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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