1. 指定USB鍵盤驅(qū)動(dòng)所需的頭文件:
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#include <linux/kernel.h>/*內(nèi)核頭文件，含有內(nèi)核一些常用函數(shù)的原型定義*/
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#include <linux/slab.h>/*定義內(nèi)存分配的一些函數(shù)*/
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#include <linux/module.h>/*模塊編譯必須的頭文件*/
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#include <linux/input.h>/*輸入設(shè)備相關(guān)函數(shù)的頭文件*/
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#include <linux/init.h>/*linux初始化模塊函數(shù)定義*/
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#include <linux/usb.h> /*USB設(shè)備相關(guān)函數(shù)定義*/
/ L {, X, t" U* ?2. 定義鍵盤碼表數(shù)組：
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/*使用第一套鍵盤掃描碼表:A-1E;B-30;C-2E…*/
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static unsigned char usb_kbd_keycode[256] = {
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0, 0, 0, 0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36, 37, 38,
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50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45, 21, 44, 2, 3,
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4, 5, 6, 7, 8, 9, 10, 11, 28, 1, 14, 15, 57, 12, 13, 26,
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27, 43, 43, 39, 40, 41, 51, 52, 53, 58, 59, 60, 61, 62, 63, 64,
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65, 66, 67, 68, 87, 88, 99, 70,119,110,102,104,111,107,109,106,
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105,108,103, 69, 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71,
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72, 73, 82, 83, 86,127,116,117,183,184,185,186,187,188,189,190,
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191,192,193,194,134,138,130,132,128,129,131,137,133,135,136,113,
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115,114, 0, 0, 0,121, 0, 89, 93,124, 92, 94, 95, 0, 0, 0,
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122,123, 90, 91, 85, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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29, 42, 56,125, 97, 54,100,126,164,166,165,163,161,115,114,113,
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150,158,159,128,136,177,178,176,142,152,173,140
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3 Q5 Z0 m! L% y$ V4 r1 G6 A# R3. 編寫設(shè)備ID表：
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static struct usb_device_id usb_kbd_id_table [] = {
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{ USB_INTERFACE_INFO(3, 1, 1) },/*3,1,1分別表示接口類,接口子類,接口協(xié)議;3,1,1為鍵盤接口類;鼠標(biāo)為3,1,2*/
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{ } /* Terminating entry */
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};
4 Z4 ~( {/ _ K1 ]MODULE_DEVICE_TABLE (usb, usb_kbd_id_table);/*指定設(shè)備ID表*/
( Y7 a; y* h' n4. 定義USB鍵盤結(jié)構(gòu)體：
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struct usb_kbd {
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struct input_dev *dev; /*定義一個(gè)輸入設(shè)備*/
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struct usb_device *usbdev;/*定義一個(gè)usb設(shè)備*/
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unsigned char old[8]; /*按鍵離開時(shí)所用之數(shù)據(jù)緩沖區(qū)*/
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struct urb *irq/*usb鍵盤之中斷請求塊*/, *led/*usb鍵盤之指示燈請求塊*/;
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unsigned char newleds;/*目標(biāo)指定燈狀態(tài)*/
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char name[128];/*存放廠商名字及產(chǎn)品名字*/
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char phys[64];/*設(shè)備之節(jié)點(diǎn)*/
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unsigned char *new;/*按鍵按下時(shí)所用之?dāng)?shù)據(jù)緩沖區(qū)*/
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struct usb_ctrlrequest *cr;/*控制請求結(jié)構(gòu)*/
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unsigned char *leds;/*當(dāng)前指示燈狀態(tài)*/
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dma_addr_t cr_dma; /*控制請求DMA緩沖地址*/
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dma_addr_t new_dma; /*中斷urb會(huì)使用該DMA緩沖區(qū)*/
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dma_addr_t leds_dma; /*指示燈DAM緩沖地址*/
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" `# T6 H$ d# x5 a- B3 ^5. 編寫USB鍵盤驅(qū)動(dòng)結(jié)構(gòu)(任何一個(gè)LINUX下的驅(qū)動(dòng)都有個(gè)類似的驅(qū)動(dòng)結(jié)構(gòu))：
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/*USB鍵盤驅(qū)動(dòng)結(jié)構(gòu)體*/
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static struct usb_driver usb_kbd_driver = {
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.name = "usbkbd",/*驅(qū)動(dòng)名字*/
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.probe = usb_kbd_probe,/*驅(qū)動(dòng)探測函數(shù),加載時(shí)用到*/
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.disconnect = usb_kbd_disconnect,/*驅(qū)動(dòng)斷開函數(shù),在卸載時(shí)用到*/
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.id_table = usb_kbd_id_table,/*驅(qū)動(dòng)設(shè)備ID表,用來指定設(shè)備或接口*/
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};
. K9 [0 h. ?4 a, B( O6. 編寫模塊加載函數(shù)(每個(gè)驅(qū)動(dòng)都會(huì)有一個(gè)加載函數(shù)，由module_init調(diào)用)：
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/*驅(qū)動(dòng)程序生命周期的開始點(diǎn)，向 USB core 注冊這個(gè)鍵盤驅(qū)動(dòng)程序。*/
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static int __init usb_kbd_init(void)
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{
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int result = usb_register(&usb_kbd_driver);/*注冊USB鍵盤驅(qū)動(dòng)*/
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if (result == 0) /*注冊失敗*/
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Post By：2010-11-24 10:36:29
