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can.h: canxl: support Remote Request Substitution bit access 

The Remote Request Substitution bit is a dominant bit ("0") in the CAN XL
frame. As some CAN XL controllers support to access this bit a new
CANXL_RRS value has been defined for the canxl_frame.flags element.

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
pull/573/head
Oliver Hartkopp 2024-12-10 18:49:49 +01:00
parent df8e08fa70
commit 99c5c14790
1 changed files with 2 additions and 1 deletions
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3
include/linux/can.h
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@ -182,7 +182,7 @@ struct canfd_frame {
/* /*
* defined bits for canxl_frame.flags * defined bits for canxl_frame.flags
* *
* The canxl_frame.flags element contains two bits CANXL_XLF and CANXL_SEC * The canxl_frame.flags element contains three bits CANXL_[XLF|SEC|RRS]
* and shares the relative position of the struct can[fd]_frame.len element. * and shares the relative position of the struct can[fd]_frame.len element.
* The CANXL_XLF bit ALWAYS needs to be set to indicate a valid CAN XL frame. * The CANXL_XLF bit ALWAYS needs to be set to indicate a valid CAN XL frame.
* As a side effect setting this bit intentionally breaks the length checks * As a side effect setting this bit intentionally breaks the length checks
@ -192,6 +192,7 @@ struct canfd_frame {
*/ */
#define CANXL_XLF 0x80 /* mandatory CAN XL frame flag (must always be set!) */ #define CANXL_XLF 0x80 /* mandatory CAN XL frame flag (must always be set!) */
#define CANXL_SEC 0x01 /* Simple Extended Content (security/segmentation) */ #define CANXL_SEC 0x01 /* Simple Extended Content (security/segmentation) */
#define CANXL_RRS 0x02 /* Remote Request Substitution */
/* the 8-bit VCID is optionally placed in the canxl_frame.prio element */ /* the 8-bit VCID is optionally placed in the canxl_frame.prio element */
#define CANXL_VCID_OFFSET 16 /* bit offset of VCID in prio element */ #define CANXL_VCID_OFFSET 16 /* bit offset of VCID in prio element */