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$Id: README.error-codes,v 1.1 1999/12/14 14:03:02 fliegl Exp $
This is the documentation of (hopefully) all possible error codes (and
their interpretation) that can be returned from the hostcontroller driver
and from usbcore.
NOTE:
The USB_ST_* codes are deferred 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
-ENXIO specified endpoint doesn't exist on the device
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
-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)
-EPIPE specified pipe-handle is already stalled
-EMSGSIZE endpoint message size is zero, do interface/alternate setting
**************************************************************************
* 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 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
-EPIPE a) babble detect
b) endpoint stalled
USB_ST_BUFFERUNDERRUN
-ENOST buffer error
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
**************************************************************************
* Error codes returned by usbcore-functions *
* (expect also other submit and transfer status codes) *
**************************************************************************
usb_register():
USB_ST_NOTSUPPORTED
-EINVAL error during registering new driver
usb_terminate_bulk():
USB_ST_REMOVED
-ENODEV urb already removed
usb_get_*/usb_set_*():
All USB errors (submit/status) can occur
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