mirror of https://github.com/acidanthera/audk.git
1499 lines
54 KiB
C
1499 lines
54 KiB
C
/** @file
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This file implements I2C IO Protocol which enables the user to manipulate a single
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I2C device independent of the host controller and I2C design.
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Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "I2cDxe.h"
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//
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// EFI_DRIVER_BINDING_PROTOCOL instance
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//
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EFI_DRIVER_BINDING_PROTOCOL gI2cBusDriverBinding = {
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I2cBusDriverSupported,
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I2cBusDriverStart,
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I2cBusDriverStop,
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0x10,
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NULL,
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NULL
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};
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//
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// Template for I2C Bus Child Device.
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//
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I2C_DEVICE_CONTEXT gI2cDeviceContextTemplate = {
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I2C_DEVICE_SIGNATURE,
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NULL,
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{ // I2cIo Protocol
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I2cBusQueueRequest, // QueueRequest
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NULL, // DeviceGuid
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0, // DeviceIndex
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0, // HardwareRevision
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NULL // I2cControllerCapabilities
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},
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NULL, // DevicePath
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NULL, // I2cDevice
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NULL, // I2cBusContext
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};
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//
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// Template for controller device path node.
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//
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CONTROLLER_DEVICE_PATH gControllerDevicePathTemplate = {
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{
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HARDWARE_DEVICE_PATH,
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HW_CONTROLLER_DP,
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{
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(UINT8) (sizeof (CONTROLLER_DEVICE_PATH)),
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(UINT8) ((sizeof (CONTROLLER_DEVICE_PATH)) >> 8)
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}
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},
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0
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};
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//
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// Template for vendor device path node.
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//
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VENDOR_DEVICE_PATH gVendorDevicePathTemplate = {
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{
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HARDWARE_DEVICE_PATH,
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HW_VENDOR_DP,
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{
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(UINT8) (sizeof (VENDOR_DEVICE_PATH)),
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(UINT8) ((sizeof (VENDOR_DEVICE_PATH)) >> 8)
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}
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},
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{ 0x0, 0x0, 0x0, { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 }}
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};
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//
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// Driver name table
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//
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GLOBAL_REMOVE_IF_UNREFERENCED EFI_UNICODE_STRING_TABLE mI2cBusDriverNameTable[] = {
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{ "eng;en", (CHAR16 *) L"I2C Bus Driver" },
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{ NULL , NULL }
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};
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//
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// EFI Component Name Protocol
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//
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GLOBAL_REMOVE_IF_UNREFERENCED EFI_COMPONENT_NAME_PROTOCOL gI2cBusComponentName = {
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(EFI_COMPONENT_NAME_GET_DRIVER_NAME) I2cBusComponentNameGetDriverName,
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(EFI_COMPONENT_NAME_GET_CONTROLLER_NAME) I2cBusComponentNameGetControllerName,
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"eng"
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};
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//
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// EFI Component Name 2 Protocol
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//
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GLOBAL_REMOVE_IF_UNREFERENCED EFI_COMPONENT_NAME2_PROTOCOL gI2cBusComponentName2 = {
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I2cBusComponentNameGetDriverName,
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I2cBusComponentNameGetControllerName,
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"en"
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};
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/**
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Retrieves a Unicode string that is the user readable name of the driver.
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This function retrieves the user readable name of a driver in the form of a
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Unicode string. If the driver specified by This has a user readable name in
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the language specified by Language, then a pointer to the driver name is
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returned in DriverName, and EFI_SUCCESS is returned. If the driver specified
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by This does not support the language specified by Language,
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then EFI_UNSUPPORTED is returned.
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@param This[in] A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or
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EFI_COMPONENT_NAME_PROTOCOL instance.
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@param Language[in] A pointer to a Null-terminated ASCII string
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array indicating the language. This is the
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language of the driver name that the caller is
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requesting, and it must match one of the
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languages specified in SupportedLanguages. The
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number of languages supported by a driver is up
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to the driver writer. Language is specified
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in RFC 4646 or ISO 639-2 language code format.
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@param DriverName[out] A pointer to the Unicode string to return.
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This Unicode string is the name of the
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driver specified by This in the language
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specified by Language.
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@retval EFI_SUCCESS The Unicode string for the Driver specified by
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This and the language specified by Language was
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returned in DriverName.
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@retval EFI_INVALID_PARAMETER Language is NULL.
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@retval EFI_INVALID_PARAMETER DriverName is NULL.
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@retval EFI_UNSUPPORTED The driver specified by This does not support
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the language specified by Language.
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**/
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EFI_STATUS
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EFIAPI
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I2cBusComponentNameGetDriverName (
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IN EFI_COMPONENT_NAME2_PROTOCOL *This,
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IN CHAR8 *Language,
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OUT CHAR16 **DriverName
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)
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{
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return LookupUnicodeString2 (
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Language,
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This->SupportedLanguages,
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mI2cBusDriverNameTable,
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DriverName,
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(BOOLEAN)(This != &gI2cBusComponentName2)
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);
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}
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/**
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Retrieves a Unicode string that is the user readable name of the controller
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that is being managed by a driver.
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This function retrieves the user readable name of the controller specified by
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ControllerHandle and ChildHandle in the form of a Unicode string. If the
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driver specified by This has a user readable name in the language specified by
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Language, then a pointer to the controller name is returned in ControllerName,
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and EFI_SUCCESS is returned. If the driver specified by This is not currently
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managing the controller specified by ControllerHandle and ChildHandle,
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then EFI_UNSUPPORTED is returned. If the driver specified by This does not
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support the language specified by Language, then EFI_UNSUPPORTED is returned.
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@param This[in] A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or
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EFI_COMPONENT_NAME_PROTOCOL instance.
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@param ControllerHandle[in] The handle of a controller that the driver
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specified by This is managing. This handle
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specifies the controller whose name is to be
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returned.
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@param ChildHandle[in] The handle of the child controller to retrieve
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the name of. This is an optional parameter that
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may be NULL. It will be NULL for device
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drivers. It will also be NULL for a bus drivers
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that wish to retrieve the name of the bus
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controller. It will not be NULL for a bus
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driver that wishes to retrieve the name of a
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child controller.
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@param Language[in] A pointer to a Null-terminated ASCII string
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array indicating the language. This is the
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language of the driver name that the caller is
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requesting, and it must match one of the
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languages specified in SupportedLanguages. The
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number of languages supported by a driver is up
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to the driver writer. Language is specified in
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RFC 4646 or ISO 639-2 language code format.
