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Subject[RFC PATCH 1/2] ACPICA: Add acpi_check_gpe_method() to check GPE method
Date
This patch is to expose acpi_check_gpe_method() to check whether there
is a GPE method for the given gpe. Enabling ACPI button devices' gpes
will depend on the new function's result.

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
---
drivers/acpi/acpica/evxface.c | 39 ++++++++++++++++++++++++++++++++++++++-
include/acpi/acpixf.h | 3 +++
2 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/acpica/evxface.c b/drivers/acpi/acpica/evxface.c
index 11e5803..0fcb248 100644
--- a/drivers/acpi/acpica/evxface.c
+++ b/drivers/acpi/acpica/evxface.c
@@ -717,6 +717,44 @@ ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)

/*******************************************************************************
*
+ * FUNCTION: acpi_check_gpe_method
+ *
+ * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
+ * defined GPEs)
+ * gpe_number - The event to remove a handler
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Check whether the given GPE has associated event method.
+ *
+ ******************************************************************************/
+acpi_status
+acpi_check_gpe_method(acpi_handle gpe_device, u32 gpe_number)
+{
+ struct acpi_gpe_event_info *gpe_event_info;
+ acpi_status status = AE_NOT_EXIST;
+ acpi_cpu_flags flags;
+
+ ACPI_FUNCTION_TRACE(acpi_check_gpe_method);
+
+ flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+ gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
+ if (!gpe_event_info) {
+ status = AE_ERROR;
+ goto unlock_and_exit;
+ }
+
+ if (gpe_event_info->flags & ACPI_GPE_DISPATCH_METHOD)
+ status = AE_OK;
+
+unlock_and_exit:
+ acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+ return status;
+}
+ACPI_EXPORT_SYMBOL(acpi_check_gpe_method)
+
+/*******************************************************************************
+ *
* FUNCTION: acpi_install_gpe_handler
*
* PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
@@ -821,7 +859,6 @@ free_and_exit:
ACPI_FREE(handler);
goto unlock_and_exit;
}
-
ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)

/*******************************************************************************
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index 35b525c..5b475c6 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -554,6 +554,9 @@ ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status
address,
void *context))
ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status
+ acpi_check_gpe_method(acpi_handle gpe_device,
+ u32 gpe_number))
+ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status
acpi_remove_gpe_handler(acpi_handle gpe_device,
u32 gpe_number,
acpi_gpe_handler
--
1.8.4.rc0.1.g8f6a3e5.dirty


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