TARGET_NAME = read_gpio
APP_NAME = app_read_gpio
obj-m += $(TARGET_NAME).oKDIR := /home/topeet/chen/kernel-3.0/iTop4412_Kernel_3.0PWD ?= $(shell pwd)all:appmake -C $(KDIR) M=$(PWD) modulesapp:$(APP_NAME)arm-none-linux-gnueabi-gcc $(APP_NAME).c -o $(APP_NAME) -staticclean:rm -rf *.o *.ko *.mod.c *.symvers *.order \.$(TARGET_NAME)* $(APP_NAME)

#include <linux/init.h>
#include <linux/module.h>/*驱动注册的头文件，包含驱动的结构体和注册和卸载的函数*/
#include <linux/platform_device.h>
/*注册杂项设备头文件*/
#include <linux/miscdevice.h>
/*注册设备节点的文件结构体*/
#include <linux/fs.h>/*Linux中申请GPIO的头文件*/
#include <linux/gpio.h>
/*三星平台的GPIO配置函数头文件*/
/*三星平台EXYNOS系列平台，GPIO配置参数宏定义头文件*/
#include <plat/gpio-cfg.h>
#include <mach/gpio.h>
/*三星平台4412平台，GPIO宏定义头文件*/
#include <mach/gpio-exynos4.h>#define DRIVER_NAME "read_gpio_ctl"
#define DEVICE_NAME "read_gpio_ctl"MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("TOPEET");static long read_gpio_ioctl( struct file *files, unsigned int cmd, unsigned long arg)
{printk("cmd is %d,arg is %d\n",cmd,arg);if(cmd > 1){printk(KERN_EMERG "cmd is 0 or 1\n");}if(arg > 1){printk(KERN_EMERG "arg is only 1\n");}//if cmd is 0, return GPC(3)>>switch3//if cmd is 1, return GPX(6)>>switch4if(cmd == 0) {return gpio_get_value(EXYNOS4_GPC0(3));}if(cmd == 1) {return gpio_get_value(EXYNOS4_GPX0(6));}return 0;
}static int read_gpio_release(struct inode *inode, struct file *file)
{printk(KERN_EMERG "read_gpio release\n");return 0;
}static int read_gpio_open(struct inode *inode, struct file *file)
{printk(KERN_EMERG "read_gpio open\n");return 0;
}static struct file_operations read_gpio_ops = {.owner = THIS_MODULE,.open = read_gpio_open,.release = read_gpio_release,.unlocked_ioctl = read_gpio_ioctl,
};static  struct miscdevice read_gpio_dev = {.minor = MISC_DYNAMIC_MINOR,.name = DEVICE_NAME,.fops = &read_gpio_ops,
};static int read_gpio_probe(struct platform_device *pdv)
{int ret;printk(KERN_EMERG "\tinitialized\n");ret = gpio_request(EXYNOS4_GPC0(3),"Switch3");if(ret < 0){printk(KERN_EMERG "gpio_request EXYNOS4_GPL2(0) failed!\n");return ret;} else {s3c_gpio_cfgpin(EXYNOS4_GPC0(3), S3C_GPIO_INPUT);s3c_gpio_setpull(EXYNOS4_GPC0(3), S3C_GPIO_PULL_NONE);}ret = gpio_request(EXYNOS4_GPX0(6),"Switch4");if(ret < 0){printk(KERN_EMERG "gpio_request EXYNOS4_GPL2(0) failed!\n");return ret;} else {s3c_gpio_cfgpin(EXYNOS4_GPX0(6), S3C_GPIO_INPUT);s3c_gpio_setpull(EXYNOS4_GPX0(6), S3C_GPIO_PULL_NONE);}misc_register(&read_gpio_dev);return 0;
}static int read_gpio_remove(struct platform_device *pdv)
{    printk(KERN_EMERG "\tremove\n");gpio_free(EXYNOS4_GPC0(3));gpio_free(EXYNOS4_GPX0(6));misc_deregister(&read_gpio_dev);return 0;
}static void read_gpio_shutdown(struct platform_device *pdv)
{;
}static int read_gpio_suspend(struct platform_device *pdv,pm_message_t pmt)
{return 0;
}static int read_gpio_resume(struct platform_device *pdv)
{return 0;
}struct platform_driver read_gpio_driver = {.probe = read_gpio_probe,.remove = read_gpio_remove,.shutdown = read_gpio_shutdown,.suspend = read_gpio_suspend,.resume = read_gpio_resume,.driver = {.name = DRIVER_NAME,.owner = THIS_MODULE,}
};static int read_gpio_init(void)
{int DriverState;printk(KERN_EMERG "read_gpio enter!\n");DriverState = platform_driver_register(&read_gpio_driver);printk(KERN_EMERG "\tDriverState is %d\n",DriverState);return 0;
}static void read_gpio_exit(void)
{printk(KERN_EMERG "read_gpio exit!\n");platform_driver_unregister(&read_gpio_driver);
}module_init(read_gpio_init);
module_exit(read_gpio_exit);

