V4L/DVB (10876): tda18271: add support for AGC configuration via tuner callback

The tda827x driver supports a feature that the tda18271 driver was lacking
until now.  This patch adds support for device-level configuration via the
tuner callback configuration interface.
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/common/tuners/tda18271-fe.c

@@ -818,6 +818,38 @@ fail:
 	return ret;
 }
 
+/* ------------------------------------------------------------------ */
+
+static int tda18271_agc(struct dvb_frontend *fe)
+{
+	struct tda18271_priv *priv = fe->tuner_priv;
+	int ret = 0;
+
+	switch (priv->config) {
+	case 0:
+		/* no LNA */
+		tda_dbg("no agc configuration provided\n");
+		break;
+	case 3:
+		/* switch with GPIO of saa713x */
+		tda_dbg("invoking callback\n");
+		if (fe->callback)
+			ret = fe->callback(priv->i2c_props.adap->algo_data,
+					   DVB_FRONTEND_COMPONENT_TUNER,
+					   TDA18271_CALLBACK_CMD_AGC_ENABLE,
+					   priv->mode);
+		break;
+	case 1:
+	case 2:
+	default:
+		/* n/a - currently not supported */
+		tda_err("unsupported configuration: %d\n", priv->config);
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+
 static int tda18271_tune(struct dvb_frontend *fe,
 			 struct tda18271_std_map_item *map, u32 freq, u32 bw)
 {
@@ -827,6 +859,10 @@ static int tda18271_tune(struct dvb_frontend *fe,
 	tda_dbg("freq = %d, ifc = %d, bw = %d, agc_mode = %d, std = %d\n",
 		freq, map->if_freq, bw, map->agc_mode, map->std);
 
+	ret = tda18271_agc(fe);
+	if (tda_fail(ret))
+		tda_warn("failed to configure agc\n");
+
 	ret = tda18271_init(fe);
 	if (tda_fail(ret))
 		goto fail;
@@ -1159,6 +1195,7 @@ struct dvb_frontend *tda18271_attach(struct dvb_frontend *fe, u8 addr,
 		/* new tuner instance */
 		priv->gate = (cfg) ? cfg->gate : TDA18271_GATE_AUTO;
 		priv->role = (cfg) ? cfg->role : TDA18271_MASTER;
+		priv->config = (cfg) ? cfg->config : 0;
 		priv->cal_initialized = false;
 		mutex_init(&priv->lock);
 

drivers/media/common/tuners/tda18271-priv.h

@@ -91,11 +91,6 @@ enum tda18271_pll {
 	TDA18271_CAL_PLL,
 };
 
-enum tda18271_mode {
-	TDA18271_ANALOG,
-	TDA18271_DIGITAL,
-};
-
 struct tda18271_map_layout;
 
 enum tda18271_ver {
@@ -114,6 +109,7 @@ struct tda18271_priv {
 	enum tda18271_i2c_gate gate;
 	enum tda18271_ver id;
 
+	unsigned int config; /* interface to saa713x / tda829x */
 	unsigned int tm_rfcal;
 	unsigned int cal_initialized:1;
 	unsigned int small_i2c:1;

drivers/media/common/tuners/tda18271.h

@@ -79,6 +79,16 @@ struct tda18271_config {
 
 	/* some i2c providers cant write all 39 registers at once */
 	unsigned int small_i2c:1;
+
+	/* interface to saa713x / tda829x */
+	unsigned int config;
+};
+
+#define TDA18271_CALLBACK_CMD_AGC_ENABLE 0
+
+enum tda18271_mode {
+	TDA18271_ANALOG = 0,
+	TDA18271_DIGITAL,
 };
 
 #if defined(CONFIG_MEDIA_TUNER_TDA18271) || (defined(CONFIG_MEDIA_TUNER_TDA18271_MODULE) && defined(MODULE))

drivers/media/common/tuners/tda8290.c

@@ -624,6 +624,7 @@ static int tda829x_find_tuner(struct dvb_frontend *fe)
 
 	if ((data == 0x83) || (data == 0x84)) {
 		priv->ver |= TDA18271;
+		tda829x_tda18271_config.config = priv->cfg.config;
 		dvb_attach(tda18271_attach, fe, priv->tda827x_addr,
 			   priv->i2c_props.adap, &tda829x_tda18271_config);
 	} else {