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

[Stephen Hemminger <schemminger@comcast.net>]

Michael Frank wrote:

> 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

I sent them a patch that converts the PCI device to the device model and
uses suspend/resume hooks.  But they didn't seem to put it in the 
current version