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>

1 files changed, 89 insertions, 0 deletions

diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 7b6c9ff9bebe..99500871e3fe 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -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