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/*
* 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);
}
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