How to stop attached USB device / send IRP_MN_REMOVE_DEVICE?
anderson at freebsd.org
Tue Aug 14 07:30:00 PDT 2007
Sven Hazejager wrote:
>>>> So, the question really is: how to send a IRP_MN_REMOVE_DEVICE
>>> `camcontrol da? stop` seemed to do the trick before (5.2.1-R, AFAIR),
>>> but now I'm not sure (looks like it doesn't)
>> sorry, I meant to say that `camcontrol da? stop` does not power down
>> the device anymore; nonetheless, it is probably safe to disconnect it
> No, camcontrol does not support this over USB. Windows XP demonstrates
> it is technically possible, and I do not believe it is fully safe to
> disconnect the drive (even when unmounted), as the drive then is not
> able to park its heads, which it DOES do under XP.
> So, we come back to the original question: how to send an
> IRP_MN_REMOVE_DEVICE event?
Maybe this helps?
man camcontrol ? :
cmd Allows the user to send an arbitrary SCSI CDB to any
The cmd function requires the -c argument to specify
Other arguments are optional, depending on the command
The command and data specification syntax is documented in
cam_cdbparse(3). NOTE: If the CDB specified causes
be transfered to or from the SCSI device in question, you
MUST specify either -i or -o.
-c cmd [args] This specifies the SCSI CDB. CDBs
6, 10, 12 or 16 bytes.
-i len fmt This specifies the amount of data
and how it should be displayed. If the
format is `-', len bytes of data
read from the device and written to
-o len fmt [args] This specifies the amount of data to be
written to a device, and the data
to be written. If the format is
bytes of data will be read from
input and written to the device.
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