Re: [PATCH v7 4/4] Input: st1232 - add touch overlays handling

[Jeff LaBundy]

Hi Javier,

On Fri, Jan 19, 2024 at 08:43:36AM +0100, Javier Carrasco wrote:
> Use touch-overlay to support overlay objects such as buttons and a resized
> frame defined in the device tree.
> 
> If buttons are provided, register an additional device to report key
> events separately. A key event will be generated if the coordinates
> of a touch event are within the area defined by the button properties.
> 
> Signed-off-by: Javier Carrasco <javier.carrasco@xxxxxxxxxxxxxx>

Reviewed-by: Jeff LaBundy <jeff@xxxxxxxxxxx>

> ---
>  drivers/input/touchscreen/st1232.c | 48 +++++++++++++++++++++++++++-----------
>  1 file changed, 34 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/st1232.c b/drivers/input/touchscreen/st1232.c
> index 6475084aee1b..4fa31447dbc1 100644
> --- a/drivers/input/touchscreen/st1232.c
> +++ b/drivers/input/touchscreen/st1232.c
> @@ -22,6 +22,7 @@
>  #include <linux/pm_qos.h>
>  #include <linux/slab.h>
>  #include <linux/types.h>
> +#include <linux/input/touch-overlay.h>
>  
>  #define ST1232_TS_NAME	"st1232-ts"
>  #define ST1633_TS_NAME	"st1633-ts"
> @@ -57,6 +58,7 @@ struct st1232_ts_data {
>  	struct dev_pm_qos_request low_latency_req;
>  	struct gpio_desc *reset_gpio;
>  	const struct st_chip_info *chip_info;
> +	struct list_head touch_overlay_list;
>  	int read_buf_len;
>  	u8 *read_buf;
>  };
> @@ -138,14 +140,20 @@ static int st1232_ts_parse_and_report(struct st1232_ts_data *ts)
>  
>  	for (i = 0; i < ts->chip_info->max_fingers; i++) {
>  		u8 *buf = &ts->read_buf[i * 4];
> +		bool contact = buf[0] & BIT(7);
> +		unsigned int x, y;
>  
> -		if (buf[0] & BIT(7)) {
> -			unsigned int x = ((buf[0] & 0x70) << 4) | buf[1];
> -			unsigned int y = ((buf[0] & 0x07) << 8) | buf[2];
> -
> -			touchscreen_set_mt_pos(&pos[n_contacts],
> -					       &ts->prop, x, y);
> +		if (contact) {
> +			x = ((buf[0] & 0x70) << 4) | buf[1];
> +			y = ((buf[0] & 0x07) << 8) | buf[2];
> +		}
> +		if (touch_overlay_process_event(&ts->touch_overlay_list, input,
> +						contact ? &x : NULL,
> +						contact ? &y : NULL, i))
> +			continue;
>  
> +		if (contact) {
> +			touchscreen_set_mt_pos(&pos[n_contacts], &ts->prop, x, y);
>  			/* st1232 includes a z-axis / touch strength */
>  			if (ts->chip_info->have_z)
>  				z[n_contacts] = ts->read_buf[i + 6];
> @@ -292,18 +300,30 @@ static int st1232_ts_probe(struct i2c_client *client)
>  	if (error)
>  		return error;
>  
> -	/* Read resolution from the chip */
> -	error = st1232_ts_read_resolution(ts, &max_x, &max_y);
> -	if (error) {
> -		dev_err(&client->dev,
> -			"Failed to read resolution: %d\n", error);
> -		return error;
> -	}
> -
>  	if (ts->chip_info->have_z)
>  		input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
>  				     ts->chip_info->max_area, 0, 0);
>  
> +	/* map overlay objects if defined in the device tree */
> +	INIT_LIST_HEAD(&ts->touch_overlay_list);
> +	error = touch_overlay_map(&ts->touch_overlay_list, input_dev);
> +	if (error)
> +		return error;
> +
> +	if (touch_overlay_mapped_touchscreen(&ts->touch_overlay_list)) {
> +		/* Read resolution from the overlay touchscreen if defined */
> +		touch_overlay_get_touchscreen_abs(&ts->touch_overlay_list,
> +						  &max_x, &max_y);
> +	} else {
> +		/* Read resolution from the chip */
> +		error = st1232_ts_read_resolution(ts, &max_x, &max_y);
> +		if (error) {
> +			dev_err(&client->dev,
> +				"Failed to read resolution: %d\n", error);
> +			return error;
> +		}
> +	}
> +
>  	input_set_abs_params(input_dev, ABS_MT_POSITION_X,
>  			     0, max_x, 0, 0);
>  	input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
> 
> -- 
> 2.39.2
> 

Kind regards,
Jeff LaBundy