keyboard.c   [plain text]

/*
 * Copyright © 1999 Keith Packard
 * XKB integration © 2006 Nokia Corporation, author: Tomas Frydrych <tf@o-hand.com>
 *
 * LinuxKeyboardRead() XKB code based on xf86KbdLnx.c:
 * Copyright © 1990,91 by Thomas Roell, Dinkelscherben, Germany.
 * Copyright © 1994-2001 by The XFree86 Project, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name of the copyright holder(s)
 * and author(s) shall not be used in advertising or otherwise to promote
 * the sale, use or other dealings in this Software without prior written
 * authorization from the copyright holder(s) and author(s).
 */

#ifdef HAVE_CONFIG_H
#include <kdrive-config.h>
#endif
#include "kdrive.h"
#include <linux/keyboard.h>
#include <linux/kd.h>
#define XK_PUBLISHING
#include <X11/keysym.h>
#include <termios.h>
#include <sys/ioctl.h>

extern int LinuxConsoleFd;

static const KeySym linux_to_x[256] = {
	NoSymbol,	NoSymbol,	NoSymbol,	NoSymbol,
	NoSymbol,	NoSymbol,	NoSymbol,	NoSymbol,
	XK_BackSpace,	XK_Tab,		XK_Linefeed,	NoSymbol,
	NoSymbol,	NoSymbol,	NoSymbol,	NoSymbol,
	NoSymbol,	NoSymbol,	NoSymbol,	NoSymbol,
	NoSymbol,	NoSymbol,	NoSymbol,	NoSymbol,
	NoSymbol,	NoSymbol,	NoSymbol,	XK_Escape,
	NoSymbol,	NoSymbol,	NoSymbol,	NoSymbol,
	XK_space,	XK_exclam,	XK_quotedbl,	XK_numbersign,
	XK_dollar,	XK_percent,	XK_ampersand,	XK_apostrophe,
	XK_parenleft,	XK_parenright,	XK_asterisk,	XK_plus,
	XK_comma,	XK_minus,	XK_period,	XK_slash,
	XK_0,		XK_1,		XK_2,		XK_3,
	XK_4,		XK_5,		XK_6,		XK_7,
	XK_8,		XK_9,		XK_colon,	XK_semicolon,
	XK_less,	XK_equal,	XK_greater,	XK_question,
	XK_at,		XK_A,		XK_B,		XK_C,
	XK_D,		XK_E,		XK_F,		XK_G,
	XK_H,		XK_I,		XK_J,		XK_K,
	XK_L,		XK_M,		XK_N,		XK_O,
	XK_P,		XK_Q,		XK_R,		XK_S,
	XK_T,		XK_U,		XK_V,		XK_W,
	XK_X,		XK_Y,		XK_Z,		XK_bracketleft,
	XK_backslash,	XK_bracketright,XK_asciicircum,	XK_underscore,
