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usb_speed_string(9) [centos man page]

USB_SPEED_STRING(9)					      Kernel Mode Gadget API					       USB_SPEED_STRING(9)

NAME
usb_speed_string - Returns human readable-name of the speed. SYNOPSIS
const char * usb_speed_string(enum usb_device_speed speed); ARGUMENTS
speed The speed to return human-readable name for. If it's not any of the speeds defined in usb_device_speed enum, string for USB_SPEED_UNKNOWN will be returned. AUTHOR
David Brownell <dbrownell@users.sourceforge.net> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 USB_SPEED_STRING(9)

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STRUCT 
USB_GADGET(9) Kernel Mode Gadget API STRUCT USB_GADGET(9) NAME
struct_usb_gadget - represents a usb slave device SYNOPSIS
struct usb_gadget { const struct usb_gadget_ops * ops; struct usb_ep * ep0; struct list_head ep_list; enum usb_device_speed speed; unsigned is_dualspeed:1; unsigned is_otg:1; unsigned is_a_peripheral:1; unsigned b_hnp_enable:1; unsigned a_hnp_support:1; unsigned a_alt_hnp_support:1; const char * name; struct device dev; }; MEMBERS
ops Function pointers used to access hardware-specific operations. ep0 Endpoint zero, used when reading or writing responses to driver setup requests ep_list List of other endpoints supported by the device. speed Speed of current connection to USB host. is_dualspeed True if the controller supports both high and full speed operation. If it does, the gadget driver must also support both. is_otg True if the USB device port uses a Mini-AB jack, so that the gadget driver must provide a USB OTG descriptor. is_a_peripheral False unless is_otg, the "A" end of a USB cable is in the Mini-AB jack, and HNP has been used to switch roles so that the "A" device currently acts as A-Peripheral, not A-Host. b_hnp_enable OTG device feature flag, indicating that the A-Host enabled HNP support. a_hnp_support OTG device feature flag, indicating that the A-Host supports HNP at this port. a_alt_hnp_support OTG device feature flag, indicating that the A-Host only supports HNP on a different root port. name Identifies the controller hardware type. Used in diagnostics and sometimes configuration. dev Driver model state for this abstract device. DESCRIPTION
Gadgets have a mostly-portable "gadget driver" implementing device functions, handling all usb configurations and interfaces. Gadget drivers talk to hardware-specific code indirectly, through ops vectors. That insulates the gadget driver from hardware details, and packages the hardware endpoints through generic i/o queues. The "usb_gadget" and "usb_ep" interfaces provide that insulation from the hardware. Except for the driver data, all fields in this structure are read-only to the gadget driver. That driver data is part of the "driver model" infrastructure in 2.6 (and later) kernels, and for earlier systems is grouped in a similar structure that's not known to the rest of the kernel. Values of the three OTG device feature flags are updated before the setup call corresponding to USB_REQ_SET_CONFIGURATION, and before driver suspend calls. They are valid only when is_otg, and when the device is acting as a B-Peripheral (so is_a_peripheral is false). AUTHOR
David Brownell <dbrownell@users.sourceforge.net> Author. COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 STRUCT USB_GADGET(9)
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