imx6q led灯驱动及测试代码（自动创建设备文件v1）

驱动层代码

/*************************************************************************
	> File Name: led_drv.c
	> Author: XXDK
	> Email: [email protected] 
	> Created Time: Sun 26 Feb 2017 04:28:00 AM PST
 ************************************************************************/

#include
#include
#include
#include
#include
#include
#include

#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 0

struct 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

应用层代码

/*************************************************************************
	> File Name: led_test.c
	> Author: XXDK
	> Email: [email protected] 
	> Created Time: Sun 26 Feb 2017 05:22:08 AM PST
 ************************************************************************/

#include
#include
#include
#include

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;
}

Makefile代码

#Makefile
ifneq ($(KERNELRELEASE),)
	obj-m += led_drv.o
else
	KERNEL_DIR = /opt/EmbedSky/TQIMX6/TQ_COREC/linux_IMX6_CoreC_3.0.35_for_Linux
all:
	PWD=$(shell pwd)
	$(MAKE) -C $(KERNEL_DIR) M=$(PWD)
clean:
	rm -rf .*.cmd *.o *.mod.c *.ko *.tmp_versions module* Module*
endif