OMAP4&drivers/misc: introduce face detection module driver

Hi,

These patches(against -next tree) introduce a device driver under
drivers/misc for enabling one face detection IP[1] which is
integrated inside OMAP4 SoC currently, and have some OMAP4
platform dependent changes to make the module workable on OMAP4 SoC.

For verification purpose, I write one user space utility[2] to
test the module and driver, follows its basic functions:

	- detect faces in a input grayscal picture(PGM raw, 320 by 240)
	- plot a rectangle to mark the detected faces, and save it as
	another same type grayscal picture
	- set detection parameters

I should have though about implementing a face detection demo on video
playback from uvc camera, but OMAP4 DSS on -next tree can't work,
so have to quit the idea.

Looks the performance of the module is not bad, see some detection
results on the link[3][4]. 

Face detection can be used to implement some interesting applications
(camera, face unlock, baby monitor, ...).

 arch/arm/mach-omap2/devices.c              |   33 +
 arch/arm/mach-omap2/omap_hwmod_44xx_data.c |   81 +++
 drivers/misc/Kconfig                       |    7 +
 drivers/misc/Makefile                      |    1 +
 drivers/misc/fdif.c                        |  874 ++++++++++++++++++++++++++++
 include/linux/fdif.h                       |   67 +++
 include/linux/major.h                      |    1 +
 7 files changed, 1064 insertions(+), 0 deletions(-)


thanks,
--
Ming Lei


[1], Ch9 of OMAP4 Technical Reference Manual
[2], http://kernel.ubuntu.com/git?p=ming/fdif.git;a=summary
[3], http://kernel.ubuntu.com/~ming/dev/fdif/output
[4], All pictures are taken from http://www.google.com/imghp
and converted to pnm from jpeg format, only for test purpose.

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