From: Johnny Chuang <johnny.chuang.emc@gmail.com>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Benjamin Tissoires <benjamin.tissoires@redhat.com>,
Peter Hutterer <peter.hutterer@who-t.net>,
linux-kernel@vger.kernel.org, linux-input@vger.kernel.org,
Rob Schonberger <robsc@google.com>,
Johnny Chuang <johnny.chuang@emc.com.tw>
Cc: James Chen <james.chen@emc.com.tw>,
Jennifer Tsai <jennifer.tsai@emc.com.tw>,
Paul Liang <paul.liang@emc.com.tw>,
Jeff Chuang <jeff.chuang@emc.com.tw>
Subject: [PATCH] Input: elants_i2c - support palm detection
Date: Thu, 26 Mar 2020 15:58:45 +0800 [thread overview]
Message-ID: <1585209525-6047-1-git-send-email-johnny.chuang.emc@gmail.com> (raw)
From: Johnny Chuang <johnny.chuang@emc.com.tw>
Elan define finger/palm detection on the least significant bit of byte 33.
The default value is 1 for all firmwares, which report as MT_TOOL_FINGER.
If firmware support palm detection, the bit will change to 0 and
report as MT_TOOL_PALM when firmware detecting palm.
Signed-off-by: Johnny Chuang <johnny.chuang@emc.com.tw>
---
drivers/input/touchscreen/elants_i2c.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
index 14c577c..3b4d9eb3 100644
--- a/drivers/input/touchscreen/elants_i2c.c
+++ b/drivers/input/touchscreen/elants_i2c.c
@@ -73,6 +73,7 @@
#define FW_POS_STATE 1
#define FW_POS_TOTAL 2
#define FW_POS_XY 3
+#define FW_POS_TOOL_TYPE 33
#define FW_POS_CHECKSUM 34
#define FW_POS_WIDTH 35
#define FW_POS_PRESSURE 45
@@ -842,6 +843,7 @@ static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
{
struct input_dev *input = ts->input;
unsigned int n_fingers;
+ unsigned int tool_type;
u16 finger_state;
int i;
@@ -852,6 +854,12 @@ static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
dev_dbg(&ts->client->dev,
"n_fingers: %u, state: %04x\n", n_fingers, finger_state);
+ /* Note: all fingers have the same tool type */
+ if (buf[FW_POS_TOOL_TYPE] & 0x01)
+ tool_type = MT_TOOL_FINGER;
+ else
+ tool_type = MT_TOOL_PALM;
+
for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) {
if (finger_state & 1) {
unsigned int x, y, p, w;
@@ -867,7 +875,7 @@ static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
i, x, y, p, w);
input_mt_slot(input, i);
- input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
+ input_mt_report_slot_state(input, tool_type, true);
input_event(input, EV_ABS, ABS_MT_POSITION_X, x);
input_event(input, EV_ABS, ABS_MT_POSITION_Y, y);
input_event(input, EV_ABS, ABS_MT_PRESSURE, p);
@@ -1307,6 +1315,7 @@ static int elants_i2c_probe(struct i2c_client *client,
input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0);
input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
+ input_set_abs_params(ts->input, ABS_MT_TOOL_TYPE, 0, MT_TOOL_MAX, 0, 0);
input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res);
input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res);
input_abs_set_res(ts->input, ABS_MT_TOUCH_MAJOR, 1);
--
2.7.4
next reply other threads:[~2020-03-26 7:58 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-26 7:58 Johnny Chuang [this message]
2020-03-29 2:14 ` [PATCH] Input: elants_i2c - support palm detection Peter Hutterer
2020-03-30 0:59 ` Johnny.Chuang
2020-03-30 3:47 ` Peter Hutterer
2020-03-30 5:45 ` Johnny.Chuang
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