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authorJiang Liu <jiang.liu@linux.intel.com>2013-12-19 20:38:10 +0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-01-05 16:07:14 +0100
commita65ac52041cccaf598995bc44340849027f1d79b (patch)
tree66feec04a0a904218e076cae1296dd3bbad862f6 /include/acpi
parente73be4a78b500374a1c42810dc073189036b4dd8 (diff)
downloadlinux-a65ac52041cccaf598995bc44340849027f1d79b.tar.bz2
ACPI: introduce helper interfaces for _DSM method
There are several drivers making use of ACPI _DSM method to detect and invoke device specific methods. Currently every driver has implemented its private version to support ACPI _DSM method. So this patch introduces three helper functions to support ACPI _DSM method, which will be used to replace open-coded versions. It helps to simplify code and improve code readability. Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/acpi')
-rw-r--r--include/acpi/acpi_bus.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index ddabed1f51c2..dd9b5edc7630 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -66,6 +66,32 @@ bool acpi_ata_match(acpi_handle handle);
bool acpi_bay_match(acpi_handle handle);
bool acpi_dock_match(acpi_handle handle);
+bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, int rev, u64 funcs);
+union acpi_object *acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid,
+ int rev, int func, union acpi_object *argv4);
+
+static inline union acpi_object *
+acpi_evaluate_dsm_typed(acpi_handle handle, const u8 *uuid, int rev, int func,
+ union acpi_object *argv4, acpi_object_type type)
+{
+ union acpi_object *obj;
+
+ obj = acpi_evaluate_dsm(handle, uuid, rev, func, argv4);
+ if (obj && obj->type != type) {
+ ACPI_FREE(obj);
+ obj = NULL;
+ }
+
+ return obj;
+}
+
+#define ACPI_INIT_DSM_ARGV4(cnt, eles) \
+ { \
+ .package.type = ACPI_TYPE_PACKAGE, \
+ .package.count = (cnt), \
+ .package.elements = (eles) \
+ }
+
#ifdef CONFIG_ACPI
#include <linux/proc_fs.h>