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. I think the new generic HID battery-detection code uses the feature-reports. However, its disabled by default if I remember correctly. 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? > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
