Documentation/admin-guide/media/bt8xx.rst

Source file repositories/reference/linux-study-clean/Documentation/admin-guide/media/bt8xx.rst

File Facts

System
Linux kernel
Corpus path
Documentation/admin-guide/media/bt8xx.rst
Extension
.rst
Size
4908 bytes
Lines
158
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: documentation
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

.. SPDX-License-Identifier: GPL-2.0

==================================
How to get the bt8xx cards working
==================================

Authors:
	 Richard Walker,
	 Jamie Honan,
	 Michael Hunold,
	 Manu Abraham,
	 Uwe Bugla,
	 Michael Krufky

General information
-------------------

This class of cards has a bt878a as the PCI interface, and require the bttv
driver for accessing the i2c bus and the gpio pins of the bt8xx chipset.

Please see Documentation/admin-guide/media/bttv-cardlist.rst for a complete
list of Cards based on the Conexant Bt8xx PCI bridge supported by the
Linux Kernel.

In order to be able to compile the kernel, some config options should be
enabled::

    ./scripts/config -e PCI
    ./scripts/config -e INPUT
    ./scripts/config -m I2C
    ./scripts/config -m MEDIA_SUPPORT
    ./scripts/config -e MEDIA_PCI_SUPPORT
    ./scripts/config -e MEDIA_ANALOG_TV_SUPPORT
    ./scripts/config -e MEDIA_DIGITAL_TV_SUPPORT
    ./scripts/config -e MEDIA_RADIO_SUPPORT
    ./scripts/config -e RC_CORE
    ./scripts/config -m VIDEO_BT848
    ./scripts/config -m DVB_BT8XX

If you want to automatically support all possible variants of the Bt8xx
cards, you should also do::

    ./scripts/config -e MEDIA_SUBDRV_AUTOSELECT

.. note::

   Please use the following options with care as deselection of drivers which
   are in fact necessary may result in DVB devices that cannot be tuned due
   to lack of driver support.

If your goal is to just support an specific board, you may, instead,
disable MEDIA_SUBDRV_AUTOSELECT and manually select the frontend drivers
required by your board. With that, you can save some RAM.

You can do that by calling make xconfig/qconfig/menuconfig and look at
the options on those menu options (only enabled if
``Autoselect ancillary drivers`` is disabled:

#) ``Device drivers`` => ``Multimedia support`` => ``Customize TV tuners``
#) ``Device drivers`` => ``Multimedia support`` => ``Customize DVB frontends``

Then, on each of the above menu, please select your card-specific
frontend and tuner modules.


Loading Modules
---------------

Regular case: If the bttv driver detects a bt8xx-based DVB card, all
frontend and backend modules will be loaded automatically.

Annotation

Implementation Notes