786baecfe7
As media/dvb will be removed, move it to a proper place. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
233 lines
9.7 KiB
Plaintext
233 lines
9.7 KiB
Plaintext
Documentation for dvb-usb-framework module and its devices
|
|
|
|
Idea behind the dvb-usb-framework
|
|
=================================
|
|
|
|
In March 2005 I got the new Twinhan USB2.0 DVB-T device. They provided specs and a firmware.
|
|
|
|
Quite keen I wanted to put the driver (with some quirks of course) into dibusb.
|
|
After reading some specs and doing some USB snooping, it realized, that the
|
|
dibusb-driver would be a complete mess afterwards. So I decided to do it in a
|
|
different way: With the help of a dvb-usb-framework.
|
|
|
|
The framework provides generic functions (mostly kernel API calls), such as:
|
|
|
|
- Transport Stream URB handling in conjunction with dvb-demux-feed-control
|
|
(bulk and isoc are supported)
|
|
- registering the device for the DVB-API
|
|
- registering an I2C-adapter if applicable
|
|
- remote-control/input-device handling
|
|
- firmware requesting and loading (currently just for the Cypress USB
|
|
controllers)
|
|
- other functions/methods which can be shared by several drivers (such as
|
|
functions for bulk-control-commands)
|
|
- TODO: a I2C-chunker. It creates device-specific chunks of register-accesses
|
|
depending on length of a register and the number of values that can be
|
|
multi-written and multi-read.
|
|
|
|
The source code of the particular DVB USB devices does just the communication
|
|
with the device via the bus. The connection between the DVB-API-functionality
|
|
is done via callbacks, assigned in a static device-description (struct
|
|
dvb_usb_device) each device-driver has to have.
|
|
|
|
For an example have a look in drivers/media/usb/dvb-usb/vp7045*.
|
|
|
|
Objective is to migrate all the usb-devices (dibusb, cinergyT2, maybe the
|
|
ttusb; flexcop-usb already benefits from the generic flexcop-device) to use
|
|
the dvb-usb-lib.
|
|
|
|
TODO: dynamic enabling and disabling of the pid-filter in regard to number of
|
|
feeds requested.
|
|
|
|
Supported devices
|
|
========================
|
|
|
|
See the LinuxTV DVB Wiki at www.linuxtv.org for a complete list of
|
|
cards/drivers/firmwares:
|
|
|
|
http://www.linuxtv.org/wiki/index.php/DVB_USB
|
|
|
|
0. History & News:
|
|
2005-06-30 - added support for WideView WT-220U (Thanks to Steve Chang)
|
|
2005-05-30 - added basic isochronous support to the dvb-usb-framework
|
|
added support for Conexant Hybrid reference design and Nebula DigiTV USB
|
|
2005-04-17 - all dibusb devices ported to make use of the dvb-usb-framework
|
|
2005-04-02 - re-enabled and improved remote control code.
|
|
2005-03-31 - ported the Yakumo/Hama/Typhoon DVB-T USB2.0 device to dvb-usb.
|
|
2005-03-30 - first commit of the dvb-usb-module based on the dibusb-source. First device is a new driver for the
|
|
TwinhanDTV Alpha / MagicBox II USB2.0-only DVB-T device.
|
|
|
|
(change from dvb-dibusb to dvb-usb)
|
|
2005-03-28 - added support for the AVerMedia AverTV DVB-T USB2.0 device (Thanks to Glen Harris and Jiun-Kuei Jung, AVerMedia)
|
|
2005-03-14 - added support for the Typhoon/Yakumo/HAMA DVB-T mobile USB2.0
|
|
2005-02-11 - added support for the KWorld/ADSTech Instant DVB-T USB2.0. Thanks a lot to Joachim von Caron
|
|
2005-02-02 - added support for the Hauppauge Win-TV Nova-T USB2
|
|
2005-01-31 - distorted streaming is gone for USB1.1 devices
|
|
2005-01-13 - moved the mirrored pid_filter_table back to dvb-dibusb
|
|
- first almost working version for HanfTek UMT-010
|
|
- found out, that Yakumo/HAMA/Typhoon are predecessors of the HanfTek UMT-010
|
|
2005-01-10 - refactoring completed, now everything is very delightful
|
|
- tuner quirks for some weird devices (Artec T1 AN2235 device has sometimes a
|
|
Panasonic Tuner assembled). Tunerprobing implemented. Thanks a lot to Gunnar Wittich.
