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From:   Frank Jungclaus <frank.jungclaus@esd.eu>
To:     linux-can@vger.kernel.org, Marc Kleine-Budde <mkl@pengutronix.de>,
        Wolfgang Grandegger <wg@grandegger.com>,
        Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Cc:     =?UTF-8?q?Stefan=20M=C3=A4tje?= <stefan.maetje@esd.eu>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Frank Jungclaus <frank.jungclaus@esd.eu>
Subject: [PATCH 6/6] can: esd_usb: Improved decoding for ESD_EV_CAN_ERROR_EXT messages
Date:   Fri,  8 Jul 2022 20:12:37 +0200
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As suggested by Vincent I spend a union plus a struct ev_can_err_ext
for easier decoding of an ESD_EV_CAN_ERROR_EXT event message (which
simply is a rx_msg with some dedicated data).

Signed-off-by: Frank Jungclaus <frank.jungclaus@esd.eu>
---
 drivers/net/can/usb/esd_usb.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/net/can/usb/esd_usb.c b/drivers/net/can/usb/esd_usb.c
index 09649a45d6ff..2b149590720c 100644
--- a/drivers/net/can/usb/esd_usb.c
+++ b/drivers/net/can/usb/esd_usb.c
@@ -126,7 +126,15 @@ struct rx_msg {
 	u8 dlc;
 	__le32 ts;
 	__le32 id; /* upper 3 bits contain flags */
-	u8 data[8];
+	union {
+		u8 data[8];
+		struct {
+			u8 status; /* CAN Controller Status */
+			u8 ecc;    /* Error Capture Register */
+			u8 rec;    /* RX Error Counter */
+			u8 tec;    /* TX Error Counter */
+		} ev_can_err_ext;  /* For ESD_EV_CAN_ERROR_EXT */
+	};
 };
 
 struct tx_msg {
@@ -134,7 +142,7 @@ struct tx_msg {
 	u8 cmd;
 	u8 net;
 	u8 dlc;
-	u32 hnd;	/* opaque handle, not used by device */
+	u32 hnd;   /* opaque handle, not used by device */
 	__le32 id; /* upper 3 bits contain flags */
 	u8 data[8];
 };
@@ -228,11 +236,11 @@ static void esd_usb_rx_event(struct esd_usb_net_priv *priv,
 	u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK;
 
 	if (id == ESD_EV_CAN_ERROR_EXT) {
-		u8 state = msg->msg.rx.data[0];
-		u8 ecc   = msg->msg.rx.data[1];
+		u8 state = msg->msg.rx.ev_can_err_ext.status;
+		u8 ecc   = msg->msg.rx.ev_can_err_ext.ecc;
 
-		priv->bec.rxerr = msg->msg.rx.data[2];
-		priv->bec.txerr = msg->msg.rx.data[3];
+		priv->bec.rxerr = msg->msg.rx.ev_can_err_ext.rec;
+		priv->bec.txerr = msg->msg.rx.ev_can_err_ext.tec;
 
 		netdev_dbg(priv->netdev,
 			   "CAN_ERR_EV_EXT: dlc=%#02x state=%02x ecc=%02x rec=%02x tec=%02x\n",
-- 
2.25.1