media: cx231xx: Add second i2c demod to Hauppauge 975

Hauppauge HVR-975 is a hybrid, dual frontend, single tuner USB device.
It contains lgdt3306a and si2168 frontends and one si2157 tuner. The
lgdt3306a frontend is currently enabled. This creates the second
demodulator and attaches it to the tuner.

Enables lgdt3306a|si2168 + si2157

Signed-off-by: Brad Love <brad@nextdimension.cc>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/usb/cx231xx/cx231xx-cards.c

@@ -979,6 +979,7 @@ struct cx231xx_board cx231xx_boards[] = {
 		.demod_i2c_master = I2C_1_MUX_3,
 		.has_dvb = 1,
 		.demod_addr = 0x59, /* 0xb2 >> 1 */
+		.demod_addr2 = 0x64, /* 0xc8 >> 1 */
 		.norm = V4L2_STD_ALL,
 
 		.input = {{

drivers/media/usb/cx231xx/cx231xx-dvb.c

@@ -1177,14 +1177,17 @@ static int dvb_init(struct cx231xx *dev)
 	{
 		struct i2c_client *client;
 		struct i2c_adapter *adapter;
+		struct i2c_adapter *adapter2;
 		struct i2c_board_info info = {};
 		struct si2157_config si2157_config = {};
 		struct lgdt3306a_config lgdt3306a_config = {};
+		struct si2168_config si2168_config = {};
 
-		/* attach demodulator chip */
+		/* attach first demodulator chip */
 		lgdt3306a_config = hauppauge_955q_lgdt3306a_config;
 		lgdt3306a_config.fe = &dev->dvb->frontend[0];
 		lgdt3306a_config.i2c_adapter = &adapter;
+		lgdt3306a_config.deny_i2c_rptr = 0;
 
 		strlcpy(info.type, "lgdt3306a", sizeof(info.type));
 		info.addr = dev->board.demod_addr;
@@ -1206,10 +1209,43 @@ static int dvb_init(struct cx231xx *dev)
 		}
 
 		dvb->i2c_client_demod[0] = client;
-		dev->dvb->frontend[0]->ops.i2c_gate_ctrl = NULL;
+
+		/* attach second demodulator chip */
+		si2168_config.ts_mode = SI2168_TS_SERIAL;
+		si2168_config.fe = &dev->dvb->frontend[1];
+		si2168_config.i2c_adapter = &adapter2;
+		si2168_config.ts_clock_inv = true;
+
+		memset(&info, 0, sizeof(struct i2c_board_info));
+		strlcpy(info.type, "si2168", sizeof(info.type));
+		info.addr = dev->board.demod_addr2;
+		info.platform_data = &si2168_config;
+
+		request_module(info.type);
+		client = i2c_new_device(adapter, &info);
+		if (client == NULL || client->dev.driver == NULL) {
+			dev_err(dev->dev,
+				"Failed to attach %s frontend.\n", info.type);
+			module_put(dvb->i2c_client_demod[0]->dev.driver->owner);
+			i2c_unregister_device(dvb->i2c_client_demod[0]);
+			result = -ENODEV;
+			goto out_free;
+		}
+
+		if (!try_module_get(client->dev.driver->owner)) {
+			i2c_unregister_device(client);
+			module_put(dvb->i2c_client_demod[0]->dev.driver->owner);
+			i2c_unregister_device(dvb->i2c_client_demod[0]);
+			result = -ENODEV;
+			goto out_free;
+		}
+
+		dvb->i2c_client_demod[1] = client;
+		dvb->frontend[1]->id = 1;
 
 		/* define general-purpose callback pointer */
 		dvb->frontend[0]->callback = cx231xx_tuner_callback;
+		dvb->frontend[1]->callback = cx231xx_tuner_callback;
 
 		/* attach tuner */
 		si2157_config.fe = dev->dvb->frontend[0];
@@ -1227,6 +1263,8 @@ static int dvb_init(struct cx231xx *dev)
 
 		client = i2c_new_device(adapter, &info);
 		if (client == NULL || client->dev.driver == NULL) {
+			module_put(dvb->i2c_client_demod[1]->dev.driver->owner);
+			i2c_unregister_device(dvb->i2c_client_demod[1]);
 			module_put(dvb->i2c_client_demod[0]->dev.driver->owner);
 			i2c_unregister_device(dvb->i2c_client_demod[0]);
 			result = -ENODEV;
@@ -1237,6 +1275,8 @@ static int dvb_init(struct cx231xx *dev)
 			dev_err(dev->dev,
 				"Failed to obtain %s tuner.\n",	info.type);
 			i2c_unregister_device(client);
+			module_put(dvb->i2c_client_demod[1]->dev.driver->owner);
+			i2c_unregister_device(dvb->i2c_client_demod[1]);
 			module_put(dvb->i2c_client_demod[0]->dev.driver->owner);
 			i2c_unregister_device(dvb->i2c_client_demod[0]);
 			result = -ENODEV;
@@ -1244,7 +1284,13 @@ static int dvb_init(struct cx231xx *dev)
 		}
 
 		dev->cx231xx_reset_analog_tuner = NULL;
-		dev->dvb->i2c_client_tuner = client;
+		dvb->i2c_client_tuner = client;
+
+		dvb->frontend[1]->tuner_priv = dvb->frontend[0]->tuner_priv;
+
+		memcpy(&dvb->frontend[1]->ops.tuner_ops,
+			&dvb->frontend[0]->ops.tuner_ops,
+			sizeof(struct dvb_tuner_ops));
 		break;
 	}
 	default: