1 files changed, 26 insertions, 0 deletions
diff --git a/include/linux/crc-itu-t.h b/include/linux/crc-itu-t.h
new file mode 100644
index 000000000..2f991a427
--- /dev/null
+++ b/include/linux/crc-itu-t.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *	crc-itu-t.h - CRC ITU-T V.41 routine
+ *
+ * Implements the standard CRC ITU-T V.41:
+ *   Width 16
+ *   Poly  0x1021 (x^16 + x^12 + x^5 + 1)
+ *   Init  0
+ */
+
+#ifndef CRC_ITU_T_H
+#define CRC_ITU_T_H
+
+#include <linux/types.h>
+
+extern u16 const crc_itu_t_table[256];
+
+extern u16 crc_itu_t(u16 crc, const u8 *buffer, size_t len);
+
+static inline u16 crc_itu_t_byte(u16 crc, const u8 data)
+{
+	return (crc << 8) ^ crc_itu_t_table[((crc >> 8) ^ data) & 0xff];
+}
+
+#endif /* CRC_ITU_T_H */
+