moonjuice/kernel_arpi
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

can: dev: move length related code into seperate file

Browse Source 
This patch moves all CAN frame length related code of the CAN device
infrastructure into a separate file.

Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://lore.kernel.org/r/20210111141930.693847-5-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde
2021-01-11 15:19:19 +01:00
parent 5a9d5ecd69
commit bdd2e41319
6 changed files with 89 additions and 73 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
include/linux/can/length.h Normal file
View File

@@ -0,0 +1,48 @@
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2020 Oliver Hartkopp <socketcan@hartkopp.net>
*/
#ifndef _CAN_LENGTH_H
#define _CAN_LENGTH_H
/*
* can_cc_dlc2len(value) - convert a given data length code (dlc) of a
* Classical CAN frame into a valid data length of max. 8 bytes.
*
* To be used in the CAN netdriver receive path to ensure conformance with
* ISO 11898-1 Chapter 8.4.2.3 (DLC field)
*/
#define can_cc_dlc2len(dlc) (min_t(u8, (dlc), CAN_MAX_DLEN))
/* helper to get the data length code (DLC) for Classical CAN raw DLC access */
static inline u8 can_get_cc_dlc(const struct can_frame *cf, const u32 ctrlmode)
{
/* return len8_dlc as dlc value only if all conditions apply */
if ((ctrlmode & CAN_CTRLMODE_CC_LEN8_DLC) &&
(cf->len == CAN_MAX_DLEN) &&
(cf->len8_dlc > CAN_MAX_DLEN && cf->len8_dlc <= CAN_MAX_RAW_DLC))
return cf->len8_dlc;
/* return the payload length as dlc value */
return cf->len;
}
/* helper to set len and len8_dlc value for Classical CAN raw DLC access */
static inline void can_frame_set_cc_len(struct can_frame *cf, const u8 dlc,
const u32 ctrlmode)
{
/* the caller already ensured that dlc is a value from 0 .. 15 */
if (ctrlmode & CAN_CTRLMODE_CC_LEN8_DLC && dlc > CAN_MAX_DLEN)
cf->len8_dlc = dlc;
/* limit the payload length 'len' to CAN_MAX_DLEN */
cf->len = can_cc_dlc2len(dlc);
}
/* get data length from raw data length code (DLC) */
u8 can_fd_dlc2len(u8 dlc);
/* map the sanitized data length to an appropriate data length code */
u8 can_fd_len2dlc(u8 len);
#endif /* !_CAN_LENGTH_H */