Add an identify method that creates a pmtimer0 device if it doesn't alreedy

exist.  Hints are no longer needed to instantiate a pmtimer(4) device.

1 files changed, 19 insertions, 2 deletions

diff --git a/sys/i386/isa/pmtimer.c b/sys/i386/isa/pmtimer.c
index 35448e4..fcb6f49 100644
--- a/sys/i386/isa/pmtimer.c
+++ b/sys/i386/isa/pmtimer.c
@@ -40,11 +40,29 @@
 
 #include <isa/isavar.h>
 
+static devclass_t pmtimer_devclass;
+
 /* reject any PnP devices for now */
 static struct isa_pnp_id pmtimer_ids[] = {
 	{0}
 };
 
+static void
+pmtimer_identify(driver_t *driver, device_t parent)
+{
+	device_t child;
+
+	/*
+	 * Only add a child if one doesn't exist already.
+	 */
+	child = devclass_get_device(pmtimer_devclass, 0);
+	if (child == NULL) {
+		child = BUS_ADD_CHILD(parent, 0, "pmtimer", 0);
+		if (child == NULL)
+			panic("pmtimer_identify");
+	}
+}
+
 static int
 pmtimer_probe(device_t dev)
 {
@@ -121,6 +139,7 @@ pmtimer_resume(device_t dev)
 
 static device_method_t pmtimer_methods[] = {
 	/* Device interface */
+	DEVMETHOD(device_identify,	pmtimer_identify),
 	DEVMETHOD(device_probe,		pmtimer_probe),
 	DEVMETHOD(device_attach,	bus_generic_attach),
 	DEVMETHOD(device_suspend,	pmtimer_suspend),
@@ -134,6 +153,4 @@ static driver_t pmtimer_driver = {
 	1,		/* no softc */
 };
 
-static devclass_t pmtimer_devclass;
-
 DRIVER_MODULE(pmtimer, isa, pmtimer_driver, pmtimer_devclass, 0, 0);