V4L/DVB (9055): tuner-xc2028: Do a better job selecting firmware type

Firmware selection is very tricky on this device. This patch do a better
selection of the proper firmware type, by using a code to hint if the
firmware to be loaded should be D2620 or D2633.

It also allows overriding the hint at the control structure.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/common/tuners/tuner-xc2028.c

@@ -1013,11 +1013,6 @@ static int xc2028_set_params(struct dvb_frontend *fe,
 
 	tuner_dbg("%s called\n", __func__);
 
-	if (priv->ctrl.d2633)
-		type |= D2633;
-	else
-		type |= D2620;
-
 	switch(fe->ops.info.type) {
 	case FE_OFDM:
 		bw = p->u.ofdm.bandwidth;
@@ -1032,10 +1027,8 @@ static int xc2028_set_params(struct dvb_frontend *fe,
 		break;
 	case FE_ATSC:
 		bw = BANDWIDTH_6_MHZ;
-		/* The only ATSC firmware (at least on v2.7) is D2633,
-		   so overrides ctrl->d2633 */
-		type |= ATSC| D2633;
-		type &= ~D2620;
+		/* The only ATSC firmware (at least on v2.7) is D2633 */
+		type |= ATSC | D2633;
 		break;
 	/* DVB-S is not supported */
 	default:
@@ -1068,6 +1061,28 @@ static int xc2028_set_params(struct dvb_frontend *fe,
 		tuner_err("error: bandwidth not supported.\n");
 	};
 
+	/*
+	  Selects between D2633 or D2620 firmware.
+	  It doesn't make sense for ATSC, since it should be D2633 on all cases
+	 */
+	if (fe->ops.info.type != FE_ATSC) {
+		switch (priv->ctrl.type) {
+		case XC2028_D2633:
+			type |= D2633;
+			break;
+		case XC2028_D2620:
+			type |= D2620;
+			break;
+		case XC2028_AUTO:
+		default:
+			/* Zarlink seems to need D2633 */
+			if (priv->ctrl.demod == XC3028_FE_ZARLINK456)
+				type |= D2633;
+			else
+				type |= D2620;
+		}
+	}
+
 	/* All S-code tables need a 200kHz shift */
 	if (priv->ctrl.demod)
 		demod = priv->ctrl.demod + 200;

drivers/media/common/tuners/tuner-xc2028.h

@@ -24,16 +24,22 @@
 #define	XC3028_FE_ZARLINK456	4560
 #define	XC3028_FE_CHINA		5200
 
+enum firmware_type {
+	XC2028_AUTO = 0,        /* By default, auto-detects */
+	XC2028_D2633,
+	XC2028_D2620,
+};
+
 struct xc2028_ctrl {
 	char			*fname;
 	int			max_len;
 	unsigned int		scode_table;
 	unsigned int		mts   :1;
-	unsigned int		d2633 :1;
 	unsigned int		input1:1;
 	unsigned int		vhfbw7:1;
 	unsigned int		uhfbw8:1;
 	unsigned int		demod;
+	enum firmware_type	type:2;
 };
 
 struct xc2028_config {

drivers/media/video/cx23885/cx23885-dvb.c

@@ -444,7 +444,8 @@ static int dvb_register(struct cx23885_tsport *port)
 				.fname   = XC3028L_DEFAULT_FIRMWARE,
 				.max_len = 64,
 				.demod   = 5000,
-				.d2633   = 1
+				/* This is true for all demods with v36 firmware? */
+				.type    = XC2028_D2633,
 			};
 
 			fe = dvb_attach(xc2028_attach,