[media] DVB-C read signal strength added for Sony demod

cxd2841er_read_agc_gain_c added to obtain signal strength.
signal strength now relay on AGC value.

Signed-off-by: Abylay Ospan <aospan@netup.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/cxd2841er.c b/drivers/media/dvb-frontends/cxd2841er.c
index c960e8a725cc..0c7d92aee857 100644
--- a/drivers/media/dvb-frontends/cxd2841er.c
+++ b/drivers/media/dvb-frontends/cxd2841er.c
@@ -1656,6 +1656,21 @@ static int cxd2841er_read_snr_i(struct cxd2841er_priv *priv, u32 *snr)
         return 0;
 }
 
+static u16 cxd2841er_read_agc_gain_c(struct cxd2841er_priv *priv,
+                                        u8 delsys)
+{
+        u8 data[2];
+
+        cxd2841er_write_reg(
+                priv, I2C_SLVT, 0x00, 0x40);
+        cxd2841er_read_regs(priv, I2C_SLVT, 0x49, data, 2);
+        dev_dbg(&priv->i2c->dev,
+                        "%s(): AGC value=%u\n",
+                        __func__, (((u16)data[0] & 0x0F) << 8) |
+                        (u16)(data[1] & 0xFF));
+        return ((((u16)data[0] & 0x0F) << 8) | (u16)(data[1] & 0xFF)) << 4;
+}
+
 static u16 cxd2841er_read_agc_gain_t_t2(struct cxd2841er_priv *priv,
                                         u8 delsys)
 {
@@ -1735,6 +1750,14 @@ static void cxd2841er_read_signal_strength(struct dvb_frontend *fe)
 
         dev_dbg(&priv->i2c->dev, "%s()\n", __func__);
         switch (p->delivery_system) {
+        case SYS_DVBC_ANNEX_A:
+        case SYS_DVBC_ANNEX_B:
+        case SYS_DVBC_ANNEX_C:
+                strength = 65535 - cxd2841er_read_agc_gain_c(
+                                priv, p->delivery_system);
+                p->strength.stat[0].scale = FE_SCALE_RELATIVE;
+                p->strength.stat[0].uvalue = strength;
+                break;
         case SYS_DVBT:
         case SYS_DVBT2:
                 strength = cxd2841er_read_agc_gain_t_t2(priv,