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Subject: [media] cxd2820r: dvbv5 statistics for DVB-T2
Author:  Antti Palosaari <cr...@iki.fi>
Date:    Mon Aug 8 21:12:00 2016 -0300

Implement dvbv5 statistics for DVB-T2.

Signed-off-by: Antti Palosaari <cr...@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>

 drivers/media/dvb-frontends/cxd2820r_t2.c | 77 ++++++++++++++++++++++++++++++-
 1 file changed, 76 insertions(+), 1 deletion(-)

---

diff --git a/drivers/media/dvb-frontends/cxd2820r_t2.c 
b/drivers/media/dvb-frontends/cxd2820r_t2.c
index 14c9a26502ed..e2875f2655bd 100644
--- a/drivers/media/dvb-frontends/cxd2820r_t2.c
+++ b/drivers/media/dvb-frontends/cxd2820r_t2.c
@@ -286,8 +286,10 @@ error:
 int cxd2820r_read_status_t2(struct dvb_frontend *fe, enum fe_status *status)
 {
        struct cxd2820r_priv *priv = fe->demodulator_priv;
+       struct dtv_frontend_properties *c = &fe->dtv_property_cache;
        int ret;
-       u8 buf[1];
+       unsigned int utmp;
+       u8 buf[4];
        *status = 0;
 
        ret = cxd2820r_rd_reg(priv, 0x02010 , &buf[0]);
@@ -306,6 +308,79 @@ int cxd2820r_read_status_t2(struct dvb_frontend *fe, enum 
fe_status *status)
 
        dev_dbg(&priv->i2c->dev, "%s: lock=%02x\n", __func__, buf[0]);
 
+       /* Signal strength */
+       if (*status & FE_HAS_SIGNAL) {
+               unsigned int strength;
+
+               ret = cxd2820r_rd_regs(priv, 0x02026, buf, 2);
+               if (ret)
+                       goto error;
+
+               utmp = buf[0] << 8 | buf[1] << 0;
+               utmp = ~utmp & 0x0fff;
+               /* Scale value to 0x0000-0xffff */
+               strength = utmp << 4 | utmp >> 8;
+
+               c->strength.len = 1;
+               c->strength.stat[0].scale = FE_SCALE_RELATIVE;
+               c->strength.stat[0].uvalue = strength;
+       } else {
+               c->strength.len = 1;
+               c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       }
+
+       /* CNR */
+       if (*status & FE_HAS_VITERBI) {
+               unsigned int cnr;
+
+               ret = cxd2820r_rd_regs(priv, 0x02028, buf, 2);
+               if (ret)
+                       goto error;
+
+               utmp = buf[0] << 8 | buf[1] << 0;
+               utmp = utmp & 0x0fff;
+               #define CXD2820R_LOG10_8_24 15151336 /* log10(8) << 24 */
+               if (utmp)
+                       cnr = div_u64((u64)(intlog10(utmp)
+                                     - CXD2820R_LOG10_8_24) * 10000,
+                                     (1 << 24));
+               else
+                       cnr = 0;
+
+               c->cnr.len = 1;
+               c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
+               c->cnr.stat[0].svalue = cnr;
+       } else {
+               c->cnr.len = 1;
+               c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       }
+
+       /* BER */
+       if (*status & FE_HAS_SYNC) {
+               unsigned int post_bit_error;
+
+               ret = cxd2820r_rd_regs(priv, 0x02039, buf, 4);
+               if (ret)
+                       goto error;
+
+               if ((buf[0] >> 4) & 0x01) {
+                       post_bit_error = buf[0] << 24 | buf[1] << 16 |
+                                        buf[2] << 8 | buf[3] << 0;
+                       post_bit_error &= 0x0fffffff;
+               } else {
+                       post_bit_error = 0;
+               }
+
+               priv->post_bit_error += post_bit_error;
+
+               c->post_bit_error.len = 1;
+               c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER;
+               c->post_bit_error.stat[0].uvalue = priv->post_bit_error;
+       } else {
+               c->post_bit_error.len = 1;
+               c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       }
+
        return ret;
 error:
        dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);

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