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

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Date:	Wed, 22 Jul 2009 18:08:37 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	David Brownell <david-b@...bell.net>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Trilok Soni <soni.trilok@...il.com>,
	Pavel Machek <pavel@....cz>, Arve Hj?nnev?g <arve@...roid.com>,
	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, Peter Zijlstra <peterz@...radead.org>,
	Daniel Ribeiro <drwyrm@...il.com>
Subject: Re: Threaded interrupts for synaptic touchscreen in HTC dream

On Wed, Jul 22, 2009 at 10:04:10AM -0700, David Brownell wrote:
> On Wednesday 22 July 2009, Mark Brown wrote:

> > source for a PMIC then we've got generic code that expects to just take
> > a gpio/irq and interact with it.

> Is there a problem with how it works now?  GPIO calls come in
> sleeping (e.g. over I2C or SPI) and non-sleeping (classic SoC
> GPIOs) varieties.  And it's not gpiolib which would handle any

I don't think there's any problem at all with gpiolib at all, it's just
an example user here.

> IRQ support ... it's the driver for the GPIO chip, which would
> expose both irq_chip and gpio_chip facets.  (Just like classic
> SoC GPIO drivers.)

Ah, yeah.  If the chip IRQ driver handles the waking of the core thread 
then this'd not be a problem.  For some reason I was thinking of the
driver using gpiolib when I read Thomas' post.
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