|
|
2004-12-29 - after several days of struggling around bug of no returning URBs fixed.
|
|
2004-12-26 - refactored the dibusb-driver, splitted into separate files
|
|
- i2c-probing enabled
|
|
2004-12-06 - possibility for demod i2c-address probing
|
|
- new usb IDs (Compro, Artec)
|
|
2004-11-23 - merged changes from DiB3000MC_ver2.1
|
|
- revised the debugging
|
|
- possibility to deliver the complete TS for USB2.0
|
|
2004-11-21 - first working version of the dib3000mc/p frontend driver.
|
|
2004-11-12 - added additional remote control keys. Thanks to Uwe Hanke.
|
|
2004-11-07 - added remote control support. Thanks to David Matthews.
|
|
2004-11-05 - added support for a new devices (Grandtec/Avermedia/Artec)
|
|
- merged my changes (for dib3000mb/dibusb) to the FE_REFACTORING, because it became HEAD
|
|
- moved transfer control (pid filter, fifo control) from usb driver to frontend, it seems
|
|
better settled there (added xfer_ops-struct)
|
|
- created a common files for frontends (mc/p/mb)
|
|
2004-09-28 - added support for a new device (Unknown, vendor ID is Hyper-Paltek)
|
|
2004-09-20 - added support for a new device (Compro DVB-U2000), thanks
|
|
to Amaury Demol for reporting
|
|
- changed usb TS transfer method (several urbs, stopping transfer
|
|
before setting a new pid)
|
|
2004-09-13 - added support for a new device (Artec T1 USB TVBOX), thanks
|
|
to Christian Motschke for reporting
|
|
2004-09-05 - released the dibusb device and dib3000mb-frontend driver
|
|
|
|
(old news for vp7041.c)
|
|
2004-07-15 - found out, by accident, that the device has a TUA6010XS for
|
|
PLL
|
|
2004-07-12 - figured out, that the driver should also work with the
|
|
CTS Portable (Chinese Television System)
|
|
2004-07-08 - firmware-extraction-2.422-problem solved, driver is now working
|
|
properly with firmware extracted from 2.422
|
|
- #if for 2.6.4 (dvb), compile issue
|
|
- changed firmware handling, see vp7041.txt sec 1.1
|
|
2004-07-02 - some tuner modifications, v0.1, cleanups, first public
|
|
2004-06-28 - now using the dvb_dmx_swfilter_packets, everything
|
|
runs fine now
|
|
2004-06-27 - able to watch and switching channels (pre-alpha)
|
|
- no section filtering yet
|
|
2004-06-06 - first TS received, but kernel oops :/
|
|
2004-05-14 - firmware loader is working
|
|
2004-05-11 - start writing the driver
|
|
|
|
1. How to use?
|
|
1.1. Firmware
|
|
|
|
Most of the USB drivers need to download a firmware to the device before start
|
|
working.
|
|
|
|
Have a look at the Wikipage for the DVB-USB-drivers to find out, which firmware
|
|
you need for your device:
|
|
|
|
http://www.linuxtv.org/wiki/index.php/DVB_USB
|
|
|
|
1.2. Compiling
|
|
|
|
Since the driver is in the linux kernel, activating the driver in
|
|
your favorite config-environment should sufficient. I recommend
|
|
to compile the driver as module. Hotplug does the rest.
|
|
|
|
If you use dvb-kernel enter the build-2.6 directory run 'make' and 'insmod.sh
|
|
load' afterwards.
|
|
|
|
1.3. Loading the drivers
|
|
|
|
Hotplug is able to load the driver, when it is needed (because you plugged
|
|
in the device).
