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 <[email protected]>
====
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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
