kbd_vnc_ecos.c

eCos操作系统源码

//==========================================================================
//
//      kbd_vnc_ecos.c
//
//
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    Chris Garry <[e-mail]>
// Contributors:
// Date:         2003-08-22
// Purpose:
// Description:  Microwindows keyboard driver for VNC server on eCos
//
//####DESCRIPTIONEND####
//
//========================================================================*/

#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <pkgconf/vnc_server.h>  /* CYGDAT_VNC_SERVER_KEYBOARD_NAME */
#include "device.h"

static int  vnc_Open(KBDDEVICE *pkd);
static void vnc_Close(void);
static void vnc_GetModifierInfo(MWKEYMOD *modifiers, MWKEYMOD *curmodifiers);
static int  vnc_Read(MWKEY *kbuf, MWKEYMOD *modifiers, MWSCANCODE *scancode);

KBDDEVICE kbddev = {
	vnc_Open,
	vnc_Close,
	vnc_GetModifierInfo,
	vnc_Read,
	NULL
};

static int kbd_fd;  /* File descriptor for keyboard */
static MWKEYMOD current_mods;  /* Current keyboard modifiers */


static int vnc_Open(KBDDEVICE *pkd)
{
    /* Open the keyboard and get it ready for use */
    kbd_fd = open(CYGDAT_VNC_SERVER_KEYBOARD_NAME, O_RDONLY | O_NONBLOCK);

    if (kbd_fd < 0)
    {
        EPRINTF("%s - Can't open keyboard!\n", __FUNCTION__);
        return -1;
    }

    current_mods = MWKMOD_NONE;  /* Initialise the current modifiers */

    /* Keyboard opened okay - return file descriptor */
    return(kbd_fd);
}


static void vnc_Close(void)
{
    /* Close the mouse device. */
    if (kbd_fd >= 0)
    {
        close(kbd_fd);
    }

    kbd_fd = -1;
}


static void vnc_GetModifierInfo(MWKEYMOD *modifiers, MWKEYMOD *curmodifiers)
{
    if (modifiers)
    {
        *modifiers = MWKMOD_CTRL | MWKMOD_SHIFT | MWKMOD_ALT | MWKMOD_META
                   | MWKMOD_CAPS | MWKMOD_NUM | MWKMOD_SCR;
    }
    if (curmodifiers)
    {
        *curmodifiers = current_mods;
    }
}


/*
 * This reads one keystroke from the keyboard, and the current state of
 * the mode keys (ALT, SHIFT, CTRL).  Returns -1 on error, 1 if key is
 * pressed, and 0 if key was released.  This is a non-blocking call.
 */
static int vnc_Read(MWKEY *kbuf, MWKEYMOD *modifiers, MWSCANCODE *scancode)
{
    cyg_uint8 keystroke_buff[4];  /* Smal buffer to hold data for 1 keystroke */
    int bytes_read;

    /* Try to read the data for 1 keystroke event from the keyboard device */
    bytes_read = read(kbd_fd, keystroke_buff, 4);

    /* Each keystroke event generates 4 x cyg_uint8 values in the queue
     *   0: Padding - always zero
     *   1: Key pressed (1 when key is pressed)
     *   2: Keysym value MSB
     *   3: Keysym value LSB
     */

    if (bytes_read != 4)
    {
        return 0;
    }

    /* Log modifier bits and convert Keysym values to Unicode */
    switch(keystroke_buff[2]*256 + keystroke_buff[3])
    {
    case 0x0000 ... 0x007F:  /* Standard ASCII */
        *kbuf = keystroke_buff[3];
        break;

    case 0x0080 ... 0x00FF:  /* Not so sure what to do with these - but it works for '