[patch 2.6.20-rc3 3/3] export ACPI info to rtc_cmos platform data

[David Brownell <david-b@pacbell.net>]

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.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

====
 drivers/acpi/glue.c |   89 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 89 insertions(+)

This will probably need to be updated later to provide a firmware hook
to handle system suspend with an alarm pending, with ACPI_EVENT_RTC.
The same hook could eventually need to handle EFI.

Index: g26/drivers/acpi/glue.c
===================================================================
--- g26.orig/drivers/acpi/glue.c	2007-01-02 20:05:31.000000000 -0800
+++ g26/drivers/acpi/glue.c	2007-01-02 23:35:44.000000000 -0800
@@ -364,3 +364,92 @@ static int __init init_acpi_device_notif
 }
 
 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_alrm;
+		rtc_info.rtc_mon_alarm = acpi_gbl_FADT->mon_alrm;
+		rtc_info.rtc_century = acpi_gbl_FADT->century;
+
+		/* NOTE:  acpi_gbl_FADT->rtcs4 is 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