	XK_grave,	XK_a,		XK_b,		XK_c,
	XK_d,		XK_e,		XK_f,		XK_g,
	XK_h,		XK_i,		XK_j,		XK_k,
	XK_l,		XK_m,		XK_n,		XK_o,
	XK_p,		XK_q,		XK_r,		XK_s,
	XK_t,		XK_u,		XK_v,		XK_w,
	XK_x,		XK_y,		XK_z,		XK_braceleft,
	XK_bar,		XK_braceright,	XK_asciitilde,	XK_BackSpace,
	NoSymbol,	NoSymbol,	NoSymbol,	NoSymbol,
	NoSymbol,	NoSymbol,	NoSymbol,	NoSymbol,
	NoSymbol,	NoSymbol,	NoSymbol,	NoSymbol,
	NoSymbol,	NoSymbol,	NoSymbol,	NoSymbol,
	NoSymbol,	NoSymbol,	NoSymbol,	NoSymbol,
	NoSymbol,	NoSymbol,	NoSymbol,	NoSymbol,
	NoSymbol,	NoSymbol,	NoSymbol,	NoSymbol,
	NoSymbol,	NoSymbol,	NoSymbol,	NoSymbol,
	XK_nobreakspace,XK_exclamdown,	XK_cent,	XK_sterling,
	XK_currency,	XK_yen,		XK_brokenbar,	XK_section,
	XK_diaeresis,	XK_copyright,	XK_ordfeminine,	XK_guillemotleft,
	XK_notsign,	XK_hyphen,	XK_registered,	XK_macron,
	XK_degree,	XK_plusminus,	XK_twosuperior,	XK_threesuperior,
	XK_acute,	XK_mu,		XK_paragraph,	XK_periodcentered,
	XK_cedilla,	XK_onesuperior,	XK_masculine,	XK_guillemotright,
	XK_onequarter,	XK_onehalf,	XK_threequarters,XK_questiondown,
	XK_Agrave,	XK_Aacute,	XK_Acircumflex,	XK_Atilde,
	XK_Adiaeresis,	XK_Aring,	XK_AE,		XK_Ccedilla,
	XK_Egrave,	XK_Eacute,	XK_Ecircumflex,	XK_Ediaeresis,
	XK_Igrave,	XK_Iacute,	XK_Icircumflex,	XK_Idiaeresis,
	XK_ETH,		XK_Ntilde,	XK_Ograve,	XK_Oacute,
	XK_Ocircumflex,	XK_Otilde,	XK_Odiaeresis,	XK_multiply,
	XK_Ooblique,	XK_Ugrave,	XK_Uacute,	XK_Ucircumflex,
	XK_Udiaeresis,	XK_Yacute,	XK_THORN,	XK_ssharp,
	XK_agrave,	XK_aacute,	XK_acircumflex,	XK_atilde,
	XK_adiaeresis,	XK_aring,	XK_ae,		XK_ccedilla,
	XK_egrave,	XK_eacute,	XK_ecircumflex,	XK_ediaeresis,
	XK_igrave,	XK_iacute,	XK_icircumflex,	XK_idiaeresis,
	XK_eth,		XK_ntilde,	XK_ograve,	XK_oacute,
	XK_ocircumflex,	XK_otilde,	XK_odiaeresis,	XK_division,
	XK_oslash,	XK_ugrave,	XK_uacute,	XK_ucircumflex,
	XK_udiaeresis,	XK_yacute,	XK_thorn,	XK_ydiaeresis
};

