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 */ 72 static inline bool dev_is_ccwgroup(struct device *dev) 73 { 74 return false; 75 } 76 #endif /* CONFIG_CCWGROUP */ 77 78 #endif 79