On Tue, Jul 21, 2020 at 06:21:20PM +0800, ivan wrote: > On Tue, Jul 21, 2020 at 4:19 PM Greg KH <gre...@linuxfoundation.org> wrote: > > > > On Tue, Jul 21, 2020 at 01:59:36PM +0800, Qiwu Huang wrote: > > > From: Qiwu Huang <huangq...@xiaomi.com> > > > > > > reports wireless signal strength. > > > The value show degree of coupling between tx and rx. > > > > > > Signed-off-by: Qiwu Huang <huangq...@xiaomi.com> > > > --- > > > Documentation/ABI/testing/sysfs-class-power | 10 ++++++++++ > > > drivers/power/supply/power_supply_sysfs.c | 1 + > > > include/linux/power_supply.h | 1 + > > > 3 files changed, 12 insertions(+) > > > > > > diff --git a/Documentation/ABI/testing/sysfs-class-power > > > b/Documentation/ABI/testing/sysfs-class-power > > > index 03ab449fae8a..75ec7de2fe78 100644 > > > --- a/Documentation/ABI/testing/sysfs-class-power > > > +++ b/Documentation/ABI/testing/sysfs-class-power > > > @@ -757,3 +757,13 @@ Description: > > > 13: ADAPTER_VOICE_BOX, > > > 14: ADAPTER_PRIVATE_PD_50W. > > > > > > +What: > > > /sys/class/power_supply/<supply_name>/signal_strength > > > +Date: Jul 2020 > > > +Contact: Fei Jiang <jiangf...@xiaomi.com> > > > +Description: > > > + In PING phase, RX transmits a signal strength packet as the > > > first > > > > What does "PING phase" mean? > > The Qi Wireless Power Transfer System is published by the Wireless > Power Consortium. > The ping phase is the necessary stage for matching transmitter and > receiver. In this phase, > the Power Transmitter executes a Digital Ping, and listens for a > response. If the > Power Transmitter discovers a Power Receiver, the Power Transmitter > may extend the Digital Ping, > i.e. maintain the Power Signal at the level of the Digital Ping. This > causes the system to proceed to the > identification & configuration phase. If the Power Transmitter does > not extend the Digital Ping, the > system shall revert to the selection phase.
Thanks for the description, so perhaps turning this response into the text in the description would be good? thanks, greg k-h
