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167 lines
7.0 KiB
C
167 lines
7.0 KiB
C
/** @file
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I2C I/O Protocol as defined in the PI 1.3 specification.
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The EFI I2C I/O protocol 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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SPDX-License-Identifier: BSD-2-Clause-Patent
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@par Revision Reference:
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This protocol is from PI Version 1.3.
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**/
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#ifndef __I2C_IO_H__
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#define __I2C_IO_H__
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#include <Pi/PiI2c.h>
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#define EFI_I2C_IO_PROTOCOL_GUID { 0xb60a3e6b, 0x18c4, 0x46e5, { 0xa2, 0x9a, 0xc9, 0xa1, 0x06, 0x65, 0xa2, 0x8e }}
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///
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/// I2C I/O protocol
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///
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/// The I2C IO protocol enables access to a specific device on the I2C
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/// bus.
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///
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/// Each I2C device is identified uniquely in the system by the tuple
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/// DeviceGuid:DeviceIndex. The DeviceGuid represents the manufacture
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/// and part number and is provided by the silicon vendor or the third
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/// party I2C device driver writer. The DeviceIndex identifies the part
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/// within the system by using a unique number and is created by the
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/// board designer or the writer of the EFI_I2C_ENUMERATE_PROTOCOL.
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///
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/// I2C slave addressing is abstracted to validate addresses and limit
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/// operation to the specified I2C device. The third party providing
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/// the I2C device support provides an ordered list of slave addresses
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/// for the I2C device required to implement the EFI_I2C_ENUMERATE_PROTOCOL.
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/// The order of the list must be preserved.
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///
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typedef struct _EFI_I2C_IO_PROTOCOL EFI_I2C_IO_PROTOCOL;
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/**
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Queue an I2C transaction for execution on the I2C device.
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This routine must be called at or below TPL_NOTIFY. For synchronous
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requests this routine must be called at or below TPL_CALLBACK.
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This routine queues an I2C transaction to the I2C controller for
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execution on the I2C bus.
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When Event is NULL, QueueRequest() operates synchronously and returns
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the I2C completion status as its return value.
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When Event is not NULL, QueueRequest() synchronously returns EFI_SUCCESS
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indicating that the asynchronous I2C transaction was queued. The values
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above are returned in the buffer pointed to by I2cStatus upon the
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completion of the I2C transaction when I2cStatus is not NULL.
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The upper layer driver writer provides the following to the platform
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vendor:
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1. Vendor specific GUID for the I2C part
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2. Guidance on proper construction of the slave address array when the
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I2C device uses more than one slave address. The I2C bus protocol
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uses the SlaveAddressIndex to perform relative to physical address
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translation to access the blocks of hardware within the I2C device.
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@param[in] This Pointer to an EFI_I2C_IO_PROTOCOL structure.
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@param[in] SlaveAddressIndex Index value into an array of slave addresses
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for the I2C device. The values in the array
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are specified by the board designer, with the
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third party I2C device driver writer providing
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the slave address order.
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For devices that have a single slave address,
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this value must be zero. If the I2C device
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uses more than one slave address then the
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third party (upper level) I2C driver writer
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needs to specify the order of entries in the
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slave address array.
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\ref ThirdPartyI2cDrivers "Third Party I2C
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Drivers" section in I2cMaster.h.
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@param[in] Event Event to signal for asynchronous transactions,
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NULL for synchronous transactions
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@param[in] RequestPacket Pointer to an EFI_I2C_REQUEST_PACKET structure
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describing the I2C transaction
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@param[out] I2cStatus Optional buffer to receive the I2C transaction
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completion status
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@retval EFI_SUCCESS The asynchronous transaction was successfully
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queued when Event is not NULL.
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@retval EFI_SUCCESS The transaction completed successfully when
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Event is NULL.
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@retval EFI_BAD_BUFFER_SIZE The RequestPacket->LengthInBytes value is too
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large.
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@retval EFI_DEVICE_ERROR There was an I2C error (NACK) during the
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transaction.
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@retval EFI_INVALID_PARAMETER RequestPacket is NULL.
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@retval EFI_NO_MAPPING The EFI_I2C_HOST_PROTOCOL could not set the
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bus configuration required to access this I2C
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device.
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@retval EFI_NO_RESPONSE The I2C device is not responding to the slave
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address selected by SlaveAddressIndex.
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EFI_DEVICE_ERROR will be returned if the
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controller cannot distinguish when the NACK
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occurred.
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@retval EFI_OUT_OF_RESOURCES Insufficient memory for I2C transaction
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@retval EFI_UNSUPPORTED The controller does not support the requested
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transaction.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_I2C_IO_PROTOCOL_QUEUE_REQUEST) (
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IN CONST EFI_I2C_IO_PROTOCOL *This,
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IN UINTN SlaveAddressIndex,
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IN EFI_EVENT Event OPTIONAL,
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IN EFI_I2C_REQUEST_PACKET *RequestPacket,
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OUT EFI_STATUS *I2cStatus OPTIONAL
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);
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///
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/// I2C I/O protocol
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///
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struct _EFI_I2C_IO_PROTOCOL {
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///
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/// Queue an I2C transaction for execution on the I2C device.
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///
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EFI_I2C_IO_PROTOCOL_QUEUE_REQUEST QueueRequest;
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///
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/// Unique value assigned by the silicon manufacture or the third
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/// party I2C driver writer for the I2C part. This value logically
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/// combines both the manufacture name and the I2C part number into
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/// a single value specified as a GUID.
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///
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CONST EFI_GUID *DeviceGuid;
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///
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/// Unique ID of the I2C part within the system
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///
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UINT32 DeviceIndex;
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///
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/// Hardware revision - ACPI _HRV value. See the Advanced Configuration
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/// and Power Interface Specification, Revision 5.0 for the field format
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/// and the Plug and play support for I2C web-page for restriction on values.
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///
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UINT32 HardwareRevision;
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///
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/// Pointer to an EFI_I2C_CONTROLLER_CAPABILITIES data structure containing
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/// the capabilities of the I2C host controller.
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///
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CONST EFI_I2C_CONTROLLER_CAPABILITIES *I2cControllerCapabilities;
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};
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///
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/// Reference to variable defined in the .DEC file
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///
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extern EFI_GUID gEfiI2cIoProtocolGuid;
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#endif // __I2C_IO_H__
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