| 1 | /** @file
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| 2 | Driver Binding functions declaration for XenBus Bus driver.
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| 3 |
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| 4 | Copyright (C) 2014, Citrix Ltd.
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| 5 |
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| 6 | SPDX-License-Identifier: BSD-2-Clause-Patent
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| 7 |
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| 8 | **/
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| 9 |
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| 10 | /**
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| 11 | Tests to see if this driver supports a given controller. If a child device is provided,
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| 12 | it further tests to see if this driver supports creating a handle for the specified child device.
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| 13 |
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| 14 | @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
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| 15 | @param[in] ControllerHandle The handle of the controller to test. This handle
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| 16 | must support a protocol interface that supplies
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| 17 | an I/O abstraction to the driver.
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| 18 | @param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This
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| 19 | parameter is ignored by device drivers, and is optional for bus
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| 20 | drivers. For bus drivers, if this parameter is not NULL, then
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| 21 | the bus driver must determine if the bus controller specified
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| 22 | by ControllerHandle and the child controller specified
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| 23 | by RemainingDevicePath are both supported by this
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| 24 | bus driver.
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| 25 |
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| 26 | @retval EFI_SUCCESS The device specified by ControllerHandle and
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| 27 | RemainingDevicePath is supported by the driver specified by This.
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| 28 | @retval EFI_ALREADY_STARTED The device specified by ControllerHandle and
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| 29 | RemainingDevicePath is already being managed by the driver
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| 30 | specified by This.
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| 31 | @retval EFI_ACCESS_DENIED The device specified by ControllerHandle and
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| 32 | RemainingDevicePath is already being managed by a different
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| 33 | driver or an application that requires exclusive access.
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| 34 | Currently not implemented.
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| 35 | @retval EFI_UNSUPPORTED The device specified by ControllerHandle and
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| 36 | RemainingDevicePath is not supported by the driver specified by This.
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| 37 | **/
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| 38 | EFI_STATUS
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| 39 | EFIAPI
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| 40 | XenBusDxeDriverBindingSupported (
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| 41 | IN EFI_DRIVER_BINDING_PROTOCOL *This,
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| 42 | IN EFI_HANDLE ControllerHandle,
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| 43 | IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
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| 44 | );
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| 45 |
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| 46 | /**
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| 47 | Starts a device controller or a bus controller.
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| 48 |
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| 49 | The Start() function is designed to be invoked from the EFI boot service ConnectController().
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| 50 | As a result, much of the error checking on the parameters to Start() has been moved into this
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| 51 | common boot service. It is legal to call Start() from other locations,
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| 52 | but the following calling restrictions must be followed, or the system behavior will not be deterministic.
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| 53 | 1. ControllerHandle must be a valid EFI_HANDLE.
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| 54 | 2. If RemainingDevicePath is not NULL, then it must be a pointer to a naturally aligned
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| 55 | EFI_DEVICE_PATH_PROTOCOL.
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| 56 | 3. Prior to calling Start(), the Supported() function for the driver specified by This must
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| 57 | have been called with the same calling parameters, and Supported() must have returned EFI_SUCCESS.
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| 58 |
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| 59 | @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
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| 60 | @param[in] ControllerHandle The handle of the controller to start. This handle
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| 61 | must support a protocol interface that supplies
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| 62 | an I/O abstraction to the driver.
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| 63 | @param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This
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| 64 | parameter is ignored by device drivers, and is optional for bus
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| 65 | drivers. For a bus driver, if this parameter is NULL, then handles
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| 66 | for all the children of Controller are created by this driver.
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| 67 | If this parameter is not NULL and the first Device Path Node is
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| 68 | not the End of Device Path Node, then only the handle for the
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| 69 | child device specified by the first Device Path Node of
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| 70 | RemainingDevicePath is created by this driver.
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| 71 | If the first Device Path Node of RemainingDevicePath is
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| 72 | the End of Device Path Node, no child handle is created by this
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| 73 | driver.
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| 74 |
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| 75 | @retval EFI_SUCCESS The device was started.
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| 76 | @retval EFI_DEVICE_ERROR The device could not be started due to a device error.Currently not implemented.
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| 77 | @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
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| 78 | @retval Others The driver failded to start the device.
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| 79 |
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| 80 | **/
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| 81 | EFI_STATUS
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| 82 | EFIAPI
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| 83 | XenBusDxeDriverBindingStart (
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| 84 | IN EFI_DRIVER_BINDING_PROTOCOL *This,
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| 85 | IN EFI_HANDLE ControllerHandle,
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| 86 | IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
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| 87 | );
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| 88 |
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| 89 | /**
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| 90 | Stops a device controller or a bus controller.
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| 91 |
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| 92 | The Stop() function is designed to be invoked from the EFI boot service DisconnectController().
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| 93 | As a result, much of the error checking on the parameters to Stop() has been moved
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| 94 | into this common boot service. It is legal to call Stop() from other locations,
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| 95 | but the following calling restrictions must be followed, or the system behavior will not be deterministic.
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| 96 | 1. ControllerHandle must be a valid EFI_HANDLE that was used on a previous call to this
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| 97 | same driver's Start() function.
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| 98 | 2. The first NumberOfChildren handles of ChildHandleBuffer must all be a valid
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| 99 | EFI_HANDLE. In addition, all of these handles must have been created in this driver's
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| 100 | Start() function, and the Start() function must have called OpenProtocol() on
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| 101 | ControllerHandle with an Attribute of EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER.
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| 102 |
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| 103 | @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
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| 104 | @param[in] ControllerHandle A handle to the device being stopped. The handle must
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| 105 | support a bus specific I/O protocol for the driver
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| 106 | to use to stop the device.
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| 107 | @param[in] NumberOfChildren The number of child device handles in ChildHandleBuffer.
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| 108 | @param[in] ChildHandleBuffer An array of child handles to be freed. May be NULL
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| 109 | if NumberOfChildren is 0.
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| 110 |
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| 111 | @retval EFI_SUCCESS The device was stopped.
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| 112 | @retval EFI_DEVICE_ERROR The device could not be stopped due to a device error.
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| 113 |
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| 114 | **/
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| 115 | EFI_STATUS
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| 116 | EFIAPI
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| 117 | XenBusDxeDriverBindingStop (
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| 118 | IN EFI_DRIVER_BINDING_PROTOCOL *This,
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| 119 | IN EFI_HANDLE ControllerHandle,
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| 120 | IN UINTN NumberOfChildren,
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| 121 | IN EFI_HANDLE *ChildHandleBuffer OPTIONAL
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| 122 | );
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