> -----Original Message----- > From: Peter Hutterer [mailto:peter.hutterer@xxxxxxxxx] > Sent: Sunday, March 29, 2020 10:15 AM > To: Johnny Chuang > Cc: Dmitry Torokhov; Benjamin Tissoires; linux-kernel@xxxxxxxxxxxxxxx; > linux-input@xxxxxxxxxxxxxxx; Rob Schonberger; Johnny Chuang; James Chen; > Jennifer Tsai; Paul Liang; Jeff Chuang > Subject: Re: [PATCH] Input: elants_i2c - support palm detection > > On Thu, Mar 26, 2020 at 03:58:45PM +0800, Johnny Chuang wrote: > > From: Johnny Chuang <johnny.chuang@xxxxxxxxxx> > > > > 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@xxxxxxxxxx> > > --- > > 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); > > if you're only reporting pen and palm, can we set this to MT_TOOL_PALM > instead? Otherwise you're indicating you may also send MT_TOOL_DIAL which > is unlikely on this hardware :) > Yes, we do not have MT_TOOL_DIAL on touch screen. So I need to modify MT_TOOL_MAX to MT_TOOL_PALM, right? > Reviewed-by: Peter Hutterer <peter.hutterer@xxxxxxxxx> otherwise > > Cheers, > Peter > > > 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 > >
