Re: device states supported by current drivers

[Bharata B Rao <rao.bharata-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>]

Knut Neumann wrote:
> Am Mo, 2003-08-11 um 03.28 schrieb Bharata B Rao:
>>
>>Are there any device drivers in 2.4/2.6 kernels which actually support 
>>different low power states as defined by ACPI ? The reason I ask is I 
>>can't really see any device actually implementing the new driver model 
>>suspend routine which is used by ACPI.
> 
> 
> What about the e100 driver? See drivers/net/e100/e100_main.c
> 

Ok, I can see that now. Thanks.

Two more dumb questions (sorry for asking them here in devel list)

1. When a particular sleep state (S1 - S5) is entered via 
/proc/acpi/sleep, the devices are put to one of the D states (D0 - D3)
 From the code (device_suspend, e100_suspend, pci_set_power_state), it 
looks like the sleep states (Sx) are directly translated to device 
states (Dx) when it comes to device suspend. i,e., when I say enter S2, 
it will lead to device entering to D2. Is this how it should be ?

2. Is there no interface exported by ACPI to control the devices 
independently. i,e., can't I just control the power state of a device 
from user space ? Currently I can see it only happens via 
/proc/acpi/sleep, which is for controlling the entire system sleep state.

Regards,
Bharata.



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