1 files changed, 35 insertions, 15 deletions

diff --git a/drivers/input/mouse/focaltech.c b/drivers/input/mouse/focaltech.c
index 757f78a94aec..23d259416f2f 100644
--- a/drivers/input/mouse/focaltech.c
+++ b/drivers/input/mouse/focaltech.c
@@ -67,9 +67,6 @@ static void focaltech_reset(struct psmouse *psmouse)
 
 #define FOC_MAX_FINGERS 5
 
-#define FOC_MAX_X 2431
-#define FOC_MAX_Y 1663
-
 /*
  * Current state of a single finger on the touchpad.
  */
@@ -129,9 +126,17 @@ static void focaltech_report_state(struct psmouse *psmouse)
                 input_mt_slot(dev, i);
                 input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
                 if (active) {
-                        input_report_abs(dev, ABS_MT_POSITION_X, finger->x);
+                        unsigned int clamped_x, clamped_y;
+                        /*
+                         * The touchpad might report invalid data, so we clamp
+                         * the resulting values so that we do not confuse
+                         * userspace.
+                         */
+                        clamped_x = clamp(finger->x, 0U, priv->x_max);
+                        clamped_y = clamp(finger->y, 0U, priv->y_max);
+                        input_report_abs(dev, ABS_MT_POSITION_X, clamped_x);
                         input_report_abs(dev, ABS_MT_POSITION_Y,
-                                         FOC_MAX_Y - finger->y);
+                                         priv->y_max - clamped_y);
                 }
         }
         input_mt_report_pointer_emulation(dev, true);
@@ -180,16 +185,6 @@ static void focaltech_process_abs_packet(struct psmouse *psmouse,
 
         state->pressed = (packet[0] >> 4) & 1;
 
-        /*
-         * packet[5] contains some kind of tool size in the most
-         * significant nibble. 0xff is a special value (latching) that
-         * signals a large contact area.
-         */
-        if (packet[5] == 0xff) {
-                state->fingers[finger].valid = false;
-                return;
-        }
-
         state->fingers[finger].x = ((packet[1] & 0xf) << 8) | packet[2];
         state->fingers[finger].y = (packet[3] << 8) | packet[4];
         state->fingers[finger].valid = true;
@@ -381,6 +376,23 @@ static int focaltech_read_size(struct psmouse *psmouse)
 
         return 0;
 }
+
+void focaltech_set_resolution(struct psmouse *psmouse, unsigned int resolution)
+{
+        /* not supported yet */
+}
+
+static void focaltech_set_rate(struct psmouse *psmouse, unsigned int rate)
+{
+        /* not supported yet */
+}
+
+static void focaltech_set_scale(struct psmouse *psmouse,
+                                enum psmouse_scale scale)
+{
+        /* not supported yet */
+}
+
 int focaltech_init(struct psmouse *psmouse)
 {
         struct focaltech_data *priv;
@@ -415,6 +427,14 @@ int focaltech_init(struct psmouse *psmouse)
         psmouse->cleanup = focaltech_reset;
         /* resync is not supported yet */
         psmouse->resync_time = 0;
+        /*
+         * rate/resolution/scale changes are not supported yet, and
+         * the generic implementations of these functions seem to
+         * confuse some touchpads
+         */
+        psmouse->set_resolution = focaltech_set_resolution;
+        psmouse->set_rate = focaltech_set_rate;
+        psmouse->set_scale = focaltech_set_scale;
 
         return 0;