This changes some method and stuff, in order to make all input and
output be cset-based. This solves a number of issues with the previous
setup. Thus, even drivers must be made differentlym abd this fixes
zio-zero accordingly.

As a side effect, we have a data_done method in trigger ops, so the device
can tell when it is done. And the fire_trigger returns void, since it
cannot wait for stuff to be done. See documentation for details.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Federico Vaga <federico.vaga@gmail.com>

docs for general-cset

Federico Vaga authored 13 years ago and Alessandro Rubini committed 13 years ago

zio invokes try_module_get() on buffer, trigger and device owners when
they are in use. For devices we still have a little unsafe time.

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>
Acked-by: Alessandro Rubini <rubini@gnudd.com>

A trigger instance has flags too, and the create functions
set the flag in bot bi and ti. And channels inherit from cset.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Federico Vaga <federico.vaga@gmail.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Federico Vaga <federico.vaga@gmail.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Federico Vaga <federico.vaga@gmail.com>

Federico Vaga authored 13 years ago and Alessandro Rubini committed 13 years ago

From this commit onwards the whole thing compiles and works (from
2.6.34 onwards). We chose to save you from the past history of
internal zio development.

Signed-off by: Federico Vaga <federico.vaga@gmail.com>
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Federico Vaga authored 13 years ago and Alessandro Rubini committed 13 years ago

This is a working driver, with one cset and three channels that return
8-bit data. It is the demonstration that the ZIO abstraction is a good
way to avoid complexity in the low-level drivers.

Signed-off by: Federico Vaga <federico.vaga@gmail.com>
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>