LXR qemu/hw/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 "hw.h"
  10#include "devices.h"
  11#include "console.h"
  12
  13typedef struct {
  14    qemu_irq irq;
  15    int keycode;
  16    uint8_t pressed;
  17} gamepad_button;
  18
  19typedef struct {
  20    gamepad_button *buttons;
  21    int num_buttons;
  22    int extension;
  23} gamepad_state;
  24
  25static void stellaris_gamepad_put_key(void * opaque, int keycode)
  26{
  27    gamepad_state *s = (gamepad_state *)opaque;
  28    int i;
  29    int down;
  30
  31    if (keycode == 0xe0 && !s->extension) {
  32        s->extension = 0x80;
  33        return;
  34    }
  35
  36    down = (keycode & 0x80) == 0;
  37    keycode = (keycode & 0x7f) | s->extension;
  38
  39    for (i = 0; i < s->num_buttons; i++) {
  40        if (s->buttons[i].keycode == keycode
  41                && s->buttons[i].pressed != down) {
  42            s->buttons[i].pressed = down;
  43            qemu_set_irq(s->buttons[i].irq, down);
  44        }
  45    }
  46
  47    s->extension = 0;
  48}
  49
  50static const VMStateDescription vmstate_stellaris_button = {
  51    .name = "stellaris_button",
  52    .version_id = 0,
  53    .minimum_version_id = 0,
  54    .minimum_version_id_old = 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 = 1,
  64    .minimum_version_id = 1,
  65    .minimum_version_id_old = 1,
  66    .fields      = (VMStateField[]) {
  67        VMSTATE_INT32(extension, gamepad_state),
  68        VMSTATE_STRUCT_VARRAY_INT32(buttons, gamepad_state, num_buttons, 0,
  69                              vmstate_stellaris_button, gamepad_button),
  70        VMSTATE_END_OF_LIST()
  71    }
  72};
  73
  74/* Returns an array 5 ouput slots.  */
  75void stellaris_gamepad_init(int n, qemu_irq *irq, const int *keycode)
  76{
  77    gamepad_state *s;
  78    int i;
  79
  80    s = (gamepad_state *)g_malloc0(sizeof (gamepad_state));
  81    s->buttons = (gamepad_button *)g_malloc0(n * sizeof (gamepad_button));
  82    for (i = 0; i < n; i++) {
  83        s->buttons[i].irq = irq[i];
  84        s->buttons[i].keycode = keycode[i];
  85    }
  86    s->num_buttons = n;
  87    qemu_add_kbd_event_handler(stellaris_gamepad_put_key, s);
  88    vmstate_register(NULL, -1, &vmstate_stellaris_gamepad, s);
  89}
  90