1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Mediated device definition 4 * 5 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. 6 * Author: Neo Jia <cjia@nvidia.com> 7 * Kirti Wankhede <kwankhede@nvidia.com> 8 */ 9 10 #ifndef MDEV_H 11 #define MDEV_H 12 13 struct mdev_type; 14 15 struct mdev_device { 16 struct device dev; 17 guid_t uuid; 18 struct list_head next; 19 struct mdev_type *type; 20 bool active; 21 }; 22 23 static inline struct mdev_device *to_mdev_device(struct device *dev) 24 { 25 return container_of(dev, struct mdev_device, dev); 26 } 27 28 unsigned int mdev_get_type_group_id(struct mdev_device *mdev); 29 unsigned int mtype_get_type_group_id(struct mdev_type *mtype); 30 struct device *mtype_get_parent_dev(struct mdev_type *mtype); 31 32 /* interface for exporting mdev supported type attributes */ 33 struct mdev_type_attribute { 34 struct attribute attr; 35 ssize_t (*show)(struct mdev_type *mtype, 36 struct mdev_type_attribute *attr, char *buf); 37 ssize_t (*store)(struct mdev_type *mtype, 38 struct mdev_type_attribute *attr, const char *buf, 39 size_t count); 40 }; 41 42 #define MDEV_TYPE_ATTR(_name, _mode, _show, _store) \ 43 struct mdev_type_attribute mdev_type_attr_##_name = \ 44 __ATTR(_name, _mode, _show, _store) 45 #define MDEV_TYPE_ATTR_RW(_name) \ 46 struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RW(_name) 47 #define MDEV_TYPE_ATTR_RO(_name) \ 48 struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RO(_name) 49 #define MDEV_TYPE_ATTR_WO(_name) \ 50 struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_WO(_name) 51 52 /** 53 * struct mdev_driver - Mediated device driver 54 * @probe: called when new device created 55 * @remove: called when device removed 56 * @supported_type_groups: Attributes to define supported types. It is mandatory 57 * to provide supported types. 58 * @driver: device driver structure 59 * 60 **/ 61 struct mdev_driver { 62 int (*probe)(struct mdev_device *dev); 63 void (*remove)(struct mdev_device *dev); 64 struct attribute_group **supported_type_groups; 65 struct device_driver driver; 66 }; 67 68 extern struct bus_type mdev_bus_type; 69 70 int mdev_register_device(struct device *dev, struct mdev_driver *mdev_driver); 71 void mdev_unregister_device(struct device *dev); 72 73 int mdev_register_driver(struct mdev_driver *drv); 74 void mdev_unregister_driver(struct mdev_driver *drv); 75 76 struct device *mdev_parent_dev(struct mdev_device *mdev); 77 static inline struct device *mdev_dev(struct mdev_device *mdev) 78 { 79 return &mdev->dev; 80 } 81 static inline struct mdev_device *mdev_from_dev(struct device *dev) 82 { 83 return dev->bus == &mdev_bus_type ? to_mdev_device(dev) : NULL; 84 } 85 86 #endif /* MDEV_H */ 87