LXR qemu/hw/input/stellaris

   1/*
   2 * Gamepad style buttons connected to IRQ/GPIO lines
   3 *
   4 * Copyright (c) 2007 CodeSourcery.
   5 * Written by Paul Brook
   6 *
   7 * This code is licensed under the GPL.
   8 */
   9#include "qemu/osdep.h"
  10#include "hw/hw.h"
  11#include "hw/input/gamepad.h"
  12#include "ui/console.h"
  13
  14typedef struct {
  15    qemu_irq irq;
  16    int keycode;
  17    uint8_t pressed;
  18} gamepad_button;
  19
  20typedef struct {
  21    gamepad_button *buttons;
  22    int num_buttons;
  23    int extension;
  24} gamepad_state;
  25
  26static void stellaris_gamepad_put_key(void * opaque, int keycode)
  27{
  28    gamepad_state *s = (gamepad_state *)opaque;
  29    int i;
  30    int down;
  31
  32    if (keycode == 0xe0 && !s->extension) {
  33        s->extension = 0x80;
  34        return;
  35    }
  36
  37    down = (keycode & 0x80) == 0;
  38    keycode = (keycode & 0x7f) | s->extension;
  39
  40    for (i = 0; i < s->num_buttons; i++) {
  41        if (s->buttons[i].keycode == keycode
  42                && s->buttons[i].pressed != down) {
  43            s->buttons[i].pressed = down;
  44            qemu_set_irq(s->buttons[i].irq, down);
  45        }
  46    }
  47
  48    s->extension = 0;
  49}
  50
  51static const VMStateDescription vmstate_stellaris_button = {
  52    .name = "stellaris_button",
  53    .version_id = 0,
  54    .minimum_version_id = 0,
  55    .fields = (VMStateField[]) {
  56        VMSTATE_UINT8(pressed, gamepad_button),
  57        VMSTATE_END_OF_LIST()
  58    }
  59};
  60
  61static const VMStateDescription vmstate_stellaris_gamepad = {
  62    .name = "stellaris_gamepad",
  63    .version_id = 2,
  64    .minimum_version_id = 2,
  65    .fields = (VMStateField[]) {
  66        VMSTATE_INT32(extension, gamepad_state),
  67        VMSTATE_STRUCT_VARRAY_POINTER_INT32(buttons, gamepad_state,
  68                                            num_buttons,
  69                                            vmstate_stellaris_button,
  70                                            gamepad_button),
  71        VMSTATE_END_OF_LIST()
  72    }
  73};
  74
  75/* Returns an array of 5 output slots.  */
  76void stellaris_gamepad_init(int n, qemu_irq *irq, const int *keycode)
  77{
  78    gamepad_state *s;
  79    int i;
  80
  81    s = g_new0(gamepad_state, 1);
  82    s->buttons = g_new0(gamepad_button, n);
  83    for (i = 0; i < n; i++) {
  84        s->buttons[i].irq = irq[i];
  85        s->buttons[i].keycode = keycode[i];
  86    }
  87    s->num_buttons = n;
  88    qemu_add_kbd_event_handler(stellaris_gamepad_put_key, s);
  89    vmstate_register(NULL, -1, &vmstate_stellaris_gamepad, s);
  90}
  91