USB_EP_FIFO_STATUS - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Kernel Mode Gadget API

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NAMEusb_ep_fifo_status − returns number of bytes in fifo, or error

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SYNOPSISint usb_ep_fifo_status(struct usb_ep * ep);

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ARGUMENTSep the endpoint whose fifo status is being checked​.

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DESCRIPTIONFIFO endpoints may have ‟unclaimed data” in them in certain cases, such as after aborted transfers​. Hosts may not have collected all the IN data written by the gadget driver (and reported by a request completion)​. The gadget driver may not have collected all the data written OUT to it by the host​. Drivers that need precise handling for fault reporting or recovery may need to use this call​. This returns the number of such bytes in the fifo, or a negative errno if the endpoint doesn´t use a FIFO or doesn´t support such precise handling​.

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AUTHORDavid Brownell <​dbrownell@users.sourceforge.net​> Author.

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