Hi Greg,
Le mar. 21 juil. 2020 à 13:41, Greg Kroah-Hartman
<gregkh@xxxxxxxxxxxxxxxxxxx> a écrit :
> 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?
I wanted to avoid the hardcoded dependency on CONFIG_POWER_SUPPLY.
I can very well make that non-optional.
