i2c_prop_info_perm
switch (i2c_prop_info_perm(arg->icpg_info)) {
if (i2c_prop_info_perm(info) != I2C_PROP_PERM_RW) {
extern i2c_prop_perm_t i2c_prop_info_perm(i2c_prop_info_t *);