HID: intel-ish-hid: ishtp: add helper function for driver data get/set

Add helper function ishtp_set_drvdata() and ishtp_get_drvdata() for
different ISH client drivers to set/get private driver data.

Signed-off-by: Even Xu <even.xu@intel.com>
Reviewed-by: Andriy Shevchenko <andriy.shevchenko@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/intel-ish-hid/ishtp/bus.c

@@ -563,6 +563,33 @@ void ishtp_put_device(struct ishtp_cl_device *cl_device)
 }
 EXPORT_SYMBOL(ishtp_put_device);
 
+/**
+ * ishtp_set_drvdata() - set client driver data
+ * @cl_device:	client device instance
+ * @data:	driver data need to be set
+ *
+ * Set client driver data to cl_device->driver_data.
+ */
+void ishtp_set_drvdata(struct ishtp_cl_device *cl_device, void *data)
+{
+	cl_device->driver_data = data;
+}
+EXPORT_SYMBOL(ishtp_set_drvdata);
+
+/**
+ * ishtp_get_drvdata() - get client driver data
+ * @cl_device:	client device instance
+ *
+ * Get client driver data from cl_device->driver_data.
+ *
+ * Return: pointer of driver data
+ */
+void *ishtp_get_drvdata(struct ishtp_cl_device *cl_device)
+{
+	return cl_device->driver_data;
+}
+EXPORT_SYMBOL(ishtp_get_drvdata);
+
 /**
  * ishtp_bus_new_client() - Create a new client
  * @dev:	ISHTP device instance

drivers/hid/intel-ish-hid/ishtp/bus.h

@@ -101,6 +101,9 @@ void	ishtp_reset_compl_handler(struct ishtp_device *dev);
 void	ishtp_put_device(struct ishtp_cl_device *);
 void	ishtp_get_device(struct ishtp_cl_device *);
 
+void	ishtp_set_drvdata(struct ishtp_cl_device *cl_device, void *data);
+void	*ishtp_get_drvdata(struct ishtp_cl_device *cl_device);
+
 int	__ishtp_cl_driver_register(struct ishtp_cl_driver *driver,
 				   struct module *owner);
 #define ishtp_cl_driver_register(driver)		\