wsmux_device
#define WSMUXIO_ADD_DEVICE _IOW('W', 97, struct wsmux_device)
#define WSMUXIO_REMOVE_DEVICE _IOW('W', 98, struct wsmux_device)
struct wsmux_device devices[WSMUX_MAXDEV];
#define d ((struct wsmux_device *)data)
#define d ((struct wsmux_device *)data)
struct wsmux_device wmd;