1d956501fe
Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com> Reviewed-by: Jie Lin <jie.lin@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17368 6f19259b-4bc3-4df7-8a09-765794883524
1229 lines
44 KiB
C
1229 lines
44 KiB
C
/** @file
|
|
This file implements I2C Host Protocol which provides callers with the ability to
|
|
do I/O transactions to all of the devices on the I2C bus.
|
|
|
|
Copyright (c) 2014, Hewlett-Packard Development Company, L.P.<BR>
|
|
Copyright (c) 2013 - 2015, Intel Corporation. All rights reserved.<BR>
|
|
This program and the accompanying materials
|
|
are licensed and made available under the terms and conditions of the BSD License
|
|
which accompanies this distribution. The full text of the license may be found at
|
|
http://opensource.org/licenses/bsd-license.php
|
|
|
|
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
|
|
|
**/
|
|
|
|
#include "I2cDxe.h"
|
|
|
|
EFI_DRIVER_BINDING_PROTOCOL gI2cHostDriverBinding = {
|
|
I2cHostDriverSupported,
|
|
I2cHostDriverStart,
|
|
I2cHostDriverStop,
|
|
0x10,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
//
|
|
// Driver name table
|
|
//
|
|
GLOBAL_REMOVE_IF_UNREFERENCED EFI_UNICODE_STRING_TABLE mI2cHostDriverNameTable[] = {
|
|
{ "eng;en", L"I2c Host Driver" },
|
|
{ NULL , NULL }
|
|
};
|
|
|
|
//
|
|
// EFI Component Name Protocol
|
|
//
|
|
GLOBAL_REMOVE_IF_UNREFERENCED EFI_COMPONENT_NAME_PROTOCOL gI2cHostComponentName = {
|
|
(EFI_COMPONENT_NAME_GET_DRIVER_NAME) I2cHostComponentNameGetDriverName,
|
|
(EFI_COMPONENT_NAME_GET_CONTROLLER_NAME) I2cHostComponentNameGetControllerName,
|
|
"eng"
|
|
};
|
|
|
|
//
|
|
// EFI Component Name 2 Protocol
|
|
//
|
|
GLOBAL_REMOVE_IF_UNREFERENCED EFI_COMPONENT_NAME2_PROTOCOL gI2cHostComponentName2 = {
|
|
I2cHostComponentNameGetDriverName,
|
|
I2cHostComponentNameGetControllerName,
|
|
"en"
|
|
};
|
|
|
|
/**
|
|
Retrieves a Unicode string that is the user readable name of the driver.
|
|
|
|
This function retrieves the user readable name of a driver in the form of a
|
|
Unicode string. If the driver specified by This has a user readable name in
|
|
the language specified by Language, then a pointer to the driver name is
|
|
returned in DriverName, and EFI_SUCCESS is returned. If the driver specified
|
|
by This does not support the language specified by Language,
|
|
then EFI_UNSUPPORTED is returned.
|
|
|
|
@param This[in] A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or
|
|
EFI_COMPONENT_NAME_PROTOCOL instance.
|
|
|
|
@param Language[in] A pointer to a Null-terminated ASCII string
|
|
array indicating the language. This is the
|
|
language of the driver name that the caller is
|
|
requesting, and it must match one of the
|
|
languages specified in SupportedLanguages. The
|
|
number of languages supported by a driver is up
|
|
to the driver writer. Language is specified
|
|
in RFC 4646 or ISO 639-2 language code format.
|
|
|
|
@param DriverName[out] A pointer to the Unicode string to return.
|
|
This Unicode string is the name of the
|
|
driver specified by This in the language
|
|
specified by Language.
|
|
|
|
@retval EFI_SUCCESS The Unicode string for the Driver specified by
|
|
This and the language specified by Language was
|
|
returned in DriverName.
|
|
|
|
@retval EFI_INVALID_PARAMETER Language is NULL.
|
|
|
|
@retval EFI_INVALID_PARAMETER DriverName is NULL.
|
|
|
|
@retval EFI_UNSUPPORTED The driver specified by This does not support
|
|
the language specified by Language.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
I2cHostComponentNameGetDriverName (
|
|
IN EFI_COMPONENT_NAME2_PROTOCOL *This,
|
|
IN CHAR8 *Language,
|
|
OUT CHAR16 **DriverName
|
|
)
|
|
{
|
|
return LookupUnicodeString2 (
|
|
Language,
|
|
This->SupportedLanguages,
|
|
mI2cHostDriverNameTable,
|
|
DriverName,
|
|
(BOOLEAN)(This != &gI2cHostComponentName2)
|
|
);
|
|
}
|
|
|
|
/**
|
|
Retrieves a Unicode string that is the user readable name of the controller
|
|
that is being managed by a driver.
|
|
|
|
This function retrieves the user readable name of the controller specified by
|
|
ControllerHandle and ChildHandle in the form of a Unicode string. If the
|
|
driver specified by This has a user readable name in the language specified by
|
|
Language, then a pointer to the controller name is returned in ControllerName,
|
|
and EFI_SUCCESS is returned. If the driver specified by This is not currently
|
|
managing the controller specified by ControllerHandle and ChildHandle,
|
|
then EFI_UNSUPPORTED is returned. If the driver specified by This does not
|
|
support the language specified by Language, then EFI_UNSUPPORTED is returned.
|
|
|
|
@param This[in] A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or
|
|
EFI_COMPONENT_NAME_PROTOCOL instance.
|
|
|
|
@param ControllerHandle[in] The handle of a controller that the driver
|
|
specified by This is managing. This handle
|
|
specifies the controller whose name is to be
|
|
returned.
|
|
|
|
@param ChildHandle[in] The handle of the child controller to retrieve
|
|
the name of. This is an optional parameter that
|
|
may be NULL. It will be NULL for device
|
|
drivers. It will also be NULL for a bus drivers
|
|
that wish to retrieve the name of the bus
|
|
controller. It will not be NULL for a bus
|
|
driver that wishes to retrieve the name of a
|
|
child controller.
|
|
|
|
@param Language[in] A pointer to a Null-terminated ASCII string
|
|
array indicating the language. This is the
|
|
language of the driver name that the caller is
|
|
requesting, and it must match one of the
|
|
languages specified in SupportedLanguages. The
|
|
number of languages supported by a driver is up
|
|
to the driver writer. Language is specified in
|
|
RFC 4646 or ISO 639-2 language code format.
