linux-kernel - [PATCH] Input: Change BTN_TOOL_FINGER falg when HOVER event trigger

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Date:	Wed, 30 Mar 2016 10:02:02 +0800
From:	"DusonLin" <dusonlin@....com.tw>
To:	"'Dmitry Torokhov'" <dmitry.torokhov@...il.com>,
	<Linux-kernel@...r.kernel.org>, <linux-input@...r.kernel.org>
Cc:	"'Charles Mooney'" <charliemooney@...gle.com>,
	"'jeff'" <jeff.chuang@....com.tw>, "'Phoenix'" <phoenix@....com.tw>
Subject:  [PATCH] Input: Change BTN_TOOL_FINGER falg when HOVER event trigger

Only ABS_DISTANCE is not enough for upper OS  to distiguish hover event
be triggered from object form faraway to and close touchpad surface or from
object prepare to leave the touchpad surface. We add BNT_TOOL_FINGER to help
it.

                 Object_at_faraway   object_at_hover_area  object_touch_touchpad
      BTN_TOUCH         0                      0                    1
BTN_TOOL_FINGER         0                      1                    1
   ABS_DISTANCE         0                      1                    0

Signed-off by: Duson Lin <dusonlin@....com.tw>
---
drivers/input/mouse/elan_i2c_core.c |   14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan_i2c_core.c
index 2f58985..9392a8c 100644
--- a/drivers/input/mouse/elan_i2c_core.c
+++ b/drivers/input/mouse/elan_i2c_core.c
@@ -4,7 +4,7 @@
  * Copyright (c) 2013 ELAN Microelectronics Corp.
  *
  * Author: 林政維 (Duson Lin) <dusonlin@....com.tw>
- * Version: 1.6.0
+ * Version: 1.6.1
  *
  * Based on cyapa driver:
  * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
@@ -845,23 +845,27 @@ static void elan_report_absolute(struct elan_tp_data *data, u8 *packet)
{
      struct input_dev *input = data->input;
      u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
-       int i;
+      int i, valid_count = 0;
      u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
      u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
      bool contact_valid, hover_event;

-       hover_event = hover_info & 0x40;
+      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);

-               if (contact_valid)
+              if (contact_valid) {
                      finger_data += ETP_FINGER_DATA_LEN;
+                      valid_count++;
+              }
      }

       input_report_key(input, BTN_LEFT, tp_info & 0x01);
+      input_report_key(input, BTN_TOOL_FINGER,
+                      ((hover_event != 0) | (valid_count > 0)));
      input_report_abs(input, ABS_DISTANCE, hover_event != 0);
-       input_mt_report_pointer_emulation(input, true);
+      input_mt_report_pointer_emulation(input, false);
      input_sync(input);
}

-- 
1.7.9.5