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>

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 1b4cf98..8df325d 100644 (file)
--- 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 d317da5..7400363 100644 (file)
--- 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 fb7171b..504af20 100644 (file)
--- 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
  */