linux-kernel - Re: [PATCH v2 2/4] da850-evm: add UI Expander pushbuttons

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Date:	Mon, 22 Nov 2010 08:50:48 -0500
From:	Ben Gardiner <bengardiner@...ometrics.ca>
To:	"Nori, Sekhar" <nsekhar@...com>
Cc:	Kevin Hilman <khilman@...prootsystems.com>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"Govindarajan, Sriramakrishnan" <srk@...com>,
	Paul Mundt <lethal@...ux-sh.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Alexander Clouter <alex@...riz.org.uk>,
	Chris Cordahi <christophercordahi@...ometrics.ca>
Subject: Re: [PATCH v2 2/4] da850-evm: add UI Expander pushbuttons

On Mon, Nov 22, 2010 at 6:49 AM, Nori, Sekhar <nsekhar@...com> wrote:
> On Fri, Nov 19, 2010 at 21:08:10, Ben Gardiner wrote:
>> [...]
>> By setting INPUT_POLLDEV default for the da850-evm users will get
>> functioning pushbuttons and switches with the default config but they
>> will be able to disable INPUT_POLLDEV or gpio-keys drivers in their
>> defconfig at their convenience.
>
> I guess we could also just modify the defconfig to switch on
> INPUT_POLLDEV? Since only gpio-keys functionality is affected
> by not enabling the correct options in kernel, it should be OK.

Yes -- only gpio-keys is affected but enabling the option does
introduce an additional .o file:

drivers/input/Makefile:obj-$(CONFIG_INPUT_POLLDEV)      += input-polldev.o

I agree that in its current state a user couls inadvertently disable
the gpio-keys support on da850-evm simply by disabling INPUT_POLLDEV
-- which is less than Ideal. How about I replace the current changes
to arch/arm/mach-davinci/Kconfig with:

config KEYBOARD_GPIO
        default MACH_DAVINCI_DA850_EVM
        select INPUT_POLLDEV

So 1) gpio-keys functionality is default for the da850evm and 2)
whenever gpio-keys is enabled so is INPUT_POLLDEV.

Best Regards,
Ben Gardiner

---
Nanometrics Inc.
http://www.nanometrics.ca
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