RTC: use fallback IRQ if PNP tables don't provide one

Intel Macs (and possibly other machines) provide a PNP entry for the RTC,
but provide no IRQ.  As a result the rtc-cmos driver doesn't allow wakeup
alarms.  If the RTC is located at the legacy ioport range, assume that it's
on IRQ 8 unless the tables say otherwise.
Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Matthieu CASTET <castet.matthieu@free.fr>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-cmos.c

@@ -641,6 +641,13 @@ cmos_pnp_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
 	 * drivers can't provide shutdown() methods to disable IRQs.
 	 * Or better yet, fix PNP to allow those methods...
 	 */
+	if (pnp_port_start(pnp,0) == 0x70 && !pnp_irq_valid(pnp,0))
+		/* Some machines contain a PNP entry for the RTC, but
+		 * don't define the IRQ. It should always be safe to
+		 * hardcode it in these cases
+		 */
+		return cmos_do_probe(&pnp->dev, &pnp->res.port_resource[0], 8);
+	else
 		return cmos_do_probe(&pnp->dev,
 				     &pnp->res.port_resource[0],
 				     pnp->res.irq_resource[0].start);