aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorMauro Carvalho Chehab <mchehab@redhat.com>2013-04-07 18:33:13 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2013-04-16 21:22:41 -0300
commit50786ddfa8efef696ec4f72460874f3b46dc2401 (patch)
tree05e48b2240885235c44de9ff76740b1c8f40176f
parentf8fde0e045aeac4417b09bef01b3ada74a4cbc80 (diff)
[media] r820t: Set gain mode to auto
This tuner works with 2 modes: automatic gain mode and manual gain mode. Put it into automatic mode, as we currently don't have any API for manual gain adjustment. The logic to allow setting the manual mode is there, as it is just a few extra code. This way, if/when we latter add support for setting the gain mode, the code is already there. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com> Tested-by: Antti Palosaari <crope@iki.fi>
-rw-r--r--drivers/media/tuners/r820t.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/drivers/media/tuners/r820t.c b/drivers/media/tuners/r820t.c
index ed9cd6569548..0fa355d1737c 100644
--- a/drivers/media/tuners/r820t.c
+++ b/drivers/media/tuners/r820t.c
@@ -321,6 +321,20 @@ static int r820t_xtal_capacitor[][2] = {
};
/*
+ * measured with a Racal 6103E GSM test set at 928 MHz with -60 dBm
+ * input power, for raw results see:
+ * http://steve-m.de/projects/rtl-sdr/gain_measurement/r820t/
+ */
+
+static const int r820t_lna_gain_steps[] = {
+ 0, 9, 13, 40, 38, 13, 31, 22, 26, 31, 26, 14, 19, 5, 35, 13
+};
+
+static const int r820t_mixer_gain_steps[] = {
+ 0, 5, 10, 10, 19, 9, 10, 25, 17, 10, 8, 16, 13, 6, 3, -8
+};
+
+/*
* I2C read/write code and shadow registers logic
*/
static void shadow_store(struct r820t_priv *priv, u8 reg, const u8 *val,
@@ -1094,6 +1108,78 @@ static int r820t_read_gain(struct r820t_priv *priv)
return ((data[3] & 0x0f) << 1) + ((data[3] & 0xf0) >> 4);
}
+static int r820t_set_gain_mode(struct r820t_priv *priv,
+ bool set_manual_gain,
+ int gain)
+{
+ int rc;
+
+ if (set_manual_gain) {
+ int i, total_gain = 0;
+ uint8_t mix_index = 0, lna_index = 0;
+ u8 data[4];
+
+ /* LNA auto off */
+ rc = r820t_write_reg_mask(priv, 0x05, 0x10, 0x10);
+ if (rc < 0)
+ return rc;
+
+ /* Mixer auto off */
+ rc = r820t_write_reg_mask(priv, 0x07, 0, 0x10);
+ if (rc < 0)
+ return rc;
+
+ rc = r820_read(priv, 0x00, data, sizeof(data));
+ if (rc < 0)
+ return rc;
+
+ /* set fixed VGA gain for now (16.3 dB) */
+ rc = r820t_write_reg_mask(priv, 0x0c, 0x08, 0x9f);
+ if (rc < 0)
+ return rc;
+
+ for (i = 0; i < 15; i++) {
+ if (total_gain >= gain)
+ break;
+
+ total_gain += r820t_lna_gain_steps[++lna_index];
+
+ if (total_gain >= gain)
+ break;
+
+ total_gain += r820t_mixer_gain_steps[++mix_index];
+ }
+
+ /* set LNA gain */
+ rc = r820t_write_reg_mask(priv, 0x05, lna_index, 0x0f);
+ if (rc < 0)
+ return rc;
+
+ /* set Mixer gain */
+ rc = r820t_write_reg_mask(priv, 0x07, mix_index, 0x0f);
+ if (rc < 0)
+ return rc;
+ } else {
+ /* LNA */
+ rc = r820t_write_reg_mask(priv, 0x05, 0, 0xef);
+ if (rc < 0)
+ return rc;
+
+ /* Mixer */
+ rc = r820t_write_reg_mask(priv, 0x07, 0x10, 0xef);
+ if (rc < 0)
+ return rc;
+
+ /* set fixed VGA gain for now (26.5 dB) */
+ rc = r820t_write_reg_mask(priv, 0x0c, 0x0b, 0x9f);
+ if (rc < 0)
+ return rc;
+ }
+
+ return 0;
+}
+
+
static int generic_set_freq(struct dvb_frontend *fe,
u32 freq /* in HZ */,
unsigned bw,
@@ -1121,6 +1207,11 @@ static int generic_set_freq(struct dvb_frontend *fe,
rc = r820t_set_mux(priv, lo_freq);
if (rc < 0)
goto err;
+
+ rc = r820t_set_gain_mode(priv, true, 0);
+ if (rc < 0)
+ goto err;
+
rc = r820t_set_pll(priv, lo_freq);
if (rc < 0 || !priv->has_lock)
goto err;

Privacy Policy