[media] cxd2820r: dvbv5 statistics for DVB-T2

Implement dvbv5 statistics for DVB-T2.

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

1 files changed, 76 insertions, 1 deletions

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);