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media: ddbridge/mci: read and report signal strength and SNR 

Implement querying signal statistics from the MCI and report this data
in read_status() as DVBv5 statistics.

Picked up from the upstream dddvb GIT.

Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Daniel Scheller 2018-06-23 11:36:06 -04:00 committed by Mauro Carvalho Chehab
parent 3addf0fa82
commit 3c7d591121
1 changed files with 46 additions and 1 deletions
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47
drivers/media/pci/ddbridge/ddbridge-mci.c
View File

@ -155,6 +155,47 @@ static void release(struct dvb_frontend *fe)
kfree(state);
}
static int get_info(struct dvb_frontend *fe)
{
int stat;
struct mci *state = fe->demodulator_priv;
struct mci_command cmd;
memset(&cmd, 0, sizeof(cmd));
cmd.command = MCI_CMD_GETSIGNALINFO;
cmd.demod = state->demod;
stat = mci_cmd(state, &cmd, &state->signal_info);
return stat;
}
static int get_snr(struct dvb_frontend *fe)
{
struct mci *state = fe->demodulator_priv;
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
p->cnr.len = 1;
p->cnr.stat[0].scale = FE_SCALE_DECIBEL;
p->cnr.stat[0].svalue =
(s64)state->signal_info.dvbs2_signal_info.signal_to_noise
* 10;
return 0;
}
static int get_strength(struct dvb_frontend *fe)
{
struct mci *state = fe->demodulator_priv;
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
s32 str;
str = 100000 -
(state->signal_info.dvbs2_signal_info.channel_power
* 10 + 108750);
p->strength.len = 1;
p->strength.stat[0].scale = FE_SCALE_DECIBEL;
p->strength.stat[0].svalue = str;
return 0;
}
static int read_status(struct dvb_frontend *fe, enum fe_status *status)
{
int stat;
@ -168,10 +209,14 @@ static int read_status(struct dvb_frontend *fe, enum fe_status *status)
if (stat)
return stat;
*status = 0x00;
get_info(fe);
get_strength(fe);
if (res.status == SX8_DEMOD_WAIT_MATYPE)
*status = 0x0f;
if (res.status == SX8_DEMOD_LOCKED)
if (res.status == SX8_DEMOD_LOCKED) {
*status = 0x1f;
get_snr(fe);
}
return stat;
}