Added device-tree flags "ti,invert_x" and "ti,invert_y" to specify
inversion of X and/or Y axes respectively.
Signed-off-by: David Jander <david@xxxxxxxxxxx>
---
.../bindings/input/touchscreen/ads7846.txt | 2 ++
drivers/input/touchscreen/ads7846.c | 12 ++++++++++++
include/linux/spi/ads7846.h | 2 ++
3 files changed, 16 insertions(+)
diff --git a/Documentation/devicetree/bindings/input/touchscreen/ads7846.txt b/Documentation/devicetree/bindings/input/touchscreen/ads7846.txt
index 04413da51391..946f4fd0133e 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/ads7846.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/ads7846.txt
@@ -33,6 +33,8 @@ Optional properties:
ti,keep-vref-on set to keep vref on for differential
measurements as well
ti,swap-xy swap x and y axis
+ ti,invert_x invert x axis
+ ti,invert_y invert y axis
ti,settle-delay-usec Settling time of the analog signals;
a function of Vcc and the capacitance
on the X/Y drivers. If set to non-zero,
diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index a2f45aefce08..b853e889c6ec 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -111,6 +111,8 @@ struct ads7846 {
u16 pressure_max;
bool swap_xy;
+ bool invert_x;
+ bool invert_y;
bool use_internal;
struct ads7846_packet *packet;
@@ -829,6 +831,12 @@ static void ads7846_report_state(struct ads7846 *ts)
if (ts->swap_xy)
swap(x, y);
+ if (ts->invert_x)
+ x = MAX_12BIT - x;
+
+ if (ts->invert_y)
+ y = MAX_12BIT - y;
+
if (!ts->pendown) {
input_report_key(input, BTN_TOUCH, 1);
ts->pendown = true;
@@ -1212,6 +1220,8 @@ static const struct ads7846_platform_data *ads7846_probe_dt(struct device *dev)
pdata->keep_vref_on = of_property_read_bool(node, "ti,keep-vref-on");
pdata->swap_xy = of_property_read_bool(node, "ti,swap-xy");
+ pdata->invert_x = of_property_read_bool(node, "ti,invert_x");
+ pdata->invert_y = of_property_read_bool(node, "ti,invert_y");
of_property_read_u16(node, "ti,settle-delay-usec",
&pdata->settle_delay_usecs);
@@ -1316,6 +1326,8 @@ static int ads7846_probe(struct spi_device *spi)
ts->vref_mv = pdata->vref_mv;
ts->swap_xy = pdata->swap_xy;
+ ts->invert_x = pdata->invert_x;
+ ts->invert_y = pdata->invert_y;
if (pdata->filter != NULL) {
if (pdata->filter_init != NULL) {
diff --git a/include/linux/spi/ads7846.h b/include/linux/spi/ads7846.h
index 1a5eaef3b7f2..6b8022c625a3 100644
--- a/include/linux/spi/ads7846.h
+++ b/include/linux/spi/ads7846.h
@@ -20,6 +20,8 @@ struct ads7846_platform_data {
bool keep_vref_on; /* set to keep vref on for differential
* measurements as well */
bool swap_xy; /* swap x and y axes */
+ bool invert_x; /* Invert x axis */
+ bool invert_y; /* Invert y axis */
/* Settling time of the analog signals; a function of Vcc and the
* capacitance on the X/Y drivers. If set to non-zero, two samples
--
2.19.1
