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a67d1f18 | 1 | /** @file\r |
b2cefd7c | 2 | Implementation of SmBusLib class library for PEI phase.\r |
a67d1f18 | 3 | \r |
1c2f052d | 4 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r |
22a69a5e | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
a67d1f18 | 6 | \r |
a67d1f18 | 7 | **/\r |
8 | \r | |
9 | #include "InternalSmbusLib.h"\r | |
10 | \r | |
11 | /**\r | |
12 | Gets Smbus PPIs.\r | |
13 | \r | |
14 | This internal function retrieves Smbus PPI from PPI database.\r | |
b2cefd7c | 15 | If gEfiPeiSmbusPpiGuid can not be located, then ASSERT()\r |
1c2f052d | 16 | \r |
a67d1f18 | 17 | @return The pointer to Smbus PPI.\r |
18 | \r | |
19 | **/\r | |
20 | EFI_PEI_SMBUS_PPI *\r | |
21 | InternalGetSmbusPpi (\r | |
22936e95 | 22 | VOID\r |
1c2f052d | 23 | )\r |
a67d1f18 | 24 | {\r |
25 | EFI_STATUS Status;\r | |
26 | EFI_PEI_SMBUS_PPI *SmbusPpi;\r | |
27 | \r | |
22936e95 | 28 | Status = PeiServicesLocatePpi (&gEfiPeiSmbusPpiGuid, 0, NULL, (VOID **) &SmbusPpi);\r |
a67d1f18 | 29 | ASSERT_EFI_ERROR (Status);\r |
30 | ASSERT (SmbusPpi != NULL);\r | |
31 | \r | |
32 | return SmbusPpi;\r | |
33 | }\r | |
34 | \r | |
35 | /**\r | |
1c2f052d | 36 | Executes an SMBus operation to an SMBus controller.\r |
a67d1f18 | 37 | \r |
38 | This function provides a standard way to execute Smbus script\r | |
39 | as defined in the SmBus Specification. The data can either be of\r | |
40 | the Length byte, word, or a block of data.\r | |
41 | \r | |
42 | @param SmbusOperation Signifies which particular SMBus hardware protocol instance that it will use to\r | |
43 | execute the SMBus transactions.\r | |
44 | @param SmBusAddress Address that encodes the SMBUS Slave Address,\r | |
45 | SMBUS Command, SMBUS Data Length, and PEC.\r | |
46 | @param Length Signifies the number of bytes that this operation will do. The maximum number of\r | |
47 | bytes can be revision specific and operation specific.\r | |
48 | @param Buffer Contains the value of data to execute to the SMBus slave device. Not all operations\r | |
49 | require this argument. The length of this buffer is identified by Length.\r | |
50 | @param Status Return status for the executed command.\r | |
51 | This is an optional parameter and may be NULL.\r | |
52 | \r | |
53 | @return The actual number of bytes that are executed for this operation..\r | |
54 | \r | |
55 | **/\r | |
56 | UINTN\r | |
57 | InternalSmBusExec (\r | |
58 | IN EFI_SMBUS_OPERATION SmbusOperation,\r | |
59 | IN UINTN SmBusAddress,\r | |
60 | IN UINTN Length,\r | |
61 | IN OUT VOID *Buffer,\r | |
62 | OUT RETURN_STATUS *Status OPTIONAL\r | |
63 | )\r | |
64 | {\r | |
65 | EFI_PEI_SMBUS_PPI *SmbusPpi;\r | |
0c39efcc | 66 | CONST EFI_PEI_SERVICES **PeiServices;\r |
a67d1f18 | 67 | RETURN_STATUS ReturnStatus;\r |
68 | EFI_SMBUS_DEVICE_ADDRESS SmbusDeviceAddress;\r | |
69 | \r | |
70 | PeiServices = GetPeiServicesTablePointer ();\r | |
22936e95 | 71 | SmbusPpi = InternalGetSmbusPpi ();\r |
a67d1f18 | 72 | SmbusDeviceAddress.SmbusDeviceAddress = SMBUS_LIB_SLAVE_ADDRESS (SmBusAddress);\r |
73 | \r | |
74 | ReturnStatus = SmbusPpi->Execute (\r | |
0c39efcc | 75 | (EFI_PEI_SERVICES **) PeiServices,\r |
a67d1f18 | 76 | SmbusPpi,\r |
77 | SmbusDeviceAddress,\r | |
78 | SMBUS_LIB_COMMAND (SmBusAddress),\r | |
79 | SmbusOperation,\r | |
1c2f052d | 80 | SMBUS_LIB_PEC (SmBusAddress),\r |
a67d1f18 | 81 | &Length,\r |
82 | Buffer\r | |
83 | );\r | |
84 | if (Status != NULL) {\r | |
85 | *Status = ReturnStatus;\r | |
86 | }\r | |
87 | \r | |
88 | return Length;\r | |
89 | }\r |