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Stefan Richter db5f202d5d redirect Config ROM reads into the kernel's ROM cache 
The kernel already read each node's Configuration ROM and cached it.
So let all libraw1394 clients read from that cache instead of having
to perform all those transactions all over again.

This reduces bus traffic at application start-up and at each bus reset.
It also makes all Configuration ROM accesses fool-proof and robust.

This together with the kernel patch "firewire: core: handle ack_busy
when fetching the Config ROM" lets me use an old Panasonic camcorder
which requires us to keep pauses between response and request ---
longer than librom1394's retry pause --- with dvgrab (though still
with frequent failures of write requests to FCP_COMMAND, i.e. with lots
of "send oops" noise in the console and occasionally having to repeat
key-presses in interactive mode).

For simplicity of implementation, only the blocking raw1394_read() is
modified, not the nonblocking raw1394_start_read().

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Dan Dennedy <dan@dennedy.org>
 		2011-08-21 20:25:50 +02:00
debian fix make dist without doc 2004-10-31 00:52:28 +00:00
doc doc: let "make clean" remove generated HTML files 2010-02-01 22:10:12 +01:00
src redirect Config ROM reads into the kernel's ROM cache 2011-08-21 20:25:50 +02:00
tools tools/dumpiso: Add write() return code checks, fix harmless format string bug 2010-09-07 11:26:55 +02:00
AUTHORS configure.ac, Changelog, NEWS etc.: update to version 2.0.6 2010-11-01 23:25:36 +01:00
COPYING.LIB Ensure this ends up in distributions. 2000-03-12 04:08:48 +00:00
ChangeLog configure.ac, Changelog, NEWS: update to version 2.0.7 2011-03-08 20:13:51 +01:00
INSTALL Reset the libtool age. 2008-07-18 01:08:30 -07:00
Makefile.am Fix build due to incomplete tarball. 2009-06-30 11:12:55 -07:00
NEWS configure.ac, Changelog, NEWS: update to version 2.0.7 2011-03-08 20:13:51 +01:00
README configure.ac, Changelog, NEWS etc.: update to version 2.0.6 2010-11-01 23:25:36 +01:00
autogen.sh Ooops...libtool works a bit different than I thought, but atleast it works 2003-07-13 01:27:13 +00:00
configure.ac configure.ac, Changelog, NEWS: update to version 2.0.7 2011-03-08 20:13:51 +01:00
libraw1394.pc.in pkgconfig include path should not contain libraw1394 2004-11-20 04:56:36 +00:00
libraw1394.spec.in bump versions, build fixes, and doc updates 2004-10-30 22:49:27 +00:00

README 

				   libraw1394
				   ==========

1. About libraw1394

	libraw1394 is the only supported interface to the kernel side raw1394 of
the Linux IEEE-1394 subsystem, which provides direct access to the connected
1394 buses to user space.  Through libraw1394/raw1394, applications can directly
send to and receive from other nodes without requiring a kernel driver for the
protocol in question.

	The reason for making a library the interface to the kernel is to avoid
a program dependency on the kernel version, which would hinder development and
optimization of raw1394.  If development changed the protocol and made it
incompatible with previous versions only the libraw1394 has to be upgraded to
match the kernel version (instead of all applications).

	Since version 2, libraw1394 also works with the kernel driver
firewire-core.  libraw1394's role has thus become that of a raw1394
compatibility layer for existing applications when running on firewire-core.


2. Copyleft

	libraw1394 itself is licensed under the Lesser General Public License
(short LGPL, see file COPYING.LIB in the source distribution).  Other files in
the source archives not belonging to but being part of the build procedure of
libraw1394 are under their own licenses, as stated at the top of the individual
files.


3. API documentation

	Finally there is something, in the doc subdirectory.  The file is
libraw1394.sgml (it's Docbook format), and there are preformatted PostScript and
HTML available.  This documentation is not complete yet.


4. Multithreading

	This library should be multithreadable with the restriction that one
raw1394handle_t may be used only within a single thread.  Multiple threads
operating on the same handle would royally mess up the kernel-user protocol.
Simply use separate handles for each thread in which you need to use libraw1394.


5. Pkg-config

	The library comes with a pkg-config .pc file, so you can check for
libraw1394 and its version in your configure script.  For example, here is how 
to use the autoconf macro:

PKG_CHECK_MODULES(LIBRAW1394, libraw1394 >= 1.1.0)

	This macro sets the variables LIBRAW1394_CFLAGS and LIBRAW1394_LIBS.  You 
have to include those into your build variables so that the build process 
correctly links with libraw1394.


6. Contact

	Send questions, suggestions, bug reports and patches to the mailing
list linux1394-devel@lists.sourceforge.net.  This list is open for posting
without prior subscription, and replies will usually be Cc'd to you.  Visit
http://ieee1394.wiki.kernel.org/ for links to list subscription interfaces and
list archives.

	Maintainer of libraw1394 is currently Stefan Richter.  See the file
AUTHORS for a complete list of contributors to libraw1394.

	Source repository:
git://git.kernel.org/pub/scm/libs/ieee1394/libraw1394.git
http://git.kernel.org/pub/scm/libs/ieee1394/libraw1394.git
https://git.kernel.org/pub/scm/libs/ieee1394/libraw1394.git

	Gitweb:
http://git.kernel.org/?p=libs/ieee1394/libraw1394.git

	Release tarballs:
https://www.kernel.org/pub/linux/libs/ieee1394/
ftp://ftp.kernel.org/pub/linux/libs/ieee1394/