WMT_N_USAGES
static const struct wmt_hid_map_item wmt_hid_map[WMT_N_USAGES] = {
struct wmt_absinfo ai[WMT_N_USAGES];
struct hid_location locs[MAX_MT_SLOTS][WMT_N_USAGES];
uint8_t caps[howmany(WMT_N_USAGES, 8)];
for ((usage) = 0; (usage) < WMT_N_USAGES; ++(usage)) \
for (i = 0; i < WMT_N_USAGES; i++) {
for (i = 0; i < WMT_N_USAGES; i++) {