Re: Rework of request firmware

[Kay Sievers <kay.sievers@vrfy.org>]

On Sun, 2005-03-20 at 11:47 -0500, Jon Smirl wrote:
> On Sun, 20 Mar 2005 14:37:16 +0100, Kay Sievers <kay.sievers@vrfy.org> wrote:
> > I still would like to see clearly defined list of requirements for:
> >   o async userspace data-requests into the kernel
> >   o async userspace configuration-requests from the kernel
> 
> Here's another model that might be more general...
> 
> accept_user_data() -- adds the data/status attributes to the device sysfs entry
> 
> request_helper(completion, environment string) -- causes
> ACTION=helper, the environment string is added onto the normal
> environment for an event from this device class. Only async version.
> 
> In the completion routine...
> release_user_data() -- deletes the attributes, frees the data
> 
> This model addresses both the need to receive data and run helpers
> that don't need data.

Ok, let's collect what's need to get that:

o Emit events for devices to request a userspace-action on that
  device like copying data into a sysfs file or run a userspace
  program to setup this device.
  -Is this limited to physical devices?

o Events can happen anytime, no only on device creation time.

o We need an efficient way for the dumb hotplug-multiplexer to recognize
  that kind of events to prevent the execution of just another script
  for every hotplug event.

o The events should act asynchronously and the kernel should detect or is
  to be notified that the request has finished.
  -Do we need any timeout here?

o For data-loading-requests like the firmware case we need to be able to
  request more than one file for one single device.

o The DEVPATH of the request should be the device itself, that asks for data
  or setup.
  -Should the requests create a own child at the device directory or just
   attributes there?
  -How should attributes be named if we have multiple request for the
   same device?

Thanks,
Kay



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