C++ KBD_IS_ACTIVE函数代码示例

static int 
akbd_check(keyboard_t *kbd) 
{
	struct adb_kbd_softc *sc;

	if (!KBD_IS_ACTIVE(kbd))
		return (FALSE);

	sc = (struct adb_kbd_softc *)(kbd);

	mtx_lock(&sc->sc_mutex);
#ifdef AKBD_EMULATE_ATKBD
		if (sc->at_buffered_char[0]) {
			mtx_unlock(&sc->sc_mutex);
			return (TRUE);
		}
#endif

		if (sc->buffers > 0) {
			mtx_unlock(&sc->sc_mutex);
			return (TRUE); 
		}
	mtx_unlock(&sc->sc_mutex);

	return (FALSE);
}

static void
akbd_repeat(void *xsc) {
	struct adb_kbd_softc *sc = xsc;
	int notify_kbd = 0;

	/* Fake an up/down key repeat so long as we have the
	   free buffers */
	mtx_lock(&sc->sc_mutex);
		if (sc->buffers < 7) {
			sc->buffer[sc->buffers++] = sc->last_press | (1 << 7);
			sc->buffer[sc->buffers++] = sc->last_press;

			notify_kbd = 1;
		}
	mtx_unlock(&sc->sc_mutex);

	if (notify_kbd && KBD_IS_ACTIVE(&sc->sc_kbd) 
	    && KBD_IS_BUSY(&sc->sc_kbd)) {
		sc->sc_kbd.kb_callback.kc_func(&sc->sc_kbd,
		    KBDIO_KEYINPUT, sc->sc_kbd.kb_callback.kc_arg);
	}

	/* Reschedule the callout */
	callout_reset(&sc->sc_repeater, ms_to_ticks(sc->sc_kbd.kb_delay2),
	    akbd_repeat, sc);
}

/* check if data is waiting */
static int
pckbd_check(keyboard_t *kbd)
{
	if (!KBD_IS_ACTIVE(kbd))
		return FALSE;
	return kbdc_data_ready(((pckbd_state_t *)kbd->kb_data)->kbdc);
}

/* check if data is waiting */
static int
ckb_check(keyboard_t *kbd)
{
	struct ckb_softc *sc;
	int i;

	sc = kbd->kb_data;

	CKB_CTX_LOCK_ASSERT();

	if (!KBD_IS_ACTIVE(kbd))
		return (0);

	if (sc->sc_flags & CKB_FLAG_POLLING) {
		return (1);
	};

	for (i = 0; i < sc->cols; i++)
		if (sc->scan_local[i] != sc->scan[i]) {
			return (1);
		};

	if (sc->sc_repeating)
		return (1);

	return (0);
}

static int
sunkbd_check(keyboard_t *kbd)
{
	struct sunkbd_softc *sc;

	if (!KBD_IS_ACTIVE(kbd))
		return (FALSE);

	sc = (struct sunkbd_softc *)kbd;

#if defined(SUNKBD_EMULATE_ATKBD)
	if (sc->sc_buffered_char[0])
		return (TRUE);
#endif

	if (sc->sc_repeating)
		return (TRUE);

	if (sc->sc_uart != NULL && !uart_rx_empty(sc->sc_uart))
		return (TRUE);

	if (sc->sc_polling != 0 && sc->sc_sysdev != NULL &&
	    uart_rxready(sc->sc_sysdev))
		return (TRUE);

	return (FALSE);
}

/* keyboard interrupt routine */
static int
atkbd_intr(keyboard_t *kbd, void *arg)
{
	atkbd_state_t *state;
	int delay[2];
	int c;

	if (KBD_IS_ACTIVE(kbd) && KBD_IS_BUSY(kbd)) {
		/* let the callback function to process the input */
		(*kbd->kb_callback.kc_func)(kbd, KBDIO_KEYINPUT,
					    kbd->kb_callback.kc_arg);
	} else {
		/* read and discard the input; no one is waiting for input */
		do {
			c = atkbd_read_char(kbd, FALSE);
		} while (c != NOKEY);

