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Input: of_touchscreen - add support for touchscreen-min-x|y 

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.

This commit also drop the "(in pixels)" comment from the documentation
of the touchscreen-size-x and touchscreen-size-y properties. The comment
suggested that there is a relation between the range of reported
coordinates and the display resolution, which is only true for some
devices. The "(in pixels)" comment is replaced with "(maximum x coordinate
reported + 1)" to mirror the language describing the new touchscreen-min-x
and -min-y properties.

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@redhat.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Hans de Goede 2018-10-11 17:04:13 -07:00 committed by Dmitry Torokhov
parent 291e2ba905
commit d9265e8a87
2 changed files with 32 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
View File

@ -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)
- touchscreen-size-x : horizontal resolution of touchscreen
(in pixels)
(maximum x coordinate reported + 1)
- touchscreen-size-y : vertical resolution of touchscreen
(in pixels)
(maximum y coordinate reported + 1)
- touchscreen-max-pressure : maximum reported pressure (arbitrary range
dependent on the controller)
- touchscreen-fuzz-x : horizontal noise value of the absolute input

36
drivers/input/touchscreen/of_touchscreen.c
View File

@ -35,7 +35,7 @@ static bool touchscreen_get_prop_u32(struct device *dev,
static void touchscreen_set_params(struct input_dev *dev,
unsigned long axis,
int max, int fuzz)
int min, int max, int fuzz)
{
struct input_absinfo *absinfo;
@ -47,6 +47,7 @@ static void touchscreen_set_params(struct input_dev *dev,
}
absinfo = &dev->absinfo[axis];
absinfo->minimum = min;
absinfo->maximum = max;
absinfo->fuzz = fuzz;
}
@ -68,8 +69,9 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
struct touchscreen_properties *prop)
{
struct device *dev = input->dev.parent;
struct input_absinfo *absinfo;
unsigned int axis;
unsigned int maximum, fuzz;
unsigned int minimum, maximum, fuzz;
bool data_present;
input_alloc_absinfo(input);
@ -77,7 +79,10 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
return;
axis = multitouch ? ABS_MT_POSITION_X : ABS_X;
data_present = touchscreen_get_prop_u32(dev, "touchscreen-size-x",
data_present = touchscreen_get_prop_u32(dev, "touchscreen-min-x",
input_abs_get_min(input, axis),
&minimum) |
touchscreen_get_prop_u32(dev, "touchscreen-size-x",
input_abs_get_max(input,
axis) + 1,
&maximum) |
@ -85,10 +90,13 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
input_abs_get_fuzz(input, axis),
&fuzz);
if (data_present)
touchscreen_set_params(input, axis, maximum - 1, fuzz);
touchscreen_set_params(input, axis, minimum, maximum - 1, fuzz);
axis = multitouch ? ABS_MT_POSITION_Y : ABS_Y;
data_present = touchscreen_get_prop_u32(dev, "touchscreen-size-y",
data_present = touchscreen_get_prop_u32(dev, "touchscreen-min-y",
input_abs_get_min(input, axis),
&minimum) |
touchscreen_get_prop_u32(dev, "touchscreen-size-y",
input_abs_get_max(input,
axis) + 1,
&maximum) |
@ -96,7 +104,7 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
input_abs_get_fuzz(input, axis),
&fuzz);
if (data_present)
touchscreen_set_params(input, axis, maximum - 1, fuzz);
touchscreen_set_params(input, axis, minimum, maximum - 1, fuzz);
axis = multitouch ? ABS_MT_PRESSURE : ABS_PRESSURE;
data_present = touchscreen_get_prop_u32(dev,
@ -108,7 +116,7 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
input_abs_get_fuzz(input, axis),
&fuzz);
if (data_present)
touchscreen_set_params(input, axis, maximum, fuzz);
touchscreen_set_params(input, axis, 0, maximum, fuzz);
if (!prop)
return;
@ -117,13 +125,25 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
prop->max_x = input_abs_get_max(input, axis);
prop->max_y = input_abs_get_max(input, axis + 1);
prop->invert_x =
device_property_read_bool(dev, "touchscreen-inverted-x");
if (prop->invert_x) {
absinfo = &input->absinfo[axis];
absinfo->maximum -= absinfo->minimum;
absinfo->minimum = 0;
}
prop->invert_y =
device_property_read_bool(dev, "touchscreen-inverted-y");
if (prop->invert_y) {
absinfo = &input->absinfo[axis + 1];
absinfo->maximum -= absinfo->minimum;
absinfo->minimum = 0;
}
prop->swap_x_y =
device_property_read_bool(dev, "touchscreen-swapped-x-y");
if (prop->swap_x_y)
swap(input->absinfo[axis], input->absinfo[axis + 1]);
}