Hello David, On Sat, May 26, 2012 at 7:44 AM, David Herrmann <dh.herrmann@xxxxxxxxxxxxxx> wrote: > Hi Joao > > I CC'ed Jiri as he is the HID maintainer. > > On Fri, May 25, 2012 at 10:51 PM, Joao Paulo Rechi Vita > <jprvita@xxxxxxxxxxxxx> wrote: >> Hello all, >> >> I'm working to support HID over GATT (HoG), which is HID over >> Bluetooth Low Energy links, both on kernel and userspace. Traffic >> coming from the remote peripheral through a L2CAP socket will be >> handled in usespace, where the HID input reports are decapsulated from >> GATT and injected back into the kernel through the new uHID module >> written by David Herrmann. This module works similar to uinput, but >> dealing with HID traffic. >> >> The input part is working without problems and now I looking how to >> support Output and Feature reports. Doing some basic testing it seems >> we don't support Output reports very well. A basic use-case for that >> is synchronizing keyboard leds (CAPS, NUM, etc) when there is more >> than one keyboard connected, and I couldn't get this to work on my >> tests. I didn't try to test feature reports since it's still not very >> clear to me when they're used. The HID spec says that they exist for >> setting values/controls on the peripheral that are not visible to the >> user, but I haven't discovered any real-world use case for them. What >> is the current state for these reports, do we support them somehow? > > I think my last revision of uhid added support for feature-reports. > However, they are not used by the generic hid-input driver. If there > is currently no specialized bluetooth-LE HID driver, you also do not > need to worry about it. > Yes, I've seen the new event types for them, what I'm looking for is how to trigger them. > I think the new generic HID battery-detection code uses the > feature-reports. However, its disabled by default if I remember > correctly. > I will check this out, thanks for the hint. > About output-reports: Do you correctly receive the UHID_OUTPUT_EV > request in user-space? Do you send the packet to the device? How do > you format it? > I was correctly receiving it with the previous version of your patch. With this new version I still receive an event coming from the host, but with ev.type value out of the enum range (different values like this: 2062073856). What is the difference between UHID_OUTPUT_EV and UHID_OUTPUT events? Should both of them be written to the device? >> Also, I've found usbhid-dump by Greg K-H, but it doesn't seem to dump >> data coming from the host to the device. Is this on the plans for this >> tool? I can try to send a patch for it, if someone can guide me on how >> this whole output/feature reports thing should work. > > Regards > David -- João Paulo Rechi Vita Openbossa Labs - INdT -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
