tda9950_read
csr = tda9950_read(priv->client, REG_CSR);
cconr = tda9950_read(priv->client, REG_CCONR) & CCONR_RETRY_MASK;
csr = tda9950_read(client, REG_CSR);
cvr = tda9950_read(client, REG_CVR);