usb_gadget_config_buf(9) [centos man page]

USB_GADGET_CONFIG_BU(9) 				      Kernel Mode Gadget API					   USB_GADGET_CONFIG_BU(9)

NAME

       usb_gadget_config_buf - builts a complete configuration descriptor

SYNOPSIS

       int usb_gadget_config_buf(const struct usb_config_descriptor * config, void * buf, unsigned length,
				 const struct usb_descriptor_header ** desc);

ARGUMENTS

       config
	   Header for the descriptor, including characteristics such as power requirements and number of interfaces.

       buf
	   Buffer for the resulting configuration descriptor.

       length
	   Length of buffer. If this is not big enough to hold the entire configuration descriptor, an error code will be returned.

       desc
	   Null-terminated vector of pointers to the descriptors (interface, endpoint, etc) defining all functions in this device configuration.

DESCRIPTION

       This copies descriptors into the response buffer, building a descriptor for that configuration. It returns the buffer length or a negative
       status code. The config.wTotalLength field is set to match the length of the result, but other descriptor fields (including power usage and
       interface count) must be set by the caller.

       Gadget drivers could use this when constructing a config descriptor in response to USB_REQ_GET_DESCRIPTOR. They will need to patch the
       resulting bDescriptorType value if USB_DT_OTHER_SPEED_CONFIG is needed.

AUTHOR

       David Brownell <dbrownell@users.sourceforge.net>
	   Author.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						   USB_GADGET_CONFIG_BU(9)

STRUCT 
USB_EP(9)					      Kernel Mode Gadget API						  STRUCT USB_EP(9)

NAME

       struct_usb_ep - device side representation of USB endpoint

SYNOPSIS

       struct usb_ep {
	 void * driver_data;
	 const char * name;
	 const struct usb_ep_ops * ops;
	 struct list_head ep_list;
	 unsigned maxpacket:16;
	 unsigned max_streams:16;
	 unsigned mult:2;
	 unsigned maxburst:5;
	 u8 address;
	 const struct usb_endpoint_descriptor * desc;
	 const struct usb_ss_ep_comp_descriptor * comp_desc;
       };

MEMBERS

       driver_data
	   for use by the gadget driver.

       name
	   identifier for the endpoint, such as "ep-a" or "ep9in-bulk"

       ops
	   Function pointers used to access hardware-specific operations.

       ep_list
	   the gadget's ep_list holds all of its endpoints

       maxpacket
	   The maximum packet size used on this endpoint. The initial value can sometimes be reduced (hardware allowing), according to the
	   endpoint descriptor used to configure the endpoint.

       max_streams
	   The maximum number of streams supported by this EP (0 - 16, actual number is 2^n)

       mult
	   multiplier, 'mult' value for SS Isoc EPs

       maxburst
	   the maximum number of bursts supported by this EP (for usb3)

       address
	   used to identify the endpoint when finding descriptor that matches connection speed

       desc
	   endpoint descriptor. This pointer is set before the endpoint is enabled and remains valid until the endpoint is disabled.

       comp_desc
	   In case of SuperSpeed support, this is the endpoint companion descriptor that is used to configure the endpoint

DESCRIPTION

       the bus controller driver lists all the general purpose endpoints in gadget->ep_list. the control endpoint (gadget->ep0) is not in that
       list, and is accessed only in response to a driver setup callback.

AUTHOR

       David Brownell <dbrownell@users.sourceforge.net>
	   Author.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014							  STRUCT USB_EP(9)