[media] si2157: implement signal strength stats

Implement DVBv5 signal strength stats. Returns dBm.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Tested-by: Adam Baker <linux@baker-net.org.uk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/tuners/si2157.c b/drivers/media/tuners/si2157.c
index cdaf687..a6245ef 100644 (file)
--- a/drivers/media/tuners/si2157.c
+++ b/drivers/media/tuners/si2157.c
@@ -79,6 +79,7 @@ static int si2157_init(struct dvb_frontend *fe)
 {
        struct i2c_client *client = fe->tuner_priv;
        struct si2157_dev *dev = i2c_get_clientdata(client);
+       struct dtv_frontend_properties *c = &fe->dtv_property_cache;
        int ret, len, remaining;
        struct si2157_cmd cmd;
        const struct firmware *fw;
@@ -201,9 +202,14 @@ skip_fw_download:
        dev->fw_loaded = true;
 
 warm:
+       /* init statistics in order signal app which are supported */
+       c->strength.len = 1;
+       c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       /* start statistics polling */
+       schedule_delayed_work(&dev->stat_work, msecs_to_jiffies(1000));
+
        dev->active = true;
        return 0;
-
 err_release_firmware:
        release_firmware(fw);
 err:
@@ -222,6 +228,9 @@ static int si2157_sleep(struct dvb_frontend *fe)
 
        dev->active = false;
 
+       /* stop statistics polling */
+       cancel_delayed_work_sync(&dev->stat_work);
+
        /* standby */
        memcpy(cmd.args, "\x16\x00", 2);
        cmd.wlen = 2;
@@ -360,6 +369,34 @@ static const struct dvb_tuner_ops si2157_ops = {
        .get_if_frequency = si2157_get_if_frequency,
 };
 
+static void si2157_stat_work(struct work_struct *work)
+{
+       struct si2157_dev *dev = container_of(work, struct si2157_dev, stat_work.work);
+       struct dvb_frontend *fe = dev->fe;
+       struct i2c_client *client = fe->tuner_priv;
+       struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+       struct si2157_cmd cmd;
+       int ret;
+
+       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;
+
+       schedule_delayed_work(&dev->stat_work, msecs_to_jiffies(2000));
+       return;
+err:
+       c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       dev_dbg(&client->dev, "failed=%d\n", ret);
+}
+
 static int si2157_probe(struct i2c_client *client,
                const struct i2c_device_id *id)
 {
@@ -384,6 +421,7 @@ static int si2157_probe(struct i2c_client *client,
        dev->chiptype = (u8)id->driver_data;
        dev->if_frequency = 5000000; /* default value of property 0x0706 */
        mutex_init(&dev->i2c_mutex);
+       INIT_DELAYED_WORK(&dev->stat_work, si2157_stat_work);
 
        /* check if the tuner is there */
        cmd.wlen = 0;

diff --git a/drivers/media/tuners/si2157_priv.h b/drivers/media/tuners/si2157_priv.h
index 71a5f8c..ecc463d 100644 (file)
--- a/drivers/media/tuners/si2157_priv.h
+++ b/drivers/media/tuners/si2157_priv.h
@@ -30,6 +30,7 @@ struct si2157_dev {
        u8 chiptype;
        u8 if_port;
        u32 if_frequency;
+       struct delayed_work stat_work;
 };
 
 #define SI2157_CHIPTYPE_SI2157 0