HIDIOCGFEATURE     41 include/uapi/linux/hidraw.h #define HIDIOCGFEATURE(len)    _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x07, len)
HIDIOCGFEATURE     25 samples/hidraw/hid-example.c #define HIDIOCGFEATURE(len)    _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x07, len)