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Revised: 2000-Dec-05.
This is the documentation of (hopefully) all possible error codes (and
their interpretation) that can be returned from the host controller drivers
and from usbcore.
NOTE:
The USB_ST_* codes are deprecated and are only listed for compatibility;
new software should use only -E* instead!
**************************************************************************
* Error codes returned by usb_submit_urb *
**************************************************************************
Non-USB-specific:
USB_ST_NOERROR
0 URB submission went fine
-ENOMEM no memory for allocation of internal structures
USB-specific:
-ENODEV specified USB-device or bus doesn't exist
USB_ST_REQUEST_ERROR
-ENXIO a control or interrupt URB is already queued to this endpoint; or
a bulk URB is already queued to this endpoint and
USB_QUEUE_BULK wasn't used (UHCI HCDs only)
USB_ST_URB_INVALID_ERROR
-EINVAL a) Invalid transfer type specified (or not supported)
b) Invalid interrupt interval (0<=n<256)
c) more than one interrupt packet requested
d) ISO: number_of_packets is < 0
-EAGAIN a) specified ISO start frame too early
b) (using ISO-ASAP) too much scheduled for the future
wait some time and try again.
-EFBIG too much ISO frames requested (currently uhci>900)
USB_ST_STALL
-EPIPE specified pipe-handle is already stalled
-EMSGSIZE endpoint message size is zero, do interface/alternate setting
USB_ST_BANDWIDTH_ERROR
-ENOSPC The host controller's bandwidth is already consumed and
this request would push it past its allowed limit.
-ESHUTDOWN The host controller has been disabled due to some
problem that could not be worked around.
**************************************************************************
* Error codes returned by in urb->status *
* or in iso_frame_desc[n].status (for ISO) *
**************************************************************************
USB_ST_NOERROR
0 Transfer completed successfully
USB_ST_URB_KILLED
-ENOENT URB was canceled by usb_unlink_urb
USB_ST_URB_PENDING
-EINPROGRESS URB still pending, no results yet
(actually no error until now;-)
USB_ST_BITSTUFF
USB_ST_INTERNALERROR
-EPROTO a) bitstuff error
b) unknown USB error
USB_ST_CRC
-EILSEQ CRC mismatch
USB_ST_STALL
-EPIPE a) babble detect
b) endpoint stalled
USB_ST_BUFFEROVERRUN
-ECOMM During an IN transfer, the host controller
received data from an endpoint faster than it
could be written to system memory
USB_ST_BUFFERUNDERRUN
-ENOSR During an OUT transfer, the host controller
could not retrieve data from system memory fast
enough to keep up with the USB data rate
USB_ST_DATAOVERRUN
-EOVERFLOW The amount of data returned by the endpoint was
greater than either the max packet size of the
endpoint or the remaining buffer size
USB_ST_DATAUNDERRUN
-EREMOTEIO The endpoint returned less than max packet size
and that amount did not fill the specified buffer
USB_ST_NORESPONSE
USB_ST_TIMEOUT
-ETIMEDOUT transfer timed out, NAK
USB_ST_REMOVED
-ENODEV device was removed
USB_ST_SHORT_PACKET
-EREMOTEIO short packet detected
USB_ST_PARTIAL_ERROR
-EXDEV ISO transfer only partially completed
look at individual frame status for details
USB_ST_URB_INVALID_ERROR
-EINVAL ISO madness, if this happens: Log off and go home
-ECONNRESET the URB is being unlinked asynchronously
**************************************************************************
* Error codes returned by usbcore-functions *
* (expect also other submit and transfer status codes) *
**************************************************************************
usb_register():
-EINVAL error during registering new driver
usb_get_*/usb_set_*():
All USB errors (submit/status) can occur
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