Merge kernel.org:/pub/scm/linux/kernel/git/mchehab/v4l-dvb.git with fixups

This merges the DVB tree, but fixes up the history that had gotten
screwed up by a broken commit.

The history is fixed up by re-doing the commit properly (taking the
resolve from the final result of the original), and then cherry-picking
the commits that followed the broken merge.

* dvb: (190 commits)
  V4L/DVB (3545): Fixed no_overlay option and quirks on saa7134 driver
  V4L/DVB (3543): Fix Makefile to adapt to bt8xx/ conversion
  V4L/DVB (3538): Bt8xx documentation update
  V4L/DVB (3537a): Whitespace cleanup
  V4L/DVB (3533): Add WSS (wide screen signalling) module parameters
  V4L/DVB (3532): Moved duplicated code of ALPS BSRU6 tuner to a standalone file.
  V4L/DVB (3530): Kconfig: remove VIDEO_AUDIO_DECODER
  V4L/DVB (3529): Kconfig: add menu items for cs53l32a and wm8775 A/D converters
  V4L/DVB (3528): Kconfig: fix ATSC frontend menu item names by manufacturer
  V4L/DVB (3527): VIDEO_CPIA2 must depend on USB
  V4L/DVB (3525): Kconfig: remove VIDEO_DECODER
  V4L/DVB (3524): Kconfig: add menu items for saa7115 and saa7127
  V4L/DVB (3494): Kconfig: select VIDEO_MSP3400 to build msp3400.ko
  V4L/DVB (3522): Fixed a trouble with other PAL standards
  V4L/DVB (3521): Avoid warnings at video-buf.c
  V4L/DVB (3514): SAA7113 doesn't have auto std chroma detection mode
  V4L/DVB (3513): Remove saa711x driver
  V4L/DVB (3509): Make a needlessly global function static.
  V4L/DVB (3506): Cinergy T2 dmx cleanup on disconnect
  V4L/DVB (3504): Medion 7134: Autodetect second bridge chip
  ...

Signed-off-by: Linus Torvalds <torvalds@osdl.org>

10 files changed, 279 insertions, 112 deletions

diff --git a/Documentation/dvb/avermedia.txt b/Documentation/dvb/avermedia.txt
index 068070ff13cd..8bab8461a4af 100644
--- a/Documentation/dvb/avermedia.txt
+++ b/Documentation/dvb/avermedia.txt
@@ -1,4 +1,3 @@
-
 HOWTO: Get An Avermedia DVB-T working under Linux
            ______________________________________________
 
@@ -137,11 +136,8 @@ Getting the card going
    To  power  up  the  card,  load  the  following modules in the
    following order:
 
-     * insmod dvb-core.o
-     * modprobe bttv.o
-     * insmod bt878.o
-     * insmod dvb-bt8xx.o
-     * insmod sp887x.o
+     * modprobe bttv (normally loaded automatically)
+     * modprobe dvb-bt8xx (or place dvb-bt8xx in /etc/modules)
 
    Insertion  of  these  modules  into  the  running  kernel will
    activate the appropriate DVB device nodes. It is then possible
@@ -302,4 +298,4 @@ Further Update
    Many  thanks to Nigel Pearson for the updates to this document
    since the recent revision of the driver.
 
-   January 29th 2004
+   February 14th 2006
diff --git a/Documentation/dvb/bt8xx.txt b/Documentation/dvb/bt8xx.txt
index 52ed462061df..4e7614e606c5 100644
--- a/Documentation/dvb/bt8xx.txt
+++ b/Documentation/dvb/bt8xx.txt
@@ -1,118 +1,78 @@
-How to get the Nebula, PCTV, FusionHDTV Lite and Twinhan DST cards working
-==========================================================================
+How to get the bt8xx cards working
+==================================
 
-This class of cards has a bt878a as the PCI interface, and
-require the bttv driver.
+1) General information
+======================
 
-Please pay close attention to the warning about the bttv module
-options below for the DST card.
+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/dvb/cards.txt => o Cards based on the Conexant Bt8xx PCI bridge:
 
