V4L/DVB (4436): Dvb-pll support for MT352/ZL10353 based tuners.

Typical wiring of MT352 and ZL10353 based tuners differs from dvb-pll's
expectation that the PLL is directly accessible.  On these boards, the
PLL is actually hidden behind the demodulator, and as such can only be
accessed via the demodulator's interface.  It was failing to communicate
with the PLL during an attach test and subsequently not connecting the
tuner ops.
By passing a NULL I2C bus handle to dvb_pll_attach, this accessibility
check can be bypassed.  Do this for the affected boards.  Also fix a
possible NULL dereference at sleep time, which would otherwise be
exposed by this change.

Signed-off-by: Chris Pascoe <c.pascoe@itee.uq.edu.au>
Acked-by: Andrew de Quincey <adq_dvb@lidskialf.net>
Acked-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/frontends/dvb-pll.c

@@ -493,6 +493,9 @@ static int dvb_pll_sleep(struct dvb_frontend *fe)
 	int i;
 	int result;
 
+	if (priv->i2c == NULL)
+		return -EINVAL;
+
 	for (i = 0; i < priv->pll_desc->count; i++) {
 		if (priv->pll_desc->entries[i].limit == 0)
 			break;

drivers/media/video/cx88/cx88-dvb.c

@@ -543,8 +543,7 @@ static int dvb_register(struct cx8802_dev *dev)
 						 &dev->core->i2c_adap);
 		if (dev->dvb.frontend != NULL) {
 			dvb_attach(dvb_pll_attach, dev->dvb.frontend, 0x60,
-				       &dev->core->i2c_adap,
-				       &dvb_pll_thomson_dtt7579);
+				   NULL, &dvb_pll_thomson_dtt7579);
 			break;
 		}
 		/* ZL10353 replaces MT352 on later cards */
@@ -552,8 +551,7 @@ static int dvb_register(struct cx8802_dev *dev)
 						   &dev->core->i2c_adap);
 		if (dev->dvb.frontend != NULL) {
 			dvb_attach(dvb_pll_attach, dev->dvb.frontend, 0x60,
-				       &dev->core->i2c_adap,
-				       &dvb_pll_thomson_dtt7579);
+				   NULL, &dvb_pll_thomson_dtt7579);
 		}
 		break;
 	case CX88_BOARD_DVICO_FUSIONHDTV_DVB_T_DUAL:
@@ -563,8 +561,7 @@ static int dvb_register(struct cx8802_dev *dev)
 						 &dev->core->i2c_adap);
 		if (dev->dvb.frontend != NULL) {
 			dvb_attach(dvb_pll_attach, dev->dvb.frontend, 0x61,
-				       &dev->core->i2c_adap,
-				       &dvb_pll_thomson_dtt7579);
+				   NULL, &dvb_pll_thomson_dtt7579);
 			break;
 		}
 		/* ZL10353 replaces MT352 on later cards */
@@ -572,8 +569,7 @@ static int dvb_register(struct cx8802_dev *dev)
 						   &dev->core->i2c_adap);
 		if (dev->dvb.frontend != NULL) {
 			dvb_attach(dvb_pll_attach, dev->dvb.frontend, 0x61,
-				       &dev->core->i2c_adap,
-				       &dvb_pll_thomson_dtt7579);
+				   NULL, &dvb_pll_thomson_dtt7579);
 		}
 		break;
 	case CX88_BOARD_DVICO_FUSIONHDTV_DVB_T1:
@@ -581,8 +577,7 @@ static int dvb_register(struct cx8802_dev *dev)
 						 &dev->core->i2c_adap);
 		if (dev->dvb.frontend != NULL) {
 			dvb_attach(dvb_pll_attach, dev->dvb.frontend, 0x61,
-				       &dev->core->i2c_adap,
-				       &dvb_pll_lg_z201);
+				   NULL, &dvb_pll_lg_z201);
 		}
 		break;
 	case CX88_BOARD_KWORLD_DVB_T:
@@ -592,8 +587,7 @@ static int dvb_register(struct cx8802_dev *dev)
 						 &dev->core->i2c_adap);
 		if (dev->dvb.frontend != NULL) {
 			dvb_attach(dvb_pll_attach, dev->dvb.frontend, 0x61,
-				       &dev->core->i2c_adap,
-				       &dvb_pll_unknown_1);
+				   NULL, &dvb_pll_unknown_1);
 		}
 		break;
 	case CX88_BOARD_DNTV_LIVE_DVB_T_PRO: