1What:		Raise a uevent when a USB charger is inserted or removed
2Date:		2020-01-14
3KernelVersion:	5.6
4Contact:	linux-usb@vger.kernel.org
5Description:	There are two USB charger states:
6		USB_CHARGER_ABSENT
7		USB_CHARGER_PRESENT
8		There are five USB charger types:
9		USB_CHARGER_UNKNOWN_TYPE: Charger type is unknown
10		USB_CHARGER_SDP_TYPE: Standard Downstream Port
11		USB_CHARGER_CDP_TYPE: Charging Downstream Port
12		USB_CHARGER_DCP_TYPE: Dedicated Charging Port
13		USB_CHARGER_ACA_TYPE: Accessory Charging Adapter
14		https://www.usb.org/document-library/battery-charging-v12-spec-and-adopters-agreement
15
16		Here are two examples taken using udevadm monitor -p when
17		USB charger is online:
18		UDEV  change   /devices/soc0/usbphynop1 (platform)
19		ACTION=change
20		DEVPATH=/devices/soc0/usbphynop1
21		DRIVER=usb_phy_generic
22		MODALIAS=of:Nusbphynop1T(null)Cusb-nop-xceiv
23		OF_COMPATIBLE_0=usb-nop-xceiv
24		OF_COMPATIBLE_N=1
25		OF_FULLNAME=/usbphynop1
26		OF_NAME=usbphynop1
27		SEQNUM=2493
28		SUBSYSTEM=platform
29		USB_CHARGER_STATE=USB_CHARGER_PRESENT
30		USB_CHARGER_TYPE=USB_CHARGER_SDP_TYPE
31		USEC_INITIALIZED=227422826
32
33		USB charger is offline:
34		KERNEL change   /devices/soc0/usbphynop1 (platform)
35		ACTION=change
36		DEVPATH=/devices/soc0/usbphynop1
37		DRIVER=usb_phy_generic
38		MODALIAS=of:Nusbphynop1T(null)Cusb-nop-xceiv
39		OF_COMPATIBLE_0=usb-nop-xceiv
40		OF_COMPATIBLE_N=1
41		OF_FULLNAME=/usbphynop1
42		OF_NAME=usbphynop1
43		SEQNUM=2494
44		SUBSYSTEM=platform
45		USB_CHARGER_STATE=USB_CHARGER_ABSENT
46		USB_CHARGER_TYPE=USB_CHARGER_UNKNOWN_TYPE
47