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media: si2165: add DVBv5 C/N statistics for DVB-C 

Add C/N statistics in dB to read_status (DVBv5).

Signed-off-by: Matthias Schwarzott <zzam@gentoo.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Matthias Schwarzott 2017-11-05 09:25:07 -05:00 committed by Mauro Carvalho Chehab
parent 1e5fde1bc2
commit c0675d0b2a
2 changed files with 42 additions and 2 deletions
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43
drivers/media/dvb-frontends/si2165.c
View File

@ -116,6 +116,17 @@ static int si2165_readreg16(struct si2165_state *state,
return ret;
}
static int si2165_readreg24(struct si2165_state *state,
const u16 reg, u32 *val)
{
u8 buf[3];
int ret = si2165_read(state, reg, buf, 3);
*val = buf[0] | buf[1] << 8 | buf[2] << 16;
dev_dbg(&state->client->dev, "reg read: R(0x%04x)=0x%06x\n", reg, *val);
return ret;
}
static int si2165_writereg8(struct si2165_state *state, const u16 reg, u8 val)
{
return regmap_write(state->regmap, reg, val);
@ -518,6 +529,7 @@ static int si2165_init(struct dvb_frontend *fe)
{
int ret = 0;
struct si2165_state *state = fe->demodulator_priv;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
u8 val;
u8 patch_version = 0x00;
@ -627,6 +639,10 @@ static int si2165_init(struct dvb_frontend *fe)
if (ret < 0)
return ret;
c = &state->fe.dtv_property_cache;
c->cnr.len = 1;
c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
return 0;
error:
return ret;
@ -652,9 +668,10 @@ static int si2165_read_status(struct dvb_frontend *fe, enum fe_status *status)
{
int ret;
u8 u8tmp;
u32 u32tmp;
struct si2165_state *state = fe->demodulator_priv;
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
u32 delsys = p->delivery_system;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
u32 delsys = c->delivery_system;
*status = 0;
@ -699,6 +716,28 @@ static int si2165_read_status(struct dvb_frontend *fe, enum fe_status *status)
*status |= FE_HAS_LOCK;
}
/* CNR */
if (delsys == SYS_DVBC_ANNEX_A && *status & FE_HAS_VITERBI) {
ret = si2165_readreg24(state, REG_C_N, &u32tmp);
if (ret < 0)
return ret;
/*
* svalue =
* 1000 * c_n/dB =
* 1000 * 10 * log10(2^24 / regval) =
* 1000 * 10 * (log10(2^24) - log10(regval)) =
* 1000 * 10 * (intlog10(2^24) - intlog10(regval)) / 2^24
*
* intlog10(x) = log10(x) * 2^24
* intlog10(2^24) = log10(2^24) * 2^24 = 121210686
*/
u32tmp = (1000 * 10 * (121210686 - (u64)intlog10(u32tmp)))
>> 24;
c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
c->cnr.stat[0].svalue = u32tmp;
} else
c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
return 0;
}

1
drivers/media/dvb-frontends/si2165_priv.h
View File

@ -74,6 +74,7 @@ struct si2165_config {
#define REG_KP_LOCK 0x023a
#define REG_UNKNOWN_24C 0x024c
#define REG_CENTRAL_TAP 0x0261
#define REG_C_N 0x026c
#define REG_EQ_AUTO_CONTROL 0x0278
#define REG_UNKNOWN_27C 0x027c
#define REG_START_SYNCHRO 0x02e0