If make is called twice like that:
	make V=1 DOCBOOKS=device-drivers.xml htmldocs

Make will fail with:

	make -f ./scripts/Makefile.build obj=scripts/basic
	rm -f .tmp_quiet_recordmcount
	make -f ./scripts/Makefile.build obj=scripts build_docproc
	make -f ./scripts/Makefile.build obj=Documentation/DocBook htmldocs
	rm -rf Documentation/DocBook/index.html; echo '<h1>Linux Kernel HTML Documentation</h1>' >> Documentation/DocBook/index.html && echo '<h2>Kernel Version: 4.2.0-rc2</h2>' >> Documentation/DocBook/index.html && cat Documentation/DocBook/device-drivers.html >> Documentation/DocBook/index.html
	cp ./Documentation/DocBook//bayer.png ./Documentation/DocBook//constraints.png ./Documentation/DocBook//crop.gif ./Documentation/DocBook//dvbstb.png ./Documentation/DocBook//fieldseq_bt.gif ./Documentation/DocBook//fieldseq_tb.gif ./Documentation/DocBook//nv12mt.gif ./Documentation/DocBook//nv12mt_example.gif ./Documentation/DocBook//pipeline.png ./Documentation/DocBook//selection.png ./Documentation/DocBook//vbi_525.gif ./Documentation/DocBook//vbi_625.gif ./Documentation/DocBook//vbi_hsync.gif ./Documentation/DocBook/media/*.svg ./Documentation/DocBook/media/v4l/*.svg ./Documentation/DocBook//media_api
	cp: target './Documentation/DocBook//media_api' is not a directory
	Documentation/DocBook/Makefile:53: recipe for target 'htmldocs' failed

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Acked-by: Jonathan Corbet <corbet@lwn.net>

Use a table for the Demux output. No new information added
here. They were all merged inside the table.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

The comments may affect enum value parsing. Use cpp to remove
them.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

In order to be sure that all enum definitions will be documented,
let's parse the enum values and add xref links to them.

Lots of missing references will be risen as we miss adding
id's to those symbols at the documentation. Next patches will
fix this.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

The DVB network API was not documented. There are just some
placeholders there.

Replace it by a proper documentation.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

The typedef parser is wrong and doesn't get some of the
types defined at the DVB API. Improve it, as we want to add
cross-references to those types.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

The new code that detects undocumented ioctls hits some false
positives:

This one is not documented, nor it should, as this is
there just to reserve namespace:

	Warning: can't find reference for VIDIOC_RESERVED ioctl

But those are already documented together with other ioctls:

	Warning: can't find reference for VIDIOC_UNSUBSCRIBE_EVENT ioctl
	Warning: can't find reference for FE_GET_PROPERTY ioctl
	Warning: can't find reference for VIDIOC_SUBDEV_G_EDID ioctl
	Warning: can't find reference for VIDIOC_SUBDEV_S_EDID ioctl
	Warning: can't find reference for VIDIOC_SUBDEV_S_DV_TIMINGS ioctl
	Warning: can't find reference for VIDIOC_SUBDEV_G_DV_TIMINGS ioctl
	Warning: can't find reference for VIDIOC_SUBDEV_QUERY_DV_TIMINGS ioctl

So, we need to just be sure to point to the right documentation.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

Those ioctls are already parsed. No need to explicitly add
them.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

There are several badly documented undocumented ioctls.
Currently, it just generates an empty link. Instead of doing that,
only add references to the ones that exists, and add a warning
for all references that weren't found.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

Create xref links for all DTV properties and link the frontend.h
to each. Also use them at the DVB frontent API example.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>