Key code and scan code

Linux 的key code table(定義於http://lxr.linux.no/linux+v2.6.21.4/drivers/input/keyboard/atkbd.c) :

(1) atkbd_set2_keycode for scancode set 2:

static unsigned char atkbd_set2_keycode[512] = {

0, 67, 65, 63, 61, 59, 60, 88, 0, 68, 66, 64, 62, 15, 41,117,
0, 56, 42, 93, 29, 16, 2, 0, 0, 0, 44, 31, 30, 17, 3, 0,
0, 46, 45, 32, 18, 5, 4, 95, 0, 57, 47, 33, 20, 19, 6,183,
0, 49, 48, 35, 34, 21, 7,184, 0, 0, 50, 36, 22, 8, 9,185,
0, 51, 37, 23, 24, 11, 10, 0, 0, 52, 53, 38, 39, 25, 12, 0,
0, 89, 40, 0, 26, 13, 0, 0, 58, 54, 28, 27, 0, 43, 0, 85,
0, 86, 91, 90, 92, 0, 14, 94, 0, 79,124, 75, 71,121, 0, 0,
82, 83, 80, 76, 77, 72, 1, 69, 87, 78, 81, 74, 55, 73, 70, 99,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
217,100,255, 0, 97,165, 0, 0,156, 0, 0, 0, 0, 0, 0,125,
173,114, 0,113, 0, 0, 0,126,128, 0, 0,140, 0, 0, 0,127,
159, 0,115, 0,164, 0, 0,116,158, 0,172,166, 0, 0, 0,142,
157, 0, 0, 0, 0, 0, 0, 0,155, 0, 98, 0, 0,163, 0, 0,
226, 0, 0, 0, 0, 0, 0, 0, 0,255, 96, 0, 0, 0,143, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0,107, 0,105,102, 0, 0,112,
110,111,108,112,106,103, 0,119, 0,118,109, 0, 99,104,119, 0,

0, 0, 0, 65, 99,

};

(1) atkbd_set3_keycode for scancode set 3:

static unsigned char atkbd_set3_keycode[512] = {

0, 0, 0, 0, 0, 0, 0, 59, 1,138,128,129,130, 15, 41, 60,
131, 29, 42, 86, 58, 16, 2, 61,133, 56, 44, 31, 30, 17, 3, 62,
134, 46, 45, 32, 18, 5, 4, 63,135, 57, 47, 33, 20, 19, 6, 64,
136, 49, 48, 35, 34, 21, 7, 65,137,100, 50, 36, 22, 8, 9, 66,
125, 51, 37, 23, 24, 11, 10, 67,126, 52, 53, 38, 39, 25, 12, 68,
113,114, 40, 43, 26, 13, 87, 99, 97, 54, 28, 27, 43, 43, 88, 70,
108,105,119,103,111,107, 14,110, 0, 79,106, 75, 71,109,102,104,
82, 83, 80, 76, 77, 72, 69, 98, 0, 96, 81, 0, 78, 73, 55,183,

184,185,186,187, 74, 94, 92, 93, 0, 0, 0,125,126,127,112, 0,
0,139,172,163,165,115,152,172,166,140,160,154,113,114,167,168,
148,149,147,140
};

(3) 假設keyboard 支援 scancode set 2，則scancode 0x05表鍵F1，而對應的key code是 atkbd_set2_keycode[5]=59,該數字在linux kernel中表"鍵F1"(http://lxr.linux.no/linux+v2.6.21.4/include/linux/input.h) 而設定keycode和scancode的method setkeycode()定義於http://lxr.linux.no/linux+v2.6.21.4/drivers/char/keyboard.c

(4)Linux使用 key code table的目的：

是不管keyboard 支援什麼樣的scancode set均以同樣的key code table來處理keyboard資料的對應