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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (C) 2012, 2020 Oliver Hartkopp <socketcan@hartkopp.net>
*/
#include <linux/can/dev.h>
/* CAN DLC to real data length conversion helpers */
static const u8 dlc2len[] = {
0, 1, 2, 3, 4, 5, 6, 7,
8, 12, 16, 20, 24, 32, 48, 64
};
/* get data length from raw data length code (DLC) */
u8 can_fd_dlc2len(u8 dlc)
{
return dlc2len[dlc & 0x0F];
}
EXPORT_SYMBOL_GPL(can_fd_dlc2len);
static const u8 len2dlc[] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, /* 0 - 8 */
9, 9, 9, 9, /* 9 - 12 */
10, 10, 10, 10, /* 13 - 16 */
11, 11, 11, 11, /* 17 - 20 */
12, 12, 12, 12, /* 21 - 24 */
13, 13, 13, 13, 13, 13, 13, 13, /* 25 - 32 */
14, 14, 14, 14, 14, 14, 14, 14, /* 33 - 40 */
14, 14, 14, 14, 14, 14, 14, 14, /* 41 - 48 */
};
/* map the sanitized data length to an appropriate data length code */
u8 can_fd_len2dlc(u8 len)
{
if (len >= ARRAY_SIZE(len2dlc))
return CANFD_MAX_DLC;
return len2dlc[len];
}
EXPORT_SYMBOL_GPL(can_fd_len2dlc);
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