[PATCH 4.12 12/43] iio: adc: ti-ads1015: enable conversion when CONFIG_PM is not set

From: Greg Kroah-Hartman
Date: Fri Sep 08 2017 - 09:43:26 EST

4.12-stable review patch. If anyone has any objections, please let me know.


From: Akinobu Mita <akinobu.mita@xxxxxxxxx>

commit e8245c68350104b6022b6783719e843d69ea7c43 upstream.

The ADS1015 device have two operating modes, continuous conversion mode
and single-shot mode. This driver assumes that the continuous conversion
mode is selected by runtime resume callback when the ADC result is

If CONFIG_PM is disabled, the device is always in the default single-shot
mode and no one begins a single conversion. So the conversion register
doesn't contain valid ADC result. Fix it by changing the continuous mode
in probe function.

Cc: Daniel Baluta <daniel.baluta@xxxxxxxxx>
Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/iio/adc/ti-ads1015.c | 7 +++++++
1 file changed, 7 insertions(+)

--- a/drivers/iio/adc/ti-ads1015.c
+++ b/drivers/iio/adc/ti-ads1015.c
@@ -623,6 +623,13 @@ static int ads1015_probe(struct i2c_clie
dev_err(&client->dev, "iio triggered buffer setup failed\n");
return ret;
+ ret = regmap_update_bits(data->regmap, ADS1015_CFG_REG,
+ if (ret)
+ return ret;
ret = pm_runtime_set_active(&client->dev);
if (ret)
goto err_buffer_cleanup;