[media] tuner-core/simple: get_rf_strength can be tuner mode specific

The get_rf_strength op in tuner-simple is valid only for the radio mode.
But due to the way get_signal in analog_demod_ops was designed it would
overwrite the signal value with a bogus value when in TV mode.
Pass a pointer to the signal value instead, and when not in radio mode
leave it alone in the tuner-simple.
This broke in commit 030755bde42bbed133182b0ece7c7a9c759478e8
(tuner-core: call has_signal for both TV and radio) in kernel 3.6. Before
that this was working correctly. That commit did the right thing, but what
wasn't realized at the time was that tuner-simple should have been updated
as well to restrict setting the signal strength to the radio mode only.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

4 files changed, 27 insertions, 24 deletions

diff --git a/drivers/media/dvb-core/dvb_frontend.h b/drivers/media/dvb-core/dvb_frontend.h
index 44fad1cbcb09..371b6caf486c 100644
--- a/drivers/media/dvb-core/dvb_frontend.h
+++ b/drivers/media/dvb-core/dvb_frontend.h
@@ -245,7 +245,7 @@ struct analog_demod_ops {
 
 	void (*set_params)(struct dvb_frontend *fe,
 			   struct analog_parameters *params);
-	int  (*has_signal)(struct dvb_frontend *fe);
+	int  (*has_signal)(struct dvb_frontend *fe, u16 *signal);
 	int  (*get_afc)(struct dvb_frontend *fe, s32 *afc);
 	void (*tuner_status)(struct dvb_frontend *fe);
 	void (*standby)(struct dvb_frontend *fe);
diff --git a/drivers/media/tuners/tda8290.c b/drivers/media/tuners/tda8290.c
index 20cc7dad6b4e..ab4106c17b4c 100644
--- a/drivers/media/tuners/tda8290.c
+++ b/drivers/media/tuners/tda8290.c
@@ -391,7 +391,7 @@ static void tda8295_agc2_out(struct dvb_frontend *fe, int enable)
 	tuner_i2c_xfer_send(&priv->i2c_props, set_gpio_val, 2);
 }
 
-static int tda8295_has_signal(struct dvb_frontend *fe)
+static int tda8295_has_signal(struct dvb_frontend *fe, u16 *signal)
 {
 	struct tda8290_priv *priv = fe->analog_demod_priv;
 
@@ -399,7 +399,8 @@ static int tda8295_has_signal(struct dvb_frontend *fe)
 	unsigned char ret;
 
 	tuner_i2c_xfer_send_recv(&priv->i2c_props, &hvpll_stat, 1, &ret, 1);
-	return (ret & 0x01) ? 65535 : 0;
+	*signal = (ret & 0x01) ? 65535 : 0;
+	return 0;
 }
 
 /*---------------------------------------------------------------------*/
@@ -408,7 +409,7 @@ static void tda8295_set_params(struct dvb_frontend *fe,
 			       struct analog_parameters *params)
 {
 	struct tda8290_priv *priv = fe->analog_demod_priv;
-
+	u16 signal = 0;
 	unsigned char blanking_mode[]     = { 0x1d, 0x00 };
 
 	set_audio(fe, params);
@@ -436,7 +437,8 @@ static void tda8295_set_params(struct dvb_frontend *fe,
 	if (priv->cfg.agcf)
 		priv->cfg.agcf(fe);
 
-	if (tda8295_has_signal(fe))
+	tda8295_has_signal(fe, &signal);
+	if (signal)
 		tuner_dbg("tda8295 is locked\n");
 	else
 		tuner_dbg("tda8295 not locked, no signal?\n");
@@ -447,7 +449,7 @@ static void tda8295_set_params(struct dvb_frontend *fe,
 
 /*---------------------------------------------------------------------*/
 
-static int tda8290_has_signal(struct dvb_frontend *fe)
+static int tda8290_has_signal(struct dvb_frontend *fe, u16 *signal)
 {
 	struct tda8290_priv *priv = fe->analog_demod_priv;
 
@@ -456,7 +458,8 @@ static int tda8290_has_signal(struct dvb_frontend *fe)
 
 	tuner_i2c_xfer_send_recv(&priv->i2c_props,
 				 i2c_get_afc, ARRAY_SIZE(i2c_get_afc), &afc, 1);
-	return (afc & 0x80)? 65535:0;
+	*signal = (afc & 0x80) ? 65535 : 0;
+	return 0;
 }
 
