i2c_m_recv_len
if (idev->msg_xfrd_r == 0 && i2c_m_recv_len(msg)) {
u32 rlen = i2c_m_recv_len(&msgs[1]) ? I2C_SMBUS_BLOCK_MAX : msgs[1].len;
rx_xfer = i2c_m_recv_len(msg) ? I2C_SMBUS_BLOCK_MAX : msg->len;