|
|
|
|
@param ControllerName[out] A pointer to the Unicode string to return.
|
|
This Unicode string is the name of the
|
|
controller specified by ControllerHandle and
|
|
ChildHandle in the language specified by
|
|
Language from the point of view of the driver
|
|
specified by This.
|
|
|
|
@retval EFI_SUCCESS The Unicode string for the user readable name in
|
|
the language specified by Language for the
|
|
driver specified by This was returned in
|
|
DriverName.
|
|
|
|
@retval EFI_INVALID_PARAMETER ControllerHandle is NULL.
|
|
|
|
@retval EFI_INVALID_PARAMETER ChildHandle is not NULL and it is not a valid
|
|
EFI_HANDLE.
|
|
|
|
@retval EFI_INVALID_PARAMETER Language is NULL.
|
|
|
|
@retval EFI_INVALID_PARAMETER ControllerName is NULL.
|
|
|
|
@retval EFI_UNSUPPORTED The driver specified by This is not currently
|
|
managing the controller specified by
|
|
ControllerHandle and ChildHandle.
|
|
|
|
@retval EFI_UNSUPPORTED The driver specified by This does not support
|
|
the language specified by Language.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
I2cHostComponentNameGetControllerName (
|
|
IN EFI_COMPONENT_NAME2_PROTOCOL *This,
|
|
IN EFI_HANDLE ControllerHandle,
|
|
IN EFI_HANDLE ChildHandle OPTIONAL,
|
|
IN CHAR8 *Language,
|
|
OUT CHAR16 **ControllerName
|
|
)
|
|
{
|
|
return EFI_UNSUPPORTED;
|
|
}
|
|
|
|
/**
|
|
Tests to see if this driver supports a given controller. If a child device is provided,
|
|
it further tests to see if this driver supports creating a handle for the specified child device.
|
|
|
|
This function checks to see if the driver specified by This supports the device specified by
|
|
ControllerHandle. Drivers will typically use the device path attached to
|
|
ControllerHandle and/or the services from the bus I/O abstraction attached to
|
|
ControllerHandle to determine if the driver supports ControllerHandle. This function
|
|
may be called many times during platform initialization. In order to reduce boot times, the tests
|
|
performed by this function must be very small, and take as little time as possible to execute. This
|
|
function must not change the state of any hardware devices, and this function must be aware that the
|
|
device specified by ControllerHandle may already be managed by the same driver or a
|
|
different driver. This function must match its calls to AllocatePages() with FreePages(),
|
|
AllocatePool() with FreePool(), and OpenProtocol() with CloseProtocol().
|
|
Since ControllerHandle may have been previously started by the same driver, if a protocol is
|
|
already in the opened state, then it must not be closed with CloseProtocol(). This is required
|
|
to guarantee the state of ControllerHandle is not modified by this function.
|
|
|
|
@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
|
|
@param[in] ControllerHandle The handle of the controller to test. This handle
|
|
must support a protocol interface that supplies
|
|
an I/O abstraction to the driver.
|
|
@param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This
|
|
parameter is ignored by device drivers, and is optional for bus
|
|
drivers. For bus drivers, if this parameter is not NULL, then
|
|
the bus driver must determine if the bus controller specified
|
|
by ControllerHandle and the child controller specified
|
|
by RemainingDevicePath are both supported by this
|
|
bus driver.
|
|
|
|
@retval EFI_SUCCESS The device specified by ControllerHandle and
|
|
RemainingDevicePath is supported by the driver specified by This.
|
|
@retval EFI_ALREADY_STARTED The device specified by ControllerHandle and
|
|
RemainingDevicePath is already being managed by the driver
|
|
specified by This.
|
|
@retval EFI_ACCESS_DENIED The device specified by ControllerHandle and
|
|
RemainingDevicePath is already being managed by a different
|
|
driver or an application that requires exclusive access.
|
|
Currently not implemented.
|
|
@retval EFI_UNSUPPORTED The device specified by ControllerHandle and
|
|
RemainingDevicePath is not supported by the driver specified by This.
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
I2cHostDriverSupported (
|
|
IN EFI_DRIVER_BINDING_PROTOCOL *This,
|
|
IN EFI_HANDLE Controller,
|
|
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
|
|
)
|
|
{
|
|
EFI_I2C_MASTER_PROTOCOL *I2cMaster;
|
|
EFI_I2C_BUS_CONFIGURATION_MANAGEMENT_PROTOCOL *I2cBusConfigurationManagement;
|
|
EFI_STATUS Status;
|
|
|
|
//
|
|
// Locate I2C Bus Configuration Management Protocol
|
|
//
|
|
Status = gBS->OpenProtocol (
|
|
Controller,
|
|
&gEfiI2cBusConfigurationManagementProtocolGuid,
|
|
(VOID **)&I2cBusConfigurationManagement,
|
|
This->DriverBindingHandle,
|
|
Controller,
|
|
EFI_OPEN_PROTOCOL_BY_DRIVER
|
|
);
|
|
if (EFI_ERROR (Status)) {
|
|
return Status;
|
|
}
|
|
|
|
//
|
|
// Close the protocol because we don't use it here
|
|
//
|
|
gBS->CloseProtocol (
|
|
Controller,
|
|
&gEfiI2cBusConfigurationManagementProtocolGuid,
|
|
This->DriverBindingHandle,
|
|
Controller
|
|
);
|
|
|
|
//
|
|
// Locate I2C Master Protocol
|
|
//
|
|
Status = gBS->OpenProtocol (
|
|
Controller,
|
|
&gEfiI2cMasterProtocolGuid,
|
|
(VOID **)&I2cMaster,
|
|
This->DriverBindingHandle,
|
|
Controller,
|
|
EFI_OPEN_PROTOCOL_GET_PROTOCOL
|
|
);
|
|
if (EFI_ERROR (Status)) {
|
|
return Status;
|
|
}
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
Starts a device controller or a bus controller.
|
|
|
|
The Start() function is designed to be invoked from the EFI boot service ConnectController().
|
|
As a result, much of the error checking on the parameters to Start() has been moved into this
|
|
common boot service. It is legal to call Start() from other locations,
|
|
but the following calling restrictions must be followed, or the system behavior will not be deterministic.
