[PATCH 3/6] input: Add support for VIA VT8500 and compatibles in i8042

[Alexey Charkov]

2010/10/31 Ben Dooks <ben-linux at fluff.org>:
> On 20/10/10 21:55, Alexey Charkov wrote:
>> VIA and WonderMedia Systems-on-Chip feature a standard i8042-compatible
>> keyboard and mouse controller. This adds necessary glue to enable use
>> of the standard driver with these systems.
>>
>> Signed-off-by: Alexey Charkov <alchark at gmail.com>
>> ---
>>
>> Please review and state whether this could be acceptable for a merge
>> to mainline in the coming 2.6.37 window. If possible, I would deeply
>> appreciate a merge to a relevant git tree for integration prior to
>> asking Linus to pull the changes. I could rebase the code if needed,
>> currently this is against Linus' master branch.
>>
>> This patch relies on the basic architecture support for VT8500/WM8505
>> to be in place, as introduced by PATCH 1/6 in this series.
>>
>> Due credits go to the community for providing feedback, advice and
>> testing.
>>
>> NB: The development is being done at:
>> http://gitorious.org/linux-on-via-vt8500/vt8500-kernel
>>
>> Relevant code may be pulled from a git tree in there.
>>
>>  drivers/input/serio/Kconfig        |    3 +-
>>  drivers/input/serio/i8042-vt8500.h |   71 ++++++++++++++++++++++++++++++++++++
>>  drivers/input/serio/i8042.h        |    2 +
>>  3 files changed, 75 insertions(+), 1 deletions(-)
>>  create mode 100644 drivers/input/serio/i8042-vt8500.h
>>
>> diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
>> index 3bfe8fa..2b86774 100644
>> --- a/drivers/input/serio/Kconfig
>> +++ b/drivers/input/serio/Kconfig
>> @@ -21,7 +21,8 @@ if SERIO
>>  config SERIO_I8042
>>       tristate "i8042 PC Keyboard controller" if EMBEDDED || !X86
>>       default y
>> -     depends on !PARISC && (!ARM || ARCH_SHARK || FOOTBRIDGE_HOST) && \
>> +     depends on !PARISC && \
>> +               (!ARM || ARCH_SHARK || ARCH_VT8500 || FOOTBRIDGE_HOST) && \
>>                  (!SUPERH || SH_CAYMAN) && !M68K && !BLACKFIN
>
> this looks like someone could do with a HAS_SERIO_I8042 Kconfig entry
> and have the relevant archs select it instead of having this mess.
>
>

True, it would make things much cleaner. However, that's probably out
of scope of adding VT8500 support here, thus not for me to decide :)

<snip>

>
> yeurk... how about having a core i8042 implementation and having
> a structure with the necessary callbacks for the code, so that
> we don't end up having to select what is builtin for the system
> we're compiling for?
>

I would really like to see this implemented as a standard platform
driver (accepting resources and platform_data as necessary). This
would be a way cleaner approach, with less code duplication and less
patching of the driver itself whenever a new platform is to be added.
However, I don't know how that kind of a change would affect other
arches.

> --
> Ben
>

Thanks,
Alexey