Add gain control for LNA, Mixer and IF. Expose controls via DVB
frontend .set_config callback.
Cc: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
Signed-off-by: Antti Palosaari <crope@xxxxxx>
---
drivers/media/tuners/r820t.c | 38 ++++++++++++++++++++++++++++++++++++++
drivers/media/tuners/r820t.h | 7 +++++++
2 files changed, 45 insertions(+)
diff --git a/drivers/media/tuners/r820t.c b/drivers/media/tuners/r820t.c
index d9ee43f..5a926a3 100644
--- a/drivers/media/tuners/r820t.c
+++ b/drivers/media/tuners/r820t.c
@@ -1251,6 +1251,43 @@ static int r820t_set_gain_mode(struct r820t_priv *priv,
}
#endif
+static int r820t_set_config(struct dvb_frontend *fe, void *priv_cfg)
+{
+ struct r820t_priv *priv = fe->tuner_priv;
+ struct r820t_ctrl *ctrl = priv_cfg;
+ int rc;
+
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 1);
+
+ if (ctrl->lna_gain == INT_MIN)
+ rc = r820t_write_reg_mask(priv, 0x05, 0x00, 0x10);
+ else
+ rc = r820t_write_reg_mask(priv, 0x05,
+ 0x10 | ctrl->lna_gain, 0x1f);
+ if (rc < 0)
+ goto err;
+
+ if (ctrl->mixer_gain == INT_MIN)
+ rc = r820t_write_reg_mask(priv, 0x07, 0x10, 0x10);
+ else
+ rc = r820t_write_reg_mask(priv, 0x07,
+ 0x00 | ctrl->mixer_gain, 0x1f);
+ if (rc < 0)
+ goto err;
+
+ if (ctrl->if_gain == INT_MIN)
+ rc = r820t_write_reg_mask(priv, 0x0c, 0x10, 0x10);
+ else
+ rc = r820t_write_reg_mask(priv, 0x0c,
+ 0x00 | ctrl->if_gain, 0x1f);
+err:
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0);
+
+ return rc;
+}
+
static int generic_set_freq(struct dvb_frontend *fe,
u32 freq /* in HZ */,
unsigned bw,
@@ -2275,6 +2312,7 @@ static const struct dvb_tuner_ops r820t_tuner_ops = {
.release = r820t_release,
.sleep = r820t_sleep,
.set_params = r820t_set_params,
+ .set_config = r820t_set_config,
.set_analog_params = r820t_set_analog_freq,
.get_if_frequency = r820t_get_if_frequency,
.get_rf_strength = r820t_signal,
diff --git a/drivers/media/tuners/r820t.h b/drivers/media/tuners/r820t.h
index 48af354..42c0d8e 100644
--- a/drivers/media/tuners/r820t.h
+++ b/drivers/media/tuners/r820t.h
@@ -42,6 +42,13 @@ struct r820t_config {
bool use_predetect;
};
+/* set INT_MIN for automode */
+struct r820t_ctrl {
+ int lna_gain;
+ int mixer_gain;
+ int if_gain;
+};
+
#if IS_ENABLED(CONFIG_MEDIA_TUNER_R820T)
struct dvb_frontend *r820t_attach(struct dvb_frontend *fe,
struct i2c_adapter *i2c,
--
1.8.5.3
--
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