remove unnecessary check for NULL pointer.

[mirror_edk2.git] / EdkUnixPkg / Dxe / UnixThunk / Bus / Uga / UnixUgaInput.c

/*++\r
\r
Copyright (c) 2006, Intel Corporation\r
All rights reserved. This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution.  The full text of the license may be found at\r
http://opensource.org/licenses/bsd-license.php\r
\r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
Module Name:\r
\r
  UnixUgaInput.c\r
\r
Abstract:\r
\r
  This file produces the Simple Text In for an Uga window.\r
\r
  This stuff is linked at the hip to the Window, since the window\r
  processing is done in a thread kicked off in UnixUgaImplementation.c\r
\r
  Since the window information is processed in an other thread we need\r
  a keyboard Queue to pass data about. The Simple Text In code just\r
  takes data off the Queue. The WinProc message loop takes keyboard input\r
  and places it in the Queue.\r
\r
--*/\r
\r
#include "UnixUga.h"\r
\r
//\r
// Simple Text In implementation.\r
//\r
\r
EFI_STATUS\r
EFIAPI\r
UnixUgaSimpleTextInReset (\r
  IN EFI_SIMPLE_TEXT_IN_PROTOCOL          *This,\r
  IN BOOLEAN                              ExtendedVerification\r
  )\r
/*++\r
\r
Routine Description:\r
\r
  TODO: Add function description\r
\r
Arguments:\r
\r
  This                  - TODO: add argument description\r
  ExtendedVerification  - TODO: add argument description\r
\r
Returns:\r
\r
  EFI_SUCCESS - TODO: Add description for return value\r
\r
--*/\r
{\r
  UGA_PRIVATE_DATA  *Private;\r
  EFI_INPUT_KEY     Key;\r
  EFI_TPL           OldTpl;\r
\r
  Private = UGA_PRIVATE_DATA_FROM_TEXT_IN_THIS (This);\r
  if (Private->UgaIo == NULL) {
    return EFI_SUCCESS;\r
  }
\r
  //\r
  // Enter critical section\r
  //\r
  OldTpl = gBS->RaiseTPL (TPL_NOTIFY);\r
\r
  //\r
  // A reset is draining the Queue\r
  //\r
  while (Private->UgaIo->UgaGetKey(Private->UgaIo, &Key) == EFI_SUCCESS)\r
    ;\r
\r
  //\r
  // Leave critical section and return\r
  //\r
  gBS->RestoreTPL (OldTpl);\r
  return EFI_SUCCESS;\r
}\r
\r
STATIC\r
EFI_STATUS\r
EFIAPI\r
UnixUgaSimpleTextInReadKeyStroke (\r
  IN EFI_SIMPLE_TEXT_IN_PROTOCOL          *This,\r
  OUT EFI_INPUT_KEY                       *Key\r
  )\r
/*++\r
\r
Routine Description:\r
\r
  TODO: Add function description\r
\r
Arguments:\r
\r
  This  - TODO: add argument description\r
  Key   - TODO: add argument description\r
\r
Returns:\r
\r
  TODO: add return values\r
\r
--*/\r
{\r
  UGA_PRIVATE_DATA  *Private;\r
  EFI_STATUS        Status;\r
  EFI_TPL           OldTpl;\r
\r
  Private = UGA_PRIVATE_DATA_FROM_TEXT_IN_THIS (This);\r
  if (Private->UgaIo == NULL) {
    return EFI_NOT_READY;\r
  }
\r
  //\r
  // Enter critical section\r
  //\r
  OldTpl  = gBS->RaiseTPL (TPL_NOTIFY);\r
\r
  Status  = Private->UgaIo->UgaGetKey(Private->UgaIo, Key);
  //\r
  // Leave critical section and return\r
  //\r
  gBS->RestoreTPL (OldTpl);\r
\r
  return Status;\r
}\r
\r
STATIC\r
VOID\r
EFIAPI\r
UnixUgaSimpleTextInWaitForKey (\r
  IN EFI_EVENT          Event,\r
  IN VOID               *Context\r
  )\r
/*++\r
\r
Routine Description:\r
\r
  TODO: Add function description\r
\r
Arguments:\r
\r
  Event   - TODO: add argument description\r
  Context - TODO: add argument description\r
\r
Returns:\r
\r
  TODO: add return values\r
\r
--*/\r
{\r
  UGA_PRIVATE_DATA  *Private;\r
  EFI_STATUS        Status;\r
  EFI_TPL           OldTpl;\r
\r
  Private = (UGA_PRIVATE_DATA *) Context;\r
  if (Private->UgaIo == NULL) {
    return;
  }
\r
  //\r
  // Enter critical section\r
  //\r
  OldTpl  = gBS->RaiseTPL (TPL_NOTIFY);\r
\r
  Status  = Private->UgaIo->UgaCheckKey(Private->UgaIo);
  if (!EFI_ERROR (Status)) {\r
    //\r
    // If a there is a key in the queue signal our event.\r
    //\r
    gBS->SignalEvent (Event);\r
  }
  //\r
  // Leave critical section and return\r
  //\r
  gBS->RestoreTPL (OldTpl);\r
}\r
\r
EFI_STATUS\r
UnixUgaInitializeSimpleTextInForWindow (\r
  IN  UGA_PRIVATE_DATA    *Private\r
  )\r
/*++\r
\r
Routine Description:\r
\r
  TODO: Add function description\r
\r
Arguments:\r
\r
  Private - TODO: add argument description\r
\r
Returns:\r
\r
  TODO: add return values\r
\r
--*/\r
{\r
  EFI_STATUS  Status;\r
\r
  //\r
  // Initialize Simple Text In protoocol\r
  //\r
  Private->SimpleTextIn.Reset         = UnixUgaSimpleTextInReset;\r
  Private->SimpleTextIn.ReadKeyStroke = UnixUgaSimpleTextInReadKeyStroke;\r
\r
  Status = gBS->CreateEvent (\r
                  EVT_NOTIFY_WAIT,\r
                  TPL_NOTIFY,\r
                  UnixUgaSimpleTextInWaitForKey,\r
                  Private,\r
                  &Private->SimpleTextIn.WaitForKey\r
                  );\r
\r
  return Status;\r
}\r