linux-kernel - Re: [PATCH v4 13/14] HID: hid-multitouch: fix Win 8 protocol

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Message-ID: <20121114184726.GA11943@polaris.bitmath.org>
Date:	Wed, 14 Nov 2012 19:47:26 +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 v4 13/14] HID: hid-multitouch: fix Win 8 protocol

On Wed, Nov 14, 2012 at 04:59:25PM +0100, Benjamin Tissoires wrote:
> The Win 8 protocol specify the fact that each valid touch must be reported
> within a frame until it is released.
> We can therefore use the always_valid quirk and dismiss reports when we see
> duplicate contacts ID.
> 
> We recognize Win8 certified devices from their vendor feature 0xff0000c5
> where Microsoft put a signed blob in the report to check if the device
> passed the certification.
> 
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...il.com>
> ---
>  drivers/hid/hid-multitouch.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> index 5f26b2f..efae60c 100644
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -295,6 +295,18 @@ static void mt_feature_mapping(struct hid_device *hdev,
>  			td->maxcontacts = td->mtclass.maxcontacts;
>  
>  		break;
> +	case 0xff0000c5:
> +		if (field->report_count == 256 && field->report_size == 8) {
> +			/* Win 8 devices need special quirks */
> +			__s32 *quirks = &td->mtclass.quirks;
> +			*quirks |= MT_QUIRK_ALWAYS_VALID;
> +			*quirks |= MT_QUIRK_IGNORE_DUPLICATES;
> +			*quirks |= MT_QUIRK_HOVERING;
> +			*quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP;
> +			*quirks &= ~MT_QUIRK_VALID_IS_INRANGE;
> +			*quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE;
> +		}
> +		break;
>  	}
>  }
>  
> -- 
> 1.8.0
> 

    Reviewed-by: Henrik Rydberg <rydberg@...omail.se>

Thanks,
Henrik
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