1 files changed, 106 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/uthex.c b/drivers/acpi/acpica/uthex.c
new file mode 100644
index 000000000..0e02f1251
--- /dev/null
+++ b/drivers/acpi/acpica/uthex.c
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: uthex -- Hex/ASCII support functions
+ *
+ * Copyright (C) 2000 - 2020, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+
+#define _COMPONENT          ACPI_COMPILER
+ACPI_MODULE_NAME("uthex")
+
+/* Hex to ASCII conversion table */
+static const char acpi_gbl_hex_to_ascii[] = {
+	'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
+	    'E', 'F'
+};
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_hex_to_ascii_char
+ *
+ * PARAMETERS:  integer             - Contains the hex digit
+ *              position            - bit position of the digit within the
+ *                                    integer (multiple of 4)
+ *
+ * RETURN:      The converted Ascii character
+ *
+ * DESCRIPTION: Convert a hex digit to an Ascii character
+ *
+ ******************************************************************************/
+
+char acpi_ut_hex_to_ascii_char(u64 integer, u32 position)
+{
+	u64 index;
+
+	acpi_ut_short_shift_right(integer, position, &index);
+	return (acpi_gbl_hex_to_ascii[index & 0xF]);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_ascii_to_hex_byte
+ *
+ * PARAMETERS:  two_ascii_chars             - Pointer to two ASCII characters
+ *              return_byte                 - Where converted byte is returned
+ *
+ * RETURN:      Status and converted hex byte
+ *
+ * DESCRIPTION: Perform ascii-to-hex translation, exactly two ASCII characters
+ *              to a single converted byte value.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_ascii_to_hex_byte(char *two_ascii_chars, u8 *return_byte)
+{
+
+	/* Both ASCII characters must be valid hex digits */
+
+	if (!isxdigit((int)two_ascii_chars[0]) ||
+	    !isxdigit((int)two_ascii_chars[1])) {
+		return (AE_BAD_HEX_CONSTANT);
+	}
+
+	*return_byte =
+	    acpi_ut_ascii_char_to_hex(two_ascii_chars[1]) |
+	    (acpi_ut_ascii_char_to_hex(two_ascii_chars[0]) << 4);
+
+	return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_ascii_char_to_hex
+ *
+ * PARAMETERS:  hex_char                - Hex character in Ascii. Must be:
+ *                                        0-9 or A-F or a-f
+ *
+ * RETURN:      The binary value of the ascii/hex character
+ *
+ * DESCRIPTION: Perform ascii-to-hex translation
+ *
+ ******************************************************************************/
+
+u8 acpi_ut_ascii_char_to_hex(int hex_char)
+{
+
+	/* Values 0-9 */
+
+	if (hex_char <= '9') {
+		return ((u8)(hex_char - '0'));
+	}
+
+	/* Upper case A-F */
+
+	if (hex_char <= 'F') {
+		return ((u8)(hex_char - 0x37));
+	}
+
+	/* Lower case a-f */
+
+	return ((u8)(hex_char - 0x57));
+}