-1) General informations
-=======================
-
-These drivers require the bttv driver to provide the means to access
-the i2c bus and the gpio pins of the bt8xx chipset.
-
-Because of this, you need to enable
-"Device drivers" => "Multimedia devices"
-  => "Video For Linux" => "BT848 Video For Linux"
-
-Furthermore you need to enable
-"Device drivers" => "Multimedia devices" => "Digital Video Broadcasting Devices"
-  => "DVB for Linux" "DVB Core Support" "BT8xx based PCI cards"
+Compiling kernel please enable:
+a.)"Device drivers" => "Multimedia devices" => "Video For Linux" => "BT848 Video For Linux"
+b.)"Device drivers" => "Multimedia devices" => "Digital Video Broadcasting Devices"
+ => "DVB for Linux" "DVB Core Support" "Bt8xx based PCI Cards"
 
 2) Loading Modules
 ==================
 
-In general you need to load the bttv driver, which will handle the gpio and
-i2c communication for us, plus the common dvb-bt8xx device driver.
-The frontends for Nebula (nxt6000), Pinnacle PCTV (cx24110), TwinHan (dst),
-FusionHDTV DVB-T Lite (mt352) and FusionHDTV5 Lite (lgdt330x) are loaded
-automatically by the dvb-bt8xx device driver.
-
-3a) Nebula / Pinnacle PCTV / FusionHDTV Lite
----------------------------------------------
-
-   $ modprobe bttv (normally bttv is being loaded automatically by kmod)
-   $ modprobe dvb-bt8xx
-
-(or just place dvb-bt8xx in /etc/modules for automatic loading)
-
-
-3b) TwinHan and Clones
---------------------------
+In default cases bttv is loaded automatically.
+To load the backend either place dvb-bt8xx in etc/modules, or apply manually:
 
-   $ modprobe bttv card=0x71
-   $ modprobe dvb-bt8xx
-   $ modprobe dst
+        $ modprobe dvb-bt8xx
 
-The value 0x71 will override the PCI type detection for dvb-bt8xx,
-which  is necessary for TwinHan cards. Omission of this parameter might result
-in a system lockup.
+All frontends will be loaded automatically.
+People running udev please see Documentation/dvb/udev.txt.
 
-If you're having an older card (blue color PCB) and card=0x71 locks up
-your machine, try using 0x68, too. If that does not work, ask on the
-mailing list.
+In the following cases overriding the PCI type detection for dvb-bt8xx might be necessary:
 
-The DST module takes a couple of useful parameters.
+2a) Running TwinHan and Clones
+------------------------------
 
-verbose takes values 0 to 4. These values control the verbosity level,
-and can be used to debug also.
+        $ modprobe bttv card=113
+        $ modprobe dvb-bt8xx
+        $ modprobe dst
 
-verbose=0 means complete disabling of messages
-        1 only error messages are displayed
-        2 notifications are also displayed
-        3 informational messages are also displayed
-        4 debug setting
+Useful parameters for verbosity level and debugging the dst module:
 
-dst_addons takes values 0 and 0x20. A value of 0 means it is a FTA card.
-0x20 means it has a Conditional Access slot.
+verbose=0:              messages are disabled
+        1:              only error messages are displayed
+        2:              notifications are displayed
+        3:              other useful messages are displayed
+        4:              debug setting
+dst_addons=0:           card is a free to air (FTA) card only
+           0x20:        card has a conditional access slot for scrambled channels
 
-The autodetected values are determined by the cards 'response string'
-which you can see in your logs e.g.
+The autodetected values are determined by the cards' "response string".
+In your logs see f. ex.: dst_get_device_id: Recognize [DSTMCI].
+For bug reports please send in a complete log with verbose=4 activated.
+Please also see Documentation/dvb/ci.txt.
 
-dst_get_device_id: Recognise [DSTMCI]
-
-If you need to sent in bug reports on the dst, please do send in a complete
-log with the verbose=4 module parameter. For general usage, the default setting
-of verbose=1 is ideal.
-
-
-4) Multiple cards
+2b) Running multiple cards
 --------------------------
 
-If you happen to be running multiple cards, it would be advisable to load
-the bttv module with the card id. This would help to solve any module loading
-problems that you might face.
-
-For example, if you have a Twinhan and Clones card along with a FusionHDTV5 Lite
+Examples of card ID's:
 
