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;

    uint8_t 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 const VMStateDescription vmstate_stellaris_button = {

    .name = "stellaris_button",

    .version_id = 0,

    .minimum_version_id = 0,

    .minimum_version_id_old = 0,

    .fields      = (VMStateField[]) {

        VMSTATE_UINT8(pressed, gamepad_button),

        VMSTATE_END_OF_LIST()

    }

};

static const VMStateDescription vmstate_stellaris_gamepad = {

    .name = "stellaris_gamepad",

    .version_id = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .fields      = (VMStateField[]) {

        VMSTATE_INT32(extension, gamepad_state),

        VMSTATE_STRUCT_VARRAY_INT32(buttons, gamepad_state, num_buttons, 0,

                              vmstate_stellaris_button, gamepad_button),

        VMSTATE_END_OF_LIST()

    }

};

/* 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);

    vmstate_register(NULL, -1, &vmstate_stellaris_gamepad, s);

}