|
|
1. ControllerHandle must be a valid EFI_HANDLE.
|
|
2. If RemainingDevicePath is not NULL, then it must be a pointer to a naturally aligned
|
|
EFI_DEVICE_PATH_PROTOCOL.
|
|
3. Prior to calling Start(), the Supported() function for the driver specified by This must
|
|
have been called with the same calling parameters, and Supported() must have returned EFI_SUCCESS.
|
|
|
|
@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
|
|
@param[in] ControllerHandle The handle of the controller to start. This handle
|
|
must support a protocol interface that supplies
|
|
an I/O abstraction to the driver.
|
|
@param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This
|
|
parameter is ignored by device drivers, and is optional for bus
|
|
drivers. For a bus driver, if this parameter is NULL, then handles
|
|
for all the children of Controller are created by this driver.
|
|
If this parameter is not NULL and the first Device Path Node is
|
|
not the End of Device Path Node, then only the handle for the
|
|
child device specified by the first Device Path Node of
|
|
RemainingDevicePath is created by this driver.
|
|
If the first Device Path Node of RemainingDevicePath is
|
|
the End of Device Path Node, no child handle is created by this
|
|
driver.
|
|
|
|
@retval EFI_SUCCESS The device was started.
|
|
@retval EFI_DEVICE_ERROR The device could not be started due to a device error.Currently not implemented.
|
|
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
|
|
@retval Others The driver failded to start the device.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
I2cHostDriverStart (
|
|
IN EFI_DRIVER_BINDING_PROTOCOL *This,
|
|
IN EFI_HANDLE Controller,
|
|
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
EFI_I2C_MASTER_PROTOCOL *I2cMaster;
|
|
EFI_I2C_BUS_CONFIGURATION_MANAGEMENT_PROTOCOL *I2cBusConfigurationManagement;
|
|
I2C_HOST_CONTEXT *I2cHostContext;
|
|
|
|
I2cMaster = NULL;
|
|
I2cHostContext = NULL;
|
|
I2cBusConfigurationManagement = NULL;
|
|
|
|
//
|
|
// Locate I2C Bus Configuration Management Protocol
|
|
//
|
|
Status = gBS->OpenProtocol (
|
|
Controller,
|
|
&gEfiI2cBusConfigurationManagementProtocolGuid,
|
|
(VOID **)&I2cBusConfigurationManagement,
|
|
This->DriverBindingHandle,
|
|
Controller,
|
|
EFI_OPEN_PROTOCOL_BY_DRIVER
|
|
);
|
|
if (EFI_ERROR (Status)) {
|
|
DEBUG ((EFI_D_ERROR, "I2cHost: Open I2C bus configuration error, Status = %r\n", Status));
|
|
return Status;
|
|
}
|
|
|
|
//
|
|
// Locate I2C Master Protocol
|
|
//
|
|
Status = gBS->OpenProtocol (
|
|
Controller,
|
|
&gEfiI2cMasterProtocolGuid,
|
|
(VOID **)&I2cMaster,
|
|
This->DriverBindingHandle,
|
|
Controller,
|
|
EFI_OPEN_PROTOCOL_GET_PROTOCOL
|
|
);
|
|
if (EFI_ERROR (Status)) {
|
|
DEBUG ((EFI_D_ERROR, "I2cHost: Open I2C master error, Status = %r\n", Status));
|
|
goto Exit;
|
|
}
|
|
|
|
//
|
|
// Allocate the I2C Host Context structure
|
|
//
|
|
I2cHostContext = AllocateZeroPool (sizeof (I2C_HOST_CONTEXT));
|
|
if (I2cHostContext == NULL) {
|
|
DEBUG ((EFI_D_ERROR, "I2cHost: there is no enough memory to allocate.\n"));
|
|
Status = EFI_OUT_OF_RESOURCES;
|
|
goto Exit;
|
|
}
|
|
|
|
//
|
|
// Initialize the context structure for the current I2C Controller
|
|
//
|
|
I2cHostContext->Signature = I2C_HOST_SIGNATURE;
|
|
I2cHostContext->I2cMaster = I2cMaster;
|
|
I2cHostContext->I2cBusConfigurationManagement = I2cBusConfigurationManagement;
|
|
I2cHostContext->I2cBusConfiguration = (UINTN) -1;
|
|
InitializeListHead(&I2cHostContext->RequestList);
|
|
|
|
//
|
|
// Reset the controller
|
|
//
|
|
Status = I2cMaster->Reset (I2cMaster);
|
|
if (EFI_ERROR (Status)) {
|
|
DEBUG ((EFI_D_ERROR, "I2cHost: I2C controller reset failed!\n"));
|
|
goto Exit;
|
|
}
|
|
|
|
//
|
|
// Create the I2C transaction complete event
|
|
//
|
|
Status = gBS->CreateEvent (
|
|
EVT_NOTIFY_SIGNAL,
|
|
TPL_I2C_SYNC,
|
|
I2cHostRequestCompleteEvent,
|
|
I2cHostContext,
|
|
&I2cHostContext->I2cEvent
|
|
);
|
|
if (EFI_ERROR (Status)) {
|
|
DEBUG ((EFI_D_ERROR, "I2cHost: create complete event error, Status = %r\n", Status));
|
|
goto Exit;
|
|
}
|
|
|
|
//
|
|
// Get the bus management event
|
|
//
|
|
Status = gBS->CreateEvent (
|
|
EVT_NOTIFY_SIGNAL,
|
|
TPL_I2C_SYNC,
|
|
I2cHostI2cBusConfigurationAvailable,
|
|
I2cHostContext,
|
|
&I2cHostContext->I2cBusConfigurationEvent
|
|
);
|
|
if (EFI_ERROR (Status)) {
|
|
DEBUG ((EFI_D_ERROR, "I2cHost: create bus available event error, Status = %r\n", Status));
|
|
goto Exit;
|
|
}
|
|
|
|
//
|
|
// Build the I2C host protocol for the current I2C controller
|
|
//
|
|
I2cHostContext->I2cHost.QueueRequest = I2cHostQueueRequest;
|
|
I2cHostContext->I2cHost.I2cControllerCapabilities = I2cMaster->I2cControllerCapabilities;
|
|
|
|
//
|
|
// Install the driver protocol
|
|
//
|
|
Status = gBS->InstallMultipleProtocolInterfaces (
|
|
&Controller,
|
|
&gEfiI2cHostProtocolGuid,
|
|
&I2cHostContext->I2cHost,
|
|
NULL
|
|
);
|
|
Exit:
|
|
if (EFI_ERROR (Status)) {
|
|
DEBUG ((EFI_D_ERROR, "I2cHost: Start() function failed, Status = %r\n", Status));
|
|
if (I2cBusConfigurationManagement != NULL) {
|
|
gBS->CloseProtocol (
|
|
Controller,
|
|
&gEfiI2cBusConfigurationManagementProtocolGuid,
|
|
This->DriverBindingHandle,
|
|
Controller
|
|
);
|
|
}
|
|
|
|
if ((I2cHostContext != NULL) && (I2cHostContext->I2cEvent != NULL)) {
|
|
gBS->CloseEvent (I2cHostContext->I2cEvent);
|
|
I2cHostContext->I2cEvent = NULL;
|
|
}
|
|
|
|
if ((I2cHostContext != NULL) && (I2cHostContext->I2cBusConfigurationEvent != NULL)) {
|
|
gBS->CloseEvent (I2cHostContext->I2cBusConfigurationEvent);
|
|
I2cHostContext->I2cBusConfigurationEvent = NULL;
|
|
}
|
|
|
|
//
|
|
// Release the context structure upon failure
|
|
//
|
|
if (I2cHostContext != NULL) {
|
|
FreePool (I2cHostContext);
|
|
}
|
|
}
|
|
|
|
//
|
|
// Return the operation status.