-        $ modprobe bttv card=0x71 card=0x87
-
-Here the order of the card id is important and should be the same as that of the
-physical order of the cards. Here card=0x71 represents the Twinhan and clones
-and card=0x87 represents Fusion HDTV5 Lite. These arguments can also be
-specified in decimal, rather than hex:
+Pinnacle PCTV Sat:               94
+Nebula Electronics Digi TV:     104
+pcHDTV HD-2000 TV:              112
+Twinhan DST and clones:         113
+Avermedia AverTV DVB-T 771:     123
+Avermedia AverTV DVB-T 761:     124
+DViCO FusionHDTV DVB-T Lite:    128
+DViCO FusionHDTV 5 Lite:        135
 
+Notice: The order of the card ID should be uprising:
+Example:
         $ modprobe bttv card=113 card=135
+        $ modprobe dvb-bt8xx
 
-Some examples of card-id's
-
-Pinnacle Sat            0x5e  (94)
-Nebula Digi TV          0x68  (104)
-PC HDTV                 0x70  (112)
-Twinhan                 0x71  (113)
-FusionHDTV DVB-T Lite   0x80  (128)
-FusionHDTV5 Lite        0x87  (135)
-
-For a full list of card-id's, see the V4L Documentation within the kernel
-source:  linux/Documentation/video4linux/CARDLIST.bttv
-
-If you have problems with this please do ask on the mailing list.
+For a full list of card ID's please see Documentation/video4linux/CARDLIST.bttv.
+In case of further problems send questions to the mailing list: www.linuxdvb.org.
 
---
 Authors: Richard Walker,
          Jamie Honan,
          Michael Hunold,
          Manu Abraham,
+         Uwe Bugla,
          Michael Krufky
diff --git a/Documentation/dvb/get_dvb_firmware b/Documentation/dvb/get_dvb_firmware
index 75c28a174092..bb55f49f2745 100644
--- a/Documentation/dvb/get_dvb_firmware
+++ b/Documentation/dvb/get_dvb_firmware
@@ -21,8 +21,9 @@
 use File::Temp qw/ tempdir /;
 use IO::Handle;
 
-@components = ( "sp8870", "sp887x", "tda10045", "tda10046", "av7110", "dec2000t",
-                "dec2540t", "dec3000s", "vp7041", "dibusb", "nxt2002", "nxt2004",
+@components = ( "sp8870", "sp887x", "tda10045", "tda10046",
+                "tda10046lifeview", "av7110", "dec2000t", "dec2540t",
+                "dec3000s", "vp7041", "dibusb", "nxt2002", "nxt2004",
                 "or51211", "or51132_qam", "or51132_vsb", "bluebird");
 
 # Check args
@@ -126,6 +127,24 @@ sub tda10046 {
     $outfile;
 }
 
+sub tda10046lifeview {
+    my $sourcefile = "Drv_2.11.02.zip";
+    my $url = "http://www.lifeview.com.tw/drivers/pci_card/FlyDVB-T/$sourcefile";
+    my $hash = "1ea24dee4eea8fe971686981f34fd2e0";
+    my $outfile = "dvb-fe-tda10046.fw";
+    my $tmpdir = tempdir(DIR => "/tmp", CLEANUP => 1);
+
+    checkstandard();
+
+    wgetfile($sourcefile, $url);
+    unzip($sourcefile, $tmpdir);
+    extract("$tmpdir/LVHybrid.sys", 0x8b088, 24602, "$tmpdir/fwtmp");
+    verify("$tmpdir/fwtmp", $hash);
+    copy("$tmpdir/fwtmp", $outfile);
+
+    $outfile;
+}
+
 sub av7110 {
     my $sourcefile = "dvb-ttpci-01.fw-261d";
     my $url = "http://www.linuxtv.org/downloads/firmware/$sourcefile";
diff --git a/Documentation/dvb/readme.txt b/Documentation/dvb/readme.txt
index f5c50b22de3b..0b0380c91990 100644
--- a/Documentation/dvb/readme.txt
+++ b/Documentation/dvb/readme.txt
@@ -20,11 +20,23 @@ http://linuxtv.org/downloads/
 
 What's inside this directory:
 
+"avermedia.txt"
+contains detailed information about the
+Avermedia DVB-T cards. See also "bt8xx.txt".
+
+"bt8xx.txt"
+contains detailed information about the
+various bt8xx based "budget" DVB cards.
+
 "cards.txt"
 contains a list of supported hardware.
 
+"ci.txt"
+contains detailed information about the
+CI module as part from TwinHan cards and Clones.
+
 "contributors.txt"
-is the who-is-who of DVB development
+is the who-is-who of DVB development.
 
