xref: /linux/arch/s390/include/asm/ccwgroup.h (revision 60e13231561b3a4c5269bfa1ef6c0569ad6f28ec)
1 #ifndef S390_CCWGROUP_H
2 #define S390_CCWGROUP_H
3 
4 struct ccw_device;
5 struct ccw_driver;
6 
7 /**
8  * struct ccwgroup_device - ccw group device
9  * @creator_id: unique number of the driver
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  */
15 struct ccwgroup_device {
16 	unsigned long creator_id;
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 ccw_device *cdev[0];
28 };
29 
30 /**
31  * struct ccwgroup_driver - driver for ccw group devices
32  * @max_slaves: maximum number of slave devices
33  * @driver_id: unique id
34  * @probe: function called on probe
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  * @prepare: prepare for pm state transition
40  * @complete: undo work done in @prepare
41  * @freeze: callback for freezing during hibernation snapshotting
42  * @thaw: undo work done in @freeze
43  * @restore: callback for restoring after hibernation
44  * @driver: embedded driver structure
45  */
46 struct ccwgroup_driver {
47 	int max_slaves;
48 	unsigned long driver_id;
49 
50 	int (*probe) (struct ccwgroup_device *);
51 	void (*remove) (struct ccwgroup_device *);
52 	int (*set_online) (struct ccwgroup_device *);
53 	int (*set_offline) (struct ccwgroup_device *);
54 	void (*shutdown)(struct ccwgroup_device *);
55 	int (*prepare) (struct ccwgroup_device *);
56 	void (*complete) (struct ccwgroup_device *);
57 	int (*freeze)(struct ccwgroup_device *);
58 	int (*thaw) (struct ccwgroup_device *);
59 	int (*restore)(struct ccwgroup_device *);
60 
61 	struct device_driver driver;
62 };
63 
64 extern int  ccwgroup_driver_register   (struct ccwgroup_driver *cdriver);
65 extern void ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver);
66 int ccwgroup_create_from_string(struct device *root, unsigned int creator_id,
67 				struct ccw_driver *cdrv, int num_devices,
68 				const char *buf);
69 
70 extern int ccwgroup_probe_ccwdev(struct ccw_device *cdev);
71 extern void ccwgroup_remove_ccwdev(struct ccw_device *cdev);
72 
73 #define to_ccwgroupdev(x) container_of((x), struct ccwgroup_device, dev)
74 #define to_ccwgroupdrv(x) container_of((x), struct ccwgroup_driver, driver)
75 #endif
76