GPIOS驱动

小编 2026-06-18 阅读:1436 评论:0

1、去掉占用GPIO的驱动去掉占用调用的GPIO驱动，包括leds，buzzer，camera ov5640，WIFI mt6620 VIDEO_OV5640 – D...

1、去掉占用GPIO的驱动

去掉占用调用的GPIO驱动，包括leds，buzzer，camera ov5640，WIFI

mt6620

VIDEO_OV5640

– Device Drivers

– Multimedia support(MEDIA_SUPPORT [=y])

– Video capture adapters(VIDEO_CAPTURE_DRIVERS [=y])（去掉）

$\"\"$

MTK_COMBO_CHIP_MT6620

– Device Drivers

– MediaTek Connectivity Combo Chip Config

– MediaTek Connectivity Combo Chip Support (MTK_COMBO [=y])（去掉）

– Select Chip (<choice> [=y])

$\"\"$

Enable LEDS config

--Device Drivers

--Character devices

--Enable LEDS config

Enable BUZZER config

--Device Drivers

--Character devices

--Enable BUZZER config

$\"\"$

/*led的两个IO，网络是KP_COL0，VDD50_EN*/

KP_COL0 GPL2_0

VDD50_EN GPK1_1

GPL2CON 0x11000100

GPL2DAT 0x11000104

GPK1CON 0x1100060

GPK1DAT 0x11000064

/*蜂鸣器的1个IO，网络是MOTOR_PWM*/

MOTOR_PWM GPD0_0

/*矩阵键盘的8个IO，网络是CHG_FLT，HOOK_DET，CHG_UOK，XEINT14_BAK，

GM_INT1，6260_GPIO1，CHG_COK，XEINT29/KP_ROW13/ALV_DBG25*/

CHG_FLT GPX1_0

HOOK_DET GPX1_3

CHG_UOK GPX1_5

XEINT14_BAK GPX1_6

GM_INT1 GPX3_0

6260_GPIO1 GPX2_6

CHG_COK GPX2_7

XEINT29/KP_ROW13/ALV_DBG25 GPX3_5

/*摄像头的14个IO，网络是CAM_MCLK，CAM2M_RST，CAM2M_PWDN，

CAM_D5，CAM_D7，CAM_D6，CAM_D4，CAM_D3，CAM_D2，CAM_D1，

CAM_PCLK，CAM_D0，CAM_VSYNC，CAM_HREF。

I2C_SDA7，I2C_SCL7也是可以设置为GPIO，不过总线一般不要去动它*/

CAM_MCLK GPJ1_3

CAM2M_RST GPL0_1

CAM2M_PWDN GPL0_3

CAM_D5 GPJ1_0

CAM_D7 GPJ1_2

CAM_D6 GPJ1_1

CAM_D4 GPJ0_7

CAM_D3 GPJ0_6

CAM_D2 GPJ0_5

CAM_D1 GPJ0_4

CAM_PCLK GPJ0_0

CAM_D0 GPJ0_3

CAM_VSYNC GPJ0_1

CAM_HREF GPJ0_2

/*WIFI模块的7个IO，WIFI_D3，WIFI_CMD，WIFI_D1，WIFI_CLK，WIFI_D0，WIFI_D2，GPC1_1*/

/*串口RX和TX等也是可以设置为GPIO，一般不要动它*/

WIFI_D3 GPK3_6

WIFI_CMD GPK3_1

WIFI_D1 GPK3_4

WIFI_CLK GPK3_0

WIFI_D0 GPK3_3

WIFI_D2 GPK3_5

GPC1_1 GPC1_1

数组中有32个引出到端子或者模块的IO，还有类似sd卡等也是可以作为GPIO，其它引到连接器但是没有使用的GPIO等等

测试源码：

#include <linux/init.h>
#include <linux/module.h>

/*驱动注册的头文件，包含驱动的结构体和注册和卸载的函数*/
#include <linux/platform_device.h>
/*注册杂项设备头文件*/
#include <linux/miscdevice.h>
/*注册设备节点的文件结构体*/
#include <linux/fs.h>