 "faq.txt"
 contains frequently asked questions and their answers.
@@ -34,19 +46,17 @@ script to download and extract firmware for those devices
 that require it.
 
 "ttusb-dec.txt"
-contains detailed informations about the
+contains detailed information about the
 TT DEC2000/DEC3000 USB DVB hardware.
 
-"bt8xx.txt"
-contains detailed installation instructions for the
-various bt8xx based "budget" DVB cards
-(Nebula, Pinnacle PCTV, Twinhan DST)
-
-"README.dibusb"
-contains detailed information about adapters
-based on DiBcom reference design.
-
 "udev.txt"
 how to get DVB and udev up and running.
 
+"README.dvb-usb"
+contains detailed information about the DVB USB cards.
+
+"README.flexcop"
+contains detailed information about the
+Technisat- and Flexcop B2C2 drivers.
+
 Good luck and have fun!
diff --git a/Documentation/video4linux/CARDLIST.cx88 b/Documentation/video4linux/CARDLIST.cx88
index 8bea3fbd0548..3b39a91b24bd 100644
--- a/Documentation/video4linux/CARDLIST.cx88
+++ b/Documentation/video4linux/CARDLIST.cx88
@@ -43,3 +43,5 @@
  42 -> digitalnow DNTV Live! DVB-T Pro                     [1822:0025]
  43 -> KWorld/VStream XPert DVB-T with cx22702             [17de:08a1]
  44 -> DViCO FusionHDTV DVB-T Dual Digital                 [18ac:db50,18ac:db54]
+ 45 -> KWorld HardwareMpegTV XPert                         [17de:0840]
+ 46 -> DViCO FusionHDTV DVB-T Hybrid                       [18ac:db40,18ac:db44]
diff --git a/Documentation/video4linux/CARDLIST.em28xx b/Documentation/video4linux/CARDLIST.em28xx
index a0c7cad20971..a3026689bbe6 100644
--- a/Documentation/video4linux/CARDLIST.em28xx
+++ b/Documentation/video4linux/CARDLIST.em28xx
@@ -8,3 +8,4 @@
   7 -> Leadtek Winfast USB II                   (em2800)
   8 -> Kworld USB2800                           (em2800)
   9 -> Pinnacle Dazzle DVC 90                   (em2820/em2840) [2304:0207]
+ 12 -> Kworld PVR TV 2800 RF                    (em2820/em2840)
diff --git a/Documentation/video4linux/CARDLIST.saa7134 b/Documentation/video4linux/CARDLIST.saa7134
index da4fb890165f..8c7195455963 100644
--- a/Documentation/video4linux/CARDLIST.saa7134
+++ b/Documentation/video4linux/CARDLIST.saa7134
@@ -83,3 +83,12 @@
  82 -> MSI TV@Anywhere plus                     [1462:6231]
  83 -> Terratec Cinergy 250 PCI TV              [153b:1160]
  84 -> LifeView FlyDVB Trio                     [5168:0319]
+ 85 -> AverTV DVB-T 777                         [1461:2c05]
+ 86 -> LifeView FlyDVB-T                        [5168:0301]
+ 87 -> ADS Instant TV Duo Cardbus PTV331        [0331:1421]
+ 88 -> Tevion/KWorld DVB-T 220RF                [17de:7201]
+ 89 -> ELSA EX-VISION 700TV                     [1048:226c]
+ 90 -> Kworld ATSC110                           [17de:7350]
+ 91 -> AVerMedia A169 B                         [1461:7360]
+ 92 -> AVerMedia A169 B1                        [1461:6360]
+ 93 -> Medion 7134 Bridge #2                    [16be:0005]
diff --git a/Documentation/video4linux/CARDLIST.tuner b/Documentation/video4linux/CARDLIST.tuner
index f6d0cf7b7922..1bcdac67dd8c 100644
--- a/Documentation/video4linux/CARDLIST.tuner
+++ b/Documentation/video4linux/CARDLIST.tuner
@@ -64,8 +64,10 @@ tuner=62 - Philips TEA5767HN FM Radio
 tuner=63 - Philips FMD1216ME MK3 Hybrid Tuner
 tuner=64 - LG TDVS-H062F/TUA6034
 tuner=65 - Ymec TVF66T5-B/DFF
-tuner=66 - LG NTSC (TALN mini series)
+tuner=66 - LG TALN series
 tuner=67 - Philips TD1316 Hybrid Tuner
 tuner=68 - Philips TUV1236D ATSC/NTSC dual in
-tuner=69 - Tena TNF 5335 MF
+tuner=69 - Tena TNF 5335 and similar models
 tuner=70 - Samsung TCPN 2121P30A
+tuner=71 - Xceive xc3028
+tuner=72 - Thomson FE6600
diff --git a/Documentation/video4linux/README.cpia2 b/Documentation/video4linux/README.cpia2
new file mode 100644
index 000000000000..ce8213d28b67
--- /dev/null
+++ b/Documentation/video4linux/README.cpia2
@@ -0,0 +1,130 @@
+$Id: README,v 1.7 2005/08/29 23:39:57 sbertin Exp $
+
+1. Introduction
+
+        This is a driver for STMicroelectronics's CPiA2 (second generation
+Colour Processor Interface ASIC) based cameras. This camera outputs an MJPEG
+stream at up to vga size. It implements the Video4Linux interface as much as
+possible.  Since the V4L interface does not support compressed formats, only
