From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752678AbbKGKLN (ORCPT ); Sat, 7 Nov 2015 05:11:13 -0500 Received: from mail-lf0-f52.google.com ([209.85.215.52]:36093 "EHLO mail-lf0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751163AbbKGKKB (ORCPT ); Sat, 7 Nov 2015 05:10:01 -0500 From: "Matwey V. Kornilov" To: gregkh@linuxfoundation.org, jslaby@suse.com Cc: "Matwey V. Kornilov" , linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, matwey.kornilov@gmail.com Subject: [PATCH v2 2/3] tty: Implement default fallback serial8250_rs485_config Date: Sat, 7 Nov 2015 13:09:35 +0300 Message-Id: <1446890976-1817-2-git-send-email-matwey@sai.msu.ru> X-Mailer: git-send-email 2.6.2 In-Reply-To: <1446890976-1817-1-git-send-email-matwey@sai.msu.ru> References: <1446890976-1817-1-git-send-email-matwey@sai.msu.ru> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When 8250 driver doesn't have its own hardware RS485 support and doesn't want to override rs485_config callback, then default serial8250_rs485_config is used. It just stores supplied by user-space config. Signed-off-by: Matwey V. Kornilov --- drivers/tty/serial/8250/8250_core.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 3912646..8f292da 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -395,6 +395,12 @@ static void serial8250_release_rsa_resource(struct uart_8250_port *up) } } #endif +static int serial8250_rs485_config(struct uart_port *port, + struct serial_rs485 *rs485) +{ + port->rs485 = *rs485; + return 0; +} static const struct uart_ops *base_ops; static struct uart_ops univ8250_port_ops; @@ -990,6 +996,10 @@ int serial8250_register_8250_port(struct uart_8250_port *up) uart->port.rs485 = up->port.rs485; uart->dma = up->dma; + /* Use software RS485 support when hardware one is not available */ + if (!(uart->capabilities & UART_CAP_HW485) && !uart->port.rs485_config) + uart->port.rs485_config = serial8250_rs485_config; + /* Take tx_loadsz from fifosize if it wasn't set separately */ if (uart->port.fifosize && !uart->tx_loadsz) uart->tx_loadsz = uart->port.fifosize; -- 2.6.2