Linux LED light Driver

1. Drivers

Led.c

#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/types.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <mach/regs-gpio.h>
#include <asm/uaccess.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <mach/hardware.h>
#include <linux/miscdevice.h>

#define LIGHT_ON 0x01
#define Light_off 0X02

#define GPBCON S3c2410_gpbcon
#define GPBDAT S3c2410_gpbdat
#define GPBUP S3c2410_gpbup

#define LED_ON_1 ~ (1<<5)
#define LED_ON_2 ~ (1<<6)
#define LED_ON_3 ~ (1<<7)
#define LED_ON_4 ~ (1<<8)

#define DEVICE_NAME "Linux_led"

Module_author ("Xiaoheng");

void light_on (void)
{
Writel (led_on_1, Gpbdat);
Mdelay (300);
PRINTK ("one");

Writel (led_on_2, Gpbdat);
Mdelay (300);
PRINTK ("both");

Writel (Led_on_3, Gpbdat);
Mdelay (300);
PRINTK ("three");

Writel (Led_on_4, Gpbdat);
Mdelay (300);
PRINTK ("four");

Writel (0, Gpbdat);
Mdelay (300);
PRINTK ("All on\n");
}

void Light_off (void)
{
Writel (0xffff,gpbdat);
}

int Light_open (struct inode* inode, struct file* filp)
{
PRINTK ("myled open now!");
Writel ((1<<10) | (1<<12) | (1<<14) | (1<<16), Gpbcon);
Writel (0, Gpbdat);
return 0;
}

int light_release (struct inode* inode, struct file* filp)
{
PRINTK ("myled close now!");
return 0;
}

int Light_ioctl (struct inode* inode, struct file* filp, unsigned int cmd,unsigned long T)
{
Switch (CMD)
{
Case LIGHT_ON:
Light_on ();
Break

Case Light_off:
Light_off ();
Break
Default
Return-enotty;
}
return 0;
}

struct File_operations light_fops = {
. Owner = This_module,
. IOCTL = Light_ioctl,
. open = Light_open,
. Release = Light_release,
};

static struct Miscdevice misc = {
. minor = Misc_dynamic_minor,
. Name = Device_name,
. FoPs = &light_fops,
};

int light_init (void)
{
int ret;
PRINTK ("My LED init now\n");

ret = Misc_register (&MISC);
PRINTK (device_name "initialized\n");

return ret;
}

void Light_cleanup (void)
{
PRINTK ("myled over\n");
Misc_deregister (&MISC);
}

Module_init (Light_init);
Module_exit (Light_cleanup);

2. Test procedures

Ledtest.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>

#define LED_ON 0x01
#define Led_off 0x01

void Delay ()
{
unsigned int i, J;
for (i = 0; i < 0xf; i++)
for (j = 0; J < 0xFF; J + +)
;
}

int main (int argc, char **argv)
{
int FD;

FD = open ("/dev/linux_led", 0);

if (strcmp (argv[1], "0"))
{
while (1)
{
Delay ();
IOCTL (FD, led_on, 0);
printf ("1\n");
}
}
else if (strcmp (argv[1], "1"))
{
printf ("0");
IOCTL (FD, Led_off, 0);
}

return 0;

}

3.Makefile

obj-m:=led.o

kdir:=/home/xiaoheng/desktop/2.6.30.4/opt/embedsky/linux-2.6.30.4
All
Make-c $ (kdir) m=$ (shell pwd) modules
Clean
Make-c $ (kdir) m=$ (shell pwd) clean