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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef S390_CCWGROUP_H
#define S390_CCWGROUP_H
struct ccw_device;
struct ccw_driver;
/**
* struct ccwgroup_device - ccw group device
* @state: online/offline state
* @count: number of attached slave devices
* @dev: embedded device structure
* @cdev: variable number of slave devices, allocated as needed
* @ungroup_work: work to be done when a ccwgroup notifier has action
* type %BUS_NOTIFY_UNBIND_DRIVER
*/
struct ccwgroup_device {
enum {
CCWGROUP_OFFLINE,
CCWGROUP_ONLINE,
} state;
/* private: */
atomic_t onoff;
struct mutex reg_mutex;
/* public: */
unsigned int count;
struct device dev;
struct work_struct ungroup_work;
struct ccw_device *cdev[0];
};
/**
* struct ccwgroup_driver - driver for ccw group devices
* @setup: function called during device creation to setup the device
* @remove: function called on remove
* @set_online: function called when device is set online
* @set_offline: function called when device is set offline
* @shutdown: function called when device is shut down
* @prepare: prepare for pm state transition
* @complete: undo work done in @prepare
* @freeze: callback for freezing during hibernation snapshotting
* @thaw: undo work done in @freeze
* @restore: callback for restoring after hibernation
* @driver: embedded driver structure
* @ccw_driver: supported ccw_driver (optional)
*/
struct ccwgroup_driver {
int (*setup) (struct ccwgroup_device *);
void (*remove) (struct ccwgroup_device *);
int (*set_online) (struct ccwgroup_device *);
int (*set_offline) (struct ccwgroup_device *);
void (*shutdown)(struct ccwgroup_device *);
int (*prepare) (struct ccwgroup_device *);
void (*complete) (struct ccwgroup_device *);
int (*freeze)(struct ccwgroup_device *);
int (*thaw) (struct ccwgroup_device *);
int (*restore)(struct ccwgroup_device *);
struct device_driver driver;
struct ccw_driver *ccw_driver;
};
extern int ccwgroup_driver_register (struct ccwgroup_driver *cdriver);
extern void ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver);
int ccwgroup_create_dev(struct device *root, struct ccwgroup_driver *gdrv,
int num_devices, const char *buf);
struct ccwgroup_device *get_ccwgroupdev_by_busid(struct ccwgroup_driver *gdrv,
char *bus_id);
extern int ccwgroup_set_online(struct ccwgroup_device *gdev);
extern int ccwgroup_set_offline(struct ccwgroup_device *gdev);
extern int ccwgroup_probe_ccwdev(struct ccw_device *cdev);
extern void ccwgroup_remove_ccwdev(struct ccw_device *cdev);
#define to_ccwgroupdev(x) container_of((x), struct ccwgroup_device, dev)
#define to_ccwgroupdrv(x) container_of((x), struct ccwgroup_driver, driver)
#if IS_ENABLED(CONFIG_CCWGROUP)
bool dev_is_ccwgroup(struct device *dev);
#else /* CONFIG_CCWGROUP */
static inline bool dev_is_ccwgroup(struct device *dev)
{
return false;
}
#endif /* CONFIG_CCWGROUP */
#endif
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