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>

3 files changed, 38 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
    -------------------------------------------------------------------------- */
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index d317da5c6e9c..740036355722 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -1101,6 +1101,7 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 {
         int trips = 0;
         int result;
+        acpi_status status;
         int i;
 
         if (tz->trips.critical.flags.valid)
@@ -1129,6 +1130,15 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
         if (result)
                 return result;
 
+        status = acpi_attach_data(tz->device->handle,
+                                  acpi_bus_private_data_handler,
+                                  tz->thermal_zone);
+        if (ACPI_FAILURE(status)) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                "Error attaching device data\n"));
+                return -ENODEV;
+        }
+
         tz->tz_enabled = 1;
 
         printk(KERN_INFO PREFIX "%s is registered as thermal_zone%d\n",
@@ -1142,6 +1152,7 @@ static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
         thermal_zone_device_unregister(tz->thermal_zone);
         tz->thermal_zone = NULL;
+        acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 }
 
 
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index fb7171b1bd22..504af20b10c1 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -321,6 +321,8 @@ struct acpi_bus_event {
 
 extern struct kobject *acpi_kobj;
 extern int acpi_bus_generate_netlink_event(const char*, const char*, u8, int);
+void acpi_bus_private_data_handler(acpi_handle, u32, void *);
+int acpi_bus_get_private_data(acpi_handle, void **);
 /*
  * External Functions
  */