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[media] si2157: implement signal strength stats

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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>
This commit is contained in:
Antti Palosaari 2014-09-07 11:20:34 -03:00 committed by Mauro Carvalho Chehab
parent d2b72f6482
commit 2f1ea29fca
2 changed files with 40 additions and 1 deletions
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40
drivers/media/tuners/si2157.c
View File

@ -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 @@ static int si2157_init(struct dvb_frontend *fe)
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;

1
drivers/media/tuners/si2157_priv.h
View File

@ -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