[PATCH 3/3] platform/x86: wmi: Introduce to_wmi_driver()

[Armin Wolf <W_Armin@gmx.de>]

Introduce to_wmi_driver() as a replacement for dev_to_wdrv()
so WMI drivers can use this support macro instead of having
to duplicate its functionality.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
---
 drivers/platform/x86/wmi.c | 12 +++++-------
 include/linux/wmi.h        |  8 ++++++++
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index b2576d5189ed..646370bd6b03 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -653,8 +653,6 @@ char *wmi_get_acpi_device_uid(const char *guid_string)
 }
 EXPORT_SYMBOL_GPL(wmi_get_acpi_device_uid);

-#define drv_to_wdrv(__drv)	container_of_const(__drv, struct wmi_driver, driver)
-
 /*
  * sysfs interface
  */
@@ -802,7 +800,7 @@ static void wmi_dev_release(struct device *dev)

 static int wmi_dev_match(struct device *dev, const struct device_driver *driver)
 {
-	const struct wmi_driver *wmi_driver = drv_to_wdrv(driver);
+	const struct wmi_driver *wmi_driver = to_wmi_driver(driver);
 	struct wmi_block *wblock = dev_to_wblock(dev);
 	const struct wmi_device_id *id = wmi_driver->id_table;

@@ -826,7 +824,7 @@ static int wmi_dev_match(struct device *dev, const struct device_driver *driver)
 static int wmi_dev_probe(struct device *dev)
 {
 	struct wmi_block *wblock = dev_to_wblock(dev);
-	struct wmi_driver *wdriver = drv_to_wdrv(dev->driver);
+	struct wmi_driver *wdriver = to_wmi_driver(dev->driver);
 	int ret = 0;

 	/* Some older WMI drivers will break if instantiated multiple times,
@@ -870,7 +868,7 @@ static int wmi_dev_probe(struct device *dev)
 static void wmi_dev_remove(struct device *dev)
 {
 	struct wmi_block *wblock = dev_to_wblock(dev);
-	struct wmi_driver *wdriver = drv_to_wdrv(dev->driver);
+	struct wmi_driver *wdriver = to_wmi_driver(dev->driver);

 	down_write(&wblock->notify_lock);
 	wblock->driver_ready = false;
@@ -889,7 +887,7 @@ static void wmi_dev_shutdown(struct device *dev)
 	struct wmi_block *wblock;

 	if (dev->driver) {
-		wdriver = drv_to_wdrv(dev->driver);
+		wdriver = to_wmi_driver(dev->driver);
 		wblock = dev_to_wblock(dev);

 		/*
@@ -1173,7 +1171,7 @@ static int wmi_get_notify_data(struct wmi_block *wblock, union acpi_object **obj

 static void wmi_notify_driver(struct wmi_block *wblock, union acpi_object *obj)
 {
-	struct wmi_driver *driver = drv_to_wdrv(wblock->dev.dev.driver);
+	struct wmi_driver *driver = to_wmi_driver(wblock->dev.dev.driver);

 	if (!obj && !driver->no_notify_data) {
 		dev_warn(&wblock->dev.dev, "Event contains no event data\n");
diff --git a/include/linux/wmi.h b/include/linux/wmi.h
index fca5fd43c707..10751c8e5e6a 100644
--- a/include/linux/wmi.h
+++ b/include/linux/wmi.h
@@ -73,6 +73,14 @@ struct wmi_driver {
 	void (*notify)(struct wmi_device *device, union acpi_object *data);
 };

+/**
+ * to_wmi_driver() - Helper macro to cast a driver to a wmi_driver
+ * @drv: driver struct
+ *
+ * Cast a struct device_driver to a struct wmi_driver.
+ */
+#define to_wmi_driver(drv)	container_of_const(drv, struct wmi_driver, driver)
+
 extern int __must_check __wmi_driver_register(struct wmi_driver *driver,
 					      struct module *owner);
 extern void wmi_driver_unregister(struct wmi_driver *driver);
--
2.39.5