1 files changed, 65 insertions, 0 deletions
diff --git a/ArmPlatformPkg/Library/LcdPlatformNullLib/LcdPlatformNullLib.c b/ArmPlatformPkg/Library/LcdPlatformNullLib/LcdPlatformNullLib.c
index b78d9a3bbd..b76894c534 100644
--- a/ArmPlatformPkg/Library/LcdPlatformNullLib/LcdPlatformNullLib.c
+++ b/ArmPlatformPkg/Library/LcdPlatformNullLib/LcdPlatformNullLib.c
@@ -1,6 +1,7 @@
 /** @file
 
   Copyright (c) 2017, Linaro, Ltd. All rights reserved.
+  Copyright (c) 2018, Arm Limited. All rights reserved.
 
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
@@ -17,6 +18,12 @@
 #include <Library/DebugLib.h>
 #include <Library/LcdPlatformLib.h>
 
+/** Platform related initialization function.
+
+  @param[in] Handle              Handle to the LCD device instance.
+
+  @retval EFI_UNSUPPORTED        Interface is not supported.
+**/
 EFI_STATUS
 LcdPlatformInitializeDisplay (
   IN EFI_HANDLE   Handle
@@ -26,6 +33,17 @@ LcdPlatformInitializeDisplay (
   return EFI_UNSUPPORTED;
 }
 
+/** Allocate VRAM memory in DRAM for the framebuffer
+  (unless it is reserved already).
+
+  The allocated address can be used to set the framebuffer.
+
+  @param[out] VramBaseAddress      A pointer to the framebuffer address.
+  @param[out] VramSize             A pointer to the size of the frame
+                                   buffer in bytes
+
+  @retval EFI_UNSUPPORTED          Interface is not supported.
+**/
 EFI_STATUS
 LcdPlatformGetVram (
   OUT EFI_PHYSICAL_ADDRESS*                 VramBaseAddress,
@@ -36,6 +54,14 @@ LcdPlatformGetVram (
   return EFI_UNSUPPORTED;
 }
 
+/** Return total number of modes supported.
+
+  Note: Valid mode numbers are 0 to MaxMode - 1
+  See Section 12.9 of the UEFI Specification 2.7
+
+  @retval UINT32             Zero number of modes supported
+                             in a NULL library implementation.
+**/
 UINT32
 LcdPlatformGetMaxMode (
   VOID
@@ -45,6 +71,12 @@ LcdPlatformGetMaxMode (
   return 0;
 }
 
+/** Set the requested display mode.
+
+  @param[in] ModeNumber            Mode Number.
+
+  @retval EFI_UNSUPPORTED          Interface is not supported.
+**/
 EFI_STATUS
 LcdPlatformSetMode (
   IN UINT32                                 ModeNumber
@@ -54,6 +86,15 @@ LcdPlatformSetMode (
   return EFI_UNSUPPORTED;
 }
 
+/** Return information for the requested mode number.
+
+  @param[in]  ModeNumber         Mode Number.
+  @param[out] Info               Pointer for returned mode information
+                                 (on success).
+
+  @retval EFI_UNSUPPORTED        Interface is not supported.
+
+**/
 EFI_STATUS
 LcdPlatformQueryMode (
   IN  UINT32                                ModeNumber,
@@ -64,6 +105,21 @@ LcdPlatformQueryMode (
   return EFI_UNSUPPORTED;
 }
 
+/** Return display timing information for the requested mode number.
+
+  @param[in]  ModeNumber          Mode Number.
+
+  @param[out] HRes                Pointer to horizontal resolution.
+  @param[out] HSync               Pointer to horizontal sync width.
+  @param[out] HBackPorch          Pointer to horizontal back porch.
+  @param[out] HFrontPorch         Pointer to horizontal front porch.
+  @param[out] VRes                Pointer to vertical resolution.
+  @param[out] VSync               Pointer to vertical sync width.
+  @param[out] VBackPorch          Pointer to vertical back porch.
+  @param[out] VFrontPorch         Pointer to vertical front porch.
+
+  @retval EFI_UNSUPPORTED         Interface is not supported.
+**/
 EFI_STATUS
 LcdPlatformGetTimings (
   IN  UINT32                              ModeNumber,
@@ -81,6 +137,15 @@ LcdPlatformGetTimings (
   return EFI_UNSUPPORTED;
 }
 
+/** Return bits per pixel information for a mode number.
+
+  @param[in]  ModeNumber          Mode Number.
+
+  @param[out] Bpp                 Pointer to value bits per pixel information.
+
+  @retval EFI_UNSUPPORTED         Interface is not supported.
+
+**/
 EFI_STATUS
 LcdPlatformGetBpp (
   IN  UINT32                                ModeNumber,