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 * @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 * @ccw_driver: supported ccw_driver (optional) 46 */ 47 struct ccwgroup_driver { 48 int (*setup) (struct ccwgroup_device *); 49 void (*remove) (struct ccwgroup_device *); 50 int (*set_online) (struct ccwgroup_device *); 51 int (*set_offline) (struct ccwgroup_device *); 52 void (*shutdown)(struct ccwgroup_device *); 53 int (*prepare) (struct ccwgroup_device *); 54 void (*complete) (struct ccwgroup_device *); 55 int (*freeze)(struct ccwgroup_device *); 56 int (*thaw) (struct ccwgroup_device *); 57 int (*restore)(struct ccwgroup_device *); 58 59 struct device_driver driver; 60 struct ccw_driver *ccw_driver; 61 }; 62 63 extern int ccwgroup_driver_register (struct ccwgroup_driver *cdriver); 64 extern void ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver); 65 int ccwgroup_create_dev(struct device *root, struct ccwgroup_driver *gdrv, 66 int num_devices, const char *buf); 67 68 extern int ccwgroup_set_online(struct ccwgroup_device *gdev); 69 extern int ccwgroup_set_offline(struct ccwgroup_device *gdev); 70 71 extern int ccwgroup_probe_ccwdev(struct ccw_device *cdev); 72 extern void ccwgroup_remove_ccwdev(struct ccw_device *cdev); 73 74 #define to_ccwgroupdev(x) container_of((x), struct ccwgroup_device, dev) 75 #define to_ccwgroupdrv(x) container_of((x), struct ccwgroup_driver, driver) 76 #endif 77