linux-kernel - Re: [PATCH 3/6] Add chip driver for WM9712 touchscreen

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Date:	Wed, 27 Feb 2008 23:09:37 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Dmitry Torokhov <dtor@...l.ru>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Liam Girdwood <liam.girdwood@...fsonmicro.com>,
	Graeme Gregory <gg@...nsource.wolfsonmicro.com>,
	Mike Arthur <mike.arthur@...fsonmicro.com>,
	Dmitry Baryshkov <dbaryshkov@...il.com>,
	Stanley Cai <stanley.cai@...el.com>,
	Rodolfo Giometti <giometti@...eenne.com>,
	Russell King <rmk@....linux.org.uk>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Pete MacKay <linux01@...hitechnical.net>,
	Ian Molton <spyro@....com>, Vince Sanders <vince@...likki.org>,
	Andrew Zabolotny <zap@...elink.ru>
Subject: Re: [PATCH 3/6] Add chip driver for WM9712 touchscreen

On Tue, 26 Feb 2008 13:40:15 +0000 Mark Brown <broonie@...nsource.wolfsonmicro.com> wrote:

> +/*
> + * Set adc sample delay.
> + *
> + * For accurate touchpanel measurements, some settling time may be
> + * required between the switch matrix applying a voltage across the
> + * touchpanel plate and the ADC sampling the signal.
> + *
> + * This delay can be set by setting delay = n, where n is the array
> + * position of the delay in the array delay_table below.
> + * Long delays > 1ms are supported for completeness, but are not
> + * recommended.
> + */
> +static int delay = 3;
> +module_param(delay, int, 0);
> +MODULE_PARM_DESC(delay, "Set adc sample delay.");

I assume we don't support more than one attached device per host?

If so, is that a problem?  One could envisage an application with lots
of screens attached to one Linux box.
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