#ifdef XKB
/*
 * Getting a keycode from scancode
 *
 * With XKB
 * --------
 *
 * We have to enqueue keyboard events using standard X keycodes which correspond
 * to AT scancode + 8; this means that we need to translate the Linux scancode
 * provided by the kernel to an AT scancode -- this translation is not linear
 * and requires that we use a LUT.
 *
 *
 * Without XKB
 * -----------
 *
 * We can use custom keycodes, which makes things simpler; we define our custom
 * keycodes as Linux scancodes + KD_KEY_OFFSET
*/

/*
   This LUT translates AT scancodes into Linux ones -- the keymap we create
   for the core X keyboard protocol has to be AT-scancode based so that it
   corresponds to the Xkb keymap.
*/
static unsigned char at2lnx[] =
{
	0x0,    /* no valid scancode */
	0x01,	/* KEY_Escape */	0x02,	/* KEY_1 */
	0x03,	/* KEY_2 */		0x04,	/* KEY_3 */
	0x05,	/* KEY_4 */		0x06,	/* KEY_5 */
	0x07,	/* KEY_6 */		0x08,	/* KEY_7 */
	0x09,	/* KEY_8 */		0x0a,	/* KEY_9 */
	0x0b,	/* KEY_0 */		0x0c,	/* KEY_Minus */
	0x0d,	/* KEY_Equal */		0x0e,	/* KEY_BackSpace */
	0x0f,	/* KEY_Tab */		0x10,	/* KEY_Q */
	0x11,	/* KEY_W */		0x12,	/* KEY_E */
	0x13,	/* KEY_R */		0x14,	/* KEY_T */
	0x15,	/* KEY_Y */		0x16,	/* KEY_U */
	0x17,	/* KEY_I */		0x18,	/* KEY_O */
	0x19,	/* KEY_P */		0x1a,	/* KEY_LBrace */
	0x1b,	/* KEY_RBrace */	0x1c,	/* KEY_Enter */
	0x1d,	/* KEY_LCtrl */		0x1e,	/* KEY_A */
	0x1f,	/* KEY_S */		0x20,	/* KEY_D */
	0x21,	/* KEY_F */		0x22,	/* KEY_G */
	0x23,	/* KEY_H */		0x24,	/* KEY_J */
	0x25,	/* KEY_K */		0x26,	/* KEY_L */
	0x27,	/* KEY_SemiColon */	0x28,	/* KEY_Quote */
	0x29,	/* KEY_Tilde */		0x2a,	/* KEY_ShiftL */
	0x2b,	/* KEY_BSlash */	0x2c,	/* KEY_Z */
	0x2d,	/* KEY_X */		0x2e,	/* KEY_C */
	0x2f,	/* KEY_V */		0x30,	/* KEY_B */
	0x31,	/* KEY_N */		0x32,	/* KEY_M */
	0x33,	/* KEY_Comma */		0x34,	/* KEY_Period */
	0x35,	/* KEY_Slash */		0x36,	/* KEY_ShiftR */
	0x37,	/* KEY_KP_Multiply */	0x38,	/* KEY_Alt */
	0x39,	/* KEY_Space */		0x3a,	/* KEY_CapsLock */
	0x3b,	/* KEY_F1 */		0x3c,	/* KEY_F2 */
	0x3d,	/* KEY_F3 */		0x3e,	/* KEY_F4 */
	0x3f,	/* KEY_F5 */		0x40,	/* KEY_F6 */
	0x41,	/* KEY_F7 */		0x42,	/* KEY_F8 */
	0x43,	/* KEY_F9 */		0x44,	/* KEY_F10 */
	0x45,	/* KEY_NumLock */	0x46,	/* KEY_ScrollLock */
	0x47,	/* KEY_KP_7 */		0x48,	/* KEY_KP_8 */
	0x49,	/* KEY_KP_9 */		0x4a,	/* KEY_KP_Minus */
	0x4b,	/* KEY_KP_4 */		0x4c,	/* KEY_KP_5 */
	0x4d,	/* KEY_KP_6 */		0x4e,	/* KEY_KP_Plus */
	0x4f,	/* KEY_KP_1 */		0x50,	/* KEY_KP_2 */
	0x51,	/* KEY_KP_3 */		0x52,	/* KEY_KP_0 */
	0x53,	/* KEY_KP_Decimal */	0x54,	/* KEY_SysReqest */
	0x00,	/* 0x55 */		0x56,	/* KEY_Less */
	0x57,	/* KEY_F11 */		0x58,	/* KEY_F12 */
	0x66,	/* KEY_Home */		0x67,	/* KEY_Up */
	0x68,	/* KEY_PgUp */		0x69,	/* KEY_Left */
	0x5d,	/* KEY_Begin */		0x6a,	/* KEY_Right */
	0x6b,	/* KEY_End */		0x6c,	/* KEY_Down */
	0x6d,	/* KEY_PgDown */	0x6e,	/* KEY_Insert */
	0x6f,	/* KEY_Delete */	0x60,	/* KEY_KP_Enter */
	0x61,	/* KEY_RCtrl */		0x77,	/* KEY_Pause */
	0x63,	/* KEY_Print */		0x62,	/* KEY_KP_Divide */
	0x64,	/* KEY_AltLang */	0x65,	/* KEY_Break */
	0x00,	/* KEY_LMeta */		0x00,	/* KEY_RMeta */
	0x7A,	/* KEY_Menu/FOCUS_PF11*/0x00,	/* 0x6e */
	0x7B,	/* FOCUS_PF12 */	0x00,	/* 0x70 */
	0x00,	/* 0x71 */		0x00,	/* 0x72 */
	0x59,	/* FOCUS_PF2 */		0x78,	/* FOCUS_PF9 */
	0x00,	/* 0x75 */		0x00,	/* 0x76 */
	0x5A,	/* FOCUS_PF3 */		0x5B,	/* FOCUS_PF4 */
	0x5C,	/* FOCUS_PF5 */		0x5D,	/* FOCUS_PF6 */
	0x5E,	/* FOCUS_PF7 */		0x5F,	/* FOCUS_PF8 */
	0x7C,	/* JAP_86 */		0x79,	/* FOCUS_PF10 */
	0x00,	/* 0x7f */
};