|
|
//
|
|
return Status;
|
|
}
|
|
|
|
/**
|
|
Stops a device controller or a bus controller.
|
|
|
|
The Stop() function is designed to be invoked from the EFI boot service DisconnectController().
|
|
As a result, much of the error checking on the parameters to Stop() has been moved
|
|
into this common boot service. It is legal to call Stop() from other locations,
|
|
but the following calling restrictions must be followed, or the system behavior will not be deterministic.
|
|
1. ControllerHandle must be a valid EFI_HANDLE that was used on a previous call to this
|
|
same driver's Start() function.
|
|
2. The first NumberOfChildren handles of ChildHandleBuffer must all be a valid
|
|
EFI_HANDLE. In addition, all of these handles must have been created in this driver's
|
|
Start() function, and the Start() function must have called OpenProtocol() on
|
|
ControllerHandle with an Attribute of EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER.
|
|
|
|
@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
|
|
@param[in] ControllerHandle A handle to the device being stopped. The handle must
|
|
support a bus specific I/O protocol for the driver
|
|
to use to stop the device.
|
|
@param[in] NumberOfChildren The number of child device handles in ChildHandleBuffer.
|
|
@param[in] ChildHandleBuffer An array of child handles to be freed. May be NULL
|
|
if NumberOfChildren is 0.
|
|
|
|
@retval EFI_SUCCESS The device was stopped.
|
|
@retval EFI_DEVICE_ERROR The device could not be stopped due to a device error.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
I2cHostDriverStop (
|
|
IN EFI_DRIVER_BINDING_PROTOCOL *This,
|
|
IN EFI_HANDLE Controller,
|
|
IN UINTN NumberOfChildren,
|
|
IN EFI_HANDLE *ChildHandleBuffer
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
I2C_HOST_CONTEXT *I2cHostContext;
|
|
EFI_I2C_HOST_PROTOCOL *I2cHost;
|
|
EFI_TPL TplPrevious;
|
|
|
|
TplPrevious = EfiGetCurrentTpl ();
|
|
if (TplPrevious > TPL_I2C_SYNC) {
|
|
DEBUG ((EFI_D_ERROR, "I2cHost: TPL %d is too high in Stop.\n", TplPrevious));
|
|
return EFI_DEVICE_ERROR;
|
|
}
|
|
|
|
Status = gBS->OpenProtocol (
|
|
Controller,
|
|
&gEfiI2cHostProtocolGuid,
|
|
(VOID **) &I2cHost,
|
|
This->DriverBindingHandle,
|
|
Controller,
|
|
EFI_OPEN_PROTOCOL_GET_PROTOCOL
|
|
);
|
|
|
|
if (EFI_ERROR (Status)) {
|
|
return EFI_DEVICE_ERROR;
|
|
}
|
|
|
|
I2cHostContext = I2C_HOST_CONTEXT_FROM_PROTOCOL (I2cHost);
|
|
|
|
//
|
|
// Raise TPL for critical section
|
|
//
|
|
TplPrevious = gBS->RaiseTPL (TPL_I2C_SYNC);
|
|
|
|
//
|
|
// If there is pending request or pending bus configuration, do not stop
|
|
//
|
|
Status = EFI_DEVICE_ERROR;
|
|
if (( !I2cHostContext->I2cBusConfigurationManagementPending )
|
|
&& IsListEmpty (&I2cHostContext->RequestList)) {
|
|
|
|
//
|
|
// Remove the I2C host protocol
|
|
//
|
|
Status = gBS->UninstallMultipleProtocolInterfaces (
|
|
Controller,
|
|
&gEfiI2cHostProtocolGuid,
|
|
I2cHost,
|
|
NULL
|
|
);
|
|
}
|
|
|
|
//
|
|
// Leave critical section
|
|
//
|
|
gBS->RestoreTPL (TplPrevious);
|
|
if (!EFI_ERROR (Status)) {
|
|
gBS->CloseProtocol (
|
|
Controller,
|
|
&gEfiI2cBusConfigurationManagementProtocolGuid,
|
|
This->DriverBindingHandle,
|
|
Controller
|
|
);
|
|
|
|
//
|
|
// Release I2c Host resources
|
|
//
|
|
if (I2cHostContext->I2cBusConfigurationEvent != NULL) {
|
|
gBS->CloseEvent (I2cHostContext->I2cBusConfigurationEvent);
|
|
I2cHostContext->I2cBusConfigurationEvent = NULL;
|
|
}
|
|
|
|
if (I2cHostContext->I2cEvent != NULL) {
|
|
gBS->CloseEvent (I2cHostContext->I2cEvent);
|
|
I2cHostContext->I2cEvent = NULL;
|
|
}
|
|
|
|
FreePool (I2cHostContext);
|
|
}
|
|
|
|
//
|
|
// Return the stop status
|
|
//
|
|
return Status;
|
|
}
|
|
|
|
/**
|
|
Handle the I2C bus configuration available event
|
|
|
|
This routine is called at TPL_I2C_SYNC.