+an mjpeg enabled application can be used with the camera. We have modified the
+gqcam application to view this stream.
+
+        The driver is implemented as two kernel modules. The cpia2 module
+contains the camera functions and the V4L interface.  The cpia2_usb module
+contains usb specific functions.  The main reason for this was the size of the
+module was getting out of hand, so I separted them.  It is not likely that
+there will be a parallel port version.
+
+FEATURES:
+   - Supports cameras with the Vision stv6410 (CIF) and stv6500 (VGA) cmos
+     sensors. I only have the vga sensor, so can't test the other.
+   - Image formats: VGA, QVGA, CIF, QCIF, and a number of sizes in between.
+     VGA and QVGA are the native image sizes for the VGA camera. CIF is done
+     in the coprocessor by scaling QVGA.  All other sizes are done by clipping.
+   - Palette: YCrCb, compressed with MJPEG.
+   - Some compression parameters are settable.
+   - Sensor framerate is adjustable (up to 30 fps CIF, 15 fps VGA).
+   - Adjust brightness, color, contrast while streaming.
+   - Flicker control settable for 50 or 60 Hz mains frequency.
+
+2. Making and installing the stv672 driver modules:
+
+        Requirements:
+        -------------
+        This should work with 2.4 (2.4.23 and later) and 2.6 kernels, but has
+only been tested on 2.6.  Video4Linux must be either compiled into the kernel or
+available as a module.  Video4Linux2 is automatically detected and made
+available at compile time.
+
+        Compiling:
+        ----------
+        As root, do a make install.  This will compile and install the modules
+into the media/video directory in the module tree. For 2.4 kernels, use
+Makefile_2.4 (aka do make -f Makefile_2.4 install).
+
+        Setup:
+        ------
+        Use 'modprobe cpia2' to load and 'modprobe -r cpia2' to unload. This
+may be done automatically by your distribution.
+
+3. Driver options
+
+        Option          Description
+        ------          -----------
+        video_nr        video device to register (0=/dev/video0, etc)
+                        range -1 to 64.  default is -1 (first available)
+                        If you have more than 1 camera, this MUST be -1.
+        buffer_size     Size for each frame buffer in bytes (default 68k)
+        num_buffers     Number of frame buffers (1-32, default 3)
+        alternate       USB Alternate (2-7, default 7)
+        flicker_freq    Frequency for flicker reduction(50 or 60, default 60)
+        flicker_mode    0 to disable, or 1 to enable flicker reduction.
+                        (default 0). This is only effective if the camera
+                        uses a stv0672 coprocessor.
+
+        Setting the options:
+        --------------------
+        If you are using modules, edit /etc/modules.conf and add an options
+line like this:
+        options cpia2 num_buffers=3 buffer_size=65535
+
+        If the driver is compiled into the kernel, at boot time specify them
+like this:
+        cpia2.num_buffers=3 cpia2.buffer_size=65535
+
+        What buffer size should I use?
+        ------------------------------
+        The maximum image size depends on the alternate you choose, and the
+frame rate achieved by the camera.  If the compression engine is able to
+keep up with the frame rate, the maximum image size is given by the table
+below.
+        The compression engine starts out at maximum compression, and will
+increase image quality until it is close to the size in the table.  As long
+as the compression engine can keep up with the frame rate, after a short time
+the images will all be about the size in the table, regardless of resolution.
+        At low alternate settings, the compression engine may not be able to
+compress the image enough and will reduce the frame rate by producing larger
+images.
+        The default of 68k should be good for most users.  This will handle
+any alternate at frame rates down to 15fps.  For lower frame rates, it may
+be necessary to increase the buffer size to avoid having frames dropped due
+to insufficient space.
+
+                             Image size(bytes)
+        Alternate  bytes/ms   15fps    30fps
+            2         128      8533     4267
+            3         384     25600    12800
+            4         640     42667    21333
