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 requested. 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> Cc: Jonathan Cameron <jic23@xxxxxxxxxx> Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx> --- drivers/iio/adc/ti-ads1015.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/iio/adc/ti-ads1015.c b/drivers/iio/adc/ti-ads1015.c index f32d046..fcfa570 100644 --- a/drivers/iio/adc/ti-ads1015.c +++ b/drivers/iio/adc/ti-ads1015.c @@ -623,6 +623,13 @@ static int ads1015_probe(struct i2c_client *client, dev_err(&client->dev, "iio triggered buffer setup failed\n"); return ret; } + + ret = regmap_update_bits(data->regmap, ADS1015_CFG_REG, + ADS1015_CFG_MOD_MASK, + ADS1015_CONTINUOUS << ADS1015_CFG_MOD_SHIFT); + if (ret) + return ret; + ret = pm_runtime_set_active(&client->dev); if (ret) goto err_buffer_cleanup; -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
