[PATCH 1/7] of_touchscreen-helpers: Add support for inverted / swapped axis

Hans de Goede
2015-11-20T11:17:07Z

Extend touchscreen_parse_properties() with support for the
touchscreen-inverted-x/y and touchscreen-swapped-x-y properties and
add a touchscreen_apply_prop_to_x_y() helper function for adjusting
x and y coordinates to take 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: Hans de Goede <hdegoede@redhat.com>
---
drivers/input/touchscreen/edt-ft5x06.c | 2 +-
drivers/input/touchscreen/of_touchscreen.c | 56 +++++++++++++++++++++++++++++-
drivers/input/touchscreen/pixcir_i2c_ts.c | 2 +-
drivers/input/touchscreen/tsc200x-core.c | 2 +-
include/linux/input/touchscreen.h | 16 ++++++++-
5 files changed, 73 insertions(+), 5 deletions(-)

diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
index 0b0f8c1..a97b54a 100644
--- a/drivers/input/touchscreen/edt-ft5x06.c
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -966,7 +966,7 @@ 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);
diff --git a/drivers/input/touchscreen/of_touchscreen.c b/drivers/input/touchscreen/of_touchscreen.c
index bb6f2fe..6fd9872 100644
--- a/drivers/input/touchscreen/of_touchscreen.c
+++ b/drivers/input/touchscreen/of_touchscreen.c
@@ -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 +108,55 @@ 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) {
+ struct input_absinfo tmp_absinfo;
+
+ tmp_absinfo = input->absinfo[axis];
+ input->absinfo[axis] = input->absinfo[axis + 1];
+ input->absinfo[axis + 1] = tmp_absinfo;
+ }
}
EXPORT_SYMBOL(touchscreen_parse_properties);
+
+/**
+ * touchscreen_apply_prop_to_x_y - Adjust abs x and y coordinates
+ * @prop: pointer to a struct touchscreen_properties
+ * @x: X coordinate to apply inversion and swapping to
+ * @y: Y coordinate to apply inversion and swapping to
+ *
+ * Adjust the passed in x and y values applying any axis inversion and
+ * swapping requested in the passed in touchscreen_properties.
+ */
+void touchscreen_apply_prop_to_x_y(struct touchscreen_properties *prop,
+ s16 *x, s16 *y)
+{
+ if (prop->invert_x)
+ *x = prop->max_x - *x;
+
+ if (prop->invert_y)
+ *y = prop->max_y - *y;
+
+ if (prop->swap_x_y) {
+ s16 tmp;
+
+ tmp = *x;
+ *x = *y;
+ *y = tmp;
+ }
+}
+EXPORT_SYMBOL(touchscreen_apply_prop_to_x_y);
diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
index 4b961ad..211408c 100644
--- a/drivers/input/touchscreen/pixcir_i2c_ts.c
+++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
@@ -495,7 +495,7 @@ 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");
diff --git a/drivers/input/touchscreen/tsc200x-core.c b/drivers/input/touchscreen/tsc200x-core.c
index 15240c1..26e81d1 100644
--- a/drivers/input/touchscreen/tsc200x-core.c
+++ b/drivers/input/touchscreen/tsc200x-core.c
@@ -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;
diff --git a/include/linux/input/touchscreen.h b/include/linux/input/touchscreen.h
index c91e137..9e6ba20 100644
--- a/include/linux/input/touchscreen.h
+++ b/include/linux/input/touchscreen.h
@@ -9,8 +9,22 @@
#ifndef _TOUCHSCREEN_H
#define _TOUCHSCREEN_H

+#include <asm/types.h>
+
struct input_dev;

-void touchscreen_parse_properties(struct input_dev *dev, bool multitouch);
+struct touchscreen_properties {
+ s32 max_x;
+ s32 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_apply_prop_to_x_y(struct touchscreen_properties *prop,
+ s16 *x, s16 *y);

#endif
--
2.5.0