linux/drivers/net/can/spi/mcp251xfd/mcp251xfd-crc16.c

// SPDX-License-Identifier: GPL-2.0
//
// mcp251xfd - Microchip MCP251xFD Family CAN controller driver
//
// Copyright (c) 2020 Pengutronix,
//                    Marc Kleine-Budde <[email protected]>
//
// Based on:
//
// CAN bus driver for Microchip 25XXFD CAN Controller with SPI Interface
//
// Copyright (c) 2019 Martin Sperl <[email protected]>
//

#include "mcp251xfd.h"

/* The standard crc16 in linux/crc16.h is unfortunately not computing
 * the correct results (left shift vs. right shift). So here an
 * implementation with a table generated with the help of:
 *
 * http://lkml.iu.edu/hypermail/linux/kernel/0508.1/1085.html
 */
static const u16 mcp251xfd_crc16_table[] = …;

static inline u16 mcp251xfd_crc16_byte(u16 crc, const u8 data)
{ … }

static u16 mcp251xfd_crc16(u16 crc, u8 const *buffer, size_t len)
{ … }

u16 mcp251xfd_crc16_compute(const void *data, size_t data_size)
{ … }

u16 mcp251xfd_crc16_compute2(const void *cmd, size_t cmd_size,
			     const void *data, size_t data_size)
{ … }