On Sat, 2009-09-19 at 15:44 +0300, Matan Ziv-Av wrote: > On Sat, 19 Sep 2009, Laurent GUERBY wrote: > > > On Fri, 2009-09-18 at 22:55 +0200, Kees Jongenburger wrote: > >> Hi, > >> > >> I plan to create a proposal for the push n900[1] and I plan to use the > >> usb port. I have the following question. > >> When the device is in usb-host mode it should of course provide power does > >> it? > >> Is it possible to charge the device while it's in usb-host mode? > > > > The other way around: is it technically possible to have the n900 (and > > n810) behave as an USB keyboard when connected to a PC? And even better > > emulate any other USB device like a webcam, etc...? > > I expect the hardware can do it, but it needs some work in kernel space. > The 2.6.29 kernel can appear as an ethernet, serial, mass storage, midi > audio or printer device. Anything else, needs a driver written. > Gadget drivers can also be in user space, using gadgetfs, but I don't > know of any examples.
Hi, Thanks for your answer! Looking around for "gadget" I found: http://www.linux-usb.org/gadget/ << Other controller and gadget drivers are in development, but are unreleased or not published here. Examples that have seen some degree of light include: * HID driver (userspace, with gadgetfs), * "MTP" (Media Transfer Protocol, PTP++) driver (userspace, with gadgetfs), * two different printer class drivers (used in various products), * audio class driver (very experimental). * video class driver (very experimental). >> (HID is keyboard+mouse+other input devices) I found a discussion of some issue with "Issues with simulating a keyboard device with gadgetfs" here: http://kerneltrap.org/mailarchive/linux-usb/2009/4/10/5455984/thread Which points to an unapplied kernel patch. So transforming a N900/N810 as a pocket USB keyboard (+ mouse/tablet), and may be hacker wireless IP KVM using camera/webcam over LCD looks like quite a bit of kernel-level work :). Sincerely, Laurent _______________________________________________ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers
