Archipelago » qemu

/*

 * Gamepad style buttons connected to IRQ/GPIO lines

 *

 * Copyright (c) 2007 CodeSourcery.

 * Written by Paul Brook

 *

 * This code is licenced under the GPL.

 */

#include "hw.h"

#include "devices.h"

#include "console.h"

typedef struct {

    qemu_irq irq;

    int keycode;

    int pressed;

} gamepad_button;

typedef struct {

    gamepad_button *buttons;

    int num_buttons;

    int extension;

} gamepad_state;

static void stellaris_gamepad_put_key(void * opaque, int keycode)

{

    gamepad_state *s = (gamepad_state *)opaque;

    int i;

    int down;

    if (keycode == 0xe0 && !s->extension) {

        s->extension = 0x80;

        return;

    }

    down = (keycode & 0x80) == 0;

    keycode = (keycode & 0x7f) | s->extension;

    for (i = 0; i < s->num_buttons; i++) {

        if (s->buttons[i].keycode == keycode

                && s->buttons[i].pressed != down) {

            s->buttons[i].pressed = down;

            qemu_set_irq(s->buttons[i].irq, down);

        }

    }

    s->extension = 0;

}

static void stellaris_gamepad_save(QEMUFile *f, void *opaque)

{

    gamepad_state *s = (gamepad_state *)opaque;

    int i;

    qemu_put_be32(f, s->extension);

    for (i = 0; i < s->num_buttons; i++)

        qemu_put_byte(f, s->buttons[i].pressed);

}

static int stellaris_gamepad_load(QEMUFile *f, void *opaque, int version_id)

{

    gamepad_state *s = (gamepad_state *)opaque;

    int i;

    if (version_id != 1)

        return -EINVAL;

    s->extension = qemu_get_be32(f);

    for (i = 0; i < s->num_buttons; i++)

        s->buttons[i].pressed = qemu_get_byte(f);

    return 0;

}

/* Returns an array 5 ouput slots.  */

void stellaris_gamepad_init(int n, qemu_irq *irq, const int *keycode)

{

    gamepad_state *s;

    int i;

    s = (gamepad_state *)qemu_mallocz(sizeof (gamepad_state));

    s->buttons = (gamepad_button *)qemu_mallocz(n * sizeof (gamepad_button));

    for (i = 0; i < n; i++) {

        s->buttons[i].irq = irq[i];

        s->buttons[i].keycode = keycode[i];

    }

    s->num_buttons = n;

    qemu_add_kbd_event_handler(stellaris_gamepad_put_key, s);

    register_savevm("stellaris_gamepad", -1, 1,

                    stellaris_gamepad_save, stellaris_gamepad_load, s);

}