/*Linux中申请GPIO的头文件*/
#include <linux/gpio.h>
/*三星平台的GPIO配置函数头文件*/
/*三星平台EXYNOS系列平台，GPIO配置参数宏定义头文件*/
#include <plat/gpio-cfg.h>
#include <mach/gpio.h>
/*三星平台4412平台，GPIO宏定义头文件*/
#include <mach/gpio-exynos4.h>

#define DRIVER_NAME \"hello_ctl\"
#define DEVICE_NAME \"hello_gpio\"


MODULE_LICENSE(\"Dual BSD/GPL\");
MODULE_AUTHOR(\"SKYFALL\");




/*led的两个IO，网络是KP_COL0，VDD50_EN*/
/*蜂鸣器的1个IO，网络是MOTOR_PWM*/

/*矩阵键盘的8个IO，网络是CHG_FLT，HOOK_DET，CHG_UOK，XEINT14_BAK，
GM_INT1，6260_GPIO1，CHG_COK，XEINT29/KP_ROW13/ALV_DBG25*/

/*摄像头的14个IO，网络是CAM_MCLK，CAM2M_RST，CAM2M_PWDN，
CAM_D5，CAM_D7，CAM_D6，CAM_D4，CAM_D3，CAM_D2，CAM_D1，
CAM_PCLK，CAM_D0，CAM_VSYNC，CAM_HREF。
I2C_SDA7，I2C_SCL7也是可以设置为GPIO，不过总线一般不要去动它*/

/*WIFI模块的7个IO，WIFI_D3，WIFI_CMD，WIFI_D1，WIFI_CLK，WIFI_D0，WIFI_D2，GPC1_1*/
/*串口RX和TX等也是可以设置为GPIO，一般不要动它*/

/*数组中有32个引出到端子或者模块的IO，还有类似sd卡等也是可以作为GPIO，
其它引到连接器但是没有使用的GPIO等等*/
/*SCP管脚编号和POP的稍微有点不同，下面是SCP的*/
static int led_gpios[] = {
	EXYNOS4_GPL2(0),EXYNOS4_GPK1(1),
	EXYNOS4_GPD0(0),
	
	EXYNOS4_GPX1(0),EXYNOS4_GPX1(3),EXYNOS4_GPX1(5),EXYNOS4_GPX1(6),
	EXYNOS4_GPX3(0),EXYNOS4_GPX2(6),EXYNOS4_GPX2(7),EXYNOS4_GPX3(5),
	
	EXYNOS4212_GPJ1(3),EXYNOS4_GPL0(1),EXYNOS4_GPL0(3),EXYNOS4212_GPJ1(0),
	EXYNOS4212_GPJ1(2),EXYNOS4212_GPJ1(1),EXYNOS4212_GPJ0(7),EXYNOS4212_GPJ0(6),
	EXYNOS4212_GPJ0(5),EXYNOS4212_GPJ0(4),EXYNOS4212_GPJ0(0),EXYNOS4212_GPJ0(3),
	EXYNOS4212_GPJ0(1),EXYNOS4212_GPJ0(2),
	
	EXYNOS4_GPK3(6),EXYNOS4_GPK3(1),EXYNOS4_GPK3(4),EXYNOS4_GPK3(0),
	EXYNOS4_GPK3(3),EXYNOS4_GPK3(5),EXYNOS4_GPC1(1),
};

//#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))

#define LED_NUM		ARRAY_SIZE(led_gpios)


static long hello_ioctl( struct file *files, unsigned int cmd, unsigned long arg){
	printk(\"cmd is %d,arg is %d\\n\",cmd,arg);
	
	switch(cmd)
	{
		case 0:
		case 1:
			if (arg > LED_NUM) {
				return -EINVAL;
			}

			gpio_set_value(led_gpios[arg], cmd);
			break;

		default:
			return -EINVAL;
	}
	
	gpio_set_value(led_gpios[2], 0);
	
return 0;
}

static int hello_release(struct inode *inode, struct file *file){

	printk(\"%s,%d\\n\",__func__,__LINE__);
	printk(KERN_EMERG \"hello release\\n\");
	return 0;
}

static int hello_open(struct inode *inode, struct file *file){
	
	printk(\"%s,%d\\n\",__func__,__LINE__);
	printk(KERN_EMERG \"hello open\\n\");
	return 0;
}