+            5         768     51200    25600
+            6         896     59733    29867
+            7        1023     68200    34100
+
+        How many buffers should I use?
+        ------------------------------
+        For normal streaming, 3 should give the best results.  With only 2,
+it is possible for the camera to finish sending one image just after a
+program has started reading the other.  If this happens, the driver must drop
+a frame.  The exception to this is if you have a heavily loaded machine.  In
+this case use 2 buffers.  You are probably not reading at the full frame rate.
+If the camera can send multiple images before a read finishes, it could
+overwrite the third buffer before the read finishes, leading to a corrupt
+image.  Single and double buffering have extra checks to avoid overwriting.
+
+4. Using the camera
+
+        We are providing a modified gqcam application to view the output. In
+order to avoid confusion, here it is called mview.  There is also the qx5view
+program which can also control the lights on the qx5 microscope. MJPEG Tools
+(http://mjpeg.sourceforge.net) can also be used to record from the camera.
+
+5. Notes to developers:
+
+   - This is a driver version stripped of the 2.4 back compatibility
+     and old MJPEG ioctl API. See cpia2.sf.net for 2.4 support.
+
+6. Thanks:
+
+   - Peter Pregler <Peter_Pregler@email.com>,
+     Scott J. Bertin <scottbertin@yahoo.com>, and
+     Jarl Totland <Jarl.Totland@bdc.no> for the original cpia driver, which
+     this one was modelled from.
diff --git a/Documentation/video4linux/cpia2_overview.txt b/Documentation/video4linux/cpia2_overview.txt
new file mode 100644
index 000000000000..a6e53665216b
--- /dev/null
+++ b/Documentation/video4linux/cpia2_overview.txt
@@ -0,0 +1,38 @@
+                        Programmer's View of Cpia2
+
+Cpia2 is the second generation video coprocessor from VLSI Vision Ltd (now a
+division of ST Microelectronics).  There are two versions.  The first is the
+STV0672, which is capable of up to 30 frames per second (fps) in frame sizes
+up to CIF, and 15 fps for VGA frames.  The STV0676 is an improved version,
+which can handle up to 30 fps VGA.  Both coprocessors can be attached to two
+CMOS sensors - the vvl6410 CIF sensor and the vvl6500 VGA sensor.  These will
+be referred to as the 410 and the 500 sensors, or the CIF and VGA sensors.
+
+The two chipsets operate almost identically.  The core is an 8051 processor,
+running two different versions of firmware.  The 672 runs the VP4 video
+processor code, the 676 runs VP5.  There are a few differences in register
+mappings for the two chips.  In these cases, the symbols defined in the
+header files are marked with VP4 or VP5 as part of the symbol name.
+
+The cameras appear externally as three sets of registers. Setting register
+values is the only way to control the camera.  Some settings are
+interdependant, such as the sequence required to power up the camera. I will
+try to make note of all of these cases.
+
+The register sets are called blocks.  Block 0 is the system block.  This
+section is always powered on when the camera is plugged in.  It contains
+registers that control housekeeping functions such as powering up the video
+processor.  The video processor is the VP block.  These registers control
+how the video from the sensor is processed.  Examples are timing registers,
+user mode (vga, qvga), scaling, cropping, framerates, and so on.  The last
+block is the video compressor (VC).  The video stream sent from the camera is
+compressed as Motion JPEG (JPEGA).  The VC controls all of the compression
+parameters.  Looking at the file cpia2_registers.h, you can get a full view
+of these registers and the possible values for most of them.
+
+One or more registers can be set or read by sending a usb control message to
+the camera.  There are three modes for this.  Block mode requests a number
+of contiguous registers.  Random mode reads or writes random registers with
+a tuple structure containing address/value pairs.  The repeat mode is only
+used by VP4 to load a firmware patch.  It contains a starting address and
+a sequence of bytes to be written into a gpio port.
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