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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/s390/include/asm/ccwgroup.h
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/* SPDX-License-Identifier: GPL-2.0 */

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#ifndef S390_CCWGROUP_H

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#define S390_CCWGROUP_H

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struct ccw_device;

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struct ccw_driver;

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/**

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 * struct ccwgroup_device - ccw group device

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 * @state: online/offline state

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 * @count: number of attached slave devices

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 * @dev: embedded device structure

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 * @cdev: variable number of slave devices, allocated as needed

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 * @ungroup_work: used to ungroup the ccwgroup device

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 */

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struct ccwgroup_device {

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	enum {

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		CCWGROUP_OFFLINE,

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		CCWGROUP_ONLINE,

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	} state;

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/* private: */

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	atomic_t onoff;

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	struct mutex reg_mutex;

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/* public: */

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	unsigned int count;

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	struct device	dev;

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	struct work_struct ungroup_work;

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	struct ccw_device *cdev[];

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};

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/**

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 * struct ccwgroup_driver - driver for ccw group devices

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 * @setup: function called during device creation to setup the device

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 * @remove: function called on remove

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 * @set_online: function called when device is set online

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 * @set_offline: function called when device is set offline

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 * @shutdown: function called when device is shut down

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 * @driver: embedded driver structure

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 * @ccw_driver: supported ccw_driver (optional)

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 */

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struct ccwgroup_driver {

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	int (*setup) (struct ccwgroup_device *);

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	void (*remove) (struct ccwgroup_device *);

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	int (*set_online) (struct ccwgroup_device *);

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	int (*set_offline) (struct ccwgroup_device *);

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	void (*shutdown)(struct ccwgroup_device *);

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	struct device_driver driver;

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	struct ccw_driver *ccw_driver;

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};

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extern int  ccwgroup_driver_register   (struct ccwgroup_driver *cdriver);

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extern void ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver);

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int ccwgroup_create_dev(struct device *root, struct ccwgroup_driver *gdrv,

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			int num_devices, const char *buf);

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extern int ccwgroup_set_online(struct ccwgroup_device *gdev);

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int ccwgroup_set_offline(struct ccwgroup_device *gdev, bool call_gdrv);

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extern int ccwgroup_probe_ccwdev(struct ccw_device *cdev);

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extern void ccwgroup_remove_ccwdev(struct ccw_device *cdev);

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#define to_ccwgroupdev(x) container_of((x), struct ccwgroup_device, dev)

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#define to_ccwgroupdrv(x) container_of((x), struct ccwgroup_driver, driver)

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#if IS_ENABLED(CONFIG_CCWGROUP)

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bool dev_is_ccwgroup(struct device *dev);

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#else /* CONFIG_CCWGROUP */

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static inline bool dev_is_ccwgroup(struct device *dev)

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{

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	return false;

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}

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#endif /* CONFIG_CCWGROUP */

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#endif

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