/*
   * Copyright (c) 2013 Google, Inc
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include "linux/crc8.h"
  
  unsigned int crc8(const unsigned char *vptr, int len)
  {
  	const unsigned char *data = vptr;
  	unsigned int crc = 0;
  	int i, j;
  
  	for (j = len; j; j--, data++) {
  		crc ^= (*data << 8);
  		for (i = 8; i; i--) {
  			if (crc & 0x8000)
  				crc ^= (0x1070 << 3);
  			crc <<= 1;
  		}
  	}
  
  	return (crc >> 8) & 0xff;
  }