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List: libusb-devel
Subject: Re: [libusb] Detecting WinUSB.SYS
From: "Butch Griffin" <butchg () comcast ! net>
Date: 2016-11-15 2:59:26
Message-ID: 008f01d23eec$477c5420$d674fc60$ () comcast ! net
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Thanks for the various feedback and for others benefit …
I found that if I have my proprietary driver attached, the open fails if it is a \
simple device. But, if it is a composite device, the open succeeds and I must try to \
claim an interface other than interface zero that I know exists. This makes sense of \
source in hingsight.
If I have the WinUSB.sys driver attached all of this works as expected and I can use \
libusb.
Fairly simple logic to get it working, but someone else may come up against the same \
thing.
Thanks
Jack
From: elavid@gmail.com [mailto:elavid@gmail.com] On Behalf Of David Grayson
Sent: Thursday, November 10, 2016 11:54 AM
To: Butch Griffin <butchg@comcast.net>
Cc: Libusb Mailing List <libusb-devel@lists.sourceforge.net>
Subject: Re: [libusb] Detecting WinUSB.SYS
Hello, Jack.
There is code for doing that in libusbp, in a function named \
check_driver_installation:
https://github.com/pololu/libusbp/blob/890379c54ef58de46afc60b9c3eccfe2bd66d523/src/windows/generic_interface_windows.c
I hope you find it useful!
--David
On Thu, Nov 10, 2016 at 10:45 AM, Butch Griffin <butchg@comcast.net \
<mailto:butchg@comcast.net> > wrote:
Hello,
I have an application that scans for USB devices that match any one of a set of \
VID/PID pairs that are managed by the application. After detecting the device, I \
want to determine if the device is bound to WinUSB.SYS and if so, I will manage the \
device using the libusb APIs. However, the device may also be bound to another \
proprietary driver and if it is I want to ignore the device.
When I find a device that is bound to the other driver, it turns out I can open the \
device, perform control transfers for standard descriptors, etc. and it all works. \
None of my requests fail until I do a BULK request of some type to the device. Then, \
if the device is not bound to WinUSB.SYS, the request will fail. While I could use \
this to determine if I am talking to a device I can manage, the bulk requests have \
side effects and I don't want to happen.
So, the basic question, is there a way when using libusb under windows to determine \
if a given device is bound to WinUSB.sys (or I guess any other driver that has a \
backend under windows)?
Thanks
Jack
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class=WordSection1><p class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Thanks for the various \
feedback and for others benefit …<o:p></o:p></span></p><p class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p \
class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>I \
found that if I have my proprietary driver attached, the open fails if it is a simple \
device. But, if it is a composite device, the open succeeds and I must try to claim \
an interface other than interface zero that I know exists. This makes sense of \
source in hingsight. <o:p></o:p></span></p><p class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p \
class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>If I \
have the WinUSB.sys driver attached all of this works as expected and I can use \
libusb.<o:p></o:p></span></p><p class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p \
class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Fairly simple logic to get \
it working, but someone else may come up against the same \
thing.<o:p></o:p></span></p><p class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p \
class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Thanks<o:p></o:p></span></p><p \
class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Jack<o:p></o:p></span></p><p \
class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p \
class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p \
class=MsoNormal><b><span \
style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span \
style='font-size:11.0pt;font-family:"Calibri",sans-serif'> elavid@gmail.com \
[mailto:elavid@gmail.com] <b>On Behalf Of </b>David Grayson<br><b>Sent:</b> Thursday, \
November 10, 2016 11:54 AM<br><b>To:</b> Butch Griffin \
<butchg@comcast.net><br><b>Cc:</b> Libusb Mailing List \
<libusb-devel@lists.sourceforge.net><br><b>Subject:</b> Re: [libusb] Detecting \
WinUSB.SYS<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p \
class=MsoNormal>Hello, Jack.<o:p></o:p></p><div><p \
class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>There is code for \
doing that in libusbp, in a function named \
check_driver_installation:<o:p></o:p></p></div><div><p class=MsoNormal><br><a \
href="https://github.com/pololu/libusbp/blob/890379c54ef58de46afc60b9c3eccfe2bd66d523/ \
src/windows/generic_interface_windows.c">https://github.com/pololu/libusbp/blob/890379 \
c54ef58de46afc60b9c3eccfe2bd66d523/src/windows/generic_interface_windows.c</a><br><br>I \
hope you find it useful!<o:p></o:p></p></div><div><p \
class=MsoNormal><o:p> </o:p></p></div><div><p \
class=MsoNormal>--David<o:p></o:p></p></div></div><div><p \
class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On Thu, Nov 10, 2016 at \
10:45 AM, Butch Griffin <<a href="mailto:butchg@comcast.net" \
target="_blank">butchg@comcast.net</a>> wrote:<o:p></o:p></p><blockquote \
style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in \
6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Hello,<o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I have an \
application that scans for USB devices that match any one of a set of VID/PID pairs \
that are managed by the application. After detecting the device, I want to \
determine if the device is bound to WinUSB.SYS and if so, I will manage the device \
using the libusb APIs. However, the device may also be bound to another \
proprietary driver and if it is I want to ignore the device. <o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>When I \
find a device that is bound to the other driver, it turns out I can open the device, \
perform control transfers for standard descriptors, etc. and it all works. None \
of my requests fail until I do a BULK request of some type to the device. Then, \
if the device is not bound to WinUSB.SYS, the request will fail. While I could \
use this to determine if I am talking to a device I can manage, the bulk requests \
have side effects and I don't want to happen.<o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>So, the \
basic question, is there a way when using libusb under windows to determine if a \
given device is bound to WinUSB.sys (or I guess any other driver that has a backend \
under windows)?<o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Thanks<o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Jack<o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div></div><p \
class=MsoNormal style='margin-bottom:12.0pt'><br>------------------------------------------------------------------------------<br>Developer \
Access Program for Intel Xeon Phi Processors<br>Access to Intel Xeon Phi \
processor-based developer platforms.<br>With one year of Intel Parallel Studio \
XE.<br>Training and support from Colfax.<br>Order your platform today. <a \
href="http://sdm.link/xeonphi" \
target="_blank">http://sdm.link/xeonphi</a><br>_______________________________________________<br>libusb-devel \
mailing list<br><a href="mailto:libusb-devel@lists.sourceforge.net">libusb-devel@lists.sourceforge.net</a><br><a \
href="https://lists.sourceforge.net/lists/listinfo/libusb-devel" \
target="_blank">https://lists.sourceforge.net/lists/listinfo/libusb-devel</a><o:p></o:p></p></blockquote></div><p \
class=MsoNormal><o:p> </o:p></p></div></div></body></html>
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