#define NUM_AT_KEYS (sizeof(at2lnx)/sizeof(at2lnx[0]))
#define LNX_KEY_INDEX(n) n < NUM_AT_KEYS ? at2lnx[n] : 0

#else /* not XKB */
#define LNX_KEY_INDEX(n) n
#endif

static unsigned char tbl[KD_MAX_WIDTH] =
{
    0,
    1 << KG_SHIFT,
    (1 << KG_ALTGR),
    (1 << KG_ALTGR) | (1 << KG_SHIFT)
};

static void
readKernelMapping(KdKeyboardInfo *ki)
{
    KeySym	    *k;
    int		    i, j;
    struct kbentry  kbe;
    int		    minKeyCode, maxKeyCode;
    int		    row;
    int             fd;

    if (!ki)
        return;

    fd = LinuxConsoleFd;
    
    minKeyCode = NR_KEYS;
    maxKeyCode = 0;
    row = 0;
    ki->keySyms.mapWidth = KD_MAX_WIDTH;
    for (i = 0; i < NR_KEYS && row < KD_MAX_LENGTH; ++i)
    {
        kbe.kb_index = LNX_KEY_INDEX(i);

        k = ki->keySyms.map + row * ki->keySyms.mapWidth;
	
	for (j = 0; j < ki->keySyms.mapWidth; ++j)
	{
	    unsigned short kval;

	    k[j] = NoSymbol;

	    kbe.kb_table = tbl[j];
	    kbe.kb_value = 0;
	    if (ioctl(fd, KDGKBENT, &kbe))
		continue;

	    kval = KVAL(kbe.kb_value);
	    switch (KTYP(kbe.kb_value))
	    {
	    case KT_LATIN:
	    case KT_LETTER:
		k[j] = linux_to_x[kval];
		break;

	    case KT_FN:
		if (kval <= 19)
		    k[j] = XK_F1 + kval;
		else switch (kbe.kb_value)
		{
		case K_FIND:
		    k[j] = XK_Home; /* or XK_Find */
		    break;
		case K_INSERT:
		    k[j] = XK_Insert;
		    break;
		case K_REMOVE:
		    k[j] = XK_Delete;
		    break;
		case K_SELECT:
		    k[j] = XK_End; /* or XK_Select */
		    break;
		case K_PGUP:
		    k[j] = XK_Prior;
		    break;
		case K_PGDN:
		    k[j] = XK_Next;
		    break;
		case K_HELP:
		    k[j] = XK_Help;
		    break;
		case K_DO:
		    k[j] = XK_Execute;
		    break;
		case K_PAUSE:
		    k[j] = XK_Pause;
		    break;
		case K_MACRO:
		    k[j] = XK_Menu;
		    break;
		default:
		    break;
		}
		break;

	    case KT_SPEC:
		switch (kbe.kb_value)
		{
		case K_ENTER:
		    k[j] = XK_Return;
		    break;
		case K_BREAK:
		    k[j] = XK_Break;
		    break;
		case K_CAPS:
		    k[j] = XK_Caps_Lock;
		    break;
		case K_NUM:
		    k[j] = XK_Num_Lock;
		    break;
		case K_HOLD:
		    k[j] = XK_Scroll_Lock;
		    break;
		case K_COMPOSE:
		    k[j] = XK_Multi_key;
		    break;
		default:
		    break;
		}
		break;

