[Trac #555] Add PM event for battery status change

[Zarro Boogs per Child]

#555: Add PM event for battery status change
-------------------------+--------------------------------------------------
 Reporter:  krstic       |        Owner:  ted.juan
     Type:  enhancement  |       Status:  new     
 Priority:  normal       |    Milestone:  BTest-2 
Component:  hardware     |   Resolution:          
 Keywords:               |  
-------------------------+--------------------------------------------------
Comment (by ted.juan):

 Hi Jim,

 This problem is the same with ticket #224.

 There is no ACPI feature in OLPC Spec.

 Qunata need your proposal to add it in the EC code.
 [[BR]]
 [[BR]]




 This is what ACPI does: (through 0x62/0x66 port)


 1) EC detects the AC/battery  insert/remove or battery percentage change,
 it assert EC SCI

 2) OS get a SCI. If it comes from EC SCI then it will send query embedded
 controller(QR_EC) command (0x84) to EC

 3) EC will place a notitification byte in output buffer

 4) OS get the notification byte and run the relative _Qxx to process it


 ACPI sample code

 Device(EC0) {

 Name(_GPE,0x9) //EC SCI connect to GPE.9

 ….
 Method(_Q08) {Notify(\_SB.AC, 0x00)} //AC in/out

 //Method(_Q09) {Notify(\_TZ.THRM, 0x80)}  //Thermal

 Method(_Q0B) {Notify(\_SB.BAT0, 0x80)}     //Batt in/out

 Method(_Q0C) {Notify(\_SB.LID, 0x80)} //Lid close

 //Method(_Q0D) {Notify(\_SB.SLPB, 0x80)}  //Hotkey

 //Method(_Q0E) {Notify(\_SB.PWRB, 0x80)} //CM pwbtn

 }


     For OLPC design
 1) We can still use the SCI for the interrupt (BIOS program correctly)

 2) Define an query interface (0x62/0x66, 0x68/0x6c, or others?)

 3) Define a query command to get the notification byte (AC in/out...), we
 should
 consider more about Lid close...

 4) If it's battery related event, then battery driver retrieve the battery
 information

 5) Define the retrieve interface(0x380/0x381, or others)

 6) wakeup event -- using SWI?


 Ted

-- 
Ticket URL: <http://dev.laptop.org/ticket/555#comment:4>
One Laptop Per Child <http://laptop.org/>