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驱动层代码
/*************************************************************************> File Name: led_drv.c> Author: XXDK> Email: v.manstein@qq.com > Created Time: Sun 26 Feb 2017 04:28:00 AM PST************************************************************************/#include<linux/init.h>
#include<linux/module.h>
#include<asm/gpio.h>
#include<mach/iomux-mx6q.h>
#include<linux/cdev.h>
#include<linux/fs.h>
#include<linux/device.h>#define SABRESD_GPIO_LED4 IMX_GPIO_NR(3, 21)
#define SABRESD_GPIO_LED5 IMX_GPIO_NR(3, 22)
#define SABRESD_GPIO_LED6 IMX_GPIO_NR(3, 23)
#define LED_ON 1
#define LED_OFF 0struct led_resource {int gpio;char *name;int data;
};static struct cdev led_cdev;
static dev_t led_dev_id;
static struct class *cls;static struct led_resource led_res[] = {[0] = {.gpio = SABRESD_GPIO_LED4,.name = "xxdk_led4",},[1] = {.gpio = SABRESD_GPIO_LED5,.name = "xxdk_led5",},[2] = {.gpio = SABRESD_GPIO_LED6,.name = "xxdk_led6",}
};static int led_open(struct inode* ip, struct file* fp)
{int i;printk("%s\n", __func__);for(i=0; i<ARRAY_SIZE(led_res); i++) {gpio_set_value(led_res[i].gpio, 1);}return 0;}static int led_close(struct inode* ip, struct file* fp)
{int i;printk("%s\n", __func__);for(i=0; i<ARRAY_SIZE(led_res); i++) {gpio_set_value(led_res[i].gpio, 0);}return 0;
}static struct file_operations led_fops = {.owner = THIS_MODULE,.open = led_open,.release = led_close
};
static int led_init(void)
{int i;alloc_chrdev_region(&led_dev_id, 0, 1, "led@xxdk");cdev_init(&led_cdev, &led_fops);cdev_add(&led_cdev, led_dev_id, 1);for(i=0; i<ARRAY_SIZE(led_res); i++) {gpio_request(led_res[i].gpio, led_res[i].name);gpio_direction_output(led_res[i].gpio, 0);}cls = class_create(THIS_MODULE, "xxdk");device_create(cls, NULL, led_dev_id, NULL, "led@xxdk");return 0;
}static void led_exit(void)
{int i;cdev_del(&led_cdev);unregister_chrdev_region(led_dev_id, 1);for(i=0; i<ARRAY_SIZE(led_res); i++) {gpio_set_value(led_res[i].gpio, 0);gpio_free(led_res[i].gpio);} device_destroy(cls, led_dev_id);class_destroy(cls);}module_init(led_init);
module_exit(led_exit);
MODULE_LICENSE("GPL");
应用层代码
/*************************************************************************> File Name: led_test.c> Author: XXDK> Email: v.manstein@qq.com > Created Time: Sun 26 Feb 2017 05:22:08 AM PST************************************************************************/#include<stdio.h>
#include<sys/stat.h>
#include<sys/types.h>
#include<fcntl.h>int main(void)
{int fd;fd = open("/dev/led@xxdk", O_RDWR);if(fd < 0) {printf("open led device failed!\n");return -1;}sleep(3);close(fd);return 0;
}
编译脚本
#Makefil
ifneq ($(KERNELRELEASE),)obj-m += led_drv.o
elseKERNEL_DIR = /opt/EmbedSky/TQIMX6/TQ_COREC/linux_IMX6_CoreC_3.0.35_for_Linux
all:PWD=$(shell pwd)$(MAKE) -C $(KERNEL_DIR) M=$(PWD)
clean:rm -rf .*.cmd *.o *.mod.c *.ko *.tmp_versions module* Module*
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