[media] rtl28xxu: fix DVB FE callback

DVB FE callback functionality went broken after I moved tuners to
demod muxed I2C adapter. That happens because driver state was
carried by I2C adapter and when mux is used there is one adapter
more in a chain.
USB adapter <-> I2C adapter <-> muxed I2C adapter

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

1 files changed, 17 insertions, 2 deletions

diff --git a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
index 0d37d0c06d79..1f29307b9d72 100644
--- a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
+++ b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
@@ -740,8 +740,23 @@ static int rtl2832u_tuner_callback(struct dvb_usb_device *d, int cmd, int arg)
 static int rtl2832u_frontend_callback(void *adapter_priv, int component,
                 int cmd, int arg)
 {
-        struct i2c_adapter *adap = adapter_priv;
-        struct dvb_usb_device *d = i2c_get_adapdata(adap);
+        struct i2c_adapter *adapter = adapter_priv;
+        struct device *parent = adapter->dev.parent;
+        struct i2c_adapter *parent_adapter;
+        struct dvb_usb_device *d;
+
+        /*
+         * All tuners are connected to demod muxed I2C adapter. We have to
+         * resolve its parent adapter in order to get handle for this driver
+         * private data. That is a bit hackish solution, GPIO or direct driver
+         * callback would be better...
+         */
+        if (parent != NULL && parent->type == &i2c_adapter_type)
+                parent_adapter = to_i2c_adapter(parent);
+        else
+                return -EINVAL;
+
+        d = i2c_get_adapdata(parent_adapter);
 
         dev_dbg(&d->udev->dev, "%s: component=%d cmd=%d arg=%d\n",
                         __func__, component, cmd, arg);