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@param ControllerName[out] A pointer to the Unicode string to return.
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This Unicode string is the name of the
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controller specified by ControllerHandle and
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ChildHandle in the language specified by
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Language from the point of view of the driver
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specified by This.
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@retval EFI_SUCCESS The Unicode string for the user readable name in
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the language specified by Language for the
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driver specified by This was returned in
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DriverName.
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@retval EFI_INVALID_PARAMETER ControllerHandle is NULL.
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@retval EFI_INVALID_PARAMETER ChildHandle is not NULL and it is not a valid
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EFI_HANDLE.
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@retval EFI_INVALID_PARAMETER Language is NULL.
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@retval EFI_INVALID_PARAMETER ControllerName is NULL.
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@retval EFI_UNSUPPORTED The driver specified by This is not currently
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managing the controller specified by
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ControllerHandle and ChildHandle.
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@retval EFI_UNSUPPORTED The driver specified by This does not support
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the language specified by Language.
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**/
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EFI_STATUS
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EFIAPI
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I2cBusComponentNameGetControllerName (
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IN EFI_COMPONENT_NAME2_PROTOCOL *This,
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IN EFI_HANDLE ControllerHandle,
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IN EFI_HANDLE ChildHandle OPTIONAL,
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IN CHAR8 *Language,
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OUT CHAR16 **ControllerName
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)
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{
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return EFI_UNSUPPORTED;
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}
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/**
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Check if the child of I2C controller has been created.
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@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
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@param[in] Controller I2C controller handle.
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@param[in] RemainingDevicePath A pointer to the remaining portion of a device path.
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@param[in] RemainingHasControllerNode Indicate if RemainingDevicePath contains CONTROLLER_DEVICE_PATH.
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@param[in] RemainingControllerNumber Controller number in CONTROLLER_DEVICE_PATH.
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@retval EFI_SUCCESS The child of I2C controller is not created.
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@retval Others The child of I2C controller has been created or other errors happen.
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**/
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EFI_STATUS
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CheckRemainingDevicePath (
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IN EFI_DRIVER_BINDING_PROTOCOL *This,
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IN EFI_HANDLE Controller,
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IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath,
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IN BOOLEAN RemainingHasControllerNode,
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IN UINT32 RemainingControllerNumber
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)
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{
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EFI_STATUS Status;
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EFI_DEVICE_PATH_PROTOCOL *SystemDevicePath;
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EFI_OPEN_PROTOCOL_INFORMATION_ENTRY *OpenInfoBuffer;
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UINTN EntryCount;
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UINTN Index;
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BOOLEAN SystemHasControllerNode;
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UINT32 SystemControllerNumber;
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SystemHasControllerNode = FALSE;
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SystemControllerNumber = 0;
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Status = gBS->OpenProtocolInformation (
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Controller,
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&gEfiI2cHostProtocolGuid,
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&OpenInfoBuffer,
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&EntryCount
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);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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for (Index = 0; Index < EntryCount; Index++) {
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if ((OpenInfoBuffer[Index].Attributes & EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER) != 0) {
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Status = gBS->OpenProtocol (
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OpenInfoBuffer[Index].ControllerHandle,
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&gEfiDevicePathProtocolGuid,
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(VOID **) &SystemDevicePath,
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This->DriverBindingHandle,
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Controller,
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EFI_OPEN_PROTOCOL_GET_PROTOCOL
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);
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if (!EFI_ERROR (Status)) {
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//
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// Find vendor device path node and compare
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//
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while (!IsDevicePathEnd (SystemDevicePath)) {
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if ((DevicePathType (SystemDevicePath) == HARDWARE_DEVICE_PATH) &&
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(DevicePathSubType (SystemDevicePath) == HW_VENDOR_DP)) {
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//
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// Check if vendor device path is same between system device path and remaining device path
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//
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if (CompareMem (SystemDevicePath, RemainingDevicePath, sizeof (VENDOR_DEVICE_PATH)) == 0) {
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//
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// Get controller node appended after vendor node
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//
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SystemDevicePath = NextDevicePathNode (SystemDevicePath);
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if ((DevicePathType (SystemDevicePath) == HARDWARE_DEVICE_PATH) &&
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(DevicePathSubType (SystemDevicePath) == HW_CONTROLLER_DP)) {
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SystemHasControllerNode = TRUE;
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SystemControllerNumber = ((CONTROLLER_DEVICE_PATH *) SystemDevicePath)->ControllerNumber;
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} else {
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SystemHasControllerNode = FALSE;
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SystemControllerNumber = 0;
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}
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if (((SystemHasControllerNode) && (!RemainingHasControllerNode) && (SystemControllerNumber == 0)) ||
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((!SystemHasControllerNode) && (RemainingHasControllerNode) && (RemainingControllerNumber == 0)) ||
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((SystemHasControllerNode) && (RemainingHasControllerNode) && (SystemControllerNumber == RemainingControllerNumber)) ||
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((!SystemHasControllerNode) && (!RemainingHasControllerNode))) {
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DEBUG ((EFI_D_ERROR, "This I2C device has been already started.\n"));
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Status = EFI_UNSUPPORTED;
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break;
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}
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}
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}
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SystemDevicePath = NextDevicePathNode (SystemDevicePath);
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}
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if (EFI_ERROR (Status)) {
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break;
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}
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}
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}
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}
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FreePool (OpenInfoBuffer);
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return Status;
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}
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/**
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Tests to see if this driver supports a given controller. If a child device is provided,
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it further tests to see if this driver supports creating a handle for the specified child device.
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This function checks to see if the driver specified by This supports the device specified by
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ControllerHandle. Drivers will typically use the device path attached to
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ControllerHandle and/or the services from the bus I/O abstraction attached to
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ControllerHandle to determine if the driver supports ControllerHandle. This function
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may be called many times during platform initialization. In order to reduce boot times, the tests
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performed by this function must be very small, and take as little time as possible to execute. This
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function must not change the state of any hardware devices, and this function must be aware that the
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device specified by ControllerHandle may already be managed by the same driver or a
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different driver. This function must match its calls to AllocatePages() with FreePages(),
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AllocatePool() with FreePool(), and OpenProtocol() with CloseProtocol().
