struct_usb_host_endpoint(9) [centos man page]

STRUCT 
USB_HOST_ENDP(9) 				  Host-Side Data Types and Macro				   STRUCT USB_HOST_ENDP(9)

NAME

       struct_usb_host_endpoint - host-side endpoint descriptor and queue

SYNOPSIS

       struct usb_host_endpoint {
	 struct usb_endpoint_descriptor desc;
	 struct usb_ss_ep_comp_descriptor ss_ep_comp;
	 struct list_head urb_list;
	 void * hcpriv;
	 struct ep_device * ep_dev;
	 unsigned char * extra;
	 int extralen;
	 int enabled;
       };

MEMBERS

       desc
	   descriptor for this endpoint, wMaxPacketSize in native byteorder

       ss_ep_comp
	   SuperSpeed companion descriptor for this endpoint

       urb_list
	   urbs queued to this endpoint; maintained by usbcore

       hcpriv
	   for use by HCD; typically holds hardware dma queue head (QH) with one or more transfer descriptors (TDs) per urb

       ep_dev
	   ep_device for sysfs info

       extra
	   descriptors following this endpoint in the configuration

       extralen
	   how many bytes of "extra" are valid

       enabled
	   URBs may be submitted to this endpoint

DESCRIPTION

       USB requests are always queued to a given endpoint, identified by a descriptor within an active interface in a given USB configuration.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						   STRUCT USB_HOST_ENDP(9)

USB_FILL_INT_URB(9)					  Host-Side Data Types and Macro				       USB_FILL_INT_URB(9)

NAME

       usb_fill_int_urb - macro to help initialize a interrupt urb

SYNOPSIS

       void usb_fill_int_urb(struct urb * urb, struct usb_device * dev, unsigned int pipe, void * transfer_buffer, int buffer_length,
			     usb_complete_t complete_fn, void * context, int interval);

ARGUMENTS

       urb
	   pointer to the urb to initialize.

       dev
	   pointer to the struct usb_device for this urb.

       pipe
	   the endpoint pipe

       transfer_buffer
	   pointer to the transfer buffer

       buffer_length
	   length of the transfer buffer

       complete_fn
	   pointer to the usb_complete_t function

       context
	   what to set the urb context to.

       interval
	   what to set the urb interval to, encoded like the endpoint descriptor's bInterval value.

DESCRIPTION

       Initializes a interrupt urb with the proper information needed to submit it to a device.

       Note that High Speed and SuperSpeed interrupt endpoints use a logarithmic encoding of the endpoint interval, and express polling intervals
       in microframes (eight per millisecond) rather than in frames (one per millisecond).

       Wireless USB also uses the logarithmic encoding, but specifies it in units of 128us instead of 125us. For Wireless USB devices, the
       interval is passed through to the host controller, rather than being translated into microframe units.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						       USB_FILL_INT_URB(9)