|
|
|
|
@param[in] Event Address of an EFI_EVENT handle
|
|
@param[in] Context Address of an I2C_HOST_CONTEXT structure
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
I2cHostI2cBusConfigurationAvailable (
|
|
IN EFI_EVENT Event,
|
|
IN VOID *Context
|
|
)
|
|
{
|
|
I2C_HOST_CONTEXT *I2cHostContext;
|
|
EFI_I2C_MASTER_PROTOCOL *I2cMaster;
|
|
I2C_REQUEST *I2cRequest;
|
|
LIST_ENTRY *EntryHeader;
|
|
LIST_ENTRY *Entry;
|
|
EFI_STATUS Status;
|
|
|
|
//
|
|
// Mark this I2C bus configuration management operation as complete
|
|
//
|
|
I2cHostContext = (I2C_HOST_CONTEXT *)Context;
|
|
I2cMaster = I2cHostContext->I2cMaster;
|
|
ASSERT (I2cMaster != NULL);
|
|
//
|
|
// Clear flag to indicate I2C bus configuration is finished
|
|
//
|
|
I2cHostContext->I2cBusConfigurationManagementPending = FALSE;
|
|
|
|
//
|
|
// Validate the completion status
|
|
//
|
|
if (EFI_ERROR (I2cHostContext->Status)) {
|
|
//
|
|
// Setting I2C bus configuration failed before
|
|
//
|
|
I2cHostRequestComplete (I2cHostContext, I2cHostContext->Status);
|
|
|
|
//
|
|
// Unknown I2C bus configuration
|
|
// Force next operation to enable the I2C bus configuration
|
|
//
|
|
I2cHostContext->I2cBusConfiguration = (UINTN) -1;
|
|
|
|
//
|
|
// Do not continue current I2C request
|
|
//
|
|
return;
|
|
}
|
|
|
|
//
|
|
// Get the first request in the link with FIFO order
|
|
//
|
|
EntryHeader = &I2cHostContext->RequestList;
|
|
Entry = GetFirstNode (EntryHeader);
|
|
I2cRequest = I2C_REQUEST_FROM_ENTRY (Entry);
|
|
|
|
//
|
|
// Update the I2C bus configuration of the current I2C request
|
|
//
|
|
I2cHostContext->I2cBusConfiguration = I2cRequest->I2cBusConfiguration;
|
|
|
|
//
|
|
// Start an I2C operation on the host, the status is returned by I2cHostContext->Status
|
|
//
|
|
Status = I2cMaster->StartRequest (
|
|
I2cMaster,
|
|
I2cRequest->SlaveAddress,
|
|
I2cRequest->RequestPacket,
|
|
I2cHostContext->I2cEvent,
|
|
&I2cHostContext->Status
|
|
);
|
|
|
|
if (EFI_ERROR (Status)) {
|
|
DEBUG((DEBUG_ERROR, "I2cHostI2cBusConfigurationAvailable: Error starting I2C operation, %r\n", Status));
|
|
}
|
|
}
|
|
|
|
/**
|
|
Complete the current request
|
|
|
|
This routine is called at TPL_I2C_SYNC.
|
|
|
|
@param[in] I2cHostContext Address of an I2C_HOST_CONTEXT structure.
|
|
@param[in] Status Status of the I2C operation.
|
|
|
|
@return This routine returns the input status value.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
I2cHostRequestComplete (
|
|
I2C_HOST_CONTEXT *I2cHostContext,
|
|
EFI_STATUS Status
|
|
)
|
|
{
|
|
I2C_REQUEST *I2cRequest;
|
|
LIST_ENTRY *EntryHeader;
|
|
LIST_ENTRY *Entry;
|
|
|
|
//
|
|
// Remove the current I2C request from the list
|
|
//
|
|
EntryHeader = &I2cHostContext->RequestList;
|
|
Entry = GetFirstNode (EntryHeader);
|
|
I2cRequest = I2C_REQUEST_FROM_ENTRY (Entry);
|
|
|
|
//
|
|
// Save the status for QueueRequest
|
|
//
|
|
if ( NULL != I2cRequest->Status ) {
|
|
*I2cRequest->Status = Status;
|
|
}
|
|
|
|
//
|
|
// Notify the user of the I2C request completion
|
|
//
|
|
if ( NULL != I2cRequest->Event ) {
|
|
gBS->SignalEvent (I2cRequest->Event);
|
|
}
|
|
|
|
//
|
|
// Done with this request, remove the current request from list
|
|
//
|
|
RemoveEntryList (&I2cRequest->Link);
|
|
FreePool (I2cRequest->RequestPacket);
|
|
FreePool (I2cRequest);
|
|
|
|
//
|
|
// If there is more I2C request, start next one
|
|
//
|
|
if(!IsListEmpty (EntryHeader)) {
|
|
I2cHostRequestEnable (I2cHostContext);
|
|
}
|
|
|
|
return Status;
|
|
}
|
|
|
|
/**
|
|
Handle the bus available event
|
|
|
|
This routine is called at TPL_I2C_SYNC.
|
|
|
|
@param[in] Event Address of an EFI_EVENT handle
|
|
@param[in] Context Address of an I2C_HOST_CONTEXT structure
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
I2cHostRequestCompleteEvent (
|
|
IN EFI_EVENT Event,
|
|
IN VOID *Context
|
|
)
|
|
{
|
|
I2C_HOST_CONTEXT *I2cHostContext;
|
|
|
|
//
|
|
// Handle the completion event
|
|
//
|
|
I2cHostContext = (I2C_HOST_CONTEXT *)Context;
|
|
I2cHostRequestComplete (I2cHostContext, I2cHostContext->Status);
|
|
}
|
|
|
|
/**
|
|
Enable access to the I2C bus configuration
|
|
|
|
@param[in] I2cHostContext Address of an I2C_HOST_CONTEXT structure
|
|
|
|
@retval EFI_SUCCESS The operation completed successfully.
|
|
@retval EFI_ABORTED The request did not complete because the driver
|
|
was shutdown.