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Since ControllerHandle may have been previously started by the same driver, if a protocol is
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already in the opened state, then it must not be closed with CloseProtocol(). This is required
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to guarantee the state of ControllerHandle is not modified by this function.
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@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
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@param[in] ControllerHandle The handle of the controller to test. This handle
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must support a protocol interface that supplies
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an I/O abstraction to the driver.
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@param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This
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parameter is ignored by device drivers, and is optional for bus
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drivers. For bus drivers, if this parameter is not NULL, then
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the bus driver must determine if the bus controller specified
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by ControllerHandle and the child controller specified
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by RemainingDevicePath are both supported by this
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bus driver.
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@retval EFI_SUCCESS The device specified by ControllerHandle and
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RemainingDevicePath is supported by the driver specified by This.
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@retval EFI_ALREADY_STARTED The device specified by ControllerHandle and
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RemainingDevicePath is already being managed by the driver
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specified by This.
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@retval EFI_ACCESS_DENIED The device specified by ControllerHandle and
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RemainingDevicePath is already being managed by a different
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driver or an application that requires exclusive access.
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Currently not implemented.
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@retval EFI_UNSUPPORTED The device specified by ControllerHandle and
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RemainingDevicePath is not supported by the driver specified by This.
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**/
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EFI_STATUS
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EFIAPI
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I2cBusDriverSupported (
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IN EFI_DRIVER_BINDING_PROTOCOL *This,
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IN EFI_HANDLE Controller,
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IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
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)
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{
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EFI_STATUS Status;
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EFI_I2C_ENUMERATE_PROTOCOL *I2cEnumerate;
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EFI_I2C_HOST_PROTOCOL *I2cHost;
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EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath;
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EFI_DEVICE_PATH_PROTOCOL *DevPathNode;
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BOOLEAN RemainingHasControllerNode;
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UINT32 RemainingControllerNumber;
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RemainingHasControllerNode = FALSE;
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RemainingControllerNumber = 0;
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//
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// Determine if the I2c Enumerate Protocol is available
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//
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Status = gBS->OpenProtocol (
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Controller,
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&gEfiI2cEnumerateProtocolGuid,
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(VOID **) &I2cEnumerate,
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This->DriverBindingHandle,
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Controller,
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EFI_OPEN_PROTOCOL_BY_DRIVER
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);
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if ((EFI_ERROR (Status)) && (Status != EFI_ALREADY_STARTED)) {
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return Status;
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}
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|
|
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if (!EFI_ERROR (Status)) {
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gBS->CloseProtocol (
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Controller,
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&gEfiI2cEnumerateProtocolGuid,
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This->DriverBindingHandle,
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Controller
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);
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}
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Status = gBS->OpenProtocol (
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Controller,
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&gEfiDevicePathProtocolGuid,
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(VOID **) &ParentDevicePath,
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This->DriverBindingHandle,
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Controller,
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EFI_OPEN_PROTOCOL_BY_DRIVER
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);
|
|
|
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if ((EFI_ERROR (Status)) && (Status != EFI_ALREADY_STARTED)) {
|
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return Status;
|
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}
|
|
|
|
if (!EFI_ERROR (Status)) {
|
|
gBS->CloseProtocol (
|
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Controller,
|
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&gEfiDevicePathProtocolGuid,
|
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This->DriverBindingHandle,
|
|
Controller
|
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);
|
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}
|
|
|
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if ((RemainingDevicePath != NULL) && !IsDevicePathEnd (RemainingDevicePath)) {
|
|
//
|
|
// Check if the first node of RemainingDevicePath is a hardware vendor device path
|
|
//
|
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if ((DevicePathType (RemainingDevicePath) != HARDWARE_DEVICE_PATH) ||
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(DevicePathSubType (RemainingDevicePath) != HW_VENDOR_DP)) {
|
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return EFI_UNSUPPORTED;
|
|
}
|
|
//
|
|
// Check if the second node of RemainingDevicePath is a controller node
|
|
//
|
|
DevPathNode = NextDevicePathNode (RemainingDevicePath);
|
|
if (!IsDevicePathEnd (DevPathNode)) {
|
|
if ((DevicePathType (DevPathNode) != HARDWARE_DEVICE_PATH) ||
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(DevicePathSubType (DevPathNode) != HW_CONTROLLER_DP)) {
|
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return EFI_UNSUPPORTED;
|
|
} else {
|
|
RemainingHasControllerNode = TRUE;
|
|
RemainingControllerNumber = ((CONTROLLER_DEVICE_PATH *) DevPathNode)->ControllerNumber;
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Determine if the I2C Host Protocol is available
|
|
//
|
|
Status = gBS->OpenProtocol (
|
|
Controller,
|
|
&gEfiI2cHostProtocolGuid,
|
|
(VOID **) &I2cHost,
|
|
This->DriverBindingHandle,
|
|
Controller,
|
|
EFI_OPEN_PROTOCOL_BY_DRIVER
|
|
);
|
|
|
|
if (!EFI_ERROR (Status)) {
|
|
gBS->CloseProtocol (
|
|
Controller,
|
|
&gEfiI2cHostProtocolGuid,
|
|
This->DriverBindingHandle,
|
|
Controller
|
|
);
|
|
}
|
|
|
|
|
|
if (Status == EFI_ALREADY_STARTED) {
|
|
if ((RemainingDevicePath == NULL) ||
|
|
((RemainingDevicePath != NULL) && IsDevicePathEnd (RemainingDevicePath))) {
|
|
//
|
|
// If RemainingDevicePath is NULL or is the End of Device Path Node, return EFI_SUCCESS.
|
|
//
|
|
Status = EFI_SUCCESS;
|
|
} else {
|
|
//
|
|
// Test if the child with the RemainingDevicePath has already been created.
