platform/chrome: cros_ec_proto: separate cros_ec_xfer_command()

cros_ec_send_command() has extra logic to handle EC_RES_IN_PROGRESS.
Separate the command transfer part into cros_ec_xfer_command() so
that other functions can re-use it.

Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20220718050914.2267370-6-tzungbi@kernel.org

Author: Tzung-Bi Shih

drivers/platform/chrome/cros_ec_proto.c

@@ -107,7 +107,7 @@ static int prepare_tx_legacy(struct cros_ec_device *ec_dev,
 	return EC_MSG_TX_PROTO_BYTES + msg->outsize;
 }
 
-static int cros_ec_send_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
+static int cros_ec_xfer_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
 {
 	int ret;
 	int (*xfer_fxn)(struct cros_ec_device *ec, struct cros_ec_command *msg);
@@ -123,14 +123,21 @@ static int cros_ec_send_command(struct cros_ec_device *ec_dev, struct cros_ec_co
 		 * the EC is trying to use protocol v2, on an underlying
 		 * communication mechanism that does not support v2.
 		 */
-		dev_err_once(ec_dev->dev,
-			     "missing EC transfer API, cannot send command\n");
+		dev_err_once(ec_dev->dev, "missing EC transfer API, cannot send command\n");
 		return -EIO;
 	}
 
 	trace_cros_ec_request_start(msg);
 	ret = (*xfer_fxn)(ec_dev, msg);
 	trace_cros_ec_request_done(msg, ret);
+
+	return ret;
+}
+
+static int cros_ec_send_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
+{
+	int ret = cros_ec_xfer_command(ec_dev, msg);
+
 	if (msg->result == EC_RES_IN_PROGRESS) {
 		int i;
 		struct cros_ec_command *status_msg;