目的:把usb鼠标当作按键使用,左键相当按键l,右键相当按键s,中键相当enter
代码如下
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/*
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* 参考drivers\hid\usbhid\usbmouse.c
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/usb/input.h>
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#include <linux/hid.h>
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static struct input_dev *uk_dev;
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static char *usb_buf;
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static dma_addr_t usb_buf_phys;
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static int len;
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static struct urb *uk_urb;
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static struct usb_device_id usbmouse_as_key_id_table [] = {
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{ USB_INTERFACE_INFO(USB_INTERFACE_CLASS_HID, USB_INTERFACE_SUBCLASS_BOOT,USB_INTERFACE_PROTOCOL_MOUSE) },
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//只要USB设备的接口描述符里的类是HID,子类是BOOT,协议是MOUSE,那就支持该设备
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//{USB_DEVICE(0x1234,0x5678)},
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//只支持某个厂家生产的某个产品,厂家编号0x1234,设备编号0x5678
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{ } /* Terminating entry */
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};
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static void usbmouse_as_key_irq(struct urb *urb)
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{
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static unsigned char pre_val;
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/* USB鼠标数据含义
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* data[0]: bit0-左键, 1-按下, 0-松开
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* bit1-右键, 1-按下, 0-松开
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* bit2-中键, 1-按下, 0-松开
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*/
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if ((pre_val & (1<<0)) != (usb_buf[0] & (1<<0)))
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{
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/* 左键发生了变化 */
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input_event(uk_dev, EV_KEY, KEY_L, (usb_buf[0] & (1<<0)) ? 1 : 0);
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input_sync(uk_dev);
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}
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if ((pre_val & (1<<1)) != (usb_buf[0] & (1<<1)))
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{
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/* 右键发生了变化 */
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input_event(uk_dev, EV_KEY, KEY_S, (usb_buf[0] & (1<<1)) ? 1 : 0);
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input_sync(uk_dev);
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}
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if ((pre_val & (1<<2)) != (usb_buf[0] & (1<<2)))
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{
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/* 中键发生了变化 */
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input_event(uk_dev, EV_KEY, KEY_ENTER, (usb_buf[0] & (1<<2)) ? 1 : 0);
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input_sync(uk_dev);
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}
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pre_val = usb_buf[0];
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/* 重新提交urb */
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usb_submit_urb(uk_urb, GFP_KERNEL);
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}
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static int usbmouse_as_key_probe(struct usb_interface *intf, const struct usb_device_id *id)
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{
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struct usb_device *dev = interface_to_usbdev(intf);
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struct usb_host_interface *interface;
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struct usb_endpoint_descriptor *endpoint;
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int pipe;
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printk("find usbmouse!\n");
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printk("bcdUSB = %x\n", dev->descriptor.bcdUSB);
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printk("VID = 0x%x\n", dev->descriptor.idVendor);
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printk("PID = 0x%x\n", dev->descriptor.idProduct);
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interface = intf->cur_altsetting;
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endpoint = &interface->endpoint[0].desc;
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/* a. 分配一个input_dev */
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uk_dev = input_allocate_device();
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/* b. 设置 */
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/* b.1 能产生哪类事件 */
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set_bit(EV_KEY, uk_dev->evbit);//按键类事件
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set_bit(EV_REP, uk_dev->evbit);//重复类事件
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/* b.2 能产生哪些事件 */
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set_bit(KEY_L, uk_dev->keybit);//左键作为按键L
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set_bit(KEY_S, uk_dev->keybit);//右键作为按键S
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set_bit(KEY_ENTER, uk_dev->keybit);//中键作为按键ENTER
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/* c. 注册 */
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if( input_register_device(uk_dev) )
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return -EFAULT;
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/* d. 硬件相关操作 */
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/* 数据传输3要素: 源,目的,长度 */
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/* 源: USB设备的某个端点 */
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pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
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/* 长度: */
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len = endpoint->wMaxPacketSize;
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/* 目的: */
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usb_buf = usb_alloc_coherent(dev, len, GFP_ATOMIC, &usb_buf_phys);
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/* 使用"3要素" */
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/* 分配usb request block */
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uk_urb = usb_alloc_urb(0, GFP_KERNEL);
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/* 使用"3要素设置urb" */
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usb_fill_int_urb(uk_urb, dev, pipe, usb_buf, len, usbmouse_as_key_irq, NULL, endpoint->bInterval);
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uk_urb->transfer_dma = usb_buf_phys;
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uk_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
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/* 使用URB */
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usb_submit_urb(uk_urb, GFP_KERNEL);
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return 0;
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}
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static void usbmouse_as_key_disconnect(struct usb_interface *intf)
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{
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printk("disconnect usbmouse!\n");
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}
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/* 1. 分配/设置usb_driver */
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static struct usb_driver usbmouse_as_key_driver = {
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.name = "usbmouse_as_key",
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.probe = usbmouse_as_key_probe,
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.disconnect = usbmouse_as_key_disconnect,
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.id_table = usbmouse_as_key_id_table,
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};
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static int usbmouse_as_key_init(void)
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{
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/* 2. 注册 */
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usb_register(&usbmouse_as_key_driver);
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return 0;
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}
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static void usbmouse_as_key_exit(void)
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{
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usb_deregister(&usbmouse_as_key_driver);
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}
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module_init(usbmouse_as_key_init);
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module_exit(usbmouse_as_key_exit);
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MODULE_LICENSE("GPL");
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