driver core: create write-only attribute macros for devices and drivers

This creates the macros DRIVER_ATTR_WO() and DEVICE_ATTR_WO() for
write-only attributes for drivers and devices.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 25d134e51f990962ecb54e5449c97b82f818ab30)
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

diff --git a/include/linux/device.h b/include/linux/device.h
index de1d2860fca55b3eeb566e83a7b7bbb33adc4bac..ddb4a1732d2048ad5715deed99518bf21a9d1d2b 100644 (file)
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -263,6 +263,8 @@ struct driver_attribute {
        struct driver_attribute driver_attr_##_name = __ATTR_RW(_name)
 #define DRIVER_ATTR_RO(_name) \
        struct driver_attribute driver_attr_##_name = __ATTR_RO(_name)
+#define DRIVER_ATTR_WO(_name) \
+       struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
 
 extern int __must_check driver_create_file(struct device_driver *driver,
                                        const struct driver_attribute *attr);
@@ -518,6 +520,8 @@ ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
        struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
 #define DEVICE_ATTR_RO(_name) \
        struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
+#define DEVICE_ATTR_WO(_name) \
+       struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
        struct dev_ext_attribute dev_attr_##_name = \
                { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }