[PATCH 1/3] mn88472: implement signal strength statistics

[Antti Palosaari]

Implement DVBv5 signal strength on relative scale.

Signed-off-by: Antti Palosaari <cr...@iki.fi>
---
 drivers/media/dvb-frontends/mn88472.c | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/drivers/media/dvb-frontends/mn88472.c 
b/drivers/media/dvb-frontends/mn88472.c
index 29dd13b..25dd742 100644
--- a/drivers/media/dvb-frontends/mn88472.c
+++ b/drivers/media/dvb-frontends/mn88472.c
@@ -28,8 +28,9 @@ static int mn88472_read_status(struct dvb_frontend *fe, enum 
fe_status *status)
        struct i2c_client *client = fe->demodulator_priv;
        struct mn88472_dev *dev = i2c_get_clientdata(client);
        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
-       int ret;
-       unsigned int utmp;
+       int ret, i;
+       unsigned int utmp, utmp1;
+       u8 buf[2];
 
        if (!dev->active) {
                ret = -EAGAIN;
@@ -77,6 +78,24 @@ static int mn88472_read_status(struct dvb_frontend *fe, enum 
fe_status *status)
                goto err;
        }
 
+       /* Signal strength */
+       if (*status & FE_HAS_SIGNAL) {
+               for (i = 0; i < 2; i++) {
+                       ret = regmap_bulk_read(dev->regmap[2], 0x8e + i,
+                                              &buf[i], 1);
+                       if (ret)
+                               goto err;
+               }
+
+               utmp1 = buf[0] << 8 | buf[1] << 0 | buf[0] >> 2;
+               dev_dbg(&client->dev, "strength=%u\n", utmp1);
+
+               c->strength.stat[0].scale = FE_SCALE_RELATIVE;
+               c->strength.stat[0].uvalue = utmp1;
+       } else {
+               c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       }
+
        return 0;
 err:
        dev_dbg(&client->dev, "failed=%d\n", ret);
@@ -462,6 +481,7 @@ static int mn88472_probe(struct i2c_client *client,
 {
        struct mn88472_config *pdata = client->dev.platform_data;
        struct mn88472_dev *dev;
+       struct dtv_frontend_properties *c;
        int ret;
        unsigned int utmp;
        static const struct regmap_config regmap_config = {
@@ -547,6 +567,10 @@ static int mn88472_probe(struct i2c_client *client,
        *pdata->fe = &dev->fe;
        i2c_set_clientdata(client, dev);
 
+       /* Init stats to indicate which stats are supported */
+       c = &dev->fe.dtv_property_cache;
+       c->strength.len = 1;
+
        /* Setup callbacks */
        pdata->get_dvb_frontend = mn88472_get_dvb_frontend;
 
-- 
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