hw/input/stellaris_input.c

   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/hw.h"
  10 #include "hw/devices.h"
  11 #include "ui/console.h"
  12
  13 typedef struct {
  14     qemu_irq irq;
  15     int keycode;
  16     uint8_t pressed;
  17 } gamepad_button;
  18
  19 typedef struct {
  20     gamepad_button *buttons;
  21     int num_buttons;
  22     int extension;
  23 } gamepad_state;
  24
  25 static 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
  50 static const VMStateDescription vmstate_stellaris_button = {
  51     .name = "stellaris_button",
  52     .version_id = 0,
  53     .minimum_version_id = 0,
  54     .fields = (VMStateField[]) {
  55         VMSTATE_UINT8(pressed, gamepad_button),
  56         VMSTATE_END_OF_LIST()
  57     }
  58 };
  59
  60 static const VMStateDescription vmstate_stellaris_gamepad = {
  61     .name = "stellaris_gamepad",
  62     .version_id = 1,
  63     .minimum_version_id = 1,
  64     .fields = (VMStateField[]) {
  65         VMSTATE_INT32(extension, gamepad_state),
  66         VMSTATE_STRUCT_VARRAY_INT32(buttons, gamepad_state, num_buttons, 0,
  67                               vmstate_stellaris_button, gamepad_button),
  68         VMSTATE_END_OF_LIST()
  69     }
  70 };
  71
  72 /* Returns an array of 5 output slots.  */
  73 void stellaris_gamepad_init(int n, qemu_irq *irq, const int *keycode)
  74 {
  75     gamepad_state *s;
  76     int i;
  77
  78     s = g_new0(gamepad_state, 1);
  79     s->buttons = g_new0(gamepad_button, n);
  80     for (i = 0; i < n; i++) {
  81         s->buttons[i].irq = irq[i];
  82         s->buttons[i].keycode = keycode[i];
  83     }
  84     s->num_buttons = n;
  85     qemu_add_kbd_event_handler(stellaris_gamepad_put_key, s);
  86     vmstate_register(NULL, -1, &vmstate_stellaris_gamepad, s);
  87 }