commit b98abe52fa8e ("Input: add common DT binding for touchscreens")
introduced common DT bindings for touchscreens [1] and a helper function to
parse the DT.
This has been integrated and interpretation of the inversion (flipping)
properties for the x and y axis has been added to accommodate any
orientation of the touch in relation to the LCD.
By scaling the min/max ADC values to the screen size it is now possible to
pre-calibrate the touch so that is (almost) exactly matches the LCD it is
glued onto. This allows to well enough operate the touch before a user
space calibration can improve the precision.
calculate_pressure has been renamed to calculate_resistance because
that is what it is doing.
[1]: Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
Signed-off-by: H. Nikolaus Schaller
---
.../bindings/input/touchscreen/tsc2007.txt | 20 +--
drivers/input/touchscreen/tsc2007.c| 135 +
include/linux/i2c/tsc2007.h| 8 ++
3 files changed, 135 insertions(+), 28 deletions(-)
diff --git a/Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt
b/Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt
index ec365e1..6e9fd55 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt
@@ -6,6 +6,7 @@ Required properties:
- ti,x-plate-ohms: X-plate resistance in ohms.
Optional properties:
+- generic touch screen properties: see touchscreen binding [2].
- gpios: the interrupt gpio the chip is connected to (trough the penirq pin).
The penirq pin goes to low when the panel is touched.
(see GPIO binding[1] for more details).
@@ -13,17 +14,20 @@ Optional properties:
(see interrupt binding[0]).
- interrupts: (gpio) interrupt to which the chip is connected
(see interrupt binding[0]).
-- ti,max-rt: maximum pressure.
-- ti,fuzzx: specifies the absolute input fuzz x value.
- If set, it will permit noise in the data up to +- the value given to the fuzz
- parameter, that is used to filter noise from the event stream.
-- ti,fuzzy: specifies the absolute input fuzz y value.
-- ti,fuzzz: specifies the absolute input fuzz z value.
+- ti,max-rt: maximum pressure resistance above which samples are ignored
+ (default: 4095).
+- ti,report-resistance: report resistance (no pressure = max_rt) instead
+ of pressure (no pressure = 0).
+- ti,min-x: minimum value reported by X axis ADC (default 0).
+- ti,max-x: maximum value reported by X axis ADC (default 4095).
+- ti,min-y: minimum value reported by Y axis ADC (default 0).
+- ti,max-y: maximum value reported by Y axis ADC (default 4095).
- ti,poll-period: how much time to wait (in milliseconds) before reading again
the
- values from the tsc2007.
+ values from the tsc2007 (default 1).
[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
[1]: Documentation/devicetree/bindings/gpio/gpio.txt
+[2]: Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
Example:
{
@@ -35,6 +39,8 @@ Example:
interrupts = <0x0 0x8>;
gpios = < 0 0>;
ti,x-plate-ohms = <180>;
+ touchscreen-size-x = <640>;
+ touchscreen-size-y = <480>;
};
/* ... */
diff --git a/drivers/input/touchscreen/tsc2007.c
b/drivers/input/touchscreen/tsc2007.c
index 5d0cd51..e0c7173 100644
--- a/drivers/input/touchscreen/tsc2007.c
+++ b/drivers/input/touchscreen/tsc2007.c
@@ -29,6 +29,7 @@
#include
#include
#include
+#include
#define TSC2007_MEASURE_TEMP0 (0x0 << 4)
#define TSC2007_MEASURE_AUX(0x2 << 4)
@@ -74,6 +75,14 @@ struct tsc2007 {
u16 model;
u16 x_plate_ohms;
+ boolswap_xy;
+ boolinvert_x;
+ boolinvert_y;
+ boolreport_resistance;
+ u16 min_x;
+ u16 min_y;
+ u16 max_x;
+ u16 max_y;
u16 max_rt;
unsigned long poll_period; /* in jiffies */
int fuzzx;
@@ -128,7 +137,8 @@ static void tsc2007_read_values(struct tsc2007 *tsc, struct
ts_event *tc)
tsc2007_xfer(tsc, PWRDOWN);
}
-static u32 tsc2007_calculate_pressure(struct tsc2007 *tsc, struct ts_event *tc)
+static u32 tsc2007_calculate_resistance(struct tsc2007 *tsc,
+ struct ts_event *tc)
{
u32 rt = 0;
@@ -177,12 +187,13 @@ static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
struct ts_event tc;
u32 rt;
+ dev_dbg(>client->dev, "soft irq %d\n", irq);
while (!ts->stopped &&
