滑鼠作為按鍵輸入之完整程式

  1 /*參考/drivers/hid/usbhid/usbmouse.c*/
  2 
  3 #include <linux/kernel.h>
  4 #include <linux/slab.h>
  5 #include <linux/module.h>
  6 #include <linux/init.h>
  7 #include <linux/usb/input.h>
  8 #include <linux/hid.h>
  9 
 10 static struct urb *mouse_urb;
 11 static int len;
 12 static char *buf;
 13 static dma_addr_t mouse_dma;
 14 
 15 static struct input_dev *mouse_dev;
 16 static struct timer_list mouse_timer;
 17 
 18 static const struct usb_device_id mouse_table[] = {
 19     { USB_INTERFACE_INFO(USB_INTERFACE_CLASS_HID, USB_INTERFACE_SUBCLASS_BOOT,
 20         USB_INTERFACE_PROTOCOL_MOUSE) },        /* mouse */
 21     { }/* Terminating entry */
 22 };
 23 
 24 MODULE_DEVICE_TABLE (usb, mouse_table);
 25 
 26 static void usb_mouse_irq(struct urb *urb)
 27 {
 28      mod_timer(&mouse_timer,jiffies + HZ/100);
 29 }
 30 
 31 static void mouse_time_function(unsigned long data)
 32 {
 33      static char pre_val;
 34      
 35      if((pre_val & (1<<0)) != (buf[0] & (1<<0))){
 36        input_event(mouse_dev,EV_KEY,KEY_L,buf[0] & (1<<0) ? 1 : 0);
 37        input_sync(mouse_dev);
 38      }
 39      if((pre_val & (1<<1)) != (buf[0] & (1<<1))){
 40        input_event(mouse_dev,EV_KEY,KEY_S,buf[0] & (1<<1) ? 1 : 0);
 41        input_sync(mouse_dev);  
 42      }
 43       if((pre_val & (1<<2)) != (buf[0] & (1<<2))){
 44        input_event(mouse_dev,EV_KEY,KEY_ENTER,buf[0] & (1<<2) ? 1 : 0);
 45         input_sync(mouse_dev);
 46      }
 47     
 48      pre_val = buf[0];
 49      usb_submit_urb(mouse_urb, GFP_KERNEL);
 50 }
 51 
 52 static int mouse_probe(struct usb_interface *intf,
 53              const struct usb_device_id *id)
 54 {
 55       int pipe;
 56       int res;
 57       struct usb_device *mdev = interface_to_usbdev(intf);  //設備
 58       struct usb_endpoint_descriptor *endpoint;
 59       struct usb_host_interface *interface;
 60       
 61       mouse_dev = input_allocate_device();  
 62       /*設置事件*/
 63       set_bit(EV_KEY,mouse_dev->evbit);
 64       set_bit(EV_REP,mouse_dev->evbit);
 65 
 66       set_bit(KEY_L,mouse_dev->keybit);
 67       set_bit(KEY_S,mouse_dev->keybit);
 68       set_bit(KEY_ENTER,mouse_dev->keybit);
 69 
 70       res = input_register_device(mouse_dev);
 71       if(res){
 72         printk("input_register_device failed!\n");
 73         return -1;
 74       }
 75       /*時間函數*/
 76       
 77       init_timer(&mouse_timer);
 78       mouse_timer.function = mouse_time_function;
 79       add_timer(&mouse_timer);
 80       
 81       interface = intf->cur_altsetting;  //介面
 82       if (interface->desc.bNumEndpoints != 1)
 83         return -ENODEV;
 84       
 85       endpoint = &interface->endpoint[0].desc;  //端點
 86       if (!usb_endpoint_is_int_in(endpoint))
 87         return -ENODEV;
 88       
 89       len = endpoint->wMaxPacketSize;    //長度(多少位元組)
 90 
 91       buf = usb_alloc_coherent(mdev, len, GFP_ATOMIC, &mouse_dma); //傳輸buffer，目的
 92       
 93       pipe=usb_rcvintpipe(mdev,endpoint->bEndpointAddress);  //源
 94      
 95       mouse_urb = usb_alloc_urb(0, GFP_KERNEL);    
 96       
 97       usb_fill_int_urb(mouse_urb,mdev,pipe,buf,len,usb_mouse_irq, NULL, endpoint->bInterval);   //初始化中斷型urb結構體
 98       mouse_urb->transfer_dma = mouse_dma;
 99       mouse_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
100       
101       usb_submit_urb(mouse_urb, GFP_KERNEL);
102       
103      return 0;
104 }
105 
106 static void mouse_disconnect(struct usb_interface *intf)
107 {
108       struct usb_device *mdev = interface_to_usbdev(intf);  //設備
109       usb_kill_urb(mouse_urb);
110       usb_free_urb(mouse_urb);
111       usb_free_coherent(mdev, len, buf, mouse_dma);
112       del_timer(&mouse_timer);
113       input_unregister_device(mouse_dev);
114       input_free_device(mouse_dev);
115       
116 }
117 
118 static struct usb_driver usb_driver = {
119     .name        = "mouse",
120     .probe        = mouse_probe,
121     .disconnect = mouse_disconnect,
122     .id_table    = mouse_table,
123 };
124 
125 static int usb_drv_init(void)
126 {
127       usb_register(&usb_driver);
128       return 0;
129 }
130 
131 static void usb_drv_exit(void)
132 {
133       usb_deregister(&usb_driver);
134 }
135 
136 module_init(usb_drv_init);
137 module_exit(usb_drv_exit);
138 //module_usb_driver(usb_driver);
139 
140 MODULE_LICENSE("GPL");
141 MODULE_AUTHOR("[email protected]");