V2 API

V2 API

[David Goodenough]

Doing a Google search looking to see if there was userland support
for SMBALERT messages I saw references to the V2 API which last year
was "being developed".  Did this happen, and is it defined anywhere?

David

Re: V2 API

[David Goodenough]

On Wednesday 28 Sep 2011, David Goodenough wrote:
> Doing a Google search looking to see if there was userland support
> for SMBALERT messages I saw references to the V2 API which last year
> was "being developed".  Did this happen, and is it defined anywhere?
> 
> David
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I take it from the fact that no-one has replied, that the V2 API is
not being worked on or has stalled.  Is there any way using the
existing API for userland code to be notified of an incomming 
SMBALERT?

David

Re: V2 API

[Jean Delvare]

On Fri, 30 Sep 2011 11:34:38 +0100, David Goodenough wrote:
> On Wednesday 28 Sep 2011, David Goodenough wrote:
> > Doing a Google search looking to see if there was userland support
> > for SMBALERT messages I saw references to the V2 API which last year
> > was "being developed".  Did this happen, and is it defined anywhere?
> 
> I take it from the fact that no-one has replied, that the V2 API is
> not being worked on or has stalled.

I take it from the fact that no-one has replied, that "V2 API" is an
awfully vague subject line, so odds are that nobody read your post in
the first place. Try to come up with a better subject line next time.

> Is there any way using the
> existing API for userland code to be notified of an incomming 
> SMBALERT?

Not that I know of, and I wasn't even aware that efforts had ever been
ongoing to achieve this.

-- 
Jean Delvare

Re: V2 API

[David Goodenough]

On Friday 30 Sep 2011, Jean Delvare wrote:
> On Fri, 30 Sep 2011 11:34:38 +0100, David Goodenough wrote:
> > On Wednesday 28 Sep 2011, David Goodenough wrote:
> > > Doing a Google search looking to see if there was userland support
> > > for SMBALERT messages I saw references to the V2 API which last year
> > > was "being developed".  Did this happen, and is it defined anywhere?
> > 
> > I take it from the fact that no-one has replied, that the V2 API is
> > not being worked on or has stalled.
> 
> I take it from the fact that no-one has replied, that "V2 API" is an
> awfully vague subject line, so odds are that nobody read your post in
> the first place. Try to come up with a better subject line next time.
It was the only name I found for any effort to address this problem.
And that was from a message which I think was on this mailing list about
a year ago.
> 
> > Is there any way using the
> > existing API for userland code to be notified of an incomming
> > SMBALERT?
> 
> Not that I know of, and I wasn't even aware that efforts had ever been
> ongoing to achieve this.
So I take it that the only way to do this would be to write a kernel
driver?

David

Re: V2 API

[Jean Delvare]

On Fri, 30 Sep 2011 12:28:06 +0100, David Goodenough wrote:
> On Friday 30 Sep 2011, Jean Delvare wrote:
> > On Fri, 30 Sep 2011 11:34:38 +0100, David Goodenough wrote:
> > > On Wednesday 28 Sep 2011, David Goodenough wrote:
> > > > Doing a Google search looking to see if there was userland support
> > > > for SMBALERT messages I saw references to the V2 API which last year
> > > > was "being developed".  Did this happen, and is it defined anywhere?
> > > 
> > > I take it from the fact that no-one has replied, that the V2 API is
> > > not being worked on or has stalled.
> > 
> > I take it from the fact that no-one has replied, that "V2 API" is an
> > awfully vague subject line, so odds are that nobody read your post in
> > the first place. Try to come up with a better subject line next time.
> It was the only name I found for any effort to address this problem.

And...? You couldn't come up with a subject line at least mentioning
"SMBus" and/or "alert"?

> And that was from a message which I think was on this mailing list about
> a year ago.
> > 
> > > Is there any way using the
> > > existing API for userland code to be notified of an incomming
> > > SMBALERT?
> > 
> > Not that I know of, and I wasn't even aware that efforts had ever been
> > ongoing to achieve this.
> So I take it that the only way to do this would be to write a kernel
> driver?

At the moment, yes. It would technically be possible to do it in
user-space, I presume, by extending the i2c-dev driver to register a
proper driver with alert callback. But this would require a significant
redesign of the i2c-dev driver, which I am not up to for the time
being. An alternative would be a simple sysfs attribute in the i2c
adapter's directory in the device tree, which user-space could poll
until an event triggers. I don't know what the plan was.

-- 
Jean Delvare