netdev - [PATCH net-next 29/29] can: error: add definitions for the different CAN error thresholds

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Date:   Wed, 20 Jul 2022 10:10:34 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
        kernel@...gutronix.de,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 29/29] can: error: add definitions for the different CAN error thresholds

From: Vincent Mailhol <mailhol.vincent@...adoo.fr>

Currently, drivers are using magic numbers to derive the CAN error
states from the error counter. Add three macro declarations to
remediate this.

For reference, the error-active, error-passive and bus-off are defined
in ISO 11898, section 12.1.4.2 "Error counting". Although ISO 11898
does not define error-warning state, this extra value is also commonly
used and is thus also added.

Link: https://lore.kernel.org/all/20220719143550.3681-13-mailhol.vincent@wanadoo.fr
Signed-off-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 include/uapi/linux/can/error.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/uapi/linux/can/error.h b/include/uapi/linux/can/error.h
index b7c3efd9ff99..acc1ac393d2a 100644
--- a/include/uapi/linux/can/error.h
+++ b/include/uapi/linux/can/error.h
@@ -127,4 +127,17 @@
 /* TX error counter / data[6] */
 /* RX error counter / data[7] */
 
+/* CAN state thresholds
+ *
+ * Error counter	Error state
+ * -----------------------------------
+ * 0 -  95		Error-active
+ * 96 - 127		Error-warning
+ * 128 - 255		Error-passive
+ * 256 and greater	Bus-off
+ */
+#define CAN_ERROR_WARNING_THRESHOLD 96
+#define CAN_ERROR_PASSIVE_THRESHOLD 128
+#define CAN_BUS_OFF_THRESHOLD 256
+
 #endif /* _UAPI_CAN_ERROR_H */
-- 
2.35.1