1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * MDEV driver 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 #include <linux/iommu.h> 11 #include <linux/mdev.h> 12 13 #include "mdev_private.h" 14 15 static int mdev_probe(struct device *dev) 16 { 17 struct mdev_driver *drv = 18 container_of(dev->driver, struct mdev_driver, driver); 19 20 if (!drv->probe) 21 return 0; 22 return drv->probe(to_mdev_device(dev)); 23 } 24 25 static void mdev_remove(struct device *dev) 26 { 27 struct mdev_driver *drv = 28 container_of(dev->driver, struct mdev_driver, driver); 29 30 if (drv->remove) 31 drv->remove(to_mdev_device(dev)); 32 } 33 34 static int mdev_match(struct device *dev, struct device_driver *drv) 35 { 36 /* 37 * No drivers automatically match. Drivers are only bound by explicit 38 * device_driver_attach() 39 */ 40 return 0; 41 } 42 43 const struct bus_type mdev_bus_type = { 44 .name = "mdev", 45 .probe = mdev_probe, 46 .remove = mdev_remove, 47 .match = mdev_match, 48 }; 49 50 /** 51 * mdev_register_driver - register a new MDEV driver 52 * @drv: the driver to register 53 * 54 * Returns a negative value on error, otherwise 0. 55 **/ 56 int mdev_register_driver(struct mdev_driver *drv) 57 { 58 if (!drv->device_api) 59 return -EINVAL; 60 61 /* initialize common driver fields */ 62 drv->driver.bus = &mdev_bus_type; 63 return driver_register(&drv->driver); 64 } 65 EXPORT_SYMBOL(mdev_register_driver); 66 67 /* 68 * mdev_unregister_driver - unregister MDEV driver 69 * @drv: the driver to unregister 70 */ 71 void mdev_unregister_driver(struct mdev_driver *drv) 72 { 73 driver_unregister(&drv->driver); 74 } 75 EXPORT_SYMBOL(mdev_unregister_driver); 76