linux-kernel - Re: Threaded interrupts for synaptic touchscreen in HTC dream

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Message-Id: <200907221515.07835.david-b@pacbell.net>
Date:	Wed, 22 Jul 2009 15:15:06 -0700
From:	David Brownell <david-b@...bell.net>
To:	Arve Hjønnevåg <arve@...roid.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Trilok Soni <soni.trilok@...il.com>,
	Pavel Machek <pavel@....cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	Brian Swetland <swetland@...gle.com>,
	linux-input@...r.kernel.org, Andrew Morton <akpm@...l.org>,
	linux-i2c@...r.kernel.org,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	m.szyprowski@...sung.com, t.fujak@...sung.com,
	kyungmin.park@...sung.com, Daniel Ribeiro <drwyrm@...il.com>
Subject: Re: Threaded interrupts for synaptic touchscreen in HTC dream

On Wednesday 22 July 2009, Arve Hjønnevåg wrote:
> It would also be useful to mask an edge triggered interrupt until the
> thread handler has finished. The touchscreen on the G1 is connected to
> an edge triggered interrupt, and the touchscreen may toggle the
> interrupt line while reading its registers.

To clarify:  if it does toggle, do you want that event to be
queued up so the IRQ is re-issued -- or not?  That "oneshot"
mechanism does some of that, though it's for level triggers.

Parts of that might be appropriate to handle in the threaded
IRQ handler itself.  It seems a bit device-specific.

- Dave

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