while(DS18b20_reset());

}

static void __exit s3c2440_18b20_exit(void)

{

devfs_remove(DEV_NAME);

unregister_chrdev(DEV_MAJOR, DEV_NAME);

}

module_init(s3c2440_18b20_init);

module_exit(s3c2440_18b20_exit);

#include "stdio.h"

#include "sys/types.h"

#include "sys/ioctl.h"

#include "stdlib.h"

#include "termios.h"

#include "sys/stat.h"

#include "fcntl.h"

#include "sys/time.h"

main()

{

int fd;

unsigned char buf[2];

float result;

if ((fd=open("/dev/DS18B20",O_RDWR | O_NDELAY | O_NOCTTY)) < 0)

{

printf("Open Device DS18B20 failed.\r\n");

exit(1);

}

else

{

printf("Open Device DS18B20 successed.\r\n");

while(1)

{

read(fd, buf, 1);

result = (float)buf[0];

result /= 16;

result += ((float)buf[1] * 16);

printf("%.1f `C\r\n", result);

sleep(1);

}

close(fd);

}

}

obj-m := s3c2440_ds18b20.o

KERNELDIR = ../../kernel/linux-2.6.29

PWD := $(shell pwd)

CC := arm-linux-gcc

CLEAN := rm -rf

all : s3c2440_ds18b20.c test_ds18b20

$(MAKE) -C $(KERNELDIR) M=$(PWD) modules

test_ds18b20 : test_ds18b20.c

$(CC) test_ds18b20.c -o test_ds18b20

clobber :

$(CLEAN) test_ds18b20 s3c2440_ds18b20.ko

clean :

$(CLEAN) *.mod.* *.o *~ modules.order Module.symvers