18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0-only 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * crc16.c 48c2ecf20Sopenharmony_ci */ 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_ci#include <linux/types.h> 78c2ecf20Sopenharmony_ci#include <linux/module.h> 88c2ecf20Sopenharmony_ci#include <linux/crc16.h> 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ci/** CRC table for the CRC-16. The poly is 0x8005 (x^16 + x^15 + x^2 + 1) */ 118c2ecf20Sopenharmony_ciu16 const crc16_table[256] = { 128c2ecf20Sopenharmony_ci 0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241, 138c2ecf20Sopenharmony_ci 0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440, 148c2ecf20Sopenharmony_ci 0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40, 158c2ecf20Sopenharmony_ci 0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841, 168c2ecf20Sopenharmony_ci 0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40, 178c2ecf20Sopenharmony_ci 0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41, 188c2ecf20Sopenharmony_ci 0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641, 198c2ecf20Sopenharmony_ci 0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040, 208c2ecf20Sopenharmony_ci 0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240, 218c2ecf20Sopenharmony_ci 0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441, 228c2ecf20Sopenharmony_ci 0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41, 238c2ecf20Sopenharmony_ci 0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840, 248c2ecf20Sopenharmony_ci 0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41, 258c2ecf20Sopenharmony_ci 0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40, 268c2ecf20Sopenharmony_ci 0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640, 278c2ecf20Sopenharmony_ci 0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041, 288c2ecf20Sopenharmony_ci 0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240, 298c2ecf20Sopenharmony_ci 0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441, 308c2ecf20Sopenharmony_ci 0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41, 318c2ecf20Sopenharmony_ci 0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840, 328c2ecf20Sopenharmony_ci 0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41, 338c2ecf20Sopenharmony_ci 0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40, 348c2ecf20Sopenharmony_ci 0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640, 358c2ecf20Sopenharmony_ci 0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041, 368c2ecf20Sopenharmony_ci 0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241, 378c2ecf20Sopenharmony_ci 0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440, 388c2ecf20Sopenharmony_ci 0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40, 398c2ecf20Sopenharmony_ci 0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841, 408c2ecf20Sopenharmony_ci 0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40, 418c2ecf20Sopenharmony_ci 0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41, 428c2ecf20Sopenharmony_ci 0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641, 438c2ecf20Sopenharmony_ci 0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040 448c2ecf20Sopenharmony_ci}; 458c2ecf20Sopenharmony_ciEXPORT_SYMBOL(crc16_table); 468c2ecf20Sopenharmony_ci 478c2ecf20Sopenharmony_ci/** 488c2ecf20Sopenharmony_ci * crc16 - compute the CRC-16 for the data buffer 498c2ecf20Sopenharmony_ci * @crc: previous CRC value 508c2ecf20Sopenharmony_ci * @buffer: data pointer 518c2ecf20Sopenharmony_ci * @len: number of bytes in the buffer 528c2ecf20Sopenharmony_ci * 538c2ecf20Sopenharmony_ci * Returns the updated CRC value. 548c2ecf20Sopenharmony_ci */ 558c2ecf20Sopenharmony_ciu16 crc16(u16 crc, u8 const *buffer, size_t len) 568c2ecf20Sopenharmony_ci{ 578c2ecf20Sopenharmony_ci while (len--) 588c2ecf20Sopenharmony_ci crc = crc16_byte(crc, *buffer++); 598c2ecf20Sopenharmony_ci return crc; 608c2ecf20Sopenharmony_ci} 618c2ecf20Sopenharmony_ciEXPORT_SYMBOL(crc16); 628c2ecf20Sopenharmony_ci 638c2ecf20Sopenharmony_ciMODULE_DESCRIPTION("CRC16 calculations"); 648c2ecf20Sopenharmony_ciMODULE_LICENSE("GPL"); 658c2ecf20Sopenharmony_ci 66