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: used to ungroup the ccwgroup device
15 */
16 struct ccwgroup_device {
17 enum {
18 CCWGROUP_OFFLINE,
19 CCWGROUP_ONLINE,
20 } state;
21 /* private: */
22 atomic_t onoff;
23 struct mutex reg_mutex;
24 /* public: */
25 unsigned int count;
26 struct device dev;
27 struct work_struct ungroup_work;
28 struct ccw_device *cdev[];
29 };
30
31 /**
32 * struct ccwgroup_driver - driver for ccw group devices
33 * @setup: function called during device creation to setup the device
34 * @remove: function called on remove
35 * @set_online: function called when device is set online
36 * @set_offline: function called when device is set offline
37 * @shutdown: function called when device is shut down
38 * @driver: embedded driver structure
39 * @ccw_driver: supported ccw_driver (optional)
40 */
41 struct ccwgroup_driver {
42 int (*setup) (struct ccwgroup_device *);
43 void (*remove) (struct ccwgroup_device *);
44 int (*set_online) (struct ccwgroup_device *);
45 int (*set_offline) (struct ccwgroup_device *);
46 void (*shutdown)(struct ccwgroup_device *);
47
48 struct device_driver driver;
49 struct ccw_driver *ccw_driver;
50 };
51
52 extern int ccwgroup_driver_register (struct ccwgroup_driver *cdriver);
53 extern void ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver);
54 int ccwgroup_create_dev(struct device *root, struct ccwgroup_driver *gdrv,
55 int num_devices, const char *buf);
56
57 extern int ccwgroup_set_online(struct ccwgroup_device *gdev);
58 int ccwgroup_set_offline(struct ccwgroup_device *gdev, bool call_gdrv);
59
60 extern int ccwgroup_probe_ccwdev(struct ccw_device *cdev);
61 extern void ccwgroup_remove_ccwdev(struct ccw_device *cdev);
62
63 #define to_ccwgroupdev(x) container_of((x), struct ccwgroup_device, dev)
64 #define to_ccwgroupdrv(x) container_of((x), struct ccwgroup_driver, driver)
65
66 #if IS_ENABLED(CONFIG_CCWGROUP)
67 bool dev_is_ccwgroup(struct device *dev);
68 #else /* CONFIG_CCWGROUP */
69 static inline bool dev_is_ccwgroup(struct device *dev)
70 {
71 return false;
72 }
73 #endif /* CONFIG_CCWGROUP */
74
75 #endif
76
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