Ok, it would be just like the alsa and pcscd caos.
Anyway, i thought it was because "Linus" did not wanted.
Thanks.
On 26-01-2012 12:40, Bastien Nocera wrote:
On Thu, 2012-01-26 at 12:03 -0200, Fausto Carvalho Marques Silva wrote:
Hi folks,
i have an old dout about the fingerprint scanner support in the linux
world.
Why does the fingerprint scanners drivers are all written in the user
space with libusb and
not in the kernel space? It would be more easy to configure in ".config"
and wide availble if
it were in the kernel configuration. Many other things seens to be
inside the kernel but not
fingerprint scanners. Do you have any explanation for this (historical
or technical?
Simple. Most USB devices with custom protocols are implemented in
user-space because it means that you can avoid having to create a
framework, with much stricter API requirements, in the kernel. If you
were to write kernel drivers, and got the API done, you would probably
need user-space daemons/libraries to talk to the driver.
Finally, user-space is interesting because it means that it works on any
platform where libusb works, including Windows, MacOS X and the *BSDs.
Fausto Carvalho Marques Silva
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