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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Mediated device definition
*
* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
* Author: Neo Jia <[email protected]>
* Kirti Wankhede <[email protected]>
*/
#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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