Commit ed7c9870 authored by Hans de Goede's avatar Hans de Goede Committed by Dmitry Torokhov

Input: of_touchscreen - add support for inverted / swapped axes

Extend touchscreen_parse_properties() with support for the
touchscreen-inverted-x/y and touchscreen-swapped-x-y properties and
add touchscreen_set_mt_pos() and touchscreen_report_pos() helper
functions for storing coordinates into a input_mt_pos struct, or
directly reporting them, taking these properties into account.

This commit also modifies the existing callers of
touchscreen_parse_properties() to pass in NULL for the new third
argument, keeping the existing behavior.
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 345ded8e
......@@ -595,7 +595,7 @@ struct ad7879 *ad7879_probe(struct device *dev, u8 devid, unsigned int irq,
} else {
input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0);
input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
touchscreen_parse_properties(input_dev, false);
touchscreen_parse_properties(input_dev, false, NULL);
if (!input_abs_get_max(input_dev, ABS_PRESSURE)) {
dev_err(dev, "Touchscreen pressure is not specified\n");
return ERR_PTR(-EINVAL);
......
......@@ -657,7 +657,7 @@ struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops,
input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X);
input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y);
touchscreen_parse_properties(input_dev, true);
touchscreen_parse_properties(input_dev, true, NULL);
error = input_mt_init_slots(input_dev, CY_MAX_ID, 0);
if (error) {
......
......@@ -972,7 +972,7 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
input_set_abs_params(input, ABS_MT_POSITION_Y,
0, tsdata->num_y * 64 - 1, 0, 0);
touchscreen_parse_properties(input, true);
touchscreen_parse_properties(input, true, NULL);
error = input_mt_init_slots(input, tsdata->max_support_points,
INPUT_MT_DIRECT);
......
......@@ -55,12 +55,16 @@ static void touchscreen_set_params(struct input_dev *dev,
* @input: input device that should be parsed
* @multitouch: specifies whether parsed properties should be applied to
* single-touch or multi-touch axes
* @prop: pointer to a struct touchscreen_properties into which to store
* axis swap and invert info for use with touchscreen_report_x_y();
* or %NULL
*
* This function parses common DT properties for touchscreens and setups the
* input device accordingly. The function keeps previously set up default
* values if no value is specified via DT.
*/
void touchscreen_parse_properties(struct input_dev *input, bool multitouch)
void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
struct touchscreen_properties *prop)
{
struct device *dev = input->dev.parent;
unsigned int axis;
......@@ -104,5 +108,80 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch)
&fuzz);
if (data_present)
touchscreen_set_params(input, axis, maximum, fuzz);
if (!prop)
return;
axis = multitouch ? ABS_MT_POSITION_X : ABS_X;
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");
prop->invert_y =
device_property_read_bool(dev, "touchscreen-inverted-y");
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]);
}
EXPORT_SYMBOL(touchscreen_parse_properties);
static void
touchscreen_apply_prop_to_x_y(const struct touchscreen_properties *prop,
unsigned int *x, unsigned int *y)
{
if (prop->invert_x)
*x = prop->max_x - *x;
if (prop->invert_y)
*y = prop->max_y - *y;
if (prop->swap_x_y)
swap(*x, *y);
}
/**
* touchscreen_set_mt_pos - Set input_mt_pos coordinates
* @pos: input_mt_pos to set coordinates of
* @prop: pointer to a struct touchscreen_properties
* @x: X coordinate to store in pos
* @y: Y coordinate to store in pos
*
* Adjust the passed in x and y values applying any axis inversion and
* swapping requested in the passed in touchscreen_properties and store
* the result in a struct input_mt_pos.
*/
void touchscreen_set_mt_pos(struct input_mt_pos *pos,
const struct touchscreen_properties *prop,
unsigned int x, unsigned int y)
{
touchscreen_apply_prop_to_x_y(prop, &x, &y);
pos->x = x;
pos->y = y;
}
EXPORT_SYMBOL(touchscreen_set_mt_pos);
/**
* touchscreen_report_pos - Report touchscreen coordinates
* @input: input_device to report coordinates for
* @prop: pointer to a struct touchscreen_properties
* @x: X coordinate to report
* @y: Y coordinate to report
* @multitouch: Report coordinates on single-touch or multi-touch axes
*
* Adjust the passed in x and y values applying any axis inversion and
* swapping requested in the passed in touchscreen_properties and then
* report the resulting coordinates on the input_dev's x and y axis.
*/
void touchscreen_report_pos(struct input_dev *input,
const struct touchscreen_properties *prop,
unsigned int x, unsigned int y,
bool multitouch)
{
touchscreen_apply_prop_to_x_y(prop, &x, &y);
input_report_abs(input, multitouch ? ABS_MT_POSITION_X : ABS_X, x);
input_report_abs(input, multitouch ? ABS_MT_POSITION_Y : ABS_Y, y);
}
EXPORT_SYMBOL(touchscreen_report_pos);
......@@ -515,7 +515,7 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
} else {
input_set_capability(input, EV_ABS, ABS_MT_POSITION_X);
input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y);
touchscreen_parse_properties(input, true);
touchscreen_parse_properties(input, true, NULL);
if (!input_abs_get_max(input, ABS_MT_POSITION_X) ||
!input_abs_get_max(input, ABS_MT_POSITION_Y)) {
dev_err(dev, "Touchscreen size is not specified\n");
......
......@@ -559,7 +559,7 @@ int tsc200x_probe(struct device *dev, int irq, __u16 bustype,
input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0);
if (np)
touchscreen_parse_properties(input_dev, false);
touchscreen_parse_properties(input_dev, false, NULL);
input_dev->open = tsc200x_open;
input_dev->close = tsc200x_close;
......
......@@ -10,7 +10,26 @@
#define _TOUCHSCREEN_H
struct input_dev;
struct input_mt_pos;
void touchscreen_parse_properties(struct input_dev *dev, bool multitouch);
struct touchscreen_properties {
unsigned int max_x;
unsigned int max_y;
bool invert_x;
bool invert_y;
bool swap_x_y;
};
void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
struct touchscreen_properties *prop);
void touchscreen_set_mt_pos(struct input_mt_pos *pos,
const struct touchscreen_properties *prop,
unsigned int x, unsigned int y);
void touchscreen_report_pos(struct input_dev *input,
const struct touchscreen_properties *prop,
unsigned int x, unsigned int y,
bool multitouch);
#endif
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