On Fri, 26 May 2006, Lauri Pirttiaho wrote: > When using libusb method in sanei_usb the behavior of > sanei_usb_read bulk seems to be that in responese to > NAK (errno -ETIMEDOUT, strerror saying "Resource > temporarily unavailable", which means the device > can not temporarily provide more data) > the sanei_usb_read_bulk calls usb_clear_halt > and then returns SANEI_STATUS_IO_ERROR.
certain fujitsu scanners have trouble resetting the data0/1 usb toggle properly, generally at the first command after the scanner is opened. libusb returns to sane -ETIMEDOUT, and errno is EAGAIN (Resource temporarily unavailable). the clear_halt does not help, i have tried both ways. > > Now because of the usb_clear_halt there is no longer access > to the errno so this particular reason for the IO error > can not be distinguished from others after sanei_usb_read > bulk returns. i do not understand this- errno still exists on my system, even after the clear call? are you saying that you want the negative read_size error returned? > > The solution in Avision backend seems to be that the > errors from sanei_usb_read bulk are completely ignored and > the function is called repeatedly until all data has been > read. A temporary solution but maybe not the best one. > for some scanners, perhaps the only method that works. > I would propose changing the behavior of sanei_usb_read bulk > so that in the case of NAK (resource temporarily unavailable) > the size is returned as 0 and the return value is set > either to SANE_STATUS_GOOD (read OK, just no data > at this moment) or SANE_STATUS_BUSY (device can not > respond right now). Both will work even though probably > the latter one is more in line with the meaning of USB NAK > in this case. what about all the other possible error codes that might be returned? what about using a callback mechanism like sanei_scsi does for sense data? then the backend can tell exactly what sane status it wants returned. unfortunately, i am not sure about the returns from non-libusb libs. allan > > With best regards, > > Lauri Pirttiaho > Oulu > Finland > > ................................................................... > Luukku Plus paketilla p??set eroon tila- ja turvallisuusongelmista. > Hanki Luukku Plus ja helpotat el?m??si. http://www.mtv3.fi/luukku > > > -- > sane-devel mailing list: sane-devel@lists.alioth.debian.org > http://lists.alioth.debian.org/mailman/listinfo/sane-devel > Unsubscribe: Send mail with subject "unsubscribe your_password" > to sane-devel-requ...@lists.alioth.debian.org > -- "so don't tell us it can't be done, putting down what you don't know. money isn't our god, integrity will free our souls" - Max Cavalera From azummo-li...@towertech.it Sun May 28 23:44:36 2006 From: azummo-li...@towertech.it (Alessandro Zummo) Date: Sun May 28 23:46:03 2006 Subject: [sane-devel] Re: Epson CX11 network scan support? In-Reply-To: <20060523083805.ga29...@apartia.fr> References: <20060522105248.gb28...@apartia.fr> <87hd3habf9....@geek.avasys.jp> <20060523083805.ga29...@apartia.fr> Message-ID: <20060529014436.2dbd07ed@inspiron> On Tue, 23 May 2006 10:38:05 +0200 Louis-David Mitterrand <vindex+lists-sane-de...@apartia.org> wrote: > > IIRC, Alessandro Zummo hacked up something to make scanning via TCP/IP > > work. See > > > > > > http://lists.alioth.debian.org/pipermail/sane-devel/2006-January/015986.html > > > > for details. > > Thanks, this looks promising. > > Will this work soon be integrated into sane? Hi, I've been unable to work on the driver recently. I'd say the job is half done, because comms works fine but a lot of testing needs to be made to fully support the scanner. I've posted the generic network code in this ml, but I don't think it has been included in SANE yet. This is a required step. The epson2 driver I've posted uses this code to communicate to the scanner. It would have been easier if Epson had released the specs. :) If I can find a few people that can code some bits, the driver could be completed in a decent timeframe. -- Best regards, Alessandro Zummo, Tower Technologies - Turin, Italy http://www.towertech.it
