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内核裁剪,将自己写的驱动加入内核及按键驱动的代码(arm TQ2440)

2016-03-02 20:15 435 查看
1.在/opt/下解压LINUX内核文件

2.cd /opt/opt/EmbedSky/linux-2.6.30.4/drivers/input/keyboard

3.gedit Kconfig

4.config TQ2440_IRQ_BUTTON

tristate "EmbedSky TQ2440 Board user buttons"

depends on ARCH_S3C2440

default y if ARCH_S3C2440

help

IRQ Button for EmbedSky TQ2440 Board.

拷贝楼上粘贴如下

config BLACK //这里改改

tristate "EmbedSky" //这里也改改

depends on ARCH_S3C2440

default y if ARCH_S3C2440

help

IRQ Button for EmbedSky TQ2440 Board.

4.gedit Makefile

最后一行 obj-$(CONFIG_BLACK/*这里改成自己的命名*/) += keyIrq.o/*这里改成自己的.o*/

5.cd 到linux-2.6.30.4这里进行裁剪系统,make menuconfig->Device Drivers->Input device support->Keybords->去掉系统的*,把自己的加上*(在最后一个) 用空格来切换添加删除

6.cp 自己代码到 /drivers/input/keyboard下

7.cp config_EmbedSky_W43 .config

8.cp config_EmbedSky_W43 config

9../config

10.make clean;make 已成功一大半

11.将编译得到的zImage.bin内核文件烧写进[color=rgb(68, 68, 68) !important]ARM板,要清除原来的,UBOOT,系统也要重新烧写(9,1,3,6
来一遍)

12.驱动代码如下(记得改makefile)

#include <linux/miscdevice.h>

#include <linux/delay.h>

#include <asm/irq.h>

#include <mach/regs-gpio.h>

#include <mach/hardware.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/mm.h>

#include <linux/fs.h>

#include <linux/types.h>

#include <linux/delay.h>

#include <linux/moduleparam.h>

#include <linux/slab.h>

#include <linux/errno.h>

#include <linux/ioctl.h>

#include <linux/cdev.h>

#include <linux/string.h>

#include <linux/list.h>

#include <linux/pci.h>

#include <linux/gpio.h>

#include <asm/uaccess.h>

#include <asm/atomic.h>

#include <asm/unistd.h>

#include <linux/delay.h>

#include <linux/irq.h>

#include <asm/uaccess.h>

#include <asm/irq.h>

#include <asm/io.h>

#include <linux/module.h>

#include <linux/device.h> //class_create

#include <mach/regs-gpio.h> //S3C2410_GPF1

//#include <asm/arch/regs-gpio.h>

#include <mach/hardware.h>

//#include <asm/hardware.h>

#include <linux/interrupt.h> //wait_event_interruptible

/* 定义并初始化等待队列头 */

static DECLARE_WAIT_QUEUE_HEAD(button_waitq);

static struct class *thirddrv_class;

static struct device *thirddrv_device;

static struct pin_desc{

unsigned int pin;

unsigned int key_val;

};

static struct pin_desc pins_desc[4] = {

{S3C2410_GPF1,0x01},

{S3C2410_GPF4,0x02},

{S3C2410_GPF2,0x03},

{S3C2410_GPF0,0x04},

};

static int ev_press = 0;

/* 键值: 按下时, 0x01, 0x02, 0x03, 0x04 */

/* 键值: 松开时, 0x81, 0x82, 0x83, 0x84 */

static unsigned char key_val;

int major;

/* 用户中断处理函数 */

static irqreturn_t buttons_irq(int irq, void *dev_id)

{

struct pin_desc *pindesc = (struct pin_desc *)dev_id;

unsigned int pinval;

pinval = s3c2410_gpio_getpin(pindesc->pin);

if(pinval)

{

/* 松开 */

key_val = 0x80 | (pindesc->key_val);

}

else

{

/* 按下 */

key_val = pindesc->key_val;

