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Subject: [media] cxd2841er: BER and SNR reading for ISDB-T
Author:  Abylay Ospan <aos...@netup.ru>
Date:    Tue Jul 19 12:22:03 2016 -0300

Added function to read BER for ISDB-T
Also SNR values fixed for ISDB-T

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

 drivers/media/dvb-frontends/cxd2841er.c | 48 ++++++++++++++++++++++++++++++---
 1 file changed, 45 insertions(+), 3 deletions(-)

---

diff --git a/drivers/media/dvb-frontends/cxd2841er.c 
b/drivers/media/dvb-frontends/cxd2841er.c
index 0a2cd133ad9a..0b64158c306e 100644
--- a/drivers/media/dvb-frontends/cxd2841er.c
+++ b/drivers/media/dvb-frontends/cxd2841er.c
@@ -206,6 +206,9 @@ static const struct cxd2841er_cnr_data s2_cn_data[] = {
                (u32)(((iffreq)/48.0)*16777216.0 + 0.5) : \
                (u32)(((iffreq)/41.0)*16777216.0 + 0.5))
 
+static int cxd2841er_freeze_regs(struct cxd2841er_priv *priv);
+static int cxd2841er_unfreeze_regs(struct cxd2841er_priv *priv);
+
 static void cxd2841er_i2c_debug(struct cxd2841er_priv *priv,
                                u8 addr, u8 reg, u8 write,
                                const u8 *data, u32 len)
@@ -1401,6 +1404,41 @@ static int cxd2841er_read_ber_c(struct cxd2841er_priv 
*priv,
        return 0;
 }
 
+static int cxd2841er_read_ber_i(struct cxd2841er_priv *priv,
+               u32 *bit_error, u32 *bit_count)
+{
+       u8 data[3];
+       u8 pktnum[2];
+
+       dev_dbg(&priv->i2c->dev, "%s()\n", __func__);
+       if (priv->state != STATE_ACTIVE_TC) {
+               dev_dbg(&priv->i2c->dev, "%s(): invalid state %d\n",
+                               __func__, priv->state);
+               return -EINVAL;
+       }
+
+       cxd2841er_freeze_regs(priv);
+       cxd2841er_write_reg(priv, I2C_SLVT, 0x00, 0x60);
+       cxd2841er_read_regs(priv, I2C_SLVT, 0x5B, pktnum, sizeof(pktnum));
+       cxd2841er_read_regs(priv, I2C_SLVT, 0x16, data, sizeof(data));
+
+       if (!pktnum[0] && !pktnum[1]) {
+               dev_dbg(&priv->i2c->dev,
+                               "%s(): no valid BER data\n", __func__);
+               cxd2841er_unfreeze_regs(priv);
+               return -EINVAL;
+       }
+
+       *bit_error = ((u32)(data[0] & 0x7F) << 16) |
+               ((u32)data[1] << 8) | data[2];
+       *bit_count = ((((u32)pktnum[0] << 8) | pktnum[1]) * 204 * 8);
+       dev_dbg(&priv->i2c->dev, "%s(): bit_error=%u bit_count=%u\n",
+                       __func__, *bit_error, *bit_count);
+
+       cxd2841er_unfreeze_regs(priv);
+       return 0;
+}
+
 static int cxd2841er_mon_read_ber_s(struct cxd2841er_priv *priv,
                                    u32 *bit_error, u32 *bit_count)
 {
@@ -1798,9 +1836,7 @@ static int cxd2841er_read_snr_i(struct cxd2841er_priv 
*priv, u32 *snr)
                cxd2841er_unfreeze_regs(priv);
                return 0;
        }
-       if (reg > 4996)
-               reg = 4996;
-       *snr = 100 * intlog10(reg) - 9031;
+       *snr = 10000 * (intlog10(reg) >> 24) - 9031;
        cxd2841er_unfreeze_regs(priv);
        return 0;
 }
@@ -1879,6 +1915,9 @@ static void cxd2841er_read_ber(struct dvb_frontend *fe)
        case SYS_DVBC_ANNEX_C:
                ret = cxd2841er_read_ber_c(priv, &bit_error, &bit_count);
                break;
+       case SYS_ISDBT:
+               ret = cxd2841er_read_ber_i(priv, &bit_error, &bit_count);
+               break;
        case SYS_DVBS:
                ret = cxd2841er_mon_read_ber_s(priv, &bit_error, &bit_count);
                break;
@@ -1992,6 +2031,9 @@ static void cxd2841er_read_snr(struct dvb_frontend *fe)
                return;
        }
 
+       dev_dbg(&priv->i2c->dev, "%s(): snr=%d\n",
+                       __func__, (int32_t)tmp);
+
        if (!ret) {
                p->cnr.stat[0].scale = FE_SCALE_DECIBEL;
                p->cnr.stat[0].svalue = tmp;

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