linux-kernel - Re: gpio_keys and how PXA27x sets gpio_set_wake() (was Re: sharp c-3000 aka spitz: fix warn

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Date:	Tue, 26 Jan 2010 11:44:28 +0100
From:	Stanislav Brabec <utx@...guin.cz>
To:	Eric Miao <eric.y.miao@...il.com>
Cc:	Andrew Morton <akpm@...l.org>, thommycheck@...il.com,
	dbaryshkov@...il.com, dtor@...l.ru, arminlitzel@....de,
	linux-input@...r.kernel.org,
	kernel list <linux-kernel@...r.kernel.org>,
	Dirk@...er-online.de, "Rafael J. Wysocki" <rjw@...k.pl>,
	lenz@...wisc.edu, rpurdie@...ys.net,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Pavel Machek <pavel@....cz>, Cyril Hrubis <metan@....cz>,
	zaurus-devel@...ts.linuxtogo.org, omegamoon@...il.com,
	Vojtech Pavlik <vojtech@...e.cz>
Subject: Re: gpio_keys and how PXA27x sets gpio_set_wake() (was Re: sharp 
 c-3000 aka spitz: fix warn_on introduced in 2.6.32-rc1)

Eric Miao wrote:
> 2010/1/26 Stanislav Brabec <utx@...guin.cz>:

> > Handling platform specific edge/level wake setup would only complicate
> > the code. (In fact, even the PXA270 platform code does not exist yet -
> > arch/arm/mach-pxa/mfp-pxa2xx.c:__mfp_config_gpio() is not capable to
> > configure Power Manager Keyboard Wake-Up Enable Register (PKWR).)
> That's why WAKEUP_ON_EDGE_* is introduced, no need for gpio-keys
> to know this.

But WAKEUP_ON_EDGE_* is impossible for GPIO 95,
enable_irq_wake()/gpio_set_wake() returns EINVAL and disable_irq_wake()
complains on "Unbalanced IRQ 191".

In case of Zaurus, gpio_keys.c have to live with wakeup on level (PKWR)
when using enable/disable_irq_wake().

> > The problem affects gpio_keys: It is a driver implementing "one key per
> > gpio". It now handles On/Off and lid switches on Zaurus. Lid switches
> > are on "normal" GPIOs, On/Off switch is wired to PKWR capable GPIO.
> Ain't On/Off switch one of the matrix key? And so SPITZ_GPIO_KEY_INT
> could be used to handle that?

No. On/Off is connected directly to GPIO 95. Other keys use strobe/sense
matrix keypad.

SPITZ_GPIO_KEY_INT is a bit unspecific. I think it means: Charger was
inserted or key was pressed or On/Off was pressed.



________________________________________________________________________
Stanislav Brabec
http://www.penguin.cz/~utx/zaurus

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