From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 25DF6C05027 for ; Fri, 3 Feb 2023 14:50:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231614AbjBCOuu (ORCPT ); Fri, 3 Feb 2023 09:50:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32868 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232611AbjBCOur (ORCPT ); Fri, 3 Feb 2023 09:50:47 -0500 Received: from mta-64-226.siemens.flowmailer.net (mta-64-226.siemens.flowmailer.net [185.136.64.226]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4DCC68F249 for ; Fri, 3 Feb 2023 06:50:44 -0800 (PST) Received: by mta-64-226.siemens.flowmailer.net with ESMTPSA id 20230203145042fe7659cbb89a805056 for ; Fri, 03 Feb 2023 15:50:43 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; s=fm1; d=siemens.com; i=daniel.starke@siemens.com; h=Date:From:Subject:To:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:Cc:References:In-Reply-To; bh=+nOvG2X3HLgF03w2fTPt3ooPfqHvAZ6ZsfqKleubf/o=; b=MSAb0QsdUJ/AWk9AaXt1zcoinF/++j29BUvdzRbtjI4GwNUBVaMDiNC1vBi1tNZuwvxgtH IqHAkhUURQjKAPPXif0ppEThsEQRbOfgUPadng0EwKW/sod2Jt+/PAkv5W7kFVndmfXoP44F 9hnGufJ2qIhBof5tihYoIIkLSUBNY=; From: "D. Starke" To: linux-serial@vger.kernel.org, gregkh@linuxfoundation.org, jirislaby@kernel.org, ilpo.jarvinen@linux.intel.com Cc: linux-kernel@vger.kernel.org, Daniel Starke Subject: [PATCH v3 3/4] tty: n_gsm: add RING/CD control support Date: Fri, 3 Feb 2023 15:50:22 +0100 Message-Id: <20230203145023.6012-3-daniel.starke@siemens.com> In-Reply-To: <20230203145023.6012-1-daniel.starke@siemens.com> References: <20230203145023.6012-1-daniel.starke@siemens.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Flowmailer-Platform: Siemens Feedback-ID: 519:519-314044:519-21489:flowmailer Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Daniel Starke The status lines ring and carrier detect are used by the modem to signal incoming calls (RING) or an established connection (CD). This is implemented as physical lines on a standard RS232 connection. However, the muxer protocol encodes these status lines as modem bits IC and DV. These incoming lines are masked by tty driver (see tty_io.c) and cannot be set by a user application. Allow setting RING via TIOCM_OUT1 and CD via TIOCM_OUT2 to allow implementation of a modem or modem emulator. Signed-off-by: Daniel Starke --- drivers/tty/n_gsm.c | 5 +++++ 1 file changed, 5 insertions(+) v2 -> v3: No changes. diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index d068df1cf2fd..cf1ab7d619d9 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -546,6 +546,11 @@ static u8 gsm_encode_modem(const struct gsm_dlci *dlci) modembits |= MDM_IC; if (dlci->modem_tx & TIOCM_CD || dlci->gsm->initiator) modembits |= MDM_DV; + /* special mappings for passive side to operate as UE */ + if (dlci->modem_tx & TIOCM_OUT1) + modembits |= MDM_IC; + if (dlci->modem_tx & TIOCM_OUT2) + modembits |= MDM_DV; return modembits; } -- 2.34.1