|
|
@retval EFI_BAD_BUFFER_SIZE The WriteBytes or ReadBytes buffer size is too large.
|
|
@retval EFI_DEVICE_ERROR There was an I2C error (NACK) during the operation.
|
|
This could indicate the slave device is not present.
|
|
@retval EFI_INVALID_PARAMETER RequestPacket is NULL
|
|
@retval EFI_NO_MAPPING Invalid I2cBusConfiguration value
|
|
@retval EFI_NO_RESPONSE The I2C device is not responding to the
|
|
slave address. EFI_DEVICE_ERROR may also be
|
|
returned if the controller can not distinguish
|
|
when the NACK occurred.
|
|
@retval EFI_NOT_FOUND I2C slave address exceeds maximum address
|
|
@retval EFI_NOT_READY I2C bus is busy or operation pending, wait for
|
|
the event and then read status.
|
|
@retval EFI_OUT_OF_RESOURCES Insufficient memory for I2C operation
|
|
@retval EFI_TIMEOUT The transaction did not complete within an internally
|
|
specified timeout period.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
I2cHostRequestEnable (
|
|
I2C_HOST_CONTEXT *I2cHostContext
|
|
)
|
|
{
|
|
UINTN I2cBusConfiguration;
|
|
CONST EFI_I2C_BUS_CONFIGURATION_MANAGEMENT_PROTOCOL *I2cBusConfigurationManagement;
|
|
I2C_REQUEST *I2cRequest;
|
|
EFI_STATUS Status;
|
|
EFI_TPL TplPrevious;
|
|
LIST_ENTRY *EntryHeader;
|
|
LIST_ENTRY *Entry;
|
|
|
|
//
|
|
// Assume pending request
|
|
//
|
|
Status = EFI_NOT_READY;
|
|
|
|
I2cBusConfigurationManagement = I2cHostContext->I2cBusConfigurationManagement;
|
|
|
|
//
|
|
// Validate the I2c bus configuration
|
|
//
|
|
EntryHeader = &I2cHostContext->RequestList;
|
|
Entry = GetFirstNode (EntryHeader);
|
|
I2cRequest = I2C_REQUEST_FROM_ENTRY (Entry);
|
|
|
|
I2cBusConfiguration = I2cRequest->I2cBusConfiguration;
|
|
|
|
if (I2cHostContext->I2cBusConfiguration != I2cBusConfiguration ) {
|
|
//
|
|
// Set flag to indicate I2C bus configuration is in progress
|
|
//
|
|
I2cHostContext->I2cBusConfigurationManagementPending = TRUE;
|
|
//
|
|
// Update bus configuration for this device's requesting bus configuration
|
|
//
|
|
Status = I2cBusConfigurationManagement->EnableI2cBusConfiguration (
|
|
I2cBusConfigurationManagement,
|
|
I2cBusConfiguration,
|
|
I2cHostContext->I2cBusConfigurationEvent,
|
|
&I2cHostContext->Status
|
|
);
|
|
} else {
|
|
//
|
|
// I2C bus configuration is same, no need change configuration and start I2c transaction directly
|
|
//
|
|
TplPrevious = gBS->RaiseTPL ( TPL_I2C_SYNC );
|
|
|
|
//
|
|
// Same I2C bus configuration
|
|
//
|
|
I2cHostContext->Status = EFI_SUCCESS;
|
|
I2cHostI2cBusConfigurationAvailable (I2cHostContext->I2cBusConfigurationEvent, I2cHostContext);
|
|
|
|
//
|
|
// Release the thread synchronization
|
|
//
|
|
gBS->RestoreTPL ( TplPrevious );
|
|
}
|
|
return Status;
|
|
}
|
|
|
|
/**
|
|
Queue an I2C operation for execution on the I2C controller.
|
|
|
|
This routine must be called at or below TPL_NOTIFY. For synchronous
|
|
requests this routine must be called at or below TPL_CALLBACK.
|
|
|
|
N.B. The typical consumers of this API are the I2C bus driver and
|
|
on rare occasions the I2C test application. Extreme care must be
|
|
taken by other consumers of this API to prevent confusing the
|
|
third party I2C drivers due to a state change at the I2C device
|
|
which the third party I2C drivers did not initiate. I2C platform
|
|
drivers may use this API within these guidelines.
|
|
|
|
This layer uses the concept of I2C bus configurations to describe
|
|
the I2C bus. An I2C bus configuration is defined as a unique
|
|
setting of the multiplexers and switches in the I2C bus which
|
|
enable access to one or more I2C devices. When using a switch
|
|
to divide a bus, due to speed differences, the I2C platform layer
|
|
would define an I2C bus configuration for the I2C devices on each
|
|
side of the switch. When using a multiplexer, the I2C platform
|
|
layer defines an I2C bus configuration for each of the selector
|
|
values required to control the multiplexer. See Figure 1 in the
|
|
<a href="http://www.nxp.com/documents/user_manual/UM10204.pdf">I<sup>2</sup>C
|
|
Specification</a> for a complex I2C bus configuration.
|
|
|
|
The I2C host driver processes all operations in FIFO order. Prior to
|
|
performing the operation, the I2C host driver calls the I2C platform
|
|
driver to reconfigure the switches and multiplexers in the I2C bus
|
|
enabling access to the specified I2C device. The I2C platform driver
|
|
also selects the maximum bus speed for the device. After the I2C bus
|
|
is configured, the I2C host driver calls the I2C port driver to
|
|
initialize the I2C controller and start the I2C operation.
|
|
|
|
@param[in] This Address of an EFI_I2C_HOST_PROTOCOL instance.
|
|
@param[in] I2cBusConfiguration I2C bus configuration to access the I2C
|
|
device.
|
|
@param[in] SlaveAddress Address of the device on the I2C bus.
|
|
@param[in] Event Event to set for asynchronous operations,
|
|
NULL for synchronous operations
|
|
@param[in] RequestPacket Address of an EFI_I2C_REQUEST_PACKET
|
|
structure describing the I2C operation
|
|
@param[out] I2cStatus Optional buffer to receive the I2C operation
|
|
completion status
|
|
|
|
@retval EFI_SUCCESS The operation completed successfully.
|
|
@retval EFI_BAD_BUFFER_SIZE The WriteBytes or ReadBytes buffer size is too large.
