一、usbmouse_as_key.c
/* * drivers\hid\usbhid\usbmouse.c */#include <linux/kernel.h>#include <linux/slab.h>#include <linux/module.h>#include <linux/init.h>#include <linux/usb/input.h>#include <linux/hid.h>static struct input_dev *uk_dev;static char *usb_buf;static dma_addr_t usb_buf_phys;static int len;static struct urb *uk_urb;static struct usb_device_id usbmouse_as_key_id_table [] = { { USB_INTERFACE_INFO(USB_INTERFACE_CLASS_HID, USB_INTERFACE_SUBCLASS_BOOT, USB_INTERFACE_PROTOCOL_MOUSE) }, //{USB_DEVICE(0x1234,0x5678)}, { } /* Terminating entry */};static void usbmouse_as_key_irq(struct urb *urb){ static unsigned char pre_val;#if 0 int i; static int cnt = 0; printk("data cnt %d: ", ++cnt); for (i = 0; i < len; i++) { printk("%02x ", usb_buf[i]); } printk("\n");#endif /* USB鼠标数据含义 * data[0]: bit0-左键, 1-按下, 0-松开 * bit1-右键, 1-按下, 0-松开 * bit2-中键, 1-按下, 0-松开 * */ if ((pre_val & (1<<0)) != (usb_buf[0] & (1<<0))) { /* 左键发生了变化 */ input_event(uk_dev, EV_KEY, KEY_L, (usb_buf[0] & (1<<0)) ? 1 : 0); input_sync(uk_dev); } if ((pre_val & (1<<1)) != (usb_buf[0] & (1<<1))) { /* 右键发生了变化 */ input_event(uk_dev, EV_KEY, KEY_S, (usb_buf[0] & (1<<1)) ? 1 : 0); input_sync(uk_dev); } if ((pre_val & (1<<2)) != (usb_buf[0] & (1<<2))) { /* 中键发生了变化 */ input_event(uk_dev, EV_KEY, KEY_ENTER, (usb_buf[0] & (1<<2)) ? 1 : 0); input_sync(uk_dev); } pre_val = usb_buf[0]; /* 重新提交urb */ usb_submit_urb(uk_urb, GFP_KERNEL);}static int usbmouse_as_key_probe(struct usb_interface *intf, const struct usb_device_id *id){ struct usb_device *dev = interface_to_usbdev(intf); struct usb_host_interface *interface; struct usb_endpoint_descriptor *endpoint; int pipe; interface = intf->cur_altsetting; endpoint = &interface->endpoint[0].desc; /* a. 分配一个input_dev */ uk_dev = input_allocate_device(); /* b. 设置 */ /* b.1 能产生哪类事件 */ set_bit(EV_KEY, uk_dev->evbit); set_bit(EV_REP, uk_dev->evbit); /* b.2 能产生哪些事件 */ set_bit(KEY_L, uk_dev->keybit); set_bit(KEY_S, uk_dev->keybit); set_bit(KEY_ENTER, uk_dev->keybit); /* c. 注册 */ input_register_device(uk_dev); /* d. 硬件相关操作 */ /* 数据传输3要素: 源,目的,长度 */ /* 源: USB设备的某个端点 */ pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress); /* 长度: */ len = endpoint->wMaxPacketSize; /* 目的: */ usb_buf = usb_buffer_alloc(dev, len, GFP_ATOMIC, &usb_buf_phys); /* 使用"3要素" */ /* 分配usb request block */ uk_urb = usb_alloc_urb(0, GFP_KERNEL); /* 使用"3要素设置urb" */ usb_fill_int_urb(uk_urb, dev, pipe, usb_buf, len, usbmouse_as_key_irq, NULL, endpoint->bInterval); uk_urb->transfer_dma = usb_buf_phys; uk_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; /* 使用URB */ usb_submit_urb(uk_urb, GFP_KERNEL); return 0;}static void usbmouse_as_key_disconnect(struct usb_interface *intf){ struct usb_device *dev = interface_to_usbdev(intf); //printk("disconnect usbmouse!\n"); usb_kill_urb(uk_urb); usb_free_urb(uk_urb); usb_buffer_free(dev, len, usb_buf, usb_buf_phys); input_unregister_device(uk_dev); input_free_device(uk_dev);}/* 1. 分配/设置usb_driver */static struct usb_driver usbmouse_as_key_driver = { .name = "usbmouse_as_key_", .probe = usbmouse_as_key_probe, .disconnect = usbmouse_as_key_disconnect, .id_table = usbmouse_as_key_id_table,};static int usbmouse_as_key_init(void){ /* 2. 注册 */ usb_register(&usbmouse_as_key_driver); return 0;}static void usbmouse_as_key_exit(void){ usb_deregister(&usbmouse_as_key_driver); }module_init(usbmouse_as_key_init);module_exit(usbmouse_as_key_exit);MODULE_LICENSE("GPL");二、Makefile
KERN_DIR = /work/system/linux-2.6.22.6
all: make -C $(KERN_DIR) M=`pwd` modules clean: make -C $(KERN_DIR) M=`pwd` modules clean rm -rf modules.orderobj-m += usbmouse_as_key.o