libi2c device probing capability

[Gedare Bloom]

Alex,

Can you resend with git-send-email? Also, please be sure to use the
same style as the rest of the file, or the RTEMS Style rules
otherwise. In particular, use { on same line as if, and spaces around
().

Other than style, I think this looks ok.

Gedare


On Wed, Apr 1, 2015 at 10:31 AM, Alexandru-Sever Horin
<alex.sever.h at gmail.com> wrote:
> Hello,
>
> I am currently working on a project which uses I2C devices through libi2c
> API.
>
> The problem that I am facing is that this function:
> rtems_libi2c_register_drv actually registeres the device before
> drvtbl->ops->initialization_entry returns success or failure. This means
> that it is impossible to probe a device which might be at 2 different I2C
> addreses on different PCB revisions.
>
> For a device driver with no initialization function it should make no
> difference, the function call being ignored, and the minor being returned.
> If the device driver has a initialization function, it calls it and makes
> sure that the return value is 0 before registering the name. If it returns
> something different than RTEMS_SUCCESS, it makes sure the driver
> registration returns negative error code (so it's not mistaken with minor
> number), and does not register the device driver.
>
> I have attached a patch to solve this problem, and bypass device
> registration in the filesystem if the initialziation fails.
> Please review the changes and merge if you agree.
>
> Thank you,
> Alex H.
>
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