|
|
@retval EFI_DEVICE_ERROR There was an I2C error (NACK) during the operation.
|
|
This could indicate the slave device is not present.
|
|
@retval EFI_INVALID_PARAMETER RequestPacket is NULL
|
|
@retval EFI_INVALID_PARAMETER TPL is too high
|
|
@retval EFI_NO_MAPPING Invalid I2cBusConfiguration value
|
|
@retval EFI_NO_RESPONSE The I2C device is not responding to the
|
|
slave address. EFI_DEVICE_ERROR may also be
|
|
returned if the controller can not distinguish
|
|
when the NACK occurred.
|
|
@retval EFI_NOT_FOUND I2C slave address exceeds maximum address
|
|
@retval EFI_NOT_READY I2C bus is busy or operation pending, wait for
|
|
the event and then read status pointed to by
|
|
the request packet.
|
|
@retval EFI_OUT_OF_RESOURCES Insufficient memory for I2C operation
|
|
@retval EFI_TIMEOUT The transaction did not complete within an internally
|
|
specified timeout period.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
I2cHostQueueRequest (
|
|
IN CONST EFI_I2C_HOST_PROTOCOL *This,
|
|
IN UINTN I2cBusConfiguration,
|
|
IN UINTN SlaveAddress,
|
|
IN EFI_EVENT Event OPTIONAL,
|
|
IN EFI_I2C_REQUEST_PACKET *RequestPacket,
|
|
OUT EFI_STATUS *I2cStatus OPTIONAL
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
EFI_EVENT SyncEvent;
|
|
EFI_TPL TplPrevious;
|
|
I2C_REQUEST *I2cRequest;
|
|
I2C_HOST_CONTEXT *I2cHostContext;
|
|
BOOLEAN FirstRequest;
|
|
UINTN RequestPacketSize;
|
|
UINTN StartBit;
|
|
|
|
SyncEvent = NULL;
|
|
FirstRequest = FALSE;
|
|
Status = EFI_SUCCESS;
|
|
|
|
if (RequestPacket == NULL) {
|
|
return EFI_INVALID_PARAMETER;
|
|
}
|
|
|
|
if ((SlaveAddress & I2C_ADDRESSING_10_BIT) != 0) {
|
|
//
|
|
// 10-bit address, bits 0-9 are used for 10-bit I2C slave addresses,
|
|
// bits 10-30 are reserved bits and must be zero
|
|
//
|
|
StartBit = 10;
|
|
} else {
|
|
//
|
|
// 7-bit address, Bits 0-6 are used for 7-bit I2C slave addresses,
|
|
// bits 7-30 are reserved bits and must be zero
|
|
//
|
|
StartBit = 7;
|
|
}
|
|
|
|
if (BitFieldRead32 ((UINT32)SlaveAddress, StartBit, 30) != 0) {
|
|
//
|
|
// Reserved bit set in the SlaveAddress parameter
|
|
//
|
|
return EFI_NOT_FOUND;
|
|
}
|
|
|
|
I2cHostContext = I2C_HOST_CONTEXT_FROM_PROTOCOL (This);
|
|
|
|
if (Event == NULL) {
|
|
//
|
|
// For synchronous transaction, register an event used to wait for finishing synchronous transaction
|
|
//
|
|
Status = gBS->CreateEvent (
|
|
0,
|
|
TPL_I2C_SYNC,
|
|
NULL,
|
|
NULL,
|
|
&SyncEvent
|
|
);
|
|
if (EFI_ERROR (Status)) {
|
|
return Status;
|
|
}
|
|
}
|
|
|
|
//
|
|
// TPL should be at or below TPL_NOTIFY.
|
|
// For synchronous requests this routine must be called at or below TPL_CALLBACK.
|
|
//
|
|
TplPrevious = EfiGetCurrentTpl ();
|
|
if ((TplPrevious > TPL_I2C_SYNC) || ((Event == NULL) && (TplPrevious > TPL_CALLBACK))) {
|
|
DEBUG ((EFI_D_ERROR, "ERROR - TPL %d is too high!\n", TplPrevious));
|
|
return EFI_INVALID_PARAMETER;
|
|
}
|
|
|
|
//
|
|
// Allocate the request structure
|
|
//
|
|
I2cRequest = AllocateZeroPool (sizeof (I2C_REQUEST));
|
|
if (I2cRequest == NULL) {
|
|
DEBUG ((EFI_D_ERROR, "WARNING - Failed to allocate I2C_REQUEST!\n"));
|
|
return EFI_OUT_OF_RESOURCES;
|
|
}
|
|
|
|
//
|
|
// Initialize the request
|
|
//
|
|
I2cRequest->Signature = I2C_REQUEST_SIGNATURE;
|
|
I2cRequest->I2cBusConfiguration = I2cBusConfiguration;
|
|
I2cRequest->SlaveAddress = SlaveAddress;
|
|
I2cRequest->Event = (Event == NULL) ? SyncEvent : Event;
|
|
I2cRequest->Status = I2cStatus;
|
|
|
|
//
|
|
// Copy request packet into private buffer, as RequestPacket may be freed during asynchronous transaction
|
|
//
|
|
RequestPacketSize = sizeof (UINTN) + RequestPacket->OperationCount * sizeof (EFI_I2C_OPERATION);
|
|
I2cRequest->RequestPacket = AllocateZeroPool (RequestPacketSize);
|
|
ASSERT (I2cRequest->RequestPacket != NULL);
|
|
CopyMem (I2cRequest->RequestPacket, RequestPacket, RequestPacketSize);
|
|
|
|
//
|
|
// Synchronize with the other threads
|
|
//
|
|
gBS->RaiseTPL ( TPL_I2C_SYNC );
|
|
|
|
FirstRequest = IsListEmpty (&I2cHostContext->RequestList);
|
|
|
|
//
|
|
// Insert new I2C request in the list
|
|
//
|
|
InsertTailList (&I2cHostContext->RequestList, &I2cRequest->Link);
|
|
|
|
//
|
|
// Release the thread synchronization
|
|
//
|
|
gBS->RestoreTPL (TplPrevious);
|
|
|
|
if (FirstRequest) {
|
|
//
|
|
// Start the first I2C request, then the subsequent of I2C request will continue
|
|
//
|
|
Status = I2cHostRequestEnable (I2cHostContext);
|
|
}
|
|
|
|
if (Event != NULL) {
|
|
//
|
|
// For asynchronous, return EFI_SUCCESS indicating that the asynchronously I2C transaction was queued.
