Hey everyone, I wasn't entirely sure if there was a better place to ask such a question, but I figured this might be as good a place as any for a question like this -- if not, please kindly let me know who I should ask or even if I should Google better. I am using a laptop (specifically the Razer Blade R2), and the keyboard and mouse share one USB device, differentiating each input by interface. By default (i.e. when essentially not touched at all), the trackpad emulates a standard USB HID pointer (with incidental implementations of certain gestures in-hardware -- pinch-to-zoom will send button 4 or 5, for instance) and the keyboard a standard USB HID keyboard. There are four interfaces in total, however: trackpad on 0, keyboard on 2, "extras" on 1, and vendor-specific bulk-write endpoints on 3. I say "emulates" because it does a very curious thing when the trackpad interface (0) is set to the USB alternate setting of 1: any pretense of being HID inputs for keyboard OR mouse is completely dropped -- yes, even despite the keyboard being on a separate interface. Keyboard input begins routing via the "extras" interface on 1 rather than coming in from 2, and while it still looks like HID to my rather untrained eye, there are actually several more spaces for keypresses (for the keyboard -- 14 spaces total plus modifier byte for ctrl/alt/etc) and it appears report IDs (or at least, some sort of ID corresponding to the input being done) start being prepended to the incoming data. "Extras" also begins differentiating which macro keys -- the display-backed keys above the touchpad -- have been pressed (it does not do this in HID mode) and begins to send input for the Fn and Razer logo keys. The trackpad's enhanced input seems to consist of five structures per packet, one for each finger, and the last four are prepended with a byte whose lower half indicates which finger is being reported and whose higher half indicates how many fingers total are being used. The structure itself seems to be laid out (in hex): 1P BB XX XX YY YY UU -- where P *might be* pressure or width, B is mouse button pressed (and does carry through to all fingers), X and Y are X and Y coordinates of the finger in big-endian quadrant-1 (higher Y == closer to top, higher X == closer to right), and I haven't been able to figure out U yet. After the five structures (which are terminated with a byte reading x4 -- where "x" in this case is the number of fingers), there appear to be 24 more bytes that don't ever seem to be anything other than 0. Otherwise, both keyboard and extras "enhanced input" just seem to report for two different keyboards. If I mash my palm on the touchpad, though, I get an apparent report ID of 0x05 with some other data that I'm not sure how to interpret, I assume it's telling me exactly what I'm doing but nothing more specific than that. Has anyone seen an input device like this before? I've also written a test program which can be found at http://fxchip.net/RazerBlade/razer-test.tar.bz2 , but it's sort of rough in a lot of ways. If you're interested in the report descriptors, as well, here's a link to my lsusb -vv -d 1532:0116 output with usbhid detached: http://pastie.org/7961204 -- if you'd prefer it inline I might be able to do that too. Thanks in advance, Zach -- 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
