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usbd(8) [osx man page]

usbd(8) 						    BSD System Manager's Manual 						   usbd(8)

NAME
usbd -- daemon for USB devices. SYNOPSIS
NONE (launched by launchd) DESCRIPTION
usbd allows the system to configure USB iOS devices to charge and to present notifications related to USB devices. This command is not intended to be invoked directly. FILES
/usr/libexec/usbd SEE ALSO
launchd(8) USBAgent(8) HISTORY
The usbd daemon first appeared in OS X 10.9. OS X
November 16, 2012 OS X

Check Out this Related Man Page

EHCI(4) 						   BSD Kernel Interfaces Manual 						   EHCI(4)

NAME
ehci -- USB Enhanced Host Controller driver SYNOPSIS
device ehci DESCRIPTION
The ehci driver provides support for the USB Enhanced Host Controller Interface, which is used by USB 2.0 controllers. EHCI controllers are peculiar in that they can only handle the USB 2.0 protocol. This means that they normally have one or more companion controllers (i.e., ohci(4) or uhci(4)) handling USB 1.x devices. Consequently each USB connector is electrically connected to two USB con- trollers. The handling of this is totally automatic, but can be noticed since USB 1.x and USB 2.0 devices plugged in to the same connector appear to connect to different USB busses. SEE ALSO
ohci(4), uhci(4), usb(4), xhci(4) HISTORY
The ehci device driver first appeared in FreeBSD 5.1. LOADER TUNABLES
When the kernel has been compiled with options USB_DEBUG, some tunables become available that affect the behavior of ehci. These tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5). hw.usb.ehci.lostintrbug This tunable enables the lost interrupt quirk. The default value is 0 (off). hw.usb.ehci.iaadbug This tunable enables the EHCI doorbell quirk. The default value is 0 (off). hw.usb.ehci.no_hs This tunable disables USB devices to attach like HIGH-speed ones and will force all attached devices to attach to the FULL- or LOW- speed companion controller. The default value is 0 (off). BSD
March 4, 2012 BSD
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