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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>
This commit is contained in:
Matthew Garrett 2007-06-01 00:46:51 -07:00 committed by Linus Torvalds
parent 926b28984d
commit 6cd8fa87fb
1 changed files with 10 additions and 3 deletions
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13
drivers/rtc/rtc-cmos.c
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@ -641,9 +641,16 @@ 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...
*/
return cmos_do_probe(&pnp->dev,
&pnp->res.port_resource[0],
pnp->res.irq_resource[0].start);
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);
}
static void __exit cmos_pnp_remove(struct pnp_dev *pnp)