A8_led_drv A8LED的驱动程序

/*
 * Simple - REALLY simple memory mapping demonstration. 
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>

#include <linux/kernel.h>   /* printk() */
#include <linux/slab.h>   /* kmalloc() */
#include <linux/fs.h>       /* everything... */
#include <linux/errno.h>    /* error codes */
#include <linux/types.h>    /* size_t */
#include <linux/mm.h>
#include <linux/kdev_t.h>
#include <linux/cdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <asm/io.h>
#include <asm/uaccess.h>

#define pGPG3CON 0xE03001C0
#define pGPG3DAT 0xE03001C4
static void *vGPG3CON , *vGPG3DAT;
#define GPG3CON (*(volatile unsigned int *) vGPG3CON)
#define GPG3DAT (*(volatile unsigned int *) vGPG3DAT)
#define LED_ON 0x4800
#define LED_OFF 0x4801

static int simple_major = 250;
module_param(simple_major, int, 0);
MODULE_AUTHOR("farsight");
MODULE_LICENSE("Dual BSD/GPL");

//static int flag = 0;

/*
 * Open the device; in fact, there's nothing to do here.
 */
int simple_open (struct inode *inode, struct file *filp)
{
    vGPG3CON=ioremap(pGPG3CON,0x10);
    vGPG3DAT=vGPG3CON+0x04;
    GPG3CON=0x1111;
    GPG3DAT &= ~0xf;
    printk(KERN_INFO "led device opened  *****************8\n");
    return 0;
}

ssize_t simple_read(struct file *file, char __user *buff, size_t count, loff_t *offp)
{
    return 0;
}

ssize_t simple_write(struct file *file, const char __user *buff, size_t count, loff_t *offp)
{
    return 0;
}

void led_off( void )
{
    printk(KERN_INFO "led off *****************\n");
    GPG3DAT=GPG3DAT|(1<<2);
    //printk("stop led\n");
}
void led_on( void )

{
    printk(KERN_INFO "led on ****************88\n");
    GPG3DAT=GPG3DAT&(~(1<<2));
    //printk("start led\n");
}

static int simple_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
    switch ( cmd ) 
    {
        case LED_ON:
            {
                led_on();
                break;
            }
        case LED_OFF:
            {
                led_off();
                break;
            }
        default:
            {
                break;
            }
    }
    return 0;
}

static int simple_release(struct inode *node, struct file *file)
{
    printk(KERN_INFO "led device release *****************8\n");
    return 0;
}

/*
 * Set up the cdev structure for a device.
 */
static void simple_setup_cdev(struct cdev *dev, int minor,
        struct file_operations *fops)
{
    int err, devno = MKDEV(simple_major, minor);

    cdev_init(dev, fops);
    dev->owner = THIS_MODULE;
    dev->ops = fops;
    err = cdev_add (dev, devno, 1);
    /* Fail gracefully if need be */
    if (err)
        printk (KERN_NOTICE "Error %d adding simple%d", err, minor);
}


/*
 * Our various sub-devices.
 */
/* Device 0 uses remap_pfn_range */
static struct file_operations simple_remap_ops = {
    .owner   = THIS_MODULE,
    .open    = simple_open,
    .release = simple_release,
    .read    = simple_read,
    .write   = simple_write,
    .ioctl   = simple_ioctl,	
};

/*
 * We export two simple devices.  There's no need for us to maintain any
 * special housekeeping info, so we just deal with raw cdevs.
 */
static struct cdev SimpleDevs;

/*
 * Module housekeeping.
 */
static struct class *my_class;
static int simple_init(void)
{
    int result;
    dev_t dev = MKDEV(simple_major, 0);

    /* Figure out our device number. */
    if (simple_major)
        result = register_chrdev_region(dev, 1, "led");
    else {
        result = alloc_chrdev_region(&dev, 0, 1, "led");
        simple_major = MAJOR(dev);
    }
    if (result < 0) {
        printk(KERN_WARNING "simple: unable to get major %d\n", simple_major);
        return result;
    }
    if (simple_major == 0)
        simple_major = result;

    /* Now set up two cdevs. */
    simple_setup_cdev(&SimpleDevs, 0, &simple_remap_ops);
    printk("simple device installed, with major %d\n", simple_major);
    my_class= class_create(THIS_MODULE, "led");
    device_create(my_class, NULL, MKDEV(simple_major, 0),
            NULL, "led");
    return 0;
}


static void simple_cleanup(void)
{
    cdev_del(&SimpleDevs);
    unregister_chrdev_region(MKDEV(simple_major, 0), 1);

    device_destroy(my_class,MKDEV(simple_major,0));
    class_destroy(my_class);
    printk("simple device uninstalled\n");
}


module_init(simple_init);
module_exit(simple_cleanup);

/*
 * main.c : test demo driver
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#define LED_ON 0x4800
#define LED_OFF 0x4801
int main()
{
	int i = 0;
	int dev_fd;
	dev_fd = open("/dev/led",O_RDWR | O_NONBLOCK);
	if ( dev_fd == -1 ) {
		printf("Cann't open file /dev/led\n");
		exit(1);
	}
	while(1)
	{
	ioctl(dev_fd,LED_ON,0);
    printf("LED ON ___________________\n");
	sleep(1);
	ioctl(dev_fd,LED_OFF,0);
    printf("LED OFF ___________-\n");
	sleep(1);
	}
	return 0;
}

ifeq ($(KERNELRELEASE),)

KERNELDIR ?= /source/android-2.6.29-samsung

PWD := $(shell pwd)

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

modules_install:
	$(MAKE) -C $(KERNELDIR) M=$(PWD) modules_install

clean:
	rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions

.PHONY: modules modules_install clean

else
    obj-m := led_drv.o
endif