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Message-Id: <1454111295-5615-2-git-send-email-stefan@agner.ch>
Date: Fri, 29 Jan 2016 15:48:14 -0800
From: Stefan Agner <stefan@...er.ch>
To: dmitry.torokhov@...il.com, michael.hennerich@...log.com,
robh+dt@...nel.org
Cc: mark.rutland@....com, ijc+devicetree@...lion.org.uk,
galak@...eaurora.org, realmz6@...il.com, broonie@...nel.org,
jic23@...nel.org, linux-input@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Stefan Agner <stefan@...er.ch>
Subject: [PATCH v2 2/3] input: touchscreen: ad7879: fix default x/y axis assignment
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 <stefan@...er.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
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