linux-kernel - Re: [PATCH v3 4/9] input: elants: override touchscreen info with DT properties

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Message-ID: <20200426051122.GQ125362@dtor-ws>
Date:   Sat, 25 Apr 2020 22:11:22 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     Dmitry Osipenko <digetx@...il.com>,
        Henrik Rydberg <rydberg@...math.org>,
        James Chen <james.chen@....com.tw>,
        Johnny Chuang <johnny.chuang@....com.tw>,
        Rob Herring <robh+dt@...nel.org>,
        Scott Liu <scott.liu@....com.tw>,
        David Heidelberg <david@...t.cz>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/9] input: elants: override touchscreen info with DT
 properties

On Mon, Apr 13, 2020 at 03:32:24PM +0200, Michał Mirosław wrote:
> Allow overriding of information from hardware and support additional
> common DT properties like axis inversion. This is required for eg.
> Nexus 7 and TF300T where the programmed values in firmware differ
> from reality.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> [moved "prop" before DMA buffer]
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>

This needs a companion patch for the DT bindings.

> ---
>  drivers/input/touchscreen/elants_i2c.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
> index fcd3d189f184..87d686ce08f2 100644
> --- a/drivers/input/touchscreen/elants_i2c.c
> +++ b/drivers/input/touchscreen/elants_i2c.c
> @@ -32,6 +32,7 @@
>  #include <linux/slab.h>
>  #include <linux/firmware.h>
>  #include <linux/input/mt.h>
> +#include <linux/input/touchscreen.h>
>  #include <linux/acpi.h>
>  #include <linux/of.h>
>  #include <linux/gpio/consumer.h>
> @@ -150,6 +151,7 @@ struct elants_data {
>  	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;
> @@ -894,8 +896,7 @@ 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);
>  
> @@ -1329,6 +1330,8 @@ static int elants_i2c_probe(struct i2c_client *client,
>  	input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res);
>  	input_abs_set_res(ts->input, ABS_MT_TOUCH_MAJOR, 1);
>  
> +	touchscreen_parse_properties(ts->input, true, &ts->prop);
> +
>  	error = input_register_device(ts->input);
>  	if (error) {
>  		dev_err(&client->dev,
> -- 
> 2.20.1
> 

-- 
Dmitry