On Thu, Sep 22, 2016 at 10:21 AM, Joao Pinto [off-list ref] wrote:

Hi!

I am designing an application that has the goal to be an utility for Unipro and
UFS testing purposes. This application is going to run on top of a recent Linux
Kernel containing the new UFS stack (including the new DWC drivers).

I am considering doing the following:
a) Create a new config item called CONFIG_UFS_CHARDEV which is going to create a
char device responsible to make some IOCTL available for user-space applications
b) Create a linux/ufs.h header file that contains data structures declarations
that will be needed in user-space applications

I am not very familiar with UFS devices, that said you should have an
sgX chardev being created already so you can handle SG_IO requests.
There also appear to be some sysfs entries being created.

So between sg and sysfs you should be able to handle any user-space
out of band requests without resorting to making a new chardev.

Adding more sysfs entries, if you need them, should be fine.

You may find it easier to expand on the existing interfaces than to
get consensus on a new driver and ioctls.

Hope this helps,
Shaun

Could you please advise me about what the correct approach should be to make it
as standard as possible and usable in the future?

Thank you very much for your help!

regards,
Joao
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Shaun Tancheff