/** @file
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Main file for Ps2 keyboard controller library.
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Copyright (c) 2019 - 2020, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "BdsPs2KbcLib.h"
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GLOBAL_REMOVE_IF_UNREFERENCED PLATFORM_KEYBOARD_DEVICE_PATH gKeyboardDevicePath = {
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gPciRootBridge,
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{
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{
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HARDWARE_DEVICE_PATH,
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HW_PCI_DP,
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{
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(UINT8) (sizeof (PCI_DEVICE_PATH)),
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(UINT8) ((sizeof (PCI_DEVICE_PATH)) >> 8)
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}
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},
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0, // Function, patched in EnumPs2Keyboard
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0 // Device, patched in EnumPs2Keyboard
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},
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{
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{
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ACPI_DEVICE_PATH,
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ACPI_DP,
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{
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(UINT8) (sizeof (ACPI_HID_DEVICE_PATH)),
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(UINT8) ((sizeof (ACPI_HID_DEVICE_PATH)) >> 8)
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}
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},
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EISA_PNP_ID(0x0303),
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0
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},
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gEndEntire
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};
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/**
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Check if PS2 keyboard is conntected, by sending ECHO command.
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@retval TRUE if connected FALSE otherwise
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**/
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BOOLEAN
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DetectPs2Keyboard (
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VOID
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)
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{
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UINT32 TimeOut;
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UINT8 Data;
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UINT32 SumTimeOut;
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BOOLEAN FoundPs2Kbc;
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TimeOut = 0;
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FoundPs2Kbc = FALSE;
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//
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// Wait for input buffer empty
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//
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for (TimeOut = 0; TimeOut < PS2_KEYBOARD_TIMEOUT; TimeOut += 30) {
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if ((IoRead8 (KEYBOARD_8042_STATUS_REGISTER) & 0x02) == 0) {
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FoundPs2Kbc = TRUE;
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break;
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}
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MicroSecondDelay (30);
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}
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if (!FoundPs2Kbc) {
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return FALSE;
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}
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//
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// Send echo command
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//
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IoWrite8 (KEYBOARD_8042_DATA_REGISTER, KBC_INPBUF_VIA60_KBECHO);
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//
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// Init variables
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//
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FoundPs2Kbc = FALSE;
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TimeOut = 0;
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SumTimeOut = 0;
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Data = 0;
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//
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// Read from 8042 (multiple times if needed)
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// until the expected value appears
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// use SumTimeOut to control the iteration
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//
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while (1) {
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//
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// Perform a read
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//
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for (TimeOut = 0; TimeOut < PS2_KEYBOARD_TIMEOUT; TimeOut += 30) {
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if (IoRead8 (KEYBOARD_8042_STATUS_REGISTER) & 0x01) {
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Data = IoRead8 (KEYBOARD_8042_DATA_REGISTER);
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break;
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}
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MicroSecondDelay (30);
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}
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SumTimeOut += TimeOut;
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if (Data == KBC_INPBUF_VIA60_KBECHO) {
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FoundPs2Kbc = TRUE;
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break;
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}
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if (SumTimeOut >= PS2_KEYBOARD_WAITFORVALUE_TIMEOUT) {
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break;
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}
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}
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return FoundPs2Kbc;
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}
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/**
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Check if PS2 keyboard is conntected. If the result of first time is
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error, it will retry again.
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@retval TRUE if connected FALSE otherwise
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**/
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BOOLEAN
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IsPs2KeyboardConnected (
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VOID
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)
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{
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BOOLEAN Result;
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Result = DetectPs2Keyboard ();
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if (!Result) {
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//
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// If there is no ps2 keyboard detected for the 1st time, retry again.
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//
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Result = DetectPs2Keyboard ();
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}
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return Result;
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}
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/**
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Updates the ConIn variable with Ps2 Keyboard device path,
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if it doesn't already exists in ConIn and ConInDev.
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**/
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VOID
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AddPs2Keyboard (
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VOID
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)
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{
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SIO_PCI_ISA_BRIDGE_DEVICE_INFO *SioIsaInfo;
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DEBUG ((DEBUG_INFO, "[AddPs2Keyboard]\n"));
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SioIsaInfo = (SIO_PCI_ISA_BRIDGE_DEVICE_INFO*) FixedPcdGetPtr (PcdSuperIoPciIsaBridgeDevice);
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//
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// patch IsaBridge device and and function
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//
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gKeyboardDevicePath.IsaBridge.Device = SioIsaInfo->Device;
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gKeyboardDevicePath.IsaBridge.Function = SioIsaInfo->Funtion;
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//
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// Append Ps2 Keyboard into "ConIn"
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//
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EfiBootManagerUpdateConsoleVariable (ConIn, (EFI_DEVICE_PATH_PROTOCOL *) &gKeyboardDevicePath, NULL);
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//
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// Append Ps2 Keyboard into "ConInDev"
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//
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EfiBootManagerUpdateConsoleVariable (ConInDev, (EFI_DEVICE_PATH_PROTOCOL *) &gKeyboardDevicePath, NULL);
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}
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/**
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Constructor for the Ps2 keyboard controller library.
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@param ImageHandle the image handle of the process
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@param SystemTable the EFI System Table pointer
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@retval EFI_SUCCESS the shell command handlers were installed sucessfully
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@retval EFI_UNSUPPORTED the shell level required was not found.
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**/
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EFI_STATUS
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EFIAPI
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BdsPs2KbcLibConstructor (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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UINT8 Ps2KbMsEnable;
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Ps2KbMsEnable = PcdGet8 (PcdPs2KbMsEnable);
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if (Ps2KbMsEnable == 0x1
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&& IsPs2KeyboardConnected())
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{
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// add ps2 device path to ConIn and ConInDev
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AddPs2Keyboard ();
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}
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return EFI_SUCCESS;
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}
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