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文章出处：http://www.limodev.cn/blog
作者联系方式：李先静
前段时间写一个程序，要向系统中注入mouse事件，我又不想信赖于具体的GUI，就写一个虚拟mouse设备驱动程序，感觉挺好用的，不过后来发现 linux其实有一个uinput驱动程序实现了类似的功能。幸好后来才发现uinput这玩意儿，否则就没有机会去写了，有时真是宁愿知识面窄一点，这样才有机会重复发明一些轮子，从中获得一些乐趣。
o 先写一个字符驱动程序。
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
int vmouse_major = 200;
module_param(vmouse_major, int, 0);
MODULE_AUTHOR("Li XianJing ");
MODULE_LICENSE("GPL");
static struct input_dev* vmouse_idev = NULL;
int vmouse_open(struct inode* inode, struct file* filp)
{
return 0;
}
int vmouse_release(struct inode* inode, struct file* filp)
{
return 0;
}
ssize_t vmouse_read(struct file* filp, char __user *buf, size_t count, loff_t* f_pos)
{
printk(KERN_INFO"%s\n", __func__);
return count;
}
struct mouse_event
{
int press;
int x;
int y;
};
ssize_t vmouse_write(struct file* filp, const char __user * buf, size_t count, loff_t* f_pos)
{
int ret = 0;
struct mouse_event event;
while(ret < count)
{
if(copy_from_user(&event, buf + ret, sizeof(event)))
{
return -EFAULT;
}
ret += sizeof(event);
if(event.press == 1)
{
input_report_key(vmouse_idev, BTN_TOUCH, 1);
input_report_abs(vmouse_idev, ABS_X, event.x & 0xfff);
input_report_abs(vmouse_idev, ABS_Y, event.y & 0xfff);
input_report_abs(vmouse_idev, ABS_PRESSURE, 0xff);
input_sync (vmouse_idev);
}
else if(event.press == -1)
{
input_report_abs(vmouse_idev, ABS_X, event.x & 0xfff);
input_report_abs(vmouse_idev, ABS_Y, event.y & 0xfff);
input_sync (vmouse_idev);
}
else
{
input_report_abs(vmouse_idev, ABS_PRESSURE, 0);
input_report_key(vmouse_idev, BTN_TOUCH, 0);
input_sync (vmouse_idev);
}
printk(KERN_INFO"%s p=%d x=%d y=%d\n", __func__, event.press, event.x, event.y);
}
return ret;
}
static struct file_operations vmouse_fops =
{
.owner = THIS_MODULE,
.open = vmouse_open,
.release = vmouse_release,
.read = vmouse_read,
.write = vmouse_write,
};
static int __init vmouse_init(void)
{
int result = register_chrdev(vmouse_major, "vmouse", &vmouse_fops);
vmouse_input_dev_setup();
return result;
}
static void __exit vmouse_cleanup(void)
{
input_unregister_device(vmouse_idev);
unregister_chrdev(vmouse_major, "vmouse");
return;
}
module_init(vmouse_init);
module_exit(vmouse_cleanup);
o 再实现一个虚拟输入设备。
static int vmouse_input_dev_open(struct input_dev* idev)
{
printk(KERN_INFO"%s\n", __func__);
return 0;
}
static void vmouse_input_dev_close(struct input_dev* idev)
{
printk(KERN_INFO"%s\n", __func__);
return;
}
static int vmouse_input_dev_setup(void)
{
int ret = 0;
vmouse_idev = input_allocate_device();
if(vmouse_idev == NULL)
{
return -ENOMEM;
}
vmouse_idev->name = "vmouse";
vmouse_idev->phys = "vmouse/input0";
vmouse_idev->open = vmouse_input_dev_open;
vmouse_idev->close = vmouse_input_dev_close;
__set_bit(EV_ABS, vmouse_idev->evbit);
__set_bit(EV_KEY, vmouse_idev->evbit);
__set_bit(ABS_X, vmouse_idev->absbit);
__set_bit(ABS_Y, vmouse_idev->absbit);
__set_bit(ABS_PRESSURE, vmouse_idev->absbit);
__set_bit(BTN_TOUCH, vmouse_idev->keybit);
ret = input_register_device(vmouse_idev);
return ret;
}
o Makefile
obj-m := vmouse.o
KDIR := /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)
default:
$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
install:
$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules_install
clean:
rm -f *.mod.c *.ko *.o Module.markers modules.order Module.symvers
加载模块后，向/dev/vmouse里写入要注入的事件，事件将会转发到/dev/input/eventX输入设备文件里，系统会从这里自动读取事件。 