Hi
I am attempting to implement a library that can be linked into
applications wishing to exchange reports with HIDs (specifically UPSs)
over the USB.
So far, it looks like I can identify the particular device on the USB
by parsing /proc/bus/usb/devices (which seems like a pretty weak approach,
as it requires polling of the file), and then open up a channel to the
device by invoking open("/proc/bus/usb/<bus#>/<device#") as seen in
libusb courtesy of Johannes Erdfeldt. Control messages are then
sent/received by invoking ioctl() on the resulting file handle.
Is this a sound approach? The preferred method, from what I can
gather, seems to be using URB-oriented functions and macros in
linux/usb.h. The examples I have found, which are all driver modules,
do not show how to initialize the usb_device structure - I guess they
are set up by usbcore and received by the driver via the probe()
callback. Do I have to register myself as a driver, then, or is there
some other way to initialize a usb_device?
Many thanks for any insight you can provide.
cheers,
ph
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