Improve DVB documentation and reduce its gap

The DVB documentation was negligected for a long time, with resulted on several gaps between the API description and its documentation.

I'm doing a new reading at the documentation. As result of it, this series:

- improves the introductory chapter, making it more generic;
- Do some adjustments at the frontend API, using kernel-doc when possible.
- Remove unused APIs at DVB demux. I suspect that the drivers implementing such APIs were either never merged upstream, or the API itself were never used or was deprecated a long time ago. In any case, it doesn't make any sense to carry on APIs that aren't properly documented, nor are used on the upstream Kernel.

With this patch series, the gap between documentation and code is solved for 3 DVB APIs:

- Frontend API;
- Demux API;
- Net API.

There is still a gap at the CA API, as there are three ioctls that are used only by a few drivers and whose structs are not properly documented:
CA_GET_MSG, CA_SEND_MSG and CA_SET_DESCR.

The first two ones seem to be related to a way that a few drivers provide to send/receive messages. Yet, I was unable to get what "index" and "type" means on those ioctls. The CA_SET_DESCR is only supported by av7110 driver, and has an even weirder undocumented struct. I was unable to discover at the Kernel, VDR or Kaffeine how those structs are filled. I suspect that there's something wrong there, but I won't risk trying to fix without knowing more about them. So, let's just document that those are needing documentation :-)

---

v2: Added CA API patches at the end and verified that everything compiles after each patch. Also do some fixes at dst_ca for it to report the error code to userspace and remove boilerplate code there.

Mauro Carvalho Chehab (27):
media: ca.h: split typedefs from structs
media: dmx.h: split typedefs from structs
media: dvb/intro: use the term Digital TV to refer to the system
media: dvb/intro: update references for TV standards
media: dvb/intro: update the history part of the document
media: dvb/intro: adjust the notices about optional hardware
media: dvb/frontend.h: move out a private internal structure
media: dvb/frontend.h: document the uAPI file
media: dvb frontend docs: use kernel-doc documentation
media: fe_property_parameters.rst: better define properties usage
media: fe_property_parameters.rst: better document bandwidth
media: dmx.h: get rid of unused DMX_KERNEL_CLIENT
media: dmx.h: get rid of DMX_GET_CAPS
media: dmx.h: get rid of DMX_SET_SOURCE
media: dmx.h: get rid of GET_DMX_EVENT
media: dmx.h: add kernel-doc markups and use it at Documentation/
media: net.rst: Fix the level of a section of the net chapter
media: ca.h: get rid of CA_SET_PID
media: ca.h: document most CA data types
media: dst_ca: return a proper error code from CA errors
media: ca-reset.rst: add some description to this ioctl
media: ca-get-cap.rst: document this ioctl
media: ca-get-slot-info.rst: document this ioctl
media: ca-get-descr-info.rst: document this ioctl
media: dvb CA docs: place undocumented data together with ioctls
media: dvb rst: identify the documentation gap at the API
media: dst_ca: remove CA_SET_DESCR boilerplate

 Documentation/media/ca.h.rst.exceptions            |    1 -
 Documentation/media/dmx.h.rst.exceptions           |   20 +-
 Documentation/media/dvb-drivers/ci.rst             |    1 -
 Documentation/media/frontend.h.rst.exceptions      |  185 ++-
 Documentation/media/uapi/dvb/ca-get-cap.rst        |   36 +-
 Documentation/media/uapi/dvb/ca-get-descr-info.rst |   29 +-
 Documentation/media/uapi/dvb/ca-get-msg.rst        |   38 +-
 Documentation/media/uapi/dvb/ca-get-slot-info.rst  |   98 +-
 Documentation/media/uapi/dvb/ca-reset.rst          |    3 +-
 Documentation/media/uapi/dvb/ca-set-descr.rst      |   10 +
 Documentation/media/uapi/dvb/ca-set-pid.rst        |   60 -
 Documentation/media/uapi/dvb/ca.rst                |    5 +
 Documentation/media/uapi/dvb/ca_data_types.rst     |  103 +-
 Documentation/media/uapi/dvb/ca_function_calls.rst |    1 -
 Documentation/media/uapi/dvb/dmx-get-caps.rst      |   41 -
 Documentation/media/uapi/dvb/dmx-get-event.rst     |   60 -
 Documentation/media/uapi/dvb/dmx-set-source.rst    |   44 -
 Documentation/media/uapi/dvb/dmx_fcalls.rst        |    3 -
 Documentation/media/uapi/dvb/dmx_types.rst         |  225 +---
 Documentation/media/uapi/dvb/dtv-fe-stats.rst      |   17 -
 Documentation/media/uapi/dvb/dtv-properties.rst    |   15 -
 Documentation/media/uapi/dvb/dtv-property.rst      |   31 -
 Documentation/media/uapi/dvb/dtv-stats.rst         |   18 -
 Documentation/media/uapi/dvb/dvbproperty-006.rst   |   12 -
 Documentation/media/uapi/dvb/dvbproperty.rst       |   28 +-
 .../media/uapi/dvb/fe-diseqc-recv-slave-reply.rst  |   40 +-
 .../media/uapi/dvb/fe-diseqc-send-burst.rst        |   31 +-
 .../media/uapi/dvb/fe-diseqc-send-master-cmd.rst   |   29 +-
 Documentation/media/uapi/dvb/fe-get-info.rst       |  370 +-----
 Documentation/media/uapi/dvb/fe-get-property.rst   |    2 +-
 Documentation/media/uapi/dvb/fe-read-status.rst    |   83 --
 Documentation/media/uapi/dvb/fe-set-tone.rst       |   30 -
 .../media/uapi/dvb/fe_property_parameters.rst      | 1383 +++-----------------
 Documentation/media/uapi/dvb/frontend-header.rst   |    4 +
 Documentation/media/uapi/dvb/intro.rst             |   76 +-
 Documentation/media/uapi/dvb/legacy_dvb_apis.rst   |    5 +
 Documentation/media/uapi/dvb/net.rst               |    1 -
 drivers/media/dvb-core/dmxdev.c                    |    4 +-
 drivers/media/dvb-core/dvb_frontend.c              |   11 +
 drivers/media/pci/bt8xx/dst_ca.c                   |   70 +-
 drivers/media/pci/ttpci/av7110.h                   |    2 +-
 drivers/media/pci/ttpci/av7110_ca.c                |   12 +-
 include/uapi/linux/dvb/ca.h                        |  128 +-
 include/uapi/linux/dvb/dmx.h                       |  191 ++-
 include/uapi/linux/dvb/frontend.h                  |  591 +++++++--
 45 files changed, 1267 insertions(+), 2880 deletions(-)
 delete mode 100644 Documentation/media/uapi/dvb/ca-set-pid.rst
 delete mode 100644 Documentation/media/uapi/dvb/dmx-get-caps.rst
 delete mode 100644 Documentation/media/uapi/dvb/dmx-get-event.rst
 delete mode 100644 Documentation/media/uapi/dvb/dmx-set-source.rst
 delete mode 100644 Documentation/media/uapi/dvb/dtv-fe-stats.rst
 delete mode 100644 Documentation/media/uapi/dvb/dtv-properties.rst
 delete mode 100644 Documentation/media/uapi/dvb/dtv-property.rst
 delete mode 100644 Documentation/media/uapi/dvb/dtv-stats.rst
 delete mode 100644 Documentation/media/uapi/dvb/dvbproperty-006.rst
 create mode 100644 Documentation/media/uapi/dvb/frontend-header.rst

2.13.5