166 lines
5.9 KiB
Plaintext
166 lines
5.9 KiB
Plaintext
Revised: 2004-Oct-21
|
|
|
|
This is the documentation of (hopefully) all possible error codes (and
|
|
their interpretation) that can be returned from usbcore.
|
|
|
|
Some of them are returned by the Host Controller Drivers (HCDs), which
|
|
device drivers only see through usbcore. As a rule, all the HCDs should
|
|
behave the same except for transfer speed dependent behaviors and the
|
|
way certain faults are reported.
|
|
|
|
|
|
**************************************************************************
|
|
* Error codes returned by usb_submit_urb *
|
|
**************************************************************************
|
|
|
|
Non-USB-specific:
|
|
|
|
0 URB submission went fine
|
|
|
|
-ENOMEM no memory for allocation of internal structures
|
|
|
|
USB-specific:
|
|
|
|
-ENODEV specified USB-device or bus doesn't exist
|
|
|
|
-ENOENT specified interface or endpoint does not exist or
|
|
is not enabled
|
|
|
|
-ENXIO host controller driver does not support queuing of this type
|
|
of urb. (treat as a host controller bug.)
|
|
|
|
-EINVAL a) Invalid transfer type specified (or not supported)
|
|
b) Invalid or unsupported periodic transfer interval
|
|
c) ISO: attempted to change transfer interval
|
|
d) ISO: number_of_packets is < 0
|
|
e) various other cases
|
|
|
|
-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 Host controller driver can't schedule that many ISO frames.
|
|
|
|
-EPIPE Specified endpoint is stalled. For non-control endpoints,
|
|
reset this status with usb_clear_halt().
|
|
|
|
-EMSGSIZE (a) endpoint maxpacket size is zero; it is not usable
|
|
in the current interface altsetting.
|
|
(b) ISO packet is larger than the endpoint maxpacket.
|
|
(c) requested data transfer length is invalid: negative
|
|
or too large for the host controller.
|
|
|
|
-ENOSPC This request would overcommit the usb bandwidth reserved
|
|
for periodic transfers (interrupt, isochronous).
|
|
|
|
-ESHUTDOWN The device or host controller has been disabled due to some
|
|
problem that could not be worked around.
|
|
|
|
-EPERM Submission failed because urb->reject was set.
|
|
|
|
-EHOSTUNREACH URB was rejected because the device is suspended.
|
|
|
|
|
|
**************************************************************************
|
|
* Error codes returned by in urb->status *
|
|
* or in iso_frame_desc[n].status (for ISO) *
|
|
**************************************************************************
|
|
|
|
USB device drivers may only test urb status values in completion handlers.
|
|
This is because otherwise there would be a race between HCDs updating
|
|
these values on one CPU, and device drivers testing them on another CPU.
|
|
|
|
A transfer's actual_length may be positive even when an error has been
|
|
reported. That's because transfers often involve several packets, so that
|
|
one or more packets could finish before an error stops further endpoint I/O.
|
|
|
|
|
|
0 Transfer completed successfully
|
|
|
|
-ENOENT URB was synchronously unlinked by usb_unlink_urb
|
|
|
|
-EINPROGRESS URB still pending, no results yet
|
|
(That is, if drivers see this it's a bug.)
|
|
|
|
-EPROTO (*, **) a) bitstuff error
|
|
b) no response packet received within the
|
|
prescribed bus turn-around time
|
|
c) unknown USB error
|
|
|
|
-EILSEQ (*, **) a) CRC mismatch
|
|
b) no response packet received within the
|
|
prescribed bus turn-around time
|
|
c) unknown USB error
|
|
|
|
Note that often the controller hardware does not
|
|
distinguish among cases a), b), and c), so a
|
|
driver cannot tell whether there was a protocol
|
|
error, a failure to respond (often caused by
|
|
device disconnect), or some other fault.
|
|
|
|
-ETIME (**) No response packet received within the prescribed
|
|
bus turn-around time. This error may instead be
|
|
reported as -EPROTO or -EILSEQ.
|
|
|
|
-ETIMEDOUT Synchronous USB message functions use this code
|
|
to indicate timeout expired before the transfer
|
|
completed, and no other error was reported by HC.
|
|
|
|
-EPIPE (**) Endpoint stalled. For non-control endpoints,
|
|
reset this status with usb_clear_halt().
|
|
|
|
-ECOMM During an IN transfer, the host controller
|
|
received data from an endpoint faster than it
|
|
could be written to system memory
|
|
|
|
-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
|
|
|
|
-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. "Babble".
|
|
|
|
-EREMOTEIO The data read from the endpoint did not fill the
|
|
specified buffer, and URB_SHORT_NOT_OK was set in
|
|
urb->transfer_flags.
|
|
|
|
-ENODEV Device was removed. Often preceded by a burst of
|
|
other errors, since the hub driver doesn't detect
|
|
device removal events immediately.
|
|
|
|
-EXDEV ISO transfer only partially completed
|
|
look at individual frame status for details
|
|
|
|
-EINVAL ISO madness, if this happens: Log off and go home
|
|
|
|
-ECONNRESET URB was asynchronously unlinked by usb_unlink_urb
|
|
|
|
-ESHUTDOWN The device or host controller has been disabled due
|
|
to some problem that could not be worked around,
|
|
such as a physical disconnect.
|
|
|
|
|
|
(*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
|
|
hardware problems such as bad devices (including firmware) or cables.
|
|
|
|
(**) This is also one of several codes that different kinds of host
|
|
controller use to indicate a transfer has failed because of device
|
|
disconnect. In the interval before the hub driver starts disconnect
|
|
processing, devices may receive such fault reports for every request.
|
|
|
|
|
|
|
|
**************************************************************************
|
|
* 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_*():
|
|
usb_control_msg():
|
|
usb_bulk_msg():
|
|
-ETIMEDOUT Timeout expired before the transfer completed.
|