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Date:	Thu, 3 Jan 2013 12:34:42 +0100
From:	Benjamin Tissoires <benjamin.tissoires@...il.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	Stephane Chatty <chatty@...c.fr>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/11] Support of dual pen/multitouch and new default for
 win 7 certified devices

On Thu, Jan 3, 2013 at 10:50 AM, Jiri Kosina <jkosina@...e.cz> wrote:
> On Fri, 23 Nov 2012, Benjamin Tissoires wrote:
>
>> Last week, I received two new interesting devices report:
>> - N-trig win 8 certified pen/touch panel
>> - Samsung Nexio 42"
>
> Bejmanin, Henrik, what are the plans with this patchset please? Planning
> respin for 3.9?
>

Hi Jiri,

sure. I intend to make a respin of this patch series. I spent a lot of
time lately to automate regressions tests for hid-multitouch. Lucky
me, because some patches of the original series would have broken some
devices. It also helped me to find out 2 other broken devices (they
were broken since their inclusion in hid-multitouch)....

The tests automation is pretty useful, however it can not be used as
this on a vanilla kernel due to the direct dependencies against
usbhid.
Henrik, you told us that you have a patch set fixing these
dependencies on all the hid drivers, will you prepare it for 3.9? Do
you want me to continue your work?

Cheers,
Benjamin


> Thanks.
>
>>
>>
>> N-trig device
>> -------------
>> The first one is the origin of patches 1 to 6.
>> The multiouch part worked flawlessly with the win 8 patches I sent before,
>> but the pen part was completely ignored.
>> I could have used the quirk MULTI_INPUT, but by testing this quirk against
>> several devices report I have (https://github.com/bentiss/hid-devices), it
>> was a pain because some of them create 4 or 5 useless inputs.
>>
>> I choose to allow the hid driver to control the creation of input devices, thus
>> patches 1 to 3.
>>
>>
>> Nexio device
>> ------------
>> The second one was more problematic. Indeed, it was not working at all with the
>> current release of hid-multitouch. I had several ghost points, and any of the
>> available quirks worked.
>> I finaly found the trick, and this trick applies to all the win7 and win8
>> devices I saw so far (same url as before).
>>
>> So I think I finally understood why the windows driver was better than us: it
>> first looks at the announced contact count, and treat only the right number. It
>> was so simple... and it works so well...
>>
>> However, for us, I need to get this information from the raw_event because most
>> of the devices put the contact count field at the end of the report.
>>
>> I also decided to change the default class as it is much more tolerant than the
>> previous one. I could have changed all the devices, but in the end, I changed
>> only those that get a benefit and that I could test.
>>
>>
>> Debug tool
>> ----------
>> I was able to discover this trick only recently because I made a small C program
>> that allows me to replay the hid events through hid-multitouch. The code is
>> here: https://github.com/bentiss/hid-replay and you will need a kernel 3.6
>> to make it work (it requires uhid).
>>
>> However, be careful, this program can be the root of many kernel oopses if the
>> targeted hid module tries to directly handle the usb or with any of the usbhid
>> function.
>> So, Henrik, I really need you to push your abstraction of usbhid in all hid
>> modules :)
>>
>> Anyway, this tool can be very helpful to debug hid devices, that's why I share
>> it there... and also because I work for an open-source company :)
>>
>> Happy reviewing.
>>
>> Cheers,
>> Benjamin
>>
>> Benjamin Tissoires (11):
>>   HID: hid-input factorize hid_input allocation
>>   HID: hid-input: simplify hid_input allocation and registration
>>   HID: hid-input: export hidinput_allocation function
>>   HID: hid-multitouch: creates and handle stylus report with dual-sensors
>>   HID: hid-multitouch: manually send sync event for pen input report
>>   HID: hid-multitouch: append " Pen" to the name of the stylus input
>>   HID: hid-multitouch: rename MT_CLS_DEFAULT into MT_CLS_NSMU
>>   HID: hid-multitouch: add support for Nexio 42" panel
>>   HID: hid-multitouch: check if ContactCount is given for default quirk
>>   HID: hid-multitouch: fix protocol for 3 devices
>>   HID: hid-multitouch: use MT_QUIRK_CONTACT_COUNT_ACCURATE for win 8 devices
>>
>>  drivers/hid/hid-ids.h        |   3 +
>>  drivers/hid/hid-input.c      | 100 +++++++++++++---------
>>  drivers/hid/hid-multitouch.c | 198 +++++++++++++++++++++++++++++++++++--------
>>  include/linux/hid.h          |   1 +
>>  4 files changed, 229 insertions(+), 73 deletions(-)
>>
>> --
>> 1.8.0
>>
>
> --
> Jiri Kosina
> SUSE Labs
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