spmi: Add driver shutdown support

Add new shutdown() method. Use it in the standard driver model style.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Hsin-Hsiung Wang <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/spmi/spmi.c

···
 	return 0;
 }
 
+static void spmi_drv_shutdown(struct device *dev)
+{
+	const struct spmi_driver *sdrv = to_spmi_driver(dev->driver);
+
+	if (sdrv && sdrv->shutdown)
+		sdrv->shutdown(to_spmi_device(dev));
+}
+
 static int spmi_drv_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
 	int ret;
···
 	.match		= spmi_device_match,
 	.probe		= spmi_drv_probe,
 	.remove		= spmi_drv_remove,
+	.shutdown	= spmi_drv_shutdown,
 	.uevent		= spmi_drv_uevent,
 };
 

include/linux/spmi.h

···
 	struct device_driver driver;
 	int	(*probe)(struct spmi_device *sdev);
 	void	(*remove)(struct spmi_device *sdev);
+	void	(*shutdown)(struct spmi_device *sdev);
 };
 
 static inline struct spmi_driver *to_spmi_driver(struct device_driver *d)