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[0]; 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