On Tue, May 06, 2014 at 01:04:12AM +0200, Sebastian Reichel wrote: > On Mon, May 05, 2014 at 12:51:39PM -0700, Dmitry Torokhov wrote: > > On Mon, May 05, 2014 at 12:41:26PM -0700, Tony Lindgren wrote: > > > * Sebastian Reichel <s...@kernel.org> [140425 16:56]: > > > > Add common DT binding documentation for touchscreen devices and > > > > implement input_parse_touchscreen_of_params, which parses the common > > > > properties and configures the input device accordingly. > > > > > > > > The method currently does not interpret the axis inversion properties, > > > > since there is no matching flag in the generic linux input device. > > > > > > > > Signed-off-by: Sebastian Reichel <s...@kernel.org> > > > > --- > > > > .../bindings/input/touchscreen/touchscreen.txt | 27 > > > > +++++++++++++++++ > > > > drivers/input/input.c | 34 > > > > ++++++++++++++++++++++ > > > > include/linux/input.h | 8 +++++ > > > > 3 files changed, 69 insertions(+) > > > > create mode 100644 > > > > Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt > > > > > > > > diff --git > > > > a/Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt > > > > b/Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt > > > > new file mode 100644 > > > > index 0000000..d8e0616 > > > > --- /dev/null > > > > +++ > > > > b/Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt > > > > @@ -0,0 +1,27 @@ > > > > +General Touchscreen Properties: > > > > + > > > > +Optional properties for Touchscreens: > > > > + - touchscreen-size-x : horizontal resolution of touchscreen > > > > + (in pixels) > > > > + - touchscreen-size-y : vertical resolution of touchscreen > > > > + (in pixels) > > > > + - touchscreen-max-pressure : maximum reported pressure (arbitrary > > > > range > > > > + dependent on the controller) > > > > + - touchscreen-fuzz-x : horizontal noise value of the > > > > absolute input > > > > + device (in pixels) > > > > + - touchscreen-fuzz-y : vertical noise value of the absolute > > > > input > > > > + device (in pixels) > > > > + - touchscreen-fuzz-pressure : pressure noise value of the absolute > > > > input > > > > + device (arbitrary range dependent on > > > > the > > > > + controller) > > > > Fuzz seems like linux-specific property, not generic one. > > I don't know about the term "fuzz", but the idea is pretty generic > IMHO. It's similar to debouncing switches/buttons.
OK, fair enough. > > > > > + - touchscreen-inverted-x : X axis is inverted (boolean) > > > > + - touchscreen-inverted-y : Y axis is inverted (boolean) > > > > > > We probably also need something to swap x and y depending on the > > > display orientation in addition to the touchscreen-inverted-x and y. > > > Just swapping x and y is not enough depending if we rotate by 270 > > > degrees instead of 90 degrees. > > > > > > Naturally that part can be added later. > > > > So far we've been relying on upper layers (such as tslib) to perform > > such transformations rather than re-implementing it in every driver. Are > > we saying that we need to implement this in input core? > > I would appreciate to add this later to move on with this patchset. > Having the N900's touchscreen working via DT in 3.16 would be nice > now that the display is working :) > Please remove the "inverted" bits and move touchscreen OF parsing into a separate file/module, similarly to support for sparse and matrix keymaps that we have - it does not really belong to input core. Thanks. -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