static struct file_operations hello_ops = {
	.owner = THIS_MODULE,
	.open = hello_open,
	.release = hello_release,
	.unlocked_ioctl = hello_ioctl,
};

static  struct miscdevice hello_dev = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = DEVICE_NAME,
	.fops = &hello_ops,
};


static int hello_probe(struct platform_device *pdv){
	int ret,i;
	
	printk(KERN_EMERG \"\\tinitialized\\n\");
	
	for(i=0; i<LED_NUM; i++)
	{
		ret = gpio_request(led_gpios[i], \"LED\");
		if (ret) {
			printk(\"%s: request GPIO %d for LED failed, ret = %d\\n\", DRIVER_NAME,
					i, ret);
			}
		else{
			s3c_gpio_cfgpin(led_gpios[i], S3C_GPIO_OUTPUT);
			gpio_set_value(led_gpios[i], 1);			
		}
	}
//单独将蜂鸣器的关掉，为的是不让它开始鸣叫，要不太吵！
	gpio_set_value(led_gpios[2], 0);
	
	printk(\"%s,%d\\n\",__func__,__LINE__);
	misc_register(&hello_dev);
	if(ret<0)
	{
		printk(\"leds:register device failed!\\n\");
		goto exit;
	}
	
exit:
	misc_deregister(&hello_dev);
	return ret;
return 0;
}

static int hello_remove(struct platform_device *pdv){
	int i;
	
	printk(KERN_EMERG \"\\tremove\\n\");
	
	for(i=0; i<LED_NUM; i++)
	{
		gpio_free(led_gpios[i]);
	}
	
	misc_deregister(&hello_dev);
	return 0;
}

static void hello_shutdown(struct platform_device *pdv){
	
	;
}

static int hello_suspend(struct platform_device *pdv,pm_message_t pmt){
	
	return 0;
}

static int hello_resume(struct platform_device *pdv){
	
	return 0;
}

struct platform_driver hello_driver = {
	.probe = hello_probe,
	.remove = hello_remove,
	.shutdown = hello_shutdown,
	.suspend = hello_suspend,
	.resume = hello_resume,
	.driver = {
		.name = DRIVER_NAME,
		.owner = THIS_MODULE,
	}
};


static int hello_init(void)
{
	int DriverState;
	printk(\"%s,%d\\n\",__func__,__LINE__);
	printk(KERN_EMERG \"HELLO WORLD enter!\\n\");
	DriverState = platform_driver_register(&hello_driver);
	
	printk(KERN_EMERG \"\\tDriverState is %d\\n\",DriverState);
	return 0;
}


static void hello_exit(void)
{
	printk(\"%s,%d\\n\",__func__,__LINE__);
	printk(KERN_EMERG \"HELLO WORLD exit!\\n\");
	
	void free_irq(unsigned int irq,void *dev_id);
	
	platform_driver_unregister(&hello_driver);	
}

module_init(hello_init);
module_exit(hello_exit);

Makefile文件参考相关博文，生成驱动模块。

应用程序测试源码：

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <string.h>

#define GPIOS 32


int main(int argc , char *argv[]){
	int fd,i,cmd=2;
	char *hello_node = \"/dev/hello_gpio\";
	char *cmd0 = \"0\"; 
	char *cmd1 = \"1\";
	
	printf(\"argv[0] is %s;argv[1] is %s;\",argv[0],argv[1]);
	
	if(strcmp(argv[1], cmd0) == 0){
		cmd = 0;
		printf(\"cmd is 0!\\n\");
	}
	if(strcmp(argv[1], cmd1) == 0){
		cmd = 1;
		printf(\"cmd is 1!\\n\");
	}
	
/*O_RDWR读写方式,O_NDELAY非阻塞方式*/	
	if((fd = open(hello_node,O_RDWR|O_NDELAY))<0){
		printf(\"APP open %s failed!\\n\",hello_node);
	}
	else{
		printf(\"APP open %s success!\\n\",hello_node);
		
		for(i=0;i<GPIOS;i++){
			ioctl(fd,cmd,i);
			printf(\"APP ioctl %s ,cmd is %d,i is %d!\\n\",hello_node,cmd,i);
		}
	}
	
	close(fd);
return 0;
}