drivers/usb/core/driver.c:

#ifdef  CONFIG_USB_DEVICEFS
        /* If this is available, userspace programs can directly read
         * all the device descriptors we don't tell them about.  Or
         * act as usermode drivers.
         */
        if (add_uevent_var(env, "DEVICE=/proc/bus/usb/%03d/%03d",
                           usb_dev->bus->busnum, usb_dev->devnum))
                return -ENOMEM;
#endif

Evidently $DEVICE is specific to usbfs.

-- 
still uses /proc/bus/usb for $DEVICE
https://bugs.launchpad.net/bugs/311481
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