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[media] cxd2820r: dvbv5 statistics for DVB-C

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Implement dvbv5 statistics for DVB-C.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Antti Palosaari 2016-08-08 23:03:32 -03:00 committed by Mauro Carvalho Chehab
parent 91171fb63e
commit 90d5d2e3f0
1 changed files with 102 additions and 2 deletions
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104
drivers/media/dvb-frontends/cxd2820r_c.c
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@ -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);