Hello, [I'm Debian libgphoto2 maintainer]
Marco d'Itri wrote:
> > In order to summarize libgphoto2 udev rules now looks like
> >
> > ACTION!="add", GOTO="libgphoto2_rules_end"
> >
> > # then lots of lines like this one (cr added for legibility):
> > SUBSYSTEM=="usb_device", SYSFS{idVendor}=="0553",
> > SYSFS{idProduct}=="0202", MODE="0660", GROUP="camera"
> >
> > # with also a generic rule for PTP cameras:
> > SYSFS{bInterfaceClass}=="06", SYSFS{bInterfaceSubClass}=="01",
> > SYSFS{bInterfaceProtocol}=="01", MODE="0660", GROUP="camera"
> This is a not specific enough rule (it should probably match on
> SUBSYSTEM=="usb_device", you can check using
> udevinfo -a -p /sys/class/usb_device/...), but I am not sure if it can
> cause the rule to not match.
I can't find info about how to get access to "interface level"
variables from udev; for example on this camera, shortened lsusb
output:
Bus 001 Device 014: ID 04a9:3073 Canon, Inc. PowerShot A70 (ptp)
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
[...]
Configuration Descriptor:
[...]
Interface Descriptor:
[...]
bInterfaceClass 6 Imaging
bInterfaceSubClass 1 Still Image Capture
bInterfaceProtocol 1 Picture Transfer Protocol (PIMA 15470)
[...]
I'd like to write a rule to match on this bInterfaceClass, so it would
match on future PTP devices, without any need to add their idVendor /
idProduc; is this possible ? How so ?
Thanks,
Frederic
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