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 0A68CC433FE for ; Sun, 9 Jan 2022 12:01:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235421AbiAIMBN (ORCPT ); Sun, 9 Jan 2022 07:01:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47664 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233852AbiAIMBM (ORCPT ); Sun, 9 Jan 2022 07:01:12 -0500 Received: from mail-io1-xd2d.google.com (mail-io1-xd2d.google.com [IPv6:2607:f8b0:4864:20::d2d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9AA89C06173F; Sun, 9 Jan 2022 04:01:12 -0800 (PST) Received: by mail-io1-xd2d.google.com with SMTP id w22so3359555iov.3; Sun, 09 Jan 2022 04:01:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=spkLu4uIr0v4idqd3BcQfFaA/zlQoV1DfA8cSo6CIKU=; b=m8va4gCSJncMYbF5p4Ng95n4ZpMoZfJL1ws1RWZZA0DiCT6LWFpaLTpXCWSbNTpQkV ds/2kKAb2sB0sE9YSIZ8fliTk5xvsd3NaXnFpocQVSIZY/rfV5XdX+jygk8DnbAqzxQC eKTdQa8wJdIG1E3IUZuKa5o4EhSpmEKwYEVrL67uWmv3XssokJO9CCR0GMlKKZ6ATo3W oTkOsfTpSvwJwTaq4QChHt+1vFlvUIcJqefnPW2sH4eV2uCcQYZUyDML98j4Ki0f7dzO pi6owWZ+c2anwpYnahcp/T8xSTtJjmYTmZsEHH/EmSbQZjsty21UIiFuCX9TbOeVwmIh sInA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=spkLu4uIr0v4idqd3BcQfFaA/zlQoV1DfA8cSo6CIKU=; b=O3H3zgd5FOjqShKDfwXJ7qnSKWGCD2AKHFmoZNJXmOw8aaEBL/RHihb9OqS0BxW4WE DWyUQfBcx3CXE1kfoT6CUZytJQ51Q2UcTypdqDA0AGzp+92rnXyzQcKOHzeO91Nn3hCK 7lsWU19FMm2wti5Surtcrn01ovuLdIEXNCPYyoJ9cPHh7IS7nPf2fq5NJsOimD2b1E24 cTtaO23hJClPogmOw6nmCGFPlizQQVpQA6aAWjs4aMwx+B3kgtBVQl+E/CJ2sgHnp9SB SW+1aoASCIaww6/dzN1iO4JeyTjj+2MPsBSR54tg9SRW3LI9XCSZHMkXaGztyPV5+c7L uR9A== X-Gm-Message-State: AOAM531wX9F0DV0BF/KmrNm/xnaiP4xduIUzFOvE6rAIYNwHCzu2xRNW Es5Chv4dhJevv/dAwzud3qMuHDx2qJME2w37eeo= X-Google-Smtp-Source: ABdhPJy0DMSC8QDWbRPi8FsckA21vkZbQHA/1KkLQojh2VCkH7A6aNmT1QdcnBw+wmVV81jq64FSCwx2wxNozNHc1mo= X-Received: by 2002:a05:6638:204c:: with SMTP id t12mr32094554jaj.169.1641729671949; Sun, 09 Jan 2022 04:01:11 -0800 (PST) MIME-Version: 1.0 References: <20211222124603.326920-1-alistair@alistair23.me> <37291fe7-7028-cd9e-7fde-01d13f85f0d9@sholland.org> In-Reply-To: <37291fe7-7028-cd9e-7fde-01d13f85f0d9@sholland.org> From: Alistair Francis Date: Sun, 9 Jan 2022 22:00:45 +1000 Message-ID: Subject: Re: [PATCH v4 0/4] Add support for the Cypress cyttsp5 To: Samuel Holland Cc: Alistair Francis , devicetree , linux-arm-kernel , linux-input , Linux Kernel Mailing List , Benjamin Tissoires , Dmitry Torokhov , Rob Herring , Linus Walleij , Henrik Rydberg , Andreas Kemnade Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jan 7, 2022 at 3:49 PM Samuel Holland wrote: > > Hello! > > On 12/22/21 6:45 AM, Alistair Francis wrote: > > This patch series builds on top of [1] and adds support for the cyttsp5 > > touchscreen controller for the reMarkable 2. > > > > I first tried to add an I2C HID device. Although the cyttsp5 has some H= ID > > looking aspects it is not HID compatible. Just in trying to probe the d= evice > > I found: > > - The HID descriptor has extra padding > > - The HID descriptor sets the high bytes of the descriptor length > > - The HID descriptor has extra unrecognised tags > > - The HID reset command doesn't appear to work > > > > I don't think there is a way to use the I2C HID framework with the cytt= sp5. > > For anyone interested you can see the work here [2]. In that branch tho= ugh I > > can only obtain a HID descriptor, nothing else works without more core > > changes. > > > > So instead I rebased the series from [1]. Converted to the new yaml DTS > > documentation, added regulator support and fixed a x/y miscalculation b= ug. > > I am working on the PineNote, which also uses a cyttsp5 touchscreen. I at= tempted Hey! That's great! PineNote support would be awesome > to use the driver from this series, but I could not get it to work. I fou= nd that > the cyttsp5_sensing_conf_data was filled with all zeroes, so every touch = failed > the max_tch check. I noticed that cmd_done was being completed by empty > responses (which explains