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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>
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@ -1,10 +1,12 @@
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General Touchscreen Properties:
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Optional properties for Touchscreens:
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- touchscreen-min-x : minimum x coordinate reported (0 if not set)
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- touchscreen-min-y : minimum y coordinate reported (0 if not set)
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- touchscreen-size-x : horizontal resolution of touchscreen
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(in pixels)
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(maximum x coordinate reported + 1)
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- touchscreen-size-y : vertical resolution of touchscreen
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(in pixels)
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(maximum y coordinate reported + 1)
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- touchscreen-max-pressure : maximum reported pressure (arbitrary range
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dependent on the controller)
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- touchscreen-fuzz-x : horizontal noise value of the absolute input
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@ -35,7 +35,7 @@ static bool touchscreen_get_prop_u32(struct device *dev,
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static void touchscreen_set_params(struct input_dev *dev,
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unsigned long axis,
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int max, int fuzz)
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int min, int max, int fuzz)
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{
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struct input_absinfo *absinfo;
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@ -47,6 +47,7 @@ static void touchscreen_set_params(struct input_dev *dev,
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}
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absinfo = &dev->absinfo[axis];
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absinfo->minimum = min;
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absinfo->maximum = max;
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absinfo->fuzz = fuzz;
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}
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@ -68,8 +69,9 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
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struct touchscreen_properties *prop)
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{
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struct device *dev = input->dev.parent;
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struct input_absinfo *absinfo;
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unsigned int axis;
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unsigned int maximum, fuzz;
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unsigned int minimum, maximum, fuzz;
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bool data_present;
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input_alloc_absinfo(input);
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@ -77,7 +79,10 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
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return;
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axis = multitouch ? ABS_MT_POSITION_X : ABS_X;
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data_present = touchscreen_get_prop_u32(dev, "touchscreen-size-x",
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data_present = touchscreen_get_prop_u32(dev, "touchscreen-min-x",
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input_abs_get_min(input, axis),
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&minimum) |
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touchscreen_get_prop_u32(dev, "touchscreen-size-x",
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input_abs_get_max(input,
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axis) + 1,
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&maximum) |
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@ -85,10 +90,13 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
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input_abs_get_fuzz(input, axis),
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&fuzz);
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if (data_present)
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touchscreen_set_params(input, axis, maximum - 1, fuzz);
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touchscreen_set_params(input, axis, minimum, maximum - 1, fuzz);
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axis = multitouch ? ABS_MT_POSITION_Y : ABS_Y;
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data_present = touchscreen_get_prop_u32(dev, "touchscreen-size-y",
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data_present = touchscreen_get_prop_u32(dev, "touchscreen-min-y",
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input_abs_get_min(input, axis),
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&minimum) |
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touchscreen_get_prop_u32(dev, "touchscreen-size-y",
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input_abs_get_max(input,
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axis) + 1,
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&maximum) |
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@ -96,7 +104,7 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
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input_abs_get_fuzz(input, axis),
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&fuzz);
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if (data_present)
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touchscreen_set_params(input, axis, maximum - 1, fuzz);
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touchscreen_set_params(input, axis, minimum, maximum - 1, fuzz);
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axis = multitouch ? ABS_MT_PRESSURE : ABS_PRESSURE;
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data_present = touchscreen_get_prop_u32(dev,
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@ -108,7 +116,7 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
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input_abs_get_fuzz(input, axis),
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&fuzz);
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if (data_present)
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touchscreen_set_params(input, axis, maximum, fuzz);
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touchscreen_set_params(input, axis, 0, maximum, fuzz);
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if (!prop)
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return;
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@ -117,13 +125,25 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
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prop->max_x = input_abs_get_max(input, axis);
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prop->max_y = input_abs_get_max(input, axis + 1);
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prop->invert_x =
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device_property_read_bool(dev, "touchscreen-inverted-x");
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if (prop->invert_x) {
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absinfo = &input->absinfo[axis];
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absinfo->maximum -= absinfo->minimum;
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absinfo->minimum = 0;
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}
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prop->invert_y =
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device_property_read_bool(dev, "touchscreen-inverted-y");
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if (prop->invert_y) {
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absinfo = &input->absinfo[axis + 1];
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absinfo->maximum -= absinfo->minimum;
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absinfo->minimum = 0;
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}
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prop->swap_x_y =
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device_property_read_bool(dev, "touchscreen-swapped-x-y");
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if (prop->swap_x_y)
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swap(input->absinfo[axis], input->absinfo[axis + 1]);
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}
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