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+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 (TODO) 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
+  controller)
+- other functions/methods which can be shared by several drivers (such as
+  functions for bulk-control-commands)
+
+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/dvb/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 USB1.1
+========================
+
+Produced and reselled by Twinhan:
+---------------------------------
+- TwinhanDTV USB-Ter DVB-T Device (VP7041)
+        http://www.twinhan.com/product_terrestrial_3.asp
+
+- TwinhanDTV Magic Box (VP7041e)
+        http://www.twinhan.com/product_terrestrial_4.asp
+
+- HAMA DVB-T USB device
+        http://www.hama.de/portal/articleId*110620/action*2598
+
+- CTS Portable (Chinese Television System) (2)
+        http://www.2cts.tv/ctsportable/
+
+- Unknown USB DVB-T device with vendor ID Hyper-Paltek
+
+
+Produced and reselled by KWorld:
+--------------------------------
+- KWorld V-Stream XPERT DTV DVB-T USB
+        http://www.kworld.com.tw/en/product/DVBT-USB/DVBT-USB.html
+
+- JetWay DTV DVB-T USB
+        http://www.jetway.com.tw/evisn/product/lcd-tv/DVT-USB/dtv-usb.htm
+
+- ADSTech Instant TV DVB-T USB
+        http://www.adstech.com/products/PTV-333/intro/PTV-333_intro.asp?pid=PTV-333
+
+
+Others:
+-------
+- Ultima Electronic/Artec T1 USB TVBOX (AN2135, AN2235, AN2235 with Panasonic Tuner)
+        http://82.161.246.249/products-tvbox.html
+
+- Compro Videomate DVB-U2000 - DVB-T USB (2)
+        http://www.comprousa.com/products/vmu2000.htm
+
+- Grandtec USB DVB-T
+        http://www.grand.com.tw/
+
+- AVerMedia AverTV DVBT USB
+        http://www.avermedia.com/
+
+- DiBcom USB DVB-T reference device (non-public)
+
+
+Supported devices USB2.0-only
+=============================
+- Twinhan MagicBox II
+        http://www.twinhan.com/product_terrestrial_7.asp
+
+- TwinhanDTV Alpha
+        http://www.twinhan.com/product_terrestrial_8.asp
+
+- DigitalNow TinyUSB 2 DVB-t Receiver
+        http://www.digitalnow.com.au/DigitalNow%20tinyUSB2%20Specifications.html
+
+- Hanftek UMT-010
+        http://www.globalsources.com/si/6008819757082/ProductDetail/Digital-TV/product_id-100046529
+
+
+Supported devices USB2.0 and USB1.1
+=============================
+- Typhoon/Yakumo/HAMA/Yuan DVB-T mobile USB2.0
+        http://www.yakumo.de/produkte/index.php?pid=1&ag=DVB-T
+        http://www.yuan.com.tw/en/products/vdo_ub300.html
+        http://www.hama.de/portal/articleId*114663/action*2563
+        http://www.anubisline.com/english/articlec.asp?id=50502&catid=002
+
+- Artec T1 USB TVBOX (FX2) (2)
+
+- Hauppauge WinTV NOVA-T USB2
+        http://www.hauppauge.com/
+
+- KWorld/ADSTech Instant DVB-T USB2.0 (DiB3000M-B)
+
+- DiBcom USB2.0 DVB-T reference device (non-public)
+
+- AVerMedia AverTV A800 DVB-T USB2.0
+
+1) It is working almost - work-in-progress.
+2) No test reports received yet.
+
+0. History & News:
+  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 predessors 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 (Unkown, 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 start working.
+
+for USB1.1 (AN2135) you need: dvb-usb-dibusb-5.0.0.11.fw
+for USB2.0 HanfTek: dvb-usb-umt-010-02.fw
+for USB2.0 DiBcom: dvb-usb-dibusb-6.0.0.8.fw
+for USB2.0 AVerMedia AverTV DVB-T USB2: dvb-usb-avertv-a800-01.fw
+for USB2.0 TwinhanDTV Alpha/MagicBox II: dvb-usb-vp7045-01.fw
+
+The files can be found on http://www.linuxtv.org/download/firmware/ .
+
+We do not have the permission (yet) to publish the following firmware-files.
+You'll need to extract them from the windows drivers.
+
+You should be able to use "get_dvb_firmware dvb-usb" to get the firmware:
+
+for USB1.1 (AN2235) (a few Artec T1 devices): dvb-usb-dibusb-an2235-01.fw
+for USB2.0 Hauppauge: dvb-usb-nova-t-usb2-01.fw
+for USB2.0 ADSTech/Kworld USB2.0: dvb-usb-adstech-usb2-01.fw
+for USB2.0 Yakumo/Typhoon/Hama: dvb-usb-dtt200u-01.fw
+
+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 withing 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.
+
+   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.
+
+   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 patient.