From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 3/6] Add chip driver for WM9712 touchscreen
Date: Wed, 27 Feb 2008 23:09:37 -0800
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To: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Dmitry Torokhov <dtor@mail.ru>, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Liam Girdwood <liam.girdwood@wolfsonmicro.com>, Graeme Gregory <gg@opensource.wolfsonmicro.com>, Mike Arthur <mike.arthur@wolfsonmicro.com>, Dmitry Baryshkov <dbaryshkov@gmail.com>, Stanley Cai <stanley.cai@intel.com>, Rodolfo Giometti <giometti@enneenne.com>, Russell King <rmk@arm.linux.org.uk>, Marc Kleine-Budde <mkl@pengutronix.de>, Pete MacKay <linux01@architechnical.net>, Ian Molton <spyro@f2s.com>, Vince Sanders <vince@kyllikki.org>, Andrew Zabolotny <zap@homelink.ru>

On Tue, 26 Feb 2008 13:40:15 +0000 Mark Brown <broonie@opensource.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.