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[media] rtl2832: implement sleep 

Put demod to soft reset in order to save power when sleep. That drops
power usage ~30mA @5V on USB dongle I tested. In real life it does
not matter much as USB IF powers off demod too, but now it is done
twice - demod and USB IF.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Antti Palosaari 2014-12-16 14:51:33 -03:00 committed by Mauro Carvalho Chehab
parent 75c24005ee
commit a08c378119
1 changed files with 10 additions and 0 deletions
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10
drivers/media/dvb-frontends/rtl2832.c
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@ -410,13 +410,23 @@ static int rtl2832_sleep(struct dvb_frontend *fe)
{
struct rtl2832_dev *dev = fe->demodulator_priv;
struct i2c_client *client = dev->client;
int ret;
dev_dbg(&client->dev, "\n");
dev->sleeping = true;
/* stop statistics polling */
cancel_delayed_work_sync(&dev->stat_work);
dev->fe_status = 0;
ret = rtl2832_wr_demod_reg(dev, DVBT_SOFT_RST, 0x1);
if (ret)
goto err;
return 0;
err:
dev_dbg(&client->dev, "failed=%d\n", ret);
return ret;
}
static int rtl2832_get_tune_settings(struct dvb_frontend *fe,