ACPI: attach thermal zone info

Intel menlow driver needs to get the pointer of themal_zone_device
structure of an ACPI thermal zone.
Attach this to each ACPI thermal zone device object.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Thomas Sujith <sujith.thomas@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 1b4cf984b081..8df325dafe0f 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -122,6 +122,31 @@ int acpi_bus_get_status(struct acpi_device *device)
 
 EXPORT_SYMBOL(acpi_bus_get_status);
 
+void acpi_bus_private_data_handler(acpi_handle handle,
+                                   u32 function, void *context)
+{
+        return;
+}
+EXPORT_SYMBOL(acpi_bus_private_data_handler);
+
+int acpi_bus_get_private_data(acpi_handle handle, void **data)
+{
+        acpi_status status = AE_OK;
+
+        if (!*data)
+                return -EINVAL;
+
+        status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
+        if (ACPI_FAILURE(status) || !*data) {
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
+                                handle));
+                return -ENODEV;
+        }
+
+        return 0;
+}
+EXPORT_SYMBOL(acpi_bus_get_private_data);
+
 /* --------------------------------------------------------------------------
                                  Power Management
    -------------------------------------------------------------------------- */