can: kvaser_usb: Expose device information via devlink info_get()

Expose device information via devlink info_get():
  * Serial number
  * Firmware version
  * Hardware revision
  * EAN (product number)

Example output:
  $ devlink dev
  usb/1-1.2:1.0

  $ devlink dev info
  usb/1-1.2:1.0:
    driver kvaser_usb
    serial_number 1020
    versions:
        fixed:
          board.rev 1
          board.id 7330130009653
        running:
          fw 3.22.527

Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Jimmy Assarsson <extja@kvaser.com>
Link: https://patch.msgid.link/20250725123452.41-10-extja@kvaser.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Author: Jimmy Assarsson

drivers/net/can/usb/kvaser_usb/kvaser_usb_devlink.c

@@ -7,5 +7,56 @@
 
 #include <net/devlink.h>
 
+#define KVASER_USB_EAN_MSB 0x00073301
+
+static int kvaser_usb_devlink_info_get(struct devlink *devlink,
+				       struct devlink_info_req *req,
+				       struct netlink_ext_ack *extack)
+{
+	struct kvaser_usb *dev = devlink_priv(devlink);
+	char buf[] = "73301XXXXXXXXXX";
+	int ret;
+
+	if (dev->serial_number) {
+		snprintf(buf, sizeof(buf), "%u", dev->serial_number);
+		ret = devlink_info_serial_number_put(req, buf);
+		if (ret)
+			return ret;
+	}
+
+	if (dev->fw_version.major) {
+		snprintf(buf, sizeof(buf), "%u.%u.%u",
+			 dev->fw_version.major,
+			 dev->fw_version.minor,
+			 dev->fw_version.build);
+		ret = devlink_info_version_running_put(req,
+						       DEVLINK_INFO_VERSION_GENERIC_FW,
+						       buf);
+		if (ret)
+			return ret;
+	}
+
+	if (dev->hw_revision) {
+		snprintf(buf, sizeof(buf), "%u", dev->hw_revision);
+		ret = devlink_info_version_fixed_put(req,
+						     DEVLINK_INFO_VERSION_GENERIC_BOARD_REV,
+						     buf);
+		if (ret)
+			return ret;
+	}
+
+	if (dev->ean[1] == KVASER_USB_EAN_MSB) {
+		snprintf(buf, sizeof(buf), "%x%08x", dev->ean[1], dev->ean[0]);
+		ret = devlink_info_version_fixed_put(req,
+						     DEVLINK_INFO_VERSION_GENERIC_BOARD_ID,
+						     buf);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 const struct devlink_ops kvaser_usb_devlink_ops = {
+	.info_get = kvaser_usb_devlink_info_get,
 };