linux裡面的misc雜項裝置是主裝置號為10的驅動裝置，它的註冊跟使用比較的簡單，所以比較適用於功能簡單的裝置。
它有自己的裝置結構體：
struct miscdevice ;
它在標頭檔案linux/miscdevice.h裡面有定義，
其中minor是misc裝置的副裝置號，misc裝置主要依賴minor去區分，如果設定為misc_dynamic_minor則表示系統自動分配未使用的minor
nodename是在/dev下面建立的裝置驅動節點，
fops是驅動主體處理函式入口指標
主要使用到的函式有：
int misc_register(struct miscdevice * misc);
int misc_deregister(struct miscdevice *misc);
misc01.c檔案
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#include
#include
#include
#include
/module_license("dual bsd/gpl");
int open_state = 0;
/int misc01_open(struct inode *inode, struct file *filp)
printk("misc01 has been open!\n");
return -1;
} int misc01_release(struct inode *inode, struct file *filp)
printk("misc01 has not been open yet!\n");
return -1;
} ssize_t misc01_read(struct file *filp, char *buf,
size_t count, loff_t fpos)
ssize_t misc01_write(struct file *filp, char *buf,
size_t count, loff_t fpos)
int misc01_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg) /
struct file_operations fops =
; struct miscdevice dev =
; int setup_misc01(void) /
static
int __init misc01_init(void)
static
void __exit misc01_exit(void) /
module_init(misc01_init);
module_exit(misc01_exit);
makefile檔案
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#makefile
obj-m := misc01.o
pwd := $(shell pwd)
k_dir := /lib/modules/$(shell uname -r)/build
all:
$(make) -c $(k_dir) m=$(pwd) modules
clean:
$(make) -c $(k_dir) m=$(pwd) clean
test:misc01_test.o
gcc -o $@ lt;
misc01_test.c檔案
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#include
#include
#include
#include
#include
/int main(int argc, char **argv)
printf("open /dev/misc01_node ok!\n");
if (ioctl(fd, 6) != 0)
else
printf("ioctl ok!\n");
close(fd);
return 0;
}
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