Subversion Repositories openrisc_me

/*

 * Copyright (c) 1999 Greg Haerr <greg@censoft.com>

 *

 * Keyboard Driver, PC bios version

 */

#include "device.h"

static int  KBD_Open(KBDDEVICE *pkd);

static void KBD_Close(void);

static void KBD_GetModifierInfo(int *modifiers);

static int  KBD_Read(MWUCHAR *buf, int *modifiers);

static int      KBD_Poll(void);

/* external routines in asmkbd.s*/

extern int kbpoll(void);

extern int kbread(void);

extern int kbflags(void);

KBDDEVICE kbddev = {

        KBD_Open,

        KBD_Close,

        KBD_GetModifierInfo,

        KBD_Read,

        KBD_Poll

};

/*

 * Open the keyboard.

 */

static int

KBD_Open(KBDDEVICE *pkd)

{

        return 1;

}

/*

 * Close the keyboard.

 */

static void

KBD_Close(void)

{

}

/*

 * Return the possible modifiers for the keyboard.

 */

static  void

KBD_GetModifierInfo(int *modifiers)

{

        *modifiers = 0;                  /* no modifiers available */

}

/*

 * This reads one keystroke from the keyboard, and the current state of

 * the mode keys (ALT, SHIFT, CTRL).  Returns -1 on error, 0 if no data

 * is ready, and 1 if data was read.  This is a non-blocking call.

 */

static int

KBD_Read(MWUCHAR *buf, int *modifiers)

{

        /* wait until a char is ready*/

        if(!kbpoll())

                return 0;

        /* read keyboard shift status*/

        *modifiers = kbflags();

        /* read keyboard character*/

        *buf = kbread();

        if(*buf == 0x1b)                        /* special case ESC*/

                return -2;

        return 1;

}

static int

KBD_Poll(void)

{

        return kbpoll();

}