|
|
//
|
|
Status = CheckRemainingDevicePath (
|
|
This,
|
|
Controller,
|
|
RemainingDevicePath,
|
|
RemainingHasControllerNode,
|
|
RemainingControllerNumber
|
|
);
|
|
}
|
|
}
|
|
|
|
return Status;
|
|
}
|
|
|
|
/**
|
|
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
|
|
I2cBusDriverStart (
|
|
IN EFI_DRIVER_BINDING_PROTOCOL *This,
|
|
IN EFI_HANDLE Controller,
|
|
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
|
|
)
|
|
{
|
|
EFI_I2C_ENUMERATE_PROTOCOL *I2cEnumerate;
|
|
EFI_I2C_HOST_PROTOCOL *I2cHost;
|
|
I2C_BUS_CONTEXT *I2cBusContext;
|
|
EFI_STATUS Status;
|
|
EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath;
|
|
|
|
I2cBusContext = NULL;
|
|
ParentDevicePath = NULL;
|
|
I2cEnumerate = NULL;
|
|
I2cHost = NULL;
|
|
|
|
//
|
|
// Determine if the I2C controller is available
|
|
//
|
|
Status = gBS->OpenProtocol (
|
|
Controller,
|
|
&gEfiI2cHostProtocolGuid,
|
|
(VOID**)&I2cHost,
|
|
This->DriverBindingHandle,
|
|
Controller,
|
|
EFI_OPEN_PROTOCOL_BY_DRIVER
|
|
);
|
|
if (EFI_ERROR (Status) && (Status != EFI_ALREADY_STARTED)) {
|
|
DEBUG ((EFI_D_ERROR, "I2cBus: open I2C host error, Status = %r\n", Status));
|
|
return Status;
|
|
}
|
|
|
|
if (Status == EFI_ALREADY_STARTED) {
|
|
Status = gBS->OpenProtocol (
|
|
Controller,
|
|
&gEfiCallerIdGuid,
|
|
(VOID **) &I2cBusContext,
|
|
This->DriverBindingHandle,
|
|
Controller,
|
|
EFI_OPEN_PROTOCOL_GET_PROTOCOL
|
|
);
|
|
if (EFI_ERROR (Status)) {
|
|
DEBUG ((EFI_D_ERROR, "I2cBus: open private protocol error, Status = %r.\n", Status));
|
|
return Status;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Get the I2C bus enumeration API
|
|
//
|
|
Status = gBS->OpenProtocol (
|
|
Controller,
|
|
&gEfiI2cEnumerateProtocolGuid,
|
|
(VOID**)&I2cEnumerate,
|
|
This->DriverBindingHandle,
|
|
Controller,
|
|
EFI_OPEN_PROTOCOL_BY_DRIVER
|
|
);
|
|
if (EFI_ERROR (Status) && (Status != EFI_ALREADY_STARTED)) {
|
|
DEBUG ((EFI_D_ERROR, "I2cBus: open I2C enumerate error, Status = %r\n", Status));
|
|
goto Error;
|
|
}
|
|
|
|
Status = gBS->OpenProtocol (
|
|
Controller,
|
|
&gEfiDevicePathProtocolGuid,
|
|
(VOID **) &ParentDevicePath,
|
|
This->DriverBindingHandle,
|
|
Controller,
|
|
EFI_OPEN_PROTOCOL_BY_DRIVER
|
|
);
|
|
if (EFI_ERROR (Status) && (Status != EFI_ALREADY_STARTED)) {
|
|
DEBUG ((EFI_D_ERROR, "I2cBus: open device path error, Status = %r\n", Status));
|
|
goto Error;
|
|
}
|
|
|
|
if ((RemainingDevicePath != NULL) && IsDevicePathEnd (RemainingDevicePath)) {
|
|
//
|
|
// If RemainingDevicePath is the End of Device Path Node,
|
|
// don't create any child device and return EFI_SUCESS
|
|
//
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
//
|
|
// Allocate the buffer for I2C_BUS_CONTEXT if it is not allocated before.
|
|
//
|
|
if (I2cBusContext == NULL) {
|
|
//
|
|
// Allocate the I2C context structure for the current I2C controller
|
|
//
|
|
I2cBusContext = AllocateZeroPool (sizeof (I2C_BUS_CONTEXT));
|
|
if (I2cBusContext == NULL) {
|
|
DEBUG ((EFI_D_ERROR, "I2cBus: there is no enough memory to allocate.\n"));
|
|
Status = EFI_OUT_OF_RESOURCES;
|
|
goto Error;
|
|
}
|
|
|
|
/*
|
|
+----------------+
|
|
.->| I2C_BUS_CONTEXT|<----- This file Protocol (gEfiCallerIdGuid) installed on I2C Controller handle
|
|
| +----------------+
|
|
|
|
|
| +----------------------------+
|
|
| | I2C_DEVICE_CONTEXT |
|
|
`--| |
|
|
| |
|
|
| I2C IO Protocol Structure | <----- I2C IO Protocol
|
|
| |
|
|
+----------------------------+
|
|
|
|
*/
|
|
I2cBusContext->I2cHost = I2cHost;
|
|
I2cBusContext->I2cEnumerate = I2cEnumerate;
|
|
//
|
|
// Parent controller used to create children
|
|
//
|
|
I2cBusContext->Controller = Controller;
|
|
//
|
|
// Parent controller device path used to create children device path
|
|
//
|
|
I2cBusContext->ParentDevicePath = ParentDevicePath;
|
|
|
|
I2cBusContext->DriverBindingHandle = This->DriverBindingHandle;
|
|
|
|
Status = gBS->InstallMultipleProtocolInterfaces (
|
|
&Controller,
|
|
&gEfiCallerIdGuid,
|
|
I2cBusContext,
|
|
NULL
|
|
);
|
|
if (EFI_ERROR (Status)) {
|
|
DEBUG ((EFI_D_ERROR, "I2cBus: install private protocol error, Status = %r.\n", Status));
|
|
goto Error;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Start the driver
|
|
//
|
|
Status = RegisterI2cDevice (I2cBusContext, Controller, RemainingDevicePath);
|
|
|
|
return Status;
|
|
|
|
Error:
|
|
