x86-power-control

[Bills, Jason M]

Hi Vijay

On 10/16/2019 6:13 PM, Vijay Khemka wrote:
> One more question on code, I see following code requires powerButtonMask 
> to be set before aquiring GPIO line. Please let me know who sets this 
> powerButtonMask to true. I know this is related to GPIO passthrough but 
> still couldn’t understand where in code it gets set until someone call 
> set-property of dbus.

powerButtonMask is a gpiod::line object that returns true if it 
references a GPIO line and false otherwise.

> 
> power_control::powerButtonIface->register_property(
> 
> "ButtonMasked", false, [](constboolrequested, bool& current) {
> 
> if(requested)
> 
> {
> 
> if(power_control::powerButtonMask)
> 
> {
This will return if powerButtonMask already references a GPIO.

> 
> return1;
> 
> }
> 
> if(!power_control::setGPIOOutput(
> 
> "POWER_OUT", 1, power_control::powerButtonMask))
Otherwise, this will request the "POWER_OUT" GPIO and assign it to 
powerButtonMask (which will make it return true).

> 
> {
> 
> throwstd::runtime_error("Failed to request GPIO");
> 
> return0;
> 
> }
> 
> std::cerr << "Power Button Masked.\n";
> 
> }
> 
> else
> 
> {
> 
> if(!power_control::powerButtonMask)
> 
> {
This will return if powerButtonMask does not reference a GPIO line.

> 
> return1;
> 
> }
> 
> std::cerr << "Power Button Un-masked\n";
> 
> power_control::powerButtonMask.reset();
Otherwise this will reset powerButtonMask to release the "POWER_OUT" 
GPIO (which will make it return false).

> 
> }
> 
> Regards
> 
> -Vijay
>