	    case KT_PAD:
		switch (kbe.kb_value)
		{
		case K_PPLUS:
		    k[j] = XK_KP_Add;
		    break;
		case K_PMINUS:
		    k[j] = XK_KP_Subtract;
		    break;
		case K_PSTAR:
		    k[j] = XK_KP_Multiply;
		    break;
		case K_PSLASH:
		    k[j] = XK_KP_Divide;
		    break;
		case K_PENTER:
		    k[j] = XK_KP_Enter;
		    break;
		case K_PCOMMA:
		    k[j] = XK_KP_Separator;
		    break;
		case K_PDOT:
		    k[j] = XK_KP_Decimal;
		    break;
		case K_PPLUSMINUS:
		    k[j] = XK_KP_Subtract;
		    break;
		default:
		    if (kval <= 9)
			k[j] = XK_KP_0 + kval;
		    break;
		}
		break;

		/*
		 * KT_DEAD keys are for accelerated diacritical creation.
		 */
	    case KT_DEAD:
		switch (kbe.kb_value)
		{
		case K_DGRAVE:
		    k[j] = XK_dead_grave;
		    break;
		case K_DACUTE:
		    k[j] = XK_dead_acute;
		    break;
		case K_DCIRCM:
		    k[j] = XK_dead_circumflex;
		    break;
		case K_DTILDE:
		    k[j] = XK_dead_tilde;
		    break;
		case K_DDIERE:
		    k[j] = XK_dead_diaeresis;
		    break;
		}
		break;

	    case KT_CUR:
		switch (kbe.kb_value)
		{
		case K_DOWN:
		    k[j] = XK_Down;
		    break;
		case K_LEFT:
		    k[j] = XK_Left;
		    break;
		case K_RIGHT:
		    k[j] = XK_Right;
		    break;
		case K_UP:
		    k[j] = XK_Up;
		    break;
		}
		break;

	    case KT_SHIFT:
		switch (kbe.kb_value)
		{
		case K_ALTGR:
		    k[j] = XK_Mode_switch;
		    break;
		case K_ALT:
		    k[j] = (kbe.kb_index == 0x64 ?
			  XK_Alt_R : XK_Alt_L);
		    break;
		case K_CTRL:
		    k[j] = (kbe.kb_index == 0x61 ?
			  XK_Control_R : XK_Control_L);
		    break;
		case K_CTRLL:
		    k[j] = XK_Control_L;
		    break;
		case K_CTRLR:
		    k[j] = XK_Control_R;
		    break;
		case K_SHIFT:
		    k[j] = (kbe.kb_index == 0x36 ?
			  XK_Shift_R : XK_Shift_L);
		    break;
		case K_SHIFTL:
		    k[j] = XK_Shift_L;
		    break;
		case K_SHIFTR:
		    k[j] = XK_Shift_R;
		    break;
		default:
		    break;
		}
		break;

		/*
		 * KT_ASCII keys accumulate a 3 digit decimal number that gets
		 * emitted when the shift state changes. We can't emulate that.
		 */
	    case KT_ASCII:
		break;

	    case KT_LOCK:
		if (kbe.kb_value == K_SHIFTLOCK)
		    k[j] = XK_Shift_Lock;
		break;

#ifdef KT_X
	    case KT_X:
		/* depends on new keyboard symbols in file linux/keyboard.h */
		if(kbe.kb_value == K_XMENU) k[j] = XK_Menu;
		if(kbe.kb_value == K_XTELEPHONE) k[j] = XK_telephone;
		break;
#endif
#ifdef KT_XF
	    case KT_XF:
		/* special linux keysyms which map directly to XF86 keysyms */
		k[j] = (kbe.kb_value & 0xFF) + 0x1008FF00;
		break;
#endif
		
	    default:
		break;
	    }
	    if (i < minKeyCode)
		minKeyCode = i;
	    if (i > maxKeyCode)
		maxKeyCode = i;
	}

	if (minKeyCode == NR_KEYS)
	    continue;

	if (k[3] == k[2]) k[3] = NoSymbol;
	if (k[2] == k[1]) k[2] = NoSymbol;
	if (k[1] == k[0]) k[1] = NoSymbol;
	if (k[0] == k[2] && k[1] == k[3]) k[2] = k[3] = NoSymbol;
	if (k[3] == k[0] && k[2] == k[1] && k[2] == NoSymbol) k[3] =NoSymbol;
	row++;
    }
    ki->minScanCode = minKeyCode;
    ki->maxScanCode = maxKeyCode;
}

