Commit 88008266 authored by Peter Chen's avatar Peter Chen Committed by Greg Kroah-Hartman
Browse files

Doc: ABI: add usb charger uevent 



When the USB charger is inserted or removed, the users could get
USB charger state and type through the uevent.

Signed-off-by: default avatarPeter Chen <peter.chen@nxp.com>
Link: https://lore.kernel.org/r/1579145333-1657-2-git-send-email-peter.chen@nxp.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3bdcfe6c

Documentation/ABI/testing/usb-charger-uevent

0 → 100644
+46 −0
Original line number Diff line number Diff line 
What:		Raise a uevent when a USB charger is inserted or removed

Date:		2020-01-14

KernelVersion:	5.6

Contact:	linux-usb@vger.kernel.org

Description:	There are two USB charger states:

		USB_CHARGER_ABSENT

		USB_CHARGER_PRESENT

		There are five USB charger types:

		USB_CHARGER_UNKNOWN_TYPE: Charger type is unknown

		USB_CHARGER_SDP_TYPE: Standard Downstream Port

		USB_CHARGER_CDP_TYPE: Charging Downstream Port

		USB_CHARGER_DCP_TYPE: Dedicated Charging Port

		USB_CHARGER_ACA_TYPE: Accessory Charging Adapter

		https://www.usb.org/document-library/battery-charging-v12-spec-and-adopters-agreement



		Here are two examples taken using udevadm monitor -p when

		USB charger is online:

		UDEV  change   /devices/soc0/usbphynop1 (platform)

		ACTION=change

		DEVPATH=/devices/soc0/usbphynop1

		DRIVER=usb_phy_generic

		MODALIAS=of:Nusbphynop1T(null)Cusb-nop-xceiv

		OF_COMPATIBLE_0=usb-nop-xceiv

		OF_COMPATIBLE_N=1

		OF_FULLNAME=/usbphynop1

		OF_NAME=usbphynop1

		SEQNUM=2493

		SUBSYSTEM=platform

		USB_CHARGER_STATE=USB_CHARGER_PRESENT

		USB_CHARGER_TYPE=USB_CHARGER_SDP_TYPE

		USEC_INITIALIZED=227422826



		USB charger is offline:

		KERNEL change   /devices/soc0/usbphynop1 (platform)

		ACTION=change

		DEVPATH=/devices/soc0/usbphynop1

		DRIVER=usb_phy_generic

		MODALIAS=of:Nusbphynop1T(null)Cusb-nop-xceiv

		OF_COMPATIBLE_0=usb-nop-xceiv

		OF_COMPATIBLE_N=1

		OF_FULLNAME=/usbphynop1

		OF_NAME=usbphynop1

		SEQNUM=2494

		SUBSYSTEM=platform

		USB_CHARGER_STATE=USB_CHARGER_ABSENT

		USB_CHARGER_TYPE=USB_CHARGER_UNKNOWN_TYPE

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