if (EFI_ERROR (Status)) {
|
|
DEBUG ((EFI_D_ERROR, "I2cBus: Start() function failed, Status = %r\n", Status));
|
|
if (ParentDevicePath != NULL) {
|
|
gBS->CloseProtocol (
|
|
Controller,
|
|
&gEfiDevicePathProtocolGuid,
|
|
This->DriverBindingHandle,
|
|
Controller
|
|
);
|
|
}
|
|
|
|
if (I2cHost != NULL) {
|
|
gBS->CloseProtocol (
|
|
Controller,
|
|
&gEfiI2cHostProtocolGuid,
|
|
This->DriverBindingHandle,
|
|
Controller
|
|
);
|
|
}
|
|
|
|
if (I2cEnumerate != NULL) {
|
|
gBS->CloseProtocol (
|
|
Controller,
|
|
&gEfiI2cEnumerateProtocolGuid,
|
|
This->DriverBindingHandle,
|
|
Controller
|
|
);
|
|
}
|
|
|
|
if (I2cBusContext != NULL) {
|
|
Status = gBS->UninstallMultipleProtocolInterfaces (
|
|
&Controller,
|
|
gEfiCallerIdGuid,
|
|
I2cBusContext,
|
|
NULL
|
|
);
|
|
FreePool (I2cBusContext);
|
|
}
|
|
}
|
|
|
|
//
|
|
// 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
|
|
I2cBusDriverStop (
|
|
IN EFI_DRIVER_BINDING_PROTOCOL *This,
|
|
IN EFI_HANDLE Controller,
|
|
IN UINTN NumberOfChildren,
|
|
IN EFI_HANDLE *ChildHandleBuffer
|
|
)
|
|
{
|
|
I2C_BUS_CONTEXT *I2cBusContext;
|
|
EFI_STATUS Status;
|
|
BOOLEAN AllChildrenStopped;
|
|
UINTN Index;
|
|
|
|
if (NumberOfChildren == 0) {
|
|
gBS->CloseProtocol (
|
|
Controller,
|
|
&gEfiDevicePathProtocolGuid,
|
|
This->DriverBindingHandle,
|
|
Controller
|
|
);
|
|
|
|
gBS->CloseProtocol (
|
|
Controller,
|
|
&gEfiI2cHostProtocolGuid,
|
|
This->DriverBindingHandle,
|
|
Controller
|
|
);
|
|
|
|
gBS->CloseProtocol (
|
|
Controller,
|
|
&gEfiI2cEnumerateProtocolGuid,
|
|
This->DriverBindingHandle,
|
|
Controller
|
|
);
|
|
|
|
Status = gBS->OpenProtocol (
|
|
Controller,
|
|
&gEfiCallerIdGuid,
|
|
(VOID **) &I2cBusContext,
|
|
This->DriverBindingHandle,
|
|
Controller,
|
|
EFI_OPEN_PROTOCOL_GET_PROTOCOL
|
|
);
|
|
if (!EFI_ERROR (Status)) {
|
|
gBS->UninstallMultipleProtocolInterfaces (
|
|
Controller,
|
|
&gEfiCallerIdGuid,
|
|
I2cBusContext,
|
|
NULL
|
|
);
|
|
//
|
|
// No more child now, free bus context data.
|
|
//
|
|
FreePool (I2cBusContext);
|
|
}
|
|
return Status;
|
|
}
|
|
|
|
AllChildrenStopped = TRUE;
|
|
|
|
for (Index = 0; Index < NumberOfChildren; Index++) {
|
|
|
|
Status = UnRegisterI2cDevice (This, Controller, ChildHandleBuffer[Index]);
|
|
if (EFI_ERROR (Status)) {
|
|
AllChildrenStopped = FALSE;
|
|
}
|
|
}
|
|
|
|
if (!AllChildrenStopped) {
|
|
return EFI_DEVICE_ERROR;
|
|
}
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
Enumerate the I2C bus
|
|
|
|
This routine walks the platform specific data describing the
|
|
I2C bus to create the I2C devices where driver GUIDs were
|
|
specified.
|
|
|
|
@param[in] I2cBusContext Address of an I2C_BUS_CONTEXT structure
|
|
@param[in] Controller Handle to the controller
|
|
@param[in] RemainingDevicePath A pointer to the remaining portion of a device path.
|
|
|
|
@retval EFI_SUCCESS The bus is successfully configured
|
|
|
|
**/
|
|
EFI_STATUS
|
|
RegisterI2cDevice (
|
|
IN I2C_BUS_CONTEXT *I2cBusContext,
|
|
IN EFI_HANDLE Controller,
|
|
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
|
|
)
|
|
{
|
|
I2C_DEVICE_CONTEXT *I2cDeviceContext;
|
|
EFI_STATUS Status;
|
|
CONST EFI_I2C_DEVICE *Device;
|
|
CONST EFI_I2C_DEVICE *TempDevice;
|
|
UINT32 RemainingPathDeviceIndex;
|
|
EFI_DEVICE_PATH_PROTOCOL *DevPathNode;
|
|
BOOLEAN BuildControllerNode;
|
|
UINTN Count;
|
|
|
|
Status = EFI_SUCCESS;
|
|
BuildControllerNode = TRUE;
|
|
|
|
//
|
|
// Default DeviceIndex
|
|
//
|
|
RemainingPathDeviceIndex = 0;
|
|
|
|
//
|
|
// Determine the controller number in Controller Node Device Path when RemainingDevicePath is not NULL.
|
|
//
|
|
if (RemainingDevicePath != NULL) {
|
|
//
|
|
// Check if there is a controller node appended after vendor node
|
|
//
|
|
DevPathNode = NextDevicePathNode (RemainingDevicePath);
|
|
if ((DevicePathType (DevPathNode) == HARDWARE_DEVICE_PATH) &&
|
|
(DevicePathSubType(DevPathNode) == HW_CONTROLLER_DP)) {
|
|
//
|
|
// RemainingDevicePath != NULL and RemainingDevicePath contains Controller Node,
|
|
// add Controller Node to Device Path on child handle.
|
|
//
|
|
RemainingPathDeviceIndex = ((CONTROLLER_DEVICE_PATH *) DevPathNode)->ControllerNumber;
|
|
} else {
|
|
//
|
|
// RemainingDevicePath != NULL and RemainingDevicePath does not contain Controller Node,
|
|
// do not add controller node to Device Path on child handle.