#ifdef XKB

/*
 * We need these to handle extended scancodes correctly (I could just use the
 * numbers below, but this makes the code more readable
 */

/* The prefix codes */
#define KEY_Prefix0      /* special               0x60  */   96
#define KEY_Prefix1      /* special               0x61  */   97

/* The raw scancodes */
#define KEY_Enter        /* Enter                 0x1c  */   28
#define KEY_LCtrl        /* Ctrl(left)            0x1d  */   29
#define KEY_Slash        /* / (Slash)   ?         0x35  */   53
#define KEY_KP_Multiply  /* *                     0x37  */   55
#define KEY_Alt          /* Alt(left)             0x38  */   56
#define KEY_F3           /* F3                    0x3d  */   61
#define KEY_F4           /* F4                    0x3e  */   62
#define KEY_F5           /* F5                    0x3f  */   63
#define KEY_F6           /* F6                    0x40  */   64
#define KEY_F7           /* F7                    0x41  */   65
#define KEY_ScrollLock   /* ScrollLock            0x46  */   70
#define KEY_KP_7         /* 7           Home      0x47  */   71
#define KEY_KP_8         /* 8           Up        0x48  */   72
#define KEY_KP_9         /* 9           PgUp      0x49  */   73
#define KEY_KP_Minus     /* - (Minus)             0x4a  */   74
#define KEY_KP_4         /* 4           Left      0x4b  */   75
#define KEY_KP_5         /* 5                     0x4c  */   76
#define KEY_KP_6         /* 6           Right     0x4d  */   77
#define KEY_KP_Plus      /* + (Plus)              0x4e  */   78
#define KEY_KP_1         /* 1           End       0x4f  */   79
#define KEY_KP_2         /* 2           Down      0x50  */   80
#define KEY_KP_3         /* 3           PgDown    0x51  */   81
#define KEY_KP_0         /* 0           Insert    0x52  */   82
#define KEY_KP_Decimal   /* . (Decimal) Delete    0x53  */   83
#define KEY_Home         /* Home                  0x59  */   89
#define KEY_Up           /* Up                    0x5a  */   90
#define KEY_PgUp         /* PgUp                  0x5b  */   91
#define KEY_Left         /* Left                  0x5c  */   92
#define KEY_Begin        /* Begin                 0x5d  */   93
#define KEY_Right        /* Right                 0x5e  */   94
#define KEY_End          /* End                   0x5f  */   95
#define KEY_Down         /* Down                  0x60  */   96
#define KEY_PgDown       /* PgDown                0x61  */   97
#define KEY_Insert       /* Insert                0x62  */   98
#define KEY_Delete       /* Delete                0x63  */   99
#define KEY_KP_Enter     /* Enter                 0x64  */  100
#define KEY_RCtrl        /* Ctrl(right)           0x65  */  101
#define KEY_Pause        /* Pause                 0x66  */  102
#define KEY_Print        /* Print                 0x67  */  103
#define KEY_KP_Divide    /* Divide                0x68  */  104
#define KEY_AltLang      /* AtlLang(right)        0x69  */  105
#define KEY_Break        /* Break                 0x6a  */  106
#define KEY_LMeta        /* Left Meta             0x6b  */  107
#define KEY_RMeta        /* Right Meta            0x6c  */  108
#define KEY_Menu         /* Menu                  0x6d  */  109
#define KEY_F13          /* F13                   0x6e  */  110
#define KEY_F14          /* F14                   0x6f  */  111
#define KEY_F15          /* F15                   0x70  */  112
#define KEY_F16          /* F16                   0x71  */  113
#define KEY_F17          /* F17                   0x72  */  114
#define KEY_KP_DEC       /* KP_DEC                0x73  */  115

