[PATCH synaptics] Disable driver scaling for input ABI 19.2

[Peter Hutterer]

For absolute devices in relative mode, i.e. touchpads, the server now takes
device resolution into account. Doing so means that the driver mustn't
scale, so we deactivate those bits in the driver.

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
 src/synaptics.c    |  9 +++++++++
 src/synapticsstr.h | 12 ++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/src/synaptics.c b/src/synaptics.c
index eb38271..e391a98 100644
--- a/src/synaptics.c
+++ b/src/synaptics.c
@@ -133,9 +133,11 @@ static int DeviceOff(DeviceIntPtr);
 static int DeviceClose(DeviceIntPtr);
 static Bool QueryHardware(InputInfoPtr);
 static void ReadDevDimensions(InputInfoPtr);
+#ifndef NO_DRIVER_SCALING
 static void ScaleCoordinates(SynapticsPrivate * priv,
                              struct SynapticsHwState *hw);
 static void CalculateScalingCoeffs(SynapticsPrivate * priv);
+#endif
 static void SanitizeDimensions(InputInfoPtr pInfo);
 
 void InitDeviceProperties(InputInfoPtr pInfo);
@@ -829,7 +831,10 @@ SynapticsPreInit(InputDriverPtr drv, InputInfoPtr pInfo, int flags)
 
     set_default_parameters(pInfo);
 
+#ifndef NO_DRIVER_SCALING
     CalculateScalingCoeffs(priv);
+#endif
+
 
     priv->comm.buffer = XisbNew(pInfo->fd, INPUT_BUFFER_SIZE);
 
@@ -2863,7 +2868,9 @@ HandleState(InputInfoPtr pInfo, struct SynapticsHwState *hw, CARD32 now,
          * calculations that require unadjusted coordinates, for example edge
          * detection.
          */
+#ifndef NO_DRIVER_SCALING
         ScaleCoordinates(priv, hw);
+#endif
     }
 
     dx = dy = 0;
@@ -2987,6 +2994,7 @@ QueryHardware(InputInfoPtr pInfo)
     return TRUE;
 }
 
+#ifndef NO_DRIVER_SCALING
 static void
 ScaleCoordinates(SynapticsPrivate * priv, struct SynapticsHwState *hw)
 {
@@ -3016,3 +3024,4 @@ CalculateScalingCoeffs(SynapticsPrivate * priv)
         priv->vert_coeff = 1;
     }
 }
+#endif
diff --git a/src/synapticsstr.h b/src/synapticsstr.h
index 428befa..6c0ee52 100644
--- a/src/synapticsstr.h
+++ b/src/synapticsstr.h
@@ -28,6 +28,14 @@
 #define LogMessageVerbSigSafe xf86MsgVerb
 #endif
 
+#if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 19
+#if GET_ABI_MINOR(ABI_XINPUT_VERSION) >= 2
+/* as of 19.2, the server takes device resolution into account when scaling
+   relative events from abs device, so we must not scale in synaptics. */
+#define NO_DRIVER_SCALING 1
+#endif
+#endif
+
 #ifdef DBG
 #undef DBG
 #endif
@@ -250,8 +260,10 @@ struct _SynapticsPrivateRec {
     int prev_z;                 /* previous z value, for palm detection */
     int prevFingers;            /* previous numFingers, for transition detection */
     int avg_width;              /* weighted average of previous fingerWidth values */
+#ifndef NO_DRIVER_SCALING
     double horiz_coeff;         /* normalization factor for x coordintes */
     double vert_coeff;          /* normalization factor for y coordintes */
+#endif
 
     int minx, maxx, miny, maxy; /* min/max dimensions as detected */
     int minp, maxp, minw, maxw; /* min/max pressure and finger width as detected */
-- 
1.8.2.1