 /*---------------------------------------------------------------------*/
diff --git a/drivers/media/tuners/tuner-simple.c b/drivers/media/tuners/tuner-simple.c
index 39e7e583c8c0..ca274c2d8c70 100644
--- a/drivers/media/tuners/tuner-simple.c
+++ b/drivers/media/tuners/tuner-simple.c
@@ -115,6 +115,7 @@ struct tuner_simple_priv {
 
 	u32 frequency;
 	u32 bandwidth;
+	bool radio_mode;
 };
 
 /* ---------------------------------------------------------------------- */
@@ -189,7 +190,7 @@ static int simple_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
 	struct tuner_simple_priv *priv = fe->tuner_priv;
 	int signal;
 
-	if (priv->i2c_props.adap == NULL)
+	if (priv->i2c_props.adap == NULL || !priv->radio_mode)
 		return -EINVAL;
 
 	signal = tuner_signal(tuner_read_status(fe));
@@ -776,11 +777,13 @@ static int simple_set_params(struct dvb_frontend *fe,
 
 	switch (params->mode) {
 	case V4L2_TUNER_RADIO:
+		priv->radio_mode = true;
 		ret = simple_set_radio_freq(fe, params);
 		priv->frequency = params->frequency * 125 / 2;
 		break;
 	case V4L2_TUNER_ANALOG_TV:
 	case V4L2_TUNER_DIGITAL_TV:
+		priv->radio_mode = false;
 		ret = simple_set_tv_freq(fe, params);
 		priv->frequency = params->frequency * 62500;
 		break;
diff --git a/drivers/media/v4l2-core/tuner-core.c b/drivers/media/v4l2-core/tuner-core.c
index a0b10e6b55ed..ddc9379eb276 100644
--- a/drivers/media/v4l2-core/tuner-core.c
+++ b/drivers/media/v4l2-core/tuner-core.c
@@ -218,16 +218,6 @@ static void fe_standby(struct dvb_frontend *fe)
 		fe_tuner_ops->sleep(fe);
 }
 
-static int fe_has_signal(struct dvb_frontend *fe)
-{
-	u16 strength;
-
-	if (fe->ops.tuner_ops.get_rf_strength(fe, &strength) < 0)
-		return 0;
-
-	return strength;
-}
-
 static int fe_set_config(struct dvb_frontend *fe, void *priv_cfg)
 {
 	struct dvb_tuner_ops *fe_tuner_ops = &fe->ops.tuner_ops;
@@ -436,7 +426,7 @@ static void set_type(struct i2c_client *c, unsigned int type,
 		       sizeof(struct analog_demod_ops));
 
 		if (fe_tuner_ops->get_rf_strength)
-			analog_ops->has_signal = fe_has_signal;
+			analog_ops->has_signal = fe_tuner_ops->get_rf_strength;
 		if (fe_tuner_ops->get_afc)
 			analog_ops->get_afc = fe_tuner_ops->get_afc;
 
@@ -1060,9 +1050,12 @@ static void tuner_status(struct dvb_frontend *fe)
 		if (tuner_status & TUNER_STATUS_STEREO)
 			tuner_info("Stereo:          yes\n");
 	}
-	if (analog_ops->has_signal)
-		tuner_info("Signal strength: %d\n",
-			   analog_ops->has_signal(fe));
+	if (analog_ops->has_signal) {
+		u16 signal;
+
+		if (!analog_ops->has_signal(fe, &signal))
+			tuner_info("Signal strength: %hu\n", signal);
+	}
 }
 
 /*
@@ -1181,8 +1174,12 @@ static int tuner_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
 		return 0;
 	if (vt->type == t->mode && analog_ops->get_afc)
 		analog_ops->get_afc(&t->fe, &vt->afc);
-	if (analog_ops->has_signal)
-		vt->signal = analog_ops->has_signal(&t->fe);
+	if (vt->type == t->mode && analog_ops->has_signal) {
+		u16 signal = (u16)vt->signal;
+
+		if (!analog_ops->has_signal(&t->fe, &signal))
+			vt->signal = signal;
+	}
 	if (vt->type != V4L2_TUNER_RADIO) {
 		vt->capability |= V4L2_TUNER_CAP_NORM;
 		vt->rangelow = tv_range[0] * 16;