keypad1.c

linux操作系统下的键盘驱动程序

//键盘飞梭驱动 


#include <linux/kernel.h> 
#include <linux/slab.h> 
#include <linux/module.h> 
#include <linux/input.h> 
#include <linux/init.h> 
#include <linux/usb.h> 
#include <linux/kbd_ll.h> 

/* 
* Version Information 
*/ 
#define DRIVER_VERSION "" 
#define DRIVER_AUTHOR "TGE HOTKEY " 
#define DRIVER_DESC "USB HID Tge hotkey driver" 

#define USB_HOTKEY_VENDOR_ID 0x07e4 
#define USB_HOTKEY_PRODUCT_ID 0x9473 
//厂商和产品ID信息就是/proc/bus/usb/devices中看到的值 

MODULE_AUTHOR( DRIVER_AUTHOR ); 
MODULE_DESCRIPTION( DRIVER_DESC ); 

struct usb_kbd { 
struct input_dev dev; 
struct usb_device *usbdev; 
unsigned char new[8]; 
unsigned char old[8]; 
struct urb irq, led; 
// devrequest dr; 
//这一行和下一行的区别在于kernel2.4.20版本对usb_kbd键盘结构定义发生了变化 
struct usb_ctrlrequest dr; 
unsigned char leds, newleds; 
char name[128]; 
int open; 
}; 
//此结构来自内核中drivers/usb/usbkbd..c 

static void usb_kbd_irq(struct urb *urb) 
{ 
struct usb_kbd *kbd = urb->context; 
int *new; 
new = (int *) kbd->new; 

if(kbd->new[0] == (char)0x01) 
{ 
if(((kbd->new[1]>>4)&0x0f)!=0x7) 
{ 
handle_scancode(0xe0,1); 
handle_scancode(0x4b,1); 
handle_scancode(0xe0,0); 
handle_scancode(0x4b,0); 
} 
else 
{ 
handle_scancode(0xe0,1); 
handle_scancode(0x4d,1); 
handle_scancode(0xe0,0); 
handle_scancode(0x4d,0); 
} 
} 


printk("new=%x %x %x %x %x %x %x %x", 
kbd->new[0],kbd->new[1],kbd->new[2],kbd->new[3], 
kbd->new[4],kbd->new[5],kbd->new[6],kbd->new[7]); 

} 

static void *usb_kbd_probe(struct usb_device *dev, unsigned int ifnum, 
const struct usb_device_id *id) 
{ 
struct usb_interface *iface; 
struct usb_interface_descriptor *interface; 
struct usb_endpoint_descriptor *endpoint; 
struct usb_kbd *kbd; 
int pipe, maxp; 

iface = &dev->actconfig->interface[ifnum]; 
interface = &iface->altsetting[iface->act_altsetting]; 

if ((dev->descriptor.idVendor != USB_HOTKEY_VENDOR_ID) || 
(dev->descriptor.idProduct != USB_HOTKEY_PRODUCT_ID) || 
(ifnum != 1)) 
{ 
return NULL; 
} 
if (dev->actconfig->bNumInterfaces != 2) 
{ 
return NULL; 
} 

if (interface->bNumEndpoints != 1) return NULL; 

endpoint = interface->endpoint + 0; 

pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress); 
maxp = usb_maxpacket(dev, pipe, usb_pipeout(pipe)); 

usb_set_protocol(dev, interface->bInterfaceNumber, 0); 
usb_set_idle(dev, interface->bInterfaceNumber, 0, 0); 

printk(KERN_INFO "GUO: Vid = %.4x, Pid = %.4x, Device = %.2x, ifnum = %.2x, bufCount = %.8x\\n", 
dev->descriptor.idVendor,dev->descriptor.idProduct,dev->descriptor.bcdDevice, ifnum, maxp); 

if (!(kbd = kmalloc(sizeof(struct usb_kbd), GFP_KERNEL))) return NULL; 
memset(kbd, 0, sizeof(struct usb_kbd)); 

kbd->usbdev = dev; 

FILL_INT_URB(&kbd->irq, dev, pipe, kbd->new, maxp > 8 ? 8 : maxp, 
usb_kbd_irq, kbd, endpoint->bInterval); 

kbd->irq.dev = kbd->usbdev; 

if (dev->descriptor.iManufacturer) 
usb_string(dev, dev->descriptor.iManufacturer, kbd->name, 63); 

if (usb_submit_urb(&kbd->irq)) { 
kfree(kbd); 
return NULL; 
} 

printk(KERN_INFO "input%d: %s on usb%d:%d.%d\\n", 
kbd->dev.number, kbd->name, dev->bus->busnum, dev->devnum, ifnum); 

return kbd; 
} 

static void usb_kbd_disconnect(struct usb_device *dev, void *ptr) 
{ 
struct usb_kbd *kbd = ptr; 
usb_unlink_urb(&kbd->irq); 
kfree(kbd); 

} 

static struct usb_device_id usb_kbd_id_table [] = { 
{ USB_DEVICE(USB_HOTKEY_VENDOR_ID, USB_HOTKEY_PRODUCT_ID) }, 
{ } /* Terminating entry */ 
}; 

MODULE_DEVICE_TABLE (usb, usb_kbd_id_table); 

static struct usb_driver usb_kbd_driver = { 
name: "Hotkey", 
probe: usb_kbd_probe, 
disconnect: usb_kbd_disconnect, 
id_table: usb_kbd_id_table, 
NULL, 
}; 

static int __init usb_kbd_init(void) 
{ 
usb_register(&usb_kbd_driver); 
info(DRIVER_VERSION ":" DRIVER_DESC); 
return 0; 
} 

static void __exit usb_kbd_exit(void) 
{ 
usb_deregister(&usb_kbd_driver); 
} 

module_init(usb_kbd_init); 
module_exit(usb_kbd_exit);