"The Linux USB Project, originally started in early 1999, is
currently the definitive USB stack for Linux. Originally based upon
a debug USB mouse driver that Linus wrote and released March 30,
1999, it rapidly progressed into a state of acceptable maturity.
The current version supports much more than the UHCI controller and
USB mouse combination supported by this early implementation, and
has become a part of the latest kernel releases."
"Throughout the summer of 1999, development expanded, adding
support for OCHI compliant controllers, HID keyboards, mice and
preliminary storage, audio and video support. Recently, some of the
biggest changes have come from the switch over from a synchronous
driver to an asynchronous driver. This is also known as the URB
change over, and has allowed for easier interfacing between the
device drivers and the USB stack."
"Even though they have kept affected source code inside
their own directory, the Linux USB Project promises to bring about
changes in the kernel. To properly utilize the full
capabilities of USB, the drivers all had to be written to allow hot
connecting and disconnecting. While this works great for hardware
that is not being used all the time, peripherals such as mice where
the mouse server, which usually loads at boot time, will refuse to
run if it cannot find a mouse. Resulting hacks in the mouse driver
allow this to work (by keeping the driver open even if no mouse is
connected), but other hardware is not as easy. Linux drivers have
never particularly liked the hot-swapping of hardware, which the
USB spec is designed for."
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