From: David Farrell <davidnmfarrell@gmail.com>
To: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Cc: linux-input <linux-input@vger.kernel.org>,
Peter Hutterer <peter.hutterer@who-t.net>
Subject: Re: Adonit Jot Pixel Stylus driver
Date: Wed, 25 Jan 2017 12:50:54 -0500 [thread overview]
Message-ID: <CAAzBBqtYp3sS5J0-W=xD+0Ktq0+s+jWgqyPNdBocO_r1WR-gNw@mail.gmail.com> (raw)
In-Reply-To: <CAN+gG=FZhRwNQfsrsWCdswGMsq2wBWtyx2N7UT_SDWQLBQycJg@mail.gmail.com>
Hi Benjamin,
Ah that makes sense, it was Peter who directed me towards a
driver-based solution. Thank you for your detailed response, this is
everything I need to get started.
David
On 25 January 2017 at 05:19, Benjamin Tissoires
<benjamin.tissoires@gmail.com> wrote:
> On Tue, Jan 24, 2017 at 5:12 AM, David Farrell <davidnmfarrell@gmail.com> wrote:
>> Hi folks,
>>
>> I have an adonit jot pixel bluetooth stylus. Adapting someone else's
>> code (source http://gerev.github.io/laptop-cintiq/) I have it working
>> with uinput, posting ABS_PRESSURE and BTN_1/2 event codes and so on.
>> I'm running upstream.
>>
>> What I'm wondering is; as the stylus relies on a bluetooth connection,
>> is it a suitable device to develop a kernel input driver for? And if
>> yes, are there any reference drivers you'd recommend I look at?
>
> Hi,
>
> Coincidentally, I talked to Peter yesterday about this very same
> stylus. I can only talk for the Wacom Creative Stylus 2, which I have,
> but which I believe is similar to yours in many aspects.
> So if your stylus is similar to mine, it uses BLE (or Bluetooth 4).
> And in that case, you don't really need to write a kernel driver, but
> more a bluez plugin in the same way HID over GATT (HID over BLE) is
> working. This requires connecting over BLE to the stylus, then create
> a uhid device (and you will have to write the report descriptors
> matching your device by reverse engineering it), and inject that uhid
> device in the same way bluez does for HID over GATT. Then you just
> need to forward the raw events from the device to the uhid node and
> the kernel will simply translate the events for you.
>
> As a starter, you can have a look at profiles/input/hog.c and
> profiles/input/hog-lib.c in the bluez repository.
>
> Of course, if the stylus is not using BLE, then it perfectly makes
> sense to write a full kernel driver for it (but I strongly suspect it
> uses BLE).
>
> Cheers,
> Benjamin
>
>>
>> Many thanks in advance
>>
>> David
>> --
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prev parent reply other threads:[~2017-01-25 17:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-24 4:12 Adonit Jot Pixel Stylus driver David Farrell
2017-01-25 10:19 ` Benjamin Tissoires
2017-01-25 17:50 ` David Farrell [this message]
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