kopia lustrzana https://gitlab.com/sane-project/website
Added link to information about libusb permissions as more and more questions
about the move from Linux 2.4 to 2.6 are asked on sane-devel and elsewhere.merge-requests/1/head
Henning Geinitz
rodzic
8a0030fae0
commit
50620f17a0
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Information about USB scanners:
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================================
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With Linux 2.4.* you could either use the kernel scanner module or libusb to
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access USB scanners. In Linux 2.6.4 the kernel scanner module was removed.
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Therefore with this and later kernels libusb must be used.
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While SANE automatically uses libusb when the library and its header file were
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present during the build of sane-backends, setting permissions will require
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some attention.
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The device files used by libusb are located in /proc/bus/usb/
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(e.g. /proc/bus/usb/001/003). The exact file name can be found out by running
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sane-find-scanner which would print "libusb:001:003" in this case. While
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setting permissions with e.g. "chmod a+rw /proc/bus/usb/001/003" seems to work,
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this change is not permanent. The permissions will be reset when the scanner is
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replugged or Linux is rebooted.
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One solution to set permissions on-the-fly are the Linux hot-plug tools that
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should come with any current distribution. SANE itsself comes with a hotplug
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script and related documentaion in the tools/hotplug/ directory. Please refer to
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the README in that directory for the details.
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Information about SCSI scanners:
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================================
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Under Linux, your kernel must have generic SCSI support (sg) as well as a
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driver for your SCSI adapter. You may want to increase the SCSI buffer size
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to increase scan speed. Details on all of the above can be found in
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sane-scsi(5).
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If your SCSI and sg driver are build as moduls you will need to load them
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with modprobe:
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# modprobe your-driver-name
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# modprobe sg
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You may find error messages in /var/log/messages. Look at the documentation
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for your SCSI driver. Maybe you need to add options like the io port.
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Now the SCSI adapter and your scanner should be visible at /proc/scsi/scsi.
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Example:
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# cat /proc/scsi/scsi
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Host: scsi0 Channel: 00 Id: 06 Lun: 00
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Vendor: SCANNER Model: Rev: 2.02
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Type: Scanner ANSI SCSI revision: 01 CCS
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In this case the real vendor and scanner name are not shown (Mustek
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Scannexpress 12000SP) but SANE will detect it nevertheless.
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If your scanner is supported by SANE, scanimage -L will list it now:
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# scanimage -L
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device mustek:/dev/scanner' is a Mustek ScanExpress 12000SP flatbed scanner
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If this doesn't work you may have to add the right SCSI generic device name
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to the configuration file. This should be documented in the man page for
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your backend. To find out about the right SCSI device use sane-find-scanner:
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# sane-find-scanner
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found SCSI scanner "SCANNER 2.02" at /dev/scanner
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found SCSI scanner "SCANNER 2.02" at /dev/sg0
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found SCSI scanner "SCANNER 2.02" at /dev/sga
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It may help to set a symbolic link /dev/scanner to the respective device if
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automatic detection does not work.
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If you need more information on the Linux SCSI subsystem, look at
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http://www.torque.net/scsi/linux_scsi_24/index.html. Although this
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documentation is about the 2.4 kernels, large parts are also valid for
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older kernels. One important exception is the section on "Device Names
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in devfs".
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Adaptec 1542 SCSI adapter:
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Using buffer sizes of more than 32768 bytes with the aha1542 driver can
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lead to kernel panic with older kernels. To avoid this, run configure with
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the option --enable-scsibuffersize or set the environment variable
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SANE_SG_BUFFERSIZE to 32768 before running scanimage or another frontend,
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or download and install the SG driver 2.1.37 or newer from
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http://www.torque.net/sg.
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idescsi:
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The Linux kernel "Emulation of a SCSI host adapter for IDE ATAPI
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devices" (idescsi) is reported to cause problems in connection with
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SANE. If your scanner isn't found or you encounter segmentation faults
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try to disable idescsi.
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SCSI Direct IO: Recent versions of the Linux SG driver for the 2.4 kernels
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support direct IO, i.e., the SCSI adapter's DMA chip copies data directly
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to/from user memory. Direct IO reduces memory usage, but it can lead to
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access conflicts, if a backend uses shared memory. SANE does not use
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direct IO by default. If you want to use it, run
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configure --enable-scsi-directio=yes
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Very old Linux distributions are missing the /usr/include/scsi directory. In
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such a case, it is necessary to copy the relevant files from the kernel
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distribution. Normally, the command:
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cp -a /usr/src/linux/include/scsi /usr/include
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should fix this problem. Don't do this if you don't get compilation errors
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about missing SCSI headers.
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Other Information
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=================
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Excessive warnings "pointer of type `void *' used in arithmetic":
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Some older versions of glibc generate these warnings not related to SANE
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source code. To suppress these warnings do
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export CFLAGS="-g -O2 -D__NO_STRING_INLINES"
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and rerun configure.
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If you use DEC cc on Linux Alpha, you may need to set LDFLAGS="-N" to
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be able to build sane-backends.
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The Intel C++ Compiler for IA32 and IA64 isn't supported yet. If you want
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to try nevertheless, you will experience undefined references to inb
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and outb functions. To avoid those replace #include <sys/io.h> with
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#if defined(__ICC) && __ICC >= 700
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# define __GNUC__ 2
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#endif
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#include <sys/io.h>
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#if defined(__ICC) && __ICC >= 700
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# undef __GNUC__
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#elif defined(__ICC) && defined(HAVE_ASM_IO_H)
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# include <asm/io.h>
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#endif
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@ -46,6 +46,10 @@
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<h2>FAQ, HOWTO, Tutorial, Saned</h2>
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<ul>
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<li>
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Trouble with SANE and USB scanners when updating from Linux 2.4 to 2.6?
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Read <a href="README.linux">README.linux</a>.
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</li>
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<li>
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<a href="http://www.xs4all.nl/~ljm/SANE-faq.html" target="_top">Frequently Asked Questions
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(FAQ)</a>: The SANE FAQ was originally created by Nicolas de Peslouan and is now maintained
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@ -36,6 +36,11 @@
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<td valign=top bgcolor="#e0e0ff" width="300">
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<h3>Latest News</h3>
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<p>
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<strong>2004-04-21:</strong> If you have trouble with SANE and USB
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scanners when updating from Linux 2.4 to 2.6 please read <a
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href="README.linux">README.linux</a> first.
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</p>
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<p>
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<strong>2004-04-17:</strong> sane-frontends 1.0.12 has been
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released. It now supports GIMP 2.0 and GTK 2.0. See <a
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