Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=729b2b...
Commit: 729b2bdbfa19dd9be98dbd49caf2773b3271cc24
Parent: 7180c4c9e09888db0a188f729c96c6d7bd61fa83
Author: Zhao Yakui <yakui.zhao@intel.com>
AuthorDate: Wed Mar 19 13:26:54 2008 +0800
Committer: Len Brown <len.brown@intel.com>
CommitDate: Wed Apr 9 21:57:22 2008 -0400
ACPI : Disable the device's ability to wake the sleeping system in the boot phase
In some machines some GPE is shared by several ACPI devices, for example:
sleep button, keyboard, mouse. At the same time one of them is
non-wake(runtime) device and the other are wake devices. In such case OSPM
should call the _PSW object to disable the device's ability to
wake the sleeping system in the boot phase.
Otherwise there will be ACPI interrupt flood triggered by the GPE input.
The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
So it is necessary to call _DSW object first. Only when it is not
present will the _PSW object used.
http://bugzilla.kernel.org/show_bug.cgi?id=10224
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---
drivers/acpi/scan.c | 43 ++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 42 insertions(+), 1 deletions(-)
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index e6ce262..bd32351 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -692,6 +692,9 @@ static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
acpi_status status = 0;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *package = NULL;
+ union acpi_object in_arg[3];
+ struct acpi_object_list arg_list = { 3, in_arg };
+ acpi_status psw_status = AE_OK;
struct acpi_device_id button_device_ids[] = {
{"PNP0C0D", 0},
@@ -700,7 +703,6 @@ static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
{"", 0},
};
-
/* _PRW */
status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
if (ACPI_FAILURE(status)) {
@@ -718,6 +720,45 @@ static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
kfree(buffer.pointer);
device->wakeup.flags.valid = 1;
+ /* Call _PSW/_DSW object to disable its ability to wake the sleeping
+ * system for the ACPI device with the _PRW object.
+ * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
+ * So it is necessary to call _DSW object first. Only when it is not
+ * present will the _PSW object used.
+ */
+ /*
+ * Three agruments are needed for the _DSW object.
+ * Argument 0: enable/disable the wake capabilities
+ * When _DSW object is called to disable the wake capabilities, maybe
+ * the first argument is filled. The value of the other two agruments
+ * is meaningless.
+ */
+ in_arg[0].type = ACPI_TYPE_INTEGER;
+ in_arg[0].integer.value = 0;
+ in_arg[1].type = ACPI_TYPE_INTEGER;
+ in_arg[1].integer.value = 0;
+ in_arg[2].type = ACPI_TYPE_INTEGER;
+ in_arg[2].integer.value = 0;
+ psw_status = acpi_evaluate_object(device->handle, "_DSW",
+ &arg_list, NULL);
+ if (ACPI_FAILURE(psw_status) && (psw_status != AE_NOT_FOUND))
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "error in evaluate _DSW\n"));
+ /*
+ * When the _DSW object is not present, OSPM will call _PSW object.
+ */
+ if (psw_status == AE_NOT_FOUND) {
+ /*
+ * Only one agruments is required for the _PSW object.
+ * agrument 0: enable/disable the wake capabilities
+ */
+ arg_list.count = 1;
+ in_arg[0].integer.value = 0;
+ psw_status = acpi_evaluate_object(device->handle, "_PSW",
+ &arg_list, NULL);
+ if (ACPI_FAILURE(psw_status) && (psw_status != AE_NOT_FOUND))
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "error in "
+ "evaluate _PSW\n"));
+ }
/* Power button, Lid switch always enable wakeup */
if (!acpi_match_device_ids(device, button_device_ids))
device->wakeup.flags.run_wake = 1;
--
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