Date: Tue, 14 Aug 2007 09:29:52 -0500 From: Eric Anderson <anderson@freebsd.org> To: Sven Hazejager <sven-freebsd@hazejager.nl> Cc: freebsd-hackers@freebsd.org Subject: Re: How to stop attached USB device / send IRP_MN_REMOVE_DEVICE? Message-ID: <46C1BC60.5000801@freebsd.org> In-Reply-To: <07081416114656.-1077948560@somehost.domainz.com> References: <07081411265549.-1077952816@somehost.domainz.com> <20070814030833.49a7a030@soralx> <20070814041736.4c16f41e@soralx> <07081416114656.-1077948560@somehost.domainz.com>
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Sven Hazejager wrote: >>>> So, the question really is: how to send a IRP_MN_REMOVE_DEVICE >>>> command? >>> >>> `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 device. The cmd function requires the -c argument to specify the CDB. Other arguments are optional, depending on the command type. The command and data specification syntax is documented in cam_cdbparse(3). NOTE: If the CDB specified causes data to 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 may be 6, 10, 12 or 16 bytes. -i len fmt This specifies the amount of data to read, and how it should be displayed. If the format is `-', len bytes of data will be read from the device and written to stan- dard output. -o len fmt [args] This specifies the amount of data to be written to a device, and the data that is to be written. If the format is `-', len bytes of data will be read from standard input and written to the device.
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