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diff --git a/sys/dev/acpi_support/acpi_wmi_if.m b/sys/dev/acpi_support/acpi_wmi_if.m
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+#-
+# Copyright (c) 2009 Michael Gmelin
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+#
+
+#include <sys/bus.h>
+#include <sys/types.h>
+#include <contrib/dev/acpica/include/acpi.h>
+
+INTERFACE acpi_wmi;
+
+#
+# Default implementation for acpi_wmi_generic_provides_guid_string().
+#
+CODE {
+ static int
+ acpi_wmi_generic_provides_guid_string(device_t dev, const char* guid_string)
+ {
+ return 0;
+ }
+};
+
+
+#
+# Check if given GUID exists in WMI
+#
+# device_t dev: Device to probe
+# const char* guid_string: String form of the GUID
+#
+METHOD int provides_guid_string {
+ device_t dev;
+ const char* guid_string;
+} DEFAULT acpi_wmi_generic_provides_guid_string;
+
+#
+# Evaluate a WMI method call
+#
+# device_t dev: Device to use
+# const char* guid_string: String form of the GUID
+# UINT8 instance: instance id
+# UINT32 method_id: method to call
+# const ACPI_BUFFER* in: input data
+# ACPI_BUFFER* out: output buffer
+#
+METHOD ACPI_STATUS evaluate_call {
+ device_t dev;
+ const char *guid_string;
+ UINT8 instance;
+ UINT32 method_id;
+ const ACPI_BUFFER *in;
+ ACPI_BUFFER *out;
+};
+
+#
+# Get content of a WMI block
+#
+# device_t dev: Device to use
+# const char* guid_string: String form of the GUID
+# UINT8 instance: instance id
+# ACPI_BUFFER* out: output buffer
+#
+METHOD ACPI_STATUS get_block {
+ device_t dev;
+ const char *guid_string;
+ UINT8 instance;
+ ACPI_BUFFER *out;
+};
+#
+# Write to a WMI data block
+#
+# device_t dev: Device to use
+# const char* guid_string: String form of the GUID
+# UINT8 instance: instance id
+# const ACPI_BUFFER* in: input data
+#
+METHOD ACPI_STATUS set_block {
+ device_t dev;
+ const char *guid_string;
+ UINT8 instance;
+ const ACPI_BUFFER *in;
+};
+
+#
+# Install wmi event handler
+#
+# device_t dev: Device to use
+# const char* guid_string: String form of the GUID
+# ACPI_NOTIFY_HANDLER handler: Handler
+# void* data: Payload
+#
+METHOD ACPI_STATUS install_event_handler {
+ device_t dev;
+ const char *guid_string;
+ ACPI_NOTIFY_HANDLER handler;
+ void *data;
+};
+
+#
+# Remove wmi event handler
+#
+# device_t dev: Device to use
+# const char* guid_string: String form of the GUID
+#
+METHOD ACPI_STATUS remove_event_handler {
+ device_t dev;
+ const char *guid_string;
+};
+
+
+#
+# Get event data associated to an event
+#
+# device_t dev: Device to use
+# UINT32 event_id: event id
+# ACPI_BUFFER* out: output buffer
+#
+METHOD ACPI_STATUS get_event_data {
+ device_t dev;
+ UINT32 event_id;
+ ACPI_BUFFER *out;
+};