進(jìn)入驅(qū)動(dòng)學(xué)習(xí)后寫的一個(gè)針對(duì)我們用的2440板子的LED驅(qū)動(dòng)，應(yīng)用程序略去了，主要通過(guò)GPIO_data結(jié)構(gòu)體傳遞控制信息，支持多線程。

/* Ioctl_c.h*/

#ifndef __IOCTL_C_H__
#define __IOCTL_C_H__

typedef struct GPIO_data
{
char port;
unsigned int bit;
unsigned int value;
}GPIO_data;

#define GPIO_IOC_MAGIC 15

#define GPIO_IO_SET_CFG _IOW(GPIO_IOC_MAGIC,0,sizeof(GPIO_data))
#define GPIO_IO_GET_CFG _IOWR(GPIO_IOC_MAGIC,1,sizeof(GPIO_data))
#define GPIO_IO_WRITE _IOW(GPIO_IOC_MAGIC,2,sizeof(GPIO_data))
#define GPIO_IO_READ _IOWR(GPIO_IOC_MAGIC,3,sizeof(GPIO_data))

#define PORT_LENGTH 0x10
#define DAT_OFFSET 0x04
#define CFG_OFFSET 0

#endif

/* mydev.c */

#include
#include
#include
#include
#include
#include
#include
#include ccess.h>
#include
#include
#include
#include
#include
#include gpio.h>
#include
#include
#include "ioctl_c.h"
#include

unsigned int test_major=253;
unsigned int test_minor=0;
struct cdev cdevc;
MODULE_LICENSE("Dual BSD/GPL");
struct semaphore my_lock;

static int gpio_write(unsigned long ptr)
{
unsigned long regs_offset=0,data_regs_addr;
int original=0,recent=0;
struct GPIO_data *struct_ptr;

down_interruptible(&my_lock);
//copy_from_user(struct_ptr,(struct GPIO_data *)ptr,sizeof(struct GPIO_data));
struct_ptr = (struct GPIO_data *)ptr;
regs_offset = (int)(struct_ptr->port)-97;
data_regs_addr = regs_offset*PORT_LENGTH+DAT_OFFSET;
original = __raw_readl(S3C2410_GPIOREG(data_regs_addr));
recent = (original & ~(1<<(struct_ptr->bit)))|((struct_ptr->value)<<(struct_ptr->bit));
__raw_writel(recent,S3C2410_GPIOREG(data_regs_addr));
up(&my_lock);

return 0;
}

static int gpio_read(unsigned long ptr)
{
unsigned long regs_offset=0,data_regs_addr;
struct GPIO_data *struct_ptr;
int original=0;

down_interruptible(&my_lock);
//copy_from_user(struct_ptr,(struct GPIO_data *)ptr,sizeof(struct GPIO_data));
regs_offset = (int)(struct_ptr->port)-97;
data_regs_addr = regs_offset*PORT_LENGTH+DAT_OFFSET;
original = __raw_readl(S3C2410_GPIOREG(data_regs_addr));
struct_ptr->value = (original&(1<< struct_ptr->bit))? 1:0;
//copy_to_user((struct GPIO_data *)ptr,struct_ptr,sizeof(struct GPIO_data));
up(&my_lock);

return 0;
}

static int gpio_setconf(unsigned long ptr)
{
unsigned long regs_offset=0,cfg_regs_addr;
int original=0,recent=0;
struct GPIO_data *struct_ptr=NULL;

down_interruptible(&my_lock);
//copy_from_user(struct_ptr,(struct GPIO_data *)ptr,sizeof(struct GPIO_data));
struct_ptr = (struct GPIO_data *)ptr;
regs_offset = (int)(struct_ptr->port)-97;
cfg_regs_addr = regs_offset*PORT_LENGTH+CFG_OFFSET;
original = __raw_readl(S3C2410_GPIOREG(cfg_regs_addr));
recent = (original & ~(1<<(struct_ptr->bit)))|((struct_ptr->value)<<(struct_ptr->bit));
__raw_writel(recent,S3C2410_GPIOREG(cfg_regs_addr));
up(&my_lock);

return 0;
}

static int gpio_getconf(unsigned long ptr)
{
unsigned long regs_offset=0,cfg_regs_addr;
struct GPIO_data *struct_ptr=NULL;
int original=0;

down_interruptible(&my_lock);
//copy_from_user(struct_ptr,(struct GPIO_data *)ptr,sizeof(struct GPIO_data));
regs_offset = (int)(struct_ptr->port)-97;
cfg_regs_addr = regs_offset*PORT_LENGTH+CFG_OFFSET;
original = __raw_readl(S3C2410_GPIOREG(cfg_regs_addr));
struct_ptr->value = (original&(1<< struct_ptr->bit))? 1:0;
//copy_to_user((struct GPIO_data *)ptr,struct_ptr,sizeof(struct GPIO_data));
up(&my_lock);

return 0;
}

static int ioctl_test(struct inode *inode,struct file *file,unsigned int cmd,unsigned long arg)
{
switch(cmd)
{
case GPIO_IO_GET_CFG: gpio_getconf(arg);break;
case GPIO_IO_SET_CFG: gpio_setconf(arg);break;
case GPIO_IO_WRITE: gpio_write(arg);break;
case GPIO_IO_READ: gpio_read(arg);break;
default:break;
}
return 0;
}

static int open_test(struct inode *inode,struct file *file)
{
printk("nOpen_testn");
return 0;
}

static void release_test(struct inode *inode,struct file *file)
{
printk("nRelease_testn");
}

struct file_operations test_fops={
.owner=THIS_MODULE,
.read=read_test,
.write=write_test,
.ioctl=ioctl_test,
.open=open_test,
.release=release_test,
};

int mydev_c_init_module(void)
{
int result;
dev_t dev=0;

sema_init(&my_lock,1);
dev=MKDEV(test_major,test_minor);
result=register_chrdev_region(dev,1,"mydev_test");
printk("major=%d,minor=%dn",test_major,test_minor);
if(result<0)
{
printk(KERN_INFO "test:can't get major numbern");
return result;
}
cdev_init(&cdevc,&test_fops);
cdevc.owner=THIS_MODULE;
cdevc.ops=&test_fops;
result=cdev_add(&cdevc,dev,1);
if(result)
printk("Error %d adding test ",result);
return 0;
}

void mydev_c_remv_module(void)
{
dev_t dev=0;
dev=MKDEV(test_major,test_minor);
cdev_del(&cdevc);
unregister_chrdev_region(dev,1);
printk("nRemove modulen");
}

module_init(mydev_c_init_module);
module_exit(mydev_c_remv_module);

/* Makefile */
ifeq ($(KERNELRELEASE),)

KERNELDIR = /home/yangfan/bootloader_kernel/utu-linux_for_s3c2440_V1.5.3

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 := mydev.o
endif