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authorAbylay Ospan <aospan@netup.ru>2016-07-15 17:04:17 -0300
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2016-07-16 07:01:31 -0300
commite05b1872f29a85532c2b34e3a4974a27158f1463 (patch)
treeb7201efe76c670e7d7610441106d00f7bb46b1fb /drivers/media
parenta6f330cbb3438ec9506b0d94309ab48e49f97884 (diff)
downloadlinux-e05b1872f29a85532c2b34e3a4974a27158f1463.tar.bz2
[media] cxd2841er: Reading SNR for DVB-C added
Now driver returns correct values for DVB-C: SNR (in dB) [mchehab@s-opensource.com: fix a new function to be static] Signed-off-by: Abylay Ospan <aospan@netup.ru> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/dvb-frontends/cxd2841er.c89
1 files changed, 81 insertions, 8 deletions
diff --git a/drivers/media/dvb-frontends/cxd2841er.c b/drivers/media/dvb-frontends/cxd2841er.c
index 623b04f37984..09c39346167f 100644
--- a/drivers/media/dvb-frontends/cxd2841er.c
+++ b/drivers/media/dvb-frontends/cxd2841er.c
@@ -1570,7 +1570,8 @@ static int cxd2841er_read_ber_t(struct cxd2841er_priv *priv,
return 0;
}
-static u32 cxd2841er_dvbs_read_snr(struct cxd2841er_priv *priv, u8 delsys)
+static u32 cxd2841er_dvbs_read_snr(struct cxd2841er_priv *priv,
+ u8 delsys, u32 *snr)
{
u8 data[3];
u32 res = 0, value;
@@ -1628,9 +1629,71 @@ static u32 cxd2841er_dvbs_read_snr(struct cxd2841er_priv *priv, u8 delsys)
} else {
dev_dbg(&priv->i2c->dev,
"%s(): no data available\n", __func__);
+ return -EINVAL;
}
done:
- return res;
+ *snr = res;
+ return 0;
+}
+
+static uint32_t sony_log(uint32_t x)
+{
+ return (((10000>>8)*(intlog2(x)>>16) + LOG2_E_100X/2)/LOG2_E_100X);
+}
+
+static int cxd2841er_read_snr_c(struct cxd2841er_priv *priv, u32 *snr)
+{
+ u32 reg;
+ u8 data[2];
+ enum sony_dvbc_constellation_t qam = SONY_DVBC_CONSTELLATION_16QAM;
+
+ *snr = 0;
+ if (priv->state != STATE_ACTIVE_TC) {
+ dev_dbg(&priv->i2c->dev,
+ "%s(): invalid state %d\n",
+ __func__, priv->state);
+ return -EINVAL;
+ }
+
+ /*
+ * Freeze registers: ensure multiple separate register reads
+ * are from the same snapshot
+ */
+ cxd2841er_write_reg(priv, I2C_SLVT, 0x01, 0x01);
+
+ cxd2841er_write_reg(priv, I2C_SLVT, 0x00, 0x40);
+ cxd2841er_read_regs(priv, I2C_SLVT, 0x19, data, 1);
+ qam = (enum sony_dvbc_constellation_t) (data[0] & 0x07);
+ cxd2841er_read_regs(priv, I2C_SLVT, 0x4C, data, 2);
+
+ reg = ((u32)(data[0]&0x1f) << 8) | (u32)data[1];
+ if (reg == 0) {
+ dev_dbg(&priv->i2c->dev,
+ "%s(): reg value out of range\n", __func__);
+ return 0;
+ }
+
+ switch (qam) {
+ case SONY_DVBC_CONSTELLATION_16QAM:
+ case SONY_DVBC_CONSTELLATION_64QAM:
+ case SONY_DVBC_CONSTELLATION_256QAM:
+ /* SNR(dB) = -9.50 * ln(IREG_SNR_ESTIMATE / (24320)) */
+ if (reg < 126)
+ reg = 126;
+ *snr = -95 * (int32_t)sony_log(reg) + 95941;
+ break;
+ case SONY_DVBC_CONSTELLATION_32QAM:
+ case SONY_DVBC_CONSTELLATION_128QAM:
+ /* SNR(dB) = -8.75 * ln(IREG_SNR_ESTIMATE / (20800)) */
+ if (reg < 69)
+ reg = 69;
+ *snr = -88 * (int32_t)sony_log(reg) + 86999;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
}
static int cxd2841er_read_snr_t(struct cxd2841er_priv *priv, u32 *snr)
@@ -1871,23 +1934,29 @@ static void cxd2841er_read_signal_strength(struct dvb_frontend *fe)
static void cxd2841er_read_snr(struct dvb_frontend *fe)
{
u32 tmp = 0;
+ int ret = 0;
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
struct cxd2841er_priv *priv = fe->demodulator_priv;
dev_dbg(&priv->i2c->dev, "%s()\n", __func__);
switch (p->delivery_system) {
+ case SYS_DVBC_ANNEX_A:
+ case SYS_DVBC_ANNEX_B:
+ case SYS_DVBC_ANNEX_C:
+ ret = cxd2841er_read_snr_c(priv, &tmp);
+ break;
case SYS_DVBT:
- cxd2841er_read_snr_t(priv, &tmp);
+ ret = cxd2841er_read_snr_t(priv, &tmp);
break;
case SYS_DVBT2:
- cxd2841er_read_snr_t2(priv, &tmp);
+ ret = cxd2841er_read_snr_t2(priv, &tmp);
break;
case SYS_ISDBT:
- cxd2841er_read_snr_i(priv, &tmp);
+ ret = cxd2841er_read_snr_i(priv, &tmp);
break;
case SYS_DVBS:
case SYS_DVBS2:
- tmp = cxd2841er_dvbs_read_snr(priv, p->delivery_system);
+ ret = cxd2841er_dvbs_read_snr(priv, p->delivery_system, &tmp);
break;
default:
dev_dbg(&priv->i2c->dev, "%s(): unknown delivery system %d\n",
@@ -1896,8 +1965,12 @@ static void cxd2841er_read_snr(struct dvb_frontend *fe)
return;
}
- p->cnr.stat[0].scale = FE_SCALE_DECIBEL;
- p->cnr.stat[0].svalue = tmp;
+ if (!ret) {
+ p->cnr.stat[0].scale = FE_SCALE_DECIBEL;
+ p->cnr.stat[0].svalue = tmp;
+ } else {
+ p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+ }
}
static void cxd2841er_read_ucblocks(struct dvb_frontend *fe)