Messages in this thread | | | Date | Sat, 01 Nov 2008 21:44:51 +1000 | From | Adam Nielsen <> | Subject | Can you use the USB HID interface within a driver? |
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Hi all,
I'm about to start writing a driver for a Gigabyte Odin PC power supply. This device has a USB connection which allows you to monitor temperature, voltages, current, etc.
Before I start coding the USB side of things, I'd just like some advice as to the best way of communicating with the device.
I would rather write the driver in kernel space (so that it "just works" and provides a hwmon interface without installing extra software), however the device already appears to the system as a USB HID device, and so gets claimed by the existing usbhid driver.
Is there any way to interface with the HID driver from within another driver? Or will I have to claim the device first (or disconnect usbhid), and communicate with it myself?
I've tried to find some example code from a driver that already does this (such as a USB keyboard driver) but I'm having some trouble finding one! The closest drivers I can find are all the ones in drivers/hid/usbhid, but they all seem to be "embedded" in hid-core.c. Does that mean I need to modify hid-core.c to call my driver?
Or perhaps someone could point me in the direction of a USB HID driver that does things "properly" already?
Many thanks, Adam.
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