|
|
// No real I2C operation status in I2cStatus
|
|
//
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
//
|
|
// For synchronous transaction, wait for the operation completion
|
|
//
|
|
do {
|
|
Status = gBS->CheckEvent (SyncEvent);
|
|
} while (Status == EFI_NOT_READY);
|
|
|
|
//
|
|
// Get the I2C operation status
|
|
//
|
|
Status = I2cHostContext->Status;
|
|
|
|
//
|
|
// Return the I2C operation status
|
|
//
|
|
if (I2cStatus != NULL) {
|
|
*I2cStatus = Status;
|
|
}
|
|
|
|
//
|
|
// Close the event if necessary
|
|
//
|
|
if (SyncEvent != NULL) {
|
|
gBS->CloseEvent (SyncEvent);
|
|
}
|
|
|
|
return Status;
|
|
}
|
|
|
|
/**
|
|
The user Entry Point for I2C host module. The user code starts with this function.
|
|
|
|
@param[in] ImageHandle The firmware allocated handle for the EFI image.
|
|
@param[in] SystemTable A pointer to the EFI System Table.
|
|
|
|
@retval EFI_SUCCESS The entry point is executed successfully.
|
|
@retval other Some error occurs when executing this entry point.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
InitializeI2cHost(
|
|
IN EFI_HANDLE ImageHandle,
|
|
IN EFI_SYSTEM_TABLE *SystemTable
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
|
|
//
|
|
// Install driver model protocol(s).
|
|
//
|
|
Status = EfiLibInstallDriverBindingComponentName2 (
|
|
ImageHandle,
|
|
SystemTable,
|
|
&gI2cHostDriverBinding,
|
|
ImageHandle,
|
|
&gI2cHostComponentName,
|
|
&gI2cHostComponentName2
|
|
);
|
|
ASSERT_EFI_ERROR (Status);
|
|
return Status;
|
|
}
|
|
|
|
/**
|
|
This is the unload handle for I2C host module.
|
|
|
|
Disconnect the driver specified by ImageHandle from all the devices in the handle database.
|
|
Uninstall all the protocols installed in the driver entry point.
|
|
|
|
@param[in] ImageHandle The drivers' driver image.
|
|
|
|
@retval EFI_SUCCESS The image is unloaded.
|
|
@retval Others Failed to unload the image.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
I2cHostUnload (
|
|
IN EFI_HANDLE ImageHandle
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
EFI_HANDLE *DeviceHandleBuffer;
|
|
UINTN DeviceHandleCount;
|
|
UINTN Index;
|
|
EFI_COMPONENT_NAME_PROTOCOL *ComponentName;
|
|
EFI_COMPONENT_NAME2_PROTOCOL *ComponentName2;
|
|
|
|
//
|
|
// Get the list of all I2C Controller handles in the handle database.
|
|
// If there is an error getting the list, then the unload
|
|
// operation fails.
|
|
//
|
|
Status = gBS->LocateHandleBuffer (
|
|
ByProtocol,
|
|
&gEfiI2cHostProtocolGuid,
|
|
NULL,
|
|
&DeviceHandleCount,
|
|
&DeviceHandleBuffer
|
|
);
|
|
|
|
if (!EFI_ERROR (Status)) {
|
|
//
|
|
// Disconnect the driver specified by ImageHandle from all
|
|
// the devices in the handle database.
|
|
//
|
|
for (Index = 0; Index < DeviceHandleCount; Index++) {
|
|
Status = gBS->DisconnectController (
|
|
DeviceHandleBuffer[Index],
|
|
ImageHandle,
|
|
NULL
|
|
);
|
|
if (EFI_ERROR (Status)) {
|
|
goto Done;
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Uninstall all the protocols installed in the driver entry point
|
|
//
|
|
Status = gBS->UninstallMultipleProtocolInterfaces (
|
|
gI2cHostDriverBinding.DriverBindingHandle,
|
|
&gEfiDriverBindingProtocolGuid,
|
|
&gI2cHostDriverBinding,
|
|
NULL
|
|
);
|
|
ASSERT_EFI_ERROR (Status);
|
|
|
|
//
|
|
// Note we have to one by one uninstall the following protocols.
|
|
// It's because some of them are optionally installed based on
|
|
// the following PCD settings.
|
|
// gEfiMdePkgTokenSpaceGuid.PcdDriverDiagnosticsDisable
|
|
// gEfiMdePkgTokenSpaceGuid.PcdComponentNameDisable
|
|
// gEfiMdePkgTokenSpaceGuid.PcdDriverDiagnostics2Disable
|
|
// gEfiMdePkgTokenSpaceGuid.PcdComponentName2Disable
|
|
//
|
|
Status = gBS->HandleProtocol (
|
|
gI2cHostDriverBinding.DriverBindingHandle,
|
|
&gEfiComponentNameProtocolGuid,
|
|
(VOID **) &ComponentName
|
|
);
|
|
if (!EFI_ERROR (Status)) {
|
|
gBS->UninstallProtocolInterface (
|
|
gI2cHostDriverBinding.DriverBindingHandle,
|
|
&gEfiComponentNameProtocolGuid,
|
|
ComponentName
|
|
);
|
|
}
|
|
|
|
Status = gBS->HandleProtocol (
|
|
gI2cHostDriverBinding.DriverBindingHandle,
|
|
&gEfiComponentName2ProtocolGuid,
|
|
(VOID **) &ComponentName2
|
|
);
|
|
if (!EFI_ERROR (Status)) {
|
|
gBS->UninstallProtocolInterface (
|
|
gI2cHostDriverBinding.DriverBindingHandle,
|
|
&gEfiComponentName2ProtocolGuid,
|
|
ComponentName2
|
|
);
|
|
}
|
|
|
|
Status = EFI_SUCCESS;
|
|
|
|
Done:
|
|
//
|
|
// Free the buffer containing the list of handles from the handle database
|
|
//
|
|
if (DeviceHandleBuffer != NULL) {
|
|
gBS->FreePool (DeviceHandleBuffer);
|
|
}
|
|
|
|
return Status;
|
|
}
|