HIDIOCSFEATURE     40 include/uapi/linux/hidraw.h #define HIDIOCSFEATURE(len)    _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x06, len)
HIDIOCSFEATURE     24 samples/hidraw/hid-example.c #define HIDIOCSFEATURE(len)    _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x06, len)