Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755241Ab2KMQZU (ORCPT ); Tue, 13 Nov 2012 11:25:20 -0500 Received: from smtprelay-b21.telenor.se ([195.54.99.212]:48119 "EHLO smtprelay-b21.telenor.se" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754106Ab2KMQZR (ORCPT ); Tue, 13 Nov 2012 11:25:17 -0500 X-SENDER-IP: [85.230.29.114] X-LISTENER: [smtp.bredband.net] X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AjWwALxzolBV5h1yPGdsb2JhbABEhTGFI7gXAgF+GQEBAQEfGQ0ngh4BAQQBJxMcIwULCANGFA0YChoTHodaAwkKqX+GTw2JVBSLLYFigX6CfGEDlCeBVIV7hTiIAQ X-IronPort-AV: E=Sophos;i="4.80,768,1344204000"; d="scan'208";a="448608770" From: "Henrik Rydberg" Date: Tue, 13 Nov 2012 17:31:38 +0100 To: Benjamin Tissoires Cc: Dmitry Torokhov , Jiri Kosina , Stephane Chatty , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 10/13] HID: hid-multitouch: fix Win 8 protocol Message-ID: <20121113163138.GA707@polaris.bitmath.org> References: <1352306256-12180-1-git-send-email-benjamin.tissoires@gmail.com> <1352306256-12180-11-git-send-email-benjamin.tissoires@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1352306256-12180-11-git-send-email-benjamin.tissoires@gmail.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2771 Lines: 92 Hi Benjamin, > Win 8 specification is much more precise than the Win 7 one. > Moreover devices that need to take certification must be submitted > to Microsoft. > > The result is a better protocol support and we can rely on that to > skip all the messy tests we used to do. > You could possibly start the commit message here.. > The protocol specify the fact that each valid touch must be reported The win8 protocol... > within a frame until it is released. > So we can use the always_valid quirk and dismiss reports when we see We can therefore... > duplicates contact ID. duplicate contacts. > > 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 > --- > drivers/hid/hid-multitouch.c | 12 ++++++++++-- > 1 file changed, 10 insertions(+), 2 deletions(-) > > diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c > index 351c814..b393c6c 100644 > --- a/drivers/hid/hid-multitouch.c > +++ b/drivers/hid/hid-multitouch.c > @@ -53,6 +53,7 @@ MODULE_LICENSE("GPL"); > #define MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE (1 << 8) > #define MT_QUIRK_NO_AREA (1 << 9) > #define MT_QUIRK_IGNORE_DUPLICATES (1 << 10) > +#define MT_QUIRK_WIN_8_CERTIFIED (1 << 11) > > struct mt_slot { > __s32 x, y, cx, cy, p, w, h; > @@ -293,6 +294,10 @@ 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) > + td->mtclass.quirks |= MT_QUIRK_WIN_8_CERTIFIED; > + break; > } > } > > @@ -679,14 +684,17 @@ static void mt_post_parse_default_settings(struct mt_device *td) > { > __s32 quirks = td->mtclass.quirks; > > - /* unknown serial device needs special quirks */ > - if (td->touches_by_report == 1) { > + /* unknown serial devices or win8 ones need special quirks */ > + if (td->touches_by_report == 1 || (quirks & MT_QUIRK_WIN_8_CERTIFIED)) { > quirks |= MT_QUIRK_ALWAYS_VALID; > quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP; > quirks &= ~MT_QUIRK_VALID_IS_INRANGE; Won't this line interfere with the hovering functionality? > quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE; > } > > + if (quirks & MT_QUIRK_WIN_8_CERTIFIED) > + quirks |= MT_QUIRK_IGNORE_DUPLICATES; > + > td->mtclass.quirks = quirks; > } > > -- > 1.7.11.7 > Thanks, Henrik -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/