/*
 * $Id$
 *
 * Copyright © 1999 Keith Packard
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Keith Packard not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Keith Packard makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#include "kdrive.h"
#include "kkeymap.h"
#include <linux/keyboard.h>
#include <linux/kd.h>
#include <X11/keysym.h>
#include <termios.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_Delete,
	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
};

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

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

    minKeyCode = NR_KEYS;
    maxKeyCode = 0;
    k = kdKeymap;
    for (i = 0; 
	 i < NR_KEYS && (maxKeyCode - minKeyCode + 1) < KD_MAX_LENGTH; 
	 ++i)
    {
	kbe.kb_index = i;

	for (j = 0; j < KD_MAX_WIDTH; ++j)
	{
	    unsigned short kval;

	    k[j] = NoSymbol;

	    kbe.kb_table = tbl[j];
	    if (ioctl(LinuxConsoleFd, 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_Alt_R;
		    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;

	    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;

	k += KD_MAX_WIDTH;
    }
    kdMinScanCode = minKeyCode;
    kdMaxScanCode = maxKeyCode;
}

void
LinuxKeyboardLoad (void)
{
    readKernelMapping ();
}

static int		LinuxKbdTrans;
static struct termios	LinuxTermios;

int
LinuxKeyboardInit (void)
{
    struct termios nTty;

    ioctl (LinuxConsoleFd, KDGKBMODE, &LinuxKbdTrans);
    tcgetattr (LinuxConsoleFd, &LinuxTermios);
    
    ioctl(LinuxConsoleFd, KDSKBMODE, K_MEDIUMRAW);
    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(LinuxConsoleFd, TCSANOW, &nTty);
    return LinuxConsoleFd;
}

void
LinuxKeyboardFini (int fd)
{
    ioctl(LinuxConsoleFd, KDSKBMODE, LinuxKbdTrans);
    tcsetattr(LinuxConsoleFd, TCSANOW, &LinuxTermios);
}

void
LinuxKeyboardRead (int fd)
{
    unsigned char   buf[256], *b;
    int		    n;

    while ((n = read (fd, buf, sizeof (buf))) > 0)
    {
	b = buf;
	while (n--)
	{
	    KdEnqueueKeyboardEvent (b[0] & 0x7f, b[0] & 0x80);
	    b++;
	}
    }
}

void
LinuxKeyboardLeds (int leds)
{
    ioctl (LinuxConsoleFd, KDSETLED, leds & 7);
}

void
LinuxKeyboardBell (int volume, int pitch, int duration)
{
    if (volume && pitch)
    {
	ioctl(LinuxConsoleFd, KDMKTONE,
	      ((1193190 / pitch) & 0xffff) |
	      (((unsigned long)duration *
		volume / 50) << 16));

    }
}

KdKeyboardFuncs	LinuxKeyboardFuncs = {
    LinuxKeyboardLoad,
    LinuxKeyboardInit,
    LinuxKeyboardRead,
    LinuxKeyboardLeds,
    LinuxKeyboardBell,
    LinuxKeyboardFini,
    3,
};