OK, hopefully my last couple of questions:
1. From the kernel, what's the best way to enumerate the devices that are
already plugged in?
2. I can use filp_open to open the devices in USBFS, this gives me a struct
file, from which I can get the struct file_operations, from which I can get
a pointer to the IOCTL function for that device. I can cast that as a
function pointer, and call it, but I believe that it's expecting the last
parameter to be a pointer to a buffer in userspace. Is there a correct
way to handle this?
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