On Thu, May 31, 2018 at 3:42 PM, Hans de Goede <hdegoede@xxxxxxxxxx> wrote: > Hi, > > On 31-05-18 19:25, Rob Herring wrote: >> >> On Tue, May 29, 2018 at 01:52:38PM +0200, Hans de Goede wrote: >>> >>> Some touchscreens, depending on the firmware and/or the digitizer report >>> coordinates which never reach 0 along one or both of their axis. >>> >>> This has been seen for example on the Silead touchscreens on a Onda V891w >>> and a Point of View mobii TAB-P800w(v2.0). >>> >>> This commit adds support for touchscreen-min-x and touchscreen-min-y >>> device-properties which can be set to communicate the actual start >>> coordinates (rather then 0,0) to userspace. >>> >>> When set this fixes e.g. not being able to click things in the GNOME3 >>> top-bar on the 2 example tablets. >>> >>> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> >>> --- >>> .../input/touchscreen/touchscreen.txt | 6 ++-- >> >> >> Please split bindings to separate patch. > > > Will do for v2. > >>> drivers/input/touchscreen/of_touchscreen.c | 36 ++++++++++++++----- >>> 2 files changed, 32 insertions(+), 10 deletions(-) >>> >>> diff --git >>> a/Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt >>> b/Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt >>> index 537643e86f61..8aff9551259f 100644 >>> --- a/Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt >>> +++ b/Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt >>> @@ -1,10 +1,12 @@ >>> General Touchscreen Properties: >>> Optional properties for Touchscreens: >>> + - touchscreen-min-x : minimum x coordinate reported (0 if not >>> set) >>> + - touchscreen-min-y : minimum y coordinate reported (0 if not >>> set) >> >> >> Maybe a min-max range would be better if size (in pixels) is also >> needed? > > > Size in pixels is never needed. The touchscreen-size-x / > touchscreen-size-y have always been the max x/y coordinate reported + 1 > and may or may not have anything to do with pixels. I've noticed on > some ARM tablets that the firmware in the touchscreen controller was > programmed to send coordinates in the same range as the display > resolution, but then the manufacturer would turn around, put in > a higher res display and keep the same touchscreen range (or the > otherway around). So it seems that there has been a 1:1 mapping on > some devices, but that has not been true for a long time now. > >>> - touchscreen-size-x : horizontal resolution of touchscreen >>> - (in pixels) >>> + (maximum x coordinate reported + 1) >> >> >> This is unrelated or at least not explained in the commit msg. I agree >> this probably makes sense as units are often not pixels unless the hw/fw >> is doing some scaling itself. > > > Right I added this fix to make clear that we are indeed specifying a > min-max range, with the oddity that instead of max we specify max + 1 > for historical reasons. > > Do you want me to split this out into a separate patch? No, just some explanation in this one is fine. Rob -- 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
