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/** @file
This file declares the EFI SMBus Host Controller protocol
Copyright (c) 2006, Intel Corporation
All rights reserved. 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.
Module Name: Smbus.h
@par Revision Reference:
This protocol is defined in Framework of EFI SMBus Host Controller Specification
Version 0.9
**/
#ifndef _EFI_SMBUS_H
#define _EFI_SMBUS_H
#define EFI_SMBUS_HC_PROTOCOL_GUID \
{ \
0xe49d33ed, 0x513d, 0x4634, {0xb6, 0x98, 0x6f, 0x55, 0xaa, 0x75, 0x1c, 0x1b } \
}
typedef struct _EFI_SMBUS_HC_PROTOCOL EFI_SMBUS_HC_PROTOCOL;
/**
Executes an SMBus operation to an SMBus controller.
@param This A pointer to the EFI_SMBUS_HC_PROTOCOL instance.
@param SlaveAddress The SMBus slave address of the device with which to communicate.
@param Command This command is transmitted by the SMBus host
controller to the SMBus slave device and the interpretation is
SMBus slave device specific.
@param Operation Signifies which particular SMBus hardware protocol
instance that it will use to execute the SMBus transactions.
@param PecCheck Defines if Packet Error Code (PEC) checking is required
for this operation.
@param Length Signifies the number of bytes that this operation will do.
@param Buffer Contains the value of data to execute to the SMBus slave device.
@retval EFI_SUCCESS The last data that was returned from the access
matched the poll exit criteria.
@retval EFI_CRC_ERROR The checksum is not correct (PEC is incorrect)
@retval EFI_TIMEOUT Timeout expired before the operation was completed.
Timeout is determined by the SMBus host controller device.
@retval EFI_OUT_OF_RESOURCES The request could not be completed
due to a lack of resources.
@retval EFI_DEVICE_ERROR The request was not completed because
a failure reflected in the Host Status Register bit.
@retval EFI_INVALID_PARAMETER Operation is not defined in EFI_SMBUS_OPERATION.
Or Length/Buffer is NULL for operations except for EfiSmbusQuickRead and
EfiSmbusQuickWrite. Length is outside the range of valid values.
@retval EFI_UNSUPPORTED The SMBus operation or PEC is not supported.
@retval EFI_BUFFER_TOO_SMALL Buffer is not sufficient for this operation.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_SMBUS_HC_EXECUTE_OPERATION) (
IN EFI_SMBUS_HC_PROTOCOL *This,
IN EFI_SMBUS_DEVICE_ADDRESS SlaveAddress,
IN EFI_SMBUS_DEVICE_COMMAND Command,
IN EFI_SMBUS_OPERATION Operation,
IN BOOLEAN PecCheck,
IN OUT UINTN *Length,
IN OUT VOID *Buffer
);
typedef struct {
UINT32 VendorSpecificId;
UINT16 SubsystemDeviceId;
UINT16 SubsystemVendorId;
UINT16 Interface;
UINT16 DeviceId;
UINT16 VendorId;
UINT8 VendorRevision;
UINT8 DeviceCapabilities;
} EFI_SMBUS_UDID;
/**
CallBack function can be registered in EFI_SMBUS_HC_PROTOCOL_NOTIFY.
@param SlaveAddress The SMBUS hardware address to which the SMBUS
device is preassigned or allocated.
@param Data Data of the SMBus host notify command that
the caller wants to be called.
@return Status Code
**/
typedef
EFI_STATUS
(EFIAPI *EFI_SMBUS_NOTIFY_FUNCTION) (
IN EFI_SMBUS_DEVICE_ADDRESS SlaveAddress,
IN UINTN Data
);
/**
Sets the SMBus slave device addresses for the device with a given unique ID
or enumerates the entire bus.
@param This A pointer to the EFI_SMBUS_HC_PROTOCOL instance.
