media: ngene: deduplicate I2C adapter evaluation

The I2C adapter evaluation (based on chan->number) is duplicated at
several places (tuner_attach_() functions, demod_attach_stv0900() and
cineS2_probe()). Clean this up by wrapping that construct in a separate
function which all users of that can pass the ngene_channel pointer and
get the correct I2C adapter from.
Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/pci/ngene/ngene-cards.c

@@ -118,17 +118,25 @@ static int i2c_read_reg(struct i2c_adapter *adapter, u8 adr, u8 reg, u8 *val)
 /* Demod/tuner attachment ***************************************************/
 /****************************************************************************/
 
+static struct i2c_adapter *i2c_adapter_from_chan(struct ngene_channel *chan)
+{
+	/* tuner 1+2: i2c adapter #0, tuner 3+4: i2c adapter #1 */
+	if (chan->number < 2)
+		return &chan->dev->channel[0].i2c_adapter;
+
+	return &chan->dev->channel[1].i2c_adapter;
+}
+
 static int tuner_attach_stv6110(struct ngene_channel *chan)
 {
 	struct device *pdev = &chan->dev->pci_dev->dev;
-	struct i2c_adapter *i2c;
+	struct i2c_adapter *i2c = i2c_adapter_from_chan(chan);
 	struct stv090x_config *feconf = (struct stv090x_config *)
 		chan->dev->card_info->fe_config[chan->number];
 	struct stv6110x_config *tunerconf = (struct stv6110x_config *)
 		chan->dev->card_info->tuner_config[chan->number];
 	const struct stv6110x_devctl *ctl;
 
-	/* tuner 1+2: i2c adapter #0, tuner 3+4: i2c adapter #1 */
 	if (chan->number < 2)
 		i2c = &chan->dev->channel[0].i2c_adapter;
 	else
@@ -158,16 +166,10 @@ static int tuner_attach_stv6110(struct ngene_channel *chan)
 static int tuner_attach_stv6111(struct ngene_channel *chan)
 {
 	struct device *pdev = &chan->dev->pci_dev->dev;
-	struct i2c_adapter *i2c;
+	struct i2c_adapter *i2c = i2c_adapter_from_chan(chan);
 	struct dvb_frontend *fe;
 	u8 adr = 4 + ((chan->number & 1) ? 0x63 : 0x60);
 
-	/* tuner 1+2: i2c adapter #0, tuner 3+4: i2c adapter #1 */
-	if (chan->number < 2)
-		i2c = &chan->dev->channel[0].i2c_adapter;
-	else
-		i2c = &chan->dev->channel[1].i2c_adapter;
-
 	fe = dvb_attach(stv6111_attach, chan->fe, i2c, adr);
 	if (!fe) {
 		fe = dvb_attach(stv6111_attach, chan->fe, i2c, adr & ~4);
@@ -197,10 +199,9 @@ static int drxk_gate_ctrl(struct dvb_frontend *fe, int enable)
 static int tuner_attach_tda18271(struct ngene_channel *chan)
 {
 	struct device *pdev = &chan->dev->pci_dev->dev;
-	struct i2c_adapter *i2c;
+	struct i2c_adapter *i2c = i2c_adapter_from_chan(chan);
 	struct dvb_frontend *fe;
 
-	i2c = &chan->dev->channel[0].i2c_adapter;
 	if (chan->fe->ops.i2c_gate_ctrl)
 		chan->fe->ops.i2c_gate_ctrl(chan->fe, 1);
 	fe = dvb_attach(tda18271c2dd_attach, chan->fe, i2c, 0x60);
@@ -240,7 +241,7 @@ static int tuner_tda18212_ping(struct ngene_channel *chan,
 static int tuner_attach_tda18212(struct ngene_channel *chan, u32 dmdtype)
 {
 	struct device *pdev = &chan->dev->pci_dev->dev;
-	struct i2c_adapter *i2c;
+	struct i2c_adapter *i2c = i2c_adapter_from_chan(chan);
 	struct i2c_client *client;
 	struct tda18212_config config = {
 		.fe = chan->fe,
@@ -262,12 +263,6 @@ static int tuner_attach_tda18212(struct ngene_channel *chan, u32 dmdtype)
 	else
 		board_info.addr = 0x60;
 
-	/* tuner 1+2: i2c adapter #0, tuner 3+4: i2c adapter #1 */
-	if (chan->number < 2)
-		i2c = &chan->dev->channel[0].i2c_adapter;
-	else
-		i2c = &chan->dev->channel[1].i2c_adapter;
-
 	/*
 	 * due to a hardware quirk with the I2C gate on the stv0367+tda18212
 	 * combo, the tda18212 must be probed by reading it's id _twice_ when
@@ -320,7 +315,7 @@ static int tuner_attach_probe(struct ngene_channel *chan)
 static int demod_attach_stv0900(struct ngene_channel *chan)
 {
 	struct device *pdev = &chan->dev->pci_dev->dev;
-	struct i2c_adapter *i2c;
+	struct i2c_adapter *i2c = i2c_adapter_from_chan(chan);
 	struct stv090x_config *feconf = (struct stv090x_config *)
 		chan->dev->card_info->fe_config[chan->number];
 
@@ -620,7 +615,7 @@ static int port_has_xo2(struct i2c_adapter *i2c, u8 *type, u8 *id)
 static int cineS2_probe(struct ngene_channel *chan)
 {
 	struct device *pdev = &chan->dev->pci_dev->dev;
-	struct i2c_adapter *i2c;
+	struct i2c_adapter *i2c = i2c_adapter_from_chan(chan);
 	struct stv090x_config *fe_conf;
 	u8 buf[3];
 	u8 xo2_type, xo2_id, xo2_demodtype;
@@ -628,12 +623,6 @@ static int cineS2_probe(struct ngene_channel *chan)
 	struct i2c_msg i2c_msg = { .flags = 0, .buf = buf };
 	int rc;
 
-	/* tuner 1+2: i2c adapter #0, tuner 3+4: i2c adapter #1 */
-	if (chan->number < 2)
-		i2c = &chan->dev->channel[0].i2c_adapter;
-	else
-		i2c = &chan->dev->channel[1].i2c_adapter;
-
 	if (port_has_xo2(i2c, &xo2_type, &xo2_id)) {
 		xo2_id >>= 2;
 		dev_dbg(pdev, "XO2 on channel %d (type %d, id %d)\n",