What: Raise a uevent when a USB charger is inserted or removed
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Date: 2020-01-14
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KernelVersion: 5.6
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Contact: linux-usb@vger.kernel.org
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Description: There are two USB charger states:
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- USB_CHARGER_ABSENT
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- USB_CHARGER_PRESENT
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There are five USB charger types:
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======================== ==========================
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USB_CHARGER_UNKNOWN_TYPE Charger type is unknown
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USB_CHARGER_SDP_TYPE Standard Downstream Port
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USB_CHARGER_CDP_TYPE Charging Downstream Port
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USB_CHARGER_DCP_TYPE Dedicated Charging Port
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USB_CHARGER_ACA_TYPE Accessory Charging Adapter
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======================== ==========================
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https://www.usb.org/document-library/battery-charging-v12-spec-and-adopters-agreement
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Here are two examples taken using ``udevadm monitor -p`` when
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USB charger is online::
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UDEV change /devices/soc0/usbphynop1 (platform)
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ACTION=change
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DEVPATH=/devices/soc0/usbphynop1
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DRIVER=usb_phy_generic
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MODALIAS=of:Nusbphynop1T(null)Cusb-nop-xceiv
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OF_COMPATIBLE_0=usb-nop-xceiv
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OF_COMPATIBLE_N=1
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OF_FULLNAME=/usbphynop1
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OF_NAME=usbphynop1
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SEQNUM=2493
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SUBSYSTEM=platform
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USB_CHARGER_STATE=USB_CHARGER_PRESENT
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USB_CHARGER_TYPE=USB_CHARGER_SDP_TYPE
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USEC_INITIALIZED=227422826
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USB charger is offline::
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KERNEL change /devices/soc0/usbphynop1 (platform)
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ACTION=change
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DEVPATH=/devices/soc0/usbphynop1
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DRIVER=usb_phy_generic
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MODALIAS=of:Nusbphynop1T(null)Cusb-nop-xceiv
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OF_COMPATIBLE_0=usb-nop-xceiv
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OF_COMPATIBLE_N=1
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OF_FULLNAME=/usbphynop1
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OF_NAME=usbphynop1
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SEQNUM=2494
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SUBSYSTEM=platform
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USB_CHARGER_STATE=USB_CHARGER_ABSENT
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USB_CHARGER_TYPE=USB_CHARGER_UNKNOWN_TYPE
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