#endif /* XKB */


static void
LinuxKeyboardRead (int fd, void *closure)
{
    unsigned char   buf[256], *b;
    int		    n;
    unsigned char   prefix = 0, scancode = 0;

    while ((n = read (fd, buf, sizeof (buf))) > 0) {
	b = buf;
	while (n--) {
#ifdef XKB
            if (!noXkbExtension) {
                /*
                 * With xkb we use RAW mode for reading the console, which allows us
                 * process extended scancodes.
                 *
                 * See if this is a prefix extending the following keycode
                 */
                if (!prefix && ((b[0] & 0x7f) == KEY_Prefix0))
                {
                        prefix = KEY_Prefix0;
#ifdef DEBUG
                        ErrorF("Prefix0");
#endif
                        /* swallow this up */
                        b++;
                        continue;
                }
                else if (!prefix && ((b[0] & 0x7f) == KEY_Prefix1))
                {
                        prefix = KEY_Prefix1;
                        ErrorF("Prefix1");
                        /* swallow this up */
                        b++;
                        continue;
                }
                scancode  = b[0] & 0x7f;

                switch (prefix) {
                        /* from xf86Events.c */
                        case KEY_Prefix0:
                        {
#ifdef DEBUG
                            ErrorF("Prefix0 scancode: 0x%02x\n", scancode);
#endif
                            switch (scancode) {
                                case KEY_KP_7:
                                    scancode = KEY_Home;      break;  /* curs home */
                                case KEY_KP_8:
                                    scancode = KEY_Up;        break;  /* curs up */
                                case KEY_KP_9:
                                    scancode = KEY_PgUp;      break;  /* curs pgup */
                                case KEY_KP_4:
                                    scancode = KEY_Left;      break;  /* curs left */
                                case KEY_KP_5:
                                    scancode = KEY_Begin;     break;  /* curs begin */
                                case KEY_KP_6:
                                    scancode = KEY_Right;     break;  /* curs right */
                                case KEY_KP_1:
                                    scancode = KEY_End;       break;  /* curs end */
                                case KEY_KP_2:
                                    scancode = KEY_Down;      break;  /* curs down */
                                case KEY_KP_3:
                                    scancode = KEY_PgDown;    break;  /* curs pgdown */
                                case KEY_KP_0:
                                    scancode = KEY_Insert;    break;  /* curs insert */
                                case KEY_KP_Decimal:
                                    scancode = KEY_Delete;    break;  /* curs delete */
                                case KEY_Enter:
                                    scancode = KEY_KP_Enter;  break;  /* keypad enter */
                                case KEY_LCtrl:
                                    scancode = KEY_RCtrl;     break;  /* right ctrl */
                                case KEY_KP_Multiply:
                                    scancode = KEY_Print;     break;  /* print */
                                case KEY_Slash:
                                    scancode = KEY_KP_Divide; break;  /* keyp divide */
                                case KEY_Alt:
                                    scancode = KEY_AltLang;   break;  /* right alt */
                                case KEY_ScrollLock:
                                    scancode = KEY_Break;     break;  /* curs break */
                                case 0x5b:
                                    scancode = KEY_LMeta;     break;
                                case 0x5c:
                                    scancode = KEY_RMeta;     break;
                                case 0x5d:
                                    scancode = KEY_Menu;      break;
                                case KEY_F3:
                                    scancode = KEY_F13;       break;
                                case KEY_F4:
                                    scancode = KEY_F14;       break;
                                case KEY_F5:
                                    scancode = KEY_F15;       break;
                                case KEY_F6:
                                    scancode = KEY_F16;       break;
                                case KEY_F7:
                                    scancode = KEY_F17;       break;
                                case KEY_KP_Plus:
                                    scancode = KEY_KP_DEC;    break;
                                /* Ignore virtual shifts (E0 2A, E0 AA, E0 36, E0 B6) */
                                case 0x2A:
                                case 0x36:
                                    b++;
                                    prefix = 0;
                                    continue;
                                default:
#ifdef DEBUG
                                    ErrorF("Unreported Prefix0 scancode: 0x%02x\n",
                                           scancode);
#endif
                                     /*
                                      * "Internet" keyboards are generating lots of new
                                      * codes.  Let them pass.  There is little consistency
                                      * between them, so don't bother with symbolic names at
                                      * this level.
                                      */
                                    scancode += 0x78;
                            }
                            break;
                        }

