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Commit 2f1ea29f authored by Antti Palosaari's avatar Antti Palosaari Committed by Mauro Carvalho Chehab
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[media] si2157: implement signal strength stats 



Implement DVBv5 signal strength stats. Returns dBm.

Signed-off-by: default avatarAntti Palosaari <crope@iki.fi>
Tested-by: default avatarAdam Baker <linux@baker-net.org.uk>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
parent d2b72f64

drivers/media/tuners/si2157.c

+39 −1
Original line number Diff line number Diff line
@@ -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;

drivers/media/tuners/si2157_priv.h

+1 −0
Original line number Diff line number Diff line
@@ -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