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From: David Brownell <david-b@pacbell.net>
To: Arve =?iso-8859-1?q?Hj=F8nnev=E5g?= <arve@android.com>
Subject: Re: Threaded interrupts for synaptic touchscreen in HTC dream
Date: Wed, 22 Jul 2009 15:15:06 -0700
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Cc: Thomas Gleixner <tglx@linutronix.de>,
       Peter Zijlstra <peterz@infradead.org>,
       Mark Brown <broonie@opensource.wolfsonmicro.com>,
       Dmitry Torokhov <dmitry.torokhov@gmail.com>,
       Trilok Soni <soni.trilok@gmail.com>, Pavel Machek <pavel@ucw.cz>,
       kernel list <linux-kernel@vger.kernel.org>,
       Brian Swetland <swetland@google.com>, linux-input@vger.kernel.org,
       Andrew Morton <akpm@osdl.org>, linux-i2c@vger.kernel.org,
       Joonyoung Shim <jy0922.shim@samsung.com>, m.szyprowski@samsung.com,
       t.fujak@samsung.com, kyungmin.park@samsung.com,
       Daniel Ribeiro <drwyrm@gmail.com>
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On Wednesday 22 July 2009, Arve Hj?nnev?g 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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