From patchwork Sun Nov 22 17:08:19 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 11923949 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0AE04C56201 for ; Sun, 22 Nov 2020 17:09:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B7FF820DD4 for ; Sun, 22 Nov 2020 17:08:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="YJm5CHvT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727940AbgKVRIi (ORCPT ); Sun, 22 Nov 2020 12:08:38 -0500 Received: from mail.kernel.org ([198.145.29.99]:58104 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727880AbgKVRIi (ORCPT ); Sun, 22 Nov 2020 12:08:38 -0500 Received: from localhost.localdomain (unknown [157.51.147.79]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 330AD20760; Sun, 22 Nov 2020 17:08:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1606064917; bh=6Kt7IBsktKXGsOCAQ+huvPZvZdPHOmlONpngR1NbzSk=; h=From:To:Cc:Subject:Date:From; b=YJm5CHvTrRn6sAjo2vtnZ87iCSK7f2XtgQkNC39z6EjC4HgOk1bZBkSIf4J9hGjS1 3dhQ1DATDjXXAaVDlTLIoP+PYox/xTqESTyPCuRzY8CaV70rGfEXALmAO/4pHwZK1y 7mgoJqbvIZxKvVIkrCJ1vXgdykSq+fyzfYQZ/two= From: Manivannan Sadhasivam To: johan@kernel.org, gregkh@linuxfoundation.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, patong.mxl@gmail.com, linus.walleij@linaro.org, mchehab+huawei@kernel.org, angelo.dureghello@timesys.com, Manivannan Sadhasivam Subject: [PATCH v5 0/3] Add support for MaxLinear/Exar USB to serial converters Date: Sun, 22 Nov 2020 22:38:19 +0530 Message-Id: <20201122170822.21715-1-mani@kernel.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Manivannan Sadhasivam Hello, This series adds support for MaxLinear/Exar USB to serial converters. This driver only supports XR21V141X series but it can easily be extended to other series in future. This driver is inspired from the initial one submitted by Patong Yang: https://lore.kernel.org/linux-usb/20180404070634.nhspvmxcjwfgjkcv@advantechmxl-desktop While the initial driver was a custom tty USB driver exposing whole new serial interface ttyXRUSBn, this version is completely based on USB serial core thus exposing the interfaces as ttyUSBn. This will avoid the overhead of exposing a new USB serial interface which the userspace tools are unaware of. This series has been tested with Hikey970 board hosting XR21V141X chip. NOTE: I've removed all reviews and tested-by tags as the code has gone through substantial rework. Greg, Linus, Mauro please consider reviewing again. Thanks, Mani Changes in v5: * Incorporated review comments from Johan. Noticeable ones are: - Made serial and gpiolib support exclusive and used mutex to avoid race. The gpio requests from gpiolib will be rejected when serial port is in use. - The driver only binds to data interface but claims both control and data interface. - Handled B0 request - Removed all reviews as the code has gone through substantial rework. Changes in v4: * Multiple improvements based on Johan's review. Noticeable ones are: - Now the driver claims both control and data interfaces but only registers tty device for data interface. - GPIO pin status is now shared between the console and gpiolib implementations. This is done to avoid changing the lines spuriously. - A separate port_open flag is added to reject GPIO requests while the tty port is open. - Removed padding PID to gpio device. * Added Greg and Mauro's review and tested tags. * Included a patch from Mauro to avoid the CDC-ACM driver to claim this device when this driver is built. Changes in v3: * Dropped the check for PID and also the reg_width property. Changes in v2: * Dropped the code related to handling variable register size. It's all u8 now. * Dropped the header file and moved the contents to driver itself. * Added Linus's reviewed-by tag for gpiochip patch. * Added PID to gpiochip label * Dropped gpiochip for interface 0 Manivannan Sadhasivam (2): usb: serial: Add MaxLinear/Exar USB to Serial driver usb: serial: xr_serial: Add gpiochip support Mauro Carvalho Chehab (1): usb: cdc-acm: Ignore Exar XR21V141X when serial driver is built drivers/usb/class/cdc-acm.c | 6 + drivers/usb/serial/Kconfig | 9 + drivers/usb/serial/Makefile | 1 + drivers/usb/serial/xr_serial.c | 854 +++++++++++++++++++++++++++++++++ 4 files changed, 870 insertions(+) create mode 100644 drivers/usb/serial/xr_serial.c