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media: si2157: add on-demand rf strength func

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Add get_rf_strength callback to get RSSI from the tuner. DVBv5
stat cache is updated. get_rf_strength is called by tuner_core
for analog tuners and is also used by some bridge drivers to
obtain RSSI directly from the tuner.

Signed-off-by: Brad Love <brad@nextdimension.cc>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Brad Love 2019-11-14 21:04:06 +01:00 committed by Mauro Carvalho Chehab
parent 3c1ccbad80
commit d99846cb1c
1 changed files with 39 additions and 1 deletions
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40
drivers/media/tuners/si2157.c
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@ -726,6 +726,42 @@ static int si2157_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
return 0;
}
static int si2157_get_rf_strength(struct dvb_frontend *fe, u16 *rssi)
{
struct i2c_client *client = fe->tuner_priv;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
struct si2157_cmd cmd;
int ret;
int strength;
dev_dbg(&client->dev, "\n");
memcpy(cmd.args, "\x42\x00", 2);
cmd.wlen = 2;
cmd.rlen = 12;
ret = si2157_cmd_execute(client, &cmd);
if (ret)
goto err;
c->strength.stat[0].scale = FE_SCALE_DECIBEL;
c->strength.stat[0].svalue = (s8)cmd.args[3] * 1000;
/* normalize values based on Silicon Labs reference
* add 100, then anything > 80 is 100% signal
*/
strength = (s8)cmd.args[3] + 100;
strength = clamp_val(strength, 0, 80);
*rssi = (u16)(strength * 0xffff / 80);
dev_dbg(&client->dev, "strength=%d rssi=%u\n",
(s8)cmd.args[3], *rssi);
return 0;
err:
dev_dbg(&client->dev, "failed=%d\n", ret);
return ret;
}
static const struct dvb_tuner_ops si2157_ops = {
.info = {
.name = "Silicon Labs Si2141/Si2146/2147/2148/2157/2158",
@ -739,7 +775,9 @@ static const struct dvb_tuner_ops si2157_ops = {
.set_analog_params = si2157_set_analog_params,
.get_frequency = si2157_get_frequency,
.get_bandwidth = si2157_get_bandwidth,
.get_if_frequency = si2157_get_if_frequency,
.get_if_frequency = si2157_get_if_frequency,
.get_rf_strength = si2157_get_rf_strength,
};
static void si2157_stat_work(struct work_struct *work)