@param ArpAll A Boolean expression that indicates if the host drivers need
to enumerate all the devices or enumerate only the device that is identified
by SmbusUdid. If ArpAll is TRUE, SmbusUdid and SlaveAddress are optional.
If ArpAll is FALSE, ArpDevice will enumerate SmbusUdid and the address
will be at SlaveAddress.
@param SmbusUdid The Unique Device Identifier (UDID) that is associated
with this device.
@param SlaveAddress The SMBus slave address that is associated with an SMBus UDID.
@retval EFI_SUCCESS The SMBus slave device address was set.
@retval EFI_INVALID_PARAMETER SlaveAddress is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed
due to a lack of resources.
@retval EFI_TIMEOUT The SMBus slave device did not respond.
@retval EFI_DEVICE_ERROR The request was not completed because the transaction failed.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_SMBUS_HC_PROTOCOL_ARP_DEVICE) (
IN EFI_SMBUS_HC_PROTOCOL *This,
IN BOOLEAN ArpAll,
IN EFI_SMBUS_UDID *SmbusUdid, OPTIONAL
IN OUT EFI_SMBUS_DEVICE_ADDRESS *SlaveAddress OPTIONAL
);
typedef struct {
EFI_SMBUS_DEVICE_ADDRESS SmbusDeviceAddress;
EFI_SMBUS_UDID SmbusDeviceUdid;
} EFI_SMBUS_DEVICE_MAP;
/**
The GetArpMap() function returns the mapping of all the SMBus devices
that are enumerated by the SMBus host driver.
@param This A pointer to the EFI_SMBUS_HC_PROTOCOL instance.
@param Length Size of the buffer that contains the SMBus device map.
@param SmbusDeviceMap The pointer to the device map as enumerated
by the SMBus controller driver.
@retval EFI_SUCCESS The device map was returned correctly in the buffer.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_SMBUS_HC_PROTOCOL_GET_ARP_MAP) (
IN EFI_SMBUS_HC_PROTOCOL *This,
IN OUT UINTN *Length,
IN OUT EFI_SMBUS_DEVICE_MAP **SmbusDeviceMap
);
/**
The Notify() function registers all the callback functions to allow the
bus driver to call these functions when the SlaveAddress/Data pair happens.
@param This A pointer to the EFI_SMBUS_HC_PROTOCOL instance.
@param SlaveAddress Address that the host controller detects as
sending a message and calls all the registered functions.
@param Data Data that the host controller detects as sending a message
and calls all the registered functions.
@param NotifyFunction The function to call when the bus driver
detects the SlaveAddress and Data pair.
@retval EFI_SUCCESS NotifyFunction was registered.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_SMBUS_HC_PROTOCOL_NOTIFY) (
IN EFI_SMBUS_HC_PROTOCOL *This,
IN EFI_SMBUS_DEVICE_ADDRESS SlaveAddress,
IN UINTN Data,
IN EFI_SMBUS_NOTIFY_FUNCTION NotifyFunction
);
/**
@par Protocol Description:
Provides basic SMBus host controller management and basic data
transactions over the SMBus.
@param Execute
Executes the SMBus operation to an SMBus slave device.
@param ArpDevice
Allows an SMBus 2.0 device(s) to be Address Resolution Protocol (ARP)
@param GetArpMap
Allows a driver to retrieve the address that was allocated by the SMBus
host controller during enumeration/ARP.
@param Notify
Allows a driver to register for a callback to the SMBus host
controller driver when the bus issues a notification to the bus controller driver.
**/
struct _EFI_SMBUS_HC_PROTOCOL {
EFI_SMBUS_HC_EXECUTE_OPERATION Execute;
EFI_SMBUS_HC_PROTOCOL_ARP_DEVICE ArpDevice;
EFI_SMBUS_HC_PROTOCOL_GET_ARP_MAP GetArpMap;
EFI_SMBUS_HC_PROTOCOL_NOTIFY Notify;
};
extern EFI_GUID gEfiSmbusProtocolGuid;
#endif
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