The X/Y position measurements read from the controller are interpreted
wrong. The first measurement X+ contains the Y position, and the second
measurement Y+ the X position (see also Table 11 Register Table in the
data sheet).
The problem is already known and a swap option has been introduced:
commit 6680884a4420 ("Input: ad7879 - add option to correct xy axis")
However, the meaning of the new boolean is inverted since the underlying
values are already swapped. Let ts->swap_xy set to true actually be the
swapped configuration of the two axis.
Signed-off-by: Stefan Agner <ste...@agner.ch>
---
Changes since v1:
- Keep axis swapped by default when using platform data
drivers/input/touchscreen/ad7879.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/input/touchscreen/ad7879.c
b/drivers/input/touchscreen/ad7879.c
index 93b8ea2..abd0220 100644
--- a/drivers/input/touchscreen/ad7879.c
+++ b/drivers/input/touchscreen/ad7879.c
@@ -94,8 +94,8 @@
#define AD7879_TEMP_BIT (1<<1)
enum {
- AD7879_SEQ_XPOS = 0,
- AD7879_SEQ_YPOS = 1,
+ AD7879_SEQ_YPOS = 0,
+ AD7879_SEQ_XPOS = 1,
AD7879_SEQ_Z1 = 2,
AD7879_SEQ_Z2 = 3,
AD7879_NR_SENSE = 4,
@@ -517,7 +517,9 @@ struct ad7879 *ad7879_probe(struct device *dev, u8 devid,
unsigned int irq,
ts->dev = dev;
ts->input = input_dev;
ts->irq = irq;
- ts->swap_xy = pdata->swap_xy;
+
+ /* Use swapped axis by default (backward compatibility) */
+ ts->swap_xy = !pdata->swap_xy;
setup_timer(&ts->timer, ad7879_timer, (unsigned long) ts);
--
2.7.0
