1 /*参考/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); //设备
58 struct usb_endpoint_descriptor *endpoint;
59 struct usb_host_interface *interface;
60
61 mouse_dev = input_allocate_device();
62 /*设置事件*/
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 /*时间函数*/
76
77 init_timer(&mouse_timer);
78 mouse_timer.function = mouse_time_function;
79 add_timer(&mouse_timer);
80
81 interface = intf->cur_altsetting; //接口
82 if (interface->desc.bNumEndpoints != 1)
83 return -ENODEV;
84
85 endpoint = &interface->endpoint[0].desc; //端点
86 if (!usb_endpoint_is_int_in(endpoint))
87 return -ENODEV;
88
89 len = endpoint->wMaxPacketSize; //长度(多少字节)
90
91 buf = usb_alloc_coherent(mdev, len, GFP_ATOMIC, &mouse_dma); //传输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); //初始化中断型urb结构体
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); //设备
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("1653699780@qq.com");
