linux-kernel - Re: [PATCH 1/4] input: touchscreen: ti_am335x_tsc Interchange touchscreen and ADC steps

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Message-ID: <20141106141916.GA17151@netboy>
Date:	Thu, 6 Nov 2014 15:19:17 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	Vignesh R <vigneshr@...com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Benoit Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	Jonathan Cameron <jic23@...nel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	devicetree@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Jan Kardell <jan.kardell@...liq.com>,
	linux-iio@...r.kernel.org,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Felipe Balbi <balbi@...com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Meerwald <pmeerw@...erw.net>,
	Hartmut Knaack <knaack.h@....de>, linux-omap@...r.kernel.org,
	Lee Jones <lee.jones@...aro.org>,
	linux-arm-kernel@...ts.infradead.org,
	Brad Griffis <bgriffis@...com>
Subject: Re: [PATCH 1/4] input: touchscreen: ti_am335x_tsc Interchange
 touchscreen and ADC steps

On Mon, Oct 27, 2014 at 04:38:28PM +0530, Vignesh R wrote:

...

> @@ -209,6 +214,7 @@ static void titsc_read_coordinates(struct titsc *ts_dev,
>  	unsigned int read, diff;
>  	unsigned int i, channel;
>  	unsigned int creads = ts_dev->coordinate_readouts;
> +	unsigned int first_step = TOTAL_STEPS - (creads * 2 + 2);
>  
>  	*z1 = *z2 = 0;
>  	if (fifocount % (creads * 2 + 2))
> @@ -226,7 +232,7 @@ static void titsc_read_coordinates(struct titsc *ts_dev,
>  
>  		channel = (read & 0xf0000) >> 16;
>  		read &= 0xfff;
> -		if (channel < creads) {
> +		if (channel > first_step + creads + 2) {
>  			diff = abs(read - prev_val_x);
>  			if (diff < prev_diff_x) {
>  				prev_diff_x = diff;
> @@ -234,19 +240,19 @@ static void titsc_read_coordinates(struct titsc *ts_dev,
>  			}
>  			prev_val_x = read;
>  
> -		} else if (channel < creads * 2) {
> +		} else if (channel == first_step + creads + 1) {
> +			*z1 = read;
> +
> +		} else if (channel == first_step + creads + 2) {
> +			*z2 = read;
> +
> +		} else if (channel > first_step) {
>  			diff = abs(read - prev_val_y);
>  			if (diff < prev_diff_y) {
>  				prev_diff_y = diff;
>  				*y = read;

While you are at it, please get rid of the this "delta filter"
nonsense.

Thanks,
Richard

>  			}
>  			prev_val_y = read;
> -
> -		} else if (channel < creads * 2 + 1) {
> -			*z1 = read;
> -
> -		} else if (channel < creads * 2 + 2) {
> -			*z2 = read;
>  		}
>  	}
>  }
> -- 
> 1.9.1
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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