PMBUS_SMBALERT_MASK
if (reg != PMBUS_SMBALERT_MASK)
ret = pmbus_read_word_data(client, 0, 0, PMBUS_SMBALERT_MASK);
return pmbus_write_word_data(client, 0, PMBUS_SMBALERT_MASK, ret);
ret = _pmbus_write_word_data(client, page, PMBUS_SMBALERT_MASK, reg | (val << 8));