USB_HUB_CLEAR_TT_BUF(9) USB Core APIs USB_HUB_CLEAR_TT_BUF(9)NAME
usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
int usb_hub_clear_tt_buffer(struct urb * urb);
an URB associated with the failed or incomplete split transaction
High speed HCDs use this to tell the hub driver that some split control or bulk transaction failed in a way that requires clearing internal
state of a transaction translator. This is normally detected (and reported) from interrupt context.
It may not be possible for that hub to handle additional full (or low) speed transactions until that state is fully cleared out.
0 if successful. A negative error code otherwise.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_HUB_CLEAR_TT_BUF(9)
Check Out this Related 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
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);
pointer to the urb to initialize.
pointer to the struct usb_device for this urb.
the endpoint pipe
pointer to the transfer buffer
length of the transfer buffer
pointer to the usb_complete_t function
what to set the urb context to.
what to set the urb interval to, encoded like the endpoint descriptor's bInterval value.
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)
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