V4L/DVB (7072): sets the MT2060 IF1 frequency according to EEPROM

Here is a patch for Hauppage Nova-T-Stick and Nova-T-500 users.  It
sets the MT2060 IF1 frequency according to the calibration values
stored in the EEPROM.

It is supposed to enhance the signal quality, but, hey, there is no
guarantee.  Feedbacks would be much appreciated, to know whether it
deserves being applied.

Signed-off-by: Olivier DANET <odanet at caramail.com>
Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/dvb-usb/dib0700_devices.c

@@ -94,12 +94,28 @@ static int bristol_frontend_attach(struct dvb_usb_adapter *adap)
 		(10 + adap->id) << 1, &bristol_dib3000mc_config[adap->id])) == NULL ? -ENODEV : 0;
 }
 
+int eeprom_read(struct i2c_adapter *adap,u8 adrs,u8 *pval)
+{
+	struct i2c_msg msg[2] = {
+		{ .addr = 0x50, .flags = 0,        .buf = &adrs, .len = 1 },
+		{ .addr = 0x50, .flags = I2C_M_RD, .buf = pval,  .len = 1 },
+	};
+	if (i2c_transfer(adap, msg, 2) != 2) return -EREMOTEIO;
+	return 0;
+}
+
 static int bristol_tuner_attach(struct dvb_usb_adapter *adap)
 {
-	struct dib0700_state *st = adap->dev->priv;
+	struct i2c_adapter *prim_i2c = &adap->dev->i2c_adap;
 	struct i2c_adapter *tun_i2c = dib3000mc_get_tuner_i2c_master(adap->fe, 1);
-	return dvb_attach(mt2060_attach,adap->fe, tun_i2c, &bristol_mt2060_config[adap->id],
-		st->mt2060_if1[adap->id]) == NULL ? -ENODEV : 0;
+	s8 a;
+	int if1=1220;
+	if (adap->dev->udev->descriptor.idVendor  == USB_VID_HAUPPAUGE &&
+		adap->dev->udev->descriptor.idProduct == USB_PID_HAUPPAUGE_NOVA_T_500_2) {
+		if (!eeprom_read(prim_i2c,0x59 + adap->id,&a)) if1=1220+a;
+	}
+	return dvb_attach(mt2060_attach,adap->fe, tun_i2c,&bristol_mt2060_config[adap->id],
+		if1) == NULL ? -ENODEV : 0;
 }
 
 /* STK7700D: Pinnacle/Terratec/Hauppauge Dual DVB-T Diversity */
@@ -628,16 +644,22 @@ static struct mt2060_config stk7700p_mt2060_config = {
 
 static int stk7700p_tuner_attach(struct dvb_usb_adapter *adap)
 {
+	struct i2c_adapter *prim_i2c = &adap->dev->i2c_adap;
 	struct dib0700_state *st = adap->dev->priv;
 	struct i2c_adapter *tun_i2c;
-
+	s8 a;
+	int if1=1220;
+	if (adap->dev->udev->descriptor.idVendor  == USB_VID_HAUPPAUGE &&
+		adap->dev->udev->descriptor.idProduct == USB_PID_HAUPPAUGE_NOVA_T_STICK) {
+		if (!eeprom_read(prim_i2c,0x58,&a)) if1=1220+a;
+	}
 	if (st->is_dib7000pc)
 		tun_i2c = dib7000p_get_i2c_master(adap->fe, DIBX000_I2C_INTERFACE_TUNER, 1);
 	else
 		tun_i2c = dib7000m_get_i2c_master(adap->fe, DIBX000_I2C_INTERFACE_TUNER, 1);
 
 	return dvb_attach(mt2060_attach, adap->fe, tun_i2c, &stk7700p_mt2060_config,
-		st->mt2060_if1[0]) == NULL ? -ENODEV : 0;
+		if1) == NULL ? -ENODEV : 0;
 }
 
 /* DIB7070 generic */