usb_fill_int_urb(9) [centos man page]

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)

USB_SG_INIT(9)							   USB Core APIs						    USB_SG_INIT(9)

NAME

       usb_sg_init - initializes scatterlist-based bulk/interrupt I/O request

SYNOPSIS

       int usb_sg_init(struct usb_sg_request * io, struct usb_device * dev, unsigned pipe, unsigned period, struct scatterlist * sg, int nents,
		       size_t length, gfp_t mem_flags);

ARGUMENTS

       io
	   request block being initialized. until usb_sg_wait returns, treat this as a pointer to an opaque block of memory,

       dev
	   the usb device that will send or receive the data

       pipe
	   endpoint "pipe" used to transfer the data

       period
	   polling rate for interrupt endpoints, in frames or (for high speed endpoints) microframes; ignored for bulk

       sg
	   scatterlist entries

       nents
	   how many entries in the scatterlist

       length
	   how many bytes to send from the scatterlist, or zero to send every byte identified in the list.

       mem_flags
	   SLAB_* flags affecting memory allocations in this call

DESCRIPTION

       Returns zero for success, else a negative errno value. This initializes a scatter/gather request, allocating resources such as I/O mappings
       and urb memory (except maybe memory used by USB controller drivers).

       The request must be issued using usb_sg_wait, which waits for the I/O to complete (or to be canceled) and then cleans up all resources
       allocated by usb_sg_init.

       The request may be canceled with usb_sg_cancel, either before or after usb_sg_wait is called.

COPYRIGHT

Kernel Hackers Manual 2.6.					     July 2010							    USB_SG_INIT(9)