linux-kernel - Re: [PATCH v5 3/3] Input: Add TouchNetix axiom i2c touchscreen driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Wed, 31 Jan 2024 11:57:43 -0800
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Kamel Bouhara <kamel.bouhara@...tlin.com>
Cc: Jeff LaBundy <jeff@...undy.com>, Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Henrik Rydberg <rydberg@...math.org>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Marco Felsch <m.felsch@...gutronix.de>,
	catalin.popescu@...ca-geosystems.com,
	mark.satterthwaite@...chnetix.com, bartp@...sheep.co.uk,
	hannah.rossiter@...chnetix.com,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Gregory Clement <gregory.clement@...tlin.com>,
	bsp-development.geo@...ca-geosystems.com
Subject: Re: [PATCH v5 3/3] Input: Add TouchNetix axiom i2c touchscreen driver

On Wed, Jan 31, 2024 at 06:14:41PM +0100, Kamel Bouhara wrote:
> On Thu, Dec 28, 2023 at 09:44:31PM -0600, Jeff LaBundy wrote:

[...]

> > > +	case AXIOM_TARGET_STATE_HOVER:
> > > +	case AXIOM_TARGET_STATE_TOUCHING:
> > > +		target_prev_state->insert = true;
> > > +		update = true;
> > > +		input_mt_slot(input_dev, slot);
> > > +		input_report_abs(input_dev, ABS_MT_TRACKING_ID, slot);
> > > +		input_report_abs(input_dev, ABS_MT_POSITION_X, target->x);
> > > +		input_report_abs(input_dev, ABS_X, target->x);
> >
> > You do not need to explicitly report ABS_X and ABS_Y values, as calling
> > input_mt_sync_frame() effectively takes care of this by way of pointer
> > emulation.
> >
> 
> After double checking/testing this, it doesn't seems to
> report ABS_X/Y values anymore, are you sure about this ? Maybe I missed
> some extra flag in input_mt_init_slots() for that ?

You are missing call to input_report_slot_state() before you start
sending position data. You also should not conflate tracking ID and
slot number. I.e. if you touch and release and touch again, you
likely report through the same slot 0, but the tracking ID of the
contact should be different.

Thanks.

-- 
Dmitry