On Mon, Jun 22, 2020 at 12:48:07AM +0200, Paul Cercueil wrote: > Register a power supply charger, if the Kconfig option > USB_CONN_GPIO_CHARGER is set, whose online state depends on whether > the USB role is set to device or not. > > This is useful when the USB role is the only way to know if the device > is charging from USB. The API is the standard power supply charger API, > you get a /sys/class/power_supply/xxx/online node which tells you the > state of the charger. > > The sole purpose of this is to give userspace applications a way to > know whether or not the charger is plugged. > > Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx> > --- > drivers/usb/common/Kconfig | 11 +++++++ > drivers/usb/common/usb-conn-gpio.c | 47 ++++++++++++++++++++++++++++++ > 2 files changed, 58 insertions(+) > > diff --git a/drivers/usb/common/Kconfig b/drivers/usb/common/Kconfig > index d611477aae41..5405ae96c68f 100644 > --- a/drivers/usb/common/Kconfig > +++ b/drivers/usb/common/Kconfig > @@ -49,3 +49,14 @@ config USB_CONN_GPIO > > To compile the driver as a module, choose M here: the module will > be called usb-conn-gpio.ko > + > +if USB_CONN_GPIO > + > +config USB_CONN_GPIO_CHARGER > + bool "USB charger support" > + select POWER_SUPPLY > + help > + Register a charger with the power supply subsystem. This will allow > + userspace to know whether or not the device is charging from USB. Why make this an option at all? Why wouldn't we always want this here? As this is a charger, exporting that information to userspace should probably always happen, right? thanks, greg k-h
