GPIO device class driver

GPIO device class driver

[NZG]

I am currently developing support for an ep9xx based SBC and want to export
it's GPIO through sysfs in a simple and standard way,
without adding yet another platform specific gpio driver to the kernel.

As I understand it, a gpio class has already been begun by Robert Schwebel in
but has not as of yet become part of the mainstream kernel.

Searching the archives for this yields no results since 2006.

Can anyone point me to a current patch? 
I'd like to start from there.

thank you,
NZG

Re: GPIO device class driver

[Kumar Gala]

On Wed, 1 Feb 2006, Robert Schwebel wrote:

> On Wed, Feb 01, 2006 at 01:00:27AM -0600, Kumar Gala wrote:
> > Any further progress on this.  I'm looking at the GPIO's on an  
> > embedded PowerPC and would prefer to produce a driver towards a  
> > standard kernel interface.  I'm also happy to help on the standard  
> > interface if it needs some work.
> 
> Sorry, no progress so far on our side. 

Is there a list of things to do?

- kumar

Re: GPIO device class driver

[Ivan Korzakow]

[-- Attachment #1: Type: text/plain, Size: 1111 bytes --]

2006/2/1, Robert Schwebel <robert@schwebel.de>:
> On Wed, Feb 01, 2006 at 01:00:27AM -0600, Kumar Gala wrote:
> > Any further progress on this.  I'm looking at the GPIO's on an
> > embedded PowerPC and would prefer to produce a driver towards a
> > standard kernel interface.  I'm also happy to help on the standard
> > interface if it needs some work.
>
> Sorry, no progress so far on our side.
>

Hi,

I worked on a GPIO driver, starting from the work of Robert Schwebel.
I wrote something that suited my needs, but I kept in mind the idea of
a generic layer. It's worth what it's worth, but i'm sending it in
case it might help someone.
Basically I nearly didn't touch the sysfs part of Robert's driver. I
added the possibility to register a block of GPIO pins, and to handle
interrupts. The platform specific layer registers itself with this
generic layer and passes all the required platform dependant functions
and parameters through a struct.
Attached is the generic layer gpio.c and I moved the header in
include/linux/gpio.h
Feel free to comment, criticize, reject  :-)

Ivan

[-- Attachment #2: gpio.tgz --]
[-- Type: application/x-gzip, Size: 5882 bytes --]

Re: GPIO device class driver

[Robert Schwebel]

On Wed, Feb 01, 2006 at 01:00:27AM -0600, Kumar Gala wrote:
> Any further progress on this.  I'm looking at the GPIO's on an  
> embedded PowerPC and would prefer to produce a driver towards a  
> standard kernel interface.  I'm also happy to help on the standard  
> interface if it needs some work.

Sorry, no progress so far on our side. 

Robert
-- 
 Dipl.-Ing. Robert Schwebel | http://www.pengutronix.de
 Pengutronix - Linux Solutions for Science and Industry
   Handelsregister:  Amtsgericht Hildesheim, HRA 2686
     Hannoversche Str. 2, 31134 Hildesheim, Germany
   Phone: +49-5121-206917-0 |  Fax: +49-5121-206917-9

Re: GPIO device class driver

[Kumar Gala]

On Dec 21, 2005, at 5:50 AM, Robert Schwebel wrote:

> Ivan,
>
> On Wed, Dec 21, 2005 at 12:07:27PM +0100, Ivan Korzakow wrote:
>> I read about a generic device class driver (http:// 
>> marc.theaimsgroup.com/?l=
>> linux-kernel&m=109419719600753&w=2) for GPIO. I wanted to know if  
>> anything
>> generic finally came out of the dicussion ?
>> I'm willing to write a gpio driver and I am considering taking  
>> Robert Schwebel
>> patch into it if nothing exist in the main line.
>
> As far as I know there is nothing new available yet; the LED framework
> people have don some things, but it should be "above" GPIO. This  
> morning
> we have discussed serveral things which could be improved in our code;
> if you are interested I'll keep you informed about the progress.
>
> Robert

Any further progress on this.  I'm looking at the GPIO's on an  
embedded PowerPC and would prefer to produce a driver towards a  
standard kernel interface.  I'm also happy to help on the standard  
interface if it needs some work.

- kumar

Re: GPIO device class driver

[Robert Schwebel]

Ivan, 

On Wed, Dec 21, 2005 at 12:07:27PM +0100, Ivan Korzakow wrote:
> I read about a generic device class driver (http://marc.theaimsgroup.com/?l=
> linux-kernel&m=109419719600753&w=2) for GPIO. I wanted to know if anything
> generic finally came out of the dicussion ?
> I'm willing to write a gpio driver and I am considering taking Robert Schwebel
> patch into it if nothing exist in the main line.

As far as I know there is nothing new available yet; the LED framework
people have don some things, but it should be "above" GPIO. This morning
we have discussed serveral things which could be improved in our code;
if you are interested I'll keep you informed about the progress. 

Robert
-- 
 Dipl.-Ing. Robert Schwebel | http://www.pengutronix.de
 Pengutronix - Linux Solutions for Science and Industry
   Handelsregister:  Amtsgericht Hildesheim, HRA 2686
     Hannoversche Str. 2, 31134 Hildesheim, Germany
   Phone: +49-5121-206917-0 |  Fax: +49-5121-206917-9

GPIO device class driver

[Ivan Korzakow]

Hi,
I read about a generic device class driver
(http://marc.theaimsgroup.com/?l=linux-kernel&m=109419719600753&w=2)
for GPIO. I wanted to know if anything generic finally came out of the
dicussion ?
I'm willing to write a gpio driver and I am considering taking Robert
Schwebel patch into it if nothing exist in the main line.

Thanks in advance for any info.

Ivan