linux-kernel - Re: [PATCH v2 04/11] HID: hid-multitouch: support arrays for the split of the touches in a report

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Message-ID: <20121029214925.GA15400@polaris.bitmath.org>
Date:	Mon, 29 Oct 2012 22:49:25 +0100
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Benjamin Tissoires <benjamin.tissoires@...il.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Stephane Chatty <chatty@...c.fr>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 04/11] HID: hid-multitouch: support arrays for the
 split of the touches in a report

Hi Benjamin,

> Win8 certification introduced the ability to transmit two X and two Y per
> touch. The specification precises that it must be in an array, with a
> report count == 2.

The number two never really enters the patch, so maybe it should be
dropped to avoid confusion. It probably makes more sense to comment on
in a later patch, when the reports are actually used.

> 
> This test guarantees that we split the touches on the last element
> in this array.
> 
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...c.fr>
> ---
>  drivers/hid/hid-multitouch.c | 16 ++++++++++------
>  1 file changed, 10 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> index 725d155..95562d8 100644
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -577,12 +577,16 @@ static int mt_event(struct hid_device *hid, struct hid_field *field,
>  			return 0;
>  		}
>  
> -		if (usage->hid == td->last_slot_field)
> -			mt_complete_slot(td, field->hidinput->input);
> -
> -		if (field->index == td->last_field_index
> -			&& td->num_received >= td->num_expected)
> -			mt_sync_frame(td, field->hidinput->input);
> +		if (usage_index + 1 == field->report_count) {
> +			/* we only take into account the last report
> +			 * of a field if report_count > 1 */

Seems we could drop "of a field if report_count > 1" here, and be even
more correct.

> +			if (usage->hid == td->last_slot_field)
> +				mt_complete_slot(td, field->hidinput->input);
> +
> +			if (field->index == td->last_field_index
> +				&& td->num_received >= td->num_expected)
> +				mt_sync_frame(td, field->hidinput->input);
> +		}
>  
>  	}
>  
> -- 
> 1.7.11.7

Thanks,
Henrik
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