* Adonit Jot Pixel Stylus driver @ 2017-01-24 4:12 David Farrell 2017-01-25 10:19 ` Benjamin Tissoires 0 siblings, 1 reply; 3+ messages in thread From: David Farrell @ 2017-01-24 4:12 UTC (permalink / raw) To: linux-input 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? Many thanks in advance David ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Adonit Jot Pixel Stylus driver 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 0 siblings, 1 reply; 3+ messages in thread From: Benjamin Tissoires @ 2017-01-25 10:19 UTC (permalink / raw) To: David Farrell; +Cc: linux-input, Peter Hutterer 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 > -- > To unsubscribe from this list: send the line "unsubscribe linux-input" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Adonit Jot Pixel Stylus driver 2017-01-25 10:19 ` Benjamin Tissoires @ 2017-01-25 17:50 ` David Farrell 0 siblings, 0 replies; 3+ messages in thread From: David Farrell @ 2017-01-25 17:50 UTC (permalink / raw) To: Benjamin Tissoires; +Cc: linux-input, Peter Hutterer 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 >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-input" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2017-01-25 17:50 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 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 is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.