1 files changed, 86 insertions, 0 deletions
diff --git a/arch/s390/include/asm/ccwgroup.h b/arch/s390/include/asm/ccwgroup.h
new file mode 100644
index 000000000..860cab747
--- /dev/null
+++ b/arch/s390/include/asm/ccwgroup.h
@@ -0,0 +1,86 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef S390_CCWGROUP_H
+#define S390_CCWGROUP_H
+
+struct ccw_device;
+struct ccw_driver;
+
+/**
+ * struct ccwgroup_device - ccw group device
+ * @state: online/offline state
+ * @count: number of attached slave devices
+ * @dev: embedded device structure
+ * @cdev: variable number of slave devices, allocated as needed
+ * @ungroup_work: work to be done when a ccwgroup notifier has action
+ *	type %BUS_NOTIFY_UNBIND_DRIVER
+ */
+struct ccwgroup_device {
+	enum {
+		CCWGROUP_OFFLINE,
+		CCWGROUP_ONLINE,
+	} state;
+/* private: */
+	atomic_t onoff;
+	struct mutex reg_mutex;
+/* public: */
+	unsigned int count;
+	struct device	dev;
+	struct work_struct ungroup_work;
+	struct ccw_device *cdev[0];
+};
+
+/**
+ * struct ccwgroup_driver - driver for ccw group devices
+ * @setup: function called during device creation to setup the device
+ * @remove: function called on remove
+ * @set_online: function called when device is set online
+ * @set_offline: function called when device is set offline
+ * @shutdown: function called when device is shut down
+ * @prepare: prepare for pm state transition
+ * @complete: undo work done in @prepare
+ * @freeze: callback for freezing during hibernation snapshotting
+ * @thaw: undo work done in @freeze
+ * @restore: callback for restoring after hibernation
+ * @driver: embedded driver structure
+ * @ccw_driver: supported ccw_driver (optional)
+ */
+struct ccwgroup_driver {
+	int (*setup) (struct ccwgroup_device *);
+	void (*remove) (struct ccwgroup_device *);
+	int (*set_online) (struct ccwgroup_device *);
+	int (*set_offline) (struct ccwgroup_device *);
+	void (*shutdown)(struct ccwgroup_device *);
+	int (*prepare) (struct ccwgroup_device *);
+	void (*complete) (struct ccwgroup_device *);
+	int (*freeze)(struct ccwgroup_device *);
+	int (*thaw) (struct ccwgroup_device *);
+	int (*restore)(struct ccwgroup_device *);
+
+	struct device_driver driver;
+	struct ccw_driver *ccw_driver;
+};
+
+extern int  ccwgroup_driver_register   (struct ccwgroup_driver *cdriver);
+extern void ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver);
+int ccwgroup_create_dev(struct device *root, struct ccwgroup_driver *gdrv,
+			int num_devices, const char *buf);
+
+extern int ccwgroup_set_online(struct ccwgroup_device *gdev);
+extern int ccwgroup_set_offline(struct ccwgroup_device *gdev);
+
+extern int ccwgroup_probe_ccwdev(struct ccw_device *cdev);
+extern void ccwgroup_remove_ccwdev(struct ccw_device *cdev);
+
+#define to_ccwgroupdev(x) container_of((x), struct ccwgroup_device, dev)
+#define to_ccwgroupdrv(x) container_of((x), struct ccwgroup_driver, driver)
+
+#if IS_ENABLED(CONFIG_CCWGROUP)
+bool dev_is_ccwgroup(struct device *dev);
+#else /* CONFIG_CCWGROUP */
+static inline bool dev_is_ccwgroup(struct device *dev)
+{
+	return false;
+}
+#endif /* CONFIG_CCWGROUP */
+
+#endif