linux-kernel - Re: [PATCH 1/2] platform: x86: dell-smo8800: Dell Latitude freefall driver (ACPI SMO8800/SMO8810)

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Date:	Tue, 20 May 2014 03:00:05 -0400
From:	Valdis.Kletnieks@...edu
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Matthew Garrett <matthew.garrett@...ula.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
	linux-doc@...r.kernel.org, Sonal Santan <sonal.santan@...il.com>
Subject: Re: [PATCH 1/2] platform: x86: dell-smo8800: Dell Latitude freefall driver (ACPI SMO8800/SMO8810)

On Sat, 03 May 2014 12:47:56 +0200, Pali Rohár said:
> This acpi driver provide supports for freefall sensors SMO8800/SMO8810 which
> can be found on Dell Latitude laptops. Driver register /dev/freefall misc
> device which has same interface as driver hp_accel freefall driver. So any
> existing applications for HP freefall sensor /dev/freefall will work for with
> this new driver for Dell Latitude laptops too.

So just for grins, I tossed this patchset on top of next-20140519, and
it actually works on my Dell Latitude E6530. Tested with a controlled
drop of 3-4 inches, and I get the distinctive sound of a head park, and
the following in /var/log/messages:

May 20 02:46:22 turing-police kernel: [18839.158926] smo8800 SMO8810:00: detected free fall
May 20 02:46:22 turing-police FREE FALL[1337]: Parked /dev/sda disk head
May 20 02:46:24 turing-police FREE FALL[1337]: Unparked /dev/sda disk head

I did a quick read-through of the code, looks OK.  checkpatch complains about
missing blank lines after declarations in 3-4 places. Sparse and gcc have no
complaints. We've certainly merged much uglier code.  And it certainly makes
the world a better place for us Dell users.

So it's OK by me if Pali adds this to the signoffs after fixing the
checkpatch and the one serious nit below....

Tested-By: Valdis Kletnieks <valdis.kletnieks@...edu>
Acked-By: Valdis Kletnieks <valdis.kletnieks@...edu>

One nit:

> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -127,6 +127,16 @@ config DELL_WMI_AIO
>  	  To compile this driver as a module, choose M here: the module will
>  	  be called dell-wmi-aio.
>  
> +config DELL_SMO8800
> +	tristate "Dell Latitude freefall driver (ACPI SMO8800/SMO8810)"
> +	depends ON ACPI

Lowercase ON.  Not sure how this escaped, Kbuild barfs on it.

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