linux-kernel - Re: [PATCH RESEND v8 2/4] input: elants: support old touch report format

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Message-ID: <20201211160917.GA23095@qmqm.qmqm.pl>
Date:   Fri, 11 Dec 2020 17:09:17 +0100
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Dmitry Osipenko <digetx@...il.com>,
        Johnny Chuang <johnny.chuang.emc@...il.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v8 2/4] input: elants: support old touch report
 format

On Thu, Dec 10, 2020 at 11:29:40PM -0800, Dmitry Torokhov wrote:
> Hi Michał,
> On Fri, Dec 11, 2020 at 07:53:56AM +0100, Michał Mirosław wrote:
> > @@ -998,17 +1011,18 @@ static irqreturn_t elants_i2c_irq(int irq, void *_dev)
> >  			}
> >  
> >  			report_len = ts->buf[FW_HDR_LENGTH] / report_count;
> > -			if (report_len != PACKET_SIZE) {
> > +			if (report_len != PACKET_SIZE &&
> > +			    report_len != PACKET_SIZE_OLD) {
> >  				dev_err(&client->dev,
> > -					"mismatching report length: %*ph\n",
> > +					"unsupported report length: %*ph\n",
> >  					HEADER_SIZE, ts->buf);
> Do I understand this correctly that the old packets are only observed on
> EKTF3624? If so can we expand the check so that we only accept packets
> with "old" size when we know we are dealing with this device?

We only have EKTF3624 and can't be sure there are no other chips needing this.

Best Regards
Michał Mirosław