v4.19.13 snapshot.
diff --git a/drivers/acpi/acpica/utascii.c b/drivers/acpi/acpica/utascii.c
new file mode 100644
index 0000000..04ff61e
--- /dev/null
+++ b/drivers/acpi/acpica/utascii.c
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: utascii - Utility ascii functions
+ *
+ * Copyright (C) 2000 - 2018, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_valid_nameseg
+ *
+ * PARAMETERS: name - The name or table signature to be examined.
+ * Four characters, does not have to be a
+ * NULL terminated string.
+ *
+ * RETURN: TRUE if signature is has 4 valid ACPI characters
+ *
+ * DESCRIPTION: Validate an ACPI table signature.
+ *
+ ******************************************************************************/
+
+u8 acpi_ut_valid_nameseg(char *name)
+{
+ u32 i;
+
+ /* Validate each character in the signature */
+
+ for (i = 0; i < ACPI_NAME_SIZE; i++) {
+ if (!acpi_ut_valid_name_char(name[i], i)) {
+ return (FALSE);
+ }
+ }
+
+ return (TRUE);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_valid_name_char
+ *
+ * PARAMETERS: char - The character to be examined
+ * position - Byte position (0-3)
+ *
+ * RETURN: TRUE if the character is valid, FALSE otherwise
+ *
+ * DESCRIPTION: Check for a valid ACPI character. Must be one of:
+ * 1) Upper case alpha
+ * 2) numeric
+ * 3) underscore
+ *
+ * We allow a '!' as the last character because of the ASF! table
+ *
+ ******************************************************************************/
+
+u8 acpi_ut_valid_name_char(char character, u32 position)
+{
+
+ if (!((character >= 'A' && character <= 'Z') ||
+ (character >= '0' && character <= '9') || (character == '_'))) {
+
+ /* Allow a '!' in the last position */
+
+ if (character == '!' && position == 3) {
+ return (TRUE);
+ }
+
+ return (FALSE);
+ }
+
+ return (TRUE);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_check_and_repair_ascii
+ *
+ * PARAMETERS: name - Ascii string
+ * count - Number of characters to check
+ *
+ * RETURN: None
+ *
+ * DESCRIPTION: Ensure that the requested number of characters are printable
+ * Ascii characters. Sets non-printable and null chars to <space>.
+ *
+ ******************************************************************************/
+
+void acpi_ut_check_and_repair_ascii(u8 *name, char *repaired_name, u32 count)
+{
+ u32 i;
+
+ for (i = 0; i < count; i++) {
+ repaired_name[i] = (char)name[i];
+
+ if (!name[i]) {
+ return;
+ }
+ if (!isprint(name[i])) {
+ repaired_name[i] = ' ';
+ }
+ }
+}