S5PV210 Android LED灯驱动程序

最新推荐文章于 2024-09-27 11:25:36 发布

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最新推荐文章于 2024-09-27 11:25:36 发布

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分类专栏： SAMSUNG S5PV210 文章标签： android module struct class makefile output

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本文介绍了如何编译S5PV210平台上Android系统的LED驱动程序。编译驱动时需指定内核源码的中间文件，并使用arm-eabi-gcc 4.4.3作为编译器。测试程序编译需添加-static选项，采用arm-linux-gcc 4.4.1。内容来源于网络转载。

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驱动文件：hello.c
 
/************************************************
 LED的驱动，在Real210A开发板上做测试
 
维护记录：  2011-10-31  V1.0    
 
linux内核：2.6.35.7
 
驱动用法：
         设备名称：Real210-led
         点亮一个灯：LED_ON
         熄灭一个灯：LED_OFF
         点亮所有灯：ALL_LED_ON
         熄灭所有灯：ALL_LED_OFF
 *************************************************/
 #include<linux/init.h>
 #include<linux/module.h>
 
 #include <linux/kernel.h>
 #include <linux/fs.h>
 #include <linux/delay.h>
 #include <asm/irq.h>
 #include <mach/regs-gpio.h>
 #include <mach/hardware.h>
 #include <linux/device.h>
 #include <linux/gpio.h>
 
 #define DEVICE_NAME    "Real210-led"    /* 设备名称 */        
 static int LED_Major = 0;            /* 主设备号 ,系统自动分配*/
 
 #define LED_OFF             0
 #define LED_ON             1
 #define ALL_LED_OFF      3
 #define ALL_LED_ON       4
 
/* 用来指定LED所用的GPIO引脚 */
 static unsigned long led_table [] =
 {
     //S5PV210_GPH0(_nr);
     //在头文件“～/kernel/arch/arm/mach-s5pv210/include/mach/”
 
     S5PV210_GPH0(6),
     S5PV210_GPH0(7),
     S5PV210_GPH0(4),
     S5PV210_GPH0(5),
 };
 
static int Real210_led_open(struct inode *inode, struct file *file)
 {
 //    MOD_INC_USE_COUNT;
     printk("Real210-LED Driver Open Called!\n");
     return 0;
 }
 
static int Real210_led_release(struct inode *inode, struct file *file)
 {
 //    MOD_DEC_USE_COUNT;
     printk("Real210-LED Driver Release Called!\n");
     return 0;
 }
 
static int Real210_led_ioctl( struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 {
     int i;
     if (arg > 4)
     {
         return -EINVAL;
     }
     switch(cmd)
     {
         case LED_ON:  //set the pin
             gpio_set_value (led_table[arg], 0);
             break;
 
         case LED_OFF:  //clr the pin
             gpio_set_value (led_table[arg], 1);
             break;
             
         case ALL_LED_ON:  //set all pin
             for (i = 0; i < 4; i++)
                 gpio_set_value (led_table[i], 0);
             break;
             
         case ALL_LED_OFF:  //clr all pin
             for (i = 0; i < 4; i++)
                 gpio_set_value (led_table[i], 1);
             break;
 
         default:
             return -EINVAL;
     }
 }
 
static struct file_operations Real210_led_fops =
 {
     .owner  =   THIS_MODULE,
     .open   =   Real210_led_open, 
     .release =  Real210_led_release,
     .ioctl  =   Real210_led_ioctl,
 };
 
static struct class *led_class;
 
static int __init Real210_led_init(void)
 {
 
    printk("Real210 LED DRIVER MODULE INIT\n");
 
    LED_Major = register_chrdev(0, DEVICE_NAME, &Real210_led_fops);
     if (LED_Major < 0)
     {
         printk(DEVICE_NAME " can't register major number\n");
         return LED_Major;
     }
     printk("register Real210-LED Driver OK! Major = %d\n", LED_Major);
 
     led_class = class_create(THIS_MODULE, DEVICE_NAME);
     if(IS_ERR(led_class))
     {
         printk("Err: failed in Real210-LED class. \n");
         return -1;
     }
 
     device_create(led_class, NULL, MKDEV(LED_Major, 0), NULL, DEVICE_NAME);
 
     //IO初始化
     
     //IO方向配置
     gpio_direction_output (S5PV210_GPH0(6), 1);
     gpio_direction_output (S5PV210_GPH0(7), 1); 
     gpio_direction_output (S5PV210_GPH0(4), 1); 
     gpio_direction_output (S5PV210_GPH0(5), 1);  
     //IO初始化
     gpio_set_value (S5PV210_GPH0(6), 1); 
     gpio_set_value (S5PV210_GPH0(7), 0); 

     printk(DEVICE_NAME " initialized\n");
     return 0;
 }
 
static void __exit Real210_led_exit(void)
 {
     printk("Real210 LED DRIVER MODULE EXIT\n");
     unregister_chrdev(LED_Major, DEVICE_NAME);
     device_destroy(led_class, MKDEV(LED_Major, 0));
     class_destroy(led_class);
 }
 
 module_init(Real210_led_init);
 module_exit(Real210_led_exit);
 
 //MODULE_LICENSE("Dual BSD/GP");
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("wzl");
 MODULE_DESCRIPTION("This is an example of hello drivers");
 MODULE_ALIAS("A simplest module.");

Makefile文件：

ifneq ($(KERNELRELEASE),)
 
obj-m := hello.o
 
else
 
KDIR := /home/light/A8Android/android_gingerbread_realv210_ver_1_0/out/target/product/smdkv210/obj/KERNEL
 
all:
     make -C $(KDIR) M=$(PWD) modules ARCH=arm CROSS_COMPILE=arm-eabi-
 
clean:
     rm -f *.ko *.o *.mod.o *.mod.c *.symvers
 
endif

测试文件:led.c

 #include<stdio.h>
 #include<stdlib.h>
 #include<unistd.h>
 #include <sys/ioctl.h>
 
 int main(int argc, char **argv)
 {
     unsigned int on;
     unsigned int led_num;
     int fd;
     printf("Enter the test led !\n");
     fd = open("/dev/Real210-led", 0);
     if (fd < 0)
     {
         perror("open device led");
         exit(1);
     }
 

    ioctl(fd, 1, 0);    //可修改本句代码
 

    close(fd);
     return 0;
 }

Makefile文件：

CROSS=arm-linux-
 
all: led
 
led:led.c
     $(CROSS)gcc -o led led.c -static
     $(CROSS)strip led
clean:
     @rm -vf led *.o *~

说明:

编译驱动时候应该指明内核源码编译后的中间文件。编译器用的是arm-eabi-gcc 4.4.3

编译测试程序时应该添加-static声明。编译器arm-linux-gcc 4.4.1

转载自：http://blog.youkuaiyun.com/bmbm546/article/details/6927986