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

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Message-ID: <X9Mf5G6yvIEAoh2C@google.com>
Date:   Thu, 10 Dec 2020 23:29:40 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>
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

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?

Thanks.

-- 
Dmitry