Add abs setters for changing a single value on an abs axis

Changing a single value on an abs axis is slightly more common than
having to enable that axis outright. Provide a set of accessors for
doing so.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>

2 files changed, 76 insertions, 0 deletions

diff --git a/libevdev/libevdev.c b/libevdev/libevdev.c
index cdf338b..a17e388 100644
--- a/libevdev/libevdev.c
+++ b/libevdev/libevdev.c
@@ -821,6 +821,28 @@ ABS_GETTER(fuzz, fuzz)
 ABS_GETTER(flat, flat)
 ABS_GETTER(resolution, resolution)
 
+#define ABS_SETTER(field) \
+void libevdev_set_abs_##field(struct libevdev *dev, unsigned int code, int val) \
+{ \
+	if (!libevdev_has_event_code(dev, EV_ABS, code)) \
+		return; \
+	dev->abs_info[code].field = val; \
+}
+
+ABS_SETTER(maximum)
+ABS_SETTER(minimum)
+ABS_SETTER(fuzz)
+ABS_SETTER(flat)
+ABS_SETTER(resolution)
+
+void libevdev_set_abs_info(struct libevdev *dev, unsigned int code, const struct input_absinfo *abs)
+{
+	if (!libevdev_has_event_code(dev, EV_ABS, code))
+		return;
+
+	dev->abs_info[code] = *abs;
+}
+
 int
 libevdev_enable_event_type(struct libevdev *dev, unsigned int type)
 {
diff --git a/libevdev/libevdev.h b/libevdev/libevdev.h
index c8159ca..427bf39 100644
--- a/libevdev/libevdev.h
+++ b/libevdev/libevdev.h
@@ -845,6 +845,60 @@ int libevdev_get_current_slot(const struct libevdev *dev);
 /**
  * @ingroup kernel
  *
+ * Change the minimum for the given EV_ABS event code, if the code exists.
+ * This function has no effect if libevdev_has_event_code() returns false for
+ * this code.
+ */
+void libevdev_set_abs_minimum(struct libevdev *dev, unsigned int code, int min);
+
+/**
+ * @ingroup kernel
+ *
+ * Change the maximum for the given EV_ABS event code, if the code exists.
+ * This function has no effect if libevdev_has_event_code() returns false for
+ * this code.
+ */
+void libevdev_set_abs_maximum(struct libevdev *dev, unsigned int code, int max);
+
+/**
+ * @ingroup kernel
+ *
+ * Change the fuzz for the given EV_ABS event code, if the code exists.
+ * This function has no effect if libevdev_has_event_code() returns false for
+ * this code.
+ */
+void libevdev_set_abs_fuzz(struct libevdev *dev, unsigned int code, int fuzz);
+
+/**
+ * @ingroup kernel
+ *
+ * Change the flat for the given EV_ABS event code, if the code exists.
+ * This function has no effect if libevdev_has_event_code() returns false for
+ * this code.
+ */
+void libevdev_set_abs_flat(struct libevdev *dev, unsigned int code, int flat);
+
+/**
+ * @ingroup kernel
+ *
+ * Change the resolution for the given EV_ABS event code, if the code exists.
+ * This function has no effect if libevdev_has_event_code() returns false for
+ * this code.
+ */
+void libevdev_set_abs_resolution(struct libevdev *dev, unsigned int code, int resolution);
+
+/**
+ * @ingroup kernel
+ *
+ * Change the abs info for the given EV_ABS event code, if the code exists.
+ * This function has no effect if libevdev_has_event_code() returns false for
+ * this code.
+ */
+void libevdev_set_abs_info(struct libevdev *dev, unsigned int code, const struct input_absinfo *abs);
+
+/**
+ * @ingroup kernel
+ *
  * Forcibly enable an event type on this device, even if the underlying
  * device does not support it. While this cannot make the device actually
  * report such events, it will now return true for libevdev_has_event_type().