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Subject: [media] cxd2820r: dvbv5 statistics for DVB-C
Author:  Antti Palosaari <cr...@iki.fi>
Date:    Mon Aug 8 23:03:32 2016 -0300

Implement dvbv5 statistics for DVB-C.

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

 drivers/media/dvb-frontends/cxd2820r_c.c | 104 ++++++++++++++++++++++++++++++-
 1 file changed, 102 insertions(+), 2 deletions(-)

---

diff --git a/drivers/media/dvb-frontends/cxd2820r_c.c 
b/drivers/media/dvb-frontends/cxd2820r_c.c
index 957ec94c7243..7cdcd5535d06 100644
--- a/drivers/media/dvb-frontends/cxd2820r_c.c
+++ b/drivers/media/dvb-frontends/cxd2820r_c.c
@@ -260,11 +260,13 @@ int cxd2820r_read_ucblocks_c(struct dvb_frontend *fe, u32 
*ucblocks)
 int cxd2820r_read_status_c(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[2];
+       unsigned int utmp;
+       u8 buf[3];
        *status = 0;
 
-       ret = cxd2820r_rd_regs(priv, 0x10088, buf, sizeof(buf));
+       ret = cxd2820r_rd_regs(priv, 0x10088, buf, 2);
        if (ret)
                goto error;
 
@@ -281,6 +283,104 @@ int cxd2820r_read_status_c(struct dvb_frontend *fe, enum 
fe_status *status)
        dev_dbg(&priv->i2c->dev, "%s: lock=%02x %02x\n", __func__, buf[0],
                        buf[1]);
 
+       /* Signal strength */
+       if (*status & FE_HAS_SIGNAL) {
+               unsigned int strength;
+
+               ret = cxd2820r_rd_regs(priv, 0x10049, buf, 2);
+               if (ret)
+                       goto error;
+
+               utmp = buf[0] << 8 | buf[1] << 0;
+               utmp = 511 - sign_extend32(utmp, 9);
+               /* Scale value to 0x0000-0xffff */
+               strength = utmp << 6 | utmp >> 4;
+
+               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, const_a, const_b;
+
+               ret = cxd2820r_rd_reg(priv, 0x10019, &buf[0]);
+               if (ret)
+                       goto error;
+
+               if (((buf[0] >> 0) & 0x03) % 2) {
+                       const_a = 8750;
+                       const_b = 650;
+               } else {
+                       const_a = 9500;
+                       const_b = 760;
+               }
+
+               ret = cxd2820r_rd_reg(priv, 0x1004d, &buf[0]);
+               if (ret)
+                       goto error;
+
+               utmp = buf[0] << 0;
+               #define CXD2820R_LOG2_E_24 24204406 /* log2(e) << 24 */
+               if (utmp)
+                       cnr = div_u64((u64)(intlog2(const_b) - intlog2(utmp))
+                                     * const_a, CXD2820R_LOG2_E_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;
+               bool start_ber;
+
+               if (priv->ber_running) {
+                       ret = cxd2820r_rd_regs(priv, 0x10076, buf, 3);
+                       if (ret)
+                               goto error;
+
+                       if ((buf[2] >> 7) & 0x01) {
+                               post_bit_error = buf[2] << 16 | buf[1] << 8 |
+                                                buf[0] << 0;
+                               post_bit_error &= 0x0fffff;
+                               start_ber = true;
+                       } else {
+                               post_bit_error = 0;
+                               start_ber = false;
+                       }
+               } else {
+                       post_bit_error = 0;
+                       start_ber = true;
+               }
+
+               if (start_ber) {
+                       ret = cxd2820r_wr_reg(priv, 0x10079, 0x01);
+                       if (ret)
+                               goto error;
+                       priv->ber_running = true;
+               }
+
+               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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