|
|
//
|
|
BuildControllerNode = FALSE;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Walk the list of I2C devices on this bus
|
|
//
|
|
Device = NULL;
|
|
while (TRUE) {
|
|
//
|
|
// Get the next I2C device
|
|
//
|
|
Status = I2cBusContext->I2cEnumerate->Enumerate (I2cBusContext->I2cEnumerate, &Device);
|
|
if (EFI_ERROR (Status) || Device == NULL) {
|
|
if (RemainingDevicePath != NULL) {
|
|
Status = EFI_NOT_FOUND;
|
|
} else {
|
|
Status = EFI_SUCCESS;
|
|
}
|
|
break;
|
|
}
|
|
|
|
//
|
|
// Determine if the device info is valid
|
|
//
|
|
if ((Device->DeviceGuid == NULL) || (Device->SlaveAddressCount == 0) || (Device->SlaveAddressArray == NULL)) {
|
|
DEBUG ((EFI_D_ERROR, "Invalid EFI_I2C_DEVICE reported by I2c Enumerate protocol.\n"));
|
|
continue;
|
|
}
|
|
|
|
if (RemainingDevicePath == NULL) {
|
|
if (Device->DeviceIndex == 0) {
|
|
//
|
|
// Determine if the controller node is necessary when controller number is zero in I2C device
|
|
//
|
|
TempDevice = NULL;
|
|
Count = 0;
|
|
while (TRUE) {
|
|
//
|
|
// Get the next I2C device
|
|
//
|
|
Status = I2cBusContext->I2cEnumerate->Enumerate (I2cBusContext->I2cEnumerate, &TempDevice);
|
|
if (EFI_ERROR (Status) || TempDevice == NULL) {
|
|
Status = EFI_SUCCESS;
|
|
break;
|
|
}
|
|
if (CompareGuid (Device->DeviceGuid, TempDevice->DeviceGuid)) {
|
|
Count++;
|
|
}
|
|
}
|
|
if (Count == 1) {
|
|
//
|
|
// RemainingDevicePath == NULL and only DeviceIndex 0 is present on the I2C bus,
|
|
// do not add Controller Node to Device Path on child handle.
|
|
//
|
|
BuildControllerNode = FALSE;
|
|
}
|
|
}
|
|
} else {
|
|
//
|
|
// Find I2C device reported in Remaining Device Path
|
|
//
|
|
if ((!CompareGuid (&((VENDOR_DEVICE_PATH *)RemainingDevicePath)->Guid, Device->DeviceGuid)) ||
|
|
(RemainingPathDeviceIndex != Device->DeviceIndex)) {
|
|
continue;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Build the device context for current I2C device.
|
|
//
|
|
I2cDeviceContext = NULL;
|
|
I2cDeviceContext = AllocateCopyPool (sizeof (I2C_DEVICE_CONTEXT), &gI2cDeviceContextTemplate);
|
|
ASSERT (I2cDeviceContext != NULL);
|
|
if (I2cDeviceContext == NULL) {
|
|
continue;
|
|
}
|
|
|
|
//
|
|
// Initialize the specific device context
|
|
//
|
|
I2cDeviceContext->I2cBusContext = I2cBusContext;
|
|
I2cDeviceContext->I2cDevice = Device;
|
|
I2cDeviceContext->I2cIo.DeviceGuid = Device->DeviceGuid;
|
|
I2cDeviceContext->I2cIo.DeviceIndex = Device->DeviceIndex;
|
|
I2cDeviceContext->I2cIo.HardwareRevision = Device->HardwareRevision;
|
|
I2cDeviceContext->I2cIo.I2cControllerCapabilities = I2cBusContext->I2cHost->I2cControllerCapabilities;
|
|
|
|
//
|
|
// Build the device path
|
|
//
|
|
Status = I2cBusDevicePathAppend (I2cDeviceContext, BuildControllerNode);
|
|
ASSERT_EFI_ERROR (Status);
|
|
if (EFI_ERROR (Status)) {
|
|
continue;
|
|
}
|
|
|
|
//
|
|
// Install the protocol
|
|
//
|
|
Status = gBS->InstallMultipleProtocolInterfaces (
|
|
&I2cDeviceContext->Handle,
|
|
&gEfiI2cIoProtocolGuid,
|
|
&I2cDeviceContext->I2cIo,
|
|
&gEfiDevicePathProtocolGuid,
|
|
I2cDeviceContext->DevicePath,
|
|
NULL );
|
|
if (EFI_ERROR (Status)) {
|
|
//
|
|
// Free resources for this I2C device
|
|
//
|
|
ReleaseI2cDeviceContext (I2cDeviceContext);
|
|
continue;
|
|
}
|
|
|
|
//
|
|
// Create the child handle
|
|
//
|
|
Status = gBS->OpenProtocol (
|
|
Controller,
|
|
&gEfiI2cHostProtocolGuid,
|
|
(VOID **) &I2cBusContext->I2cHost,
|
|
I2cBusContext->DriverBindingHandle,
|
|
I2cDeviceContext->Handle,
|
|
EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
|
|
);
|
|
if (EFI_ERROR (Status)) {
|
|
Status = gBS->UninstallMultipleProtocolInterfaces (
|
|
I2cDeviceContext->Handle,
|
|
&gEfiDevicePathProtocolGuid,
|
|
I2cDeviceContext->DevicePath,
|
|
&gEfiI2cIoProtocolGuid,
|
|
&I2cDeviceContext->I2cIo,
|
|
NULL
|
|
);
|
|
//
|
|
// Free resources for this I2C device
|
|
//
|
|
ReleaseI2cDeviceContext (I2cDeviceContext);
|
|
continue;
|
|
}
|
|
|
|
if (RemainingDevicePath != NULL) {
|
|
//
|
|
// Child has been created successfully
|
|
//
|
|
break;
|
|
}
|
|
}
|
|
|
|
return Status;
|
|
}
|
|
|
|
|
|
/**
|
|
Queue an I2C transaction for execution on the I2C device.
|
|
|
|
This routine must be called at or below TPL_NOTIFY. For synchronous
|
|
requests this routine must be called at or below TPL_CALLBACK.
|
|
|
|
This routine queues an I2C transaction to the I2C controller for
|
|
execution on the I2C bus.
|
|
|
|
When Event is NULL, QueueRequest() operates synchronously and returns
|
|
the I2C completion status as its return value.
|
|
|
|
When Event is not NULL, QueueRequest() synchronously returns EFI_SUCCESS
|
|
indicating that the asynchronous I2C transaction was queued. The values
|
|
above are returned in the buffer pointed to by I2cStatus upon the
|
|
completion of the I2C transaction when I2cStatus is not NULL.
|
|
|
|
The upper layer driver writer provides the following to the platform
|
|
vendor:
|
|
|
|
1. Vendor specific GUID for the I2C part
|
|
2. Guidance on proper construction of the slave address array when the
|
|
I2C device uses more than one slave address. The I2C bus protocol
|
|
uses the SlaveAddressIndex to perform relative to physical address
|
|
translation to access the blocks of hardware within the I2C device.
|
|
|
|
@param[in] This Pointer to an EFI_I2C_IO_PROTOCOL structure.
|
|
@param[in] SlaveAddressIndex Index value into an array of slave addresses
|
|
for the I2C device. The values in the array
|
|
are specified by the board designer, with the
|
|
third party I2C device driver writer providing
|
|
the slave address order.
