linux-kernel - Re: [PATCH v3 1/4] Input: Add driver for Cypress Generation 5 touchscreen

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Date:   Sat, 4 Dec 2021 23:32:33 +0100
From:   Andreas Kemnade <andreas@...nade.info>
To:     Alistair Francis <alistair@...stair23.me>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-input@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        robh+dt@...nel.org, alistair23@...il.com,
        dmitry.torokhov@...il.com, linus.walleij@...aro.org,
        rydberg@...math.org,
        Mylène Josserand <mylene.josserand@...tlin.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>
Subject: Re: [PATCH v3 1/4] Input: Add driver for Cypress Generation 5
 touchscreen

Hi,


On Thu,  2 Dec 2021 22:20:18 +1000
Alistair Francis <alistair@...stair23.me> wrote:

> From: Mylène Josserand <mylene.josserand@...tlin.com>
> 
> This is the basic driver for the Cypress TrueTouch Gen5 touchscreen
> controllers. This driver supports only the I2C bus but it uses regmap
> so SPI support could be added later.
> The touchscreen can retrieve some defined zone that are handled as
> buttons (according to the hardware). That is why it handles
> button and multitouch events.
> 
> Reviewed-by: Maxime Ripard <maxime.ripard@...tlin.com>
> Signed-off-by: Mylène Josserand <mylene.josserand@...tlin.com>
> Message-Id: <20180703094309.18514-2-mylene.josserand@...tlin.com>
> Signed-off-by: Alistair Francis <alistair@...stair23.me>

I finally got it working. The order of initialisation is important.
Params are copied on input_mt_init_slots() from ABS_MT* to ABS_*, so you
have to set params first.

Here is the patch i need on top of this one to make it actually work
with X (evdev and libinput is tested):

diff --git a/drivers/input/touchscreen/cyttsp5.c b/drivers/input/touchscreen/cyttsp5.c
index b5d96eb71e46..3894ec85a732 100644
--- a/drivers/input/touchscreen/cyttsp5.c
+++ b/drivers/input/touchscreen/cyttsp5.c
@@ -415,19 +415,12 @@ static int cyttsp5_setup_input_device(struct device *dev)
 	int max_x_tmp, max_y_tmp;
 	int error;
 
-	__set_bit(EV_REL, ts->input->evbit);
-
 	max_x_tmp = si->sensing_conf_data.res_x;
 	max_y_tmp = si->sensing_conf_data.res_y;
 	max_x = max_x_tmp - 1;
 	max_y = max_y_tmp - 1;
 	max_p = si->sensing_conf_data.max_z;
 
-	error = input_mt_init_slots(ts->input, si->tch_abs[CY_TCH_T].max,
-		INPUT_MT_DROP_UNUSED | INPUT_MT_POINTER);
-	if (error < 0)
-		return error;
-
 	input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, max_x, 0, 0);
 	input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, max_y, 0, 0);
 	input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, max_p, 0, 0);
@@ -435,6 +428,11 @@ static int cyttsp5_setup_input_device(struct device *dev)
 	input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
 	input_set_abs_params(ts->input, ABS_MT_TOUCH_MINOR, 0, MAX_AREA, 0, 0);
 
+	error = input_mt_init_slots(ts->input, si->tch_abs[CY_TCH_T].max,
+		INPUT_MT_DROP_UNUSED | INPUT_MT_DIRECT);
+	if (error < 0)
+		return error;
+
 	error = input_register_device(ts->input);
 	if (error < 0)
 		dev_err(dev, "Error, failed register input device r=%d\n", error);