[media] tda18212: add support for slave chip version

There is 2 different versions of that chip available, master and
slave. Slave is used only on dual tuner devices with master tuner.
Laser printing top of chip is 18212/M or 18212/S according to chip
version.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/tuners/tda18212.c

@@ -306,7 +306,8 @@ struct dvb_frontend *tda18212_attach(struct dvb_frontend *fe,
 {
 	struct tda18212_priv *priv = NULL;
 	int ret;
-	u8 val;
+	u8 chip_id = chip_id;
+	char *version;
 
 	priv = kzalloc(sizeof(struct tda18212_priv), GFP_KERNEL);
 	if (priv == NULL)
@@ -320,26 +321,38 @@ struct dvb_frontend *tda18212_attach(struct dvb_frontend *fe,
 		fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 
 	/* check if the tuner is there */
-	ret = tda18212_rd_reg(priv, 0x00, &val);
+	ret = tda18212_rd_reg(priv, 0x00, &chip_id);
+	dev_dbg(&priv->i2c->dev, "%s: chip_id=%02x\n", __func__, chip_id);
 
 	if (fe->ops.i2c_gate_ctrl)
 		fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 
-	if (!ret)
-		dev_dbg(&priv->i2c->dev, "%s: chip id=%02x\n", __func__, val);
-	if (ret || val != 0xc7) {
-		kfree(priv);
-		return NULL;
+	if (ret)
+		goto err;
+
+	switch (chip_id) {
+	case 0xc7:
+		version = "M"; /* master */
+		break;
+	case 0x47:
+		version = "S"; /* slave */
+		break;
+	default:
+		goto err;
 	}
 
 	dev_info(&priv->i2c->dev,
-			"%s: NXP TDA18212HN successfully identified\n",
-			KBUILD_MODNAME);
+			"%s: NXP TDA18212HN/%s successfully identified\n",
+			KBUILD_MODNAME, version);
 
 	memcpy(&fe->ops.tuner_ops, &tda18212_tuner_ops,
 		sizeof(struct dvb_tuner_ops));
 
 	return fe;
+err:
+	dev_dbg(&i2c->dev, "%s: failed=%d\n", __func__, ret);
+	kfree(priv);
+	return NULL;
 }
 EXPORT_SYMBOL(tda18212_attach);