|
|
|
|
For devices that have a single slave address,
|
|
this value must be zero. If the I2C device
|
|
uses more than one slave address then the
|
|
third party (upper level) I2C driver writer
|
|
needs to specify the order of entries in the
|
|
slave address array.
|
|
|
|
\ref ThirdPartyI2cDrivers "Third Party I2C
|
|
Drivers" section in I2cMaster.h.
|
|
@param[in] Event Event to signal for asynchronous transactions,
|
|
NULL for synchronous transactions
|
|
@param[in] RequestPacket Pointer to an EFI_I2C_REQUEST_PACKET structure
|
|
describing the I2C transaction
|
|
@param[out] I2cStatus Optional buffer to receive the I2C transaction
|
|
completion status
|
|
|
|
@retval EFI_SUCCESS The asynchronous transaction was successfully
|
|
queued when Event is not NULL.
|
|
@retval EFI_SUCCESS The transaction completed successfully when
|
|
Event is NULL.
|
|
@retval EFI_BAD_BUFFER_SIZE The RequestPacket->LengthInBytes value is too
|
|
large.
|
|
@retval EFI_DEVICE_ERROR There was an I2C error (NACK) during the
|
|
transaction.
|
|
@retval EFI_INVALID_PARAMETER RequestPacket is NULL
|
|
@retval EFI_NO_MAPPING The EFI_I2C_HOST_PROTOCOL could not set the
|
|
bus configuration required to access this I2C
|
|
device.
|
|
@retval EFI_NO_RESPONSE The I2C device is not responding to the slave
|
|
address selected by SlaveAddressIndex.
|
|
EFI_DEVICE_ERROR will be returned if the
|
|
controller cannot distinguish when the NACK
|
|
occurred.
|
|
@retval EFI_OUT_OF_RESOURCES Insufficient memory for I2C transaction
|
|
@retval EFI_UNSUPPORTED The controller does not support the requested
|
|
transaction.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
I2cBusQueueRequest (
|
|
IN CONST EFI_I2C_IO_PROTOCOL *This,
|
|
IN UINTN SlaveAddressIndex,
|
|
IN EFI_EVENT Event OPTIONAL,
|
|
IN EFI_I2C_REQUEST_PACKET *RequestPacket,
|
|
OUT EFI_STATUS *I2cStatus OPTIONAL
|
|
)
|
|
{
|
|
CONST EFI_I2C_DEVICE *I2cDevice;
|
|
I2C_BUS_CONTEXT *I2cBusContext;
|
|
CONST EFI_I2C_HOST_PROTOCOL *I2cHost;
|
|
I2C_DEVICE_CONTEXT *I2cDeviceContext;
|
|
EFI_STATUS Status;
|
|
|
|
if (RequestPacket == NULL) {
|
|
return EFI_INVALID_PARAMETER;
|
|
}
|
|
|
|
//
|
|
// Validate the I2C slave index
|
|
//
|
|
I2cDeviceContext = I2C_DEVICE_CONTEXT_FROM_PROTOCOL (This);
|
|
I2cDevice = I2cDeviceContext->I2cDevice;
|
|
if ( SlaveAddressIndex >= I2cDevice->SlaveAddressCount ) {
|
|
return EFI_INVALID_PARAMETER;
|
|
}
|
|
|
|
//
|
|
// Locate the I2c Host Protocol to queue request
|
|
//
|
|
I2cBusContext = I2cDeviceContext->I2cBusContext;
|
|
I2cHost = I2cBusContext->I2cHost;
|
|
|
|
//
|
|
// Start the I2C operation
|
|
//
|
|
Status = I2cHost->QueueRequest (
|
|
I2cHost,
|
|
I2cDevice->I2cBusConfiguration,
|
|
I2cDevice->SlaveAddressArray [SlaveAddressIndex],
|
|
Event,
|
|
RequestPacket,
|
|
I2cStatus
|
|
);
|
|
|
|
return Status;
|
|
}
|
|
|
|
/**
|
|
Release all the resources allocated for the I2C device.
|
|
|
|
This function releases all the resources allocated for the I2C device.
|
|
|
|
@param I2cDeviceContext The I2C child device involved for the operation.
|
|
|
|
**/
|
|
VOID
|
|
ReleaseI2cDeviceContext (
|
|
IN I2C_DEVICE_CONTEXT *I2cDeviceContext
|
|
)
|
|
{
|
|
if (I2cDeviceContext == NULL) {
|
|
return;
|
|
}
|
|
|
|
if (I2cDeviceContext->DevicePath != NULL) {
|
|
FreePool (I2cDeviceContext->DevicePath);
|
|
}
|
|
|
|
FreePool (I2cDeviceContext);
|
|
}
|
|
|
|
/**
|
|
Unregister an I2C device.
|
|
|
|
This function removes the protocols installed on the controller handle and
|
|
frees the resources allocated for the I2C device.
|
|
|
|
@param This The pointer to EFI_DRIVER_BINDING_PROTOCOL instance.
|
|
@param Controller The controller handle of the I2C device.
|
|
@param Handle The child handle.
|
|
|
|
@retval EFI_SUCCESS The I2C device is successfully unregistered.
|
|
@return Others Some error occurs when unregistering the I2C device.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
UnRegisterI2cDevice (
|
|
IN EFI_DRIVER_BINDING_PROTOCOL *This,
|
|
IN EFI_HANDLE Controller,
|
|
IN EFI_HANDLE Handle
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
I2C_DEVICE_CONTEXT *I2cDeviceContext;
|
|
EFI_I2C_IO_PROTOCOL *I2cIo;
|
|
EFI_I2C_HOST_PROTOCOL *I2cHost;
|
|
|
|
I2cIo = NULL;
|
|
|
|
Status = gBS->OpenProtocol (
|
|
Handle,
|
|
&gEfiI2cIoProtocolGuid,
|
|
(VOID **) &I2cIo,
|
|
This->DriverBindingHandle,
|
|
Controller,
|
|
EFI_OPEN_PROTOCOL_GET_PROTOCOL
|
|
);
|
|
if (EFI_ERROR (Status)) {
|
|
return Status;
|
|
}
|
|
|
|
//
|
|
// Get I2c device context data.
