V4L/DVB (12294): b2c2: Use dvb-pll for Cablestar2

The dvb-pll code should do the same thing that
alps_tdee4_stv0297_tuner_set_params() was doing.  Except the dvb-pll code
will check for tuner presence when attaching, while the old code didn't.

This tuner appears to not be behind the stv0297's I2C gate but is instead
on a different I2C adapter provided by the flexcop chip.  The old code
would turn the I2C gate off each time the tuner was used.  I've changed it
to turn the gate off when the tuner is attached and then disable the gate
control function.  This should result in the gate staying off, which should
be even better.

[hverkuil@xs4all.nl: fix compile error]
Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/b2c2/flexcop-fe-tuner.c

@@ -511,54 +511,7 @@ static int airstar_atsc3_attach(struct flexcop_device *fc,
 #endif
 
 /* CableStar2 DVB-C */
-#if FE_SUPPORTED(STV0297)
-static int alps_tdee4_stv0297_tuner_set_params(struct dvb_frontend* fe,
-		struct dvb_frontend_parameters *fep)
-{
-	struct flexcop_device *fc = fe->dvb->priv;
-	u8 buf[4];
-	u16 div;
-	int ret;
-
-/* 62.5 kHz * 10 */
-#define REF_FREQ    625
-#define FREQ_OFFSET 36125
-
-	div = ((fep->frequency/1000 + FREQ_OFFSET) * 10) / REF_FREQ;
-/* 4 MHz = 4000 KHz */
-
-	buf[0] = (u8)( div >> 8) & 0x7f;
-	buf[1] = (u8)        div & 0xff;
-
-/* F(osc) = N * Reference Freq. (62.5 kHz)
- * byte 2 :  0 N14 N13 N12 N11 N10 N9  N8
- * byte 3 : N7 N6  N5  N4  N3  N2  N1  N0
- * byte 4 : 1  *   *   AGD R3  R2  R1  R0
- * byte 5 : C1 *   RE  RTS BS4 BS3 BS2 BS1
- * AGD = 1, R3 R2 R1 R0 = 0 1 0 1 => byte 4 = 1**10101 = 0x95 */
-	buf[2] = 0x95;
-
-/* Range(MHz)  C1 *  RE RTS BS4 BS3 BS2 BS1  Byte 5
- *  47 - 153   0  *  0   0   0   0   0   1   0x01
- * 153 - 430   0  *  0   0   0   0   1   0   0x02
- * 430 - 822   0  *  0   0   1   0   0   0   0x08
- * 822 - 862   1  *  0   0   1   0   0   0   0x88 */
-
-	     if (fep->frequency <= 153000000) buf[3] = 0x01;
-	else if (fep->frequency <= 430000000) buf[3] = 0x02;
-	else if (fep->frequency <= 822000000) buf[3] = 0x08;
-	else buf[3] = 0x88;
-
-	if (fe->ops.i2c_gate_ctrl)
-		fe->ops.i2c_gate_ctrl(fe, 0);
-	deb_tuner("tuner buffer for %d Hz: %x %x %x %x\n", fep->frequency,
-	buf[0], buf[1], buf[2], buf[3]);
-	ret = fc->i2c_request(&fc->fc_i2c_adap[2],
-			FC_WRITE, 0x61, buf[0], &buf[1], 3);
-	deb_tuner("tuner write returned: %d\n",ret);
-	return ret;
-}
-
+#if FE_SUPPORTED(STV0297) && FE_SUPPORTED(PLL)
 static u8 alps_tdee4_stv0297_inittab[] = {
 	0x80, 0x01,
 	0x80, 0x00,
@@ -642,13 +595,25 @@ static int cablestar2_attach(struct flexcop_device *fc,
 {
 	fc->fc_i2c_adap[0].no_base_addr = 1;
 	fc->fe = dvb_attach(stv0297_attach, &alps_tdee4_stv0297_config, i2c);
-	if (!fc->fe) {
+	if (!fc->fe)
+		goto fail;
+
+	/* This tuner doesn't use the stv0297's I2C gate, but instead the
+	 * tuner is connected to a different flexcop I2C adapter.  */
+	if (fc->fe->ops.i2c_gate_ctrl)
+		fc->fe->ops.i2c_gate_ctrl(fc->fe, 0);
+	fc->fe->ops.i2c_gate_ctrl = NULL;
+
+	if (!dvb_attach(dvb_pll_attach, fc->fe, 0x61,
+			&fc->fc_i2c_adap[2].i2c_adap, DVB_PLL_TDEE4))
+		goto fail;
+
+	return 1;
+
+fail:
 	/* Reset for next frontend to try */
 	fc->fc_i2c_adap[0].no_base_addr = 0;
 	return 0;
-	}
-	fc->fe->ops.tuner_ops.set_params = alps_tdee4_stv0297_tuner_set_params;
-	return 1;
 }
 #else
 #define cablestar2_attach NULL