驱动学习8--gpiolib的使用

驱动

#include <linux/module.h>       // module_init  module_exit#include <linux/init.h>         // __init   __exit#include <linux/fs.h>#include <linux/leds.h>         //struct led_classdev#include <mach/regs-gpio.h>     //gpio virtual address#include <mach/gpio-bank.h>     //gpio virtual address#include <linux/io.h>#include <linux/ioport.h>#include <mach/gpio.h>          //S5PV210_GPxx(x)#define GPIO_LED1   S5PV210_GPJ0(3)#define GPIO_LED2   S5PV210_GPJ0(4)#define GPIO_LED3   S5PV210_GPJ0(5)static struct led_classdev led_cdev1;           // 定义结构体变量static struct led_classdev led_cdev2;           // 定义结构体变量static struct led_classdev led_cdev3;           // 定义结构体变量static void s5pv210_led_set1(struct led_classdev *led_cdev,enum led_brightness value){    if(value == LED_OFF)        gpio_set_value(GPIO_LED1,1);    else        gpio_set_value(GPIO_LED1,0);    printk(KERN_INFO "value = %d\n",value);}static void s5pv210_led_set2(struct led_classdev *led_cdev,enum led_brightness value){    if(value == LED_OFF)        gpio_set_value(GPIO_LED2,1);    else        gpio_set_value(GPIO_LED2,0);    printk(KERN_INFO "value = %d\n",value);}static void s5pv210_led_set3(struct led_classdev *led_cdev,enum led_brightness value){    if(value == LED_OFF)        gpio_set_value(GPIO_LED3,1);    else        gpio_set_value(GPIO_LED3,0);    printk(KERN_INFO "value = %d\n",value);}static int __init s5pv210_led_init(void){    int ret = -1;    ret = gpio_request(GPIO_LED1, "GPJ0");    if(ret)        printk("gpio_request1 fail\n");    gpio_direction_output(GPIO_LED1, 1);    ret = gpio_request(GPIO_LED2, "GPJ0");    if(ret)        printk("gpio_request2 fail\n");    gpio_direction_output(GPIO_LED2, 1);    ret = gpio_request(GPIO_LED3, "GPJ0");    if(ret)        printk("gpio_request3 fail\n");    gpio_direction_output(GPIO_LED3, 1);    led_cdev1.name = "led1";    led_cdev1.max_brightness = 1000;/*设置最大亮度*/    led_cdev1.brightness = 0;/*设置亮度初始值 */    led_cdev1.brightness_set = s5pv210_led_set1;/*具体操控硬件*/    ret = led_classdev_register(NULL, &led_cdev1);    if (ret < 0)     {        printk(KERN_ERR "led_classdev_register failed\n");        return ret;    }    led_cdev2.name = "led2";    led_cdev2.max_brightness = 1000;/*设置最大亮度*/    led_cdev2.brightness = 0;/*设置亮度初始值 */    led_cdev2.brightness_set = s5pv210_led_set2;/*具体操控硬件*/    ret = led_classdev_register(NULL, &led_cdev2);    if (ret < 0)     {        printk(KERN_ERR "led_classdev_register failed\n");        return ret;    }    led_cdev3.name = "led3";    led_cdev3.max_brightness = 1000;/*设置最大亮度*/    led_cdev3.brightness = 0;/*设置亮度初始值 */    led_cdev3.brightness_set = s5pv210_led_set3;/*具体操控硬件*/    ret = led_classdev_register(NULL, &led_cdev3);    if (ret < 0)     {        printk(KERN_ERR "led_classdev_register failed\n");        return ret;    }    return 0;}static void __exit s5pv210_led_exit(void){    led_classdev_unregister(&led_cdev1);    led_classdev_unregister(&led_cdev2);    led_classdev_unregister(&led_cdev3);    gpio_free(GPIO_LED1);    gpio_free(GPIO_LED2);    gpio_free(GPIO_LED3);}module_init(s5pv210_led_init);module_exit(s5pv210_led_exit);MODULE_LICENSE("GPL");/*描述模块的许可证*/MODULE_AUTHOR("Xin-Ya Zhu<[e-mail]>");/*描述模块的作者*/MODULE_DESCRIPTION("s5pv210 led driver");/*描述模块的介绍信息*/  MODULE_ALIAS("s5pv210_leds");/*描述模块的别名信息*/

应用

#include <stdio.h>#include <string.h>#include <stdlib.h>#include <sys/types.h>  //open close#include <sys/stat.h>#include <fcntl.h>#define FILE "/sys/class/leds/led1/brightness"#define LED_ON  "1"#define LED_OFF "0"int main(void){    int fd = -1;    char buf[100] = {0};    fd = open(FILE,O_RDWR);    if(fd<0)    {        printf("open error.\n");        return -1;    }    write(fd,LED_ON,strlen(LED_ON));    sleep(1);    write(fd,LED_OFF,strlen(LED_OFF));    sleep(1);    write(fd,LED_ON,strlen(LED_ON));    sleep(1);    write(fd,LED_OFF,strlen(LED_OFF));    sleep(1);    close(fd);    return 0;}