05-31-2011
Quote:
Originally Posted by
SDoroshenko
Linux provides flow control for USB modems so all the packets reach destination without loss.
That doesn't mean it knows anything more than that, or even that it's the same for everything. What the buffer is and how it's used would depend on the hardware.
Quote:
It means Linux knows when modem buffer is full. It would be good to know how Linux checks it.
What the buffer is and how it's used would depend on the hardware. The details would be in the driver.
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LEARN ABOUT REDHAT
usbmodules
usbmodules(8) Linux USB Utilities usbmodules(8)
NAME
usbmodules - List kernel driver modules available for a plugged in USB device
SYNOPSIS
usbmodules [--device /proc/bus/bus/NNN/NNN] [--check modulename] [--help] [--mapfile pathname] [--version pathname]
DESCRIPTION
usbmodules lists driver modules that may be able to manage interfaces on currently plugged in USB devices. usbmodules may be used by
/sbin/hotplug or one of its agents (normally /etc/hotplug/usb.agent) when USB devices are "hot plugged" into the system. This can be done
by the following Bourne shell syntax:
for module in $(usbmodules --device $DEVICE) ; do
modprobe -s -k "$module"
done
The DEVICE environment variable is passed from the kernel to /sbin/hotplug during USB hotplugging if the kernel was configured using usbde-
vfs. usbmodules currently requires usbdevfs to operate.
When a USB device is removed from the system, the Linux kernel will decrement a usage count on USB driver module. If this count drops to
zero (i.e., there are no clients for the USB device driver), then the modprobe -r process that is normally configured to run from cron
every few minutes will eventually remove the unneeded module.
OPTIONS
--check modulename
Instead of listing the relevant modules, just exit with code 0 (success) if the given module's exported USB ID patterns matches.
Otherwise, return failure. usbmodules emits no output either way.
--device /proc/bus/usb/MMM/NNN
Selects which device usbmodules will examine. The argument is currently mandatory.
--help, -h
Print a help message
--mapfile /etc/hotplug/usb.handmap
Use the specified file instead of the /lib/modules/.../modules.usbmap file corresponding to the running kernel.
--version
Identifies the version of usbutils this tool was built with.
FILES
/lib/modules/<kernel-version>/modules.usbmap
This file is automatically generated by depmod, versions 2.4.2 and later, and is used by usbmodules to determine which modules cor-
respond to which USB ID's.
/proc/bus/usb
An optional interface to USB devices provided by Linux kernels with versions of the 2.4 USB support. Contains per-bus subdirectories
with per-device files (offering a usermode driver API as well as access to device and configuration descriptors), a devices file
containing a list of all USB devices, and a drivers file listing USB device drivers known to the USB subsystem.
SEE ALSO
lsusb(8), http://linux-hotplug.sourceforge.net
AUTHOR
usbmodules was written by Adam J. Richter <adam@yggdrasil.com>, and is based partly on lsusb, which was written by Thomas Sailer
<sailer@ife.ee.ethz.ch>.
COPYRIGHT
usbmodules is copyright 2000, Yggdrasil Computing, Incorporated, and copyright 1999, Thomas Sailer. usbmodules may may be copied under the
terms and conditions of version 2 of the GNU General Public License as published by the Free Software Foundation (Cambrige, Massachusetts,
United States of America).
usbutils-0.8 12 June 2001 usbmodules(8)