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x86: register a platform RTC device if PNP doesn't describe it

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Most if not all x86 platforms have an RTC device, but sometimes the RTC
is not exposed as a PNP0b00/PNP0b01/PNP0b02 device in PNPBIOS or ACPI:

    http://bugzilla.kernel.org/show_bug.cgi?id=11580
    https://bugzilla.redhat.com/show_bug.cgi?id=451188

It's best if we can discover the RTC via PNP because then we know
which flavor of device it is, where it lives, and which IRQ it uses.

But if we can't, we should register a platform device using the
compiled-in RTC_PORT/RTC_IRQ resource assumptions.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Reported-by: Rik Theys <rik.theys@esat.kuleuven.be>
Reported-by: shr_msn@yahoo.com.tw
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bjorn Helgaas 2008-10-14 17:01:03 -06:00 committed by Linus Torvalds
parent a474aaedac
commit 758a7f7bb8
1 changed files with 18 additions and 4 deletions
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22
arch/x86/kernel/rtc.c
View file

@ -223,11 +223,25 @@ static struct platform_device rtc_device = {
static __init int add_rtc_cmos(void)
{
#ifdef CONFIG_PNP
if (!pnp_platform_devices)
static const char *ids[] __initconst =
{ "PNP0b00", "PNP0b01", "PNP0b02", };
struct pnp_dev *dev;
struct pnp_id *id;
int i;
pnp_for_each_dev(dev) {
for (id = dev->id; id; id = id->next) {
for (i = 0; i < ARRAY_SIZE(ids); i++) {
if (compare_pnp_id(id, ids[i]) != 0)
return 0;
}
}
}
#endif
platform_device_register(&rtc_device);
#else
platform_device_register(&rtc_device);
#endif /* CONFIG_PNP */
dev_info(&rtc_device.dev,
"registered platform RTC device (no PNP device found)\n");
return 0;
}
device_initcall(add_rtc_cmos);