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Diffstat (limited to 'Documentation/ABI/testing/usb-charger-uevent')
| -rw-r--r-- | Documentation/ABI/testing/usb-charger-uevent | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/usb-charger-uevent b/Documentation/ABI/testing/usb-charger-uevent new file mode 100644 index 000000000..1db89b0cf --- /dev/null +++ b/Documentation/ABI/testing/usb-charger-uevent @@ -0,0 +1,54 @@ +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 |