驅動層代碼

/*************************************************************************	> 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");應用層代碼
/*************************************************************************	> 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;}編譯腳本
#Makefilifneq ($(KERNELRELEASE),)	obj-m += led_drv.oelse	KERNEL_DIR = /opt/EmbedSky/TQIMX6/TQ_COREC/linux_IMX6_CoreC_3.0.35_for_Linuxall:	PWD=$(shell pwd)	$(MAKE) -C $(KERNEL_DIR) M=$(PWD)clean:	rm -rf .*.cmd *.o *.mod.c *.ko *.tmp_versions module* Module*endif