ETP_I2C_INF_LENGTH
retval = elan_i2c_read_block(client, reg, val, ETP_I2C_INF_LENGTH);
error = i2c_master_recv(client, val, ETP_I2C_INF_LENGTH);
len = i2c_master_recv(client, buffer, ETP_I2C_INF_LENGTH);
if (len != ETP_I2C_INF_LENGTH) {