[media] cxd2820r: dvbv5 statistics for DVB-C
Implement dvbv5 statistics for DVB-C.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
diff --git a/drivers/media/dvb-frontends/cxd2820r_c.c b/drivers/media/dvb-frontends/cxd2820r_c.c
index 957ec94..7cdcd55 100644
--- a/drivers/media/dvb-frontends/cxd2820r_c.c
+++ b/drivers/media/dvb-frontends/cxd2820r_c.c
@@ -260,11 +260,13 @@
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 @@
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);