#include <stdio.h>#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>#include <string.h>#define GPIOS 32int main(int argc, char *argv[])
{int fd, i, cmd = 2;char *read_gpio = "/dev/read_gpio_ctl";char *cmd0 = "0";char *cmd1 = "1";printf("argv[0] is %s;argv[1] is %s;\n", argv[0], argv[1]);if(strcmp(argv[1], cmd0) == 0) {cmd = 0;}if(strcmp(argv[1], cmd1) == 0) {cmd = 1;}if((fd = open(read_gpio, O_RDWR|O_NDELAY)) < 0) {printf("APP open %s failed\n", read_gpio);} else {printf("APP open %s success!\n", read_gpio);printf("%d io value is %d\n", cmd, ioctl(fd, cmd, 0));}close(fd);
}

[root@iTOP-4412]# ./app_read_gpio 1
argv[0] is ./app_[  312.514145] read_gpio open
[  312.516876] cmd is 1,arg is 0
[  312.519870] read_gpio release
read_gpio;argv[1] is 1;
APP open /dev/read_gpio_ctl success!
1 io value is 0
[root@iTOP-4412]# ./app_read_gpio 0
argv[0] is ./app_[  314.786489] read_gpio open
[  314.789131] cmd is 0,arg is 0
[  314.792307] read_gpio release
read_gpio;argv[1] is 0;
APP open /dev/read_gpio_ctl success!
0 io value is 0
[root@iTOP-4412]# ./app_read_gpio 1
argv[0] is ./app_[  321.786146] read_gpio open
[  321.788790] cmd is 1,arg is 0
[  321.791899] read_gpio release
read_gpio;argv[1] is 1;
APP open /dev/read_gpio_ctl success!
1 io value is 1
[root@iTOP-4412]# ./app_read_gpio 0
argv[0] is ./app_[  323.449833] read_gpio open
[  323.452526] cmd is 0,arg is 0
[  323.455489] read_gpio release
read_gpio;argv[1] is 0;
APP open /dev/read_gpio_ctl success!
0 io value is 1

#include <linux/init.h>
#include <linux/module.h>
#include <asm/io.h>MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Topeet");//用于存放虚拟地址和物理地址
volatile unsigned long virt_addr, phys_addr;
//用户存放三个寄存器的地址
volatile unsigned long *GPL2CON, *GPL2DAT, *GPL2PUD;static void gpl2_device_init(void)
{//物理地址起始地址0x1100 0100phys_addr = 0x11000100;//0x11000100是GPL2CON的物理地址virt_addr = (unsigned long)ioremap(phys_addr, 0x10);//指定需要操作的寄存器地址GPL2CON = (unsigned long *)(virt_addr + 0x00);GPL2DAT = (unsigned long *)(virt_addr + 0x04);GPL2PUD = (unsigned long *)(virt_addr + 0x08);
}//配置开发板的GPIO寄存器
static void gpl2_configure(void)
{//配置为输出模式*GPL2CON &= 0xFFFFFFF0;*GPL2CON |= 0x00000001;//GPL2PUD &= 0xfff0;//GPL2PUD寄存器,bit[0:1]设为0x03,上拉模式*GPL2PUD |= 0x0003;
}//点灯
static void gpl2_on(void)
{*GPL2DAT |= 0x01;
}//灭灯
static void gpl2_off(void)
{*GPL2DAT &= 0xfe;
}static int led_gpl2_init(void)
{printk(KERN_EMERG "led enter!\n");gpl2_device_init();         //实现IO内存映射gpl2_configure();           //配置GPL2为输出模式
    gpl2_on();printk("led dgp2 open\n");return 0;
}static void led_gpl2_exit(void)
{gpl2_off();printk(KERN_EMERG "led exit!\n");
}module_init(led_gpl2_init);
module_exit(led_gpl2_exit);

TARGET_NAME = ioremap_leds
obj-m += $(TARGET_NAME).oKDIR := /home/topeet/chen/kernel-3.0/iTop4412_Kernel_3.0PWD ?= $(shell pwd)all:make -C $(KDIR) M=$(PWD) modulesclean:rm -rf *.o *.ko *.mod.c *.symvers *.order \.$(TARGET_NAME)*

[root@iTOP-4412]# insmod ioremap_leds.ko
[ 6116.064904] led enter!
[ 6116.065940] led dgp2 open
[root@iTOP-4412]# rmmod ioremap_leds
[ 6122.913415] led exit!
[root@iTOP-4412]# insmod ioremap_leds.ko
[ 6133.090595] led enter!
[ 6133.091567] led dgp2 open
[root@iTOP-4412]# rmmod ioremap_leds
[ 6137.830391] led exit