内核编译常用命令
安装模块
lsmod module_test.ko
创建设备文件
mknod /dev/test c 250 0
查看设备状态
lsmod module_test.ko
查看设备注册信息(分为字符设备和块设备)
cat /proc/devices
知识补充:
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| #include<stdio.h>
int main(void)
{
int i;
static int j;
printf(i);
printf(j);
}
// 注意：这里如果没有指定i值，则打印出来的是随机值
// 如果定义一个静态变量而没有赋值，则打印默认为0
|
虚拟驱动创建流程
首先进入x210_bsp/kernel
make menuconfig
make -j4
cp arch/arm/boot/zImage /tftpboot/ -f
重启开发板查看开发板设备
ls /sys/devices/platform/
cd sys/class/leds
led_test_4编写完成后
编译不报错即可
cd /root/x210_bsp/kernel/drivers/leds/
cp /mnt/hgfs/Myshare/driver/led_test_4/leds-s5pv210.c ./
vi Makefile->
obj-$(CONFIG_LEDS_S5PV210) += leds-s5pv210.o
vi Kconfig更改依赖（添加以下文件）
config LEDS_S5PV210 tristate "LED Support for S5PV210" help This option enables support for on-chip LED drivers found on Marvell Semiconductor 88PM8606 PMIC.
进入到x210_bsp/kernel
执行make menuconfig
可以发现生成了新的配置（Device Drivers-> LED_Support），使能这个
执行make编译
cp arch/arm/boot/zImage /tftpboot/ -f
secureCRT：
cd sys/class/leds
进入LED1,执行
echo 1 > brightness // 灯亮
echo 0 > brightness //灯灭
最后附上源代码：
leds-s5pv210.c
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| #include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <asm/uaccess.h>
#include <mach/gpio-bank.h>
#include <mach/regs-gpio.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include <mach/gpio.h>
#include <linux/leds.h>
#define GPIO_LED1 S5PV210_GPJ0(3)
#define GPIO_LED2 S5PV210_GPJ0(4)
#define GPIO_LED3 S5PV210_GPJ0(5)
#define X210_LED_OFF 1
#define X210_LED_ON 0
struct led_classdev mydev1;
struct led_classdev mydev2;
struct led_classdev mydev3;
void s5pv210_led1_set(struct led_classdev *led_cdev,enum led_brightness value)
{
printk(KERN_INFO "s5pv210_led1_set\n");
if(value == LED_OFF)
{
gpio_set_value(GPIO_LED1,X210_LED_OFF);
}
else
{
gpio_set_value(GPIO_LED1,X210_LED_ON);
}
}
void s5pv210_led2_set(struct led_classdev *led_cdev,enum led_brightness value)
{
printk(KERN_INFO "s5pv210_led2_set\n");
if(value == LED_OFF)
{
gpio_set_value(GPIO_LED2,X210_LED_OFF);
}
else
{
gpio_set_value(GPIO_LED2,X210_LED_ON);
}
}
void s5pv210_led3_set(struct led_classdev *led_cdev,enum led_brightness value)
{
printk(KERN_INFO "s5pv210_led3_set\n");
if(value == LED_OFF)
{
gpio_set_value(GPIO_LED3,X210_LED_OFF);
}
else
{
gpio_set_value(GPIO_LED3,X210_LED_ON);
}
}
static int __init s5pv210_led_init(void)
{
int ret = -1;
// 申请GPIO
if(gpio_request(GPIO_LED1,"led1_gpj0.3"))
{
printk(KERN_ERR "gpio_request failed.\n");
}
else
{
gpio_direction_output(GPIO_LED1,1);
}
mydev1.name = "led1";
mydev1.brightness = 0;
mydev1.brightness_set = s5pv210_led1_set;
ret = led_classdev_register(NULL,&mydev1);
if(ret < 0)
{
printk(KERN_ERR "led_classdev_register failed.\n");
return ret;
}
mydev2.name = "led2";
mydev2.brightness = 0;
mydev2.brightness_set = s5pv210_led2_set;
ret = led_classdev_register(NULL,&mydev2);
if(ret < 0)
{
printk(KERN_ERR "led_classdev_register failed.\n");
return ret;
}
mydev3.name = "led3";
mydev3.brightness = 0;
mydev3.brightness_set = s5pv210_led3_set;
ret = led_classdev_register(NULL,&mydev3);
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(&mydev1);
led_classdev_unregister(&mydev2);
led_classdev_unregister(&mydev3);
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");
MODULE_AUTHOR("WYQ");
MODULE_DESCRIPTION("module_test");
|
Makefile
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| #KERN_VER = $(shell uname -r)
#KERN_DIR = /lib/modules/$(KERN_VER)/build
KERN_DIR = /root/x210_bsp/kernel
obj-m += leds-s5pv210.o
all:
make -C $(KERN_DIR) M=`pwd` modules
.PHONY:clean
clean:
make -C $(KERN_DIR) M=`pwd` modules clean
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