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ACPI: updates rtc-cmos device platform_data 

Update ACPI to export its RTC extension information through platform_data
to the PNPACPI or platform bus device node used on the system being set up.

This will need to be updated later to provide a firmware hook to handle
system suspend with an alarm pending.

Len notes that "Eventually we may bundle ACPI/PNP/PNPACPI..." but if/when
that happens, ACPI can simplify this without my help.

And until it does, the separate patch creating a platform_device (on all
X86_PC systems, even without ACPI) will be needed.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
David Brownell 2007-02-05 16:09:11 -08:00 committed by Len Brown
parent 1c0f0575fd
commit a74388e21e
1 changed files with 89 additions and 0 deletions
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89
drivers/acpi/glue.c
View File

@ -241,3 +241,92 @@ static int __init init_acpi_device_notify(void)
}
arch_initcall(init_acpi_device_notify);
#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE)
/* Every ACPI platform has a mc146818 compatible "cmos rtc". Here we find
* its device node and pass extra config data. This helps its driver use
* capabilities that the now-obsolete mc146818 didn't have, and informs it
* that this board's RTC is wakeup-capable (per ACPI spec).
*/
#include <linux/mc146818rtc.h>
static struct cmos_rtc_board_info rtc_info;
#ifdef CONFIG_PNPACPI
/* PNP devices are registered in a subsys_initcall();
* ACPI specifies the PNP IDs to use.
*/
#include <linux/pnp.h>
static int __init pnp_match(struct device *dev, void *data)
{
static const char *ids[] = { "PNP0b00", "PNP0b01", "PNP0b02", };
struct pnp_dev *pnp = to_pnp_dev(dev);
int i;
for (i = 0; i < ARRAY_SIZE(ids); i++) {
if (compare_pnp_id(pnp->id, ids[i]) != 0)
return 1;
}
return 0;
}
static struct device *__init get_rtc_dev(void)
{
return bus_find_device(&pnp_bus_type, NULL, NULL, pnp_match);
}
#else
/* We expect non-PNPACPI platforms to register an RTC device, usually
* at or near arch_initcall(). That also helps for example PCs that
* aren't configured with ACPI (where this code wouldn't run, but the
* RTC would still be available). The device name matches the driver;
* that's how the platform bus works.
*/
#include <linux/platform_device.h>
static int __init platform_match(struct device *dev, void *data)
{
struct platform_device *pdev;
pdev = container_of(dev, struct platform_device, dev);
return strcmp(pdev->name, "rtc_cmos") == 0;
}
static struct device *__init get_rtc_dev(void)
{
return bus_find_device(&platform_bus_type, NULL, NULL, platform_match);
}
#endif
static int __init acpi_rtc_init(void)
{
struct device *dev = get_rtc_dev();
if (dev) {
rtc_info.rtc_day_alarm = acpi_gbl_FADT.day_alarm;
rtc_info.rtc_mon_alarm = acpi_gbl_FADT.month_alarm;
rtc_info.rtc_century = acpi_gbl_FADT.century;
/* NOTE: acpi_gbl_FADT->rtcs4 is NOT currently useful */
dev->platform_data = &rtc_info;
/* RTC always wakes from S1/S2/S3, and often S4/STD */
device_init_wakeup(dev, 1);
put_device(dev);
} else
pr_debug("ACPI: RTC unavailable?\n");
return 0;
}
/* do this between RTC subsys_initcall() and rtc_cmos driver_initcall() */
fs_initcall(acpi_rtc_init);
#endif