Added basic (i.e. argumentless) control method execution. Now we can read fan speeds, cpu temperatures, laptop lid states, and all sorts of other glorious things.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@11545 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/drivers/ACPI.h

@@ -32,6 +32,10 @@ struct acpi_module_info {
 	status_t			(*get_next_entry) (uint32 object_type, const char *base, char *result, size_t len, void **counter);
 	status_t			(*get_device_hid) (const char *path, char *hid);
 	uint32				(*get_object_type) (const char *path);
+	
+	/* Control method execution and data acquisition */
+	
+	status_t			(*evaluate_object) (const char *object, void *return_value, size_t buf_len);
 };
 
 

src/add-ons/kernel/bus_managers/acpi/acpi_busman.c

@@ -21,6 +21,8 @@ status_t get_next_entry (uint32 object_type, const char *base, char *result, siz
 status_t get_device_hid (const char *path, char *hid);
 uint32 get_object_type (const char *path);
 
+status_t evaluate_object (const char *object, void *return_value, size_t buf_len);
+
 struct acpi_module_info acpi_module = {
 	{
 		{
@@ -177,3 +179,14 @@ uint32 get_object_type (const char *path) {
 	AcpiGetType(handle,&type);
 	return type;
 }
+
+status_t evaluate_object (const char *object, void *return_value, size_t buf_len) {
+	ACPI_BUFFER buffer;
+	ACPI_STATUS status;
+	
+	buffer.Pointer = return_value;
+	buffer.Length = buf_len;
+	
+	status = AcpiEvaluateObject(NULL,object,NULL,&buffer);
+	return (status == AE_OK) ? B_OK : B_ERROR;
+}