|
|
//
|
|
I2cDeviceContext = I2C_DEVICE_CONTEXT_FROM_PROTOCOL (I2cIo);
|
|
|
|
//
|
|
// Close the child handle
|
|
//
|
|
gBS->CloseProtocol (
|
|
Controller,
|
|
&gEfiI2cHostProtocolGuid,
|
|
This->DriverBindingHandle,
|
|
Handle
|
|
);
|
|
|
|
//
|
|
// The I2C Bus driver installs the I2C Io and Device Path Protocol in the DriverBindingStart().
|
|
// Here should uninstall them.
|
|
//
|
|
Status = gBS->UninstallMultipleProtocolInterfaces (
|
|
Handle,
|
|
&gEfiDevicePathProtocolGuid,
|
|
I2cDeviceContext->DevicePath,
|
|
&gEfiI2cIoProtocolGuid,
|
|
&I2cDeviceContext->I2cIo,
|
|
NULL
|
|
);
|
|
|
|
if (EFI_ERROR (Status)) {
|
|
//
|
|
// Keep parent and child relationship
|
|
//
|
|
gBS->OpenProtocol (
|
|
Controller,
|
|
&gEfiI2cHostProtocolGuid,
|
|
(VOID **) &I2cHost,
|
|
This->DriverBindingHandle,
|
|
Handle,
|
|
EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
|
|
);
|
|
return Status;
|
|
}
|
|
|
|
//
|
|
// Free resources for this I2C device
|
|
//
|
|
ReleaseI2cDeviceContext (I2cDeviceContext);
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
Create a path for the I2C device
|
|
|
|
Append the I2C slave path to the I2C master controller path.
|
|
|
|
@param[in] I2cDeviceContext Address of an I2C_DEVICE_CONTEXT structure.
|
|
@param[in] BuildControllerNode Flag to build controller node in device path.
|
|
|
|
@retval EFI_SUCCESS The I2C device path is built successfully.
|
|
@return Others It is failed to built device path.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
I2cBusDevicePathAppend (
|
|
IN I2C_DEVICE_CONTEXT *I2cDeviceContext,
|
|
IN BOOLEAN BuildControllerNode
|
|
)
|
|
{
|
|
EFI_DEVICE_PATH_PROTOCOL *PreviousDevicePath;
|
|
|
|
PreviousDevicePath = NULL;
|
|
|
|
//
|
|
// Build vendor device path
|
|
//
|
|
CopyMem (&gVendorDevicePathTemplate.Guid, I2cDeviceContext->I2cDevice->DeviceGuid, sizeof (EFI_GUID));
|
|
I2cDeviceContext->DevicePath = AppendDevicePathNode (
|
|
I2cDeviceContext->I2cBusContext->ParentDevicePath,
|
|
(EFI_DEVICE_PATH_PROTOCOL *) &gVendorDevicePathTemplate
|
|
);
|
|
ASSERT (I2cDeviceContext->DevicePath != NULL);
|
|
if (I2cDeviceContext->DevicePath == NULL) {
|
|
return EFI_OUT_OF_RESOURCES;
|
|
}
|
|
|
|
if ((BuildControllerNode) && (I2cDeviceContext->DevicePath != NULL)) {
|
|
//
|
|
// Build the final I2C device path with controller node
|
|
//
|
|
PreviousDevicePath = I2cDeviceContext->DevicePath;
|
|
gControllerDevicePathTemplate.ControllerNumber = I2cDeviceContext->I2cDevice->DeviceIndex;
|
|
I2cDeviceContext->DevicePath = AppendDevicePathNode (
|
|
I2cDeviceContext->DevicePath,
|
|
(EFI_DEVICE_PATH_PROTOCOL *) &gControllerDevicePathTemplate
|
|
);
|
|
gBS->FreePool (PreviousDevicePath);
|
|
ASSERT (I2cDeviceContext->DevicePath != NULL);
|
|
if (I2cDeviceContext->DevicePath == NULL) {
|
|
return EFI_OUT_OF_RESOURCES;
|
|
}
|
|
}
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
The user entry point for the I2C bus 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
|
|
InitializeI2cBus(
|
|
IN EFI_HANDLE ImageHandle,
|
|
IN EFI_SYSTEM_TABLE *SystemTable
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
|
|
//
|
|
// Install driver model protocol(s).
|
|
//
|
|
Status = EfiLibInstallDriverBindingComponentName2 (
|
|
ImageHandle,
|
|
SystemTable,
|
|
&gI2cBusDriverBinding,
|
|
NULL,
|
|
&gI2cBusComponentName,
|
|
&gI2cBusComponentName2
|
|
);
|
|
ASSERT_EFI_ERROR (Status);
|
|
|
|
|
|
return Status;
|
|
}
|
|
|
|
/**
|
|
This is the unload handle for I2C bus 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
|
|
I2cBusUnload (
|
|
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 Driver BindingHandle from all
|
|
// the devices in the handle database.
|
|
//
|
|
for (Index = 0; Index < DeviceHandleCount; Index++) {
|
|
Status = gBS->DisconnectController (
|
|
DeviceHandleBuffer[Index],
|
|
gI2cBusDriverBinding.DriverBindingHandle,
|
|
NULL
|
|
);
|
|
if (EFI_ERROR (Status)) {
|
|
goto Done;
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Uninstall all the protocols installed in the driver entry point
|
|
//
|
|
Status = gBS->UninstallMultipleProtocolInterfaces (
|
|
gI2cBusDriverBinding.DriverBindingHandle,
|
|
&gEfiDriverBindingProtocolGuid,
|
|
&gI2cBusDriverBinding,
|
|
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 (
|
|
gI2cBusDriverBinding.DriverBindingHandle,
|
|
&gEfiComponentNameProtocolGuid,
|
|
(VOID **) &ComponentName
|
|
);
|
|
if (!EFI_ERROR (Status)) {
|
|
gBS->UninstallProtocolInterface (
|
|
gI2cBusDriverBinding.DriverBindingHandle,
|
|
&gEfiComponentNameProtocolGuid,
|
|
ComponentName
|
|
);
|
|
}
|
|
|
|
Status = gBS->HandleProtocol (
|
|
gI2cBusDriverBinding.DriverBindingHandle,
|
|
&gEfiComponentName2ProtocolGuid,
|
|
(VOID **) &ComponentName2
|
|
);
|
|
if (!EFI_ERROR (Status)) {
|
|
gBS->UninstallProtocolInterface (
|
|
gI2cBusDriverBinding.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;
|
|
}
|