mirror of https://gitee.com/openkylin/qemu.git
90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/*
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* Gamepad style buttons connected to IRQ/GPIO lines
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*
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* Copyright (c) 2007 CodeSourcery.
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* Written by Paul Brook
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*
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* This code is licenced under the GPL.
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*/
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#include "hw.h"
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#include "devices.h"
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#include "console.h"
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typedef struct {
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qemu_irq irq;
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int keycode;
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uint8_t pressed;
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} gamepad_button;
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typedef struct {
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gamepad_button *buttons;
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int num_buttons;
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int extension;
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} gamepad_state;
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static void stellaris_gamepad_put_key(void * opaque, int keycode)
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{
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gamepad_state *s = (gamepad_state *)opaque;
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int i;
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int down;
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if (keycode == 0xe0 && !s->extension) {
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s->extension = 0x80;
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return;
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}
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down = (keycode & 0x80) == 0;
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keycode = (keycode & 0x7f) | s->extension;
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for (i = 0; i < s->num_buttons; i++) {
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if (s->buttons[i].keycode == keycode
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&& s->buttons[i].pressed != down) {
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s->buttons[i].pressed = down;
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qemu_set_irq(s->buttons[i].irq, down);
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}
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}
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s->extension = 0;
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}
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static const VMStateDescription vmstate_stellaris_button = {
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.name = "stellaris_button",
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.version_id = 0,
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.minimum_version_id = 0,
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.minimum_version_id_old = 0,
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.fields = (VMStateField[]) {
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VMSTATE_UINT8(pressed, gamepad_button),
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VMSTATE_END_OF_LIST()
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}
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};
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static const VMStateDescription vmstate_stellaris_gamepad = {
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.name = "stellaris_gamepad",
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.version_id = 1,
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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.fields = (VMStateField[]) {
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VMSTATE_INT32(extension, gamepad_state),
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VMSTATE_STRUCT_VARRAY_INT32(buttons, gamepad_state, num_buttons, 0,
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vmstate_stellaris_button, gamepad_button),
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VMSTATE_END_OF_LIST()
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}
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};
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/* Returns an array 5 ouput slots. */
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void stellaris_gamepad_init(int n, qemu_irq *irq, const int *keycode)
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{
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gamepad_state *s;
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int i;
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s = (gamepad_state *)qemu_mallocz(sizeof (gamepad_state));
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s->buttons = (gamepad_button *)qemu_mallocz(n * sizeof (gamepad_button));
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for (i = 0; i < n; i++) {
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s->buttons[i].irq = irq[i];
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s->buttons[i].keycode = keycode[i];
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}
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s->num_buttons = n;
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qemu_add_kbd_event_handler(stellaris_gamepad_put_key, s);
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vmstate_register(NULL, -1, &vmstate_stellaris_gamepad, s);
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}
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