why the response buffer was zeroes), but I got = stuck > after that. Hmm... That's annoying. This series now works with the rM2 and a kobo device, so I don't understand why it wouldn't work on the PineNote. I just sent a v5 (sorry, I forgot to CC you) that has some code cleanups, but I don't expect it to fix the issues you are seeing. > > So I looked back at the thread you linked below, and tried to implement t= he > workarounds described there, and those above, plus some others, and I was= able > to get the touchscreen working with i2c_hid. Here are the changes I made = to i2c_hid: > https://github.com/smaeul/linux/commit/a1e07425a6c4 > > In summary: > - Perform a 2-byte dummy read before reading the HID descriptor. > This is required to clear the two-byte empty message. > - Split command/response into multiple I2C transactions. > This is probably some sort of timing issue. > Without these first two, HID descriptor reads return "02 00". > - Chop 2 bytes out of the HID descriptor, as per the thread below. > - Similarly, chop 3 bytes out of the report descriptor. > - Skip the reset command, as above. Otherwise, the touchscreen > sends a different, short, unusable (partial?) report descriptor. Cool! I'm impressed you got this working! > > I reused the the existing i2c_hid_of_goodix driver to handle toggling the= reset > line, which is required. That existing binding is almost identical to the= one in > this series. Here's the glue I added: > https://github.com/smaeul/linux/commit/65d9250d3899 > > And here is the result, from dmesg and debugfs: > https://gist.github.com/smaeul/60b4b0f784bfff8bb8ce3ee3b4483be9 > > So far, the quirks only appear to affect probing the device. The touchscr= een > works normally after that. If the PineNote and eInk setups are different (they probably are if this series isn't working for you) then there might be other changes as well. > > What do you think of this approach? It certainly seems cleaner than parsi= ng the > HID reports/responses by hand. But I don't know if all of the quirks are > acceptable for i2c_hid. I'll leave that for an I2C HID maintainer to answer. > > One additional quirk that I haven't handled yet is the missing min/max fo= r ABS_* > axes in the report descriptor. This prevents libinput from working, but o= ther > evdev users appear to work fine. The driver in this series appears to get= that > information from some vendor-specific command, and I am not sure where to= hook > that up. We will need that won't we? So then i2c_hid would have to implement that as well? Alistair > > Regards, > Samuel > > > 1: https://lwn.net/ml/linux-kernel/20180703094309.18514-1-mylene.josser= and@bootlin.com/ > > 2: https://github.com/alistair23/linux/commits/rM2-mainline-cyttsp5-hid > > > > Alistair Francis (2): > > ARM: imx_v6_v7_defconfig: Enable the cyttsp5 touchscreen > > ARM: dts: imx7d-remarkable2: Enable the cyttsp5 > > > > Myl=C3=A8ne Josserand (2): > > Input: Add driver for Cypress Generation 5 touchscreen > > dt-bindings: input: Add Cypress TT2100 touchscreen controller > > > > .../input/touchscreen/cypress,tt21000.yaml | 92 ++ > > arch/arm/boot/dts/imx7d-remarkable2.dts | 89 ++ > > arch/arm/configs/imx_v6_v7_defconfig | 1 + > > drivers/input/touchscreen/Kconfig | 14 + > > drivers/input/touchscreen/Makefile | 1 + > > drivers/input/touchscreen/cyttsp5.c | 922 ++++++++++++++++++ > > 6 files changed, 1119 insertions(+) > > create mode 100644 Documentation/devicetree/bindings/input/touchscreen= /cypress,tt21000.yaml > > create mode 100644 drivers/input/touchscreen/cyttsp5.c > > > 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6657BC433F5 for ; Sun, 9 Jan 2022 12:02:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:Subject:Message-ID:Date:From: In-Reply-To:References:MIME-Version:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=b9P1TCvHRphac9+FZPERPjtS/n3R6Wpj1zRNCev8rco=; b=TOy5pb/IDcNK5W 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