On Wed, 15 Sep 2010, Nikolai Kondrashov wrote: > Add absolute axis resolution calculation to the core HID layer, according to HID > specification v1.11 6.2.2.7 Global Items. Only exponent 1 length units for > X/Y/Z/RX/RY/RZ axis are supported for now. > > Signed-off-by: Nikolai Kondrashov <spbnick@xxxxxxxxx> > --- > > The code tries to preserve the precision at the cost of possible overflow. > That's why radians are chosen for rotation resolution. The code is tested using > synthetic report descriptors and it remains to be seen how it will behave in the > wild. > > Though devices correctly specifying their physical extents are pretty rare, this > code could also be used to decode resolution from fixed report descriptors of > such HID drivers as waltop and uclogic. > > I plan to use it for retrieving tablet resolution in the xf86-input-wacom > driver. > > drivers/hid/hid-input.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++ > 1 files changed, 80 insertions(+), 0 deletions(-) Now applied, thanks Nikolai! -- Jiri Kosina SUSE Labs, Novell Inc. -- 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