}

ev_press = 1; /* 表示中断已经发生 */

wake_up_interruptible(&button_waitq); /* 唤醒休眠的进程 */

return IRQ_HANDLED;

}

static int third_drv_open(struct inode * inode, struct file * filp)

{

/* K1 ---- EINT1,K2 ---- EINT4,K3 ---- EINT2,K4 ---- EINT0

* 配置GPF1、GPF4、GPF2、GPF0为相应的外部中断引脚

* IRQT_BOTHEDGE应该改为IRQ_TYPE_EDGE_BOTH

*/

request_irq(IRQ_EINT1, buttons_irq, IRQ_TYPE_EDGE_BOTH, "K1",&pins_desc[0]);

request_irq(IRQ_EINT4, buttons_irq, IRQ_TYPE_EDGE_BOTH, "K2",&pins_desc[1]);

request_irq(IRQ_EINT2, buttons_irq, IRQ_TYPE_EDGE_BOTH, "K3",&pins_desc[2]);

request_irq(IRQ_EINT0, buttons_irq, IRQ_TYPE_EDGE_BOTH, "K4",&pins_desc[3]);

return 0;

}

static ssize_t third_drv_read(struct file *file, char __user *user, size_t size,loff_t *ppos)

{

if (size != 1)

return -EINVAL;

/* 当没有按键按下时,休眠。

* 即ev_press = 0;

* 当有按键按下时,发生中断,在中断处理函数会唤醒

* 即ev_press = 1;

* 唤醒后,接着继续将数据通过copy_to_user函数传递给应用程序

*/

wait_event_interruptible(button_waitq, ev_press);

copy_to_user(user, &key_val, 1);

/* 将ev_press清零 */

ev_press = 0;

return 1;

}

static int third_drv_close(struct inode *inode, struct file *file)

{

free_irq(IRQ_EINT1,&pins_desc[0]);

free_irq(IRQ_EINT4,&pins_desc[1]);

free_irq(IRQ_EINT2,&pins_desc[2]);

free_irq(IRQ_EINT0,&pins_desc[3]);

return 0;

}

/* File operations struct for character device */

static const struct file_operations third_drv_fops = {

.owner = THIS_MODULE,

.open = third_drv_open,

.read = third_drv_read,

.release = third_drv_close,

};

/* 驱动入口函数 */

static int third_drv_init(void)

{

/* 主设备号设置为0表示由系统自动分配主设备号 */

major = register_chrdev(0, "third_drv", &third_drv_fops);

/* 创建thirddrv类 */

thirddrv_class = class_create(THIS_MODULE, "thirddrv");

/* 在thirddrv类下创建buttons设备,供应用程序打开设备*/

thirddrv_device = device_create(thirddrv_class, NULL, MKDEV(major, 0), NULL, "buttons");

return 0;

}

/* 驱动出口函数 */

static void third_drv_exit(void)

{

unregister_chrdev(major, "third_drv");

device_unregister(thirddrv_device); //卸载类下的设备

class_destroy(thirddrv_class); //卸载类

}

module_init(third_drv_init); //用于修饰入口函数

module_exit(third_drv_exit); //用于修饰出口函数

MODULE_AUTHOR("LWJ");

MODULE_DESCRIPTION("Just for Demon");

MODULE_LICENSE("GPL"); //遵循GPL协议

13.再创建一个.c文件,测试代码

#include <stdio.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

int main(int argc ,char *argv[])

{

int fd;

unsigned char key_val;

fd = open("/dev/buttons",O_RDWR);

if (fd < 0)

{

printf("open error\n");

}

while(1)

{

read(fd,&key_val,1);

printf("key_val = 0x%x\n",key_val);

}

return 0;

}

14.接下来就是在系统上分别编译这两个代码

15.打开超级终端,重启系统,将得到的.ko和可执行文件发送到/home下

16.insmod .ko

17../可执行文件

18.分别按上下左右按键,效果如下:

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