[Xenomai] RTDM - Dynamic linking of device

[Xenomai] RTDM - Dynamic linking of device

[alex alex]

Hi,

I need to link new devices once my module is loaded and I'd like to know if
we can do this with RTDM?
Are we forced to link the device in the "_init" fonction ? Or is there an
other way to do the connection device/driver than using
rtdm_dev_register<http://www.xenomai.org/documentation/trunk/html/api/group__devregister.html#ga6a191b3d206680c48cad2047adb9fc98>wich
doesn't allow to do what I want?

Thanks for your answer.

Alex.

Re: [Xenomai] RTDM - Dynamic linking of device

[Gilles Chanteperdrix]

On 12/13/2012 10:21 AM, alex alex wrote:

> Hi,
> 
> I need to link new devices once my module is loaded and I'd like to know if
> we can do this with RTDM?
> Are we forced to link the device in the "_init" fonction ?


If you link the device in the "_init" function it will link the new
device once the module is loaded.

> Or is there an
> other way to do the connection device/driver than using
> rtdm_dev_register<http://www.xenomai.org/documentation/trunk/html/api/group__devregister.html#ga6a191b3d206680c48cad2047adb9fc98>wich
> doesn't allow to do what I want?


I do not really understand what you are talking about. If something does
not work, please post code demonstrating what does not work.

-- 
                                                                Gilles.

Re: [Xenomai] RTDM - Dynamic linking of device

[Gilles Chanteperdrix]

On 12/16/2012 03:01 AM, alex alex wrote:

> Infact, I wonder if it is possible with RTDM to add devices after the
> module is loaded.
> My module is used by programs that do not allow me to know in advance
> how many device linked to the module there will be and what will be
> their name.
> With "rtdm_dev_register" I have to declare statically a fixed number of
> device with a fixed name for each so I wonder if there is a dynamic way
> to add device after the module loading.




I do not understand what prevents you from calling rtdm_dev_register
with dynamic parameters... Again, please post the code which does not
work to help us understand what your problem is.

-- 
                                                                Gilles.

Re: [Xenomai] RTDM - Dynamic linking of device

[Gilles Chanteperdrix]

On 12/18/2012 03:38 PM, alex alex wrote:
> Thanks for your answer, I have corrected the example program.
>
> What I would like to do is add x devices after that the module be loaded
> and without naming these devices statically in the module, so am I forced
> to call x times rtdm_dev_register with x declarations of the rtdm_device
> structure in test.c?
> If there is an other way, please tell me what it is.

What about creating a first static device with an ioctl allowing to 
create other devices?

-- 
					    Gilles.

Re: [Xenomai] RTDM - Dynamic linking of device

[alex alex]

Infact I thought "rtdm_dev_register" worked exclusively in the _init
function as indicated by the documentation. Following your advice I have
tested  "rtdm_dev_register" in another function of my RTDM driver (ioctl)
and it works well.

I think you might change the doc of rtdm_dev_register to :

This service can be called from:

   - Kernel module initialization/cleanup code
   - Kernel-based task

Same for rtdm_dev_unregister

Alex.
2012/12/18 Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>

> On 12/18/2012 03:38 PM, alex alex wrote:
>
>> Thanks for your answer, I have corrected the example program.
>>
>> What I would like to do is add x devices after that the module be loaded
>> and without naming these devices statically in the module, so am I forced
>> to call x times rtdm_dev_register with x declarations of the rtdm_device
>> structure in test.c?
>> If there is an other way, please tell me what it is.
>>
>
> What about creating a first static device with an ioctl allowing to create
> other devices?
>
> --
>                                             Gilles.
>
> ______________________________**_________________
> Xenomai mailing list
> Xenomai@xenomai.org
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>

Re: [Xenomai] RTDM - Dynamic linking of device

[Philippe Gerum]

On 12/19/2012 10:39 AM, alex alex wrote:
> Infact I thought "rtdm_dev_register" worked exclusively in the _init
> function as indicated by the documentation. Following your advice I have
> tested  "rtdm_dev_register" in another function of my RTDM driver (ioctl)
> and it works well.
>
> I think you might change the doc of rtdm_dev_register to :
>
> This service can be called from:
>
>     - Kernel module initialization/cleanup code
>     - Kernel-based task
>
> Same for rtdm_dev_unregister
>

Nope. Kernel-based task in the context of Xenomai means a primary mode 
context over a lightweight Xenomai task, which is not what you want. 
Kernel module init/cleanup code implies secondary mode, this is the gist 
of the matter. This may be made clearer in the doc though.

> Alex.
> 2012/12/18 Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
>
>> On 12/18/2012 03:38 PM, alex alex wrote:
>>
>>> Thanks for your answer, I have corrected the example program.
>>>
>>> What I would like to do is add x devices after that the module be loaded
>>> and without naming these devices statically in the module, so am I forced
>>> to call x times rtdm_dev_register with x declarations of the rtdm_device
>>> structure in test.c?
>>> If there is an other way, please tell me what it is.
>>>
>>
>> What about creating a first static device with an ioctl allowing to create
>> other devices?
>>
>> --
>>                                              Gilles.
>>
>> ______________________________**_________________
>> Xenomai mailing list
>> Xenomai@xenomai.org
>> http://www.xenomai.org/**mailman/listinfo/xenomai<http://www.xenomai.org/mailman/listinfo/xenomai>
>>
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>


-- 
Philippe.