                        case KEY_Prefix1:
                        {
                            /* we do no handle these */
#ifdef DEBUG
                            ErrorF("Prefix1 scancode: 0x%02x\n", scancode);
#endif
                            b++;
                            prefix = 0;
                            continue;
                        }

                        default: /* should not happen*/
                        case 0: /* do nothing */
#ifdef DEBUG
                            ErrorF("Plain scancode: 0x%02x\n", scancode);
#endif
                            ;
                }

                prefix = 0;
            }
            /* without xkb we use mediumraw mode -- enqueue the scancode as is */
            else
#endif
                scancode = b[0] & 0x7f;
	    KdEnqueueKeyboardEvent (closure, scancode, b[0] & 0x80);
	    b++;
	}
    }
}

static int		LinuxKbdTrans;
static struct termios	LinuxTermios;

static Status
LinuxKeyboardEnable (KdKeyboardInfo *ki)
{
    struct termios nTty;
    unsigned char   buf[256];
    int		    n;
    int             fd;

    if (!ki)
        return !Success;

    fd = LinuxConsoleFd;
    ki->driverPrivate = (void *) fd;

    ioctl (fd, KDGKBMODE, &LinuxKbdTrans);
    tcgetattr (fd, &LinuxTermios);
#ifdef XKB
    if (!noXkbExtension)
        ioctl(fd, KDSKBMODE, K_RAW);
    else
#else
        ioctl(fd, KDSKBMODE, K_MEDIUMRAW);
#endif
    nTty = LinuxTermios;
    nTty.c_iflag = (IGNPAR | IGNBRK) & (~PARMRK) & (~ISTRIP);
    nTty.c_oflag = 0;
    nTty.c_cflag = CREAD | CS8;
    nTty.c_lflag = 0;
    nTty.c_cc[VTIME]=0;
    nTty.c_cc[VMIN]=1;
    cfsetispeed(&nTty, 9600);
    cfsetospeed(&nTty, 9600);
    tcsetattr(fd, TCSANOW, &nTty);
    /*
     * Flush any pending keystrokes
     */
    while ((n = read (fd, buf, sizeof (buf))) > 0)
	;
    KdRegisterFd (fd, LinuxKeyboardRead, ki);
    return Success;
}

static void
LinuxKeyboardDisable (KdKeyboardInfo *ki)
{
    int fd;
    
    if (!ki)
        return;

    fd = (int) ki->driverPrivate;

    KdUnregisterFd(ki, fd, FALSE);
    ioctl(fd, KDSKBMODE, LinuxKbdTrans);
    tcsetattr(fd, TCSANOW, &LinuxTermios);
}

static Status
LinuxKeyboardInit (KdKeyboardInfo *ki)
{
    if (!ki)
        return !Success;

    if (ki->path)
        xfree(ki->path);
    ki->path = KdSaveString("console");
    if (ki->name)
        xfree(ki->name);
    ki->name = KdSaveString("Linux console keyboard");

    readKernelMapping (ki);

    return Success;
}

static void
LinuxKeyboardLeds (KdKeyboardInfo *ki, int leds)
{
    if (!ki)
        return;

    ioctl ((int)ki->driverPrivate, KDSETLED, leds & 7);
}

KdKeyboardDriver LinuxKeyboardDriver = {
    "keyboard",
    .Init = LinuxKeyboardInit,
    .Enable = LinuxKeyboardEnable,
    .Leds = LinuxKeyboardLeds,
    .Disable = LinuxKeyboardDisable,
};