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author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2015-03-21 20:17:48 -0700 |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2015-03-24 12:00:39 -0700 |
commit | 3eea8b5d68c801fec788b411582b803463834752 (patch) | |
tree | f164f747c44980092ac997122320690f550f53cd /drivers/input/touchscreen/of_touchscreen.c | |
parent | 5037a17966967bde3f561cc543c9b3596afabf70 (diff) | |
download | linux-3eea8b5d68c801fec788b411582b803463834752.tar.bz2 |
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>
Diffstat (limited to 'drivers/input/touchscreen/of_touchscreen.c')
-rw-r--r-- | drivers/input/touchscreen/of_touchscreen.c | 50 |
1 files changed, 40 insertions, 10 deletions
diff --git a/drivers/input/touchscreen/of_touchscreen.c b/drivers/input/touchscreen/of_touchscreen.c index f8f9b84230b1..fe80d8ba7efa 100644 --- a/drivers/input/touchscreen/of_touchscreen.c +++ b/drivers/input/touchscreen/of_touchscreen.c @@ -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); |