|
|
|
|
If you want to enable debug output, you have to load the driver manually and
|
|
from within the dvb-kernel cvs repository.
|
|
|
|
first have a look, which debug level are available:
|
|
|
|
modinfo dvb-usb
|
|
modinfo dvb-usb-vp7045
|
|
etc.
|
|
|
|
modprobe dvb-usb debug=<level>
|
|
modprobe dvb-usb-vp7045 debug=<level>
|
|
etc.
|
|
|
|
should do the trick.
|
|
|
|
When the driver is loaded successfully, the firmware file was in
|
|
the right place and the device is connected, the "Power"-LED should be
|
|
turned on.
|
|
|
|
At this point you should be able to start a dvb-capable application. I'm use
|
|
(t|s)zap, mplayer and dvbscan to test the basics. VDR-xine provides the
|
|
long-term test scenario.
|
|
|
|
2. Known problems and bugs
|
|
|
|
- Don't remove the USB device while running an DVB application, your system
|
|
will go crazy or die most likely.
|
|
|
|
2.1. Adding support for devices
|
|
|
|
TODO
|
|
|
|
2.2. USB1.1 Bandwidth limitation
|
|
|
|
A lot of the currently supported devices are USB1.1 and thus they have a
|
|
maximum bandwidth of about 5-6 MBit/s when connected to a USB2.0 hub.
|
|
This is not enough for receiving the complete transport stream of a
|
|
DVB-T channel (which is about 16 MBit/s). Normally this is not a
|
|
problem, if you only want to watch TV (this does not apply for HDTV),
|
|
but watching a channel while recording another channel on the same
|
|
frequency simply does not work very well. This applies to all USB1.1
|
|
DVB-T devices, not just the dvb-usb-devices)
|
|
|
|
The bug, where the TS is distorted by a heavy usage of the device is gone
|
|
definitely. All dvb-usb-devices I was using (Twinhan, Kworld, DiBcom) are
|
|
working like charm now with VDR. Sometimes I even was able to record a channel
|
|
and watch another one.
|
|
|
|
2.3. Comments
|
|
|
|
Patches, comments and suggestions are very very welcome.
|
|
|
|
3. Acknowledgements
|
|
Amaury Demol (ademol@dibcom.fr) and Francois Kanounnikoff from DiBcom for
|
|
providing specs, code and help, on which the dvb-dibusb, dib3000mb and
|
|
dib3000mc are based.
|
|
|
|
David Matthews for identifying a new device type (Artec T1 with AN2235)
|
|
and for extending dibusb with remote control event handling. Thank you.
|
|
|
|
Alex Woods for frequently answering question about usb and dvb
|
|
stuff, a big thank you.
|
|
|
|
Bernd Wagner for helping with huge bug reports and discussions.
|
|
|
|
Gunnar Wittich and Joachim von Caron for their trust for providing
|
|
root-shells on their machines to implement support for new devices.
|
|
|
|
Allan Third and Michael Hutchinson for their help to write the Nebula
|
|
digitv-driver.
|
|
|
|
Glen Harris for bringing up, that there is a new dibusb-device and Jiun-Kuei
|
|
Jung from AVerMedia who kindly provided a special firmware to get the device
|
|
up and running in Linux.
|
|
|
|
Jennifer Chen, Jeff and Jack from Twinhan for kindly supporting by
|
|
writing the vp7045-driver.
|
|
|
|
Steve Chang from WideView for providing information for new devices and
|
|
firmware files.
|
|
|
|
Michael Paxton for submitting remote control keymaps.
|
|
|
|
Some guys on the linux-dvb mailing list for encouraging me.
|
|
|
|
Peter Schildmann >peter.schildmann-nospam-at-web.de< for his
|
|
user-level firmware loader, which saves a lot of time
|
|
(when writing the vp7041 driver)
|
|
|
|
Ulf Hermenau for helping me out with traditional chinese.
|
|
|
|
André Smoktun and Christian Frömmel for supporting me with
|
|
hardware and listening to my problems very patiently.
|