Input: elan_i2c - report hovering contacts

When hover is detected report ABS_MT_DISTANCE as 1; for active contacts
the distance is reported as 0.

Signed-off-by: Duson Lin <dusonlin@emc.com.tw>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 11 insertions, 4 deletions

diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan_i2c_core.c
index 22f38521c083..fd5068b2542d 100644
--- a/drivers/input/mouse/elan_i2c_core.c
+++ b/drivers/input/mouse/elan_i2c_core.c
@@ -52,6 +52,7 @@
 #define ETP_REPORT_ID_OFFSET    2
 #define ETP_TOUCH_INFO_OFFSET   3
 #define ETP_FINGER_DATA_OFFSET  4
+#define ETP_HOVER_INFO_OFFSET   30
 #define ETP_MAX_REPORT_LEN      34
 
 /* The main device structure */
@@ -725,7 +726,7 @@ static const struct attribute_group *elan_sysfs_groups[] = {
  */
 static void elan_report_contact(struct elan_tp_data *data,
                                 int contact_num, bool contact_valid,
-                                u8 *finger_data)
+                                bool hover_event, u8 *finger_data)
 {
         struct input_dev *input = data->input;
         unsigned int pos_x, pos_y;
@@ -769,7 +770,9 @@ static void elan_report_contact(struct elan_tp_data *data,
                 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
                 input_report_abs(input, ABS_MT_POSITION_X, pos_x);
                 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
-                input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
+                input_report_abs(input, ABS_MT_DISTANCE, hover_event);
+                input_report_abs(input, ABS_MT_PRESSURE,
+                                 hover_event ? 0 : scaled_pressure);
                 input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
                 input_report_abs(input, ABS_MT_TOUCH_MAJOR, major);
                 input_report_abs(input, ABS_MT_TOUCH_MINOR, minor);
@@ -785,11 +788,14 @@ static void elan_report_absolute(struct elan_tp_data *data, u8 *packet)
         u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
         int i;
         u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
-        bool contact_valid;
+        u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
+        bool contact_valid, hover_event;
 
+        hover_event = hover_info & 0x40;
         for (i = 0; i < ETP_MAX_FINGERS; i++) {
                 contact_valid = tp_info & (1U << (3 + i));
-                elan_report_contact(data, i, contact_valid, finger_data);
+                elan_report_contact(data, i, contact_valid, hover_event,
+                                    finger_data);
 
                 if (contact_valid)
                         finger_data += ETP_FINGER_DATA_LEN;
@@ -883,6 +889,7 @@ static int elan_setup_input_device(struct elan_tp_data *data)
                              ETP_FINGER_WIDTH * max_width, 0, 0);
         input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0,
                              ETP_FINGER_WIDTH * min_width, 0, 0);
+        input_set_abs_params(input, ABS_MT_DISTANCE, 0, 1, 0, 0);
 
         data->input = input;