Fwd: [Swsusp-devel] Kernel 2.6 pm_send_all() issues.

[Michael Frank <mhf@linuxmail.org>]

This question is probably better suited for LKML.

----------  Forwarded Message  ----------

Subject: [Swsusp-devel] Kernel 2.6 pm_send_all() issues.
Date: Tuesday 10 February 2004 04:06
From: Wolfgang Glas <wolfgang.glas@ev-i.at>
To: swsusp-devel@lists.sourceforge.net

Coming back to an earlier post, which states, that NVidia suspend/resume under 
2.6.x could be resurrected, if  drivers_suspend() and drivers_resume() in 
swsusp.c are tuned in a way, that pm_send_all() is called, I want to direct 
the following question to more eligible persons in this list:

  I inspected NVidia's driver and I found out, that it's implemented as a 
character device and hence does not implement the suspend/resume kernel 
driver interface, which has been introduced in linux-2.6. But nevertheless 
this driver has the ability to register its own power management handler 
through pm_register(), an interface already present in linux-2.4 and still 
used in some 20 drivers present in the linux-2.6.1 code base, most notable 
some audio driver and some irda drivers.

  Diving further into the code, I recognized, that the kernel function 
ppm_send_all(), which calls all handlers registered through pm_register() is 
never called inside of swsusp2.c

  So, what I want to ask is, whether the pm_register/pm_send/pm_send_all 
interface is simply deprecated and the NVidia driver (and other drivers, 
which use pm_register) should be reeingineered in order to use the 
resume/suspend interface of linux-2.6. Or should we try to modify swsusp2.c 
in a way, that it additionally calls  pm_send_all for these drivers?

   TIA,

      Wolfgang


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