linux-kernel - Re: [PATCH v2 4/8] Input: pixcir_i2c_ts: Use Type-B Multi-Touch protocol

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Date:	Sat, 08 Mar 2014 16:11:45 +0100
From:	Henrik Rydberg <rydberg@...omail.se>
To:	Roger Quadros <rogerq@...com>, dmitry.torokhov@...il.com
CC:	jcbian@...cir.com.cn, balbi@...com, dmurphy@...com,
	mugunthanvnm@...com, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 4/8] Input: pixcir_i2c_ts: Use Type-B Multi-Touch protocol

Hi Roger,

the MT implementation seems mostly fine, just one curiosity:

>  static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
>  {
>  	struct pixcir_i2c_ts_data *tsdata = dev_id;
>  	const struct pixcir_ts_platform_data *pdata = tsdata->chip;
> +	struct pixcir_report_data report;
>  
>  	while (!tsdata->exiting) {
> -		pixcir_ts_poscheck(tsdata);
> -
> -		if (gpio_get_value(pdata->gpio_attb))
> +		/* parse packet */
> +		pixcir_ts_parse(tsdata, &report);
> +
> +		/* report it */
> +		pixcir_ts_report(tsdata, &report);
> +
> +		if (gpio_get_value(pdata->gpio_attb)) {
> +			if (report.num_touches) {
> +				/*
> +				 * Last report with no finger up?
> +				 * Do it now then.
> +				 */
> +				input_mt_sync_frame(tsdata->input);
> +				input_sync(tsdata->input);

Why is this special handling needed?

Thanks,
Henrik

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