arch/s390/include/asm/ccwgroup.h

   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 struct ccwgroup_device *get_ccwgroupdev_by_busid(struct ccwgroup_driver *gdrv,
  68                                                  char *bus_id);
  69
  70 extern int ccwgroup_set_online(struct ccwgroup_device *gdev);
  71 extern int ccwgroup_set_offline(struct ccwgroup_device *gdev);
  72
  73 extern int ccwgroup_probe_ccwdev(struct ccw_device *cdev);
  74 extern void ccwgroup_remove_ccwdev(struct ccw_device *cdev);
  75
  76 #define to_ccwgroupdev(x) container_of((x), struct ccwgroup_device, dev)
  77 #define to_ccwgroupdrv(x) container_of((x), struct ccwgroup_driver, driver)
  78
  79 #if IS_ENABLED(CONFIG_CCWGROUP)
  80 bool dev_is_ccwgroup(struct device *dev);
  81 #else /* CONFIG_CCWGROUP */
  82 static inline bool dev_is_ccwgroup(struct device *dev)
  83 {
  84         return false;
  85 }
  86 #endif /* CONFIG_CCWGROUP */
  87
  88 #endif