linux input 驱动

可以回答这个问题。Linux input 驱动是用于处理输入设备的驱动程序，包括键盘、鼠标、触摸屏等。它负责将输入设备的信号转换为操作系统能够识别的数据，并将其传递给应用程序。Linux input 驱动是 Linux 内核的一部分，它提供了一种标准的接口，使得应用程序可以方便地处理各种输入设备。

相关问题

linux input子系统

在Linux中，输入子系统是为了支持各种不同类型的输入设备而开发的。它能够处理触摸屏、鼠标、键盘等输入设备，并且也支持蜂鸣器、LED等输出设备。输入子系统的作用是为上层提供统一的抽象层，为驱动层程序的实现提供统一的接口。通过输入子系统，输入设备的驱动程序可以注册到内核，并利用子系统提供的功能与用户空间进行交互。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* *3* [Linux之Input子系统](https://blog.csdn.net/qq_53144843/article/details/127074752)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
- *2* [Linux驱动-Input子系统](https://blog.csdn.net/weixin_51703421/article/details/125945675)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
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input 驱动代码demo

以下是一个简单的 input 驱动代码示例：

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/input.h>

#define DEVICE_NAME "my_input_device"
#define CLASS_NAME "my_input_class"

static struct input_dev *my_input_dev;
static struct cdev my_cdev;
static dev_t my_dev;
static struct class *my_class;
static struct device *my_device;

static int my_open(struct inode *inode, struct file *file)
{
return 0;
}

static int my_release(struct inode *inode, struct file *file)
{
return 0;
}

static ssize_t my_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
int ret;
char *data;

data = kmalloc(count, GFP_KERNEL);
if (!data)
return -ENOMEM;

ret = copy_from_user(data, buf, count);
if (ret) {
kfree(data);
return -EFAULT;
}

input_report_key(my_input_dev, KEY_A, data[0] & 1);
input_sync(my_input_dev);

kfree(data);

return count;
}

static const struct file_operations my_fops = {
.owner = THIS_MODULE,
.open = my_open,
.release = my_release,
.write = my_write,
};

static int __init my_init(void)
{
int ret;

ret = alloc_chrdev_region(&my_dev, 0, 1, DEVICE_NAME);
if (ret)
goto fail_alloc_chrdev_region;

cdev_init(&my_cdev, &my_fops);
my_cdev.owner = THIS_MODULE;

ret = cdev_add(&my_cdev, my_dev, 1);
if (ret)
goto fail_cdev_add;

my_class = class_create(THIS_MODULE, CLASS_NAME);
if (IS_ERR(my_class)) {
ret = PTR_ERR(my_class);
goto fail_class_create;
}

my_device = device_create(my_class, NULL, my_dev, NULL, DEVICE_NAME);
if (IS_ERR(my_device)) {
ret = PTR_ERR(my_device);
goto fail_device_create;
}

my_input_dev = input_allocate_device();
if (!my_input_dev) {
ret = -ENOMEM;
goto fail_input_allocate_device;
}

my_input_dev->name = DEVICE_NAME;
my_input_dev->phys = "my_input_device";
my_input_dev->id.bustype = BUS_VIRTUAL;
my_input_dev->id.vendor = 0x0001;
my_input_dev->id.product = 0x0001;
my_input_dev->id.version = 0x0100;

set_bit(EV_KEY, my_input_dev->evbit);
set_bit(KEY_A, my_input_dev->keybit);

ret = input_register_device(my_input_dev);
if (ret)
goto fail_input_register_device;

return 0;

fail_input_register_device:
input_free_device(my_input_dev);
fail_input_allocate_device:
device_destroy(my_class, my_dev);
fail_device_create:
class_destroy(my_class);
fail_class_create:
cdev_del(&my_cdev);
fail_cdev_add:
unregister_chrdev_region(my_dev, 1);
fail_alloc_chrdev_region:
return ret;
}

static void __exit my_exit(void)
{
input_unregister_device(my_input_dev);
input_free_device(my_input_dev);
device_destroy(my_class, my_dev);
class_destroy(my_class);
cdev_del(&my_cdev);
unregister_chrdev_region(my_dev, 1);
}

module_init(my_init);
module_exit(my_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple input driver");