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usr
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src
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linux-headers-6.8.0-83
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include
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linux
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drwxr-xr-x
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mdev.h
/* SPDX-License-Identifier: GPL-2.0-only */ /* * Mediated device definition * * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. * Author: Neo Jia <cjia@nvidia.com> * Kirti Wankhede <kwankhede@nvidia.com> */ #ifndef MDEV_H #define MDEV_H #include <linux/device.h> #include <linux/uuid.h> struct mdev_type; struct mdev_device { struct device dev; guid_t uuid; struct list_head next; struct mdev_type *type; bool active; }; struct mdev_type { /* set by the driver before calling mdev_register parent: */ const char *sysfs_name; const char *pretty_name; /* set by the core, can be used drivers */ struct mdev_parent *parent; /* internal only */ struct kobject kobj; struct kobject *devices_kobj; }; /* embedded into the struct device that the mdev devices hang off */ struct mdev_parent { struct device *dev; struct mdev_driver *mdev_driver; struct kset *mdev_types_kset; /* Synchronize device creation/removal with parent unregistration */ struct rw_semaphore unreg_sem; struct mdev_type **types; unsigned int nr_types; atomic_t available_instances; }; static inline struct mdev_device *to_mdev_device(struct device *dev) { return container_of(dev, struct mdev_device, dev); } /** * struct mdev_driver - Mediated device driver * @device_api: string to return for the device_api sysfs * @max_instances: maximum number of instances supported (optional) * @probe: called when new device created * @remove: called when device removed * @get_available: Return the max number of instances that can be created * @show_description: Print a description of the mtype * @driver: device driver structure **/ struct mdev_driver { const char *device_api; unsigned int max_instances; int (*probe)(struct mdev_device *dev); void (*remove)(struct mdev_device *dev); unsigned int (*get_available)(struct mdev_type *mtype); ssize_t (*show_description)(struct mdev_type *mtype, char *buf); struct device_driver driver; }; int mdev_register_parent(struct mdev_parent *parent, struct device *dev, struct mdev_driver *mdev_driver, struct mdev_type **types, unsigned int nr_types); void mdev_unregister_parent(struct mdev_parent *parent); int mdev_register_driver(struct mdev_driver *drv); void mdev_unregister_driver(struct mdev_driver *drv); static inline struct device *mdev_dev(struct mdev_device *mdev) { return &mdev->dev; } #endif /* MDEV_H */
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