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Input: of_touchscreen - rework the DT parsing function 

The DT parsing function currently duplicates a lot of the code to parse the
touchscreen DT properties. In order to ease further additions to this
parsing routine, rework it slightly to create new helper functions.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Maxime Ripard 2015-03-21 20:17:48 -07:00 committed by Dmitry Torokhov
parent 5037a17966
commit 3eea8b5d68
1 changed files with 40 additions and 10 deletions
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50
drivers/input/touchscreen/of_touchscreen.c
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@ -13,6 +13,33 @@
#include <linux/input.h>
#include <linux/input/touchscreen.h>
static u32 of_get_optional_u32(struct device_node *np,
const char *property)
{
u32 val = 0;
of_property_read_u32(np, property, &val);
return val;
}
static void touchscreen_set_params(struct input_dev *dev,
unsigned long axis,
int max, int fuzz)
{
struct input_absinfo *absinfo;
if (!test_bit(axis, dev->absbit)) {
dev_warn(&dev->dev,
"DT specifies parameters but the axis is not set up\n");
return;
}
absinfo = &dev->absinfo[axis];
absinfo->maximum = max;
absinfo->fuzz = fuzz;
}
/**
* touchscreen_parse_of_params - parse common touchscreen DT properties
* @dev: device that should be parsed
@ -24,22 +51,25 @@
void touchscreen_parse_of_params(struct input_dev *dev)
{
struct device_node *np = dev->dev.parent->of_node;
struct input_absinfo *absinfo;
u32 maximum, fuzz;
input_alloc_absinfo(dev);
if (!dev->absinfo)
return;
absinfo = &dev->absinfo[ABS_X];
of_property_read_u32(np, "touchscreen-size-x", &absinfo->maximum);
of_property_read_u32(np, "touchscreen-fuzz-x", &absinfo->fuzz);
maximum = of_get_optional_u32(np, "touchscreen-size-x");
fuzz = of_get_optional_u32(np, "touchscreen-fuzz-x");
if (maximum || fuzz)
touchscreen_set_params(dev, ABS_X, maximum, fuzz);
absinfo = &dev->absinfo[ABS_Y];
of_property_read_u32(np, "touchscreen-size-y", &absinfo->maximum);
of_property_read_u32(np, "touchscreen-fuzz-y", &absinfo->fuzz);
maximum = of_get_optional_u32(np, "touchscreen-size-y");
fuzz = of_get_optional_u32(np, "touchscreen-fuzz-y");
if (maximum || fuzz)
touchscreen_set_params(dev, ABS_Y, maximum, fuzz);
absinfo = &dev->absinfo[ABS_PRESSURE];
of_property_read_u32(np, "touchscreen-max-pressure", &absinfo->maximum);
of_property_read_u32(np, "touchscreen-fuzz-pressure", &absinfo->fuzz);
maximum = of_get_optional_u32(np, "touchscreen-max-pressure");
fuzz = of_get_optional_u32(np, "touchscreen-fuzz-pressure");
if (maximum || fuzz)
touchscreen_set_params(dev, ABS_PRESSURE, maximum, fuzz);
}
EXPORT_SYMBOL(touchscreen_parse_of_params);