Smart210---LED驅動

標籤：

　　經過幾天的學習，終於linux驅動的基本架構弄清楚了。。。真的很艱辛，，，不過終於還是熬過來了，雖然還是最基礎的，，，

今晚也完成了我第一個linux驅動，，，心裡還是有點小興奮的，哈哈O(∩_∩)O

 

直接上驅動來源程式吧：：：

 我的開發板是Smart210，根據原理圖，IO口輸出0 led亮，輸出1 led滅 

#include <linux/kernel.h>#include <linux/module.h>#include <linux/miscdevice.h>#include <linux/fs.h>#include <linux/types.h>#include <linux/moduleparam.h>#include <linux/slab.h>#include <linux/ioctl.h>#include <linux/cdev.h>#include <linux/delay.h>   #include <mach/gpio.h>#include <mach/regs-gpio.h>#include <plat/gpio-cfg.h>#define DEVICE_NAME "leds"  /* 應用程式執行ioctl(fd, cmd, arg)時的第2個參數 */  /*the second parameter that application program execute*/  #define IOCTL_GPIO_ON         1  #define IOCTL_GPIO_OFF        0  /* 用來指定LED所用的GPIO引腳 */  /*appoint the pin the LED will use*/  static unsigned long leds_table [] =  {          S5PV210_GPJ2(0),          S5PV210_GPJ2(1),          S5PV210_GPJ2(2),          S5PV210_GPJ2(3),          //arch\arm\mach-s5pv210\include\mach\gpio.h  };  static char leds_name[][4]={{"LED1"},{"LED2"},{"LED2"},{"LED3"}};  #define LED_NUM                ARRAY_SIZE(leds_table)   /**  *函數功能：開啟/dev/led裝置  *fuction:open /dev/leds device  *裝置名稱是：/dev/leds  *devce name: /dev/leds  **/  static int my_led_open(struct inode *inode, struct file *file)  {       int i;       int err;          for (i = 0; i < LED_NUM; i++)       {           err = gpio_request(leds_table[i], leds_name[i]);                      //drivers/gpio/gpiolib.c           if(err)           {              printk(KERN_ERR "failed to request S5PV210_GPH2(%d) for LED%d \n",i-1,i);              return err;           }       }          for (i = 0; i < LED_NUM; i++)       {         s3c_gpio_cfgpin(leds_table[i], S3C_GPIO_OUTPUT);//Configuration pin function:input output multiplex         gpio_set_value(leds_table[i], 1);//Set the pin level          //arch\arm\plat-samsung\gpio-config.c//          gpio_direction_output(leds_table[i], 0);//write a value to GPIO port ,also set the port to output mode//          gpio_set_value(leds_table[i], 0);          //drivers/gpio/gpiolib.c          }      printk(KERN_INFO "LEDs driver successfully close\n");       return 0;  } static long my_led_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) {    arg -= 1;    if(arg > LED_NUM) {        return -EINVAL;    }    switch(cmd) {        case IOCTL_GPIO_ON:            printk("led light\n");            gpio_set_value(leds_table[arg], 0);        break;        case IOCTL_GPIO_OFF:            printk("led no light\n");            gpio_set_value(leds_table[arg], 1);        break;        default:            printk("led failed\n");            return -EINVAL;    }    return 0; } static int my_led_close(struct inode * inode,struct file * file) {     int i;    for(i= 0; i < LED_NUM; i++)        gpio_free(leds_table[i]);    printk(KERN_EMERG"close success\n");    return 0; }struct file_operations my_led_ops = {    .owner = THIS_MODULE,    .open  = my_led_open,    .unlocked_ioctl = my_led_ioctl,    .release = my_led_close,};static struct miscdevice led_misc = {    .minor = MISC_DYNAMIC_MINOR,    .name = DEVICE_NAME,    .fops  = &my_led_ops,};static int __init my_led_init(void){    int ret;    ret = misc_register(&led_misc);    if(ret) {        printk(KERN_INFO"misc_register failed\n");    }    printk(KERN_INFO"misc_register sucessed\n");        return 0;}static void __exit my_led_exit(void) {    int i;    misc_deregister(&led_misc);    for(i= 0; i < LED_NUM; i++)        gpio_free(leds_table[i]);    printk(KERN_INFO "LEDs driver successfully exit\n");}module_init(my_led_init);module_exit(my_led_exit);MODULE_LICENSE("GPL");MODULE_AUTHOR("qigaohua");　

應用程式：

#include <stdio.h>#include <stdlib.h>#include <fcntl.h>#include <sys/time.h>#define IOCTL_GPIO_ON           1#define IOCTL_GPIO_OFF          0int main(int argc, char **argv){    int fd;    fd = open("/dev/leds",0);    if(fd < 0) {        printf("/dev/leds open failed\n");        exit(1);    }        do {        printf("/dev/leds open sucessed\n");        ioctl(fd, IOCTL_GPIO_ON, 1);        ioctl(fd, IOCTL_GPIO_OFF, 2);        ioctl(fd, IOCTL_GPIO_OFF, 3);        ioctl(fd, IOCTL_GPIO_OFF, 4);        sleep(1);        ioctl(fd, IOCTL_GPIO_ON, 1);        ioctl(fd, IOCTL_GPIO_ON, 2);        ioctl(fd, IOCTL_GPIO_OFF, 3);        ioctl(fd, IOCTL_GPIO_OFF, 4);                sleep(1);        ioctl(fd, IOCTL_GPIO_ON, 1);        ioctl(fd, IOCTL_GPIO_ON, 2);        ioctl(fd, IOCTL_GPIO_ON, 3);        ioctl(fd, IOCTL_GPIO_OFF, 4);                sleep(1);        ioctl(fd, IOCTL_GPIO_ON, 1);        ioctl(fd, IOCTL_GPIO_ON, 2);        ioctl(fd, IOCTL_GPIO_ON, 3);        ioctl(fd, IOCTL_GPIO_ON, 4);                sleep(1);        ioctl(fd, IOCTL_GPIO_OFF, 1);        ioctl(fd, IOCTL_GPIO_OFF, 2);        ioctl(fd, IOCTL_GPIO_OFF, 3);        ioctl(fd, IOCTL_GPIO_OFF, 4);    }while(0);    close(fd);    return 0;}

 

Smart210---LED驅動