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Viewing changes to hw/stellaris_input.c

  • Committer: Bazaar Package Importer
  • Author(s): Serge Hallyn
  • Date: 2011-10-19 10:44:56 UTC
  • Revision ID: james.westby@ubuntu.com-20111019104456-xgvskumk3sxi97f4
Tags: upstream-0.15.0+noroms
Import upstream version 0.15.0+noroms

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hw/stellaris_input.c
 
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/*
 
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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 licensed 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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}