[media] rtl2832: provide muxed I2C adapter

RTL2832 provides gated / repeater I2C adapter for tuner.
Implement it as a muxed I2C adapter.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/rtl2832.c b/drivers/media/dvb-frontends/rtl2832.c
index 00e63b9..dc46cf08 100644
--- a/drivers/media/dvb-frontends/rtl2832.c
+++ b/drivers/media/dvb-frontends/rtl2832.c
@@ -891,9 +891,29 @@ static void rtl2832_release(struct dvb_frontend *fe)
 	struct rtl2832_priv *priv = fe->demodulator_priv;
 
 	dev_dbg(&priv->i2c->dev, "%s:\n", __func__);
+	i2c_del_mux_adapter(priv->i2c_adapter);
 	kfree(priv);
 }
 
+static int rtl2832_select(struct i2c_adapter *adap, void *mux_priv, u32 chan)
+{
+	struct rtl2832_priv *priv = mux_priv;
+	return rtl2832_i2c_gate_ctrl(&priv->fe, 1);
+}
+
+static int rtl2832_deselect(struct i2c_adapter *adap, void *mux_priv, u32 chan)
+{
+	struct rtl2832_priv *priv = mux_priv;
+	return rtl2832_i2c_gate_ctrl(&priv->fe, 0);
+}
+
+struct i2c_adapter *rtl2832_get_i2c_adapter(struct dvb_frontend *fe)
+{
+	struct rtl2832_priv *priv = fe->demodulator_priv;
+	return priv->i2c_adapter;
+}
+EXPORT_SYMBOL(rtl2832_get_i2c_adapter);
+
 struct dvb_frontend *rtl2832_attach(const struct rtl2832_config *cfg,
 	struct i2c_adapter *i2c)
 {
@@ -918,6 +938,12 @@ struct dvb_frontend *rtl2832_attach(const struct rtl2832_config *cfg,
 	if (ret)
 		goto err;
 
+	/* create muxed i2c adapter */
+	priv->i2c_adapter = i2c_add_mux_adapter(i2c, &i2c->dev, priv, 0, 0, 0,
+			rtl2832_select, rtl2832_deselect);
+	if (priv->i2c_adapter == NULL)
+		goto err;
+
 	/* create dvb_frontend */
 	memcpy(&priv->fe.ops, &rtl2832_ops, sizeof(struct dvb_frontend_ops));
 	priv->fe.demodulator_priv = priv;