From patchwork Mon Dec 10 16:30:19 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 10721711 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 54F7491E for ; Mon, 10 Dec 2018 16:31:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 417C32AE6B for ; Mon, 10 Dec 2018 16:31:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 322362AE72; Mon, 10 Dec 2018 16:31:31 +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=-7.9 required=2.0 tests=BAYES_00,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 BA2402AE6B for ; Mon, 10 Dec 2018 16:31:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728377AbeLJQbW (ORCPT ); Mon, 10 Dec 2018 11:31:22 -0500 Received: from mx2.suse.de ([195.135.220.15]:45610 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728314AbeLJQbW (ORCPT ); Mon, 10 Dec 2018 11:31:22 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay1.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 56441AFAF; Mon, 10 Dec 2018 16:31:20 +0000 (UTC) From: Nicolas Saenz Julienne To: linux-input@vger.kernel.org Cc: linux-rpi-kernel@lists.infradead.org, stefan.wahren@i2se.com, eric@anholt.net, agraf@suse.de, Nicolas Saenz Julienne , Dmitry Torokhov , Rob Herring , Mark Jonas , Hans-Christian Noren Egtvedt , Zhu Yi , Masanari Iida , Corentin Labbe , Eugen Hristev , Hans de Goede , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 0/2] input: driver for RPi's official 7" touchscreen Date: Mon, 10 Dec 2018 17:30:19 +0100 Message-Id: <20181210163036.24813-1-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.19.2 MIME-Version: 1.0 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This small series adds support for Raspberry pi's 7" touchscreen. Which alongside with the backlight driver are the last devices needed to have a functional touchscreen upstream. With this setup the board's VC4 firmware takes care of communicating with the touch chip and provides data though a shared memory area provided by the driver. The driver takes care of polling the firmware whenever at around 60Hz since there is no interrupt line available. The 1.0 revision of the touchscreen is based on the ft5426 chip. Technically, with some changes in edt-ft54x4.c we should be able to access the data directly through I2C. Yet this bus is meant to be owned by RPi's firmware and might access it anytime. For example, to configure RPi's camera device. As sharing the bus master interface is not possible a series of alternatives have been tested unsuccessfully [1]. It seems that we'll be unable to access the chip directly in a "clean" way which leaves us with this firmware based solution. The driver was rewritten based on the one available on the downstream Raspberry Pi kernel tree: https://github.com/raspberrypi/linux/. This series is based on v4.20-rc6 and was tested on a RPi 3 B+. Changelog RFC -> PATCH: - Better dependencies check in Kconfig - Add SPDX tag - Use polled input device API - Use input_mt_sync_frame() - Drop reference from dt node in probe - Use devm where possible - Small cosmetic changes [1] https://lists.infradead.org/pipermail/linux-rpi-kernel/2018-December/008444.html === Nicolas Saenz Julienne (2): input: add official Raspberry Pi's touchscreen driver Input: raspberrypi-ts - add devicetree binding documentation .../touchscreen/raspberrypi,firmware-ts.txt | 26 ++ drivers/input/touchscreen/Kconfig | 12 + drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/raspberrypi-ts.c | 223 ++++++++++++++++++ 4 files changed, 262 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/raspberrypi,firmware-ts.txt create mode 100644 drivers/input/touchscreen/raspberrypi-ts.c