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Hi Alen, This question is regarding the power management in case of battery is low. Suppose if the battery is low, how the battery driver notifies the linux power management core to transition to low power state. How the linux power management addresses this issue? Thanks Raj > Date: Mon, 5 Jul 2010 09:51:55 -0400 > From: stern@xxxxxxxxxxxxxxxxxxx > To: rajkumar278@xxxxxxxxxxx > CC: linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx > Subject: RE: [linux-pm] About run time power management in linux > > On Mon, 5 Jul 2010, Raj Kumar wrote: > > > > > Hi Alan, > > > > > > > > I have few more questions about run time power management: > > > > > > > > 1) Please correct me if i am wrong. If there is a bus driver that is managing various power domains, > > > > and suppose this domain has some child devices. > > > > > > > > Then child has to inform run time Power management core i am idle and i want to go to get suspended, > > Strictly speaking, the child device doesn't do this -- its driver does. > > > then run time pm core will notify the bus driver of child and then bus driver calls the corresponding child's > > > > > > > > suspend. right? > > Right. In fact, that's true even when the bus driver manages only a > single power domain. > > > 2) run time power management can be done at device "type" and "class". But what does mean of this device > > > > type. what use cases are defined for run time power management for device "type"? > > Here are a couple of examples. In the USB subsystem there are two > "types": devices and interfaces. In the SCSI subsystem there are three > "types": hosts, targets, and LUNs. Each type generally needs to do > runtime power management differently. > > Alan Stern > |
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