1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef S390_CCWGROUP_H
3 #define S390_CCWGROUP_H
4
5 struct ccw_device;
6 struct ccw_driver;
7
8 /**
9 * struct ccwgroup_device - ccw group device
10 * @state: online/offline state
11 * @count: number of attached slave devices
12 * @dev: embedded device structure
13 * @cdev: variable number of slave devices, allocated as needed
14 * @ungroup_work: work to be done when a ccwgroup notifier has action
15 * type %BUS_NOTIFY_UNBIND_DRIVER
16 */
17 struct ccwgroup_device {
18 enum {
19 CCWGROUP_OFFLINE,
20 CCWGROUP_ONLINE,
21 } state;
22 /* private: */
23 atomic_t onoff;
24 struct mutex reg_mutex;
25 /* public: */
26 unsigned int count;
27 struct device dev;
28 struct work_struct ungroup_work;
29 struct ccw_device *cdev[0];
30 };
31
32 /**
33 * struct ccwgroup_driver - driver for ccw group devices
34 * @setup: function called during device creation to setup the device
35 * @remove: function called on remove
36 * @set_online: function called when device is set online
37 * @set_offline: function called when device is set offline
38 * @shutdown: function called when device is shut down
39 * @driver: embedded driver structure
40 * @ccw_driver: supported ccw_driver (optional)
41 */
42 struct ccwgroup_driver {
43 int (*setup) (struct ccwgroup_device *);
44 void (*remove) (struct ccwgroup_device *);
45 int (*set_online) (struct ccwgroup_device *);
46 int (*set_offline) (struct ccwgroup_device *);
47 void (*shutdown)(struct ccwgroup_device *);
48
49 struct device_driver driver;
50 struct ccw_driver *ccw_driver;
51 };
52
53 extern int ccwgroup_driver_register (struct ccwgroup_driver *cdriver);
54 extern void ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver);
55 int ccwgroup_create_dev(struct device *root, struct ccwgroup_driver *gdrv,
56 int num_devices, const char *buf);
57 struct ccwgroup_device *get_ccwgroupdev_by_busid(struct ccwgroup_driver *gdrv,
58 char *bus_id);
59
60 extern int ccwgroup_set_online(struct ccwgroup_device *gdev);
61 extern int ccwgroup_set_offline(struct ccwgroup_device *gdev);
62
63 extern int ccwgroup_probe_ccwdev(struct ccw_device *cdev);
64 extern void ccwgroup_remove_ccwdev(struct ccw_device *cdev);
65
66 #define to_ccwgroupdev(x) container_of((x), struct ccwgroup_device, dev)
67 #define to_ccwgroupdrv(x) container_of((x), struct ccwgroup_driver, driver)
68
69 #if IS_ENABLED(CONFIG_CCWGROUP)
70 bool dev_is_ccwgroup(struct device *dev);
71 #else /* CONFIG_CCWGROUP */
dev_is_ccwgroup(struct device * dev)72 static inline bool dev_is_ccwgroup(struct device *dev)
73 {
74 return false;
75 }
76 #endif /* CONFIG_CCWGROUP */
77
78 #endif
79