linux-kernel - Re: [PATCH 3/6] input: elants: support common touchscreen DT properties

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Date:   Tue, 10 Dec 2019 04:07:38 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        linux-input@...r.kernel.org
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] input: elants: support common touchscreen DT
 properties

10.12.2019 04:03, Dmitry Osipenko пишет:
> 10.12.2019 03:19, Michał Mirosław пишет:
>> Support common DT properties like axis inversions to complement
>> information obtained from device's firmware.
>>
>> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
>> ---
>>  drivers/input/touchscreen/elants_i2c.c | 27 ++++++++++++++------------
>>  1 file changed, 15 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
>> index eadd26d5a06f..02bd5e3e2171 100644
>> --- a/drivers/input/touchscreen/elants_i2c.c
>> +++ b/drivers/input/touchscreen/elants_i2c.c
>> @@ -31,6 +31,7 @@
>>  #include <linux/buffer_head.h>
>>  #include <linux/slab.h>
>>  #include <linux/firmware.h>
>> +#include <linux/input/touchscreen.h>
>>  #include <linux/input/mt.h>
>>  #include <linux/acpi.h>
>>  #include <linux/of.h>
>> @@ -146,8 +147,7 @@ struct elants_data {
>>  	u16 hw_version;
>>  	unsigned int x_res;	/* resolution in units/mm */
>>  	unsigned int y_res;
>> -	unsigned int x_max;
>> -	unsigned int y_max;
>> +	struct touchscreen_properties prop;
>>  
>>  	enum elants_state state;
>>  	enum elants_iap_mode iap_mode;
>> @@ -498,10 +498,10 @@ static int elants_i2c_query_ts_info(struct elants_data *ts)
>>  			 rows, cols, osr);
>>  	} else {
>>  		/* translate trace number to TS resolution */
>> -		ts->x_max = ELAN_TS_RESOLUTION(rows, osr);
>> -		ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x);
>> -		ts->y_max = ELAN_TS_RESOLUTION(cols, osr);
>> -		ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y);
>> +		ts->prop.max_x = ELAN_TS_RESOLUTION(rows, osr);
>> +		ts->x_res = DIV_ROUND_CLOSEST(ts->prop.max_x, phy_x);
>> +		ts->prop.max_y = ELAN_TS_RESOLUTION(cols, osr);
>> +		ts->y_res = DIV_ROUND_CLOSEST(ts->prop.max_y, phy_y);
>>  	}
>>  
>>  	return 0;
>> @@ -833,8 +833,7 @@ static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf,
>>  
>>  			input_mt_slot(input, i);
>>  			input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
>> -			input_event(input, EV_ABS, ABS_MT_POSITION_X, x);
>> -			input_event(input, EV_ABS, ABS_MT_POSITION_Y, y);
>> +			touchscreen_report_pos(input, &ts->prop, x, y, true);
>>  			input_event(input, EV_ABS, ABS_MT_PRESSURE, p);
>>  			input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w);
>>  
>> @@ -1251,13 +1250,15 @@ static int elants_i2c_probe(struct i2c_client *client,
>>  	ts->input->name = "Elan Touchscreen";
>>  	ts->input->id.bustype = BUS_I2C;
>>  
>> +	touchscreen_parse_properties(ts->input, true, &ts->prop);
> 
> Shouldn't this function be invoked after setting the max x/y sizes with
> the hardware values? That's what all other drivers do and then you won't
> need to set the ts->prop.max_x/y above in the code.


>>  	__set_bit(BTN_TOUCH, ts->input->keybit);
>>  	__set_bit(EV_ABS, ts->input->evbit);
>>  	__set_bit(EV_KEY, ts->input->evbit);
>>  
>>  	/* Single touch input params setup */
>> -	input_set_abs_params(ts->input, ABS_X, 0, ts->x_max, 0, 0);
>> -	input_set_abs_params(ts->input, ABS_Y, 0, ts->y_max, 0, 0);
>> +	input_set_abs_params(ts->input, ABS_X, 0, ts->prop.max_x, 0, 0);
>> +	input_set_abs_params(ts->input, ABS_Y, 0, ts->prop.max_y, 0, 0);
>>  	input_set_abs_params(ts->input, ABS_PRESSURE, 0, 255, 0, 0);
>>  	input_abs_set_res(ts->input, ABS_X, ts->x_res);
>>  	input_abs_set_res(ts->input, ABS_Y, ts->y_res);

I'm actually wondering why this part is needed at all, the driver
doesn't report single-touch events.

>> @@ -1271,8 +1272,10 @@ static int elants_i2c_probe(struct i2c_client *client,
>>  		return error;
>>  	}
>>  
>> -	input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0);
>> -	input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0);
>> +	input_set_abs_params(ts->input, ABS_MT_POSITION_X,
>> +			     0, ts->prop.max_x, 0, 0);
>> +	input_set_abs_params(ts->input, ABS_MT_POSITION_Y,
>> +			     0, ts->prop.max_y, 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_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res);
>>
>