		if (!KBD_HAS_DEVICE(kbd)) {
			/*
			 * The keyboard was not detected before;
			 * it must have been reconnected!
			 */
			state = (atkbd_state_t *)kbd->kb_data;
			init_keyboard(state->kbdc, &kbd->kb_type,
				      kbd->kb_config);
			atkbd_ioctl(kbd, KDSETLED, (caddr_t)&state->ks_state);
			get_typematic(kbd);
			delay[0] = kbd->kb_delay1;
			delay[1] = kbd->kb_delay2;
			atkbd_ioctl(kbd, KDSETREPEAT, (caddr_t)delay);
			KBD_FOUND_DEVICE(kbd);
		}
	}
	return 0;
}

static int 
akbd_check_char(keyboard_t *kbd) 
{
	if (!KBD_IS_ACTIVE(kbd))
		return (FALSE);

	return (akbd_check(kbd));
}

/* check if char is waiting */
static int
kmi_check_char_locked(keyboard_t *kbd)
{
	KMI_CTX_LOCK_ASSERT();

	if (!KBD_IS_ACTIVE(kbd))
		return (0);

	return (kmi_check(kbd));
}

/* check if char is waiting */
static int
ckb_check_char_locked(keyboard_t *kbd)
{
	CKB_CTX_LOCK_ASSERT();

	if (!KBD_IS_ACTIVE(kbd))
		return (0);

	return (ckb_check(kbd));
}

/* Currently unused. */
static int
ckb_read(keyboard_t *kbd, int wait)
{
	CKB_CTX_LOCK_ASSERT();

	if (!KBD_IS_ACTIVE(kbd))
		return (-1);

	printf("Implement ME: %s\n", __func__);
	return (0);
}

/* read one byte from the keyboard if it's allowed */
static int
pckbd_read(keyboard_t *kbd, int wait)
{
	int c;

	if (wait)
		c = read_kbd_data(((pckbd_state_t *)kbd->kb_data)->kbdc);
	else
		c = read_kbd_data_no_wait(((pckbd_state_t *)kbd->kb_data)->kbdc);
	return (KBD_IS_ACTIVE(kbd) ? c : -1);
}

/* check if char is waiting */
static int
pckbd_check_char(keyboard_t *kbd)
{
	pckbd_state_t *state;

	if (!KBD_IS_ACTIVE(kbd))
		return FALSE;
	state = (pckbd_state_t *)kbd->kb_data;
	if (!(state->ks_flags & COMPOSE) && (state->ks_composed_char > 0))
		return TRUE;
	return kbdc_data_ready(state->kbdc);
}

/* Currently unused. */
static int
kmi_read(keyboard_t *kbd, int wait)
{
	KMI_CTX_LOCK_ASSERT();

	if (!KBD_IS_ACTIVE(kbd))
		return (-1);

	++(kbd->kb_count);
	printf("Implement ME: %s\n", __func__);
	return (0);
}

/* check if data is waiting */
static int
ukbd_check(keyboard_t *kbd)
{
	if (!KBD_IS_ACTIVE(kbd))
		return FALSE;
#ifdef UKBD_EMULATE_ATSCANCODE
	if (((ukbd_state_t *)kbd->kb_data)->ks_buffered_char[0])
		return TRUE;
#endif
	if (((ukbd_state_t *)kbd->kb_data)->ks_inputs > 0)
		return TRUE;
	return FALSE;
}

static void
sunkbd_repeat(void *v)
{
	struct sunkbd_softc *sc = v;

	if (KBD_IS_ACTIVE(&sc->sc_kbd) && KBD_IS_BUSY(&sc->sc_kbd)) {
		if (sc->sc_repeat_key != -1) {
			sc->sc_repeating = 1;
			sc->sc_kbd.kb_callback.kc_func(&sc->sc_kbd,
			    KBDIO_KEYINPUT, sc->sc_kbd.kb_callback.kc_arg);
		}
	}
}