From patchwork Wed Apr 3 08:40:32 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Ji-Ze Hong (Peter Hong)" X-Patchwork-Id: 10883037 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6582E922 for ; Wed, 3 Apr 2019 08:40:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4F9C628989 for ; Wed, 3 Apr 2019 08:40:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 43AA4289A7; Wed, 3 Apr 2019 08:40:55 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DD71128989 for ; Wed, 3 Apr 2019 08:40:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729111AbfDCIkt (ORCPT ); Wed, 3 Apr 2019 04:40:49 -0400 Received: from mail-pl1-f196.google.com ([209.85.214.196]:33337 "EHLO mail-pl1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729084AbfDCIkm (ORCPT ); Wed, 3 Apr 2019 04:40:42 -0400 Received: by mail-pl1-f196.google.com with SMTP id t16so5798168plo.0; Wed, 03 Apr 2019 01:40:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=hlyKAeR1mEcrMfe+fwc6wsVdLhc2SdEq/zOCkkdLvP8=; b=oi5TmppckJJBLh5Y5SQjFrJl0OMNgTyVQ5klqlZ3Eqmn4518SQlbM2UgYLJrzDeLVW WvufHklUUCt1TV85IaITVsDBWsm7U30SS3utc3xwqPfVxtjjGBEs/0GSBbx8XFmfK/np jxh/+LOJWE99g69ruLuQB/oTwRmSXjDNAuXsJix5c18iki9T5rALl7BSZjcxgZEooeWf udXdnfz1KgzfXz6C1YMTHalnKAkwvUvmqFOqN9MsnQd35RDWOLxCmeH9gPWmlH2R1FVM gGqGxwLuRBXvKmw/q3SGExpbjMC/T4qiAENHcxmW+IJzE8avSVxwUdr5l7hp6DKcze4v Gc2A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=hlyKAeR1mEcrMfe+fwc6wsVdLhc2SdEq/zOCkkdLvP8=; b=AbD5wKV+aiF830hyLZW24s36Om0No267ucgmAGjmqJRZVsAGLevUu/5BpOoyBzVSwF tBY8p6mFFY4ubW8TqWQ6aSByALAZTsNNlfoBtRRzsjQjMSbbkm6enerC9cTBZv4CO//c 94+LFuoCb4LP7E2Dgu+KYpi4v3D31NMgAI/ZPpuOv0JepCSEPH3/PB+4anMxaUZD9Avd xGkDF31ficIvMwYOaPVVNYRGSf1jyijnTBWqfTXfc/T/ZwNc8Oxgf1ntaSJyWy3kq33k mRJQzm4HjjchclCtuAS7QUIiM/OoZGY+/i1VL1+PdbOETFQpFlixm+dXn1CidJe8Ak0c uCjA== X-Gm-Message-State: APjAAAXQyeiB1z+nr3Bc1RsnIbQjJsdpLWzfTRqM8kSlchHdJB85kJEp Phs2m1Y++m0HmfQ8y/AOnnk= X-Google-Smtp-Source: APXvYqx3RWB9Hd+qlo/thlRSj3MjABovFTI+PhkoFof78R36MpqObFNs/xKOCcMeGHv9uKSV34fvgw== X-Received: by 2002:a17:902:380c:: with SMTP id l12mr75538400plc.238.1554280841622; Wed, 03 Apr 2019 01:40:41 -0700 (PDT) Received: from localhost (59-120-186-245.HINET-IP.hinet.net. [59.120.186.245]) by smtp.gmail.com with ESMTPSA id z8sm20389082pgz.3.2019.04.03.01.40.40 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 03 Apr 2019 01:40:41 -0700 (PDT) From: "Ji-Ze Hong (Peter Hong)" X-Google-Original-From: "Ji-Ze Hong (Peter Hong)" To: peter_hong@fintek.com.tw, johan@kernel.org, gregkh@linuxfoundation.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, "Ji-Ze Hong (Peter Hong)" Subject: [PATCH V6 3/3] USB: serial: f81232: implement break control Date: Wed, 3 Apr 2019 16:40:32 +0800 Message-Id: <1554280832-29286-3-git-send-email-hpeter+linux_kernel@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1554280832-29286-1-git-send-email-hpeter+linux_kernel@gmail.com> References: <1554280832-29286-1-git-send-email-hpeter+linux_kernel@gmail.com> Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Implement Fintek F81232 break on/off with LCR register. It's the same with 16550A LCR register layout. Signed-off-by: Ji-Ze Hong (Peter Hong) --- v6: 1: no change v5: 1: no change v4: 1: no change v3: 1: using shadow_lcr to save LCR in f81232_break_ctl() drivers/usb/serial/f81232.c | 29 +++++++++++++++++++++++------ 1 file changed, 23 insertions(+), 6 deletions(-) diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c index 2c0c904dbc33..f60f636c927a 100644 --- a/drivers/usb/serial/f81232.c +++ b/drivers/usb/serial/f81232.c @@ -65,6 +65,7 @@ struct f81232_private { struct mutex lock; u8 modem_control; u8 modem_status; + u8 shadow_lcr; bool deferred_lsr_work_needed; speed_t baud_base; struct work_struct lsr_work; @@ -384,13 +385,23 @@ static void f81232_process_read_urb(struct urb *urb) static void f81232_break_ctl(struct tty_struct *tty, int break_state) { - /* FIXME - Stubbed out for now */ + struct usb_serial_port *port = tty->driver_data; + struct f81232_private *priv = usb_get_serial_port_data(port); + int status; - /* - * break_state = -1 to turn on break, and 0 to turn off break - * see drivers/char/tty_io.c to see it used. - * last_set_data_urb_value NEVER has the break bit set in it. - */ + mutex_lock(&priv->lock); + + if (break_state) + priv->shadow_lcr |= UART_LCR_SBC; + else + priv->shadow_lcr &= ~UART_LCR_SBC; + + status = f81232_set_register(port, LINE_CONTROL_REGISTER, + priv->shadow_lcr); + if (status) + dev_err(&port->dev, "set break failed: %d\n", status); + + mutex_unlock(&priv->lock); } static int f81232_find_clk(speed_t baudrate) @@ -526,6 +537,7 @@ static int f81232_port_disable(struct usb_serial_port *port) static void f81232_set_termios(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios) { + struct f81232_private *priv = usb_get_serial_port_data(port); u8 new_lcr = 0; int status = 0; speed_t baudrate; @@ -579,11 +591,16 @@ static void f81232_set_termios(struct tty_struct *tty, break; } + mutex_lock(&priv->lock); + + new_lcr |= (priv->shadow_lcr & UART_LCR_SBC); status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr); if (status) { dev_err(&port->dev, "%s failed to set LCR: %d\n", __func__, status); } + + mutex_unlock(&priv->lock); } static int f81232_tiocmget(struct tty_struct *tty)