linux-kernel - Re: [PATCH v2 1/3] hid-multitouch: add support for trackpads

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Date:	Tue, 24 Jan 2012 15:34:12 +0100
From:	Benjamin Tissoires <benjamin.tissoires@...c.fr>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Henrik Rydberg <rydberg@...omail.se>,
	Jiri Kosina <jkosina@...e.cz>,
	Stephane Chatty <chatty@...c.fr>,
	Mohamed Ikbel Boulabiar <boulabiar@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] hid-multitouch: add support for trackpads

Hi Dmitry and Henrik,

Thanks Dmitry for the comment.

I'll do the change as you mentioned and will also remove the
input_mt_report_finger_count call.

Cheers,
Benjamin

On Fri, Jan 20, 2012 at 17:48, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> On Fri, Jan 20, 2012 at 05:09:48PM +0100, Henrik Rydberg wrote:
>> Hi Benjamin,
>>
>> > @@ -389,9 +404,19 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
>> >                             td->last_field_index = field->index;
>> >                     return -1;
>> >             }
>> > +           case HID_DG_TOUCH:
>> > +                   /* Legacy devices use TIPSWITCH and not TOUCH.
>> > +                    * Let's just ignore this field. */
>> > +                   return -1;
>> >             /* let hid-input decide for the others */
>> >             return 0;
>> >
>> > +   case HID_UP_BUTTON:
>> > +           code = ((usage->hid - 1) & HID_USAGE) + BTN_MOUSE;
>>
>> Why '+' here instead of '|' is  beyond me...
>
> Because it is an offset for the range. The fact that it is on power 2
> boundary and we can use "|" is purely coincidential here.
>
> Maybe we should even write it as:
>
>                code = BTN_MOUSE + ((usage->hid - 1) & HID_USAGE);
>
> Thanks,
> Dmitry
>
> --
> Dmitry
> --
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