- Sprinkle some KBD_IS_* and KBD_*_DONE macros in sunkbd_configure() as

a band-aid allowing to call this function savely multiple times, e.g.
  during sckbdprobe() and sc_probe_unit(). Otherwise calling it a second
  time results in a non-working keyboard. This needs a lot of more work
  to actually do the right thing and work like expected.
- Let sunkbd_configure() return the number of the found keyboards, i.e.
  1 in case probing succeeds, as it's expected. The return values of the
  keyboard configure functions however currently aren't checked so this
  doesn't make a difference at the moment.
- Use FBSDID.

sys/dev/uart/uart_kbd_sun.c

@@ -22,10 +22,11 @@
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
- *
- * $FreeBSD$
  */
 
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
 #include "opt_kbd.h"
 
 #include <sys/param.h>
@@ -189,6 +190,10 @@ sunkbd_configure(int flags)
 {
 	struct sunkbd_softc *sc;
 
+	if (KBD_IS_CONFIGURED(&sunkbd_softc.sc_kbd))
+		goto found;
+
+	if (!KBD_IS_INITIALIZED(&sunkbd_softc.sc_kbd)) {
 		if (uart_cpu_getdev(UART_DEV_KEYBOARD, &uart_keyboard))
 			return (0);
 		if (uart_probe(&uart_keyboard))
@@ -198,6 +203,8 @@ sunkbd_configure(int flags)
 		uart_keyboard.type = UART_DEV_KEYBOARD;
 		uart_keyboard.attach = sunkbd_attach;
 		uart_add_sysdev(&uart_keyboard);
+		KBD_INIT_DONE(&sunkbd_softc.sc_kbd);
+	}
 
 	if (sunkbd_probe_keyboard(&uart_keyboard) == -1)
 		return (0);
@@ -215,8 +222,11 @@ sunkbd_configure(int flags)
 	kbd_register(&sc->sc_kbd);
 
 	sc->sc_sysdev = &uart_keyboard;
+	KBD_CONFIG_DONE(&sc->sc_kbd);
 
-	return (0);
+ found:
+	/* Return number of found keyboards. */
+	return (1);
 }
 
 static int