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[media] ts2020: Provide DVBv5 API signal strength 

Provide a DVBv5 API signal strength.  This is in units of 0.001 dBm rather
than a percentage.

>From Antti Palosaari's testing with a signal generator, it appears that the
gain calculated according to Montage's specification if negated is a
reasonable representation of the signal strength of the generator.

To this end:

 (1) Polled statistic gathering needed to be implemented in the TS2020 driver.
     This is done in the ts2020_stat_work() function.

 (2) The calculated gain is placed as the signal strength in the
     dtv_property_cache associated with the front end with the scale set to
     FE_SCALE_DECIBEL.

 (3) The DVBv3 format signal strength then needed to be calculated from the
     signal strength stored in the dtv_property_cache rather than accessing
     the value when ts2020_read_signal_strength() is called.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
David Howells 2015-05-26 12:04:07 -03:00 committed by Mauro Carvalho Chehab
parent 0f91c9d6ba
commit 3366cd5d72
1 changed files with 53 additions and 9 deletions
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62
drivers/media/dvb-frontends/ts2020.c
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@ -32,10 +32,11 @@ struct ts2020_priv {
struct regmap_config regmap_config;
struct regmap *regmap;
struct dvb_frontend *fe;
struct delayed_work stat_work;
int (*get_agc_pwm)(struct dvb_frontend *fe, u8 *_agc_pwm);
/* i2c details */
int i2c_address;
struct i2c_adapter *i2c;
int i2c_address;
u8 clk_out:2;
u8 clk_out_div:5;
u32 frequency_div; /* LO output divider switch frequency */
@ -65,6 +66,7 @@ static int ts2020_release(struct dvb_frontend *fe)
static int ts2020_sleep(struct dvb_frontend *fe)
{
struct ts2020_priv *priv = fe->tuner_priv;
int ret;
u8 u8tmp;
if (priv->tuner == TS2020_M88TS2020)
@ -72,11 +74,18 @@ static int ts2020_sleep(struct dvb_frontend *fe)
else
u8tmp = 0x00;
return regmap_write(priv->regmap, u8tmp, 0x00);
ret = regmap_write(priv->regmap, u8tmp, 0x00);
if (ret < 0)
return ret;
/* stop statistics polling */
cancel_delayed_work_sync(&priv->stat_work);
return 0;
}
static int ts2020_init(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
struct ts2020_priv *priv = fe->tuner_priv;
int i;
u8 u8tmp;
@ -138,6 +147,13 @@ static int ts2020_init(struct dvb_frontend *fe)
reg_vals[i].val);
}
/* Initialise v5 stats here */
c->strength.len = 1;
c->strength.stat[0].scale = FE_SCALE_DECIBEL;
c->strength.stat[0].uvalue = 0;
/* Start statistics polling */
schedule_delayed_work(&priv->stat_work, 0);
return 0;
}
@ -410,20 +426,47 @@ static int ts2020_get_tuner_gain(struct dvb_frontend *fe, __s64 *_gain)
return ts2020_read_tuner_gain(fe, v_agc, _gain);
}
/*
* Gather statistics on a regular basis
*/
static void ts2020_stat_work(struct work_struct *work)
{
struct ts2020_priv *priv = container_of(work, struct ts2020_priv,
stat_work.work);
struct i2c_client *client = priv->client;
struct dtv_frontend_properties *c = &priv->fe->dtv_property_cache;
int ret;
dev_dbg(&client->dev, "\n");
ret = ts2020_get_tuner_gain(priv->fe, &c->strength.stat[0].svalue);
if (ret < 0)
goto err;
c->strength.stat[0].scale = FE_SCALE_DECIBEL;
schedule_delayed_work(&priv->stat_work, msecs_to_jiffies(2000));
return;
err:
dev_dbg(&client->dev, "failed=%d\n", ret);
}
/*
* Read TS2020 signal strength in v3 format.
*/
static int ts2020_read_signal_strength(struct dvb_frontend *fe,
u16 *signal_strength)
u16 *_signal_strength)
{
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
unsigned strength;
__s64 gain;
int ret;
/* Determine the total gain of the tuner */
ret = ts2020_get_tuner_gain(fe, &gain);
if (ret < 0)
return ret;
if (c->strength.stat[0].scale == FE_SCALE_NOT_AVAILABLE) {
*_signal_strength = 0;
return 0;
}
gain = c->strength.stat[0].svalue;
/* Calculate the signal strength based on the total gain of the tuner */
if (gain < -85000)
@ -439,7 +482,7 @@ static int ts2020_read_signal_strength(struct dvb_frontend *fe,
/* 90% - 99%: strong signal */
strength = 90 + (45000 + gain) / 5000;
*signal_strength = strength * 65535 / 100;
*_signal_strength = strength * 65535 / 100;
return 0;
}
@ -546,6 +589,7 @@ static int ts2020_probe(struct i2c_client *client,
dev->get_agc_pwm = pdata->get_agc_pwm;
fe->tuner_priv = dev;
dev->client = client;
INIT_DELAYED_WORK(&dev->stat_work, ts2020_stat_work);
/* check if the tuner is there */
ret = regmap_read(dev->regmap, 0x00, &utmp);