printf(
"ioctl: ret=%d rdata=%d\n
", ret, rdata);
wdata = 42
; ret = ioctl(fd, mem_cmd1, &wdata);
ret = ioctl(fd, mem_cmd2, &rdata);
printf(
"ioctl: ret=%d rdata=%d\n
", ret, rdata);
close(fd);
return0;
}

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